Class / Patent application number | Description | Number of patent applications / Date published |
318430000 | MOTOR LOAD, ARMATURE CURRENT OR FORCE CONTROL DURING STARTING AND/OR STOPPING | 45 |
20080272724 | FAN MOTOR DRIVING CIRCUIT - A fan motor driving circuit controls an energized state of a fan motor by performing on and off control of a switching circuit connected to a coil of the fan motor of a driving object. A variable reference voltage circuit generates a voltage whose voltage level changes with time by charging or discharging a capacitor at the start of starting up the fan motor. A drive signal combining unit generates drive signals on the basis of the voltage when at least starting up, and performs on and off control of the switching circuit by the drive signals. An initialization circuit initializes the capacitor before starting up with a transition from off to on of a power supply voltage to be supplied to the fan motor driving circuit as a turning point. | 11-06-2008 |
20080278103 | MOTOR CONTROL DEVICE - The present invention is a motor control device comprising a control system, the control system being capable of controlling the motor by PWM and having integration means being capable of outputting an integrated value obtained by integrating a deviation between a rotation speed and a target rotation speed of a motor, the motor control device being capable of starting control with the control system for causing the motor to rotate at the target rotation speed after rotation of the motor has been started. In this motor control device, an output value of the integration means at a time when control with the control system is to be started is set to have a value that corresponds to a counter electromotive force generated in the motor by its rotation. | 11-13-2008 |
20080315812 | Method and device for starting an electric machine with a magnetically mounted rotor - A method and a device with a control apparatus ( | 12-25-2008 |
20090009119 | POWER CONVERTING DEVICE FOR ELECTRIC TRAIN - A power converting device for an electric train includes a power converter, an alternating-current motor, a primary control unit, and a control unit. The power converter converts direct-current power into alternating-current power. The alternating-current motor is driven by the alternating-current power output from the power converter. The primary control unit outputs a power-running notch command that determines an acceleration speed for the electric train. The control unit controls an amount of the alternating-current power based on the power-running notch command. The control unit sets the amount of the alternating-current power to zero without a delay after receiving an OFF signal of the power-running notch command during power running. | 01-08-2009 |
20090066280 | MOTOR DRIVE CIRCUIT AND COOLING SYSTEM USING SAME - A motor driving circuit generates pulse driving signals, and controls the ON/OFF state of a switching circuit connected to a coil of a motor which is to be driven, thereby controlling the conduction period of the motor. A driving signal generating circuit generates the driving signals such that they are pulse modulated according to the torque target value for the motor, and outputs the driving signals to the switching circuit. A current detection circuit detects the current flowing through the coil of the motor. A current limiting circuit controls the logical values of the driving signals generated by the driving signal generating circuit such that the current detected by the current detection circuit does not exceed a predetermined current upper limit. The current limiting circuit increases the current upper limit according to the time elapsed in the starting operation of the motor. After the starting operation of the motor, the current upper limit is set to a predetermined fixed value. | 03-12-2009 |
20090091280 | STOCHASTIC ANTI-WINDUP PROPORTIONAL-INTEGRAL (PI) CONTROLLER - Different circuit-based implementations of stochastic anti-windup PI controllers are provided for a motor drive controller system. The designs can be implemented in a Field Programmable Gate Arrays (FPGA) device. The anti-windup PI controllers are implemented stochastically so as to enhance the computational capability of FPGA. | 04-09-2009 |
20090174356 | STARTING CIRCUIT FOR SINGLE-PHASE AC MOTOR - A starting circuit for a single-phase AC motor, comprising a main winding, a detecting circuit, a rectifying and filtering circuit, a triggering circuit, a switching circuit and a starting winding. The detecting circuit is connected in series to the main winding for transforming current parameters thereof into detecting signals. The switching circuit is connected in series to the starting winding. The rectifying and filtering circuit processes the detecting signals and the processed detecting signals to the triggering circuit. The triggering circuit enables or disables the switching circuit according to the detecting signals, so as to energize or deenergize the starting winding. The starting circuit features high reliability, long lifetime, simple circuit structure, low cost, and small size. | 07-09-2009 |
