|
Match
|
Document |
Document Title |
|
|
4673857 |
Method for driving a turn detector circuit which detects the turn of a step motor
A detection circuit having a normally open low impedance loop comprised of a step motor coil and a low impedance element, and a normally open high impedance loop comprised of the step motor coil...
|
|
|
4672282 |
Stepping motor control circuit
Circuitry for measuring the torque of a stepping motor is disclosed. The circuitry is based on the fact that the decay time of the current flowing through the stator coils is a function of the...
|
|
|
4672283 |
Control circuit for stepping motor
A control circuit can drive a stepping motor within a wide supply voltage range without step-out of the rotor. The control circuit includes an A/D converter for converting the supply voltage to the...
|
|
|
4667140 |
Battery powered motor drive with temperature-responsive battery heater
An improved battery powered quartz timing control circuit that drives a stepper motor, featuring a battery heated by a temperature-responsive battery heater which is activated when the ambient...
|
|
|
4665350 |
Open-loop brushless motor control system
The speed command for an open-loop brushless motor speed control system is overridden whenever the speed of the motor is less than a relatively low reference speed in order to quickly accelerate...
|
|
|
4663577 |
Driving circuit for multi-phase stepping motor
A driving circuit for a multi-phase stepping motor including an odd number of phase windings which are sequentially connected in series to each other so that a starting end of one winding is...
|
|
|
4663576 |
Automatic controller for magnetic jack type control rod drive mechanism
Apparatus and method are disclosed for continually generating data values (M) indicative of the time dependent waveform of the current (I C ) in a control rod latch actuation circuit (28), during...
|
|
|
4661754 |
Control circuit for a stepping motor
A control circuit comprises a first counter for counting up stepping pulses and counting down the number of steps of a stepping motor, a memory for storing therein a drive timing of the stepping...
|
|
|
4661882 |
Power supply/sink for use with switched inductive loads
A power supply/sink for use with switched inductive loads includes a transformer with a first secondary winding for generating power supply current connected in a circuit with a power supply...
|
|
|
4661755 |
Stepping motor control apparatus
A stepping motor control apparatus comprises two switching circuits and a control circuit. The first switching circuit stops the supply of excitation voltage to a stepping motor of a floppy disk...
|
|
|
4658194 |
Closed loop control circuitry for step motors
Control circuitry for a self-synchronously driven step motor under closed loop control includes, for determining the rotor position, a technologically simplified back EMF waveform detector circuit...
|
|
|
4652805 |
Tactile feedback apparatus for rotary manual input
An apparatus for rotary manual input utilizes an electromagnetic brake and control circuit to provide tactile feedback to the operator similar to that of a mechanical detent. A shaft connects a...
|
|
|
4652806 |
Micro-stepping translator controller
A micro-stepping translator controller for supplying current to a stepping motor having a plurality of windings comprises a power supply for supplying current to all windings and electronic...
|
|
|
4651076 |
Power maximizing circuit for stepper motors
A power maximizing circuit for a stepper motor employing a switching regulator that conducts current to a variable voltage supply until a predetermined voltage is attained. The predetermined...
|
|
|
4648026 |
Microprocessor stepper motor drive
A microprocessor stepper motor drive uses a single acceleration/deceleration profile regardless of the final velocity of the device being driven. A first down counter stores the desired final...
|
|
|
4647829 |
Means and method for stepping motor stabilization
A mid-range stabilization circuit for use in a multiphase stepping motor control system having motor current controllers responsive to first and second reference signal inputs, the current...
|
|
|
4644236 |
Drive restart control for ring spinning or twisting machine
A device for controlling the output speed of a motor of a ring spinning machine, a ring twisting machine and the like in case of replacing travelers of such machines includes a speed setter for the...
|
|
|
4642543 |
Starting sequence for reluctance motor drives operating without a shaft position sensor
A reluctance motor is started from standstill and accelerated to the rated speed of the motor without using a shaft position sensor. In this type of reluctance drive, if the motor fails to start...
|
|
|
4642537 |
Laundering apparatus
Control system for an electronically commutated motor includes circuitry for integrating the back emf of an unenergized motor winding to determine motor rotor position. However, integration should...
|
|
|
4642544 |
Control circuit for driving step motor
A control circuit for driving a step motor with at least first and second phase coils each having corresponding phase control elements. A memory stores phase switching data and is connected to the...
|
|
|
4641073 |
Stepper motor control system
A stepper motor control system for rotating a stepper motor by a desired amount of movement, including a first ROM (ROM 3 ) for storing acceleration control data, a second ROM (ROM 4 ) for storing...
|
|
|
4638195 |
Multiple-pole stepping motor
A multiple-pole stepping motor includes M stator windings distributed on M/2 groups and coacting with a permanent magnet rotor for hybrid stepper and a soft iron rotor for a variable reluctant...
|
|
|
4638235 |
Motor driving apparatus
A stepper motor driving apparatus drives a stepper motor with first and second stator windings inductively connected at one end. A power source section is coupled at one end to a chopper transistor...
|
|
|
4634948 |
Stepping motor winding for bipolar drive
A stator for a stepping motor, the stator having a plurality of salient poles and at least two windings, each winding comprising at least two conductors each of which is wound upon one or more...
|
|
|
4634949 |
Control devices for use with a stepping motor
A stepping motor generates first and second voltages each varying in accordance with a sinusoidal function having a period proportional to the period of rotation of the motor's rotor, the first and...
