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4904917 |
Drive apparatus
Drive apparatus, particularly for a twin polygon thermal scanner, utilizes a stepper motor driven by pulses of variable width timed, relative to the rotational position of the motor, so that the...
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4901000 |
Variable rate stepper motor driver circuit and method
A circuit inserted between a microprocessor controller and a stepper motor driver uses a detector to detect single peak or double peak pulses from the controller and selectively produce one or two...
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4899267 |
Spotlight and control system therefor
A multifunction spotlight and control system therefor, the spotlight functions each being adjustable by a bipolar stepper motor, a control means such as a dimmer unit for enabling analogue control...
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4897590 |
Track access apparatus in a magnetic recording/playback system
Disclosed is an apparatus for gaining high-speed random access to a track in a magnetic recording/playback system of the type in which a magnetic head is shifted to an adjacent track in response to...
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4897589 |
Apparatus for indexing an origin of a moving member
Disclosed herein is an origin indexing apparatus applicable to a printer. A moving member, such as a printing head mounted on a carriage, is moved by a stepper motor which rotates in stepwise...
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4896105 |
AC electric energy meter having drive circuit including stepper motor for driving mechanical register
An AC electric energy meter is coupled to a source of AC electrical energy and to an AC load. A sensing circuit senses the amount of AC electric energy consumed by the AC electric load. An AC...
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4896088 |
Fault-tolerant switched reluctance machine
A switched reluctance motor drive or generator takes advantage of the characteristic independence of concentrated phase windings to optimize fault-tolerant operation. No "dead zones" in motor...
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4896089 |
Fault management system for a switched reluctance motor
A fault management system for a switched reluctance motor detects faults through phase current differential sensing and phase flux differential sensing and isolates any fault by deactivating any...
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4890105 |
Step data processor for 180X and 90X compass synchro data
A compass data converter converts 180X and 90X synchro compass data to 1/6 degree step data. 180X synchro data is converted by utilizing a 360X to 1/6 degree step data converter that divides the...
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4890048 |
Low torque ripple stepping motor controller circuit
A stepping motor controller supplies a pulsed input signal to a motor driver controlling rotation of a stepping motor. To accelerate or decelerate the motor, the controller linearly increases or...
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4888542 |
Driving method of a stepping motor
The present invention relates to a driving method of a stepping motor, wherein the hold position of the motor does not change and further no complicated control is required in controlling current...
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4888541 |
Method and apparatus for controlling stepmotor mechanical drives
A method and apparatus for controlling stepmotors having a broad range of applications including fuel control for gas-turbine engines, and operating powered automatically controlled doors for mass...
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4884016 |
Closed loop torque angle control of synchronous motor
A closed loop motor system having a motor with a plurality of poles and motor windings associated therewith. The poles define full step motor output positions. The system is of the type that...
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4882530 |
Stepping motor control apparatus
In an all-phase de-energized state of the stepping motor, all motor windings having different phases are energized. After the all-phase de-energized state is detected, the motor windings are...
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4876618 |
Method for detecting zero track
A magnetic disk drive device includes a rotatable disk. The disk has at least data tracks and guard band tracks. The data is previously recorded on the data tracks in the reversed magnetization...
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4869610 |
Carriage control system for printer
A carriage control system for a printer which effects printing by moving the carriage mounted on a print head to reduce the distance on either side of the printing area required for acceleration...
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4868478 |
Motor energizing circuit
Energizing system for a reluctance motor having at least two phases. A sensing and control circuit (1-5) which is constructed to indicate the inductance, or a clearly related magnitude, in the...
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4868477 |
Method and apparatus for controlling torque and torque ripple in a variable reluctance motor
Apparatus for controlling torque and torque ripple in a variable reluctance motor uses a generated torque waveform for each phase of the number of phases associated with the motor and corresponds...
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4862051 |
Stepping motor's negative-phase braking control device
A negative-phase braking control device for accurately stopping a plural-phase stepping motor in a very short time. The negative-phase braking control is performed by comparing the present position...
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4859923 |
Microprocessor controlled dual channel closed loop controller for stepper motors used in servo systems
A controller for stepper motors used in servo systems is implemented for being controlled by a microprocessor via appropriate input/output circuitry. Upon application of discrete commands, the...
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4858103 |
Fluid valve control system for controlling fluid pressure or flow
Controlled variable table data, which consist of pulse number data corresponding to the maximum controlled variable of a fluid valve and divided into N divisions in each of which given pulse number...
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4857817 |
Drive circuit for stepping motor
In this invention, an excitation current is switched in accordance with a change in number of phases so as to reduce an excitation current per phase in a 2-phase mode to be smaller than that in a...
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4851766 |
Fault diagnosis system for rotor winding of rotary electric machine
A fault diagnosis system for a rotor winding of rotary electric machines is disclosed, in which the rotor winding of rotary field type is excited in DC fashion by an excitation circuit, on which an...
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4851755 |
Low power stepper motor drive system and method
A system and method for driving a stepper motor utilizing a near minimum amount of driving power is described. A stepping detector is utilized to determine whether the motor has actually stepped in...
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4845417 |
Driver for stepping motor
A driver circuit for a stepping motor includes first and second windings for two-phase magnetization to give a magnetomotive force to the stepping motor. A first control signal and a second control...
