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6181099 Method and apparatus for correcting DC offset in a frequency to voltage converter and motor drive using the same  
A method and apparatus for correcting DC offset in a frequency to voltage converter. An analog frequency to voltage converter receives a frequency signal and outputs a voltage signal having a...
6175210 Prime mover for operating an electric motor  
A prime mover such as a microturbine generator is operated to generate dc power, and an inverter is controlled to convert the dc power to ac power. The ac power is supplied to an electric motor....
6166514 Apparatus and method for controlling induction motor  
In a control apparatus of an induction motor including an inverter for converting a direct current to an alternating current having a variable voltage and variable frequency in accordance with a...
6163129 Method of controlling the starting, stopping and speed of an AC induction motor  
A method for controlling the starting, stopping and operation of an AC motor is provided. Each winding of the AC motor is interconnected to an AC source by a thyristor switch and a bypass...
6140795 Variable speed control for AC induction motors  
A speed control apparatus for varying the speed of an AC motor while maintaining the torque and power constant over a range of angular speeds The AC motor is driven by a D.C. source. A universal...
6124697 AC inverter drive  
A drive for controlling the speed of an AC induction motor from an inverter. The inverter applies a voltage to the stator winding of the motor in accordance with the magnitude of a first input...
6121748 Method and apparatus for controlling an induction motor  
In an inverter controlling method for an induction motor, the slip of the motor is detected and an optimum slip which is dependent on the motor constant and the frequency supplied to the motor...
6114829 Traction system in voltage mode including power supply buses of an electric traction vehicle  
A traction system in voltage mode includes power supply buses of an electric traction vehicle, the power supply buses each including a 2F filter with the midpoints of the 2F filters being linked...
6107776 Inverter control device  
The invention includes: a random number generating unit which outputs a random number in driving of an AC motor by a voltage source inverter, a maximum/minimum triangular wave frequency setting...
6107773 Circuit arrangement for feeding a load  
A circuit arrangement for feeding a single-phase or multi-phase load from a sinusoidal alternating voltage energy supply mains which carries an at least having a frequency for which the load has a...
6104149 Circuit and method for improving short-circuit capability of IGBTs  
A simple, off-chip circuit and method for endowing high efficiency IGBTs with short-circuit capability, that is essentially transparent to the user. The invention involves adding an external...
6087801 Process for controlling a rotating machine, a servocontrol system for implementing said method and a rotating machine provided with a system of this kind  
In a process for controlling a rotating machine having n phases powered by a voltage inverter defining mn states of the stator phase voltage vector the electromagnetic torque Γ and the stator flux...
6081093 Sensorless control method and apparatus of permanent magnet synchronous motor  
The invention provides a sensorless control method and apparatus of a permanent magnet synchronous motor where magnetic axis can be assigned in all speed regions and speed can be controlled...
6078162 Method for operating parallel DC-linked AC converters for feeding an asynchronous motor and circuitry for carrying out the method  
A first DC-linked AC converter with a machine converter (6) with controllable turn-on thyristors is connected in parallel with a second DC-linked AC converter with a machine converter (4) equipped...
6075337 Speed control apparatus for induction motor  
A control apparatus for an induction motor includes a current detector for detecting the current of the induction motor; a first coordinate transformer for resolving the current into an exciting...
6075328 PWM/PAM control mode switching type motor control apparatus, and motor drive and air-conditioner using the same  
A motor drive apparatus and an air-conditioner using the motor control apparatus has a feature which allows it to gradually increase a dc voltage value to a predetermined value when starting the...
6069467 Sensorless rotor tracking of induction machines with asymmetrical rotor resistance  
A drive system for providing ac drive power to an induction machine with asymmetrical rotor resistance and for sensorless rotor tracking of the induction machine includes: a signal injector for...
6069464 Driving apparatus for an image processing system  
The present invention propose a driving apparatus for an image processing system. A DC motor with a feedback controlling system is utilized as the driving apparatus. With the design of the present...
6066934 Induction motor controller  
The invention is an induction motor controller for measuring electrical constants of a polyphase induction motor (102) by supplying test power thereto and controlling driving of the polyphase...
6064174 Motor control circuit and method with digital level shifting  
A motor control circuit control the operation of a motor that includes a motor coil. The motor control circuit includes an analog driver structured to supply the motor coil with a supply voltage...
6060859 Motor driver having a booster circuit and an inverter both controlled by pulse width modulation  
A motor driver includes an inverter having at least one arm including two series-connected switching elements and converting a direct current to an alternating current to supply the alternating...
6060860 Control apparatus for variably controlling speed induction motor  
A control apparatus for variably controlling a speed of an induction motor includes a voltage generator, adders, a rotating speed calculating device, a rotating direction detecting device, and a...
6051941 Nonlinear stabilizing control for power electronic based systems  
Power electronic based power and propulsion systems are used in a wide variety of applications including locomotives, hybrid electric vehicles, aircraft, spacecraft, and ships. In general, the...
6049185 Power circuit of an air conditioner for electric vehicles  
A power circuit of an air conditioner for electric vehicles includes a high voltage power source, a drive circuit for driving a compressor motor, and a capacitor connected between a positive side...
6046556 Motor current sensing circuit  
A motor current sensing circuit using a single sensing resistor in the motor current path to sense the current from the voltage source. The circuit includes an amplifier and a unity-gain inverter...