|
|
|
4635205 |
Microprocessor controlled d.c. motor for indexing postage value changing means
An improvement in combination with a postage meter including a rotary postage printing drum having apparatus for changing respective postage values to be printed, and including apparatus for...
|
|
|
4633346 |
Magnetic head positioning device for a flexible disk
A bead positioning apparatus includes a carriage for moving a magnetic head to a specified position of data tracks in a storage medium, a motor for driving the carriage depending on excitation...
|
|
|
4633156 |
Stepping motor assembly
The purpose of the invention is the realization of a motor assembly formed from a stepping motor and its control circuit capable of operating at a maximum speed substantially greater than that...
|
|
|
4631466 |
Phase locked stepper motor controlled light chopper
A phase locked loop stepper motor controlled light chopper for providing a specific pattern reversal rate. The stepper motor controlled light chopper includes a phase comparator for comparing the...
|
|
|
4631657 |
Control and force-sensing method and apparatus for motors
A method and apparatus for controlling a stepper motor and for force sensing and force control. Stepper motor drive waveforms are provided which are constructed of a sequence of stairsteps, the...
|
|
|
4631681 |
Microprocessor controlled d.c. motor and application therefor
An improvement in combination with a postage meter including a rotary drum having a periphery adapted for feeding a sheet in a path of travel. The improvement comprises: a first device for sensing...
|
|
|
4628239 |
Dual optical mechanical position tracker
Apparatus for retaining control of moving carriage impact dot matrix print eads when subjected to strong external forces such as shock and/or vibration. Position and direction of carriage movement...
|
|
|
4626760 |
Control circuit for a stepping motor
The control circuit comprises means for measuring current flow in the motor winding including an auxiliary transistor and means to form periodically a current mirror from such auxiliary transistor...
|
|
|
4626758 |
Digital valve control apparatus
A digital valve control apparatus for regulating opening of a digital valve by a pulse motor, comprising means for setting desired position and displacement speed of the pulse motor and means for...
|
|
|
4625667 |
Sewing machine with a step motor for feed control
In a sewing machine with a microcomputer controlled step motor for the control of the magnitude and direction of the feeding action of a cloth feeder, the microcomputer is connected, via a buffer...
|
|
|
4623828 |
Multiple phase stepper motor torque control apparatus and method
A control apparatus and method are disclosed for controlling the output torque of a multiple phase stepper motor, by turning OFF the normally excited phases for predetermined periods.
|
|
|
4622505 |
Device for controlling rotation of stepping motor
This invention relates to a device for controlling the rotation of the stepping motor in a printer. The device comprises a U-shaped frame member fixedly secured to the carriage of the printer and...
|
|
|
4618808 |
Electromagnetic actuator system using stepper motor with closed loop position sensing, electronic commutation and dynamic position and anomaly correction
Using as an actuator a stepper motor operated in a position-sensed closed loop mode via an electronic commutator by position and anomaly corrected motion control signals provided by a programmable...
|
|
|
4613806 |
Stepper motor logic circuit
A stepper motor logic circuit for providing stepper motor control signals to the drivers of a stepper motor. The stepper motor logic circuit receives programmable data from a CPU or...
|
|
|
4613962 |
Tracking device with linear motor
A device for tracking a movable body along a linear path parallel to a plane includes a linear motor for driving the body along the linear path. The body is mounted, as by rollers, for movement...
|
|
|
4612588 |
Head moving apparatus using stepping motor
A head moving apparatus using a stepping motor which comprises a reversible stepping motor for moving a head and a motor drive control apparatus for driving the stepping motor in alternate forward...
|
|
|
4611157 |
Switched reluctance motor drive operating without a shaft position sensor
A method and apparatus for operating a switched reluctance motor at high efficiency, without requiring a shaft position sensor, allows dynamic increase of the torque margin as the dwell angle of...
|
|
|
4609953 |
Disk unit
A disk unit including a control unit for controlling the stop position of a positioning electric motor and positioning a magnetic head operatively linked with the positioning electric motor on a...
|
|
|
4608958 |
Load reactance element driving device
A device for driving a load reactance element, such as a piezoelectric actuator for a fuel injection system, including a series reactance element connected in series with the load reactance...
|
|
|
4609857 |
Pulse motor driving circuit for floppy disc
A driving circuit for driving a pulse motor so as to move a head for a floppy disc supplies power to two phase coils using first applying means for directly applying the voltage of the power source...
|
|
|
4607204 |
Five-phase stepping motor
A five (5) phase stepping motor including a rotor rotated by electromagnetic field produced in a stator having coils, the first to the fifth inclusive, wound thereon and excited by driving signals...
|
|
|
4602882 |
Control system of serial printer
A serial printer includes a control circuit for driving the printer carriage. The control circuit detects the change of level of a home position signal in synchronism with a print position signal...
|
|
|
4603287 |
Method of driving 5-phase stepping motor
One end of each of coils of a group of phases A, C, and E among coils of phases A, B, C, D, and E which are wound in turn around stator poles of the 5-phase stepping motor is connected to one end...
|
|
|
4602197 |
Stepping motor control system
A system and method for controlling the operation of a dc stepping motor utilized for positioning a read/write head on a magnetic data storage disk operates to selectively establish different...
|
|
|
4600868 |
Open loop acceleration/deceleration control for disk drive stepper motors
An open loop controller for the stepper motor of a disk drive actuator is programmed to supply pulse width modulated drive voltages for energizing and de-energizing successive phases of the stepper...
|