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5032780 |
Programmable stepper motor controller
A motor controller provides a digital monostable circuit which generates a control signal indicating whether a field coil within a motor should be turned on or off. Two registers are provided...
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5028857 |
Method of controlling a bi-directional stepping motor and a bi-directional stepping motor adapted to be controlled by this method
A method for improving the efficiency of a stepping motor (1) comprising a rotor (15) having a permanent magnet (16) producing a first magnetic field, as well as a first coil (13) and a second coil...
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5017850 |
Mobile member control apparatus
A mobile member control apparatus is provided having a motor for moving a mobile member from a first position to a third position through a second position. The apparatus includes: a sensing device...
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5017851 |
Mechanical rotating combination lock opening device
A computer controlled electric motor with a driving shaft having a resilient cup type safe knob gripper fixedly attached to the distal end thereof for rotation therewith. A key pad for programing...
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5015938 |
Synchronizable drive system
The drive system connects a servomotor via a clutch to a shaft after the motor has started up from a standstill to a speed in synchronism with the supply frequency to the servomotor. The clutch may...
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5015937 |
Parametric current control for microstepping unipolar motor
A unipolar motor control system includes motor current regulation derived from monitoring battery voltage and motor temperature. The monitored battery voltage and motor temperature are inputs to a...
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5012172 |
Control system for switched reluctance motor operating as a power generator
A method for operating a multi-phase switched reluctance motor is a generator mode includes gating switches connected in series with selected ones of the phase windings of the motor into conduction...
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5012171 |
Control system for high speed switched reluctance motor
A method of controlling a switched reluctance motor during high speed operation in an operational range when the counter electromotive force exceeds the available DC source voltage and, therefore,...
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5010282 |
Method and apparatus for driving a DC motor
A high efficiency remote current sensing motor drive circuit is disclosed, wherein the use of a sense resistor to sense motor current is eliminated to improve the overall efficiency of the motor...
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5008607 |
Driving system for stepping motor
A driving system for a stepping motor wherein the stepping motor is rotated by a predetermined angle for each driving step. The system counts the time between two successive driving triggers, and...
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5006772 |
Position monitor for a stepper motor
A position monitor is provided for use in conjunction with a stepper motor wherein two imputs are provided to the monitor from the stepper motor phase windings. A first signal is provided which...
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5006773 |
Microcomputer control of stepper motor using reduced number of parts
A stepper motor control circuit having a reduced number of discrete components is provided by using an on-chip analog to digital converter of a single chip microcomputer to control the waveforms of...
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5003261 |
Rotation detection circuit having input pulse signals for a step motor
A rotation angle detection circuit for a step motor providing an up/down control signal for determining positive and negative rotation of the step motor and a mask control signal for determining...
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4999559 |
Control electromagnet
In a stationary electromagnet creating a multipole-nuclei dipole field for controlling the rotation around its axis of a movable element housing a permanent magnet, each of the electromagnet poles...
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4999558 |
Position control system
A position control system is disclosed for positioning a stepping motor to a target position according to a closed loop control system. The closed loop control system controls the position of the...
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4998052 |
Gearless direct drive switched reluctance motor for laundry application
A drive system for a laundry machine utilizing a switched reluctance motor of three or more phases and with stator/rotor pole ratios selected from the ratios of 6:4 and 8:6 with the actual number...
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4992717 |
Stepper motor drive circuit
A drive circuit excites a stepper motor. A current steering network alternately conducts current through first one and then the other of a set of AC windings. A regulated current source excites the...
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4988938 |
System for controlling the driving of a stepper motor
A system for controlling the driving of a stepper motor which is rotated by the driving pulses generated based on the two-phase excitation system for rotating a driven system is disclosed herein...
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4983902 |
Fast current discharging switch for a variable reluctance motor drive
A circuit (40) for controlling a variable reluctance motor in accordance with the invention includes a first switch (Q1) having first and second electrodes, the first electrode being connectable to...
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4983891 |
Motor driving apparatus with speed determined chopped drive and constant voltage drive control
A motor driving apparatus for driving a motor with a constant voltage by a driving pulse having a predetermined pulse width when the motor is rotated at a high speed, and for chop-driving the motor...
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4982146 |
Stepping motor driving device
A schedule driving device drives a polyphase stepping motor via a drive circuit that supplies phase currents to the motor for moving the read/write head of a disk storage device. Phase data...
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4975608 |
Switched reluctance motor with full accommutation
A reluctance motor is powered by a commutated ac voltage supply which comprises full cycles of the ac waveform interspersed with periods of zero power of fixed duration measured in full cycles....
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4972132 |
Stepping motor drive control circuit for a magnetic disk drive
A circuit for controllably and finely driving a stepping motor, which moves a magnetic head over a magnetic disk, by using the combination of current values which are individually approximated to a...
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4963809 |
Linear step motor type driving apparatus for driving a longitudinally movable body
A driving assembly for a horizontally-moving vertically-suspended body, for example a curtain, comprises a moving element disposed in a channel of a rail. The moving element is mounted with an...
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4963808 |
Motor control apparatus
A motor control apparatus disclosed in this invention counts output signals from an encoder upon rotation of a rotor, and performs energization switching of a motor coil when the count value has...
