Matches 51 - 99 out of 99 < 1 2
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4152632 D.C. motor speed control apparatus having both armature current rate control and zero current deadtime optimized  
A speed control system is disclosed for a direct current motor drive energized by a thyristor armature supply. Voltage regulation for the thyristor supply is through a parallel current controller...
4151450 Protective means for feeder of machinery with DC-motor  
A protective means for a feeder of machinery having means for transmitting control signal formed from the differential between a predetermined revolution speed and an actual revolution speed of a...
4119897 Static convertor  
A static convertor with DC terminals for connection to a load object with a variable electromotive force includes a control arrangement for controlling the direct voltage of the convertor between...
4075865 Apparatus for controlling condenser pressure in a refrigeration system  
Constant condenser pressure is maintained in a refrigeration system by modulating the speed of at least one fan motor of an air-cooled condenser coil in response to the temperature of the...
4067276 Control device for a sewing machine  
The control device controls the sewing speed of a sewing needle automatically in a manner such that the temperature of the sewing needle, subjected to the influence of heat generated by friction...
4044287 Circuit for energizing the electromotor driving a blower  
A constant current source is provided for the energizing circuit of an electromotor driving a blower. The constant current source includes a battery connected in parallel with a series circuit...
4010411 Power conversion apparatus  
An improved motor control system in which cooperative interaction of a simplified programmed IR compensation structure and economical thermally compensated speed reference-error comparator...
4007605 Refrigeration system and control circuit  
In a refrigeration system having at least a condensor with a plurality of coils for passage therethrough of a refrigerant of the system and means for directing air flow in a selected path over the...
3965407 Method and means for measuring the torque delivered by an electric motor  
A torque feedback signal for the control system of a motor-generator set is generated by a torque feedback circuit which includes a differentiator and a current sensing circuit. The differentiator...
3937476 Reproducing apparatus for a disc type record medium  
A sound reproducing apparatus includes a device for producing an output signal proportional to the rotary angle of a rotary shaft which rotates in association with the pickup arm of a phonograph...
3935520 DC motor regulator  
A regulator for a direct current motor including both current limit and speed feedback paths further includes a speed control circuit for controlling a controllable power supply the output of which...
3912162 Furnace blower speed control  
A furnace blower speed control system adapted to vary the speed of a furnace blower with respect to time, the system including solid state means energizable to effect a delayed start of the blower...
3878446 Current regulator for D.C. motors  
Disclosed is a circuit for regulating a d.c. motor that makes use of the inductive reactance of the motor and utilizes a switching regulator to regulate the current to the motor. This system has...
3873901 Automatic torque control system for motors  
Disclosed is circuit means for controlling the torque of the servo motor with respect to the speed of the servo motor. This system finds particular application in document feed apparatus where it...
3843913 SPEED REGULATING ARRANGEMENT FOR DC MOTORS  
An arrangement for maintaining constant the speed of DC motors. The motor is mechanically coupled to a generator the electrical output of which is added to a reference voltage. A power transistor...
3795850 REGENERATIVE MOTOR CONTROL SYSTEM  
Motor control system in which regenerative bridge is conditioned to be conductive when the gating angle for SCR's in the bridge for operating in a motoring direction is such that the SCR's will not...
3775653 PROPORTIONAL INTEGRATOR SQUARED (PI) 2 SPEED CONTROLLER FOR UTILIZATION IN A SPEED REGULATOR SYSTEM  
A speed controller for utilization in a speed regulator system for a d.c. motor. An operational amplifier receives a voltage V 1 through a first resistor R 1 , the voltage V 1 being a function of...
3728604 MOTOR CONTROL SYSTEM  
Motor control system in which the electromotive force generated by the motor and motor armature current is sensed on starting and stopping to inhibit operation of the motor contactor for making and...
3716771 DC MOTOR SPEED CONTROL WITH MOTOR VOLTAGE AND CURRENT SENSING MEANS  
This disclosure is directed to a feedback control for a D.C. shunt motor for motoring and regenerating modes of operation. The motor armature is connected to a three-phase A.C. input by a pair of...
