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7323845 |
Apparatus for controlling operation of compressor and method therefore
Provided is an apparatus for controlling an operation of a compressor which can always apply a constant voltage to the compressor without noise and a method therefor. The apparatus for controlling...
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7317296 |
Electric motor
The electric motor is equipped with an electronic control, for example in the form of a frequency converter ( 2 ) and comprises at least one Seebeck element ( 6 ) whose one side is connected to the...
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7307400 |
Inverter operation with over-modulation
A variable frequency drive including a plurality of power cells that are configured as three phases of series-connected cells to deliver power to a load. The drive is operated to increase the...
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7307401 |
Method and apparatus for PWM control of voltage source inverter
PWM methods and apparatus are provided for loss minimized control of AC motors taking into consideration inverter non-linear limitations. The method comprises providing a voltage to the AC motor...
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7304451 |
Motor control apparatus and method for generating modulation wave instruction of PWM inverter of the same motor control apparatus
A motor control apparatus capable of expanding a voltage output and a modulating wave signal generating method for a PWM inverter apparatus of the motor control apparatus, which is controlled by a...
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7282886 |
Method and system for controlling permanent magnet motor drive systems
Methods and system are provided for controlling permanent magnet motor drive systems. The method comprises the steps of adjusting a first current command in response to a first voltage error to...
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7282877 |
DC brush motor rotation amount detection method and apparatus
The present invention provides a DC brush motor rotation amount detection method comprising the steps of: counting pulses generated by switching of brushes when a DC brush motor rotates; removing...
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7271566 |
Method and system for managing the voltage on the DC bus of a speed controller for an AC motor
A method and system for managing the voltage of a DC bus of a speed controller for an AC electric motor linked to a current distribution network. The method includes comparing a value of the...
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7271565 |
Apparatus for controlling speed of fan motor of air-conditioner
An apparatus for controlling a speed of a fan motor (HIM (Hybrid Induction Motor)) of an air-conditioner extends a speed control range of a fan motor of an air-conditioner by controlling...
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7268516 |
Circuit for use with switched reluctance machines
A switched reluctance machine is energized by phase circuits with four active switches, for example MOSFETs, arranged in a bridge configuration. The switches are capable of conducting current in...
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7265511 |
Motor control device
A speed controller includes a speed integration compensation low-pass filter, an integral control system, a proportional control system, and a multiplication device means. The speed integration...
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7265506 |
Noise improved linear DC motor control systems and methods
A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for...
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7262577 |
Method for estimating the sum of stator and rotor resistances
A method for estimating the sum of the stator and rotor resistances of an induction machine using a frequency converter when the frequency converter is connected to the induction machine. The...
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7240761 |
Electric power steering apparatus
In a current control system for a cylindrical permanent magnet synchronous motor as the drive source of an electric power steering apparatus, proportional gain Kdp and integral gain Kdi of a d-axis...
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7230394 |
Apparatus and method for controlling motor in washing machine
An apparatus for controlling a motor in a washing machine, which includes a speed sensor for measuring speed of the motor, and a controller that compares the measured speed with a target speed to...
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7227331 |
Safety interlock and protection circuit for permanent magnet motor drive
A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the...
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7224141 |
Position controller of motor
A position controller of a motor in which the position time can be shortened even if an external force is applied. A speed control unit ( 13 ) comprises a compensation low-pass filter ( 133 )...
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7221121 |
Frequency converter for different mains voltages
The invention is directed to controlling an electric motor by means of a frequency converter. The frequency converter can be connected to one of several different mains voltages. According 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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7211984 |
Start-up and restart of interior permanent magnet machines
A method of starting a permanent magnet machine. A machine stator voltage in a stationary reference frame is sensed. An initial speed of a rotor of the machine is estimated based on the sensed...
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7211985 |
Training device
On a training device, in particular for developing human muscles, having a torque-generating unit which comprises an electric motor and a reduction gearing, and whose output interacts with at least...
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7197410 |
Predicting loss of frequency lock between a motor control circuit and a motor
Method arid apparatus for accelerating a multi-phase motor having a rotatable rotor are disclosed. The method incorporates use of a motor control circuit to predict a subsequent loss of frequency...