6043618 Motor driving apparatus having back-gate-floating MOSFET for avoiding reverse current  
In an apparatus for driving a motor including first and second terminals, a back-gate-floating MOSFET has a drain connected to the first terminal. A bridge circuit is connected between the source...
6028406 Method for commutating a brushless motor and power supply for a brushless motor  
Method for commutation of a brushless motor being supplied with electrical energy from a DC intermediary circuit via a multi-phase inverter, by which a first current and a second current value are...
6020713 Turbogenerator/motor pulse width modulated controller  
A controller for a permanent magnet turbogenerator/motor having a pulse width modulated inverter and a rectifier bridge. The pulse width modulated inverter includes a positive section magnetic...
6014007 Method and apparatus for starting an AC drive into a rotating motor  
A method and apparatus for starting a motor drive into a rotating motor, the method including determining an initial search frequency and search current wherein the current is less than a rated...
6014006 Induction motor control system with speed and flux estimation  
Method of controlling torque of a multi-phase induction motor (10) includes estimating rotor speed as a rational function of filtered stator current is0 and voltage u0 and first and second order...
6008616 Pole change induction motor and control apparatus and method for the same  
An apparatus for a pole change induction motor and control method for the same which are applicable to, for example, a driving source of an electric vehicle without power transmission are...
6002221 Control system for an electric vehicle  
A system is provided to clearly determine a problem in the discharge of a capacitor provided for an inverter of an electric vehicle and its cause. If a capacitor voltage drops below a...
6002223 Control circuit for an electric motor  
A control circuit controls the power supply to an electric motor and, comprises a power transistor NM of the NMOS type and a power transistor PM of the PMOS type arranged between two supply...
5998958 Method for estimating resistance values of stator and rotor of induction motor  
The resistance values of a stator and a rotor of an induction motor are estimated through the steps of (a) checking whether a control system of the induction motor reaches a normal state, (b)...
5990655 Method of operating an inverter for powering an induction motor  
An inverter is operated to eliminate hiss in the control of the speed of an induction motor using an inverter of variable frequency. The voltage is matched to the selected frequency to avoid such...
5982136 Circuit for sensing current in power trains for motor control  
The invention relates to a circuit and method for sensing inverter current in a motor drive power train for purposes of detecting overload and fault conditions, based on the use of simple low cost...
5977742 Electric vehicle control device  
An electric vehicle control device controls an induction motor with a VVVF inverter. A first calculation means calculates a rotor-resistance correction value of the induction motor based on a...
5977741 Method for stabilizing AC induction motor having an open loop inverter  
A method and apparatus for minimizing motor instability under no load conditions, the method including identifying instability by comparing consecutive current half cycle periods and, where the...
5973474 Vector control apparatus method for induction motor using magnetic flux observer of full order  
In a vector control apparatus and method for an induction motor, a magnetic flux observer of a full order is provided for receiving a primary voltage vector (v1) and a primary current vector (i1)...
5969499 Controller for AC motor  
A speed controller for a three phase induction motor using sliding mode control to generate estimates of stator current and rotor flux to control motor speed. The controller receives only the...
5965991 Control system for a vehicle-mounted battery  
A control system for a vehicle-mounted battery which, in accordance with the state of a battery, can make a polyphase alternating current rotating machine in a hybrid car assist the driving gear...
5965995 Transient inductance tuner for motor control  
A method and apparatus used with a field oriented motor controller for providing corrected transient inductance estimates during normal motor operation. The invention monitors q-axis feedback and...
5963442 Inverter system for driving motor  
An inventor system in which a first power supply system powers: a switching-element-group driving a motor, a charging-pump-type gate-driving-circuit, an inverter controller. A second power supply...
5955862 Frequency converter for AC motor  
A frequency converter for an asynchronous motor including a voltage converter (O) equipped with switches (Sa, Sb, Sc) controlled by a control circuit (CC) and powered by a DC bus (B) on which a...
5942876 Inverter controller  
The inverter controller includes a deviation arithmetic circuit which calculates the deviation between the current command (reference) and the output current, a vector angle arithmetic circuit...
5936375 Method for energy storage for load hoisting machinery  
A method for energy storage and recovery for load hoisting equipment driven by an inverter controlled first induction motor and having a second inverter controlling a second induction motor which...
5929592 Apparatus for controlling driving signal for motor  
An apparatus for controlling a driving signal for a motor for converting an AC input signal to an instantaneous DC signal, thereby achieving a desirable control, which is capable of preventing a...
5914582 Permanent magnet synchronous motor controller and electric vehicle controller  
A permanent magnet synchronous motor controller includes an inverter for supplying an alternating current power converted from a direct current power to a three-phase permanent magnet synchronous...
5907228 Rotating machine control command method, servocontrol system for implementing said method, rotating machine provided with a system of this kind  
In a method of regulating a rotating machine with n phases fed with alternating current by a voltage inverter including n SPmLL defining mn states Vi (iε{1, . . , mn }) of the stator phase voltage...
5905644 DC bus voltage controller  
An apparatus for use with a switch-mode rectifier for minimizing DC bus voltage without causing current distortion, the apparatus monitoring rectifier saturation and decreasing DC bus voltage...