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| Number | Title | Issue Date |
| 8143839 | Alternating-current motor control apparatus An alternating-current motor control apparatus includes a stator frequency computing unit configured to compute a stator frequency of a motor magnetic flux; a torque error computing unit configured to compute a torque error by using the motor magnetic flux, an estim... | 03/27/2012 |
| 8125179 | Controlling a power of an electrical motor A motor control circuit (MC) comprising input terminals (IT1, IT2) to receive a rectified input voltage (Vrm), and output terminals (OT1, OT2) to supply a motor drive signal (Vm). A switching circuit (1) is alternately in an on-sta... | 02/28/2012 |
| 8106621 | Control device for induction motor A control device includes a slip calculator that calculates a first slip frequency of an induction motor, a current detector that detects motor current that passes through the induction motor, an adder that calculates a primary frequency by adding a speed command an... | 01/31/2012 |
| 8054033 | Brushless, three phase motor drive A control method for a sensor-less, brushless, three-phase DC motor. A pulse-width modulation (PWM) duty cycle may be calculated. A voltage induced by rotation of a rotor may be sampled at a first expected zero crossing value to produce a first sampled voltage value... | 11/08/2011 |
| 8044618 | Control apparatus for AC motor It is attained by being provided with a motor constant calculation unit for calculating electric constants of a motor, and by correcting setting values of electric constants defined on one of the axes of two orthogonal axes, by a functional expression using a state ... | 10/25/2011 |
| 8013565 | Motor control device, control method, and control program The temperature of a stator coil is measured by a temperature sensor (14), amplified by a stator coil temperature amplifier (21), and transmitted to a vehicle control section (23). Further, motor cooling oil (17) for cooling the outer per... | 09/06/2011 |
| 8008886 | Power converter A power converter is provided with a rectifying circuit, an inverter circuit, and a common mode filter including a common mode choke coil and a capacitor. The switching frequency of a PWM rectifying circuit is set at three times the switching frequency of a PWM inve... | 08/30/2011 |
| 7948206 | Assembly comprising a three-phase machine and a frequency converter Disclosed is an assembly encompassing a three-phase machine and a frequency converter. Said assembly has the following characteristics: the three-phase machine comprises a stator and a rotor; at least the three circuits of the stator and/or the rotor can be operated... | 05/24/2011 |
| 7923961 | Vehicle equipped with motor and inverter A vehicle includes a motor for driving wheels WH, an inverter to drive the motor, and a control device to perform PWM control of the inverter. The control device performs synchronous PWM control in a case where an electric current supplied to the motor by the invert... | 04/12/2011 |
| 7911177 | AC motor drive controller An overmodulation PWM controller includes a voltage instruction calculation unit which calculates a d axis voltage instruction and a q axis voltage instruction in which a voltage amplitude exceeds a peak value of a triangular wave carrier; a voltage instruction corr... | 03/22/2011 |
| 7898211 | Driving circuit for motor and device equipped with driving circuit The circuit structured to drive a motor is provided. The circuit includes: a division signal generator that generates a division signal dividing each of a high level period and a low level period of a binary position signal representing a relative position of a magn... | 03/01/2011 |
| 7898210 | To obtain the three-phase current via adjusting width of pulses with single DC-link current sensor After an AC motor generates a three-phase current, modulate the three-phase current to generate an original voltage space vector, and add three detecting vectors with a sum of zero after the original voltage space vector. While adding the three detecting vectors, sa... | 03/01/2011 |
| 7893650 | Method and system for multiphase current sensing A multiphase current sensing method wherein the sum of the phase currents is zero including: sensing a.c. and/or d.c. currents in first and second phases; sensing a.c. current in a predetermined a.c. frequency range in a third phase; and combining the current sensed... | 02/22/2011 |
| 7880428 | Controller for induction motor A controller for an induction motor includes a storage device which stores values in a plurality of addresses, a first counter which transits circularly among first to N-th states, a second counter which transits circularly among first to fourth states, a calculatin... | 02/01/2011 |
| 7880427 | Method for operation of a two-stranded electronically commutated motor, and motor for carrying out said method A two-stranded electronically commutated DC motor has a permanent-magnet rotor (36), power supply terminals (28, 30) for connecting the motor to a current source (22) and a stator (102) having a winding arrangement which includes first an... | 02/01/2011 |
| 7852028 | Voice coil motor control system and method Analog control of the pulse width used to control the speed of a voice coil motor may be implemented using a “constant-current-charging-capacitor” configuration where the time needed to charge the capacitor is directly related to how far the actual motor speed i... | 12/14/2010 |
| 7825622 | Load driving method and device A load driving device controls two motors by PWM signals. When a standard duty ratio of the PWM signals is 50% and a level of a drive instruction is the standard duty ratio, the standard duty ratio are output to the respective motors to provide a reverse phase relat... | 11/02/2010 |
| 7812564 | Blower and electric device with such blower mounted thereon A supply current control circuit controls the voltage of a low-voltage direct-current power source so that the average current of an inverter circuit detected by a current detecting circuit becomes constant at a specified current value. Accordingly, characteristics ... | 10/12/2010 |
| 7768228 | Method and system for converting DC power to AC power Methods and systems for converting direct current (DC) power to alternating current (AC) power are provided. A first phase of the AC power is generated based on a first carrier signal. A second phase of the AC power is generated based on a second carrier signal.... | 08/03/2010 |
