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| Number | Title | Issue Date |
| 7421193 | Digital motor control system and method A digital motor control system utilizes time duration electric pulses generated by digital logic to control the motor speed and direction of rotation of a D.C. or A.C. motor. The digital logic produces width modulated pulses that can be connected to large or small e... | 09/02/2008 |
| 7350435 | Motor, especially a gear motor or a selector motor of a transmission actuating system, and method for detecting the moving direction of a motor The invention relates to a method for determining the moving direction of a motor, especially an electric motor of a transmission actuating system for gear selection and/or shifting, whereby at least one signal of the motor is detected. The inventive method is chara... | 04/01/2008 |
| 7298103 | Control and motor arrangement for use in model train A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arragement further includes a command control interface configured to receive co... | 11/20/2007 |
| 7298967 | Electromagnetic sensor direct communication algorithm to a digital microprocessor A method of interfacing an electromagnetic sensor with a controller in a motor control system, the method including: applying an excitation signal to the electromagnetic sensor; receiving a first electromagnetic sensor output signal based on the excitation signal, t... | 11/20/2007 |
| 7249272 | Apparatus and method for coordinating activities of one or more computers A method and apparatus for coordinating the activities of multiple computers using a common reference point such as a Global Positioning System pulse-per-second signal. A reload register transmits a reload value to a mission timer. The mission timer generates an int... | 07/24/2007 |
| 7187142 | Motor drive with velocity noise filter A drive unit for controlling a motor includes a position feedback device and a velocity noise filter. The position feedback device is operable to generate a position signal relating to a position of the motor. The velocity noise filter is coupled to the position fee... | 03/06/2007 |
| 7184654 | Semiconductor device control apparatus and method In a control apparatus for a motor, which rotates a fan, a semiconductor device is connected to the motor in series to drive the motor. An analog driver circuit drives the semiconductor device with an analog voltage. A PWM control circuit drives the semiconductor de... | 02/27/2007 |
| 7141945 | Method and apparatus for controlling motor drive In the invention, a PWM signal is formed at a frequency of a reference pulse signal, the PWM signal which has a pulse width being changed according to a frequency difference between an FG pulse signal for detecting a speed of a brushless motor and the reference puls... | 11/28/2006 |
| 7109670 | Motor drive with velocity-second compensation An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 7084894 | Optical disc drive focusing apparatus An optical focusing system is configured to generate a data profile, wherein the data profile is configured to provide signals for operation of an actuator. Application of the signals from the data profile results in focus of optics within a label region of an optic... | 08/01/2006 |
| 7064940 | Over heat protection circuit for a brushless dc motor A over heat protection circuit for a brushless dc motor includes a thermal sensitive resistor, a resistor and a transistor. The thermal sensitive resistor and the resistor are commonly connected to a base of the transistor while an emitter of the transistor connecti... | 06/20/2006 |
| 6995538 | Rotational direction detecting apparatus for a three-phase brushless DC motor A region judging circuit judges an electric angle region of a three-phase brushless DC motor based on an output signal of a resolver. A latch timing output circuit determines an optimum latch timing. A driving direction judging circuit judges a rotational direction ... | 02/07/2006 |
| 6996333 | Fan speed control A fan speed control includes a power adapter, a CPU programmed with a phase splitting program, a current-limit resistor, a capacitor, a TRIAC, and a switch module, the CPU having a signal input terminal connected in series to the power input terminals of the power a... | 02/07/2006 |
| 6975977 | Low-complexity, high accuracy model of a CPU anti-resonance system A low-complexity, high accuracy model of a CPU anti-resonance system has been developed. The model includes a simulated load model, a simulated transistor that simulates the performance of a high frequency capacitor, and a simulated capacitor that simulates the perf... | 12/13/2005 |
| 6972534 | Delay compensation for stable current regulation when using variable-delay random PWM switching A control system for an electric machine having a rotor position sensor that generates a rotor position signal, a velocity module that generates an electric angular velocity value based on the rotor position signal, a random pulse width modulation module that genera... | 12/06/2005 |
| 6943509 | Rotor speed control device and method Kinetic energy of a rotor is substantially prevented from exceeding a predetermined amount of kinetic energy by determining a first kinetic energy of the rotor spinning at a first rotational velocity and determining whether the first kinetic energy exceeds the prede... | 09/13/2005 |
| 6936990 | Method for controlling electric motor and apparatus for controlling the same An apparatus and method for controlling an electric motor is disclosed. The apparatus includes an instruction inputting section for transmitting an instruction for an electric motor or a control object coupled to said electric motor and a prefilter section for outpu... | 08/30/2005 |
| 6915376 | Host controlled optimization of disk storage devices A method, apparatus and computer program for causing a host computer to optimize execution of plural requests for access to plural data storage locations on a rotating disk, included in a disk storage device, based on a rotational position of the disk relative to a ... | 07/05/2005 |
| 6823133 | Apparatus and method for electronic control of DC motor using an all-digital phase-locked loop A control system in the form of an all-digital phase-locked loop controls movement of a DC motor. The control system includes a movement detector in the form of an optical encoder to detect movement of a DC motor. A digital phase detector compares output of a feedba... | 11/23/2004 |
