Class / Patent application number | Description | Number of patent applications / Date published |
318400020 |
Vector control (e.g., dq-axis control, 3-2 phase conversion, etc.)
| 348 |
318400320 |
Sensorless feedback circuit
| 278 |
318400260 |
Switching circuit structure or component (e.g., inverter, bridge circuit, etc.)
| 258 |
318400040 |
Specific processing of feedback signal or circuit therefore (i.e., A-D conversion, compression, or modification)
| 249 |
318400090 |
Plural mode control (e.g., open and closed loop, starting and braking, plural-phase and single-phase operation, open and closed loop, etc.)
| 224 |
318400210 |
Having protection means (e.g., switching circuit protection, stall protection, failure to start, "wrong" direction, etc.)
| 220 |
318400300 |
Power supply voltage feature (e.g., power supply voltage, Vcc compensation, rectifier circuit, power regulator, auxiliary or secondary power supply, etc.)
| 188 |
318400130 |
With timing, delay, or clock pulse counting circuit or generation
| 163 |
318400370 |
With sensor structure (e.g., tachometer, reed switch, cam-controlled switching, etc.)
| 84 |
318400230 |
Torque ripple stabilization or acoustic noise attenuation (e.g., cogging prevention, etc.)
| 76 |
318400150 |
With torque or load determination (e.g., by calculation, detection, or estimation, etc.)
| 60 |
318400170 |
Modification or waveshaping of switching control signal (e.g., switching control input to inverter, etc.)
| 47 |
318400200 |
Phase voltage wave-shaping circuit or method (e.g., output from inverter, phase energizing signal, trapezoidal wave, etc.)
| 35 |
318400240 |
Electrical noise attenuation (e.g., EMI, EMR, RFI, etc.)
| 34 |
318400410 |
Having specific motor structure (e.g., bifilar windings, airgap dimension, auxiliary winding, phase winding with midtap, etc.)
| 16 |
318400030 |
Plural reference comparison (e.g., reference changes during startup, upper/lower reference, etc.)
| 13 |
318400190 |
Slew rate control (e.g., slew limiting, etc.) | 5 |
20090072775 | METHOD AND APPARATUS FOR QUIET FAN SPEED CONTROL - An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change the speed of the motor, a control circuit renders a first switch conductive, in response to a first detected AC voltage zero crossing, to charge a first capacitor to a predetermined voltage. The control circuit then renders a second switch conductive, in response to a subsequent second detected AC voltage zero crossing, to charge a second capacitor to the predetermined voltage. The control circuit then renders both switches simultaneously conductive at a predetermined time after a subsequent third detected AC voltage zero crossing. The capacitors will thereby be charged to the same voltage prior to being switched into series with the motor, thereby resulting in reduced acoustic noise when changing motor speeds. | 03-19-2009 |
20090121666 | FREQUENCY CONVERTER, MOTOR, MOTOR DRIVE SYSTEM AND MAINTENANCE METHOD FOR MOTOR DRIVE SYSTEM - A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing for supporting at least the inverter unit and control unit, wherein a rise time change unit is provided in the housing, the rise time change unit changes a rise time of a waveform of a voltage output from the inverter unit. | 05-14-2009 |
20090134824 | BLDC MOTORS - A 2-phase BLDC motor is driven by a trapezoidal waveform. For one-half of the motor rotation period T, the phase is driven by the trapezoidal waveform and for the other half-period, the coil remains undriven. Accordingly, if the optimum slope duration is around 10% of the duration of the driven portion, then it is of the order of T/20. An up down counter is operable to increment at a first frequency f | 05-28-2009 |
20100019708 | Brushless motor and control method of brushless motor - In a brushless motor having a stator including armature windings for a plurality of phases, and a rotor including a permanent magnet and being rotatably disposed inside or outside of the stator, an inter-phase induced voltage waveform between two different phases in the armature windings is a trapezoidal waveform formed by superimposing a fifth-order component and a seventh-order component on a first-order fundamental wave. A content rate X(=(α | 01-28-2010 |
20130113401 | PWM SIGNAL OUTPUT CIRCUIT - A PWM-signal-output circuit includes a detecting unit to detect time periods during which a speed signal with logic level changing alternately and having a period corresponding to a motor-rotation speed is at one and the other logic levels; a generating unit configured to, when the logic level of the speed signal changes, generate a signal to increase and thereafter decrease a current flowing through a motor coil within a first time period detected by the detecting unit, in a second time period occurring after the first time period; and a second generating unit configured to, when the first time period has elapsed after a change in the logic level of the speed signal but before a subsequent change in the logic level thereof in the second time period, generate the signal from when the first time period has elapsed until when the logic level thereof changes. | 05-09-2013 |
318400180 |
With manual control (e.g., foot switch, surgical tool, etc.) | 4 |
20090134823 | MULTI-LEVEL PROGRAMMING OF MOTOR 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 |
