| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 388 | Electricity: motor control systems | 89 |
| 388800000 | CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR | 71 |
| 20090097830 | MOTOR DRIVE DEVICE PROVIDED WITH DISTURBANCE LOAD TORQUE OBSERVER - A motor drive device ( | 04-16-2009 |
| 20090175601 | MOTOR CONTROLLER AND MOTOR CONTROL METHOD - A motor controller calculates a motor torque command based on motor speed and causes a motor to generate a torque corresponding to the motor torque command, to drive a machine load coupled to the motor. The motor controller includes a speed compensator that makes, when a speed compensation torque is calculated based on the motor speed, frequency characteristics of the speed compensation torque for the motor speed exhibit a low frequency cutoff characteristic so that steady-state gain in frequency response is less than a maximum gain value. A torque adder generates a motor torque command by adding to the existing motor torque command an externally input feedforward torque signal and the speed compensation torque. | 07-09-2009 |
| 20090304368 | COMMUTATOR MOTOR COMPRISING A DEVICE FOR CONTROLLING THE ANGULAR POSITION AND ROTATIONAL SPEED OF THE ARMATURE THEREOF - An electric commutator motor comprising a housing and a shaft which is solidly connected to a rotor. The housing comprises a stator and supply brushes which can be connected to an electric power source. The rotor is solidly connected to a commutator with bars, and comprises a set of wound turns, the ends of which are connected to two successive bars of the commutator. The housing comprises at least one additional brush which is positioned close to at least one of the supply brushes, known as the monitor brush, at a distance less than the width of a bar. The additional brush and the monitor brush are of the same thickness and are disposed symmetrically in relation to a diametrical plane of the rotor. The additional brush is connected electrically to a means for counting the pulses generated directly on the additional brush when the monitor brush leaves a bar of the commutator. | 12-10-2009 |
| 20090304369 | DRIVE AND EVALUATION UNIT - The invention relates to a drive and evaluation unit for displacing an object to be displaced, particularly for raising and lowering a side window in a motor vehicle. The drive includes a commutator motor with a stator having two diametrically opposed permanent magnets. The magnets have cross-sectional shapes of a respective peripheral contour segment, having a radial inner peripheral contour segment which encompasses an armature over a respective inner peripheral angle. The armature is provided with ten grooves spaced around its periphery for holding armature windings that are configured as lap windings. The evaluation unit includes a device for determining the rotational position of the armature by evaluating the ripple count of the armature current. According to the invention, the armature windings are configured as short pitch windings, and the inner peripheral angle of the radial inner peripheral contour segment of at least one of the magnets is between 101° and 111°. | 12-10-2009 |
| 20100014843 | FAN CONTROLLING CIRCUIT - A fan controlling circuit for detecting rotational speed of a fan, includes a comparison circuit and a controlling chipset. The comparison circuit receives a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, and outputs a filtered rotational speed signal at an output terminal. The controlling chipset receives the filtered rotational speed signal, and outputs control signals to control the rotational speed of the fan. | 01-21-2010 |
| 20110158614 | MOTOR ROTATION SPEED CONTROL DEVICE AND METHOD THEREOF - A motor rotational speed control device for controlling a direct current (DC) brush motor is provided, which includes a motor driver, a detection unit and a central processing unit (CPU). The motor driver is coupled to a first control terminal and a second control terminal of the DC brush motor. The detection unit detects a back electromotive force (EMF) of the DC brush motor through the first control terminal and the second control terminal when the motor driver is set to a disable state, and accordingly generates back EMF information. The CPU determines whether the direct current brush motor has stopped rotating according to the back EMF information, and determines whether to generate a brake control signal according to a determination result. The motor driver reduces a rotation speed of the DC brush motor according to the brake control signal when the motor driver is set to an enable state. | 06-30-2011 |
| 20110274415 | Method for ascertaining measured values in a cyclically controlled system - A method for ascertaining measured values in a cyclically controlled system, the cyclic control having control time periods in which the system is controlled, and no-control time periods in which the system is not controlled, having the following operations of determining first integration time periods as a function of the cyclic control, the first integration time periods being situated within at least one of the control time periods, and/or determining second integration time periods as a function of the cyclic control, the second integration time period being situated within at least one of the no-control time periods; detecting one of the measured variables of the system dependent on the control; ascertaining summation and/or integration values by summation and/or integration of the measured variable during the first and/or second integration time periods; ascertaining the measured value for at least one of the control time periods and/or no-control time periods on the basis of time data of the first and/or second integration time periods and of the ascertained summation and/or integration values. | 11-10-2011 |
| 388801000 | Field control, or field and armature control, by digital or combined analog and digital circuitry | 1 |
| 20100254685 | CONTROL SYSTEM FOR AN ELECTRIC MACHINE - A control system for an electric machine, the control system including a position sensor and a drive controller. The drive controller generates one or more control signals for use in exciting a winding of the electric machine. Control signals for each electrical half-cycle of one mechanical cycle are generated by the drive controller in response to a single edge of a signal output by the position-sensor. | 10-07-2010 |
| 388803000 | Field control, or field and armature control, by analog (only) circuitry | 7 |
| 20090190903 | MOTOR CONTROLLER AND VEHICULAR STEERING SYSTEM USING SAID MOTOR CONTROLLER - A low speed region position estimating portion is designed to be suitable for when the motor is operating in a low speed region, and estimates a low speed estimated rotational position θ̂ | 07-30-2009 |
| 388805000 | By phase or frequency modification | 1 |
| 20110033173 | Control Electronics for Brushless Motors - An electronic control circuit for a brushless motor has an input power circuit providing a DC voltage and a microcontroller integrated circuit receiving the DC voltage. The microcontroller integrated circuit provides three-phase control signals according to a space vector control method. A microprocessor connected to the microcontroller integrated circuit executes supervisory control over the electronic control circuit. An inverter circuit receives the three-phase control signals from the microcontroller integrated circuit and provides driving signals to the brushless motor based on the three-phase control signals received from the microcontroller integrated circuit. | 02-10-2011 |
| 388806000 | By voltage or current modification | 5 |
| 20080260361 | METHOD AND APPARATUS FOR ACTIVE NOISE REDUCTION IN FANS - The present invention provides a method and apparatus for providing power to a fan motor. One embodiment of the apparatus includes a boost regulator configured to provide an output current to a fan motor using an input current provided at an input voltage by a power supply. The fan motor is configured to draw the output current at a first frequency and the input current is constant within a first selected tolerance over a time scale longer than indicated by the first frequency. | 10-23-2008 |