20090206783 | Soft start for electric motor of a power tool - A power tool has an electric motor with field windings. In an aspect of the invention, each field winding includes two coils wound with the same number of turns of the same gauge magnet wire. When the motor is first energized, the two coils of each field winding are connected in series, reducing in-rush current. Upon expiration of a soft start period, which can be after the motor reaches a predetermined speed or upon expiration of a predetermined time period, the two coils of each field winding are connected in parallel. In another aspect of the invention, an electric motor used in a power tool includes field windings that are connected in series with a separate start winding when the motor is first energized. Upon expiration of the soft start period, the start winding is bypassed. In another aspect of the invention, the separate start winding includes two sub-windings. The two sub-windings are connected in a way that magnetic field created by the two sub-windings is counterbalanced so that the overall magnetic force created by the start winding in the motor armature is minimized or zero. Also, the voltage across the two sub-windings is minimized or zero. In another aspect, the field windings are connected in series with a start impedance when the motor is first energized and a time delay relay having a set of delay contacts coupled across the start impedance energized. Upon expiration of the soft start period, the time delay contacts close, bypassing the start impedance. In an aspect, the motor is a universal motor. | 08-20-2009 |
20090267552 | Soft Starting Method and System Thereof in the Way of Wave-Skipping with Stepped Frequency and Stepless Voltage Regulating for a Motor - The invention relates to a soft starting method and system thereof in the way of wave-skipping with stepped frequency and stepless voltage regulating for a motor which can be applied to the large torque starting of AC motor under the condition of a power supply of a industrial frequency supply source and the safe starting of higher load. Trigger signals generated by a control system, in the soft starting method of the invention, act on five sets of anti-parallel thyristor valves connected between the power supply and the motor to conduct a pair of thyristors thereof according to a set frequency and sequence, and the motor is started from a standstill status to full speed in the way of wave-skipping by controlling the sets of the thyristor valves. The method may improve the starting torque for more than 10 times of the traditional motor soft starting of the voltage reduction and control the starting current for about two times of the rated current. The cost thereof is only 20-25% of similar frequency converter. | 10-29-2009 |
20090267553 | UNKNOWN - A starting device for an internal combustion engine, especially that of a motor vehicle, comprises:
| 10-29-2009 |
20100045223 | Method for operating a motor system, and motor system - In order to enable in a motor system, in which a soft start of the motor has been implemented, the operation of the motor, wherein the power consumption is reduced, it is proposed to operate the driver circuit during a switch-on phase in order to carry out a soft start of the motor. In at least one embodiment, the driver circuit can be bypassed in a normal operational phase as a function of a load, by means of which the motor is operated. | 02-25-2010 |
20100225263 | MOTOR DRIVING CIRCUIT AND METHOD FOR DRIVING MOTOR - A motor driving circuit receives a control pulse signal pulse-width modulated according to a target rotational speed, and drives a fan motor. A start pulse signal generating unit generates a start pulse signal having a predetermined duty ratio. A driving unit drives the fan motor by pulse width modulation according to the driving pulse signal received from a control unit. When the duty ratio of the control pulse signal is switched from zero to a nonzero value when the fan motor is in the stopped state, the control unit commences the driving operation for the fan motor. The control unit outputs, as the driving pulse signal, the start pulse signal, in a predetermined start period Ts from the commencement of the driving operation. After the start period elapses, the control unit outputs the control pulse signal as the driving pulse signal. | 09-09-2010 |
