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7574873 |
Inverter device and air conditioner using inverter device
A current sensor for detecting a power supply current is commonly used for detecting a current of a stator winding to detect a rotational position of a magnet rotor, so that a sinusoidal driving is...
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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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7511449 |
Electric motor system implementing vector and slip control
A system is provided for controlling an electric machine. The system has a power source configured to supply electric energy to the electric machine. In addition, the system has an inverter...
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7508160 |
Soft start system for motors utilizing variable frequency drive and autotransformer
A soft start system for starting large motors has a power supply suitable for passing power to the motor, a variable frequency drive connected to the power supply and an autotransformer connected...
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7477037 |
Method for parallel control of series-cell based drives
A method for controlling at least two series-cell based drives connected in parallel. The method comprises detecting a failed cell in one of the drives, inhibiting operation of the drive with the...
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7459879 |
Motor controller
A control apparatus for an electric motor, in which a current controller giving multiphase voltage commands to a drive circuit for an inverter includes a normal-mode current controller for use in a...
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7443131 |
Control device for electric power steering apparatus
A control device for electric power steering apparatus, in which when torque ripples at the time of the rotation of a motor is reduced by simple arithmetic, smooth and safe assist limitation is...
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7348756 |
Advanced current control method and apparatus for a motor drive system
An apparatus controls a power converter of an AC motor drive system, the power converter outputting multi-phase AC current to an AC motor. The apparatus comprises: a state selecting unit; and an...
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7346272 |
Anti-trap protection detection based on comparing the duty cycle of a PWM control system
In order to create a method and an apparatus for anti-trap protection detection for displaceable window and door elements by means of which faster and more stable adjustment to current physical...
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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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7317292 |
AC motor control method and control device
It is possible to control the DC intermediate voltage to be constant without using a device for returning regenerative resistance or regenerative energy to a power source and to safely continue...
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7307404 |
Controller for a permanent magnet generator and a generator in combination with such a controller
A generator controller for controlling a permanent magnet generator where each phase of the generator is connectable to a DC link via electrically controllable switches, the controller...
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7248489 |
Control of the mains bridge of a frequency converter
A method and a system for controlling the mains bridge of a four-quadrant PWM frequency converter provided with a direct-voltage intermediate circuit when power is flowing into the supply network....
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7215055 |
Vehicle
A rotating electric machine comprises a stator having stator salient poles, three-phase windings wound around said stator salient poles, a rotor rotatable held inside the said stator, and permanent...
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7193383 |
Enhanced floating reference frame controller for sensorless control of synchronous machines
A method and system for controlling a power converter coupled to a polyphase power line. The method includes measuring at least two motor phase currents, obtaining a floating reference frame for...
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7187155 |
Leakage inductance saturation compensation for a slip control technique of a motor drive
An electronic drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control...
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7176653 |
Electric motor drive
The invention relates to an electric motor drive for operating an alternating-current motor. The electric motor drive comprises a frequency converter for controlling the motor, which frequency...
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7173395 |
Inverter unit grounding method and inverter unit
A circuit system that includes a sensor circuit for a sensor that detects the state of a motor is provided in an inverter unit for driving the motor. A 0V of the circuit system is connected with a...
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7173394 |
Apparatus and method for controlling inverter
An apparatus and method for controlling an inverter are disclosed to allow an inverter to provide a stable output voltage to a motor regardless of a change in a DC input voltage. A difference value...
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7164254 |
Modulation methods and apparatus for reducing common mode voltages
Methods and apparatus for reducing the common mode voltage generated by eliminating zero-voltage vectors in a rectifier/inverter variable frequency drive (VFD) system includes comparing three phase...
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7164242 |
Variable speed drive for multiple loads
A variable speed drive is provided having a converter to convert an AC voltage to a DC voltage, a DC link to filter and store energy from the converter, and a plurality of inverters, wherein each...
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7126305 |
Apparatus for correcting current value of three-phase electric motor and correcting method
An apparatus corrects a current value of a three-phase electric motor including a current detector that detects current of each of three phases including a first phase, a second phase, and a third...
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7122992 |
Inverter system for driving induction motor
An inverter system for driving an induction motor is disclosed. The inverter system for driving an induction motor comprises: a rectifying circuit for rectifying a three-phase AC voltage and...
