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6111383 |
Controller for feeding chopped electricity
A rising saw tooth signal generating circuit generates a rising saw tooth signal having a constant amplitude and a constant period which corresponds to a frequency being slightly higher than the...
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6107774 |
Apparatus and method for controlling drive of three-phase multiplex winding motor
In vector control apparatus and method for a three-phase multiplex winding motor, a plurality of inverters are installed, each inverter operatively driving a corresponding one of multiplex windings...
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6107771 |
Move command correction method and servo control system with correction of move command
An amount of difference between a commanded position and an actual position resulting from reversing a direction of movement is found before machining and is stored in a memory of a positional...
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6094022 |
Low jitter zero crossing BEMF detector and motor incorporating the same
A BEMF detector and method detect the BEMF of a three-phase motor using a fully differential detection system. The motor has a first coil coupled between a first coil tap and a center tap, a second...
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6064170 |
Method of controlling a printhead movement based on a screw pitch to minimize swath-to-swath error in an image processing apparatus
An image processing apparatus (10), typically for sheet thermal print media. The image processing apparatus (10) typically comprises a vacuum imaging drum (300) for holding thermal print media (32)...
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6060854 |
Method and apparatus for compensating for windup in a machine
A method and apparatus for compensating for the effects of compliant elements in a positioning system is provided. The amount of compensation to be applied can be determined by measuring the lost...
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6054833 |
Disk drive having improved head-velocity control, and method therefor
A disk drive has a servo controller that regulates the velocity of a data-transducing head as the head is moved between a parked position and a data-transducing position within the drive. The head...
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6043623 |
Current compensation system for driving electric motor
A current compensation system for an electrical brush motor senses the amount of current by the electrical motor and generates a signal quantifying the amount of current drawn by the motor so that...
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6040674 |
Motor driving device, method of adjusting the same, and information storage device
A method of adjusting a motor driving device which performs current-feedback PWM drive, the motor driving device, and an information storage device are provided. According to the present invention,...
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6037730 |
Degraded electronic throttle operation method and system
An electronic throttle assembly uses a torque motor and mechanical system to position the throttle. The assembly is configured to keep the throttle slightly open during times of electrical power...
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6034498 |
Servo adjustment method and apparatus therefor
Response delay error is calculated from an instructed position based on a position of a moving body and a position instruction to detect reversal of a servo motor and to compare response delay...
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6013990 |
Monitoring power supply voltage to hard disk drive
A hard disk drive for supplying a power supply voltage by monitoring a power supply voltage and method of controlling the same. The hard disk drive includes a power supply monitor circuit for...
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6011902 |
Motor control circuit
In an optical disc player, as signals are read from and written to an optical disc, the optical disc is rotated by a spindle motor and an optical pickup is moved by a sled motor. These motors are...
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6008617 |
Motor control device for high frequency AC driven motor
A motor control device for an AC motor driven by a power converter with a maximum output frequency more than 500 Hz has a digital arithmetic unit which performs current-feed back control of the AC...
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6005364 |
Rotor position measurement
A motor monitoring and control circuit calculates a value parameter for a position of the motor at given instants. The same parameter (which may be position or speed of a rotor) is then measured at...
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5977738 |
Method and system for contolling the position of a servo motor in vehicle speed control systems for various operation conditions
A method and system for accurately controlling a position of a servo motor in a vehicle speed control system for various operation conditions includes predetermined parameters of a polynomial which...
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5973467 |
Velocity control device using servo motor
A velocity control device controls a velocity of an object via a servo motor so that a damping phenomenon during acceleration or deceleration and a swelling phenomenon of a specified frequency...
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5973471 |
Micromanipulator system with multi-direction control joy stick and precision control means
A micromanipulator system is comprised of a microscope, a micromanipulator for three-dimensionally manipulating a fine instrument in the field of the microscope, image pick-up device for picking up...
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5973470 |
Compensation for generic servoamplifier usage with high performance direct drive valves
A compensation design allows for use of a generic servoamplifier for multiple types of actuator Direct Drive Valves (DDV). Cost savings can be realized by using common electronics applied to...
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5973468 |
Magnetic bearing devices
To provide magnetic bearing devices capable of preventing undesirable consequences caused by conical mode or parallel mode resonance which is liable to occur during acceleration of a rotor. A...
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5955855 |
Method and system for tuning a drive to its coupled motor to minimize motor resonance and sensing device for use therein
A method and system are provided for tuning a drive to its coupled stepper motor to minimize motor resonance wherein an electronic accelerometer is mounted in a coupler such as a slip clutch to...
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5952806 |
Inner force sense controller for providing variable force to multidirectional moving object, method of controlling inner force sense and information storage medium used therein
An inner force sense controller includes an actuator for exerting a reaction force on a moving object such as a manipulator, a sensor for producing a detecting signal indicative of current position...
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5952804 |
Servo control method and servo control system for feed drive system
Letting a differential value of a command value of a position command to a position control loop be an input variable, a feed forward compensation value is calculated depending on the input...
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5945796 |
Power window control apparatus
Disclosed is a power window control apparatus which is enhanced in the precision of judging when a foreign matter is caught by a vehicle window in its closing stroke, and is capable of preventing...