20100270961 | Method and Device for Controlling an Electric Motor ( amended - A method and a device for controlling and/or regulating an electric motor. Such electric motors are used for example in motor vehicles in the form of pump motors. In general, the electric motor is supplied with electrical energy from a battery and/or using a generator. The controlling and regulation take place using a high-frequency pulse width modulation (PWM). When the electric motor is started, the PWM is used to continuously increase the motor current required for the operation of the electric motor, e.g. beginning from 0. | 10-28-2010 |
20100327790 | CONTROL METHOD AND MOTORSTARTER DEVICE - A method for controlling an electric motor with a softstarter. A softstarter device for control of electric motors. Motor torque is controlled in dependence of a torque error signal, based on a calculated difference between the motor torque and a reference torque value, so that the motor torque displays a rate of change with respect to time, during a stopping or starting time interval, that is adapted to follow a rate of change of the reference torque value, with respect to time, that varies between at least a first part of the time interval and a second part of the time interval, and thereby changing the speed of the motor. A system includes an electric motor, a device driven by the electric motor and a softstarter device for controlling the electric motor. A computer program product includes a computer readable medium and a computer program recorded thereon. | 12-30-2010 |
20110181222 | MOTOR CONTROL SYSTEM AND METHOD - A highly efficient and reliable motor control system and motor control method are provided. The motor control system includes a motor having a plurality of sets of armature windings, a plurality of inverters which drive the plurality of sets of armature windings, and a plurality of control devices which control the inverters individually. In the motor control system: while a motor torque command is in a smallest-magnitude range, a first inverter is operated to energize a first set of armature windings; when the motor torque command increases into a next larger-magnitude range, the first and a second inverter are operated to energize the first and a second set of armature windings; when the motor torque command increases into a still next larger-magnitude range, the first, the second, and a third inverter are operated to energize the first, the second, and a third set of armature windings; and when the motor torque command increases into a largest-magnitude range, all inverters are operated to energize all sets of armature windings. Thus, the number of inverters driven and/or the number of sets of armature windings energized are sequentially changed according to the torque command. | 07-28-2011 |
20110199032 | CONTROL APPARATUS FOR MATRIX CONVERTER - A control apparatus for a series-connected multi-level matrix converter includes each voltage commanding device provided for each of single-phase matrix converters to generate a voltage reference to each of the single-phase matrix converters. The series-connected multi-level matrix converter includes the single-phase matrix converters. Each of the single-phase matrix converters includes a snubber circuit and a DC voltage detecting section configured to detect a DC voltage of the snubber circuit to output a DC voltage detection value. ADC over-voltage detector is configured to output a DC over-voltage signal when the DC voltage detection value exceeds a set voltage value. A voltage modifying device is, when the DC over-voltage signal is outputted, configured to decrease the voltage reference to a corresponding single-phase matrix converter among the single-phase matrix converters based on a deviation between the DC voltage detection value and the set voltage value. | 08-18-2011 |
20120206079 | ENERGY CONVERTER AND ELECTROMECHANICAL APPARATUS - An energy converter includes magnetic coils of N phases (N is an integer of 3 or more), and a PWM drive circuit for driving the magnetic coils of N phases, wherein the magnetic coil of each phase can be independently controlled by the PWM drive circuit. | 08-16-2012 |
20120249036 | Motor Control Apparatus and Image Forming Apparatus - A motor control apparatus includes a target acceleration setting unit, a control unit, an acceleration upper limit estimation unit, a mode switching unit, a detection unit and a trajectory setting unit, wherein the mode switching unit controls the target acceleration setting unit to execute a first setting processing, in which the target acceleration at each time point is set corresponding to a first target acceleration trajectory in which the target acceleration at each time point is set corresponding to a first target acceleration trajectory, a second setting processing in which a target acceleration is set corresponding to the acceleration upper limit, or a third setting processing in which the target acceleration is set corresponding to the second target acceleration trajectory, based on the acceleration upper limit, the target acceleration, the speed of the motor. | 10-04-2012 |
