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6611127 Drive circuit for motor/generator  
A drive circuit for a motor/generator, having a first rotating electrical machine which is mainly used as a motor and a second rotating electrical machine which is mainly used as a generator, is...
6611126 Injection molding machine capable of reducing power consumption  
A motor drive 50 of an induction motor IM includes an inverter section 20, a charger 60, a charging and discharging circuit 70 and a control section 80. The charger 60 is for storing regenerated...
6611125 Method for calculating inertia moment and driver for electric motor  
An electric motor is rotated at a velocity ω1. After that, during Δt12 seconds, the 1st acceleration is executed at a rate (ω2−ω1)/Δt12. During this acceleration, the torque τm is calculated so as...
6611167 Balanced bi-directional current source  
A balanced bi-directional current source is provided, which includes first and second current output terminals, a current control circuit, first and second amplifiers and first and second sense...
6600288 Cooking device with voltage, phase and frequency converter  
A cooking device having a cooking chamber, a motor unit for driving a fan for purposes of circulating cooking chamber atmospheres in the cooking chamber, a control and regulator unit cooperating...
6598008 Method of estimating speed of induction motor and magnetic flux of rotor  
A method of estimating the speed of an induction motor and the magnetic flux of a rotor is disclosed. The method consists of the steps of a) obtaining some measurable or calculable variables for...
6593711 Electronic control arrangement  
A motorized assembly comprises first and second bridge circuits across which respective drive motors are connected. At least one auxiliary motor or actuator is connected between one arm of the...
6590362 Method and system for early detection of incipient faults in electric motors  
A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during...
6590360 Control device for permanent magnet motor serving as both engine starter and generator in motor vehicle  
A control device for a permanent magnet motor serving as both a starter for an engine and a generator in a motor vehicle is disclosed. The control device includes a drive circuit converting a...
6586905 Automatic sensing of bypassing of soft starter or controller  
A motor controller controls a motor operated by an AC line voltage. The controller includes an SCR connectable between an AC line and a motor terminal for controlling application of AC line...
6583995 Permanent magnet generator and generator control  
A system includes a permanent magnet generator, a dc link, an inverter coupled between the generator and the dc link, and a control for the inverter. The control regulates dc link voltage by...
6577087 Multilevel DC link inverter  
A multilevel DC link inverter and method for improving torque response and current regulation in permanent magnet motors and switched reluctance motors having a low inductance includes a plurality...
6577097 Method and system for controlling a synchronous machine using a changeable cycle-conduction angle  
Method and system for controlling a synchronous machine including a polyphase stator are provided. The machine may be used in a piece of equipment respectively as a generator and as a motor for...
6577096 Sensorless vector control system of induction motor and method thereof  
A sensorless vector control system of an induction motor includes: a magnetic flux and speed controlling unit for receiving a predetermined command value and generating two phase voltages of DC...
6573681 Drive control for a three phase AC motor via an inverter using safe technology  
The combining of two technically contrasting functions of “safe stopping” and “braking by armature short-circuiting” is served by using two means for pulse inhibition to block the respective...
6559618 System and method of control for sensorless induction motor drives  
A system and a method of vector sensorless control for electrical drives with induction motors, based on the generation of a high frequency rotating magnetic field which, by composing with the...
6560130 Control circuit for multiphase inverter apparatus  
In a control circuit for a power converting apparatus, such as a three-phase inverter, unnecessary switching operations of switching elements are avoided. The control circuit includes current...
6548984 Power output device  
When the absolute values of the negative voltage V− and the positive voltage V+ of a rectangular wave to be applied to the three phase coils of the motor driven using a rectangular-waved voltage...
6545444 Device and method for utilizing a monopole motor to create back EMF to charge batteries  
A back EMF monopole motor and method using a rotor containing magnets all of the same polarity and in a monopole condition when in momentary apposition with a magnetized pole piece of a stator...
6538412 Method for controlling a power drive system  
To minimize the energy required for operation of a rail vehicle, in a drive system that has an intermediate circuit converter 1 and a three-phase motor 7 fed by it, the intermediate circuit...
6538400 Control system for an electric motor  
An apparatus for controlling multiple vehicle systems includes a single power supply that provides a direct current source. The power supply is comprised of a thirty-six volt (36 V) battery power...
6534949 Motor drive converter and method with neutral point drift compensation  
A high power motor drive converter comprises: a three level neutral point clamped (NPC) output power conversion stage including switches for supplying power to an AC drive motor; a split series...
6534948 Motor driving circuit, a method for driving a motor, and a semiconductor integrated circuit device  
A motor driving system is disclosed. The circuit includes a power converter for supplying a brushless motor having a permanent magnetic rotor with pulse-width modulation controlled driving power,...
6531843 Driving system of AC motor  
The present invention provides a control algorithm which instantaneously detects magnetic pole positions in the inside of a motor including polarities of the motor. A controller 1 applies a minute...
6528966 Sensorless vector control apparatus and method thereof  
A sensorless vector control apparatus includes a speed controller for receiving a speed command value from a user and outputting a synchronous speed; a ‘d’ and ‘q’ axis voltage command unit for...
