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| Number | Title | Issue Date |
| 7341321 | Rotation detecting device and anti-skid braking system using the same A rotation detecting device that includes an electric power generator having a stator and a rotor, said rotor having a plurality of alternating opposite magnetic poles in a circumferential direction of the rotor, at least a first magnetic sensor mounted on either th... | 03/11/2008 |
| 7333080 | Color OLED display with improved power efficiency An OLED display device includes: an array of light emitting pixels, each pixel having red, green, and blue OLEDs and at least one additional colored OLED that expands the gamut of the display device relative to the gamut defined by the red, green and blue OLEDs, whe... | 02/19/2008 |
| 7304470 | Fan operating status monitoring system A fan operating status monitoring system includes a detecting module to detect pulsation currents generated by the rotation of a fan, and further convert the detected pulsation currents to voltage signals, thereby allowing a differential magnifying module, a first p... | 12/04/2007 |
| 7265538 | Method and device for measuring the rotational speed of a pulse-activated electric motor based on a frequency of current ripples A method and a device for measuring the speed of a pulse-activated electric motor are described. According to this method, the motor is fully activated at time intervals to be determined for a defined measuring time by the circuit element provided for timing and, in... | 09/04/2007 |
| 7242175 | Determining rotation of a freewheeling motor A device and method that determine a freewheeling rotation of an electric motor. The method includes steps of measuring first and second signals from respective first and second windings of an unenergized motor, and determining from the first and second signals whet... | 07/10/2007 |
| 7227321 | System and method for detecting back electromotive force with automatic pole calibration A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in ... | 06/05/2007 |
| 7221152 | Method in salient-pole permanent magnet synchronous machine A method for determining the speed and position of a rotor of a salient-pole permanent magnet synchronous machine, the method comprising the steps of creating a voltage model (41) on a permanent magnet synchronous machine, forming a voltage reference (us... | 05/22/2007 |
| 7215094 | Method for sensing the back electromotive force induced in the winding of a voice coil motor A method for sensing a back electromotive force induced in a winding of a voice coil electro-mechanical actuator controlled in a discontinuous mode by alternating conduction phases to off-phases includes sensing voltage at terminals of the winding during an off-phas... | 05/08/2007 |
| 7210656 | Control, sound, and operating system for model trains A model train operating, sound and control system that provides a user with increased operating realism. A novel remote control communication capability between the user and the model trains. This feature is accomplished by using a handheld remote control on which v... | 05/01/2007 |
| 7193804 | Method and apparatus for controlling head velocity in a disk drive during ramp load/unload A disk drive controls head velocity during ramp load/unload by measuring voltages across a VCM and a sense resistor in series with the VCM, calculating a back EMF voltage using the VCM and sense resistor voltages, and adjusting the head velocity using the back EMF v... | 03/20/2007 |
| 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 |
| 7187180 | Method of sensing motor winding current in integrated stepper motor buffer A method and motor controller for sensing motor winding current. An FET drive transistor has its ON resistance periodically increased to about five times the normal ON resistance for short sensing intervals during motor drive. An analog-to-digital converting senses ... | 03/06/2007 |
| 7180257 | Method of brake pulse rejection in commutation pulse detection circuits A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry.... | 02/20/2007 |
| 7164273 | Power source monitor A power source monitor and method to monitor various operating line conditions of an electrical power outlet comprising measuring line voltage and frequency, analyzing wiring conditions, displaying the line conditions and generating an alarm when any of the line con... | 01/16/2007 |
| 7157874 | Electric power steering device An electric power steering device comprising a control unit capable of distinguishing a failure of a motor current detection device caused by a change in power voltage, an oxide film formed on the commutator of a motor or the contact point of a relay, etc. from a fa... | 01/02/2007 |
| 7122982 | DC motor rotation information detecting device A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplie... | 10/17/2006 |
| 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 |
| 7075290 | Tachometer apparatus and method for motor velocity measurement A method and apparatus for determining the velocity of a rotating device is described herein. The apparatus includes a magnet assembly affixed to a rotating shaft of a rotating device and a circuit assembly. The circuit assembly includes a circuit interconnection ha... | 07/11/2006 |
| 7030580 | Motor/generator transient response system A transient response system includes a power source operable to generate a power output and a transmission operatively coupled to the power source. The transient response system also includes a generator operatively coupled to the power source and a controller in co... | 04/18/2006 |
| 7009806 | Accurate tracking of coil resistance Methods and computer program products for determining accurate estimates of coil resistance are provided. Current differences between pairs of current values are determined. Additionally, voltage differences between pairs of actuator coil voltages (corresponding to ... | 03/07/2006 |