| 20090136220 | METHOD OF TRANSITION BETWEEN CONTROLS FOR A VENTILATION SYSTEM - A method of constant airflow control for a ventilation system is disclosed. The method includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. This is because these controls use only intrinsic control variables which are electric current and rotational speed of the motor. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor's current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition. Also disclosed is an apparatus for conducting these control methods. | 05-28-2009 |
| 20090257740 | Switching Regulation Circuit and Dual-Winding Motor Apparatus - A switching regulation circuit for a dual-winding motor apparatus is provided. The switching regulation circuit comprises a gate-controlled device and a driving circuit. When one of the two windings generates an induced voltage signal greater than a threshold value, the driving circuit generates an output signal for turning on the gate-controlled transistor. Thereby, a parasitic diode of the gate-controlled device will not be turned on and damage the entire circuit. | 10-15-2009 |
| 20110033174 | CONTROL CIRCUIT FOR A VARIABLE FREQUENCY DC MOTOR - The present invention discloses a control circuit for a variable frequency DC motor, the control circuit comprising: a controller, having a voltage sensing input end and a control output end, wherein the control output end is used to deliver an output signal according to the difference between a threshold voltage and the voltage at the voltage sensing input end; a transistor, having a first terminal, a second terminal and a third terminal, wherein the first terminal is coupled to the voltage sensing input end, and the second terminal is coupled to the variable frequency DC motor, and the third terminal is coupled to a reference ground; and a voltage divider, coupled between the second terminal and the third terminal, used to generate a feedback voltage for the voltage sensing input end; wherein the voltage at the second terminal is regulated according to the threshold voltage. | 02-10-2011 |
| 388807000 | With variable impedance | 1 |
| 20080260362 | METHOD AND SYSTEM FOR OPERATING A MOTOR TO AVOID SELECTED PULSE RATIO VALUES - A method and system for operating a motor are provided. Power is provided to the motor through at least one switch operating at a first switching frequency. A pulse ratio of the motor is calculated based on the first switching frequency. The at least one switch is operated at a second switching frequency if the calculated pulse ratio is less than a first pulse ratio value and greater than a second pulse ratio value. | 10-23-2008 |
| 388809000 | Armature control by digital or combined analog and digital circuitry | 47 |
| 20090162038 | MOTOR CHARACTERISTICS ACQUIRING APPARATUS, CONTROL APPARATUS USING THE ACQUIRED MOTOR CHARACTERISTICS, AND POWER WINDOW CONTROL APPARATUS - The rotation period of a motor is subdivided by edge interval times and a rate of change between a currently calculated edge interval time and an edge interval time calculated one rotation of the motor previously is calculated at the detection of each edge. Then the rotation period of the motor is calculated by multiplying a set reference period by the calculated rate of change. | 06-25-2009 |
| 20100027978 | VOLTAGE REGULATED DC SUPPLY CIRCUIT FOR A WIRE FEED DRIVE SYSTEM - Systems and methods relating to a boosting rectifier and feeder motor drive circuit are provided. The circuit may be used to produce a regulated DC supply voltage from a variable input AC line voltage, chop the DC supply voltage and deliver a pulse width modulated motor voltage to a wire feed motor in the wire drive assembly. One embodiment relates to elimination of undesirable wire feeder inconsistencies due to motor loading conditions, distance between the primary power source and the wire feeder, and so forth. In certain embodiments, the circuit may contain power factor correction circuitry, which may reduce the size of circuit components due to increased efficiency. Current paths through the circuit during the positive and negative half cycles of the AC input voltage are provided. Exemplary controller logic that may be used to control the operation of the boosting rectifier and feeder motor drive circuit is provided. | 02-04-2010 |
| 20100142932 | DIRECT CURRENT MOTOR CONTROLLING APPARATUS AND METHOD THEREOF - A direct current motor controlling apparatus may include a direct current motor driving unit to apply a driving voltage to a direct current motor and detect a predetermined signal from the direct current motor, and a servo-micom to control the status of the direct current motor using the signal detected by the direct current motor driving unit. Accordingly, the rotational status of the direct current motor is checked to control the direct current motor. | 06-10-2010 |
| 20110286723 | DC motor assembly with step adjusting control arrangement - A DC motor assembly includes a motorized unit for generating a rotatable power at an output shaft, and a step adjusting control arrangement including an optical grating and a photocoupler. The optical grating, which is operatively coupled at the output shaft, has a plurality of light transmissible portions and a plurality of light blocking portions alternating with the light transmissible portions. The photocoupler is activated to send out an impulse signal in responsive to a phase shift between the light transmissible portion and the light blocking portion of the optical grating, wherein the output shaft is controllably driven to be rotated and stopped in a sequent manner as a stepping movement thereof in responsive to the impulse signal so as to controllably adjust the rotational speed of the output shaft. | 11-24-2011 |
| 20130202275 | Method for Calibrating a Drive Motor for a Toner Metering Device in an Imaging Apparatus - In an imaging apparatus having a toner container, a method of periodically calibrating a back EMF constant Ke used in a speed control circuit of a DC motor used for driving for a toner metering device. To adjust the value of the back EMF constant Ke, the method uses a plurality of sampled back EMF measurements together with a calculated actual speed of rotation of the toner metering device as measured using motion sensor. | 08-08-2013 |
| 20130209074 | CONTROL SYSTEM FOR A STRAIGHT SLOT DIRECT CURRENT MOTOR ACTUATOR - A control system for an actuator including a straight slot direct current motor comprises a position sensor for measuring the angular position (θ) of the motor and a current sensor for measuring the current strength (Im) in the motor, but not having a sensor for measuring the angular rotation speed of the motor. | 08-15-2013 |
| 388811000 | By pulse width or duty cycle modification | 34 |
| 20080219648 | CIRCUIT AND METHOD FOR CONTROLLING THE ROTATING SPEED OF A BLDC MOTOR - A circuit and a method for controlling the rotating speed of a brushless direct current (BLDC) motor are provided, whose goal is solving the stall problem encountered by conventional BLDC motors driven by pulse width modulation (PWM). The circuit includes a closed-loop control mechanism for adjusting the duty cycle of the motor current of the BLDC motor, thus controlling the rotating speed of the motor. The closed-loop control is based on the comparison of a signal proportional to the actual rotating speed and another signal proportional to the predetermined target rotating speed. | 09-11-2008 |
| 20080219649 | MOTOR DRIVE DEVICE AND ELECTRIC APPARATUS USING THE SAME - A motor drive device of the present invention includes: an output circuit provided with a switch element connected to a motor; a PWM signal generating circuit for generating a PWM signal having a duty corresponding to a ratio between a power supply voltage applied to the motor and a predetermined control voltage; a control circuit for performing on/off control of the switch element according to the PWM signal; and a control voltage generating circuit for generating the control voltage such that the back electromotive voltage of the motor is maintained at a desired value. | 09-11-2008 |
| 20080226266 | Control Apparatus for and Control Method of Controlling Motor for Vehicle - The present invention is aimed at provision of a control apparatus for and a control method of controlling a motor for a vehicle driven by a driving circuit that operates according to a pulse width modulation (PWM) signal. Measurement of a duty of an output signal from the driving circuit is executed, and a difference between the measured duty and a target duty in a PWM control is then obtained to further execute setting of a correction value for correcting the target duty based on the above difference and to generate the PWM signal based on the corrected target duty. | 09-18-2008 |