6525506 Current limit circuit of inverter refrigerator  
The present invention relates to a current limit circuit of an inverter refrigerator. The present invention comprises a current limit unit for outputting a current limit signal by comparing an...
6518723 H-bridge motor driving circuit  
An H-bridge motor driving circuit has, between a PWM comparator and a control circuit, first and second frequency dividers for frequency-dividing, by 2, an AND gate, OR gate, and first and second...
6509711 Digital rotor flux observer  
A system (10) for controlling the torque of an induction motor (12) utilizes a flux observer (14). The flux observer (14) receives stator current inputs (16, 18) and a rotor speed estimate (80)...
6495986 Safe speed monitoring for sensor-free three-phase drives  
The present invention makes possible a safety function for speed monitoring in the case of all induction machines operated on an inverter without a sensor system, in that a determined setpoint...
6492790 Driving system for driving AC motor  
A driving system for driving an AC motor, which is capable of promptly switching to an individual inverter operation mode, wherein a control instruction for each of a plurality of power converters...
6486632 Control device for motor/generators  
A controller for motor/generators is proposed which allows reductions in ripple current generated by an inverter driving a power-generating motor/generator and a vehicle-driving motor/generator....
6474447 Elevator power control for adjusting ratio of power supplied from each of dual power sources  
To reduce a total power amount required to drive an elevator by a commercial power supply during a peak power-consumption time period, for instance, afternoon in summer time, a control apparatus...
6472845 Motor/generator device  
An inverter (23) generates a composite current comprising an electrical current for a first rotor (4) and an electrical current for a second rotor (3). A microprocessor (22) controls the inverter...
6469462 Control apparatus for electric vehicle  
A control apparatus for an electric vehicle is provided, which is capable of reducing the weight of the electric vehicle and preventing the inverter circuit from overheating. When the vehicle...
6469469 Variable output induction motor drive system  
A variable output induction motor drive system for use with a polyphase variable output alternating current motor including a rotor and stator to drive an operating load such as an automotive...
6456024 Electronically commutated DC motor  
An electronically commutated direct-current motor has a permanent-magnet rotor (19), a stator (2) that has at least one drive winding (25), and an H-bridge circuit (52) in which two bridge...
6456029 Controller for vehicle motor  
A controller for a vehicle motor includes a switching unit, a capacitor unit, output terminals and wiring lines. The switching unit is provided on a substrate to control power supply to a motor....
6452349 Electronically commutated motor  
In an electronically commutated motor, both the driving current (i2) and the braking current (i2′) are monitored. When excessive driving current occurs, a pulse duty factor which regulates the...
6448737 Semiconductor switch device for an AC power source  
A semiconductor switch device for an AC power source comprises several first semiconductor elements and several second semiconductor elements connected in series with a plurality input AC sources...
6439347 Elevator control apparatus controlling charging of a power source with regenerative power  
An elevator control apparatus includes: a converter for rectifying AC power into DC power; an inverter for converting the DC power into AC power having a variable voltage and a variable frequency;...
6435312 Elevator speed controller responsive to power failures  
A controller of an elevator for smooth speed control, using a cheap power accumulating device having a low capacity, even during a power failure. The controller has a converter, an inverter, a...
6435311 Elevator control calculating power consumed and power generated by a controlled elevator  
An elevator control device includes: a convertor which rectifies a.c. power and converts the a.c. power into d.c. power; an inverter which converts the d.c. power into a.c. power having a variable...
6437535 Starting system and method for a microturbine power generation unit  
A power electrical system is disclosed for a microturbine power generator. The invention permits the microturbine to be started using an external DC power source. The DC voltage is converted to a...
6433506 Sensorless control system for induction motor employing direct torque and flux regulation  
A sensorless control system for an induction motor employs direct tracking of torque and flux regulation to achieve improved motor control without the need for transformation to the rotor flux...
6433504 Method and apparatus of improving the efficiency of an induction motor  
An apparatus and method of maximizing the efficiency of an induction motor is claimed. Three phase AC power is supplied to energize the motor. A DC voltage and a DC current are measured and used...
6426605 Multi-phase induction motor drive system and method  
A multiphase induction motor system is disclosed. The system comprises a motor having at least five phases and comprising a stator and a rotor. For each phase, the motor receives a command current...
6422351 Elevator speed controller responsive to dual electrical power sources  
An elevator controller providing stable speed control using a cheap power accumulating device having a low capacity even in discharging. The controller has a converter, an inverter, a power...
6420847 Device for detection of current or voltage on a PWM driven winding with reduced jitter and related methods  
A method for detecting a zero-cross event of an induced back electromotive force (BEMF) or of a nullification instant of a periodic current in a PWM driven winding, by circuits generating an...
6411005 System to improve the torque smoothness of an electric machine  
A stator for an induction machine comprises a cylindrical core that has a plurality of inner and outer slots and a plurality of toroidal coils wound about the core and laid in the inner and outer...
6388420 System and method for sensorless rotor tracking of induction machines  
A drive system comprises a rotor position and velocity tracker adapted to decouple fundamental frequency effects of a zero sequence signal of an induction machine from the zero sequence signal and...