20120293099 | ELECTRONIC SWITCHING MODULE FOR A POWER TOOL - An electronic power apparatus is provided, including a circuit board having a conductive pads and a sense pad coupled to an output signal, and an actuator having a wiper portion accommodating a conductive wiper. The wiper includes a first end arranged to engage the sense pad and a second end arranged to slidably engage at least one of the conductive pads on the circuit board. The conductive pads are arranged in a first row of conductive pads and a second row of conductive pads in parallel with and at a distance to the first row of conductive pads. An alignment of the second row of conductive pads is offset with respect to the first row of conductive pads. | 11-22-2012 |
20130320893 | ELECTRIC POWER STEERING APPARATUS - When a current sensor fails, instead of a normal-time motor control section, an abnormal-time motor control section drives and controls a motor. The abnormal-time motor control section detects a timing at which motor current becomes zero in a state in which all the switching devices are turned off. Every time the motor current becomes zero, the abnormal-time motor control section sets an ON time corresponding to steering torque, and turns on the switching devices corresponding to the direction of the steering torque for the ON time. With this operation, an average current corresponding to the steering torque flows through the motor, whereby deterioration of the followability of steering assist is suppressed. | 12-05-2013 |
20160204718 | ELECTRIC TOOL | 07-14-2016 |
318400310 |
Utilization or dissipation of stored or collapsing field energy (e.g., freewheeling, discharging one winding through another, etc.) | 4 |
20090146596 | Voltage clamping and energy recovery circuits - A circuit for use with a stator winding of a rotating or linear electrical machine, the stator winding having a number of coils linked by the same number of points of common coupling, includes an electronic commutator circuit having the same number of switching stages, each connected between a respective one of the points of common coupling and first and second main dc lines. Each switching stage includes first and second reverse blocking semiconductor power devices. A voltage clamping circuit includes the same number of clamping stages, each connected between a respective one of the points of common coupling and first and second auxiliary dc lines. Each clamping stage includes first and second diodes and first and second capacitors common to the various clamping stages. A dc to dc converter selectively discharges the first and second capacitors to the first and second main dc lines. | 06-11-2009 |
20090309527 | METHOD AND SYSTEM FOR DYNAMIC MOTOR BRAKING - A method of dynamic motor braking is disclosed herein. The method comprises: dissipating reverse energy in a motor within motor windings during a non-current supplying period of a commutation sequence by intermittently shorting the motor windings. The motor windings are shorted by simultaneously turning on all switches that are connected to a voltage source or to ground in a three-phase bridge motor control. | 12-17-2009 |
20100134059 | BRUSHLESS MOTOR APPARATUS - A blushless direct current (BLDG) motor apparatus includes: a stator which is provided with a plurality of windings corresponding to N phases and wound in parallel independently of each other; a rotor which has a plurality of poles corresponding to the plurality of windings and rotates with respect to the stator by excitation of the windings; a switching unit which is provided in the form of a full H-bridge with respect to each phase, comprises a pair of upper switching devices corresponding to a (+) side of the winding and a pair of lower switching devices corresponding to a (−) side of the winding, and performs a switching operation to supply or not to supply driving power to the winding; a first sensing device which senses the phase of the rotor with respect to the stator to determine whether to turn on or off the upper switching device; a second sensing device which is provided in the latter part than the first sensing device and senses the phase of the rotor with respect to the stator to determine whether to turn on or off the lower switching device; and a controller which uses a partial square wave to drive the upper switching device and the lower switching device on the basis of the sensed phase of the rotor, and controls the lower switching device to be turned off later than the upper switching device by more than a time to exhaust an electric current staying in the winding. | 06-03-2010 |
20110101902 | BRUSHLESS ELECTRIC MACHINE - The brushless electric machine includes a first drive member ( | 05-05-2011 |
Entries |
Document | Title | Date |
20080265814 | Method of controlling seatbelt retracting device with motor - In controlling a seatbelt retracting device having a mechanism for retracting a seatbelt with a motor, a current flowing to the motor is detected, and a rate of increase in the current is calculated. The motor is stopped when the rate of increase in the electricity exceeds a predetermined rate and when the electricity exceeds a predetermined value, respectively. | 10-30-2008 |
