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7588125 |
Elevator control device
An elevator control device that drives a cage in a high-efficient speed pattern without using a load detector such as a conventional scale device. The elevator control device includes: a current...
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7560895 |
Indirect rotor resistance estimation system and method
Indirect rotor resistance estimation for an AC induction motor is achieved by successively stepping the quadrature command to zero and the direct current command to a predetermined value causing...
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7541758 |
MOS rectifying device, driving method thereof, and motor generator and motor vehicle using thereof
V-phase upper-arm open phase detecting circuit outputs a permission signal to allow U-phase lower-arm MOSFET to be conductive when the V-phase voltage is higher than the positive electrode...
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7528569 |
Inverter circuit free from power-source-voltage fluctuation
An inverter circuit includes a bridge circuit constituted of a plurality of pairs of a high-side switching element and a low-side switching element, a command signal processing section, a pulse...
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7521888 |
Electric motor controller for a domestic appliance
The invention relates to a three-phase asynchronous electric motor for domestic appliances, comprising power elements, such as triacs or relays, for charge control. The power elements other than...
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7508149 |
Oil pump systems and methods for preventing torque overload in motors of oil pump systems
Methods and apparatus are provided for preventing a voltage overload condition of an alternating current (“AC”) motor electrically coupled to an inverter. In an embodiment, the system includes...
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7501787 |
Method for controlling AC motor
An inverter that supplies a desired primary voltage (v 1 ) to an induction motor, a current detector that detects a primary current (i 1 ) from the inverter to the induction motor, a voltage...
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7468595 |
System and method of controlling the start-up of an adjustable speed motor drive based sinusoidal output power conditioner
A motor drive for conditioning power to be delivered to a load includes a current feedback circuit that monitors current being fed to a transformer connected between the motor drive and the load....
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7459874 |
System and method for controlling electric drive systems
Methods, apparatus, and systems are provided for regulating the operation of a drive system within a battery voltage and power range. The apparatus includes a PI regulator producing a signal for...
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7432683 |
PWM pattern sequence to reduce losses in voltage source inverters
A method for controlling an inverter uses sequences of predetermined states where each state uniquely corresponding to a set of control signals provided to the inverter that is coupled to a motor....
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7423406 |
Power control of an induction machine
Regulation of the active and reactive power of an induction machine in a coordinate system fixed on the winding, wherein a first regulator output variable is generated using a first regulator as a...
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7420351 |
Power-factor correction device for variable speed drive
A variable speed drive for a three-phase electric motor, including a rectifier module supplying a rectified voltage from a single-phase alternating current network, a voltage step-up module...
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7411370 |
Vector controller of induction motor
Provided is a vector control apparatus for an induction motor which is capable of obtaining stable rotation in a short period of time for adjustment even at the time of low-speed operation by...
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7408319 |
System and method for regenerative energy control when multiple motors share a common power supply
When multiple motors ( 40 ) share a common DC power supply ( 10 ) via a bus ( 20 ), a system and method is provided for managing the effect of regenerative energy caused by a motor. The...
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7403404 |
Power inverter system and method of correcting supply voltage of the same
In a power inverter system, an inverter unit includes first to third single-phase inverters. In the power inverter system, a reference-frequency calculating unit calculates a reference frequency of...
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7339333 |
Motor drive control apparatus, motor drive control method and program of the same
A general-purpose comparator can be used as a comparison processing module to reduce the costs of a motor drive control apparatus. The apparatus has an electric machine; a magnetic pole position...
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7317295 |
Electric motor driving system, electric four-wheel drive vehicle, and hybrid vehicle
An electric four-wheel drive vehicle includes: an internal combustion engine; a generator for outputting DC electrical power; an inverter for converting DC electrical power, output from the...
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7235948 |
Forklift and method for controlling induction motor applied to the same
A forklift having a cargo apparatus, the responsiveness of which to the operation by a user is improved. The forklift has: a DSP which generates a frequency instruction f* in response to the...
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7221122 |
Inverter control device
An inverter control device controls the operation of an inverter connected to an electric motor. A switching vector SV is determined as an output switching vector SVo to be supplied to the inverter...
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7199549 |
Feedback parameter estimation for electric machines
A method and system for estimating a parameter of an electric machine, including a controller and a switching device, the controller executes a parameter estimation process, which is responsive to...
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7180259 |
Driving apparatus for driving multiple induction motors
The driving apparatus according to the invention includes an inverter that drives multiple induction motors connected in parallel, and a secondary current calculating circuit that calculates the...
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7180263 |
Synchronous motor control method and device
Synchronous motor controlling apparatus and method controls power applied to minimize or eliminate speed variations of a synchronous motor due to variations in load imposed the motor. The...
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7148651 |
Apparatus and method for controlling AC motor and module therefor
A method and apparatus for controlling a permanent magnet synchronous motor by accurately detecting 3-phase motor currents from a DC input current in a full voltage range are provided. In the motor...
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7126308 |
Interface circuit with power converter with interface circuit and electric vehicle with power converter
In order to provide an interface circuit, a power converter using the same and an electric vehicle using the same, wherein this interface circuit ensures improved control reliability without...
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7122991 |
Power conversion and vehicle
A power conversion system for converting a dc voltage to a pulsed ac voltage includes a dc voltage source providing three or more electric potentials, and a switching circuit arranged to connect...
