Did You Know...
...that Robert Adler has the dubious distinction of being the Father of the Couch Potato? Back in 1955 Adler was employed by what was then Zenith Radio Corp., where he was charged to invent something that would allow viewers to turn down the TV volume without leaving their chairs. After a series of flops (such as a wired contraption that people tripped over), Adler hit on the idea of using sound waves. Thus the Remote Control was born...
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| Number | Title | Issue Date |
| 8049446 | Motor control device and magnetic pole position estimation precision confirming method A motor control device includes a dq-axis current control unit for generating a dq-axis voltage reference based on a dq-axis current reference and a dq-axis current signal, an initial magnetic pole position estimation unit for estimating a magnetic pole position of ... | 11/01/2011 |
| 7973502 | Drive unit and manufacturing method thereof A drive unit includes a rotating electrical machine; a rotation sensor that detects a rotational position of a rotor of the rotating electrical machine, and a storage medium. In an inspecting step of measuring a counter electromotive force by mechanically driving th... | 07/05/2011 |
| 6917178 | Electric actuator system In determining a starting point of a motor of an electric actuator during its initialization procedure, when a rotation angle sensor detects pulse signals in a certain initialization pattern, power supply to the motor is stopped by the control of a motor drive circu... | 07/12/2005 |
| 6400113 | Apparatus and method for monitoring fan speeds within a computing system Apparatus for monitoring fan speeds within a computing system includes a tachometer turning with the fan, providing a tachometer signal including a number of pulses during each revolution of the fan. This tachometer signal is provided as an input to a sig... | 06/04/2002 |
| 6262549 | Fan speed pulse filter for a PWM fan A fan speed pulse filter is used for a PWM fan. The filter comprises a comparator, a latch circuit and a synchronizer. The fan unit, including a tachometer pulse output, is controlled by a PWM signal for determining the fan speed. By comparing the PWM sig... | 07/17/2001 |
| 6225770 | Method for the control of motor driven adjustment devices in motor vehicles High resolution and accuracy of the measured values for detection of the position, speed and/or acceleration of a drive is ensured. The tolerances are determined and considered in signal evaluation on a partitioned basis. Measurement errors caused by inac... | 05/01/2001 |
| 6060852 | Head rail-mounted actuator for window covering A mini-blind actuator has a motor and a housing that holds the motor and a dc battery. The rotor of the motor is coupled to the baton of the mini-blind for rotating the baton and thereby opening or closing the slats of the mini-blind. Alternatively, the r... | 05/09/2000 |
| 5654633 | Magneto-resistive tachometer sensor module with different resolution outputs for the same magnetic drum A tachometer for monitoring the rotation of an output shaft (e.g. of a motor, where the motor is enclosed within a standard NEMA housing), includes an enclosure (e.g. adapted to be secured to an end plate of the motor housing), the enclosure having a radi... | 08/05/1997 |
| 5369344 | Tachometer for determining the speed of a motor A motor control system accurately and reliably controls the speed of a motor so that the motor operates in accordance with a predetermined motor speed profile, and therefore does not exceed a predetermined safe speed, decelerates at a controlled rate, mai... | 11/29/1994 |
| 5349276 | Control system for regulating motor speed A motor control system accurately and reliably controls the speed of a motor so that the motor operates in accordance with a predetermined motor speed profile, and therefore does not exceed a predetermined safe speed, decelerates at a controlled rate, mai... | 09/20/1994 |
| 5225749 | System for controlling the rotational speed of a rotary member The present invention provides a system for controlling the rotational speed of a rotary member such as a video tape recorder drum or the like. The system detects a zero crossing interval in the output of a frequency generator, adding it to the subsequent... | 07/06/1993 |
| 4928045 | Circuit arrangement for generating a measurement signal associated with the frequency of an alternating current signal A circuit arrangement for generating a useful direct voltage signal associated with the frequency of an alternating current signal serves, in particular, to regulate the synchronism of an electric motor. It includes a comparator circuit (7) which converts... | 05/22/1990 |
| 4823060 | Circuit arrangement for generating a measurement signal associated with the frequency of an alternating current signal A circuit arrangement for generating a useful direct voltage signal associated with the frequency of an alternating current signal serves, in particular, to regulate the synchronism of an electric motor. It includes a comparator circuit (7) which converts... | 04/18/1989 |
| 4511830 | Servo control apparatus A frequency-voltage converting system has a first sampler for sampling the input signal at a predetermined time interval, a second sampler for sampling the input signal after elapse of a predetermined time period from said predetermined sampling time, and... | 04/16/1985 |
| 4455517 | Door activating control circuitry An improvement in door activating control apparatus including a short delay between the time the door is stopped during its closing direction of travel and starts moving in the opening direction when any one of any switch or button for opening the door is... | 06/19/1984 |
| 4218641 | Analog DC motor velocity control loop A pulse width modulated DC motor control system is designed to operate a DC motor at constant velocity. Feedback pulses generated at a rate proportional to the rotational velocity of the motor are converted to control pulses having a fixed on-time period ... | 08/19/1980 |
| 4191915 | Door operating apparatus A reversible motor operates a vertically movable door through transmission means including a friction clutch. Control means receiving the output of a tachometer generator driven by the driven member of the friction clutch are arranged to switch off the mo... | 03/04/1980 |
| 4105936 | Variable speed tape transport apparatus A variable speed tape transport apparatus for a tape cassette wherein the tape is driven at a selected one of plural predetermined speeds. The cassette includes speed indications thereon, each indication representing a respective normal tape speed. These ... | 08/08/1978 |
