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7612511 |
Load drive apparatus
A load drive apparatus includes a noise filter, which includes a coil connected in series between a power source and a load, and a switching transistor connected in parallel across the coil, and a...
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7545113 |
Harmonic disturbance regulator
Presented is a harmonic regulator that regulates a plurality of individual harmonics in a system having periodic torque disturbances to commanded values, including zero. For each harmonic being...
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7518331 |
AC rotating electric machine control method and electrical power train system
Solving Means: A field coil current and a stator current are controlled by a controller. The stator current is controlled under vector control and is controlled so that the phase keeps an efficient...
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7501784 |
Compensation method and apparatus for preventing damaging bearing currents in an electrical machine
In an apparatus to increase the service life of bearings in an electric machine, the bearing currents that act on the bearings of the rotor are reduced by the application of a corresponding...
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7453224 |
Sensing mechanical transitions from current of motor driving hydraulic pump or other mechanism
A circuit and method for detecting an operating transition of a mechanical apparatus driven by a hydraulic prime mover comprising a hydraulic pump driven by an electric motor, the operating...
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7397216 |
Circuit for monitoring harmonic distortion in the power supply of a synchronous electrical machine with permanent magnet excitation
The present invention provides a circuit for monitoring harmonic distortion in the power supply of a synchronous electrical machine with permanent magnet excitation that comprises a rotor without a...
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7345446 |
Method of controlling movable member driven by electric motor
Method of controlling a movable member driven by an electric motor by monitoring current circulating through the electric current and ripples therein. The method including detecting current peaks...
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7342372 |
Method for power control of an electric motor
The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power...
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7271557 |
AC motor driving apparatus and method of controlling the same
The AC motor driving apparatus comprises an inverter for supplying power to an AC motor, current sensors for detecting current that flows in the motor or inverter, a rotation sensor for detecting...
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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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7248014 |
Motor control system
A motor control system capable of securing stability and rapidity of motion even in a machine where the stability varies in accordance with a position of a driven member. The driven member and a...
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7208903 |
Control device for alternating-current motor
In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor...
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7208901 |
Control method for jerk-limited speed control of a movable machine element of a numerically controlled industrial processing machine
A control method for controlling a speed of a movable machine element of a numerically controlled industrial processing machine with jerk limitation is described. The processing machine can be, for...
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7190144 |
System and method for adjusting a PID controller in a limited rotation motor system
An adjustment system is disclosed for adjusting a proportional, integral, derivative controller in a limited rotation motor system. The adjustment system includes a first transform unit, a second...
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7183738 |
Motor control device
A speed control means 7 for outputting a drive command signal for a motor 1 to make the speed of the motor 1 conform to the speed command signal based on a signal indicating the difference...
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7170247 |
Method of control of magnetic sound of alternating current rotating machine
A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n−1-th order frequency in inverse turn on a multi-phase...
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7161323 |
Motor drive apparatus, electric actuator and electric power steering apparatus
The disclosure concerns a a motor drive apparatus, an electric actuator and an electric power steering apparatus capable of continuous torque control up to the high drive speed and high torque...
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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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7145307 |
Data storage apparatus and control method thereof with compensation
Embodiments of the invention provide a data storage apparatus and its control method capable of accurately reading/writing data. A data storage apparatus in an embodiment of the invention...
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7145304 |
Rotating storage media control loops having adaptive feed forward insertion of signals including harmonics
An adaptive feed forward controller inserts signals into control loops of an optical disc player and/or recorder at a frequency of the rotation of the disc and one or more harmonics thereof, while...
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7141951 |
Data storage apparatus with compensation for vibration and control method thereof
Embodiments of the invention provide a data storage apparatus and its control method capable of accurately reading/writing data. In one embodiment, a data storage apparatus comprises: a servo...
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7119507 |
Brushless DC motor and brushless DC motor controller
A brushless DC motor has a stator and a rotor. An angle θ 0 between an edge section of the flux barrier on a magnetic pole center side and an edge section on a side for coming in contact with the...
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7088070 |
Resonant scanning mirror driver circuit
A resonant scanning mirror driver configured to drive a micro-electro-mechanical system (MEMS) mirror to a desired deflection utilizes a PWM pattern selected from patterns having a preset number of...
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7068923 |
Speed control apparatus of motor
A speed control apparatus includes a speed control part 12 for generating a source current command based on a difference between a speed command of a motor 4 and speed detection in which a...
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7053582 |
Control magnetic bearing device
A control magnetic bearing device comprises a plurality of control magnetic bearings for contactlessly supporting a rotor, an electric motor for rotating the rotor, a magnetic bearing drive circuit...
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7049783 |
Method of control of magnetic sound of alternating current rotating machine
A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n−1-th order frequency in inverse turn and an m+1-th...