| 20080240688 | Fan controller with duty cycle comparator - A control circuit for a direct current motor is described. In accordance with the principles of the invention, a duty cycle comparator is provided to control the speed of the motor. | 10-02-2008 |
| 20080247734 | MOTOR DRIVING CIRCUIT - A motor driving circuit drives a motor on receipt of an error signal having a digital value corresponding to a deviation between a current rotation speed of the motor, which is the subject to be driven, and its target value. A digital filter eliminates a high-frequency component of the error signal. A driving unit controls an electric current flowing through the motor in accordance with the digital value of the error signal from which the high-frequency component is eliminated by the digital filter. An upper-limit value setting unit sets an upper limit value to the digital value of the error signal input to the digital filter. The upper-limit value setting unit is configured to be capable of changing the upper limit value in accordance with a setting signal from the outside. | 10-09-2008 |
| 20080253750 | PROTECT-CONTROL DEVICE CAPABLE OF LIMITING CURRENT FOR REDUCING NOISE RESULTLING FROM SWITCHOVER OF MOTOR - A protect-control device capable of limiting current for reducing noise resulting from switchover of a motor includes a motor coil set, a driving unit, a sensing unit and a control unit. The motor coil set constituting a motor. The driving unit is electrically connected to the motor coil and provides a driving level to pass through the motor coil for driving the motor. The sensing unit is electrically connected to the motor coil set, provides a preset reference level, detects the driving level, compares the driving level to the preset reference level and outputs identifying signal. The control signal is electrically connected to the driving unit, the sensing unit and a Hall component, adjusts the driving level based on the identifying signal for driving unit output maintaining a basic duty cycle. | 10-16-2008 |
| 20080253751 | METHOD AND APPARATUS FOR CONTROLLING ROTATIONAL SPEED OF FAN - An apparatus for controlling rotational speed of a fan includes a sensor module, a single chip microcomputer (SCM) module, and a driving module. The sensor module collects rotational speed signals of a fan, and converts the rotational speed signals to voltage signals. The SCM module receives the voltage signals from the sensor module and compares the voltage signals with a predetermined rotational speed value stored in the SCM module, and outputs a control signal according to the comparison. The driving module receives the control signal from the SCM module, and outputs a pulse width modulation (PWM) signal to control the rotational speed of the fan. | 10-16-2008 |
| 20080260363 | Method of Controlling a Motorized Window Treatment - A method of controlling a motorized window treatment provides for continued operation of the motorized window treatment during an overload or low-line condition. The motorized window treatment is driven by an electronic drive unit having a motor, a motor drive circuit, and a controller. The controller controls the motor drive circuit to drive the motor with a pulse-width modulated signal generated from a bus voltage. The controller is operable to monitor the magnitude of the bus voltage. If the bus voltage drops below a first voltage threshold, the controller stops the motor or reduces the duty cycle of the pulse-width modulated signal to allow the bus voltage to increase to an acceptable magnitude. When the bus voltage rises above a second voltage threshold, the controller begins driving the motor normally once again. During an overload or low-line condition, the controller is prevented from resetting, while driving the motor with minimal interruption to the movement of the motorized window treatment. | 10-23-2008 |
| 20080273865 | Noise suppresion suppression for hall sensor arrangements - A method and apparatus is provided for processing signals from a Hall effect device arrangement coupled to a monolithic brushless DC motor where the motor is driven by a PWM circuit providing PWM drive signals. | 11-06-2008 |
| 20080292290 | MOTOR CONTROL METHOD AND APPARATUS THEREOF - A motor controlling method and apparatus thereof are provided. The control method includes the steps of receiving a switching phase signal of coil while the motor is rotating, for generating a separate signal, comparing the phase signal and the separate signal to generate a first control signal, generating a current feedback signal equivalent to the first control signal, and comparing the current feedback signal and the separate signal for generating a second control signal so as to control the operation of the motor. | 11-27-2008 |
| 20080292291 | MOTOR CONTROL METHOD AND DEVICE THEREOF - A motor control method and a motor control device are provided. The control method includes the steps of receiving a current feedback signal from a coil switching circuit, while the motor is rotating, for generating a separate signal, and comparing the current feedback signal and the separate signal for generating a motor control signal so as to control the operation of the motor. | 11-27-2008 |
| 20080298784 | Method of Sensing Speed of Electric Motors and Generators - A method and circuit for determining the speed and/or counting the revolutions of brush and commutator motors is described. The method and circuitry detects signals present on the windings of the motor due to commutation that occurs at the brushes and commutator of the motor. This method can be used to simply monitor & indicate the motor speed and revolutions or to form the basis of a motor control. | 12-04-2008 |
| 20080304815 | Brushless motor control circuit assembly for ceiling fan - A power-saving, high-performance, low-noise brushless motor control circuit assembly is disclosed formed of a power supply circuit, a booster and compensation circuit, a voltage regulator circuit, a microprocessor, a back electromagnetic force sensor, three driver circuits, and three output circuits. By means of detecting back electromagnetic force, the magnetic pole position of the brushless motor is known accurately, ensuring accurate operation control. By means of providing a high voltage to drive the drive circuits, the field effect transistors of the output circuits are operated under full conduction, saving much power consumption and lowering the working temperature of the brushless motor. | 12-11-2008 |
| 20080317444 | Motor driving device - A driving device is provided for controlling rotation of a motor. The driving device comprises an inputting module, a comparing module and a processing module. The inputting module includes a first current source, a first voltage source and a first capacitance. The first capacitance is coupled between the first current source and the first voltage source for charging/discharging and generating a voltage signal. The comparing module is coupled to the inputting module for comparing a selecting signal with the voltage signal and generating a comparing signal. The processing module is coupled to the comparing module and generates a control signal according to a clock signal and the comparing signal, wherein the driving device controls the rotation of the motor by the control signal. | 12-25-2008 |
| 20080317445 | Motor Speed Control Circuit - A motor speed control circuit includes: a voltage generating circuit configured to output a reference voltage corresponding to a target rotation speed of a motor and a speed voltage corresponding to a rotation speed of the motor, and change either the reference voltage or the speed voltage according to a temperature; a comparison circuit configured to compare the speed voltage with the reference voltage; and a driving circuit configured to drive the motor so as to match a level of the speed voltage to a level of the reference voltage, based on a comparison result from the comparison circuit. | 12-25-2008 |
