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| Number | Title | Issue Date |
| 6956342 | Driving circuit for a DC brushless fan motor The present invention is a driving circuit for a DC brushless fan motor, comprising a control unit, a motor, a Hall element, a signal output unit, a temperature control circuit, a reverse protection circuit and a counter-electromotive force (CEMF) removal circuit, a... | 10/18/2005 |
| 6870337 | Methods and apparatus for maintaining synchronization of a polyphase motor during power interruptions Methods and apparatus permit: monitoring a level of a power source that provides operating power to a control circuit, the control circuit being of a type that senses signals in windings of a polyphase motor to maintain synchronization therewith; and converting kine... | 03/22/2005 |
| 6859000 | Device for position determination in sensorless motors A device for position determination in a sensorless direct current motor has a plurality of inductivities arranged in corresponding phases and inducing alternating voltages in a motor windings, a plurality of resistances located in phase branches to be evaluated for... | 02/22/2005 |
| 6762578 | Motor controller for a motor with feedback potentiometer The invention concerns a motor controller for a motor with a feedback potentiometer, preferably for central air valve actuation. In the field of climate control, for example for utility vehicles and motor vehicles, the air ducts in heating, air conditioning and/or v... | 07/13/2004 |
| 6741049 | Low voltage start up circuit for brushless DC motors A local oscillator and logic circuit pulses the open winding of a brushless DC motor at start up and the back EMF is used to generate a voltage to boost the voltage available to the control circuit for optimizing performance when starting with low supply voltage. As... | 05/25/2004 |
| 6724162 | Motor-control device enabling the rotational speed of the motor's rotor to be measured A device for controlling a motor intended to set an arm provided with a head for reading/writing information in motion with respect to a surface carrying information. The device having a controller for enabling the power supply of the winding of the motor to be mana... | 04/20/2004 |
| 6580236 | Brushless motor drive circuit having low noise and high efficiency A motor drive circuit for driving a brushless motor having a rotor and exciting coils of respective phases. A square wave rotor position signal for each phase is produced wherein a half period of the rotor position signal corresponds to a time period from... | 06/17/2003 |
| 6181410 | Oscillating motor, measurement device for measuring distance, speed or direction using a laser light, and vehicle having the measurement device A measurement device has a laser light source for irradiating a laser light, a reflecting mirror for reflecting the laser light irradiated from the laser light source in a preselected direction and/or for scanning the laser light within a preselected angl... | 01/30/2001 |
| 5399950 | Automatic venting system for a vehicle with obstruction detection utilizing dynamically modified thresholds A motor control system for controlling operation of an electric motor associated with a motor-operated vent in a vehicle. The system monitors and stores data relating to the operating current and detects occurrences of abnormal loads applied to the vent b... | 03/21/1995 |
| 4855654 | Rotary body drive device A rotary body drive device for controlling rotation of a motor on the basis of the phase difference between a periodic signal produced in accompaniment with rotation of the motor and a reference clock signal so that their phase relationship becomes a pres... | 08/08/1989 |
| 4818923 | Method of, and apparatus for, regulating the rotational speed of an electric motor in a four quadrant mode of operation An inexpensive and reliable regulating apparatus contains between a regulating unit and an electric motor series-connected therewith a feedback path for a single tachometer signal and including a band-pass filter. The band-pass filter determines the opera... | 04/04/1989 |
| 4789040 | Motor-driven power steering system for a vehicle A motor-driven power steering system for a vehicle capable of preventing a motor-related element such as a motor itself, power elements for controlling power supply to the motor or the like from being damage due to an abnormal temperature rise or overheat... | 12/06/1988 |
| 4772833 | Feedback control system for producing pulse width modulation control signal In a feedback control system for providing a pulse width modulated control signal for feedback controlling a motor or other device in accordance with control error data, control data produced according to the control error data and previously stored round... | 09/20/1988 |
| 4521894 | Overspeed/underspeed detector A digital system for monitoring the rotational speed of a rotating body, such as a turbine shaft, in order to indicate an overspeed or underspeed condition, features a readily variable reference speed limit. A reference pulse train is generated. The numbe... | 06/04/1985 |
| 4270868 | Digital pulse-width modulated printer escapement control system Disclosed is a digital escapement control system in which the motor (DC) control is completely digital requiring no tachometer generation of feed back signal nor any analog to digital convertors. Connected to the DC motor shaft is a code wheel and detecto... | 06/02/1981 |
| 4049999 | Speed control system for a chairlift A speed control system for a chairlift which reproduces automatically at the arrival of a seat in the disembarking station the speed which this seat had in the embarking station. The speed information is applied to a shift-register or a magnetic recorder ... | 09/20/1977 |