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5939852 |
Stage feeding device
A stage feeding device has a movable guide which is guided on a reference surface of a platen to be movable in the Y-direction, a Y-linear motor for moving the movable guide in the Y-direction, a...
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5932985 |
Process of controlling numerically controlled back-and-forth running treating machine
A treating period T=L 0 /V is determined from a preset treating length L 0 and a stock running speed V. An advancing acceleration is made as small as possible consistent with a requirement that...
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5929587 |
Method and apparatus for controlling servomotor in two inertial systems
A servomotor controlling method and apparatus for use in two inertial systems in which the servomotor and a load are mutually connected by an elastic connection element is provided. A compensation...
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5910720 |
Cross-shaped torsional spring
The invention provides an elastic actuator consisting of a motor and a motor drive transmission connected at an output of the motor. An elastic element is connected in series with the motor drive...
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5902342 |
Detection of vibration in an AC traction system
An electric powered vehicle includes a traction motor powered from a source of switched DC power. The motor includes a tachometer for measuring the rotational velocity of the motor and for...
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5900709 |
Rotation control device
In a rotation detection apparatus, a magnetism pattern section provided with plural magnetic poles and a FG (frequency generating) pattern section provided with plural toothed wire circuits are...
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5886492 |
Servo control apparatus and method for video cassette tape recorder
An improved servo control device and method for a VCR that minimizes jitter caused in a reproducing mode of the VCR (reproducing VCR) when it reproduces a video signal recorded by another VCR...
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5886491 |
Position control unit for electric motor
The present invention provides a position control unit having a torque command computing device (a position control circuit, and a speed control circuit) for outputting a torque command signal...
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5880573 |
Low-cost phase-lock motor control method and architecture
A motor control system provides a low-cost method of phase-locking a motor to an input timing signal. Timer circuits 502, 506 measure the period of a timing signal and the relative phase between...
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5872439 |
Motor control device
A motor control device for controlling a swing motor which moves a head is provided with a disturbance observer and an operation suspending unit. The disturbance observer outputs a compensating...
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5869941 |
Air breaking type machine tool
The present invention provides an air bearing type machine tool capable of carrying out a process with a high load for cutting iron or the like and controlling the degree air is used. The air...
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5862301 |
Motor control with clamped filter output
A motor control circuit, including a filter amplifier which includes a clamping circuit to limit the maximum voltage of the filter amplifier. The filter amplifier is clamped to essentially the same...
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5856732 |
Servosystem
The servosystem includes adjusting means (1) for changing the position of mechanical element (3), a first transducer (5) for forming an adjusting voltage which is a measure of a desired position of...
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5852996 |
Throttle valve positioning control apparatus
An apparatus for controlling the positioning of a throttle valve situated to control the amount of air permitted to enter an internal combustion engine operable in a plurality of control modes. The...
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5847527 |
Method and apparatus for digital position control
A digital position control system having a model of a plant therein is applied to a head position control system for a HDD in which a head moving unit is made to be a plant. A CPU of the HDD...
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5847524 |
Constant speed control for a motor
A motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating...
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5844390 |
Method and apparatus for regulating a fluid operated machine
A fluid operated machine is monitored and regulated by providing a logic with a memory for storing the timings of properly operating functions, and detectors the outputs of which are used to...
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5841263 |
Frequency dependent current control system for an AC motor
In a method and apparatus for motor control in an electric vehicle, current feedback control from an AC motor is performed using a digital arithmetic unit. The motor control equipment includes a...
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5834918 |
Self-tuning tracking controller for permanent-magnet synchronous motors
A self-tuning tracking controller for permanent-magnet synchronous motors is disclosed, providing for velocity or position trajectory tracking even when both the electrical and mechanical...
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5814962 |
Servo controller
A servo controller for servo-controlling an operative device, the servo controller is provided with an actuator having a motor for actuating the operative device; a sensor for detecting an...
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5808439 |
Satellite small angle tilting mechanism
A satellite mechanism is provided for tilting a directional device such as an earth sensor, telescope, antenna, reaction wheel, etc. through a small angle using flexural supports which provide...
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5808437 |
Method for compensation of periodic shaking forces in an electrical rotating field machine
A method for the compensation of periodic shaking forces in an AC-machine having a special winding for the combined generation of a torque and a transverse force. The compensation takes place by a...
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5796231 |
Rotation position detecting device and motor device
A rotation position detecting circuit for a sensor-less motor and a motor device include a motor (1) which is rotated and driven by adding a sensor signal having a high frequency to a sine wave...
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5780989 |
Method and apparatus for AC servo motor control
The present invention relates to an AC servo motor control is disclosed, in which a voltage command is produced from the deviation between a current command and feedback current for the AC servo...
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5773952 |
Self correcting arrangement for self compensation of an operating position servo
A device for providing self compensation of an operating position servo, as when external forces influence movement of a movable object, for example, when turning a wheel chair seat, has a position...
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5767649 |
Motor load switching system
A motor load switching system in which a single motor with a single control circuit drives a plurality of different-sized loads by sequentially switching from one load to another. A parameter...
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