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4795953 |
Method of and electronic circuit for starting a reluctance motor and reluctance motor provided with such an electronic circuit
A reluctance motor comprises a stator (S) provided with coils (W1, W2), and a rotor (R). The rotor R has pairs of positions of stable equilibrium and pairs of positions of unstable equilibrium. The...
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4792816 |
Device for transporting photosensitive material past an imaging line in text and graphics image setting apparatus
Image setting apparatus is disclosed for producing two-dimensional images on photosensitive material. The apparatus includes a device for transporting the photosensitive material past an imaging...
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4791345 |
Driving device for a stepping motor
A driving device for controlling the driving frequency for a stepping motor includes a voltage control pulse generator for producing electrical pulses for driving the stepping motor. The pulse...
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4791343 |
Stepper motor shaft position sensor
A stepper motor shaft position sensor differentiates the current provided when the stepper motor is excited as by a step command voltage. The differentiated current is, in effect, a signature...
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4789909 |
Method and apparatus for placing servo information at predetermined locations on a disc
A method and apparatus for driving a two-phase motor having two phase coils and a head of a disc recording unit which records information data and servo information on a rotatively driven disc in a...
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4789816 |
Stepping motor drive control apparatus
A stepping motor drive control apparatus for controlling the drive of a stepping motor having a plurality of phase coils which are respectively excited to switch the phase. A cycle of a step signal...
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4788484 |
Method and apparatus for driving a stepper motor with multiple voltages
The invention is for an improved method and apparatus of driving a stepper motor with multiple voltages. A first voltage is applied to the step motor winding for a driving phase, and a second...
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4782276 |
Electric signal generator system and its application
The invention concerns an electrical signal generator system and its applications. According to the invention, the signal generator system includes at least one electric current generator of the...
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4782277 |
Method of driving and controlling a stepping motor
A method of driving and controlling a stepping motor having stationary field poles corresponding to N phases (N: an integer greater than or equal to 4) in which the stationary field poles are...
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4779033 |
Device for driving stepping motor
A stepping motor driving device of this invention includes: a first ROM for outputting an intermittent drive signal, a second ROM for outputting a continuous drive signal, a bus selector into which...
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4779031 |
Motor system
An electrical motor system is provided in which driver means position the motor, control the speed of the motor and control the current delivered to the windings of the motor. The operating...
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4779032 |
Drive device
A recording apparatus having a recording head for recording video signals on a magnetic disc as the disc rotates, comprises a servo motor, a circuit for generating a feedback signal representing...
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4777417 |
Head position control system for a disc storage unit
Lead wires are extended from phase coils of a head control motor, so that their effective reactances may be varied, and reactance selection circuits are additionally provided to switch values of...
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4777419 |
Control apparatus and method for operating a switched reluctance motor
A switched reluctance motor is cyclically energized to operate at a desired speed. The energizing current is sampled at a predetermined time after the beginning of the cycle, the energizing current...
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4775825 |
Positioning method and apparatus therefor
A method and apparatus for moving a moving member of a positioning mechanism to a target position by means of a stepper motor as a driver. The method and apparatus alleviate the positioning error...
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4775902 |
Apparatus for recording and reading information on a magnetic disk with track following circuitry
The apparatus records and reads binary information on a magnetic disk having magnetizable surfaces subdivided into a plurality of concentric tracks in which the information is recorded in block...
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4772840 |
Method and arrangement for controlling a stepping motor
The method of this invention includes measuring the quantity Eme of electrical energy converted into mechanical energy by the motor during a driving pulse, determining the time required for said...
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4772839 |
Rotor position estimator for switched reluctance motor
An indirect position estimator for a switched reluctance motor applies short duration, low level sensing pulses to two unenergized phases of the motor. A change in phase current during a sampling...
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4772841 |
Stepping motor and driving method thereof
A stepping motor includes a primary side magnetic flux generator unit having a plurality of magnetic poles and a secondary side magnetic member provided rotatably in the primary side magnetic flux...
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4769725 |
Servo head positioner using VCO and counter for digitizing position information
A servo control apparatus which can accurately control the head with a simplified structure has a voltage controlled oscillator which is controlled in accordance with servo information stored in a...
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4769585 |
Method of controlling a line-feed stepping motor in a printer and a driver circuit therefor
In a printer in which a printing medium is moved by a line-feed stepping motor during line-feed operation, and the line-feed stepping motor is stopped during printing operation and in a ready...
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4768115 |
Stepper motor magnetic hysteresis correction using a stepping algorithm
The magnetic hysteresis or magnetic memory error in a stepper motor is erased by sequencing the motor phases in a particular manner. In positioning a transducer by energizing selected phases of the...
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4764698 |
A.C. electric motors having a stator forming orthogonal magnetic paths
A stator of an A.C. electric motor includes a magnetic core comprising a magnetic ring member and two "U"-shaped magnetic members connected to the ring member. The two "U"-shaped magnetic members...
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4761590 |
Electric motor
An electric motor operating on the reluctance principle employs spaced rotor discs presenting rings of inwardly fcing poles of alternating polarity, typically by means of permanent magnets, and an...
