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RE41036 |
Linear actuator control structure
A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational...
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7612513 |
Control device equipped with motor protection function
A synchronous motor control device having an optimal protection function in accordance with an operational state of a motor is provided. The motor control device includes a position detecting...
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7423403 |
Motor control system
A motor control system which can realize current detection with high accuracy by using an amplifier having an ordinary level of accuracy and can avoid deterioration of current detection accuracy...
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7245103 |
Motor speed and position control
A method of controlling the speed and position of a motor includes receiving a pulse train indicative of the speed of the motor, and a periodic signal at a frequency greater than the pulse train....
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7235937 |
Traction motor control system
For controlling a traction motor of a vehicle, a current command value is determined based on a torque command and a load value representative of running load of the vehicle. A voltage command...
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7233125 |
System and method for controlling an induction motor
A system controls an induction motor driven by a power inverter circuit. An operational amplifier circuit is operatively connected to the power inverter circuit and operative therewith for sensing...
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7109680 |
Inverter device
An object is to provide an inverter device capable of realizing exact protection of the winding of a motor. An inverter device for generating a pseudo alternating current by switching a direct...
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7106012 |
Electronic control unit, electric power-assisted steering device and transmission ratio-variable steering unit
An electronic control unit for producing a sufficiently boosted voltage even when a supply voltage becomes high includes an inverter that drives switching elements and converts a DC voltage into an...
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7081731 |
Translatory actuator unit
A translatory actuator unit including a translatory actuator module that moves an object straightly, a force sensor that detects a load applied to the translatory actuator module, and a servo...
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6933699 |
Motor drive circuit and method with frequency setting and correcting functions
A motor drive circuit and method with frequency setting and correcting functions. The drive circuit includes a speed control device, which simultaneously receives a sense signal and a rotation...
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6847179 |
Actuator position control with signal sensing
An actuator position control system for brush-type DC motors. The system includes a sensor, amplifier or differentiator, central control unit (microprocessor), and motor driver. The system utilizes...
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6763804 |
Electronic throttle servo overheat protection system
A method for controlling a positioning device ( 34 ) of an internal combustion engine includes the step of providing an electric motor ( 30 ) for actuating a positioning device ( 34 ). A user...
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6614195 |
Linear actuator control structure
A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational...
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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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6605920 |
Method and apparatus for large motor control
Apparatus and method for providing digital signal processing method for controlling the speed and phase of a motor involves inputting a reference signal having a frequency and relative phase...
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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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6448732 |
Dual mode portable suction cleaner
A vacuum cleaner operates via power supplied from either an on-board battery or an AC power outlet. When the vacuum cleaner is operating by using the battery a controller monitors the voltage level...
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6291962 |
Offset control circuit and offset control method
When a playback signal of recorded data which is a DC free code has non-linearity, the playback signal is equalized by a waveform equalization unit, and sampled by an analog-to-digital converter....
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6211636 |
Pressing machine and motor torque control method in pressing machine
A torque command Tc is restricted to a torque limit value Tm' by torque limiting means and delivered to current restricting means for a motor. The torque limit value Tm' is derived by adding a...
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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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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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5736826 |
Dual hysteresis control circuit
A control circuit, in particular for a direct current control in positioning systems, comprising a differential circuit (1), a control logic (2) and a full bridge (3) connected between a supply...
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5729067 |
Method and apparatus for closed loop position control in a linear motor system
An improved method and servo control apparatus (C) is provided for controlling the motion of a linear electric motor (A) which in turn generates motion command signals to various apparatus such as...
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5654840 |
Hard disk drive which uses the back EMF of the actuator to detect shocks
A disk drive for operating in an environment in which the drive is subject to physical shock includes a circuit which senses movement of a transducer head support arm which result from a shock's...
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5650705 |
Apparatus and method for controlling currents in an inductor
A motor control system (10) for controlling a multiple number of motors, each motor having a multiple number of phases. System (10) can be used to dynamically vary the step sizes from microsteps to...
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5627421 |
High efficiency drive circuit for an active magnetic bearing system
A plurality of electromagnetics in an array surround a shaft, with current controlled in the coils of the electromagnets to support the shaft at a desired position approximately centered between...
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5559416 |
Direct current motor control circuit in positioning systems
A control circuit, in particular for a direct current control in positioning systems, comprising a differential circuit (1), a control logic (2) and a full bridge (3) connected between a supply...
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5420490 |
Apparatus and method for compensating for warm-up drift in a servo motor
A register stores the value from the integral controller of the PID controller whenever it receives a feedback signal. A main controller outputs a warm-up drift compensation value whenever the...