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4843294 |
Solar array stepping to minimize array excitation
Mechanical oscillations of a mechanism containing a stepper motor, such as a solar-array powered spacecraft, are reduced and minimized by the execution of step movements in pairs of steps, the...
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4841214 |
Control device for a stepping motor
A control device is provided for a stepping motor which connects with a drive system comprising a somewhat resilient member exerting a rebound force, such as a gear for the platen or a wire for the...
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4837493 |
System for driving drum
A system for driving a drum includes a pulse motor including an annular rotor fixedly mounted within the drum for rotation therewith and rotatable relative to a stator disposed within the rotor....
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4836387 |
Deflection gate driven by stepper motor
Apparatus for sorting articles and comprising a deflector movable between first and second positions to ensure that an arriving article will follow one of two paths, a stepping motor (20), the...
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4835451 |
Switching circuit for five-phase stepping motor and method of switching
The invention relates to a switching circuit for a permanently excited five-phase stepping motor with a pentagonal circuit of series-connected stator windings. The junctions between neighboring...
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4833593 |
Method for preparing information tables for a digital valve control apparatus
An external system for preparing information tables is connected by a connector to a digital valve control system which controls a digital valve by driving a pulse motor according to the...
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4833385 |
Method for the phase synchronization of step-drive controlled equipment
A method for the phase synchronization of step-drive-controlled equipment, in particular of optical modulation devices for multiple-beam spectrophotometers. Starting with the phase comparison of a...
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4833372 |
Control circuit for electric motor
A control circuit can drive an electric motor such as a stepping motor and a DC torque motor within a wide supply voltage range so that its rotor follows a selected speed pattern without error. The...
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4831320 |
Duty factor control method
A duty factor control method for electromechanical actuators which can take only mutually discrete positions. A required quantity of state R which is in intermediate condition between two discrete...
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4829222 |
Stepper motor driver control circuit
A driver circuit is under the control of a microprocessor and in communication with a stepper motor. The stepper motor is in driving communication with a mechanism. A power source having a first...
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4827200 |
Velocity control unit of detecting head
A velocity control unit of a detecting head consists of a differentiation circuit for differentiating a reference velocity signal and feeding it via an analog switch to a first-order lag circuit...
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4825133 |
Electromechanical actuator control system
An electromechanical actuator includes an electric motor and a control and drive circuit mounted integrally with the electric motor. The control and drive circuit includes a serial-to-parallel...
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4825313 |
Method for adjustably positioning a transducer for a disc drive
A method of adjusting the position of a magnetic head in a magnetic head positioning mechanism positions the magnetic head at a target track on a magnetic disk. Since a floppy disk system is so...
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4821644 |
Method and apparatus for positioning a member
The method utilizes an encoding switch to derive encoded position signals representing the current position of a member such as the print element of a franking machine. The switch has conductive...
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4822019 |
Electronic equipment utilizing forward/reverse rotation of motor
A cut sheet feeder feeds out a cut sheet from a first paper cassette when a bidirectional pulse motor for driving paper feed rollers rotates forward and from a second paper cassette when the...
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4820963 |
Driving device for step motor
A step motor driving device comprises a single control circuit and a single voltage generating circuit for controlling plural step motors, each step motor being connected to a drive circuit. The...
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4817007 |
Machine tool control systems
A machine tool has a workpiece which is rotated by a motor. The tool is moved by a tool drive to machine a required surface profile on the workpiece and is also indexed on a carriage. The stepping...
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4816756 |
Circuit and method for statically testing rotating rectifiers in brushless alternators
Rectifiers mounted on the rotor of a brushless alternator are tested by applying an AC voltage to an exciter field winding of the brushless alternator. This applied voltage induces current in a...
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4812059 |
Printer apparatus with automatic gap adjusting mechanism
A printer apparatus including a timer, for setting a period T1 when the print head moves forward toward a platen, and a period T2, which is longer than period T1, when the print head moves away...
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4812727 |
Stepping motor drive device
A stepping motor drive device including a comparator for comparing the number of drive steps with a prescribed value and a control circuit for changing the operation of the stepping motor between a...
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4806834 |
Electrical circuit for inductance conductors, transformers and motors
An electrical circuit for inductance conductors, transformers and motors is provided wherein two coils of electrically conductive wire are coiled about a bar of magnetizable material such that they...
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4803414 |
Method of controlling a step motor
A method of controlling a step motor for rotating and halting a rotor of the step motor at a predetermined position by applying a driving voltage or a holding voltage lower than the driving voltage...
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4803415 |
Stepper motor control circuit and apparatus
The present invention relates to a motor control circuit for a stepper motor which causes a motor shaft to oscillate between an incremental rotational position nearest above and nearest below a...
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4800334 |
Method of analyzing the voltage induced in an exciter coil of a stepping motor
A method of analyzing the voltage induced in an exciter coil of a stepping motor. After energization the exciter coil is loaded by a low impedance so that the induction voltage can produce a...
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4799002 |
Method of driving a five-phase stepping motor
A five-phase stepping motor system includes phase windings connected in series with each other to form a ring and pairs of switching devices connected in series with each other, with each pair...
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