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3803472 |
CONTROLLED VARIABLE TIME RATIO CONTROL CIRCUIT
An oscillator circuit having a variable mark-space ratio is provided through the selective variation of both the pulse width and the interpulse spacing. This oscillator circuit is particularly...
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3781620 |
FULL WAVE GOVERNOR CONTROL SYSTEM
A full wave governor control system for a DC motor which regulates the motor speed in response to an error control signal derived by sensing the emf of the motor and comparing it to a reference...
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3780366 |
ELECTRIC CONTROL APPARATUS
A motor control circuit especially suitable for low inertia motors in which the motor is energised by a succession of full power half wave pulses. For speed control the pulses are applied to the...
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3761789 |
TOOL CARRIER AND SPEED CONTROL THEREFOR
A tool carrier having a rotary portion and a control circuit operative to control the same at a selected speed, the control circuit having an output voltage which is a function of the speed of the...
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3743907 |
SPEED CONTROL OF ELECTRICAL MOTORS
Circuit arrangements for applying an increasing voltage to a motor with increasing motor speed in a lower speed range and for applying a decreasing voltage to a motor with increasing motor speed in...
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3737748 |
MOTOR SPEED CONTROL CIRCUIT WITH UNIJUNCTION TRANSISTOR LINE VOLTAGE COMPENSATION
An adjustable speed control circuit for a DC motor which automatically compensates for variations in both motor load and the voltage level of an AC source which supplies power for driving the...
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3735220 |
CONTROL CIRCUIT FOR A D.C. MOTOR
The field and armature currents are for the shunt-wound vehicle motor and are controlled in dependence on signals representing the actual and desired operating states of the motor. A...
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3719876 |
MOTOR SPEED CONTROL SYSTEM USING CONTROLLED RECTIFIERS
A DC motor control system which includes a first controlled rectifier connected in series between a DC voltage source and a DC motor. A second controlled rectifier is connected across the first...
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3691440 |
OVERSPEED DETECTOR
A shaft overspeed detector has a shaft-mounted strip which periodically interrupts a light beam falling on a photosensitive cell as the shaft rotates. An electrical circuit provides a time-based...
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3675104 |
SINGLE-PHASE FULL-WAVE REGENERATIVE SCR SHUNT MOTOR CONTROL SYSTEM
A single-phase full-wave regenerative SCR (silicon controlled rectifier) drive having a series and shunt, T-network, reactor configuration, minimum firing of both forward and regenerative SCR's,...
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3668560 |
PULSE-WIDTH FREQUENCY MODULATION DEVICE
As described herein, a train of pulses used to control a servo-motor is modulated in accordance with the values of a varying digital input signal. To obtain accuracy of control, the digital input...
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3667021 |
SERIES MOTOR CONTROL CIRCUIT USING THYRISTORS ENERGIZED BY DIRECT CURRENT
A commutation control circuit for a motor including a power thyristor and an auxiliary thyristor for switching the power thyristor under control of a variable frequency pulse generator making use...
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3623138 |
LINEAR DC VOLTAGE TO FIRING ANGLE CONVERTER CIRCUIT
A triggering circuit for a controlled rectification system is provided which supplies firing pulses to the rectifiers at some phase angle determined by an input DC error signal. The firing circuit...
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3622853 |
CONTROL CIRCUITS FOR CLOTHES WASHING AND SPIN-DRYING MACHINES
A control circuit for clothes washing and spin-drying machines incorporating a pulse-producing circuit for generating a series of electric current pulses arranged to be applied to the gate of a...
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3621353 |
PHASE LOCK, SPEED CONTROL SYSTEM
A system for controlling the speed of either a capstan or a head drum motor in a videotape recorder to phase lock the motor to a reference signal. The position of the capstan or drum motor is...
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3614569 |
DC MOTOR CONTROLLERS WITH IR COMPENSATION FOR EXTENDED SPEED RANGE
In a standard speed control circuit for DC electric motors, such circuit generally being comprised of an external speed command potentiometer electrically connected to an amplifier, a negative...
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3604996 |
CONTROLLED POWER SUPPLY SYSTEM
Controlled power supply system for connection to an AC source and having two oppositely connected silicon controlled rectifiers (SCRs) for conducting current in opposite directions to an electrical...
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3601673 |
MOTOR CONTROL CIRCUIT
Alternating current rectified by a bridge rectifier is supplied through an SCR device to a motor armature; the bridge rectifier, SCR device, and armature being connected in a series loop circuit. A...
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3593087 |
MOTOR CONTROL SYSTEM WITH DOUBLE IR COMPENSATION
A DC motor control system is energized by semiconductor switches controlled by firing circuits. A control amplifier is connected to regulate the firing circuits and to energize the motor as a...
