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7272303 |
Method and control circuit for driving an electric motor of a seatbelt retractor
An electric motor drives a belt spool of a seatbelt retractor in a vehicle using a micro-controller and a drive circuit that drives the electric motor. A plurality of PWM control signal sources are...
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7248007 |
Control system to monitor the functioning of an electromechanical drive in a vehicle
A control system for an electromechanical drive in a vehicle has a motor ( 29 ) whose connections ( 24, 25 ) are connected to the assigned control elements ( 2, 3 ) of a bridge circuit, a control...
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7133603 |
Motor driving apparatus, digital camera, and motor controlling method
A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback...
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7046917 |
Speed controlling device of a motorized cart for a person to ride on
A device of a cart includes a control, a speed regulating potentiometer, a microprocessor, a digital-to-analogue converter, a motor controlling unit, and a switch; the control is angularly...
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6960894 |
Cordless, powered surgical tool
A powered tool for performing surgical procedures. The tool includes a handpiece in which a power generating unit is housed. A control member is mounted to the handpiece. The control member is...
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6934468 |
Brushless DC motor and circuit for controlling the same
Disclosed is a multiphase brushless DC motor of a concentrated winding type having shunt connection, and a control circuit. The brushless DC motor includes a rotor made up of a permanent magnet...
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6873124 |
Rotational speed controller for electrically powered tools
A rotational speed controller maintains a constant low speed during idling, a constant high speed when a load is applied and controls motor rotational speed in the range between low and high speed...
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6508636 |
Freon compressor
A freon compressor comprises a compressor device and an electromotor device. The electromotor device is used for driving the compressor device and consists of a stator and a rotor rotating within...
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6385395 |
Fan motor with its speed controlled by operating periods of a pulse wave
A fan motor whose speed is controlled by an operating period of pulse waves includes first and second rectifying circuits, a voltage comparison circuit, and a differential amplifier. A pulse wave...
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6316893 |
Method and arrangement for adaptive load change compensation
A method and arrangement for adaptively compensating for load changes, particularly in connection with an electric motor drive which comprises a motor, the shaft of the motor being connected to a...
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6313601 |
Speed control of a motor
A three-phase motor having three Hall-effect devices for production of as many rotor position signals for use in excitation control of its windings, the signals being indicative of the angular...
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5955853 |
Direct current motor for closed-loop feedback control
A direct current motor for use in a closed-loop control system is disclosed that produces a time varying signal indicative of a position of the motor. An embodiment of the motor includes a rotating...
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5859511 |
Motor with input-controlled high side driver
A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other...
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5672948 |
Digital, Back EMF, single coil sampling, sensorless commutator system for a D.C. motor
A digital, back EMF, single coil, sensorless up/down counter frequency adjustment system for a d.c. motor includes means for detecting the occurrence of a null voltage during the back EMF...
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5537012 |
DC motor control circuit and DC motor
A DC motor control circuit for controlling a restraint torque of a DC motor which continues the rotation by triggering an external force. This control circuit is installed in a DC motor. In a DC...
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5377296 |
Mine winder or hoist drum electric motor control for preventing excitation of oscillation
The invention provides a control system for an electric motor arranged to drive a rope drum of a mine winder or a hoist system which includes a conveyance supported by a rope and which forms an...
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5005207 |
Method of controlling the speed of a D.C. motor and device for carrying out the method
A device for controlling the speed of a d.c. motor (M) employs a method in which the motor supply voltage (V) is controlled by a control voltage (Vo) supplied by a comparator circuit (11) which...
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4905300 |
Motor control and power systems and methods of operation thereof
A pulsating D.C. voltage is developed by a rectifier 86 and is filtered by a capacitor 100 to facilitate application of a relatively smooth, enhanced D.C. voltage to a motor 106. The charged...
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4764711 |
Back emf loop closure
The back emf voltage of a motor is extracted from the applied motor voltage and motor current by means of a control system including a back emf sensor, an adaptive motor resistance circuit, and a...
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4721893 |
Process and apparatus for controlling the electric motor drive of a unit for the manufacture of moldings from multi-component plastics
To control the intermittent movement of a conveyor belt or carousel, fitted with molds, in a unit for the manufacture of moldings from multi-component plastics, an intended/actual value comparison...
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4707646 |
Method of limiting motor power output
The power output of a variable speed motor is limited to a safe level by determining the maximum allowable speed corresponding to a maximum power output limit over a range of load conditions and...
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4686439 |
Multiple speed pump electronic control system
An electronic control system for a multiple speed fluid pump and motor. A parameter of the motor, the pump, or the fluid which is expelled from the pump is measured by a sensor. When a...
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4677357 |
Furnace draft control with remote control feature
An apparatus for controlling the speed of a combustion blower motor includes first means for generating an output signal representative of a differential pressure. A second means provides a second...
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4675586 |
Monitoring circuit for a door operating D.C. electric motor
A monitoring circuit for a door operating D.C. electric motor, the circuit comprises a first means for detecting a back EMF of the motor and producing a load signal indicative of the magnitude of...
