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| Number | Title | Issue Date |
| 5731673 | Electrical power tool having a motor control circuit for increasing the effective torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck and has associated therewith a degree of looseness which must be taken up before torque from the motor is a... | 03/24/1998 |
| 5684662 | Driving apparatus for stabilizing operation of an extensible-retractable power antenna The driving apparatus for a power antenna, e.g. an extensible-retractable automotive radio antenna, is provided with stability function which controls the operation of the motor driving the power antenna until the power antenna is varied into a state for ... | 11/04/1997 |
| 5508595 | Method of controlling a windshield wiper system A method of automatically controlling the operating speed of a vehicular windshield wiping system based on an average rate of change in the value of a sensor signal indicative of the moisture on the windshield. The wiping system includes a motor for drivi... | 04/16/1996 |
| 5453670 | Method of controlling a windshield wiper system A method of automatically controlling the operating speed of a vehicular windshield wiping system based on an average rate of change in the value of a sensor signal indicative of the moisture on the windshield. The wiping system includes a motor for drivi... | 09/26/1995 |
| 5440215 | Electrical power tool having a motor control circuit for increasing the effective torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck and has associated therewith a degree of looseness which must be taken up before torque from the motor is a... | 08/08/1995 |
| 5364026 | Ventilation fan control The residential structure ventilating apparatus disclosed herein employs a variable speed exhaust fan. The speed is responsive to a sensor which detects air temperature at the exhaust port. The fan is energized when the sensed air temperature rises above ... | 11/15/1994 |
| 5276389 | Method of controlling a windshield wiper system A method for controlling a vehicular windshield wiping system, the wiping system being controlled in response to recognition of a particular rain pattern, and being capable of distinguishing between the presence of moisture and dirt on the windshield. The... | 01/04/1994 |
| 5276388 | Apparatus and method for controlling a windshield wiping system An apparatus and method for controlling a windshield wiping system, based on a connection threshold defined for starting operation of the windshield wiping system, a disconnection threshold defined for ceasing operation of the windshield wiping system in ... | 01/04/1994 |
| 4879754 | Speed controller The invention provides a speed controller which detects the period of an AC signal containing information of the rotational speed of a motor and controls the rotational speed based on the detected period value and a reference speed value. More particularl... | 11/07/1989 |
| 4829230 | Motor control circuit for accurate speed control with capacitor leakage compensation A slow start motor control circuit for applications wherein extremely accurate speed control is required, such as, in a centrifugal blood separator application is disclosed. In a blood separator, the degree of separation of cellular components, such as re... | 05/09/1989 |
| 4823056 | Pulse-width modulation drive circuit A pulse-width modulation drive circuit for a load such as a motor, particularly, a motor used in a compact disc player or the like, in which losses in diodes used to absorb reverse EMF are substantially eliminated. For this purpose, the pulse widths of pu... | 04/18/1989 |
| 4804895 | Charge balancing current sampler for a digital motor control An analog current sensing circuit is controlled by a current loop microprocessor. An integrator circuit stores charge which is the integral of armature current in a motor. The output is read by the microprocessor and divided by a time value to determine a... | 02/14/1989 |
| 4748389 | Motor speed control apparatus The motor speed control apparatus of the present invention includes a thyristor (14) connected in the current supply circuit of a motor (13) for phase controlling the motor to control its rotational speed. The determination of the trigger timing of the th... | 05/31/1988 |
| 4739230 | Control device for controlling motor speed without hunting A control device for use in maintaining a constant driving speed in various rotational objects such as a photosensitive drum, etc. for an electrophotographic reproduction apparatus, the control device being constructed with a driving device; a detecting d... | 04/19/1988 |
| 4736143 | Torque control apparatus for rotary machine A torque control apparatus for a compressor driven by a motor through a main shaft, in which variations of the rotation speed of the main shaft due to torque variations are detected at selected angular positions of rotation of the main shaft. Current valu... | 04/05/1988 |
| 4733146 | Energy recovery system for cyclic drives A system is disclosed for recovering and storing the energy generated by an electrical motor during deceleration so as to be available for use when the motor is subsequently accelerated. The system utilizes a capacitor for storing the energy produced by v... | 03/22/1988 |
| 4697126 | Control method for direct current motor A method of controlling a direct current motor operating in an essentially no torque, discontinuous current mode provides for delivering current pulses to the motor of alternate relative polarity so as to position the motor to rapidly respond to a command... | 09/29/1987 |
| 4680517 | Motor drive control device A motor drive control device to control the speed of a motor includes a drive control section in series with the motor. Only, when a speed setting voltage exceeds a first predetermined value the, drive control section conducts to energize the motor, and w... | 07/14/1987 |
| 4656401 | Load drive apparatus A system consisting of a motor that drives a load, an analog signal generator that outputs an analog signal which increases as the motor is accelerated, a speed commander that determines a motor speed and commands the motor to operate at the determined sp... | 04/07/1987 |
| 4581565 | H-bridge power amplifier and method for controlling the same An improved H-bridge power amplifier for controllably driving a dc motor is presented. The motor is connected in the center of the H-bridge in conventional manner. The H-bridge includes a current sense resistor placed between the power supply and a common... | 04/08/1986 |