| 20090003806 | Method and circuit for controlling rotation speed of computer fan - An exemplary method for controlling rotation speed of a computer fan includes: judging the type of a fan by comparing two rotation speeds detected before and after changing a duty cycle of a PWM signal respectively; controlling the computer fan as a 4-pin fan the PWM signals if the rotation speeds are different; and controlling the computer fan as a 3-pin fan via voltage signals converted from the PWM signals if the rotation speeds are equal. And an exemplary circuit for controlling rotation speed of a computer fan is capable of controlling rotation speed of the 4-pin fan via PWM signals, and controlling rotation peed of the 3-pin fan via voltage signals converted from PWM signals. | 01-01-2009 |
| 20090034943 | Control circuit for fan operating - A control circuit for fan operating comprises a drive operating circuit, a potential modulating circuit, a comparator and a switch circuit. The drive operating circuit at least has a voltage source, a drive IC, a Hall IC and a motor coil winding, the drive IC is connected with the voltage source, and the Hall IC and the motor coil winding are connected with the drive IC. The potential modulating circuit is connected with the drive IC of the drive operating circuit and has a modulating signal source to provide a PWM signal with a duty cycle. The comparator has an input end and an output end, the input end is connected with the potential modulating circuit, and potential state of the output end is determined in accordance with the duty cycle of the PWM signal. The switch circuit is connected with the drive IC of the drive operating circuit and the output end of the comparator, and operating state of the drive IC of the drive operating circuit is determined in accordance with potential state of the output end. | 02-05-2009 |
| 20090041440 | Document reading apparatus, document reading method, and program for reading document - The invention provides, as an aspect thereof, an document reading apparatus that includes: a speed calculating unit that calculates a speed related to the rotation of a motor on the basis of a signal that is outputted from an encoder; and a controlling unit that calculates control amount on the basis of the speed calculated by the speed calculating unit so as to control the rotation of the motor in accordance with the calculated control amount. In the configuration of an document reading apparatus according to this aspect of the invention, the above-mentioned controlling unit controls the motor with an increase in the control amount in a case where there occurs no change in the signal that is outputted from the encoder for a certain period of time. The increase in the control amount is based on the length of time that has elapsed since the last change in the signal. | 02-12-2009 |
| 20090047005 | DRIVING APPARATUS FOR A CEILING FAN - A driving apparatus for a DC brushless motor of a ceiling fan is provided. By setting at least one coder and one sensor outside the DC brushless motor, the driving apparatus can sense the position of magnetic poles of the motor for driving the motor. Meanwhile, a controller set with the motor stores the rotation speed of the motor before being turned off by detecting the turn-off time of a turn-on/off signal. | 02-19-2009 |
| 20090060477 | FOOD WASTE DISPOSER WITH PWM BASED CONTROL OF GRINDING PROFILE - A food waste disposer has a motor driven with pulse width modulation (“PWM”). A grinding profile is controlled based on PWM values of the PWM controller driving the motor. In an aspect, controlling the grinding profile includes varying the speed of the motor based on the PWM values. In an aspect, the grinding profile is initiated after the food waste disposer is started and a PWM value exceeds a set value indicating the presence of a grinding load in a grinding section of the food waste disposer. In an aspect, it is determined that the grinding load has been sufficiently ground once the PWM value does not exceed a first set value after the grinding profile has been initiated. In an aspect, corrective action is initiated when the PWM value exceeds the set value after a predetermined period of time. | 03-05-2009 |
| 20090116823 | FAN SPEED CONTROL DEVICE - A fan speed control device includes a management selection module, a first and a second buffers, a resistor, a transistor, and a switch. Depending upon whether a motherboard supports a system of a baseboard management control or not, the fan speed control device selectively uses an indicative signal of a serial input and output interface or an indicative signal of the baseboard management control to indicate a power-on status. At the power-on moment, the fan speed control device controls the fan to operate at its minimum speed, so that a system crash due to a power output shortage of a power supply can be avoided. As the system enters stable operation, the fan speed is controlled by a pulse width modulation signal. | 05-07-2009 |
| 20090129760 | Method and device for controlling a heat-dissipating fan for an electronic component - A method for controlling a heat-dissipating fan for an electronic component includes the steps of: detecting a temperature of the electronic component, and outputting a first control signal corresponding to the temperature thus detected; receiving a load current of the electronic component, and converting the load current into a second control signal; and controlling a rotating speed of the heat-dissipating fan with reference to the first control signal and the second control signal. A device employing the method includes a current detecting module adapted for detecting a load current, a temperature control circuit adapted for detecting a temperature, and a logic circuit unit coupled to the current detecting module and the temperature control circuit and controlling a rotating speed of a heat-dissipating fan. | 05-21-2009 |
| 20090154905 | Single Output H-Bridge Drive - Disclosed is a drive circuit for generating the drive current used to energize the windings of a motor. The drive circuit includes a data processing unit that produces two outputs used to control an H-bridge and generation of the drive current. One output, a commutation signal, controls the timing of generation of drive current. The drive current in turn is determined based on the other output, a speed signal. The speed signal waveform includes blanking portions to avoid occurrences of shoot through in the H-bridge. | 06-18-2009 |
| 20090162039 | CIRCUIT FOR CONTROLLING ROTATION SPEED OF COMPUTER FAN - A circuit for controlling rotation speed of a computer fan includes a fan connector providing for controlling the rotation speed of the computer fan, a rotation speed detector providing for detecting the rotation speed of the computer fan, a BIOS chip connected to the fan connector via the rotation speed detector and provided for receiving, and comparing rotation speed signals from the rotation speed detector, a super I/O chip connected to the BIOS chip and provided for outputting either a PWM signal or another PWM signal to be converted to a voltage signal to control rotation speed of the computer fan according to the result of the comparison, a integrated circuit connected to the super I/O chip and the fan connector and configured for converting the another PWM signal to an analog voltage signal. | 06-25-2009 |
| 20090169188 | Apparatus and method for fan auto-detection - An apparatus for detecting a type of fan and controlling the fan, the fan providing during operation a tachometer signal indicating a speed of the fan, the apparatus includes: a direct current (DC) generator for coupling to the fan and configured to provide a first voltage to the fan; a resistor for providing, while the DC generator provides the first voltage, a sensed voltage relating to the type of the fan, wherein the resistor is connected to a reference voltage and for coupling to a pulse-width modulation (PWM) control terminal of the fan; an input judgment component coupled to the resistor to receive the sensed voltage, the input judgment component being configured to determine whether the fan is a 4-wire PWM fan with an internal pull-up resistor based on the sensed voltage and to provide a judgment signal indicating the determination; a PWM generator coupled to the input judgment component to receive the judgment signal, the PWM generator being configured to provide to the fan a PWM control signal to control the fan if the judgment signal indicates that the fan is the 4-wire PWM fan with an internal pull-up resistor; and a tachometer coupled to the DC generator and the PWM generator, the tachometer being configured to receive the tachometer signal to detect a change in the speed of the fan. | 07-02-2009 |
