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8169179 Open-ended control circuit for electrical apparatus  
An AC machine control system for an AC machine (motor, generator, transformer, etc.) having open-ended windings, the control system comprising a drive circuit configured to transfer AC power...
8159177 System for realizing rotor variable frequency speed control asynchronously and simultaneously by driving multiple motors via one inverter  
A system for realizing rotor variable frequency speed control asynchronously and simultaneously is disclosed. Multiple motors are driven via one inverter, which consists of a motor group, a...
8159162 Motor control apparatus, vehicle fan drive apparatus, and motor control method  
A motor control apparatus has a start control section. When the motor control apparatus receives a motor start command from a host control unit when a motor is in a stop state or a low-speed...
8154240 Control apparatus for electric railcar  
A control apparatus for an electric railcar includes an inverter that exchanges power with an AC rotating machine, a filter capacitor connected in parallel to a DC side of the inverter, a filter...
8148935 Machine with flywheel-less buffer drive  
A machine has a basic body and a machine element. The machine element can be moved relative to the basic body by an electric working drive which is connected to an electric supply system via a...
8148934 Voltage step-up/down converter  
A motor control apparatus includes a step-up/down converter and an inverter. The converter includes a coil, MOSFETs, capacitors and a control circuit. The control circuit turns on the MOSFET in...
8143840 Device for controlling induction motor  
A device for controlling an induction motor includes a voltage/frequency controller, a pulse width modulation controller, and a converter. The voltage/frequency controller receives a controlling...
8143837 Inverter control apparatus  
An inverter control apparatus includes: a state estimator that calculates an estimated current vector and an estimated magnetic flux vector from a motor command voltage vector, a detected current...
8143836 Motor controller  
A motor controller capable of effectively utilizing electrical energy accumulated in a capacitor and achieving a reduction in capacitance of the capacitor. The motor controller includes a...
8143828 Retrofit motor system for heating, ventilation, and air conditioning applications  
A motor control system for heating, ventilation, and air conditioning (HVAC) applications is described. The motor control system includes a thermostat and an electronically commutated motor (ECM)...
8143838 Phase current estimation apparatus for motor and magnetic pole position estimation apparatus for motor  
A phase current estimation apparatus for a motor capable of suitably improving estimation accuracy of phase currents is provided. The phase current estimation apparatus 10 of the motor includes a...
8138711 Motor controller of air conditioner and method of the motor controller  
The present invention relates to a motor controller for an air conditioner and a motor control method. The motor controller including a converter converting AC utility power into DC power and an...
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...
8134330 Electronic control of the pressure and flow of linear pumps and compressors  
A control circuit for linear motors driving pumps or compressors that provides a programmable pressure versus flow behavior. The duty cycle of a pulse width modulated drive signal to a coil in the...
8129936 Open-loop and/or closed-loop control system of a 3-phase power converter for the operation of an asynchronous machine  
An open-loop and/or closed-loop control device for operating an asynchronous machine which is fed by a 3-phase power converter. The open-loop and/or closed-loop control structure has a stator flux...
8125177 System and method for adding voltages of power modules in variable frequency drives  
Systems and methods for providing electrical power and to downhole oil production equipment such as electrical submersible pumps, wherein the outputs of multiple power modules are individually...
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...
8120306 Voltage source inverter with a voltage offset  
Methods and apparatus are provided for operation of a voltage source inverter. A method of operating a voltage source inverter having an output with multiple voltage phases having a DC voltage...
8115444 Common mode filter for motor controllers  
A motor drive circuit has a converter for coupling to an AC voltage source and an inverter coupled to the converter for providing a drive current for a motor. A common mode circulation loop is...
8106620 Vector control device for alternating-current electric motor  
There is provided a vector control device for an alternating-current electric motor having a damping controller which automatically calculates an optimum damping operation amount and does not...
8107241 Electric power conversion apparatus including cooling units  
In a conventional cooling device, a heat pipe or a circulation-type liquid cooler provided with a pump is used and therefore, a large space is needed for the cooling device. There is provided a...
8102143 Electric drive unit  
Electric drive units comprising a common active part having a stator and a rotor, which has windings and/or permanent magnets for a drive function and an energy transmission function, enable the...
8102142 Double ended inverter system for a vehicle having two energy sources that exhibit different operating characteristics  
A double ended inverter system for an AC electric traction motor of a vehicle is disclosed. The inverter system serves as an interface between two different energy sources having different...
8093858 AC line voltage conditioner and controller  
A voltage or power conditioning and control device may be used in line with a source of AC line power and a reactive load such as a single-phase induction motor. The device operates to absorb some...