20120274252 | FAN MOTOR CONTROL DEVICE - A fan motor control device for controlling the soft start of a fan motor is disclosed. The fan motor control device comprises a converter, a starting capacitor, and a controller. The converter sends out a control signal to the controller based on an input pulse-width modulation signal. The starting capacitor is coupled between a voltage source terminal and a controlled terminal of the controller. Thereby, based on an input voltage to the controlled terminal, the controller controls the soft start of the fan motor. For the soft start period, the magnitude of the input voltage is determined by the base working voltage outputted via the voltage source terminal. While for normal operation, based on the input voltage to the controlled terminal, the controller controls the speed of the fan motor, with the magnitude of the input voltage determined by the control voltage outputted by the converter. | 11-01-2012 |
20130015799 | Power ConverterAANM Ayano; HidekiAACI HachiojiAACO JPAAGP Ayano; Hideki Hachioji JPAANM Ishikawa; KatsumiAACI HitachinakaAACO JPAAGP Ishikawa; Katsumi Hitachinaka JPAANM Ogawa; KazutoshiAACI HitachiAACO JPAAGP Ogawa; Kazutoshi Hitachi JPAANM Kominami; TsutomuAACI HitachinakaAACO JPAAGP Kominami; Tsutomu Hitachinaka JPAANM Kunihiro; MamiAACI HitachiAACO JPAAGP Kunihiro; Mami Hitachi JP - The present invention provides a power converter which, while ensuring safety, implements control for the flow of a constant current in a specified switching element, more accurately determines the lifetime of a switching element, and reduces the number of temperature detectors. The power converter is provided with a mechanism which causes a brake device to operate or which confirms that a brake mechanism is operating. The power converter supplies current to the d-axis and the q-axis of a rotational coordinate system, within the range of the braking torque of the brake mechanism, and passes the desired current to the desired element. Furthermore, temperature detectors are attached only in chips in sections where a crack readily develops in the upper solder layer or peeling is readily generated in the wire bonding, and in chips where a crack readily develops in the lower solder layer. An accurate lifetime evaluation of a semiconductor module is therefore possible even with a smaller number of temperature detectors. | 01-17-2013 |
20130020975 | OPERATIONALLY DEPENDENT FILTERING FOR SOFT STARTER CURRENT MEASUREMENTS - A system and method for optimizing current filtering in a motor soft starter is disclosed. A motor soft starter includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, with the circuit being operable in a ramping mode and a bypass mode so as to control current flow and terminal voltages in the AC motor. The soft starter includes a controller connected to the circuit to control operation thereof, with the controller including a configurable current filter. The controller determines a current of an AC power provided to the input terminal of the AC motor from the soft starter, identifies a present operational mode of the soft starter as being one of the ramping mode and the bypass mode, and performs filtering on the determined current based on the present operational mode of the soft starter. | 01-24-2013 |
20130038262 | MOTOR CONTROL DEVICE - A motor control device has a drive circuit that drives an electric motor with a battery as a power supply, a switch element that is provided between the battery and the drive circuit, the switch element supplying a current from the battery to the drive circuit when being put into an on state, the switch element cutting off the current from the battery to the drive circuit when being put into an off state, a voltage detector that detects a voltage at the drive circuit, and a controller that operates the drive circuit to control the electric motor. The controller turns on the switch element when the voltage at the drive circuit, which is detected by the voltage detector, is greater than or equal to a first predetermined value during stopping of the control of the electric motor. | 02-14-2013 |