| 20090190904 | Optimized Determination of the After-Run Voltage in DC Motors - A device and a method are provided for determining the after-run voltage of a direct current motor which is operated via cycled control. In normal operation the direct current motor is controlled via PWM control and a first specifiable pulse/no-pulse ratio. An evaluation unit is provided for determining an after-run voltage variable which is representative of the after-run voltage of the motor. Furthermore, for determining the after-run voltage variable the direct current motor is controlled via a specifiable, variable second pulse/no-pulse ratio. | 07-30-2009 |
| 20090310948 | REGULATING DEVICE FOR REGULATING THE VOLTAGE ON A HIGH-SIDE LOAD - The invention to an electronic control system, controlled by a pulse width-modulated signal (SG) related to earth, for regulating the voltage (Umot) across a high-side load (M), in particular a fan control unit for motor vehicles. The circuit part that converts the pulse width-modulated signal (SG) into the reference input variable (U−) needed for the regulation uses the positive potential of the supply voltage (V | 12-17-2009 |
| 20090324205 | PULSE COUNT CONTROL FOR BRUSHED DC MOTOR DRIVEN BY PULSE WIDTH MODULATION - Systems and methods for determining the occurrences of pulses for implementing a pulse count monitoring method for driving a brushed DC motor driven by a pulse width modulated (PWM) driving current. The method comprises acquiring the driving current signal; performing peak detection on the acquired signal; identifying the largest peaks and thus determining the occurrence of pulses. The peak detect is implemented by fast peak detection or diode peak detection operable to detect appropriate peak widths as determined by the chosen PWM frequency, duty cycle and PWM pulse height. | 12-31-2009 |
| 20100027979 | MOTOR CONTROLLER AND ELECTRIC POWER TOOL HAVING THE SAME - A motor controller is provided with a velocity processing unit that determines a corrected target rotation velocity by correcting the inputted target rotation velocity of the motor in accordance with a velocity deviation between the inputted target rotation velocity and an actual rotation velocity detected from the motor, a first PWM circuit that repeatedly outputs an on-signal having a first pulse width at a first carrier frequency, wherein the first pulse width of the on-signal is modulated by the first PWM circuit in accordance with the corrected target rotation velocity, a second PWM circuit that repeatedly outputs an on-signal having a second pulse width at a second carrier frequency, wherein the second pulse width is different from the first pulse width, the second carrier frequency is lower than the first carrier frequency, and the second pulse width of the on-signal is modulated by the second PWM circuit in accordance with the corrected target rotation velocity, an AND circuit that receives the on-signal outputted from the first PWM circuit and the on-signal outputted from the second PWM circuit and outputs third on-signal which is a logical product of the on-signals, and a voltage apply circuit that applies voltage to the motor intermittently in synchronization with the third on-signal outputted from the AND circuit. As a result, the rotation velocity of the motor may be correctly controlled. | 02-04-2010 |
| 20100220982 | MOTOR CONTROL APPARATUS AND IMAGE FORMING APPARATUS - A motor control apparatus for controlling a DC motor includes a detection unit configured to detect an angular speed of the DC motor, and a control unit configured to, when the DC motor is accelerated, increase a control value that controls a driving of the DC motor at a constant rate from a first control value corresponding to an angular speed lower than a target angular speed up to a second control value corresponding to an angular speed higher than the target angular speed, and switch the control value that controls the driving of the DC motor to a control value corresponding to the target angular speed in response to the detection result of the detection unit reaching the target angular speed. | 09-02-2010 |
| 20100278518 | MEASURING PRESSURE - A method and apparatus are disclosed for determining a negative pressure generated by a suction pump of a topical negative pressure (TNP) system. The method includes the steps of disconnecting a drive voltage from a pump of the TNP system, determining an EMF generated by a free-wheeling element of the pump, selecting a new drive voltage for the pump and reconnecting the new drive voltage to the pump. | 11-04-2010 |
| 20110262112 | Rotation detecting apparatus and rotation detecting system - A rotation detecting apparatus for detecting a rotational state of a direct-current motor includes a driving device, a control device, an energization detecting device, an alternating-current component detecting device, and a rotational state detecting device. An impedance between brushes of the motor changes periodically in accordance with rotation of the motor. The alternating-current component detecting device detects change of an alternating-current component of electric current that is supplied to the motor based on an electrical quantity. The change of the alternating-current component is caused by change of the impedance caused in accordance with the rotation. The rotational state detecting device detects at least one of a rotation angle, a rotational direction, and a rotational speed of the motor based on a detection result of the alternating-current component detecting device. | 10-27-2011 |
| 20150333675 | METHODS AND SYSTEMS TO IMPROVE DC MOTOR COOLING FAN EFFICIENCY WITH PULSE WIDTH MODULATION FREQUENCY VARIATION - Methods, systems and a vehicle are provided for. The method provides for controlling pulse width modulation by a transistor based on the speed of a motor and a transfer function. The system includes a memory storing the transfer function, a transistor modulating an output current, a direct current power source providing the modulated output current to the motor via the transistor, a heat sink configured to absorb heat from the transistor and reflecting a transistor temperature, and a computing device, the computing device being configured to receive an electronic signal representing a desired speed of the motor and being configured to control the modulating input voltage, wherein the transistor produces the modulated output current at a switching frequency from the direct current power source based on the transistor temperature, and with a duty cycle based on the electronic signal as an input to the transfer function. | 11-19-2015 |
| 20160065104 | Sensorless DC Fan Speed Controller - A method of maintaining a calibrated DC fan motor is provided in which normal operation of the motor is periodically and temporarily suspended in order to calibrate the motor. During normal operation, the motor controller selects an appropriate PWM control signal to achieve the desired motor speed. This PWM control signal is later modified during the calibration process on the basis of the difference between the desired motor speed and the actual motor speed, where the actual motor speed is determined by temporarily interrupting power to the motor, measuring the back EMF of the motor, and calculating the actual motor speed based on the back EMF. When normal operation is resumed, the motor controller uses the modified PWM control signal. | 03-03-2016 |
| 388812000 | By phase and frequency modification | 1 |
| 20080292292 | DEVICE AND METHOD FOR CONTROLLING BRUSHLESS DC ELECTRIC MACHINE - A controller of a brushless DC electric machine having a rotor and at least a stator winding powered by a driving voltage is provided. The controller includes a position sensor, an advance angle control circuit, and a driving circuit. The position sensor is moved along a reverse rotating direction of the rotor by a prepositioned angle for outputting a position signal. The advance angle control circuit receives the position signal and a driving voltage reproduction signal reproduced from the driving voltage and outputs a commutation control signal lagging the position signal by a first delay time. The driving circuit receives the commutation control signal for outputting a driving signal for controlling a commutation of the brushless DC electric machine. | 11-27-2008 |
| 388813000 | By phase modification | 1 |
| 20080232786 | Method for Supplying Electrical Power to a Dc Motor Which Can Be Commutated Electronically Via a Semiconductor Power Output Stage - A method is proposed for supplying electrical power to a DC motor ( | 09-25-2008 |