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4659976 |
Method and apparatus for maximizing utilization of an electric motor under load
The present invention relates to an electronic device that is used to calculate the actual torque being produced by an electric motor at any instant in time and comparing this value of torque...
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4649327 |
Electric motor control circuit
The motor control circuit is constituted by a current controlling circuit having a first output terminal connected to a source terminal via a resistor, a second output terminal connected to the...
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4644238 |
Airflow control apparatus
An apparatus for controlling an airflow to a boiler or the like and maintaining a desired quantity thereof. The apparatus comprises a controller for generating a control signal of a level...
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4639650 |
Control system for a cooling fan in an impact printer
A control system for an impact printer having a cooling fan, in which a current for driving a printing device is detected as a voltage and the detected voltage is compared with a reference value....
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4629954 |
Closed loop control method for hydraulic apparatus
A non-linear function f(A) of an effective value D' with respect to a desired value A regarding speed, pressure or the like of an actuator of a hydraulic apparatus in a closed loop control for the...
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4620140 |
Control device for variable speed electric motor
A control device for a variable speed electric motor determines a quantity of light received from a short-circuit current of a solar battery, and also determines a cell temperature of the solar...
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4567410 |
Capacitive article density monitor
A capacitance article density monitor which is adjusted to have a zero voltage output when no articles are positioned adjacent a sensor and wherein the output of the circuit may be utilized...
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4506199 |
Agricultural fan control system
Agricultural fan control system for controlling operation of fan in an agricultural installation including a thermostat temperature control, a manual constant speed adjustment temperature control,...
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4484116 |
Prime mover and method of operating an electrical switch
A prime mover adapted for selective energization across a power source. The prime mover has a winding circuit, a rotatable assembly, and an electrical switch including a housing, a first pair of...
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4426604 |
Direct current fan with control means
A network controlled inlet is provided for current sensing in a comparator to control the current in direct current motors. An electrical signal generated from a physical parameter is conducted to...
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4395668 |
Motors
A synchronous motor comprising a permanent-magnet rotor and a stator which, at startup, uses rectifiers for supplying the stator coil with rectified current and a commutator consisting of sliders...
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4390260 |
Play control for a threaded drive
The invention contemplates a precisely adjustable threaded mechanism, as for focus adjustment of an aerial camera lens, wherein inner and outer threaded members are normally in circumferentially...
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4371906 |
Overspeed protective apparatus for a portable tool
Disclosed is an overspeed protective apparatus for an electric motor having pairs of stator windings normally connected in parallel, the apparatus having an actuating mechanism responsive to an...
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4353017 |
Velocity compensation for limited displacement motors
A velocity-compensation circuit for a limited-displacement motor comprises a bridge circuit incorporating the control winding of the motor in a first arm. An adjacent bridge arm includes both an...
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4350937 |
Motor speed control device for DC motor
A motor speed control device for a small DC motor in which the speed of rotation of the motor is maintained stable during ambient temperature changes and changes in the load applied to the motor. A...
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4296366 |
Motor starting switch
A motor starting switch installable, for example, on a fractional horsepower electric motor and actuable between a run and a start position by means of a centrifugal actuator axially shiftable on...
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4291260 |
Motor velocity control servo amplifier
Motor velocity is controlled in accordance with the difference between a motor velocity command signal and an actual motor velocity signal related to the magnitude of motor back emf. Connected to...
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4278923 |
Apparatus for maintaining a rotating member at a constant speed
An assembly comprising a drive motor connected to a member to be rotated by a transmission means which is liable to slip when the rotating member is subjected to a loading thereon, includes a...
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4256998 |
Electrical control arrangement
An electrical control arrangement which includes firstly an electronic transducer, which is adapted to receive a controlled stream of fluid, and secondly control means to be controlled by the...
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4249118 |
Control system for multiple speed motor
A control system for a multiple speed motor includes a motor circuit having a plurality of resistance varying units in series with the field winding and armature of the motor and separate control...
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4227128 |
Speed responsive motor control circuit
A motor control circuit is provided for an appliance or the like of the type utilizing a speed adjustment device that controls an adjustable centrifugally controlled governor device. The governor...
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4218640 |
Tachometric measuring device for direct-current motors, and motor equipped with such a device
A stationary device for sensing the rotational speed of electric motors, comprising an impedance bridge circuit, the motor being inserted into one branch of the bridge in series with a resistive...
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4189666 |
Speed control system for small size D-C electric motor
A speed control system for a d-c electric motor comprising a three-terminal space control IC to provide a constant voltage source having a negative internal resistance equal in absolute value to...
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4139808 |
Control apparatus for electrically driven sewing machine
A sewing machine driven by a motor which is adapted to be energized by an alternate current power supply and is phase controlled by means of thyristors. In a normal operating mode the conduction...
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RE29775 |
Controlled rotor motor
An electric motor for driving a mechanical load at variable speed and constant torque includes a stationary housing containing a magnetic field rotor driven by alternating current and surrounding a...
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4103214 |
Error cancelling sync-off-tach tape drive system
A holographic recording is made on a tone wheel which is arranged to be driven by a capstan motor and capstan assembly. The holographic recording is a series of radial holograms on the tone wheel...
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