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Document Title |
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4723855 |
Compact printer
A compact printer has a type drum having at least one row of types, the types, including at least one space, being arranged on the periphery of the drum at regular intervals. The type drum is...
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4723103 |
Control equipment for an electro-magnetic linear motor
A control apparatus for a linear motor, having main and auxiliary driving coils and which drives a movable plate is disclosed. The control apparatus, which determines if the plate is within an...
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4721896 |
Drive controlled by a sequence of pulses
The invention relates to drive controlled by a sequence of pulses and which in place of a stepper motor with its associated circuit makes use of a continuous displacement motor, such as a DC motor,...
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4720726 |
Shutter driving apparatus
A shutter driving apparatus drives a programmed shutter with a stepping motor, by using a driving current pulse whose waveform has a leading half that gradually increases in amplitude and a...
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4717866 |
Stepping motor excitation sequences
A method and apparatus for driving a stepping motor in its single stepping mode of operation by supplying a series of alternate forward and reverse phases whereby the motor is caused to rotate...
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4714361 |
Stepper motor homing method and system
A method or system for bringing a movable element of a stepper motor to its home position by mechanically blocking the movable element from further moving from the home position, wherein the...
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4714867 |
Method and apparatus for controlling a stepper motor with a programmable parabolic velocity profile
A stepper motor is accelerated and decelerated with a parabolic velocity profile to efficiently utilize the available torque of the motor. The times between pulses to obtain a parabolic velocity...
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4713594 |
Start-up control for switched reluctance motor
A start-up control for a switched reluctance motor employs an encloder for generating a rotor position information signal for each stator phase and a start-up signal processor. The processor...
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4710691 |
Process and apparatus for characterizing and controlling a synchronous motor in microstepper mode
A process for characterizing the motion of a synchronous motor in microstep mode to achieve desired precise velocity motion at the final output. The motor velocity is directly proportional to the...
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4710690 |
Closed-loop control system for a stepping motor
A system and method for operating a stepping motor in start, run, and stop modes of operation. After the stepping motor is accelerated in the start mode, it is operated in the run mode by...
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4709199 |
Velocity feedback control of step motors
In a control system for a step motor having a rotor and stator, small velocity coils are placed in the stator in quadrature to the main power phase windings. The velocity coils provide velocity...
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4707650 |
Control system for switched reluctance motor
A programmable, closed-loop four quadrant control system for a switched reluctance motor employs feedback control, angle control and current control. The feedback control can be implemented with a...
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4707649 |
Motor controlling system
A motor controlling system in which a stepping motor can be always stopped at a constant or predetermined position. During initialization an excitation phase is stored after the motor has been...
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4706008 |
Self-adjusting homing for a stepping motor
For step motors positioned in response to an external reference location, correction for potential one step misalignment is provided. The method and the apparatus of the invention provide a...
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4703244 |
Pulse motor control apparatus
A frequency divided pulse is produced by frequency dividing a clock signal by speed instruction data. When the current position of the pulse motor has not yet reached a set desired position, a...
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4703243 |
Stepping motor harmonic suppression
A stepping motor including a plurality of stator poles wherein the stator poles are non-symmetrically displaced from their normal position to reduce harmonics in the torque/displacement crossing of...
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4703242 |
Control method and apparatus for positioning servo system
A magnetic disc head positioning system using a stepper motor eliminates positioning errors due to different approach directions and distances to a target track position through a drive control of...
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4701687 |
Controller for energization of a stepper motor
The present invention provides an N phase/N+1 phase energization type stepper motor controller for alternately energizing an N number and an N+1 number of phases where N is an integer equal to or...
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4700120 |
Control for a stepper motor or other synchronous motor
Closed loop control for a stepper motor or other synchronous motor. A digital/frequency interface provides drive current to the motor at a frequency determined by output of speed limiter. Required...
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4700321 |
Timing signal generator
Circuitry for providing timing signals spaced in time by a varying amount, the circuitry including calculating means for repetitively performing a calculation to repetitively provide calculation...
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4697129 |
Stepping motor drive system and method capable of stopping the rotor in a required angular position
In a stepping motor of the type having one or more sets of four phase windings on respective stator poles, with the four phase windings being excited sequentially to cause the rotation of a rotor...
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4692679 |
Pulse motor
A pulse motor comprises A-and C-phase coils wound on a common core with opposite polarities appearing on the core, B- and D-phase coils wound on a common core with opposite polarities appearing on...
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4692674 |
Brushless DC motor control system responsive to control signals generated by a computer or the like
A control system for a brushless DC motor responsive to digital control signals is disclosed. The motor includes a multiphase wound stator and a permanent magnet rotor. The rotor is arranged so...
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4691153 |
Method of controlling positioning of rotor of stepping motor
A method of controlling the positioning of a rotor of a stepping motor is disclosed. During the last step in a movement of the rotor to a desired rest position thereof, the windings of the stepping...
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4691154 |
Stepping motor control system
It takes a comparatively long time for a rotor of a stepping motor to be positioned at the next target stop position (target angular position) and stopped there. This time is the settling time....