| 388815000 | By voltage or current modification | 5 |
| 20080199159 | Fan motor controller - A fan motor controller comprised of a power supply unit, three driving circuits., three power output circuits, a microprocessor, a voltage raising and compensation circuit, a Back-EMF sensing circuit, a current-limit protection circuit, and a speed control circuit. The fan motor controller eliminates the use of a Hall sensor, enables the field effect power transistor of the works in full conduction of each power output circuit to work in full conduction so as to lower the temperature. | 08-21-2008 |
| 20080199160 | Electric Power Steering Device, And Control Method Thereof - An actual detected current value and a target voltage value of an electric motor are subjected to a low-pass filter process, and amounts of change per time in the filtered actual current value and the filtered target voltage value are calculated. If the amount of change in the actual current value on the increase side is greater than a criterion value and the amount of change in the target voltage value on the decrease side is greater than a criterion value, it is judged that the stroke end has been reached. Then, the upper limit value of the target current value is set at the actual current value obtained in the immediately previous cycle of the feedback control, so as to prevent generation of unnecessary torque. | 08-21-2008 |
| 20080247735 | ADAPTIVE AND RECONFIGURABLE SYSTEM FOR DC MOTOR CONTROL - An integrated circuit for controlling a DC motor is disclosed. The integrated circuit includes at least one digital position and speed circuit (DPS) for providing measurements of speed, position, and direction of the motor, the DPS being in signal communication with the motor for receiving a pair of signals having a quadrature relationship; and at least one programmable gain amplifier (PGA) electrically coupled to the motor, the PGA being configured to receive a feedback signal indicative of current flowing through the motor and to apply a second signal to the motor for adjusting the speed of the motor; and at least two analog-to-digital converters (A/D), one A/D being used to quantize the output of the PGA for an off-chip processor; and another A/D to provide motor reference position from an analog sensor, such as a potentiometer; and at least two digital-to-analog converters (D/A), one D/A used to set the motor voltage; and another D/A used to set the motor current limit. The integrated circuit can be incorporated into a larger motor control loop which further includes a summing amplifier for providing the feedback signal to the motor that is indicative of current flowing through the motor; a buffer amplifier electrically for sensing the output current of the motor, and a processor for providing control signals to the system monolithic module and for receiving the measurements of speed, position, and direction of the motor. | 10-09-2008 |
| 20090022483 | Device and method for driving a single phase motor - A driving device is provided for controlling the rotation of a motor. The driving device comprises an input module, a comparing module and a processing module. The input module includes a voltage generating unit and a voltage adjusting unit to generate a comparing voltage. The voltage generating unit generates a voltage signal according to a basis voltage. The voltage adjusting unit is coupled to the voltage generating unit for adjusting the voltage signal and generating the comparing voltage according a reference voltage. The comparing module is coupled to the input module for comparing a selecting signal with the comparing voltage and generating a comparing signal. The processing module is coupled to the comparing module and generates a control signal according to the comparing signal. The driving device controls the rotation of the motor according to the control signal. | 01-22-2009 |
| 20090154906 | System and Method for Controlling Multiple DC Fans - A system and method for controlling multiple cooling fans is presented. The circuitry for directly driving each of the motors is removed from the motor casings, thus increasing air flow and reducing replacement costs should a motor fail. The system includes a common processor for centrally controlling the speeds of the motors and monitoring the performance of each of the multiple motors. | 06-18-2009 |
| 388816000 | Analog armature control | 9 |
| 388819000 | By pulse width or duty cycle modification | 4 |
| 20090028532 | CONTROL DEVICE FOR DRIVING A BRUSHLESS DC MOTOR - A delta type inverter is used in conjunction with a closed-loop motor controller to provide a control device for driving a three phase brushless direct current motor. The delta inverter has one-half of the solid state switching devices and diodes required by conventional bridge type inventers, thereby improved reliability, and enabling the motor control device to have reduced size, cost and weight. The closed-loop motor controller may include a torque loop for reducing torque ripple during operation of the motor. | 01-29-2009 |
| 20090190905 | Regulator Circuit for an Electric Motor, Provided with a Microprocessor - The invention relates to a regulator circuit for controlling the power fed to an electric motor from a voltage source, wherein the regulator circuit comprises a semiconductor switching element connected in series to the electric motor and the voltage source for the purpose of controlling the power fed to the electric motor, a control circuit for controlling the semiconductor switching element, and a first operating element for operating the control circuit by means of an operating signal generated by the operating element and fed to the control circuit, wherein a microprocessor is incorporated in the control circuit. The microprocessor can be adapted to control numerous functions within the regulator circuit, in particular monitoring and safety functions. It is however also possible for the microprocessor to be adapted to control the power fed to the electric motor subject to the operating signal. This can relate to performing of this single function as well as to performing this function in combination with safety functions. | 07-30-2009 |
| 20090208192 | DEVICE FOR CONTROLLING ROTATION SPEED OF COMPUTER FAN - An exemplary device for controlling rotation speed of a computer fan includes an identifying device and a control circuit. The identifying device is configured for identifying the type of the computer fan. The control circuit configured for controlling rotation speed of the computer fan includes an electric switch, an integrated circuit, a first output terminal, and a second output terminal. The electric switch has a first terminal coupled to the identifying device to receive an identifying signal, a second terminal coupled to a super I/O chip to receive a PWM signal. The integrated circuit is configured to convert the PWM signal to an analog voltage signal. The first output terminal is configured to output the PWM signal to a PWM control pin of a fan header. The second output terminal is configured to output the analog voltage signal to a power pin of the fan header. | 08-20-2009 |
| 20090269043 | APPARATUS AND METHOD FOR CONTROL OF AN ACTIVE FRONT STEERING (AFS) SYSTEM - A motor control strategy for a motor in a front steering system for a vehicle that reduces vibrations from the motor being transferred to a vehicle hand-wheel. The control strategy also includes operating the electric motor in a commutation freeze mode if a position error signal is less than a first predetermined threshold by sending signals to coils of the motor to prevent to the motor from rotating, operating the electric motor in a commutation normal mode if the position error signal is greater than a second predetermined threshold that is greater than the first predetermined threshold, and operating the electric motor in an angle step mode if the position error signal is between an intermediate threshold and the second threshold where the angle step mode provides a signal to the motor to move the motor forward or backward a predetermined number of motor steps, one step at a time. | 10-29-2009 |
| 388820000 | By phase or frequency modification | 1 |