3716772 TAPERED CURRENT LIMIT PROTECTION FOR D. C. MOTOR  
A tapered current limit control for a thyristor-powered direct current shunt motor lowers the current limit level in speed ranges wherein the current carrying ability of the motor is reduced. A...
3710220 MOTOR SPEED REGULATION  
A variable direct voltage obtained from a motor-driven tachometer generator is connected in series with a voltage divider across a fixed direct reference voltage to provide a feedback voltage as a...
3707660 ARRANGEMENT FOR REGULATING THE CURRENT SUPPLIED TO THE OPERATIVE CIRCUIT OF A COMMUTATING MOTOR  
A control system for a commutating electric motor includes at least one semiconductor controlled element for controlling the current in the operative circuit of the motor and a control device for...
3678360 MOTOR SPEED CONTROL WITH TRANSFORMER FEEDBACK MEANS  
A power supply circuit including a Triac for controlling the initiation of current flow to the load during each half-cycle. Firing of the Triac is directly controlled by a diac, and during each...
3671835 MOTOR SPEED CONTROL WITH DROOP COMPENSATION  
Compensating for droop in load-speed characteristic of a DC motor, an armature current signal, which is indicative of motor load, is amplified to control armature voltage. A negative feedback...
3617844 CONTROLLED-VELOCITY DRIVE  
A DC controlled-velocity drive. An SCR power bridge is energized by a three-phase AC power source for supplying DC voltage to the armature of a DC drive motor when the SCR's are triggered, shifting...
3600650 PROTECTED SEMICONDUCTOR DEVICE HAVING SENSOR THERMALLY COUPLED TO ELECTRODE  
A semiconductor device has a sensor of thermistor material in thermally conductive contact with an electrode of the device at a surface common to the electrode and the sensor for intimate thermal...
3599063 SPEED CONTROL SYSTEM FOR D.C. MOTOR  
A control system is composed of a saturation amplifier delivering a positive or negative saturated voltage depending on the sign of a difference voltage between a command voltage and a negatively...
3584282 CURRENT LIMITING SYSTEM FOR MOTOR CONTROL  
A system is disclosed for limiting the current to a motor operative with the controlled power supply including controlled rectifier devices for converting an AC input to a DC output wherein a...
3543118 DYNAMOELECTRIC MACHINE CONTROL CIRCUIT INCLUDING VARIABLE RESPONSE NETWORK  
3543113 LOAD WEIGHT CIRCUIT FOR TRACTION MOTOR CONTROL SYSTEMS  
3538412 MOTOR CONTROL SYSTEM WITH THREE PHASE CONVERSION  
3519913 AC TO DC CONVERTER CIRCUIT  
3518519 RIPPLE ELIMINATING ARMATURE FEEDBACK D-C MOTOR SPEED CONTROL CIRCUIT  
3461371 MANUALLY OPERATED MOTOR SPEED CONTROL SYSTEMS WITH AUTOMATIC POWER ASSIST BY SEMICONDUCTOR CONTROLLED RECTIFIERS  
3438264 PARTICLE CLASSIFIER  
3422331 MOTOR SPEED CONTROL SYSTEMS  
3410164 Automatic movement control system for a work device for a workpiece  
3334286 Control circuit having excessive power load protection means  
3295040 Current limit circuit  
3292068 Saturable reactor motor speed control circuit  
3284688 D.-c. current regulator including a high gain saturating amplifier  
3252069 Speed control systems for electric motors  
3214666 Motor speed controller  
3163812 Motor speed and acceleration control systems  
3134065 Positive-feedback d. c. motor speed control circuits  
3122009 Laundry machine  
3086156 Apparatus for controlling a powerrectifier system  
2809338 Constant horsepower motor control and indicating circuits  
3555388 Title is not available  
Matches 51 - 99 out of 99 < 1 2