| 7755320 | Integrated circuit for driving motor A motor driving integrated circuit includes a data receiving circuit, a control circuit, and a pulse generating circuit. The data signal receiving circuit receives data signals inputted via a data signal input terminal. The control circuit controls the motor driving... | 07/13/2010 |
| 7750596 | Semiconductor device, motor drive device and air conditioning machine The semiconductor device according to the present invention generates pulse width modulation signals for controlling inverter circuits that drive a motor. The semiconductor device includes: a first register which holds values for determining a period in which each p... | 07/06/2010 |
| 7741798 | RFI/EMI filter for variable frequency motor drive system An RFI/EMI filter for a variable frequency motor drive system includes a variable frequency drive; a common mode choke; a motor; a cable including a plurality of power leads interconnecting the motor with the variable frequency drive and passing through the choke; a... | 06/22/2010 |
| 7723946 | Method and system for pulse position scheduling in electric drives Method and system are provided for controlling an alternating current (AC) motor via an inverter. The method includes selecting a pulse sequencing method based on a modulation index of the inverter, and providing a voltage to the AC motor based on the pulse sequenci... | 05/25/2010 |
| 7679309 | Method and system for motor control with delay compensation Methods and systems are provided for controlling an electric machine via an inverter while compensating for one or more hardware delays. The method includes receiving a control signal, producing a first sampling signal based on the control signal, and adjusting the ... | 03/16/2010 |
| 7679310 | Method and system for controlling pulse width modulation in a power inverter in electric drives Methods and systems for controlling a power inverter in an electric drive system of an automobile are provided. The various embodiments control the power inverter by, responsive to either a commanded torque of the electric motor being above a first torque level, or ... | 03/16/2010 |
| 7663337 | 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... | 02/16/2010 |
| 7659689 | Power conversion apparatus and method and automobile An apparatus and method for supplying a polyphase (AC) alternating current motor with driving voltages. A conversion unit is coupled to phases of the polyphase AC motor and includes a plurality of switching devices and includes, in at least one phase, a first switch... | 02/09/2010 |
| 7609024 | Auxiliary bus method Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power fro... | 10/27/2009 |
| 7605556 | Microcontroller methods of improving reliability in DC brushless motors and cooling fans A method of controlling a motor speed for a fan assembly includes receiving a duty cycle value at a microcontroller. The microcontroller receives a measured fan speed from a speed sensor. An expected fan speed is determined, where the expected fan speed corresponds ... | 10/20/2009 |
| 7595605 | Method and control circuit for determining an operating state when controlling a fan motor A method is described for determining an operating state on triggering a fan motor, the fan motor being operated with the aid of a switching device, the switching device being activated via a pulse-width-modulated triggering signal, a pulse duty factor of the trigge... | 09/29/2009 |
| 7589490 | Motor control system for the PWM control of an electric motor The subject of the present invention is a motor control system having a monitoring circuit for monitoring PWM control for a DC electric motor, the PWM control comprising a power end stage having at least one field effect transistor, which controls the current at the... | 09/15/2009 |
| 7586287 | Computer housing temperature control device A computer housing temperature control device is disclosed. The present invention obtains the PWM signal generated from the CPU in the motherboard to control the rotation speed of all cooling fans located in the computer housing. Furthermore, the present invention u... | 09/08/2009 |
| 7560897 | Current controller and current offset correction To provide a current controller capable of constantly detecting an offset value of a current detection system, the offset value overlapping with a current detection value, in a state of regular operation of a motor to correct the current detection value and capable ... | 07/14/2009 |
| 7538515 | Motor controller A motor controller includes an inverter circuit, a speed detector, an amplifier, a voltage detector, and an offset voltage addition circuit. The inverter circuit drives a motor based on a PWM signal. The speed detector generates an actual speed signal corresponding ... | 05/26/2009 |
| 7521883 | Motor current shaping A method and apparatus is disclosed for generating a drive signal that is applied to a coil in a motor. The drive signal is applied during a period (commutation period) between a commutation event and the immediately following commutation event when the coil is ener... | 04/21/2009 |
| 7518335 | Method and apparatus for PWM control of voltage source inverter to minimize current sampling errors in electric drives A method for controlling an alternating current (AC) motor includes choosing a pulse sequence based on a ripple current in the AC motor at a sampling instant; and providing a voltage to the AC motor based on the pulse sequence. ... | 04/14/2009 |
| 7495412 | Motor driving using discrete time oscillator A pulse width modulator includes a discrete time oscillator, a data storage device, a data processing block, a counter, and a comparator. The discrete time oscillator generates a first address of bits used by the data processing block for reading first data from the... | 02/24/2009 |
| 7479757 | System and method for a cooling system Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power fro... | 01/20/2009 |
| 7449854 | PWM signal generation apparatus and method thereof and motor control apparatus and method thereof A PWM signal generation of the present invention includes a counter, a compare register, a comparator comparing a compare value of the compare register with a count value of the counter and outputting an identity signal, a PWM signal generation circuit determining a... | 11/11/2008 |
| 7449860 | Control technique for limiting the current of an induction machine drive system A method and apparatus for deriving phase voltage control signals for use in controlling current flow to an induction motor. The method may comprise obtaining an error term; converting the error term into a commanded voltage value; transforming the commanded voltage... | 11/11/2008 |