| 4580082 | Method and devices for detecting whether a direct-current motor has slowed-down and a motor equipped with a device of this type The direct-current motor comprises at least one field winding supplied intermittently with direct-current voltage in order to produce a driving torque by interaction with permanent-magnetic poles which rotate with respect to the winding. The electromotive... | 04/01/1986 |
| 4575664 | Tachometer check apparatus An electronic motor control system is taught herein which utilizes a tachometer check circuit. The tachometer check circuit is an electrical circuit which is interconnected with the output terminals of the tachometer. The circuit is utilized when the tach... | 03/11/1986 |
| 4562549 | Digital player using a pulse width detector In a pulse width detector circuit, a high-level pulse width and a low-level pulse width of a digital signal derived by slicing an analog signal reproduced from a disc at a predetermined level are independently measured and maximum or minimum values thereo... | 12/31/1985 |
| 4549119 | Control system and method for operating mining machine traction motors and the like Method and apparatus for controlling DC traction motors on opposite sides of a vehicle, particularly a mining machine, by means of an SCR converter. The motors are accelerated while controlling the firing angles of the SCR's such that the current and volt... | 10/22/1985 |
| 4544852 | Circuit arrangement for monitoring speed of a drive motor A circuit for speed monitoring, particularly for fan drives. A detection device for producing an input signal sequence is provided which has a speed-dependent repetition frequency. The circuit also has a signal converter for converting the input signal se... | 10/01/1985 |
| 4525658 | Servomotor drive system Herein disclosed is a drive system for a servomotor for use with the carriage of a serial printer, comprising a source of a variable command signal representative of the speed at which the servomotor is to operate, detecting means for detecting the output... | 06/25/1985 |
| 4488096 | Speed control for a rotary machine A first capacitor is discharged with every pulse of a train of pulses of a frequency proportional to the actual speed of a rotary machine under control and is charged up during intervals between these pulses. The voltage of the first capacitor provides a ... | 12/11/1984 |
| 4454455 | Fault responsive means for changing control sequence of a multiple-bridge electric power converter In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by means of several phase-controlled rectifying bridges having serially connected outputs. The bridges are controlled sequentially... | 06/12/1984 |
| 4423498 | Control apparatus for a recording medium drive motor in a digital information reproducing apparatus A digital audio disc (DAD) reproducing apparatus comprises pulse width detection and pulse width-to-voltage conversion means for detecting a signal having a predetermined pulse width such as a maximum or minimum pulse width of code modulated digital data ... | 12/27/1983 |
| 4420713 | Turn-off control means for an ac-to-dc electric power converter In the propulsion system of an electric locomotive, a-c wayside power is converted to direct current for the traction motors by a plurality of phase-controlled rectifying circuits having serially connected outputs. To improve power factor, forced commutat... | 12/13/1983 |
| 4337424 | Speed control for a rotary machine A first capacitor is discharged with every pulse of a train of pulses of a frequency proportional to the actual speed of a rotary machine under control and is charged up during intervals between these pulses. The voltage of the first capacitor provides a ... | 06/29/1982 |
| 4309645 | DC Motor speed controller An electronic speed controller for a radio controlled model has conversion circuitry to derive a dc signal having a level that is proportional to the information pulse width of the radio control signal, but which is insensitive to changes in the frame rat... | 01/05/1982 |
| 4254368 | Apparatus for driving a motor In an apparatus for driving a motor wherein a carrier or stage carrying a sample thereon is located and moved to a predetermined position by controlling the slow-up and slow-down speed of the motor at the start and prior to the stopping thereof, respectiv... | 03/03/1981 |
| 4250437 | Field weakening circuits for electric motors A field weakening circuit for an electric motor comprises a switching circuit the impedance of which is variable connected in parallel with a field winding of the motor. The switching circuit impedance is variable in dependence upon motor speed and curren... | 02/10/1981 |
| 4233549 | Speed and torque control for fractional horsepower motors Power control circuitry for supplying pulses of power from a power source to a fractional horsepower motor with a plurality of power pulses applied to the motor during each half cycle of the power source waveform for more uniform speed and torque characte... | 11/11/1980 |
| 4162437 | Motor acceleration and starting torque control A three phase motor acceleration control fires SCR's to supply successively longer current pulses to the motor. The SCR's are controlled by comparing a chopped reference ramp and individual trigger ramps.... | 07/24/1979 |
| 4156257 | Motor control circuit for tape drive unit A tape drive for moving a tape with a prerecorded clock track past a transducer at a constant velocity. An output signal from a speed servo circuit controls the energization, and hence the speed, of a tape driving motor. It responds to a tape speed signal... | 05/22/1979 |
| 4105935 | Motor speed control apparatus A motor speed control apparatus has a frequency generator for generating a frequency signal the frequency of which is proportional to the motor speed; a first pulse generator for producing a first pulse train having the same period as that of the frequenc... | 08/08/1978 |
| 4096422 | Motor control system The duty cycle of the alternating current waveform applied to an electric motor is varied by varying the firing point of an SCR circuit. This firing point is varied by logic circuitry which responds to the largest (or smallest) output of several integrato... | 06/20/1978 |
| 4081728 | DC motor control circuit A DC motor control circuit is provided with a starter circuit responsive to the frequency of a rotational signal derived from a signal generator attached to the DC motor. The starter circuit includes a monostable multivibrator which ceases to operate when... | 03/28/1978 |