20080303462 | METHOD FOR OPERATION OF A THREE-PHASE ROTATING ELECTRICAL MACHINE, AND AN APPARATUS FOR CARRYING OUT THE METHOD - A method and apparatus are provided for operation of a three-phase rotating electrical machine which has at least two stator winding sets and each stator winding set has three phase windings connected in star, and the star circuits of the stator winding sets have a phase shift of 30 degrees electrical with respect to one another, and an associated converting unit is respectively provided for each stator winding set, in which method the respective stator winding set is fed by the associated converter unit, and a respectively associated regulation device is provided for each converter unit, and each converter unit is driven by means of a drive signal from the associated regulation device independently of regulation devices of the respective other converter units. | 12-11-2008 |
20090066275 | BRUSHLESS ELECTRIC MACHINE AND APPARATUS USING THE SAME - A first member has a magnet assembly that includes at least one permanent magnet pair, and a second member includes an electromagnetic coil. A control circuit controls the supply of power to the electromagnetic coil as well as regeneration of power from the electromagnetic coil. The permanent magnet pair generates its strongest magnetic field along a magnetic field direction on homopolar contact planes where first magnetic poles contact one another, outward from the center of the permanent magnet pair along the magnetic field direction. The electromagnetic coil is positioned such that current will flow in a direction intersecting the magnetic field direction. | 03-12-2009 |
20090128067 | INTERFACE CORD AND SYSTEM INCLUDING AN INTERFACE CORD - An interface cord is operable to connect an external controller to an electrical machine. The interface cord includes a first connector having a first pin configuration, a cable coupled to the first connector, a second connector coupled to the cable and having a second pin configuration different from the first pin configuration, and a circuit board with a programmable electrically coupled in circuit between the first connector and the second connector. | 05-21-2009 |
20090128068 | INTERFACE CORD AND SYSTEM INCLUDING AN INTERFACE CORD - An interface module is operable to download data from an electrical machine. The interface module includes a cable for transferring data, the cable having a first connector at a first end thereof, a circuit board having a programmable device electrically coupled in circuit to the cable, and a memory connected to the circuit board and configured to store data related to the operating characteristics of the electrical machine. | 05-21-2009 |
20090230899 | CONTROL APPARATUS FOR POWER CONVERSION APPARATUS AND POWER CONVERSION SYSTEM - The control apparatus for a power conversion apparatus having chopper circuits and a capacitor, each of which includes a switching circuit and a coil, the switching circuit being on/off-controlled in accordance with specific timings determined in accordance with a current flowing through the coil to create required voltage in the capacitor, includes a function of evenly dividing an interval between adjacent specific timings of one of the chopper circuits to produce divided timings to be allocated to the other chopper circuits, and a function of setting, for each of the other chopper circuits, an on-time period of the switching circuit such that, when the interval varies as a result of which the specific timing of each of the other chopper circuits deviates from a corresponding one of the divided timings, an interval between adjacent specific timings of each of the other chopper circuits is varied to reduce the deviation. | 09-17-2009 |
20090278481 | APPARATUS AND SYSTEM FOR EFFICIENTLY CONTROLLING A HUB MOTOR - An apparatus, system, and method are disclosed for an efficient hub motor. A stator is attached to a shaft. Coils are embedded in the stator in a circular pattern. Two rotors are rotatably coupled to the shaft with the stator between them. Permanent magnets are embedded in each rotor. Each permanent magnet and each core has a similar cross-sectional shape. The permanent magnets are positioned in a circular pattern corresponding to the coils. The permanent magnets are positioned so that when a coil aligns with a permanent magnet a next coil aligns between two magnets. Shorting bars connect exterior edges of the permanent magnets. A sequence control connects each coil so that current flows in a coil in one direction and the sequence control disconnects the coil and reconnects the coil with current flowing in the opposite direction in response to a set of permanent magnets aligning with a coil. | 11-12-2009 |
20090289583 | MOTOR DRIVE DEVICE AND VEHICLE PROVIDED WITH THE SAME - A control device converts a torque instruction value of an AC motor into a current instruction of AC motor, and employs current control in which feedback is performed by PI control to match an actual current value with the current instruction. Further, the control device sets a target flow rate of cooling water flowing through a coolant passage based on the converted current instruction, produces a signal for driving a water pump to circulate the cooling water at the target flow rate thus set and provides the signal to the water pump. A revolution speed of the water pump is restricted according to a signal of the control device such that the cooling water circulates through the coolant passage at the flow rate matching with the target flow rate. | 11-26-2009 |