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7112940 |
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...
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7112936 |
Apparatus and method for controlling brushless DC motor
An apparatus and method for controlling a brushless DC motor, which minimizes a torque ripple thereof, and includes a power converting unit to convert alternating current (AC) power to polyphase AC...
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7106023 |
Motor driving apparatus
The present invention is directed to the provision of a servomotor driving apparatus that feeds energy stored in a power storage part connected with a DC link that connects a rectifier circuit with...
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7102323 |
High power density/limited DC link voltage synchronous motor drive
A method and an apparatus optimize performance of a motor drive system. The method according to one embodiment comprises: selecting a property for a rated operation point; selecting inverter system...
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7098624 |
Method and system for detecting the disconnection of an auxiliary power supply from a poly-phase motor
To a neutral point of a motor is connected a positive electrode of an auxiliary battery and an auxiliary load. Voltage on a power supply line to the auxiliary load, a neutral point voltage, is...
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7095208 |
Inverter controller for driving motor and air conditioner using inverter controller
A reactor having a predetermined small capacity is connected to a rectifier, and a capacitor having a predetermined small capacity is connected between DC bus lines of the inverter, so that a...
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7095209 |
Method and apparatus to regulate torque provided to loads
A method and apparatus for use with a controller for controlling a machine wherein a torque reference value is provided, the method for identifying an error representative of the difference between...
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7084600 |
Power control apparatus for a turbo charger equipped with an assist motor and a motor driven turbo charging apparatus
A power control apparatus includes an inverter giving a rectangular waveform drive signal to an induction motor, an inverter voltage controlling section controlling an output voltage of the...
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7084602 |
Predicting wheel slip and skid in a locomotive
The present invention is directed to the termination of the occurrence of wheel slip/skid and prediction and prevention of the onset of wheel slip/skid in a locomotive. In one configuration, a...
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7064514 |
Motor drive system for AC motors
A motor drive system without any portion for directly detecting the rotor position, rotation speed and motor phase currents, capable of realizing a high-performance variable speed drive even at...
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7064518 |
Driving circuit of an AC fan motor
A driving circuit of an AC fan motor has an AC to DC converter, a regulated voltage divider, a motor driving unit, two windings each having many coils and a harmonic wave suppression unit. The AC...
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7064517 |
Motor driving apparatus for use in a dishwasher
An apparatus for driving a motor of a dishwasher includes an AC power source, a rectification circuit for converting an AC power from the AC power source to a DC power, an inverter circuit for...
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7064516 |
Motor driver
While the motor drive amplifier is not operating, electromagnetic switch contacts are held closed for a predetermined period of time, three-phase power is rectified by a rectifier circuit and a...
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7053587 |
Apparatus for controlling three-phase AC motor on two-phase modulation technique
An apparatus is provided to control a three-phase AC motor and comprises an inverter and a controller. The inverter powers the motor in response to a three-phase PWM command. The control circuit...
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7034478 |
Digital spindle control architecture
A three-phase spindle motor has three terminals each driven with pulse width modulated signals. Rotation of the motor is controlled by iteratively measuring an electrical period of the motor,...
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7026771 |
Motor control apparatus and electric appliance using the same
A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed...
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7005812 |
Commutation converter for a brushless servo motor
An apparatus that allows a non-standard brushless motor to be driven with a standard drive amplifier. The motor rotation angle signal from a custom feedback device is converted to a standard format...
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6965212 |
Method and apparatus for field weakening control in an AC motor drive system
A method and apparatus control a power converter ( 20 ) of an AC motor drive system ( 10 ). The method and apparatus: generate a field current regulating signal to control a field current component...
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6958589 |
Inverter controller for driving motor and air conditioner using inverter controller
A reactor having a predetermined small capacity is connected to a rectifier, and a capacitor having a predetermined small capacity is connected between DC bus lines of the inverter. A PN voltage...
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6952089 |
Motor drive with voltage-accurate inverter
Improved voltage stiffness in the output voltage of an inverter used for a motor drive is obtained by a minor voltage feedback loop connecting the output of the inverter to a three-phase input in a...
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6940250 |
Synchronous motor control device and method of correcting deviation in rotational position of synchronous motor
In a synchronous motor control device that corrects a deviation in rotational position which is related to a rotational position detector for a synchronous motor on which vector-control is...
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6844699 |
Current detection device
A current detection device used for a plurality of rotating electric machines is provided. The rotating electric machines are supplied with a composite current containing a plurality of frequency...
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6831440 |
Flux position identifier using high frequency injection
A method and apparatus for use with a controller that uses a flux angle position value to control a three phase induction machine, the method for determining an instantaneous flux angle position...
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6831439 |
Apparatus for measuring magnetic flux of synchronous reluctance motor and sensorless control system for the same motor
Disclosed are a flux observer and a sensorless control system of a synchronous reluctance motor. The flux observer includes an estimated flux output unit, a measured flux output unit, and a...
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6788024 |
Position-sensorless motor control method and apparatus
A provide a position-sensorless motor control apparatus comprises a salient-pole AC motor 2 , a PWM inverter 3 for applying voltage to the AC motor 2 , and a controller 1 for controlling the...
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