20130187588 | MOTOR DRIVE SYSTEM AND CONTROL METHOD THEREOF - A motor drive system comprising: an inverter that supplies power to a three-phase motor; and a control unit that, when first stopping and then commencing supply of alternating current to three phases of the three-phase motor, switches from first control to third control and then to second control, the first control putting switching elements in the inverter in a non-conduction state, the second control being PWM control of the switching elements, and the third control putting and keeping a switching element of each of an upper arm and a lower arm in the conduction state until commencement of the supply of current, the upper arm corresponding to a phase through which current flows in a direction entering the motor upon commencement of the supply, the lower arm corresponding to a phase through which current flows in a direction exiting the motor upon commencement of the supply. | 07-25-2013 |
20130193890 | MEDIUM VOLTAGE INVERTER CONTROL APPARATUS AND MEDIUM VOLTAGE INVERTER SYSTEM - An exemplary embodiment of the present disclosure includes a medium voltage inverter control apparatus and a medium voltage inverter system using the same. The medium voltage inverter control apparatus determines input voltage information by receiving an input voltage of a medium voltage inverter, compares an output command of the medium voltage inverter with an output of a first PLL unit to output a difference therebetween, and synchronizes the output command of the medium voltage inverter using the difference. | 08-01-2013 |
20130241456 | Starter Apparatus, System, and/or Method for a Separable-Winding Motor - Starter apparatuses are provided for multiple-winding motors. Such starters can function with a single/combined overload device/circuit, rather than requiring multiple overloads relays and separate overload trip circuits for each motor winding. A microcontroller can keep track of the applicable overload trip points and can control multiple discrete contactors appropriately, via a single/combined overload relay. For a specific implementation, additional and/or alternative desirable functionality can also be afforded, including universal voltage input, true power characteristic sensing for status output/annunciation, integrated damper control, and substantially automated trip point selection and/or implementation. | 09-19-2013 |
20130257330 | MOTOR DRIVING CONTROL DEVICE - A motor driving device comprises: an AC/DC converter that converts alternating current power into direct current power; a motor driving unit that operates based on the direct current power supplied from the AC/DC converter and outputs a driving signal to a motor; and a start-up auxiliary circuit that is arranged on a path connecting the AC/DC converter and the motor driving unit, wherein the start-up auxiliary circuit: delays an output of the driving signal for a first predetermined time period after the supply of the alternating current power from the alternating current power supply to the AC/DC converter starts; and gradually increases a driving voltage so that current flowing in a driving coil of the motor is limited to a predetermined value or smaller for a second predetermined time period after the output of the driving signal from the motor driving unit starts. | 10-03-2013 |
20130278196 | METHOD FOR AUTOMATICALLY ESTIMATING INERTIA IN A MECHANICAL SYSTEM - Systems and methods for estimating an inertia and a friction coefficient for a controlled mechanical system are provided. In one or more embodiments, an inertia estimator can generate a torque command signal that varies continuously over time during a testing sequence. The velocity of a motion system in response to the time-varying torque command signal is measured and recorded during the testing sequence. The inertia estimator then estimates the inertia and/or the friction coefficient of the motion system based on the torque command data sent to the motion system and the measured velocity data. In some embodiments, the inertia estimator estimates the inertia and the friction coefficient based on integrals of the torque command data and the velocity data. | 10-24-2013 |
20130334996 | VARIABLE-SPEED HOISTING MACHINE - A variable-speed hoisting machine uses an electric motor having a pull-rotor brake as a hoisting motor and capable of supplying the electric motor with an electric current that can reliably release the pull-rotor brake at the time of starting an operation even in the case of a variable-speed hoisting machine such as an electric chain block in a variable-speed hoisting machine having an electric motor with a pull-rotor brake and an inverter controlling the speed of the electric motor in a soft-start manner, the inverter is set to operate according to a predetermined voltage-frequency (V-F) pattern. | 12-19-2013 |
20130342147 | ASSEMBLY FOR CONTROLLING AN ELECTRIC VACUUM PUMP - An assembly for controlling an electric vacuum pump for a vehicle, which is connectable by at least one switch, which can be controlled by an electronic control unit, to a supply voltage, wherein the electronic control unit in a start-up phase connects the vacuum pump to an additional electrical resistor between the supply voltage and the vacuum pump. | 12-26-2013 |