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4688948 |
Electronic analogue timepiece of DC magnetic field detection type
In an electronic analogue timepiece driven by a stepping motor, DC magnetic field detector is connected to the stepping motor to detect the presence of an external DC magnetic field by comparing...
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4689541 |
Method and apparatus for controlling multiple motors
A method and apparatus are provided for simultaneously controlling a plurality of stepper motors. Addressing circuitry generates address data for each motor in a periodic address sequence. Memory...
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4687981 |
Stepping motor
A stepping motor having a rotary shaft carrying a rotor, a stator, a housing encasing the rotor and a part of the rotary shaft and supporting the stator, and a signal system comprising a signal...
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4684860 |
Electric motor drive equipped with a permanently magnetized rotor
The motor (9) comprises a motor winding with two phases (2, 3). Sensor c detects the orientation of the permanently magnetized rotor. Selector (S) controlled by line (s) which can be connected to a...
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4684866 |
Adaptive controller for a motor vehicle engine throttle operator
The phase winding energization frequency of a stepper motor throttle operator is adjusted in relation to a comparison between the actual neutral voltage crossing of back-EMF in the phase windings...
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4684865 |
Method and device for controlling the acceleration of an electric stepping motor
In order to attain the maximum permissible speed of a stepping motor and to achieve a substantial reduction in the time required to perform a predetermined number of steps, acceleration between the...
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4685007 |
Disk drive with track zero location system
A low cost disk drive system includes track zero information located in a single sector on the disk surface. The information is comprised of a first type of signal located in tracks to one side of...
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4684864 |
Driving circuit of stepping motor for floppy disk drive
A driving circuit of a stepping motor for a floppy disk drive which drives the stepping motor by feeding control signals supplied from a control circuit through drivers in order to feed a carriage,...
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4684262 |
Electronic timepiece with analog display comprising a seconds indicator member
The timepiece comprises a first motor for driving a second hand and a second motor for driving minute and hour hands. When the timepiece is operating normally, the first motor, which comprises at...
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4683410 |
Method for detecting step losses in stepping-motor-driven adjusting devices
In the method for detecting step losses in stepping-motor-driven actuating devices, a reference position of the actuating device is used for generating a sequence of drive pulses for the stepping...
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4683408 |
Stepping motor control apparatus
A stepping motor control apparatus comprises current computing means for computing a motor-coil exciting current corresponding to the holding position from a predetermined wave form pattern; micro...
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4683409 |
Stabilizing arrangement for a stepping motor
A pulse-width modulator is used to control the sequence generator of a stepping motor to stabilize the stepping motor. One input to the pulse-width modulator is a cyclic sequence of pulses. The...
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4683428 |
Method of and a device for identifying the position of the rotor of a stepping motor
The method according to the invention is applicable to motors comprising a magnetized rotor having two diametrically opposed poles, a stator making up a magnetic circuit having saturable...
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4682091 |
Telescope control system
A telescope control system is set forth for controlling the orientation of a telescope under control of a microprocessor. The telescope control includes drives to pivot the telescope about each of...
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4682092 |
Synchronous motor drive with chopper regulator
In the disclosed system, a switching circuit energized from a source applies current pulses to the windings of a motor, such as a stepping motor. A chopper regulates the winding currents during...
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4680514 |
Motor
The present invention relates to a motor for driving a clockwork. A rotatably supported rotor 1 has diametrically opposite permanent-magnet poles. A multi-phase coil arrangement is furthermore...
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4680524 |
Mechanism for positioning an output member
This invention relates to a mechanism for positioning an output member of a mechanical system and in particular a mechanical system that has backlash present. The mechanism has a step motor,...
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4680523 |
Apparatus and method for handling articles in automated assembly processes
An accurate high speed gripper assembly for use in handling articles in an automated manufacturing process. The gripper assembly includes a pair of movable fingers which depend from movable...
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4678979 |
Apparatus for controlling the carriage of a printer
An apparatus for controlling the carriage of a printer equipped with a stepping motor for reciprocating the carriage with a printing head comprising a power source circuit, a drive circuit for...
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4678978 |
Quieting circuits for permanent magnet synchronous motors
Quieting circuits for synchronous electric motors bypass their phase shifting coils with a minor percentage of the total motor watts input.
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4677359 |
Stepping motor drive method and system capable of stopping the rotor in a required angular position
A drive method and system are disclosed for a stepping motor typically having several sets of four phase windings on respective stator poles of annular arrangement, and a rotor having several...
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4677358 |
Stepping motor drive controlling circuit
A controlling circuit for a stepping motor provided on a disk recording and reproducing apparatus which circuit can prevent outputting of a zero track signal in error that may be caused by a...
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4675590 |
Stepping motor driver with mid-frequency stability control
In the disclosed stepping motor system a band pass filter extracts error signals from currents in a stepping motor driver, and a feedback system delays command pulses to the driver on the basis of...
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4673856 |
Stepping motor drive circuit
A stepping motor drive circuit includes a power source terminal and a reference potential terminal, a plurality of switching transistors, respectively connected between the reference potential...
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4673855 |
Restraining the instability of a stepper motor
In an apparatus and method for preventing instability of a stepper motor operated by a plurality of alternating currents of different respective phases and controlled by a sequence of control...
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