| 20080298785 | METHOD AND SYSTEM FOR OPERATING A MOTOR TO REDUCE NOISE IN AN ELECTRIC VEHICLE - Methods and systems for operating a motor coupled to an electrical bus in a vehicle are provided. Selected resonant frequencies of the electrical bus are determined. The selected resonant frequencies include a low resonant frequency and a high resonant frequency. Power is provided to the motor through at least one switch operating at a switching frequency. The switching frequency is controlled as a function of a rate of operation of the motor. The function is characterized by one of a first substantially linear portion having a first slope when the switching frequency is less than or equal to a selected switching frequency and a second substantially linear portion having a second slope if the switching frequency is greater than the selected frequency, the selected switching frequency being greater than the low resonant frequency and a substantially linear portion having a y-intercept being greater than the low resonant frequency. | 12-04-2008 |
| 388821000 | By voltage and current modification | 1 |
| 20100284673 | POWER SUPPLY CONTROL DEVICE FOR CONTROLLING POWER SUPPLY CONNECTED TO MOTOR - A power supply control device controls a power supply connected to a motor and includes: an AC/DC converter that makes a first DC power supply; a DC/DC converter that makes a second DC power supply out of the first DC power supply; a first rectifying element that allows current to flow from the first DC power supply toward the motor; a second rectifying element that allows current to flow from the first DC power supply toward the DC/DC converter; and a third rectifying element that allows current to flow from the motor toward the DC/DC converter. In this way, a power supply connected to a motor can be suitably controlled. | 11-11-2010 |
| 388822000 | By voltage modification | 1 |
| 20090169189 | Motor control apparatus - A motor control apparatus includes a fan motor, a hall IC, a first power generator, and a second power generator. The hall IC is coupled with the fan motor for detecting the status of the fan motor, such as rotating or stationary. The first power generator is connected with the hall IC for outputting a first voltage to the hall IC to supply the required power for the hall IC. The second power generator is connected with the fan motor for outputting a second voltage to the fan motor to control the rotation speed of the fan motor. | 07-02-2009 |
| 388823000 | By current modification | 1 |
| 20090263110 | Soft start motor control using back-EMF - A method of controlling in-rush current to a DC motor is disclosed. The method may include operating the DC motor in a first mode including applying back-EMF across a relay coil to maintain the relay in an open configuration when the back-EMF is below a predetermined voltage. The method may also include operating the DC motor in a second mode including applying the back-EMF across the relay coil to maintain the relay in a closed configuration when the back-EMF is equal to or above the predetermined voltage. | 10-22-2009 |
| 388824000 | By variable impedance (e.g., potentiometer) | 1 |
| 20080253752 | METHOD FOR DETECTING AND CONTROLLING OUTPUT CHARACTERISTICS OF A DC MOTOR AND A SELF-PROPELLED APPARATUS USING THE SAME - A method for detecting and controlling output characteristics of a DC motor is provided in the present invention, wherein an input impedance related to the DC motor is measured for analyzing the output characteristics of the DC motor so that the output characteristics of the DC motor is capable being controlled according to the requirement of usage. By means of the foregoing method, the present invention further provides a self-propelled apparatus which functions to detect and control the output of the DC motor for maintaining the moving speed according to the environment status and road condition. | 10-16-2008 |
| 388825000 | OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR | 15 |
| 20090060478 | MOTOR CONTROL DEVICE - A motor control device includes a rotation speed control circuits a voltage transforming circuit, a buffering circuit and a driving circuit. The rotation speed control circuit provides a rotation speed control signal. The voltage transforming circuit is electrically connected to the rotation speed control circuit and transforms the rotation speed control signal to a speed control voltage signal. The buffering circuit, electrically connected to the voltage transforming circuit, receives the speed control voltage signal and delays or buffers output of the speed control voltage signal. The driving circuit, electrically connected to the buffering circuit, receives the speed control voltage signal from the buffering circuit and generates a driving signal according to the speed control voltage signal so as to control the operation of the motor. | 03-05-2009 |
| 20090175602 | CIRCUIT FOR CONTROLLING ROTATION SPEED OF COMPUTER FAN - A circuit for controlling rotation speed of a computer fan includes a fan header for connecting to a 4-pin fan or a 3-pin fan, a jumper device, an amplifier, and a controller. The jumper device has a first pin for receiving a controlling signal, and connected to a first power source, a second pin connected to the fan header, and a third pin connected to the first power source. The amplifier has an input terminal connected to the third pin of the jumper device via an integrator. The controller has a first terminal connected to an output terminal of the amplifier, a second terminal connected to a second power source, and a third terminal connected to the fan header and connected to a positive input terminal of the amplifier via a resistor. The first pin of the jumper device is selectively connected to the second or third pin. | 07-09-2009 |
| 20100046933 | MOTOR DRIVING SYSTEM - A motor driving system includes a power supply, a driver, a motor, and a control unit. The driver includes a driving module and a power converting module. The driving module is connected to the power supply. The power converting module is connected to the power supply. The motor includes a power terminal connected to the power converting module. The control unit is connected to the power converting module. The power supply is configured to provide power for the driver. The driving module is configured to control the motor. The control unit is configured to control the power converting module to output a changeable voltage to the motor. | 02-25-2010 |
| 388828000 | Armature control by digital or combined analog and digital circuitry | 9 |
| 20090220219 | Delta-Sigma Modulator for a Fan Driver - A fan driver circuit for powering a fan with a linear voltage may be designed using digital design techniques, resulting in a testable, accurate circuit on a smaller die size. The fan driver circuit may be configured to receive a digital control signal, which may be a sequence of numeric values, e.g. multiple-bit binary numbers, each indicative of a desired present rotational speed of the fan. The fan driver circuit may be implemented using a digital modulator, e.g. a delta-sigma modulator, with a simple low-pass filter, e.g. an RC-filter at the output, and may use oversampling based on a system clock, to shift in-band noise to out-of-band frequencies, and digital interpolation to filter out unwanted images from the upsampled digital control signal. The delta-sigma modulator may be constructed as a first-order delta-sigma modulator using an error-feedback structure to reduce die size. | 09-03-2009 |
| 388829000 | By pulse width or duty cycle modification | 8 |
| 20080253753 | Brushed Motor Control with Voltage Boost for Reverse and Braking - A single low side power transistor switch is used to efficiently control a brushed motor in a forward rotational direction. A boost voltage power supply is used to supply voltage to the brushed motor in a reverse rotational direction and/or braking from the forward rotational direction. A digital device controls the brushed motor rotational speed and rotational directions. | 10-16-2008 |
| 20090047006 | FAN SYSTEM AND MOTOR CONTROL DEVICE - A fan system includes a control device and a fan device. The control device has a first node, a rotation speed signal generation circuit and a rotation speed reading circuit. The fan device has a second node, a signal transforming circuit, a motor driving circuit, a motor and a fan. The first node is electrically connected with the second node to set up a transmission route between the control device and the fan device. The rotation speed control signal and the motor rotation speed signal are transmitted via the two-way transmission route, and the control device controls the fan device via a wired or wireless transmission route. A motor control device is also disclosed. | 02-19-2009 |
