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6611119 |
Switching processes for control of servos
Methods and systems for controlling a servo are provided. One method includes calculating at least a first switching time to change an amplitude of a command signal to a servo, providing a first...
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6605915 |
Numerical control apparatus for machine tool
The present invention provides a numerical control apparatus for a machine tool, which corrects an axial displacement of a main spindle caused due to a change in preload level and occurring...
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6600280 |
Electric power steering system
An electric power steering system is provided which employs an electric motor as a driving source to apply a steering assist force to a steering mechanism. The system includes: an operation degree...
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6597146 |
Method and apparatus to compensate for cyclic load disturbances in a control system
A method and apparatus for essentially eliminating cyclic disturbances in a motor control system, the method including identifying frequencies of undesirable components in a feedback signal that...
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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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6586901 |
Methods and apparatus suitable for facilitating control of an aircraft rudder
A method and an apparatus for controlling aircraft rudder movement are disclosed. The system including a yaw damping control portion integrated with a directional compensation rudder control...
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6580234 |
Monitoring apparatus
A monitoring apparatus for monitoring operation of a no-back device of an actuator assembly driven by a motor, the apparatus comprising sensor device operable to sense an operating parameter of the...
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6566837 |
Position controller for motor
A position controller for motors for increasing the position loop gain of a full-close control system without causing recurrence of vibration. The controller where a position signal representing...
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6566835 |
Nc machine tool, and method of controlling nc machine tool
The present invention relates to a method of controlling a numerically controlled machine tool having a plurality of feed shafts. Also, the present invention relates to a numerically controlled...
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6559612 |
System and method for the electronic control of an actuator assigned to an automatic control system in motor vehicles
A system for electronic control of an actuator of an automatic control system in a motor vehicle, has a control unit with at least one control function unit for controlling the actuator as a...
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6541937 |
Motor control device with vector control function
When the amount L of actual load change that is picked up from an external plant control device exceeds a reference level L* of load change amount per prescribed unit time that is pre-set to serve...
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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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6518719 |
Power tools with operating speed control circuit
A variable speed power tool may include a speed adjusting device and/or a maximum speed adjusting device for adjusting the operating speed, and a fixed operating speed switch. An operator...
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6518721 |
Oscillation isolator
An oscillation isolator for supporting an oscillation isolation platform on a pedestal includes an active oscillation isolator having a displacement generating type actuator to reduce oscillation...
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6515442 |
Position controller
To overcome the problem of a low frequency disturbance causing minute vibrations affecting response attributable to the difficulty of adaption to the phase of the vibrations, the present invention...
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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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6459228 |
Dual input servo coupled control sticks
The present invention provides an active control system for coupling the movements of a pair of independently operated manual input devices such as dual flight control sticks operated by a pilot...
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6452356 |
Chopping energization control device for electric motor
In a chopping energization control device, a pair of switching elements IGBT/U and IGBT/L are used to control an electric power supplied from a DC power source to a phase coil CL 1 of a DC motor,...
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6452348 |
Robot control device, robot control method and storage medium
A robot control device for controlling a robot having a substantial entertainment value is disclosed. A sensor signal processor recognizes the voice of a user, sets an association between the voice...
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6441578 |
Method and apparatus for torque linearization in an electric power steering system
An exemplary embodiment of the invention is a method of controlling a motor in an electric power steering system. The method includes obtaining a motor control signal having an initial duty cycle...
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6437534 |
Control method for NC machine tool
A control method for an NC machine tool is provided which ensures a high precision of the contouring control, and allows for extension of the drill life, and reduction in machining time. The...
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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 analog...
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6400114 |
Numerical control apparatus for roll grinding machine
A numerical control apparatus for the numerical control of a roll grinding machine comprises a flaw detecting means for scanning the entire surface of a roll ( 11 ), provided with an ultrasonic...
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6396234 |
Servo control apparatus and servo control method
A servo control apparatus for performing a feedback control to a controlled system having characteristics represented by a characteristic equation including at least a second order term, a first...
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6377900 |
Measuring system for transfer function matrix of a system to be controlled in multi-degree of freedom vibration control
A measuring system for measuring a transfer function matrix of a system to be controlled by applying sine-wave excitations to a test object simultaneously by multiple number of vibrators. In the...
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6324933 |
Planar movable stage mechanism
Apparatus for moving a platform in X and Y directions including a first shaft secured along a first edge of the platform and oriented axially in the X direction and a second shaft secured along a...
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6323790 |
R/D converter
There is provided an R/D converter capable of realizing a high speed response. When a sine wave for excitation of a resolver is a positive (or negative) maximum value, an AD converter makes AD...