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7119530 |
Motor phase current measurement using a single DC bus shunt sensor
A method and system for obtaining motor current measurements from a DC bus current of an inverter that drives a pulse width modulated electric machine is disclosed. The method may include sensing a...
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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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7112931 |
Motor control device and motor control method
An inverter supply voltage generator comprises an inverter supply voltage computing unit 10 , a voltage converter 11 and a battery 12 . The inverter supply voltage generator varies inverter...
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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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7102333 |
Control of the mains bridge of a frequency converter to regenerate energy from the motor to the supply
A method and an apparatus for controlling the mains bridge of a four-quadrant PWM frequency converter provided with a DC intermediate circuit when the power is flowing in the direction towards the...
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7095194 |
Method for operating an electronically commutated (EC) motor
In a method for operating an electronically commutated (EC) motor that has a primary part having a coil and a secondary part having magnet segments, a measuring sequence is determined that has a...
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7084601 |
Phase current detector
A first condenser is connected between output terminals of a rectifier circuit which receives an AC power as an input, and a three phase inverter is connected in parallel with respect to the first...
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7075268 |
System and method for increasing output horsepower and efficiency in a motor
A system and method are provided to increase the horsepower of an induction motor. One technique for increasing the horsepower of a motor is to connect the motor to a variable speed drive that is...
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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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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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7064504 |
Control apparatus for brushless DC motor
A control apparatus for a brushless DC motor that rotatably drives the brushless DC motor including a rotor having a permanent magnet, and a stator having stator windings of a plurality of phases...
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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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7030589 |
Driving systems of AC motor
An AC motor control apparatus that is applicable to commonly used PM motors and capable of detecting the magnetic pole position with simple algorithm. The AC motor control apparatus comprises an...
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7024805 |
Dragline excavating machine with direct drive hoist and drag drums
A dragline excavating machine includes a gearless direct drive AC drive motor for driving each of the hoist and the drag drums in the system. The gearless AC motor is driven using a digital system...
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7023166 |
Method for torque control of an induction motor using a voltage controller
A method of controlling the torque of a multiphase induction motor includes the step of energizing the stator windings of the motor from a power converter using thyristors, inserted between a...
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6969963 |
PWM controlled motor drive
The motor driver having a plurality of output circuits each having two switching elements connected in series includes: a phase switch circuit for putting a switching element on one side of one...
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6940253 |
Method in connection with sensorless induction motors
A method for the stabilization of full-order flux observers for speed-sensorless induction motors in the regenerative mode. The method comprises determining the current vector of the induction...
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6924618 |
Inverter controller for driving motor, and air conditioner
An inverter controller for driving a motor includes a rectifier having a reactor, an inverter, a capacitor, a generator which generates a voltage command value for each phase of the motor, a...
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6914409 |
Current detection method and control apparatus for electric motor
A current detection method for an electric motor which detects phase currents of the electric motor driven by a power converter that provides ON/OFF control of bridge-connected switching elements,...
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6879130 |
Controller for induction motor
A controller for a vector control of an induction motor, which is capable of easily determining a rotor resistance for use in calculation of a slip frequency. A temperature sensor is provided for...
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6876171 |
Driving apparatus and method of three phase induction motor
A driving apparatus of a three-phase induction motor includes: a three-phase power supply unit for supplying three-phase power; a rectifier for rectifying the three phase voltage supplied from the...
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6844700 |
Inverter apparatus
An inverter apparatus for converting a DC power converted from an input AC power to an output AC power of a variable frequency and a variable electric power to drive an induction motor at a...
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6831442 |
Utilizing zero-sequence switchings for reversible converters
A method for providing additional dc inputs or outputs ( 49, 59 ) from a dc-to-ac inverter ( 10 ) for controlling motor loads ( 60 ) comprises deriving zero-sequence components (V ao , V bo , and V...
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6777907 |
Current ripple reduction by harmonic current regulation
A method and apparatus for regulating a harmonic current component of an inverter fed motor drive system comprises measuring a phase current of the motor, substantially eliminating the fundamental...
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6750629 |
Inverter control apparatus and motor driving system
A motor driving system for driving an induction motor with a rotation frequency detector. The induction motor drives a load, and the rotation frequency detector detects a rotation frequency of the...
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6700342 |
Method and apparatus for high performance permanent magnet motor speed control with limited position information
A control system for a permanent magnet motor having low-resolution speed measurement is taught. The control system is comprised of a speed regulator, voltage regulator and current regulator. The...
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