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3593088 |
MOTOR CONTROL SYSTEM WITH CONTROL AMPLIFIER STAGE HAVING ANTIUNDERSHOOT CIRCUIT
A DC motor control system is energized by semiconductor switches controlled by firing circuits to regulate the conduction times of the switches. A control amplifier stage provides a signal to...
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3581175 |
SPEED CONTROL CIRCUIT WITH TWO VOLTAGE SOURCES TO ENABLE PRECISE SPEED CONTROL OVER A LARGE SPEED RANGE
There is disclosed a control system for controlling the speed of the direct current electric motor over a wide range of speeds, for example, a speed range ratio of 1600:1. The speed of the motor is...
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3571689 |
CIRCUIT FOR SUPPLYING CONTROLLED DC LOADS FROM POLYPHASE AC SOURCES
A unique control circuit for supplying DC loads from polyphase alternating current sources incorporates rectifying switching means in a transformer output which are connected in series with a DC...
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3569809 |
DC ELECTRIC MOTOR CONTROL SYSTEMS
A variable-speed direct current shunt motor control system having an increased torque at its upper speed range, in which motor speed is controlled by controlling voltage applied to the motor...
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3569810 |
PULSE WIDTH MODULATOR WITH PULSE WIDTH LIMITING
A power control circuit for a battery-operated DC traction motor having an inverter providing a series of reference pulses defining periods therebetween, a pulse width modulator receiving said...
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3555304 |
FIRING UNIT FOR CONTROLLED RECITIFIERS
A firing unit for a controlled rectifier produces a firing pulse in response to equality of a DC error voltage and a voltage which is the integral of the rectifier input waveform; the integrated...
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3551772 |
CLOSED CONTROL SYSTEM HAVING MEANS RESPONSIVE TO THE AMPLITUDE OF SELFOSCILLATIONS TO MODIFY ONE OR MORE PARAMETERS OF THE SYSTEM
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3549972 |
SPEED CONTROL CIRCUIT FOR A DC MOTOR
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3546554 |
PHASE DEPENDENT MOTOR SPEED CONTROL
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3543119 |
CONDITION SENSITIVE SPEED CONTROL FOR ELECTRIC MOTORS UTILIZING A HYSTERESIS CAPACITOR AND A NETWORK FOR PREVENTING FALSE TRIGGERING
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3541416 |
MOTOR CONTROL SYSTEM WITH BEMF SAMPLING ONLY WHEN ARMATURE IS COASTING
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3539893 |
HYBRID MOTOR CONTROL CIRCUIT FOR PROVIDING IMPROVED SPEED REGULATION
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3538404 |
TORQUE REGULATING PULSE MODE D.C. MOTOR CONTROL USING THE MOTOR IN THE REGENERATING OR MOTORING MODES
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3538406 |
BATTERY-POWERED RECORDER
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3536971 |
INHERENT CURRENT LIMIT CIRCUIT
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3535610 |
DUAL PULSE GATING OF A FULL WAVE OF A CONTROLLED RECTIFIER SYSTEM
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3530352 |
CIRCUIT FOR REGULATING THE SHAFT SPEED OF A COMMUTATOR-TYPE MOTOR
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3523234 |
SOLID STATE SWITCH CONTROLLER FOR UNIVERSAL OR D.C. MOTORS INCLUDING A UNIQUE TRIGGER AND REGULATOR THEREFOR
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3517290 |
THYRISTOR CONTROL CIRCUIT WITH FULL LOAD CURRENT BY-PASS,PARTICULARLY FOR ELECTRICAL VEHICLES
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3515971 |
MOTOR CONTROL SYSTEM WITH FEEDBACK AND VARIABLE GAIN AMPLIFIER RESPONSIVE TO CURRENT
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3514685 |
OPTICAL SPEED TRANSDUCER
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3510743 |
LOAD SENSING AND COMPENSATING CONTROL CIRCUITS
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3500161 |
CONTROL ARRANGEMENT FOR ELECTRIC MOTORS HAVING A POWER CIRCUIT INCLUDING A THYRISTOR
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3495154 |
PHASE CONTROL CIRCUIT FOR MOTORS OR THE LIKE
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3465229 |
METHOD OF CONTROLLING A DIRECT CURRENT MOTOR
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3445739 |
VARIABLE SPEED CONTROL FOR POSITION REGULATOR MOTORS
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3443189 |
MOTOR CONTROL AND OVERLOAD PROTECTION
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3441827 |
CONTROL SYSTEMS FOR DIRECT CURRENT ELECTRIC MOTORS
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3441826 |
TACHOMETER FEEDBACK CIRCUIT FOR D.C. MOTOR SPEED CONTROL
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3436635 |
PULSE WIDTH MODULATED SERVO DRIVE CONTROL SYSTEM
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3435329 |
SCR TYPE ALTERNATING CURRENT ELECTRIC POWER CONTROL
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