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4761598 |
Torque-angle stabilized servo motor drive
A torque-angle stabilized servo motor drive which includes a constant current source and drive electronics responsive to step-control input signals for selectively applying current from the...
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4760320 |
Stepping-motor driving circuit
A stepping motor driving circuit of this invention is disclosed which includes a stepping motor having excitation coils M1 through M4. Respective excitation coils M1 through M4 are sequentially...
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4757245 |
Control system for a plurality of stepper motors
An apparatus and method for operating a plurality of stepper motors. A controller operates a plurality of sequentially connected stepper motors executing substantially the same motion. The...
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4757246 |
Step motor drive circuit
A drive circuit for a step motor having a multi-phase winding arrangement comprises means for generating a control signal which represents a fixed value during acceleration and deceleration periods...
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4757247 |
Single step stepping motor controller
A nonoscillatory single step operation of a stepping motor is obtained by using normal driving circuitry and voltage to start the stepping operation in the desired stepping direction and by...
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4755732 |
Microangle drive system for stepping motor and microangle drive circuit therefor
A microangle drive circuit for a stepping motor and the system therefor comprising output elements pairs of which are connected to one another in series, a sense resistance connected to the output...
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4751445 |
Stepping motor control device
A stepping motor control device is provided with a current control circuit by which the levels of currents of different driving power sources arranged to drive a stepping motor are virtually...
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4749930 |
High speed positive feed drill motor open loop control system
A high speed positive feed drill motor open loop control system. The motor system comprises a minimally limited inertia air turbine motor including mounting guidance and control for enabling the...
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4749931 |
Coil current control device
A coil current control device for e.g. a microstepping motor includes a coil (L), switching means (S), control means including a comparator (C) and a current measuring device (R). The coil can be...
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4746847 |
Control system for a stepping motor
A control system for a stepping motor comprises flowing an electric current to a plurality of phases in succession and driving the stepping motor, and flowing a loop current to a coil of the phase...
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4746849 |
Two lead bidirectional stepping motor control
A two wire control circuit for a bidirection variable speed stepping motor having motor drive logic adjacent to the motor. The control signals are momentary pulses which are superimposed on the...
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4743824 |
Method and apparatus for controlling a motor
The invention relates to a method and apparatus for controlling the current (I1, I2) through a stator winding (L1, L2) of a motor (M) which is supplied with energy from a voltage source (V) via a...
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4743848 |
Method of testing a stepping motor
A three-phase stepping motor is automatically tested for excessive friction and winding shorts in less than four seconds. The stepping motor accelerates its rotor at a constant rate to a first...
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4742287 |
Motor driving device for printer
A motor driving device in a printer wherein a selection signal for carrying out the driving selection of the respective stepping motors in outputted from a control circuit to the stepping motor for...
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4740737 |
Constant-current control circuit for a stepped motor of single-pole type, particularly for use in motor vehicles
A constant-current control circuit for a stepped motor of unipolar excitation. First and second switch devices are connected to phase and complementary phase inputs of the motor, respectively, and...
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4739240 |
Commutator for switched reluctance drive
A commutator for a microcomputer based switched reluctance drive employs a selectively addressable non-volatile memory, e.g. a ROM, to store stator phase firing patterns and facilities selective...
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4739346 |
Drive system and method for ink jet printer
For requirements where constant velocity is important and positional error must be small and non-cumulative, a bipolar or unipolar, two-phase, permanent magnet stepper motor is driven by sawtooth...
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4739239 |
Bipolar motor control
A disc drive system is disclosed including a data storage disc having a plurality of data storage tracks. Each track has a centerline, the centerlines of adjacent tracks being spaced by a fixed...
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4738209 |
Work material feeding device for sewing machine
A work material feeder for a sewing machine includes a work material holder which is movable within the plane perpendicular to a passageway where a needle is moved up and down, a first pulse motor...
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4737700 |
Method and circuit for driving a stepping motor
A method and circuit for driving a stepping motor which is driven by a motor clock output having a time variable frequency. So as to generate the time varying frequency, the constant frequency of a...
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4734847 |
Microstepping motor controller circuit
A controller circuit for controlling the movement of a stepper motor or the like about one or more axes is disclosed. The circuit includes a microprocessor and associated circuitry for generating...
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4734631 |
Step motor control
A step motor control system which can control a step motor to rotate at a variable high speed like a brushless motor. A position signal indicating a position of a rotor of a step motor relative to...
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4731570 |
Electrical drive circuit for a variable-speed switched reluctance motor
An electrical drive circuit for a variable-speed switched reluctance motor having a bifilar winding is provided. First, second, and third thyristor switches (5,7,10) each having respective firing...
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4727304 |
Phase sequencer for stepping motor
By examining parity for a bit combination representing the present phase state of a stepping motor, a selection can be made as to which phase state should be changed in order to produce rotation of...
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4724372 |
Speed control apparatus of hydraulic actuator
The driving speed of a hydraulic actuator is feedback controlled by adjusting an amount of fluid by a digital valve having a valve which is opened and closed by a pulse motor. For speed control,...
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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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