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9030136 Motor controlling apparatus  
A motor controlling apparatus including an inverter, a voltage detector, a rotational speed detector, a command value calculating component, an inverter controller, a state detector and an...
9018889 Hardware-based, redundant overvoltage protection  
A generator system includes a generator and a generator control unit (GCU). The GCU is connected to monitor and regulate the generator output voltage. The GCU includes a protection signal...
9000701 Methods, systems and apparatus for generating voltage commands used to control operation of a permanent magnet machine  
Methods, systems and apparatus are provided for generating voltage commands used to control operation of a permanent magnet machine. For example, a control system is provided that generates...
8829829 Apparatus for calculating rotational position of rotary machine  
In a system, a superimposing element sets a command value vector of a high-frequency voltage signal and superimposes the high-frequency voltage signal with the command value vector on an output...
8810170 Methods and apparatus for electric motor controller protection  
A method for monitoring input power to an electronically commutated motor (ECM) is described. The method includes determining, with a processing device, an average input current to the motor, the...
8773049 System for use in controlling motor torque and method of assembling same  
A method of assembling an electric drive system includes providing a power conversion assembly and coupling an electric power source and a motor to the power conversion assembly. The method also...
8766589 Motor control unit and vehicle steering system  
In a motor control unit, a current-carrying failure detection unit determines a first determination condition and a second determination condition. The current-carrying failure detection unit...
8749184 Control apparatus for electric motor  
A control apparatus for an electric motor provided with a rotator having a permanent magnet and with a stator for generating a rotating magnetic field by an applied voltage and revolving the...
8742767 Parameter estimation system and method for an induction motor  
A method of estimating stator resistance of an induction motor includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the...
8736220 Inverter control device and power conversion device  
A DC voltage value from a DC voltage detection section is input directly to a voltage correction section without passing through a compensator or a filter. Therefore, even when rapid voltage...
8681457 Power source system for electric powered vehicle and control method therefor  
Relays are inserted and connected between a battery and a boosting converter, and other relays are inserted and connected between another battery and another boosting converter. A controller...
8653781 Variable frequency drive and rotation speed searching apparatus for an induction motor  
Provided is a variable frequency drive and a rotation speed searching apparatus for an induction motor incorporated therein. The rotation speed searching apparatus is featured by scanning the...
8624542 Methods and systems for controlling a multiphase electromagnetic machine  
A multiphase electromagnetic machine may be controlled by controlling currents in one or more phases of the multiphase electromagnetic machine. A control system may be used to determine how much...
8624533 Inverter power generator  
An inverter includes a voltage command generator generating a voltage command value according to an externally specified voltage value, a PWM signal generator generating a PWM signal according to...
8558490 Estimation of actual torque in an electrical motor drive  
It is presented a control device for driving an electric motor, wherein a drive control signal for the electric motor is arranged to be determined using a calculated rotor flux. A direct...
8558500 Control system for AC motor  
A control system for an AC motor determines a slope Ktl of a tangent TL at an operating point Pa corresponding to the current motor operating state and voltage phase (θ0) on a torque...
8541967 Steering control apparatus  
A steering control apparatus includes a direct current power source, a three-phase alternating current motor, and a motor driving circuit. An emergency switching element is provided on at least...
8497649 Motor driving control apparatus for controlling motor output according to power characteristics of AC power supply  
A motor driving control apparatus includes a motor driving unit which drives a motor and a driving control unit which supplies to the motor driving unit a command value for the motor driving unit...
8482245 Power conversion device  
A power conversion device in which an inverter for controlling a load is connected to an alternating current power system, and arranged to perform an electric power assist by connecting a...
8446117 Methods, systems and apparatus for adjusting duty cycle of pulse width modulated (PWM) waveforms  
Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase...
8405332 Method to eliminate current surge during spindle spin up  
Systems, methods and computer program products for reducing or removing current spikes generated during a current recirculation period associated with phase switching in a spindle motor are...
8390241 Motor drive based on III-nitride devices  
An inverter for driving a motor includes one or more power stages for producing one or more power signals for energizing the motor, each power stage including first and second III-nitride based...
8354810 Electric power steering device  
An electric motor is driven with high output at the time of low-speed running, and a steering at a high resolution is enabled at the time of fast-speed running. An electric power steering device...
8350516 Electric motor drive device and method of controlling the same  
A control device controls a switching operation of a switching element such that an AC voltage allowing an AC motor to output torque in accordance with a torque command value is applied to a coil...
8319461 Method and control system for controlling a brushless electric motor  
The present invention relates to a method and a system for controlling a permanent magnet excited, brushless, electronically commutated, three-phase electric motor (2) wherein a single-phase main...