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6294892 |
Method of manufacturing organic thin-film EL device
In a method of manufacturing an organic thin-film electroluminescent device, a plurality of thin-film luminescent portions are arranged with fine pitches on a substrate. Each of the luminescent...
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6274994 |
Servo control apparatus
In a servo control apparatus in which a machine system is driven by a servo motor, a phase compensation device is provided. The phase compensating device calculates a speed component (phase delay...
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6255794 |
Procedure for the digital evaluation of analogue resolver output signals
In a procedure for the digital evaluation of the analogue output signals from a resolver with at least two stator windings, arranged perpendicular to each other on a stator, and at least one rotor...
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6252368 |
Numerically controlled system and backlash compensation device for use with the system
A backlash compensation device for use with a numerically controlled system compensates for a position command signal used to drive and control an object to be controlled. The device includes a...
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6246201 |
Electronic cam control system
An electronic cam servo apparatus uses a digital servo controller to perform motion equivalent to a mechanical cam. The control apparatus has one data table representing a characteristic of a...
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6232736 |
Numerical control machine tool positioning system
The present invention is embodied in an automated system for the positioning and support of a machine tool within a workpiece supporting assembly, comprising a pair of generally parallel, planar...
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6218800 |
Control system, driving system and control method, apparatus including the driving system
A control system in accordance with the invention comprises error signal generating means for generating an error signal in response to a reference signal and a first and a second position signal....
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6204622 |
Position controller
A position controller has a command generator for generating position instructions, a position control unit for controlling a position by inputting a position instruction and the position of a...
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6192285 |
Controller for work transfer system
A controller for a work transfer system, capable of performing precise positioning of feed bars during sole driving of the transfer system and simplified in structure to contribute to savings in...
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6184645 |
Voltage mode drive for control circuit for an actuator using sampled back EMF control
An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first...
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6184637 |
Electric power steering apparatus
Electric power steering apparatus includes a control nit for controlling an electric motor to impart electric steering assist torque to the steering system of an automotive vehicle. The control...
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6184644 |
Deflection-error-reduced position control apparatus for ball screw drive system
In an apparatus for controlling the position of an object driven by a servomotor via a ball screw drive system, parameters of the ball screw drive system are determined from a position command...
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6170506 |
Method and circuit for actively cleaning electrohydraulic valves in a hydraulic control valve circuit
A method for cleaning a solenoid-operated regulator valve wherein command current applied to a solenoid actuator establishes a defined response of a valve. Cleaning current pulses applied to the...
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6166508 |
Process for controlling the displacement of the window pane of a motor vehicle door
A method for controlling a movement of a window pane of a motor vehicle door immediately after the lowering of the window pane, until there is compensation of the system deficiency of the...
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6154000 |
Apparatus for providing a controlled deflection and/or actuator apparatus
Apparatus for compensating for positioning, pointing and/or orientation errors caused by deflections of structural members and components of a high performance machine or device and/or for reducing...
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6147467 |
Dynamic compensator for use in servo loop for optical pickup head
A servo loop, including a dynamic compensator, for use in an optical disk player is provided. The optical disk player reproduces data over the optical disk. The pickup head reads data on a data...
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6147468 |
Servo control method for orbital machining with cutting tool and servo control system for orbital machining
For an orbital machining in which a spindle having a cutting tool attached thereto and a work to be machined are moved, by feed shaft control, to make a relative displacement to each other along a...
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6144182 |
Motor control method for injection molding machine and motor controller for carrying out the same
The duty of a current to be supplied to an injection motor is calculated on the basis of the ratio between set injection time for which the injection motor operates and molding cycle time, a shaft...
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6140791 |
Method and apparatus for controlling the acceleration trajectory of positioning a high-velocity transducer and for reducing the harmonic content thereof
A sinusoidal acceleration trajectory controller is used in positioning a transducer at high speed to minimize vibration and acoustic noise. The controller reduces vibration and acoustic noise...
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6140784 |
Power off velocity control for disk drives
A method and circuit for controlling a voice coil motor (VCM) for a disk drive actuator assembly such that the actuator assembly moves to a landing area at a constant velocity when the disk drive...
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6133705 |
Motion controller
A numeric array of move command data Qi constituting a reference cam diagram F (θ) is stored in advance in a data table of a CMOS memory. Alternatively, a shift position of a cam corresponding to...
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6130517 |
Magnetic actuator producing large acceleration on fine stage and low RMS power gain
A pair of complementary magnetic actuators controls a stage in a high-precision positioning instrument in a single coordinate direction. Additional pairs of complementary magnetic actuators can be...
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6115205 |
Method for adapting seeks of a disc drive transducer to the maximum actuator current available to accelerate and decelerate the transducer
A method for adapting acceleration and deceleration of a disc drive transducer during movements between initial and target tracks on a disc surface to the maximum current available to drive an...
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