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7034493 |
Motor control apparatus and motor control method
A motor control apparatus having a fundamental wave current control circuit that implements feedback control on a fundamental wave component of a motor current in a dq coordinate system rotating in...
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7026779 |
Motor control apparatus for controlling operation of mover of motor
A motor control apparatus of the present invention comprises a velocity detector for detecting a rotation velocity of a mover of a motor, a position detector for detecting a position of the mover,...
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6984960 |
Methods and apparatus for current control of a three-phase voltage source inverter in the overmodulation region
A drive system that is suitable for high bandwidth current control of a three-phase voltage source inverter in the overmodulation region includes a feedback path that has a harmonic decoupling...
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6936990 |
Method for controlling electric motor and apparatus for controlling the same
An apparatus and method for controlling an electric motor is disclosed. The apparatus includes an instruction inputting section for transmitting an instruction for an electric motor or a control...
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6927550 |
Device and method used to automatically compensate for synchronous disturbance
To eliminate unwanted vibrations caused by synchronous disturbances, such as synchronous disturbances caused by an imbalance, for example, the invention proposes a compensation device for closed...
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6914397 |
Reduction of interference currents in a group of synchronized, variable speed electric drives
The simultaneous generation of interference currents with the same polarity is prevented in all converters of connected drives, without adversely affecting the time slice synchronization or the...
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6903530 |
Electric motor controller resonance frequency detection apparatus
A resonance frequency detector for an electric motor controller in which a resonance frequency can be measured at high speed by a simple calculation and the resonance frequency can be detected by...
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6903528 |
Machine model estimating device of electric motor control apparatus
A machine model estimating device of an electric motor control apparatus having an electric motor for driving a load machine, a rotation detector for detecting a rotating angle of the electric...
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6859001 |
Torque ripple and noise reduction by avoiding mechanical resonance for a brushless DC machine
A method of reducing torque ripple and noise for an brushless DC machine comprising: determining a control frequency for the electric machine, the control frequency indicative of an existing...
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6825633 |
Method for adapting jerk profiles through jerk limitation for minimizing excitations of oscillations during movement of a machine element
The excitation of an oscillation in a mechanical system, such as a machine element, subjected to a jerk can be suppressed or at least attenuated by rounding a corresponding jerk curve and/or by...
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6822415 |
Motor controller
A electric motor control device is provided for controlling an electric motor which actuates a movable member of a machine through a transmitting mechanism. When a torque command is given as motion...
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6741914 |
Notch filtering as used in a disc drive servo
A method for optimizing the attenuation of mechanical resonances of actuator driving energy of a disc drive is presented. The method generally involves determining a resonant frequency range of the...
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6624607 |
Energy-absorbing filter for a motor
An energy absorbing filter for reducing mechanical oscillations in motor is disclosed. The energy absorbing filter places a virtual shunt across the motor windings so as to dissipate mechanical...
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6614197 |
Odd harmonics reduction of phase angle controlled loads
The present invention relates generally to the reduction of odd harmonics of phase angle controlled loads. One embodiment relates to an apparatus for reducing odd harmonic currents introduced into...
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6611123 |
Servo control apparatus and gain adjusting method
A disk apparatus includes a DSP (digital signal processor), and a DSP core of the DSP receives a feedback input from a pick-up, and generates a focus control pulse and a tracking control pulse....
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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...
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6590358 |
Servocontrol device
Magnitudes of a sine-wave component and a cosine-wave component of a periodical disturbance are estimated in real time during motor rotating, the sine-wave component and the cosine-wave component...
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6531842 |
Sine wave variable speed drive
The present technique utilizes already existing components within a variable speed drive to provide harmonic filtering characteristics. Particularly, the present technique integrates transformers...
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6515444 |
Method for controlling a current-regulated motor
The invention relates to a method for controlling an alternating-current motor fed from a current-controlled alternating-current source, in which method the effect of harmonic moments generated in...
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6498447 |
Apparatus and method for controlling an electric machine
A controller for an electronically commutated electrical machine receives a feedback signal indicative of a parameter which it is desired to minimize, e.g. torque ripple, current, voltage,...
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6480130 |
Method for improving repeatability and removing hysteresis from electromechanical actuators
A process of enhancing repeatability of the force applied to an object by an electromechanical system having an electric motor, a rotary to linear motion converter and a gear train mechanically...
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6426602 |
Minimization of motor torque ripple due to unbalanced conditions
A method of minimizing the torque ripple produced by unbalanced phase currents in a sinusoidally excited motor is disclosed. The method comprises measuring the position of the motor; sampling the...
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6310456 |
Control system and method
A control system for determining a control function for a control device on the basis of a transfer function of an object to be controlled and for adjusting an operation quantity of an object to be...
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6307344 |
RFI suppression package for DC electric motors
A radio frequency interference suppression circuit assembly for an electric motor is provided in an easily assembled efficient package. The circuit assembly uses a case which houses a toroid...
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