| 6717384 | Frequency changer protection circuit for controlling the acceleration of an electric vehicle A frequency regulator protection circuit for controlling acceleration of electric vehicle comprises a power unit, a display unit, a protection unit, a control unit, a sensor unit, a data processor unit, a trigger unit, a regulator unit, and an output unit. The contr... | 04/06/2004 |
| 6559616 | Rotational pulse generating circuit for motors A motor rotational pulse generating circuit for a motor is provided which generates a correct pulse signal even at an initial turning-on stage of the motor, by adjusting a filter cutoff frequency in response to motor rotational condition. The motor rotati... | 05/06/2003 |
| 6456028 | Pulse generating circuit for driving DC motor A pulse generating circuit for motor rotation of a direct current motor which is capable of pulse generation following the variation of the motor rotation condition and of stable ripple pulse generation. The pulse generating circuit for motor rotation inc... | 09/24/2002 |
| 6314342 | Method and system for optimizing operation of vehicle control systems based on the dynamics of the vehicle A method and system for optimizing performance of vehicle control systems based on the dynamics of the specific vehicle include a sensor for sensing a predetermined parameter associated with any one of the vehicle control systems during a predetermined tr... | 11/06/2001 |
| 6259224 | Electronic cancellation of DC motor noise An active attenuation system for a DC motor which yields global vibration reduction of slot or other motor induced tonals at the plate on which the motor is mounted without modifying the construction of the motor. The system comprises one or more vibratio... | 07/10/2001 |
| 6240246 | Anti-resonance mixing filter In a closed loop control system that governs the movement of an actuator a filter is provided that attenuates the oscillations generated by the actuator when the actuator is at a resonant frequency. The filter is preferably coded into the control system a... | 05/29/2001 |
| 6031966 | Motor speed control device The motor speed control device of the present invention is provided with an FG sensor and a waveform shaping circuit for obtaining N pulse signals (Nࣙ1 where N is an integer) in one rotation of a motor so as to control the rotation speed of the motor in... | 02/29/2000 |
| 5929586 | Vehicular motor driving apparatus A vehicular motor driving apparatus includes a control unit 15 for drive-controlling a motor by PWM-drive-controlling a motor driving circuit based on a motor starting signal. The control unit has a drive controller for setting a drive frequency of a PWM-... | 07/27/1999 |
| 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 noise, while maintaining an acceptable charge rate. The gate of... | 01/12/1999 |
| 5808431 | Motor rotational speed control apparatus A motor rotational speed control apparatus is constructed by a control unit for performing an instruction to accelerate a rotational speed of a motor, an instruction to decelerate, or an instruction to maintain a rotational speed, a driving unit for drivi... | 09/15/1998 |
| 5780984 | Apparatus and method for controlling rotation frequency of infinite variable-speed drive The invention provides an apparatus and a method for controlling the rotation frequency of an infinite variable-speed drive in which, when an error is caused in an output rotation frequency of the infinite variable-speed drive during a processing time per... | 07/14/1998 |
| 5774625 | Arrangement for monitoring the rotational speed of a rotary-anode drive motor of x-ray The invention relates to an X-ray apparatus, comprising a rotary-anode X-ray tube, a device for monitoring the rotational speed of a rotary-anode drive motor of the X-ray tube, a sensor circuit for determining an angle signal which is dependent on the pha... | 06/30/1998 |
| 5696871 | DC motor control circuit A DC motor control circuit which contains a DC motor as a part of bridge resistance constituting a bridge circuit includes a first terminal connected to one end of the DC motor in the bridge circuit. A switching transistor is connected to the first termin... | 12/09/1997 |
| 5655054 | Motor speed detecting device A device for detecting the speed of a plural-phase motor in which a speed deviation occurring every m periods is eliminated, to provide a speed detection signal high in accuracy at low cost. The motor speed detecting device in which, among drive signals d... | 08/05/1997 |
| 5524168 | Method and apparatus for DC motor speed monitoring In two embodiments of the present invention, the speed of a DC motor is determined by examining the signal at the negative terminal of the motor. The signal is high-pass-filtered to extract the AC component of the signal. The frequency of this signal is, ... | 06/04/1996 |
| 5508596 | Motion control with precomputation A system for controlling motion in machine tools and industrial robots. From the specification of a part to be cut or a path to be followed by a machine tool or a robot, the system calculates, for each axis, for each incremental step along the path, a pos... | 04/16/1996 |
| 5420960 | Motor control system A motor control system includes a microcomputer for executing a so-called software servo-control, and the microcomputer receives a speed signal and a phase signal from the motor. In the microcomputer, speed error data is evaluated on the basis of the spee... | 05/30/1995 |
| 5388176 | DC motor speed control system A speed controller for a DC motor minimizes speed droop and load droop through pulse width or frequency modulation. The controller provides an extra power increase upon engine starting or whenever a heavier load is temporarily encountered. The control cir... | 02/07/1995 |
| 5365385 | Method and apparatus for multirate sampling for disk drive spindle control In the spindle control system of the present invention the compensator is divided into two portions. The first portion is driven by a first clock signal at a first frequency and a second portion is driven by a second clock signal at a second frequency der... | 11/15/1994 |
| 5335307 | Precision electric motor speed A system and method for controlling the speed of an electric motor compares the actual speed of the motor with the desired speed of the motor. A digital comparison of the desired speed of the electric motor with the actual speed of the electric motor prov... | 08/02/1994 |
| 5313549 | Procedure for filtering the speed feedback signal A procedure is disclosed for filtering the speed feedback signal in an elevator motor drive which is provided with a speed controller and in which the speed of rotation of the motor is measured. The procedure of the invention involves sampling the speed f... | 05/17/1994 |