20100102764 | METHODS, SYSTEMS, AND DEVICES FOR A MOTOR CONTROL SYSTEM - Systems, devices, and methods for controlling a motor are disclosed. A method may include determining a rotational direction of a motor from a pair of quadrature signals sent to a microprocessor. The method further includes adjusting an internal count stored in the microprocessor at each edge of each of the pair of quadrature signals. The method further includes adjusting an external count stored in the microprocessor and transmitting an interrupt to a main controller after the first phase signal and the second phase signal have transitioned through each combinational logic state in one of a forward rotational direction and a reverse rotational direction. The method further includes transmitting a signal comprising the rotational direction of the motor and the external count from the microprocessor to a main controller. | 04-29-2010 |
20100181947 | DRIVER FOR A BRUSHLESS MOTOR, SYSTEM COMPRISING A DRIVER AND A BRUSHLESS MOTOR AND A METHOD FOR DRIVING A MOTOR - A driver (DR) for a brushless motor comprises at least three outputs (O | 07-22-2010 |
20110057589 | COMPUTER FAN CONTROL SYSTEM - A system of computer fan control reduces vibration values and prominence ratios of a number of computer fans. A control chip outputs a phase setting control instruction to a PWM chip. The PWM chip outputs a number of out-of-phase PWM signals to rotate the number of computer fans according to the phase setting control instruction. | 03-10-2011 |
20110227515 | CONTROL APPARATUS FOR ELECTRIC ROTATING MACHINE - The control apparatus for an electric rotating machine includes a prediction section to predict a controlled variable of the electric rotating machine applied with an output voltage of a power conversion circuit for each of prescribed operation states of the power conversion circuit, and a manipulation section to manipulate the power conversion circuit to operate in one of the respective operation states determined as an actual operation state based on the controlled variable predicted by the prediction section. The control apparatus further includes an average voltage direction calculating section to calculate a direction of an average output voltage vector of the power conversion circuit. The manipulation section includes a priority setting section to set priority for each of the operation states based on the direction of the average output voltage vector calculated by the average voltage direction calculating section in determining the actual operation state. | 09-22-2011 |
20120068638 | METHOD AND AMPLIFIER FOR OPERATING A SYNCHRONOUS MOTOR - A method for operating a synchronous motor wherein a magnetic field is generated by a first motor component in a predetermined orientation, the method including generating a relative movement between the first and a second motor component limited to a predetermined value, and determining a direction of the relative movement, wherein the generating and determining are repeated until a change in the direction of the relative movement occurs, wherein a magnetic field having a changed orientation with regard to a previously generated magnetic field is generated by the first motor component, and wherein the orientation of the magnetic field with the changed orientation is changed by a predetermined orientation section and depending on the determined direction of the relative movement. The invention encompasses an amplifier for operating a synchronous motor and a system including an amplifier and a synchronous motor. | 03-22-2012 |
20120139458 | SYSTEM FOR CONTROLLING A MOTOR OF VEHICLE - A system for controlling a motor of a vehicle that improves fuel economy by minimizing a sum of heat generated by the motor and heat generated by a converter, is disclosed. More specifically, a power source supplies DC electricity; a converter selectively receives and converts the DC electricity of the power source into inverter input voltage. A relay module selectively connects the power source to the converter and an inverter module receives the inverter input voltage from the converter, converts the inverter input voltage into 3-phase AC current, and supplies the 3-phase AC current to the motor. Further, a controller controls operations of the converter, the relay module, and the inverter module, to perform to minimize the inverter input voltage that is a sum of heat generated due to the flux-weakening control and heat generated due to suppression of the flux-weakening control. | 06-07-2012 |
20120274247 | DRIVE AND CONTROL CIRCUIT FOR MOTOR SYSTEM AND THE METHOD THEREOF - A drive and control circuit for motor system and the method thereof are disclosed. The motor system could be applied in a cooling device, wherein the motor system comprises a rotor, a coil and a bridge circuit. The drive and control circuit comprises a control unit, a state detecting circuit, a load determining circuit, and a startup setting circuit. The startup setting circuit makes the motor run with the maximum torque, thus to make the motor system start up easily and quickly. The load determining circuit detects the load of the motor system, thus to generate a load determining signal to determine the speed of the motor system. The control unit could be realized with few components so as to save the costs. | 11-01-2012 |