8305029 Fan drive apparatus and image forming apparatus having fan drive apparatus  
A fan drive apparatus includes a first fan, a second fan configured to form an air flow space, which has an intake side and an exhaust side, in cooperation with the first fan, a first drive...
8283885 Driver circuit  
A drive control signal is effectively obtained. An offset control circuit (32) adds an offset to a rotational state signal. An added signal is obtained by adding an offset to the rotational state...
8278861 External disturbance detection system and method for two-phase motor control systems  
A system includes a power control module, a period determination module, and a control module. The power control module controls current through stator coils of a motor to rotate a rotor. The...
8242722 Controller for rotating electrical machines  
A controller for rotating electrical machines comprises a processing unit, to which a plurality of parameters are input, for generating a switching instruction to control a switching operation of...
8222849 Motor control method for MDPS system  
A motor control method for an MDPS system makes it possible to provide smoother and easier steering operation at a low cost by improving the OHP performance while supplying appropriate controlling...
8148927 Alternating-current motor control apparatus  
A control apparatus for an alternating-current motor that is driven by an inverter includes a rectangular wave voltage control portion that generates a control command of the inverter such that...
8138712 Motor drive system and its control method  
A ripple detection unit detects a ripple current width of a motor current controlled according to PWM control. A ripple reference setting unit sets a reference value of the ripple current width. A...
8076896 Inverter controller and method for operating the same  
An inverter controller comprising an AC motor as a load. A rectifying circuit converts AC power from an AC power source into DC power. A smoothing capacitor smoothens a DC voltage from the...
7969039 Method of controlling fuel cell vehicle and method of controlling DC/DC converter apparatus  
A controller is capable of executing direct couple control that directly couples a first power device and a second power device without causing a DC/DC converter to convert voltage. During the...
7948204 Sensorless speed detection of a PM brushless motor with phase terminals shorted  
According to one disclosed embodiment, a gate driver circuit for sensorless speed detection and driving a switching stage includes high side and low side switches series connected across a DC bus...
7911162 Motor drive device and control method  
A motor drive device (100) includes a boost converter (12) boosting a power supply voltage and outputting a boosted voltage; an inverter (14) receiving the boosted voltage from the boost converter...
7911173 Open loop method for controlling power  
A method of power control for an electrical motor using open-loop principles is disclosed. The method employs a desired control line function that determines hold-off time based on a detected...
7898197 Motor control device  
A motor control device includes a motor current detector for detecting motor current flowing in a three-phase motor based on current flowing between an inverter driving the motor and a DC power...
7876064 Motor drive inverter that includes III-nitride based power semiconductor devices  
An inverter for driving a motor includes one or more power stages for producing one or more power signals for energizing the motor, each power stage including first and second III-nitride based...
7868581 Induction motor analysis and control method  
An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power...
7852027 Method and circuit for testing motor  
A method for testing a motor having a rotor and a winding is provided. The method includes steps of (a) providing a power to rotate the rotor to a predetermined speed, (b) removing the power, (c)...
7835630 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,...
7800338 Method of decelerating alternating current motor and inverter apparatus  
A voltage type inverter apparatus comprising a voltage correcting portion. The voltage correcting portion corrects a given voltage instruction based on a value generated by passing a direct...
7723945 Control device for motor drive system and electric vehicle including the same  
A square wave voltage having an amplitude equal to an output voltage of a converter is applied to an AC motor by a square wave control block. Torque control of the AC motor is performed basically...
RE41303 Load driver and control method for safely driving DC load and computer-readable recording medium with program recorded thereon for allowing computer to execute the control  
In regenerative braking mode, an inverter converts, according to PWMC signal from a control unit, an AC voltage generated by a motor into a DC voltage to supply the converted DC voltage to an...
7710067 Power supply system and power supply system control method  
A power accumulating unit of a power supply system includes a first switch section configured to achieve a first voltage output state in which an output voltage is substantially equal to a first...
7701165 Induction motor controller  
An induction motor controller that may include three phase paths leading from a power input to a power output, a solid-state switching device interposed between the power input and the power...
7671558 Induction motor controller  
The present invention provides an induction motor controller which includes: a circuit for generating a d-axis current reference signal from a d-axis current command value and a periodically...
7671557 Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods  
Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting...
7654756 Actuator drive circuit and actuator device  
An actuator drive circuit includes a counter starting counting of a frequency-divided clock obtained by dividing a frequency of a reference clock in response to an activation signal, a D/A...

Matches 1 - 50 out of 378 1 2 3 4 5 6 7 8 >