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7193388 |
Offset PWM signals for multiphase motor
A multi phase motor includes a switching array for interconnecting a power source to each phase. A current sensor senses current supplied from the power source via the switching array to the...
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7190143 |
Pulse width modulation (PWM) rectifier with variable switching frequency
A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated...
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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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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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7170283 |
Device for detecting a position of a magnetic pole
A position-of-magnetic-pole detecting device includes first and second units for inferring a position of a magnetic pole. The first unit applies a current command while changing an excitation...
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7154244 |
Steering apparatus
Steering apparatus includes at least one motor for generating a steering assisting force in a direction to steer a steerable wheel, two drive circuits having respective switching elements for...
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7151354 |
Magnetic noise reduction method for AC rotary electric machine, and motor control apparatus and AC rotary electric machine apparatus using the same
The invention provides techniques for reducing or altering the magnetic noise of an AC rotary electric machine. A magnetic noise reducing harmonic current of order n, whose frequency is n times 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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7148650 |
Maximum power point motor control
A method and apparatus are implemented in software to control motor speed as a function of available power in a DC source-inverter-AC motor system, i.e. to perform maximum power tracking of motor...
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7148652 |
Method and apparatus for determining and handling brake failures in open loop variable frequency drive motors
A controller for a variable frequency drive monitors electrical power from a variable frequency drive motor while a brake is maintaining a load driven or moved by the motor without requiring...
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7145310 |
Method and system for controlling permanent magnet synchronous motor
A system for controlling a permanent magnet synchronous motor calculates fundamental a d-axis (or q-axis) voltage command based on a difference between a d-axis (or q-axis) current command and a...
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7141948 |
Electromotive power steering system
An objective is to provide, in a motor controller used for an electromotive power steering system, a concrete realistic method for easily performing abnormality judgments in its control system. The...
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7135834 |
Modified field oriented control
In accordance with certain embodiments, the present technique provides a reduced current field-oriented-control scheme. For example, the present technique provides a method of controlling an...
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7126306 |
Motor control unit
Windings of each phase in a three-phase AC motor are independent of one another. A motor control unit gives, to windings of each phase (U, V and W-phase), currents (IU, IV, IW) obtained by adding,...
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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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7106024 |
Filter with increased first harmonic response and reduced phase shift in a wide frequency band for encoderless drive applications
A method and apparatus for use with a controller that supplies voltages to an induction machine via supply lines, the voltages including a fundamental voltage component and an injected voltage...
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7102325 |
Method for determining rotor flux vector of AC electrical machine
A method for determining the rotor flux vector of an electrical machine, the method comprising the steps of controlling the electrical machine with an inverter, forming an equation for the reactive...
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7102314 |
Brushless motor control apparatus having overheat protecting function
A brushless motor control apparatus detects a phase current flowing in a brushless motor, converts the phase current to a vector current including a d-axis current of a magnetic flux direction...
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7102305 |
Apparatus and method for controlling motor
A motor control apparatus includes a direct-current power source and an inverter circuit, which includes a switching element. The motor control apparatus receives a current command value in every...
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7102312 |
Motor driving apparatus, driving method thereof and mobile terminal
A motor driving apparatus and a driving method thereof, and a mobile terminal in which a terminal voltage value of a terminal is detected at a terminal voltage detection unit, and is held in a...
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7102326 |
Motor speed variator and a driving method thereof
A motor variator and a driving method thereof are provided for controlling the operating speed of a fan, which employ an alternate current chopper to change the working cycle and the rotary speed...
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7102324 |
Fixed speed drive
A controller for an electric machine. The controller includes a first voltage input that directly provides a first voltage to the electric machine, a second voltage input configured to receive 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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7091690 |
Power conversion device
A power conversion device is constituted by: a power converter that receives AC power and uses this to drive an AC motor; a control section for controlling an inverter section of the power...
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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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7084604 |
Speed sensorless control of an induction machine using a PWM inverter with output LC filter
A method of controlling of an induction machine using an inverter is disclosed with output LC filter. The method includes determining an inverter output current vector ( i A ), determining an...
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7084603 |
Motor control device
A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency...
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7081735 |
System and method for bypassing a motor drive
A motor control system comprising a plurality of motor controllers and a power source adapted to drive an electric motor. The motor control system comprises a switch that is selectively operable...
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