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5418439 |
Apparatus and method for discriminating position information in a position control system
An apparatus and a method for discriminating position information in a position control system. The apparatus includes a position detector for detecting information regarding a current position of...
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5332956 |
Motor rotation controlling device
A motor rotation controlling device, usable for example in a video recorder, to minimize transient phenomena at an initial operation and shorten a transient response time for detecting a rotation...
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5192901 |
Short circuit protection
In the transistor power output stages disclosed herein, short-circuit protection is provided with respect to output terminals through which a reversible motor or other load is to be energized. An...
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5179494 |
Excess voltage protection apparatus for an electric vehicle
A protection device is provided for a control apparatus for use in an electronic automobile with a motor and a transistor for driving the motor. The protection device comprises a short-circuit...
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4945298 |
Motor driving apparatus
A motor driving apparatus includes a motor, a signal generating device for generating a Pulse Width Modulation binary signal, a control device for applying a current to the motor, a current...
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4885676 |
Control loop instability detection and correction apparatus
The control loop instability detection and correction apparatus monitors an error signal produced by a control system to detect any instability in the control loop before the instability...
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4649486 |
Control method for continuously variable transmission or the like
In order to prevent belt slippage induced by overly rapid depressurization of a chamber forming part of a continuously variable transmission V-belt pulley control arrangement, and simultaneously...
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4636701 |
System for controlling rotation of rotary mechanism in Z-type propulsion apparatus
A control system for controlling the rotation of a rotary mechanism such as a propeller housing in a Z-type propulsion apparatus is provided. A command signal and a feedback signal both relating to...
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4613961 |
Optical reader with a limiter in the tracking or focus error servo control loop
Faults in servo control systems as a result of, for example, signal spikes caused by defects such as thickness variations, air bubbles, and scratches and dust particles on the substrate of the...
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4562389 |
Automatic screwdriver or torquing tool control system
To permit reliable turn-OFF of the motor when the torque of the motor is sufficient to provide for reliable seating of a screw or nut being driven thereby, start conditions of the motor are sensed,...
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4518909 |
Set value transmitter for a drive regulation apparatus
With this set or reference value transmitter which is controlled by a set or reference value clock pulse generator or transmitter regulation of the running-up or acceleration of electric motors,...
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4412164 |
Lens system driving device
A lens apparatus for moving one or more moving lenses of a lens system up to the end position of movement by a servomotor. The lens apparatus limits the moving speed of the moving lens or lenses to...
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4300080 |
Power driver control circuit for servo actuator
A power driver control circuit (38) provides control signals (44, 46, 48, 50, 52, 54) for switching transistors in a power driver (56) for an electromagnetic actuator (11) of the type used for...
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4290000 |
Power amplifier with current limiter circuit
A power amplifier is disclosed for controlling the current flow through a load, such as a d-c servo motor. The amplifier includes a plurality of switching elements connected in bridge fashion with...
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4270164 |
Short circuit protection for switching type power processors
A power processor having a switching type output is provided with protection against short circuit current flow. A transformer is provided with the primary windings connected in series with the...
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4096562 |
Closed loop control systems and control devices for such systems
Method of controlling a variable in response to an error signal by comparing a signal correlated to and substantially proportional to the controlled variable with a reference signal corresponding...
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4088182 |
Temperature control system for a J-module heat exchanger
The level of primary fluid is controlled to change the effective heat transfer area of a heat exchanger utilized in a liquid metal nuclear power plant to eliminate the need for liquid metal control...
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3974433 |
Automatic control apparatus with saturation element
An automatic control apparatus comprises a means for detecting deviation of an actual value from a target value of a controlled quantity for the control operations and a damping feedback means, at...
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3950687 |
Servo-mechanism for controlling velocity and position of a controlled member
A servo-system for controlling position as well as rate of movement of a controlled device. Any command signals are processed or shaped prior to comparison with the feedback position signals. This...
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3942087 |
Track system for steered, untrack vehicles
To prevent sudden and violent control swings in the guidance system of vehicles which are guided in a guide path by sensing an electrical or magnetic field derived from a guide track conductor,...
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3935523 |
Non-minimum phase linear controller for hydraulic mechanisms
The disclosure relates to a non-minimum phase linear controller which uses positive servomechanism rate feedback to control hydraulic mechanisms. The disclosure also relates to a controller...
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3848833 |
AIRCRAFT AUTOMATIC FLIGHT CONTROL SYSTEM
An automatic flight control system for aircraft providing improved aircraft response to input displacement commands, especially of the generally step input type, in a simple and economical manner;...
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