20130187578 | VEHICLE, AND CONTROL METHOD FOR VEHICLE - A control device includes a PWM control unit that executes PWM control over an alternating-current motor mounted on a vehicle. The PWM control unit includes an alarm sound generation processing unit that executes an alarm sound generating process of generating an alarm sound from the motor for informing a pedestrian, or the like, of the approach of the vehicle by intentionally varying phase current flowing through the motor by periodically adding a variation value (ΔV) to a d-axis voltage command value (Vd) at a predetermined interval. At the time of executing the alarm sound generating process, the alarm sound generation processing unit adjusts the variation value (ΔV) such that the d-axis voltage command value (Vda) resulting from the alarm sound generating process (the sum of Vd and ΔV) falls within a range in which it is possible to suppress occurrence of an overcurrent in the motor. | 07-25-2013 |
20130234631 | METHOD OF DETERMINING THE ROTOR POSITION OF A PERMANENT-MAGNET MOTOR - A method of determining the position of a rotor of a permanent-magnet motor. The method uses two different schemes to determine the position of the rotor. A first scheme is used when the rotor rotates within a first speed range, by sequentially exciting and freewheeling a winding of the motor, measuring a parameter that depends on the rate of change of current in the winding, and comparing the parameter against a threshold. A second scheme is used when the rotor rotates within a second speed range, by generating a voltage signal that is proportional to the voltage across the winding, generating a further voltage signal that depends on the rate of change of current in the winding, and comparing the two signals. | 09-12-2013 |
20130249447 | Synchronous Motor Controller, Synchronous Motor Control Method - A controller for a conventional synchronous motor is configured to produce desired output characteristics. The controller generates a drive current for based on a current command, has a motor correcting section and a gain adjusting section which output a compensated current command based on the current command according to a compensating transfer function for cancelling a first transfer function showing a first torque response characteristic of the synchronous motor and replacing it with a second transfer function showing a second torque response characteristic, and a current controller which generates a drive current corresponding to the compensated current command. | 09-26-2013 |
20140152202 | METHOD FOR CALCULATING MOTOR CONSTANT OF PERMANENT MAGNET TYPE SYNCHRONOUS MOTOR AND MOTOR CONSTANT CALCULATING DEVICE - A method for calculating a motor constant of a permanent magnet type synchronous motor according to the present invention includes: a voltage applying step of applying a voltage obtained by compositing a DC component and an AC component to a permanent magnet type synchronous motor while varying a frequency of the AC component; a current detecting step of detecting a motor current flowing according to the applied voltage; a phase difference calculating step of calculating a difference in phase between the AC component of the applied voltage and an AC component of the motor current; and a motor constant calculating step of calculating a motor constant of the permanent magnet type synchronous motor. In addition, in the motor constant calculating step, the motor constant is calculated based on the applied voltage and the motor current when the difference in phase becomes nearly 45 degrees. | 06-05-2014 |
20140354198 | ACTUATOR CONTROL DEVICE - An actuator control device includes an upper-level control unit that sets an upper-level target value of a predetermined control factor relating to driving an actuator, a lower level control unit, and an intermediate control unit. The lower-level control unit has a command input element that receives an input of the upper-level target value and outputs a lower-level target value of the predetermined control factor, an actuator control element that receives an input of the lower-level target value and controls the actuator, and a tracking element that causes an actual value of the predetermined control factor in the actuator to track the lower-level target value. The intermediate control unit causes the actual value of the predetermined control factor in the actuator to track the upper-level target value. The upper-level target value is inputted into the command input element of the lower-level control unit via the intermediate control unit. | 12-04-2014 |
20160020715 | SYSTEM AND METHOD FOR ADJUSTING AN OPERATION OF A MOTOR - A motor controller coupled to a motor is provided. The motor controller includes a processor, a memory coupled to the processor, a first input coupled to the processor, wherein the first input is associated with a first mode of operation, and a second input coupled to the processor, wherein the second input is associated with a calibration mode. The motor controller is configured to receive, through the first input, a first activation signal, operate the motor in the first mode of operation in response to receiving the first activation signal, while operating the motor in the first mode of operation, receive, through the second input, a second activation signal, in response to receiving the first activation signal and the second activation signal, adjust a value of a parameter associated with the first mode of operation, and store the value of the parameter in the memory. | 01-21-2016 |