20140097777 | DRIVING A ROTATING DEVICE BASED ON A COMBINATION OF SPEED DETECTION BY A SENSOR AND SENSOR-LESS SPEED DETECTION - Some of the embodiments of the present disclosure provide a method comprising detecting, based on a sensor and a back electromagnetic force generated in a rotating device, a speed of the rotating device; and based on (i) the speed detected using the sensor or (ii) the speed detected using the back electromagnetic force, driving the rotating device. | 04-10-2014 |
20140176034 | MOTOR DRIVE SYSTEM - A motor drive system includes a first interlock mechanism configured to be activated in response to transition to an operable state of an interruption device, to open an open/close device, a second interlock mechanism configured to be activated in response to transition to an openable state of a case containing a power control unit, to open the open/close device, and a control device. The control device is configured to perform, when the first interlock mechanism is activated, a first process of opening the open/close device after shutting down the power control unit, and to perform, when the second interlock mechanism is activated, a second process of opening the open/close device while driving the power control unit, instead of the first process, depending on a counter electromotive voltage generated by a motor. | 06-26-2014 |
20140232312 | METHOD FOR STARTING A WASHING MACHINE ELECTRIC MOTOR - The present invention relates to a method for starting a washing machine electric motor and, more particularly, an adaptive method for starting a washing machine electric motor, which is especially able to control the firing angle (preferably during the centrifugation cycles) of the voltage cycles depending on the electrical supply voltage and its possible and unpredictable variations and/or oscillations. Such firing angle control of the electrical supply voltage of the electric motor comprises a dynamic control based on the result of the comparisons in the previous steps, and is performed by generating at least one additional correction signal (ASC) based on the result of the comparison between the actual value of the electrical supply voltage of the electric motor and at least one predetermined reference value, and the additional correction signal (ASC) being responsible for controlling the firing angle of the electrical supply voltage of the electric motor. | 08-21-2014 |
20140253005 | THERMAL STRESS REDUCTION IN AIRCRAFT MOTOR CONTROLLERS - A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode. | 09-11-2014 |
20140265974 | METHODS AND SYSTEMS FOR STARTING AN ELECTRIC MOTOR - Methods and systems for starting an electric motor using a motor controller including a processor are provided. The method includes determining if the electric motor is operating, increasing a failed start counter if the electric motor is determined not to be operating, determining a reverse rotation by comparing a failed start counter to a predetermined threshold, and applying a reverse rotation start routine to the electric motor when a reverse rotation is determined. | 09-18-2014 |
20150108932 | APPARATUS FOR RESTARTING MEDIUM VOLTAGE INVERTER - An apparatus for restarting a medium voltage inverter is disclosed, wherein the inverter changes a voltage or a frequency outputted to a motor in response to an input voltage of the motor and a rotor speed of the motor and a predetermined voltage-frequency ratio. | 04-23-2015 |
20150326165 | AC MOTOR WITH STATOR WINDING TAP AND METHODS FOR STARTING AN AC MOTOR WITH A VARIABLE SPEED DRIVE - Methods for starting an AC motor with a variable speed drive and switching the motor to a higher voltage power source are described. Provided are AC motors with a stator having a plurality of coils, the plurality comprising a complete set of coils for each phase, the complete set comprising a first set of coils comprising first groups of coils connected in series, or parallel, or a combination, and a second set of coils comprising second groups of coils connected in series, or parallel, or a combination, wherein the output of a variable speed drive is connected to a tap on the complete set of coils such that the AC motor may be started with a variable speed drive, and an output of the power line is connected to the series of the first and second sets of coils. | 11-12-2015 |