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4961037 |
Stepping motor control device
A current to be fed to a stepping motor for driving is determined by an operating circuit to which are input digital values converted from analog values representing various factors which may...
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4961038 |
Torque estimator for switched reluctance machines
Apparatus for estimating torque generated by a switched reluctance machine utilizes a ROM table look-up scheme to generate a torque estimate based upon phase current and rotor position information....
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4959738 |
Method and apparatus for driving a stepping motor
In driving a stepping motor which, for example, is used to effect tracking movements of a head in an electronic still camera or other magnetic disk recording and/or reproducing apparatus, and which...
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4959601 |
Driving device for a stepping motor
In a driving circuit for a stepping motor in which a phase current corresponding to a predetermined reference voltage is generated when an excitation signal for each phase of the stepping motor is...
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4956595 |
Driving circuit for a five-phase stepping motor
A driving circuit for a five-phase stepping motor includes five phase-windings each having a starting end and a terminating end in which each of the starting ends is successively connected to each...
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4952859 |
Stepping motor
A stepping motor characterized by the provision of an anisotropic resin magnet rotor which is the rotor of the motor and comprises an anisotropic resin magnet and which has recesses formed at the...
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4949027 |
Arrangement for and method of operating an electric step motor
An electric step motor has a sensor which functions to sense the position of the rotor. The sensor has an output which is connected to a first input of a unit for measuring lead angle. The...
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4947097 |
Automatic switching of motion control with tactile feedback
A rotary control knob is adapted to provide for automatic switching between two modes of movement control for a tape transport. An insulative ring surrounds a conductive knob, and the conductive...
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4933620 |
Control system for low speed switched reluctance motor
A method and apparatus for improving the operation of a switched reluctance motor at low speed incorporates an advance angle regulator which regulates the firing angle of current pulses to the...
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4933619 |
Stepping motor servo control system for a floppy disk drive
A stepping motor servo control system for a floppy disk drive, which can increase the track recording density and maintain the interchangeability among different recording media because it is not...
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4933621 |
Current chopping strategy for switched reluctance machines
A method and apparatus are provided for controlling the switching devices in a switched reluctance machine bridge inverter having at least two switching devices per phase. One switching device is...
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4930094 |
Vehicle serial bus, mechanical instrument cluster odometer therefor
A method and firmware/hardware system for updating an analog odometer using a pulse rate rather than an absolute number of updating pulse signals. The pulse rate is developed from a number that...
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4929879 |
Microstepping of an unipolar stepping motor
High resolution microstepping of an unipolar stepping motor 18 is accomplished by applying from a look-up table the values of the SINE and COSINE of a given angle to the control circuit of a...
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4928049 |
Circuit for controlling current switching in multiple inductive loads, with single current detector, particularly for windings of step motors
The circuit controls current switching in multiple inductive loads (L1, L2, L3, L4) fed by means of respective switching switches (SW1, SW2, SW3, SW4) and by means of respective current adjustment...
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4928050 |
Recorder
A data recorder in which a recording is moved by stepping motor whose rotor rotation angle is detected, the stepping motor having a current switching circuit which controls the application of...
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4926077 |
Resistance compensation in a motor using a thermally variable resistive network
A motor is disclosed comprising a housing and a plurality of parallel stator laminations mounted on the interior wall of the housing surrounding the rotor. The stator comprises a plurality of coils...
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4926270 |
Driving method for a stepping motor and sheet conveying apparatus using the driving method
This specification discloses a driving method for a stepping motor is provided with a time detecting step of detecting the time interval to between the generation of two a sheet conveyance...
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4924167 |
Rotor movement warning device for use in stepper motors
A rotor movement warning device for use in a stepper motor has a stator provided with a plurality of windings and a rotor rotatably provided in associated with said stator. The rotor movement...
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4918365 |
Electromechanical actuator having control and drive circuit
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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4914369 |
Disc drive with improved storage capacity
A drive system for a double-sided floppy disc includes a head for each side of the disc, a stepper motor responsive to stepper motor control signals for moving the heads to predetermined tracks on...
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4912692 |
High rate, bidirectional drive for a bipole stepping motor watch
An improved drive circuit for a quartz analog wristwatch having a bipole stepping motor with a drive coil, a power supply, a gear train having a plurality of gears driven by the rotor, a plurality...
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4912389 |
Rotary position detector for stepping motor
A sector is provided on a rotary shaft of a stepping motor. Two end edges of this sector define two reference positions. When a sensor detects one of the end edges, a reset signal generator...
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4910475 |
Pole grouping for stepping motor
Hybrid stepping motor apparatus that produces a step angle of 1/K p times the pitch angle Δθ p of the stator on rotor teeth, where K p is the number of phases for the motor, using a plurality...
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4908562 |
Method and apparatus for controlling the magnitude and direction of a current through a winding
The invention relates to a method and a controlling apparatus for controlling the magnitude and direction of a current (I) through a winding (L). The method and controlling apparatus are based on a...
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4906910 |
Drive circuit for a stepping motor control device
A pulse motor control apparatus for a polyphase excitation type pulse motor variably and independently controls excitation currents supplied to excitation coils. Ratios of any excitation current to...
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