8091665 Vehicle drive system and vehicle equipped with it  
A vehicle drive system comprises inverters connected electrically with a power supply line and a ground line and controlling the current flowing through each stator coil of each of first and...
8084985 Inverter control method  
Two current threshold values are adopted, which are larger than the upper limit of current of an operating region. When a rotating speed is smaller than a speed threshold value, the current...
8084976 Motor control device and compressor  
A motor control device performing vector control for a motor that drives a load whose load torque varies periodically. The motor control device has: a motor speed deriving portion estimating or...
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...
8076897 AC motor driving circuit and electric vehicle driving circuit  
In an AC motor driving circuit, a current source rectifier is provided on the output side of an AC generator and an AC motor is connected to the output side of the current source rectifier through...
8054032 Discontinuous pulse width modulation for double-ended inverter system  
Systems and methods are provided for controlling a double-ended inverter system having a first inverter and a second inverter. The method comprises determining a required output current and...
8054013 Electric power control device and vehicle with the same  
Power lines are connected to neutral points of motor generators, respectively, and an electric power is transmitted and received between a vehicle and a load outside the vehicle via the power...
8054012 Motor driving apparatus  
A motor driving apparatus having a converter, which receives AC voltage and converts it to DC power, and an inverter, which receives the DC power and converts it to AC power, includes a...
8054014 Control system for an electrical machine  
In a control system and a method for operating a permanent-magnet electrical machine, when the electrical machine is switched off after one of a functional computer and a monitoring computer of...
8044631 Power conversion systems and methods for controlling harmonic distortion  
Control systems, methods and power conversion systems are presented for controlling harmonic distortion, in which multi-sampling space vector modulation (SVM) is employed for controlling power...
8044633 Drive device of electric motor  
An electric motor has a field pole formed by a field current passing through a field winding. A voltage booting converter converts output voltage of a battery and outputs the voltage between a...
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...
8044632 Power conversion device  
A power conversion device includes a converter that converts AC power to DC power, a converter controller that controls an output voltage of the converter, an inverter that converts the DC power...
8040086 Current detector unit and motor control device  
A current detector unit has a current detecting portion detecting a current flowing between a three-phase inverter and a direct-current power supply as a detection current; a three-phase current...
8040081 Motor drive apparatus, hybrid drive apparatus and method for controlling motor drive apparatus  
If any short-circuit failure occurs in an inverter, then a motor generator is used to execute a safety driving. If the rotational speed of a motor generator calculated from a detection value of a...
8040101 Alternating current motor drive circuit and electric vehicle drive circuit  
A current source rectifier is provided at an output of an alternating current generator, an alternating current motor is connected to an output of the rectifier via a voltage source inverter,...
8030878 Motor driving device having power failure detection function  
A motor driving device that accurately achieves power failure detection according to a power failure tolerance with a relatively simple configuration. A counter input computing unit determines, as...
8026679 Hybrid vehicle  
A hybrid vehicle includes: first and second rotary electric machines; a matrix converter connecting the first and second rotary electric machines to each other to provide AC to AC power conversion...
8026691 Double ended inverter system with a cross-linked ultracapacitor network  
A double ended inverter system for an AC traction motor of a vehicle includes a fuel cell configured to provide a DC voltage, an impedance source inverter subsystem coupled to the fuel cell, a DC...
8022660 Control apparatus for AC rotary machine  
A control controls starting of an AC rotary machine by calculating a resistance drop component, corresponding to a resistance drop of the AC rotary machine, based on a detection current, and...
8011198 Method of preheating inverter-driven compressor and device therefor  
To reduce a leakage current when a motor for driving a compressor is energized, with the compressor unoperated. Setting the carrier frequency of an inverter at a value lower than that used during...
8013564 Multi-phase AC motor driving device  
A multi-phase AC motor driving device in which occurrence of failure is not erroneously determined is provided. In a multi-phase AC motor driving device including an inverter circuit; current...
8008885 Power converters  
A power converter interfaces a variable voltage and variable frequency motor to a fixed voltage and fixed frequency network. A first inverter is connected to the motor stator. A dc link is...
8002056 Double-ended inverter system with isolated neutral topology  
Systems and methods are provided for an inverter system for use in a vehicle having a first energy source and a second energy source. The system comprises a motor having a first set of windings...
7999499 Rotating electrical machine control system and vehicle drive system  
A rotating electrical machine control system includes a rotating electrical machine, a frequency conversion portion, a voltage conversion portion, a torque limitation portion, and an abnormality...
7990097 Power conversion system and method for active damping of common mode resonance  
Power conversion systems and methods are presented for damping common mode resonance, in which inverter or rectifier switching control signals are selectively modified according to a damping...