| 20090060479 | BUCK CONVERTER WITH IMPROVED FILTER DESIGN - A buck converter for use in controlling a motor in accordance with an embodiment of the present invention includes a power input operable for connection to a DC power supply, a switch for selectively connecting the motor to the power supply, a pulse width modulation controller operable to provide a pulse width modulation signal to the switch, wherein the switch connects the motor to the power supply based on the pulse width modulation signal, and a voltage shifting capacitor connected across the switch and in series with a diode. The buck converter may include a shift control device operable to control a voltage across the voltage shifting capacitor. | 03-05-2009 |
| 20090129761 | Actuator for Automotive Climatization Units - The present patent application refers to an actuator for automotive climatization units, of the type designed to be driven by an electric control unit with direct current and low voltage, characterised in that it is provided with an electric motor able to operate at a lower voltage than the voltage delivered by the control unit and characterised in that it is provided with an electronic device able to modify the ascending ramp angle of the voltage of the successive pulses from the said control unit, in such a way that each pulse has an ascending ramp with sloped profile, so that the maximum voltage value of each pulse depends on the pulse duration. | 05-21-2009 |
| 20090148138 | Method for controlling an electric motor by using the PWM Technique - A method for controlling an electric motor by using the PWM technique; the control method includes the steps of: applying to the clamps of the electric motor an electric voltage varying in time, which displays a square waveform and consists of a sequence of pulses having a uniform wave period and a variable amplitude; adjusting the average value of the electric voltage applied to the clamps of the electric motor by varying the amplitude of the pulses of the electric voltage; determining, in the case of a variation of the amplitude of the pulses, the overall required amplitude variation; subdividing the overall required amplitude variation in a determined number of partial variations, the overall sum of which is equivalent to the overall required amplitude variation; and gradually varying the amplitude of the pulses of the electric voltage by applying in a sequence a corresponding partial variation to each pulse, so that the difference between the amplitude of a pulse and the amplitude of a following pulse is equivalent to the corresponding partial variation. | 06-11-2009 |
| 20090148139 | Method of Operating Drill with Solid State Speed Control - A method of operating a hand power tool in one embodiment includes generating a variable speed control signal with a solid state switch that corresponds to a selected speed for a motor, generating a pulse width modulated (PWM) signal corresponding to the variable speed control signal, generating H-bridge driving signals for an H-bridge circuit in correspondence with the PWM signal, and selectively coupling a motor to a power source using the H-bridge circuit in accordance with the H-bridge driving signals. | 06-11-2009 |
| 20110044669 | CIRCUIT FOR CONTROLLING A NUMBER OF MOTORS - The invention relates to a circuit for controlling a number of DC motors (M | 02-24-2011 |
| 20130004148 | ELECTRIC MOTOR HAVING A PULSE WIDTH MODULATOR - The invention relates to an electric motor having a stator and a rotor. The electric motor also comprises a controller, wherein the controller is connected to the stator and/or rotor, and is designed for applying current to the stator and/or rotor for rotating the rotor. According to the invention, the controller comprises a pulse width modulator designed for controlling a power output of the electric motor, in order to generate a predetermined number of different current application patterns. The current application patterns each represent a power output of the electric motor, and preferably comprise a time sequence of current pulses, each having a current pulse duration. The controller is designed for applying current to the electric motor according to at least two different current application patterns for actuating the electric motor during a time interval of actuation, such that a power output of the electric motor in the time-based average of the time interval of actuation, in particular from the beginning to the end of the time interval, is different from the power outputs represented by the current application patterns in the time interval of actuation. | 01-03-2013 |
| 388830000 | Analog armature control | 3 |
| 388831000 | By pulse width or duty cycle modification | 2 |
| 20080317446 | Electronic module and arrangement for signal transmission with the former - The invention concerns an electronic module for a motor vehicle, in particular a fan regulator ( | 12-25-2008 |
| 20090190906 | MOTOR SYSTEM WITH REDUCED COMMON-MODE NOISE - A motor system with reduced common-mode noise includes an AC power, a first transformer unit electrically connected to the AC power and providing a first DC power, and a second transformer unit electrically connected to the AC power and providing a second DC power. The first DC power is supplied to a motor driving section of the motor system, and the second DC power is supplied to a motor controlling section of the motor system. Therefore, a common-mode noise from the transformer winding for the motor driving section can be prevented from coupling to the transformer winding for the motor controlling section. Moreover, a safe stop signal is applied to turn down a PWM IC for power through a photo coupler or a relay. Therefore, the first transformer unit stops supplying current to the motor driving section of the motor system to enhance safe stop function for the motor system. | 07-30-2009 |
| 388833000 | By voltage or current modification | 1 |
| 20090148140 | Electronic Device for Regulating the Voltage Across a High-Side Load - The invention relates to an electronic control device for regulating the voltage across a high-side load, especially for regulating a fan in a motor vehicle, with a control voltage (V | 06-11-2009 |
| 388842000 | CLOSED LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR | 2 |
| 20120063750 | Speed Controller for Electric Motor - A speed controller for a small electric motor is described. The controller is used to control small electric motors such as those used in small power tools such as electric screwdrivers. A series of electrical components are used to allow the motor to remain idle until a load is applied to the motor. When a load is applied to the motor, it increases in speed quickly to its maximum speed and remains there until the load is removed from the motor. | 03-15-2012 |
| 388844000 | Armature control | 1 |
| 388847000 | By voltage or current modification | 1 |
| 20110243537 | Motion control of impedance-type haptic devices - A control method for an haptic device is provided with particular attention to motor control amplifiers exploiting the inate motor dynamics of DC motors. The control method encompasses a digital and analog circuit. In the digital circuit, a command voltage is determined by a digital controller utilizing sensed motion information of the haptic device and a motion command signal. In the analog circuit, an amplifier applies a voltage to an electrical DC motor. The applied voltage incorporates the determined command voltage from the digital controller and a voltage to reduce the electrical dynamics of the electrical DC motor. | 10-06-2011 |
| 388848000 | OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR | 1 |
| 388853000 | Armature control | 1 |
| 388854000 | By voltage or current modification | 1 |
| 20130251352 | WIPER DEVICE - A wiper device that includes: a wiper motor that swings a wiper blade that is coupled to the wiper motor through a wiper arm to-and-fro over a window pane between an upper return position and a lower return position; and a drive component that gradually increases power supplied to the wiper motor until the rotation speed of the wiper motor reaches a specific speed when the wiper motor has been restarted from a stationary state of the wiper blade between the upper return position and the lower return position. | 09-26-2013 |