20150333663 | QUASI VARIABLE FREQUENCY MOTOR CONTROLLER - An apparatus for a quasi variable frequency motor controller is includes a DFC module that applies a first frequency to a motor as part of a discrete frequency control (“DFC”) method for motor starting. The first frequency includes a discrete frequency in a plurality of discrete frequencies of the DFC method and each discrete frequency includes a frequency lower than a fundamental frequency of an alternating current (“AC”) voltage source providing power to the motor. The apparatus includes a torque module that determines when motor torque generated by the motor reaches a negative torque threshold and a next frequency module that applies a second frequency to the motor in response to the torque module determining that the motor torque has reached the negative torque threshold. The second frequency is a next frequency in the DFC method. | 11-19-2015 |
20150333685 | QUASI VECTOR MOTOR CONTROLLER - An apparatus includes a switch module that selectively turns on a switch to connect an input power conductor connected to a voltage source to a motor in a sequence. The switch for each phase is turned on for a portion of a cycle of a fundamental frequency of the voltage source. A source phase module determines a phase of the AC voltage source, a back-EMF phase module determines a phase of a back-EMF of the motor, and a torque module determines when a phase difference between the phase of the AC voltage source and the phase of the back-EMF is within a phase range indicative of a positive motor torque. A pulse module enables the switches in response to the phase difference having a phase within the phase range and disables the switches in response to the phase difference having a phase not in the phase range. | 11-19-2015 |
20160173007 | METHOD AND SYSTEM FOR CONTROLLING ELECTRICAL VACUUM PUMP | 06-16-2016 |
318431000 | Initial, "cracking" or "starting from rest" torque control | 6 |
20130002181 | CONTROL METHOD OF ELECTRONIC PARKING BRAKE SYSTEM - Disclosed is a control method of an electronic parking brake system, which variably controls the duty of voltage applied to a motor upon release of the electronic parking brake system. The control method includes controlling voltage applied to a motor to a first duty ratio upon release of the electronic parking brake system, controlling the voltage applied to the motor to a second duty ratio greater than the first duty ratio if locking of the motor occurs and the motor is not operated, and controlling the voltage applied to the motor to the first duty ratio if locking of the motor is released and the motor begins to operate, after the control of voltage to the second duty ratio. | 01-03-2013 |
20130069576 | Soft-Start and Soft-Lock Start on Motor Driving Apparatus - A motor driving apparatus is disclosed herein and includes a control unit, a soft-start unit and an output unit. When power-up or lock release situation, an external PWM driving signal is inputted to the soft-start unit, the soft-start unit generates an internal PWM driving signal and a power-up initial signal; after the power-up initial signal is generated, the control unit transmitting a motor rotation signal to the soft-start unit; when the soft-start unit counts a plurality of the motor rotation signal, the soft-start unit selects the external PWM driving signal or the internal PWM driving signal to output to the output unit. | 03-21-2013 |
20140070748 | METHOD AND CONTROL UNIT FOR DETECTING A BLOCKED ELECTRIC MACHINE IN AN ELECTRIC VEHICLE - The invention relates to a method and a control unit, which makes it possible to reliably detect in an electric vehicle whether or not an electric machine is in a blocked state. For this purpose, a current rotational speed of the electric machine ( | 03-13-2014 |
20150295523 | FAN MOTOR CONTROL DEVICE - A fan motor control device is provided in which in a situation where a control unit ( | 10-15-2015 |
20160036356 | Method for Starting a Variable-Speed Electric Motor - The invention relates to a method for starting a variable-speed electric motor, wherein upon detection of locking of the motor shaft a positive torque is applied to the motor shaft, and wherein the positive torque is continuously modified with different frequencies to overcome the locking. | 02-04-2016 |
20160079887 | ELECTRIC TOOL - An electric tool includes: a motor configured to be driven by PWM controlling a semiconductor switching element; a trigger configured to adjust startup and rotation of the motor; a changeover switch configured to switch a rotation direction of the motor between a forward rotation and a reverse rotation; a power transmission mechanism configured to rotate a tip tool by the motor, and a controller configured to control rotation of the motor. When the reverse rotation is set by the changeover switch, the controller PWM controls the semiconductor switching element at a high duty ratio after the trigger is pulled to drive the motor, and thereafter drives the motor at a state where the high duty ratio is changed to a low duty ratio. | 03-17-2016 |