| 7002308 | Motor driving control method and apparatus with amplitude regulation circuit An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal switches between signals V1, V2, and V3. The ampl... | 02/21/2006 |
| 6965208 | Motor speed detecting device for use between motor and system A motor speed detecting device for use between a motor and a system is provided. A motor speed detecting device for use between a motor and a system includes a first input terminal and a second input terminal, wherein the first and second input terminals are electri... | 11/15/2005 |
| 6718273 | Methods for simplified field-oriented control of asynchronous machines A method for generating manipulated variables for the direct-axis and cross voltage, respectively, to represent the flux-forming current ID and torque-forming current IQ in field-oriented control of asynchronous machines, taking into account the stator voltage drop ... | 04/06/2004 |
| 6703824 | Low-cost power measurement device for a plurality of motors A device for measuring the power of a motor, having a measurer for measuring the current sent to the motor and a measurer for measuring the voltage, related to the current, that is sent to the motor, a rephaser for rephasing the waveform of the voltage me... | 03/09/2004 |
| 6674191 | Motor actuator control system and method for controlling motor actuator A motor actuator control system includes a motor actuator having a motor, an output shaft for outputting rotation of the motor at reduced speed, and a gear train for transmitting rotation to the output shaft while reducing rotataional speed. The system fu... | 01/06/2004 |
| 6671639 | Method of determining speed of rotation of squirrel-cage motor and a computer software product to carry out the method The present invention relates to a method of determining a speed of rotation of a squirrel-cage motor, wherein samples from the current taken by the squirrel-cage motor are collected by an electric current measuring device at a predetermined sampling freq... | 12/30/2003 |
| 6532405 | Method for detecting a locked axle on a locomotive AC traction motor An exemplary embodiment of the invention is a method for detecting a potentially locked axle on a vehicle propelled by an AC motor. The method includes conducting a speed test by estimating axle speed and comparing estimated axle speed to measured vehicle... | 03/11/2003 |
| 6366077 | Apparatus and method for detecting the rate of rotation of DC spindle motor An apparatus and method for detecting a rate of rotation of a DC spindle motor without using an additional frequency generation (FG) signal generator in electronic equipment using the DC spindle motor. The apparatus detects the rate of rotation of a DC mo... | 04/02/2002 |
| 6323779 | Displacement sensing apparatus A pedal stroke sensor a rotor that rotates with a brake pedal with a pair of brushes fixed on the rotor. The brushes are inclined oppositely to each other along rotating direction of the rotor and contact a circuit printed on a circuit board to generate o... | 11/27/2001 |
| 6222362 | Method for detecting the position and direction of motion of a moving part mounted on an electric motor A method is presented for detecting the position and the direction of motion of a movably mounted part on an electric motor that makes provision not only for a single-channel sensor but also a measuring arrangement for the motor current and the rectified ... | 04/24/2001 |
| 6208132 | Non-intrusive speed sensing for induction motors A sensing coil affixed to the outside of an induction motor housing uses flux signals from the motor to measure motor speed. In particular, components of the rotor current are measured and compared to analysis from stator fundamentals and sidebands to det... | 03/27/2001 |
| 6172473 | Device for determining rotational number of DC motors A device for determining a rotational number of an electric dc motor which drives a moving body of an automobile accessory such a sunroof, or a glass pane of a power window includes a switched capacitance filter for eliminating noise from the motor, a cut... | 01/09/2001 |
| 6144198 | System and method for determining rate of rotation using brushless DC motor A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is squared. The squared outputs associated with each winding ... | 11/07/2000 |
| 6144179 | Method for establishing the rotational speed of mechanically commutated d.c. motors The method for determining the rotational speed and/or the angle of rotation of mechanically commutated d.c. motors from the variation with respect to time of the ripple of the motor current occurring during commutation is supplemented and checked by a mo... | 11/07/2000 |
| 6130533 | Fan speed detecting circuit A fan speed detecting circuit includes a resistor installed in the grounding line of the power circuit of the DC fan motor of a cooling fan, a capacitor, a diode connected between the resistor and the capacitor, and a comparator having an inverter termina... | 10/10/2000 |
| 6127820 | Process and circuit arrangement for determining the speed of a D.C. motor without a speedsensor A process and circuit arrangement are disclosed for determining the speed of a direct current motor (10). The motor data influencing the speed (n) of the motor (10) depend on the operating state of the motor (10), and this dependence is compensated during... | 10/03/2000 |
| 6084398 | Rate of rotation measurement using back-EMFS associated with windings of a brushless DC motor A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is integrated and multiplied by the back-emf associated with ... | 07/04/2000 |
| 6081112 | Method and circuit for determining the velocity of a data detector mechanism of a mass storage device, or the like, using a BEMF voltage in the associated voice coil A circuit and method for measuring a back EMF voltage of a voice coil in a mass storage device, or the like, includes an amplifier connected across the coil to produce an output signal proportional to a voltage across the coil and a circuit connected to s... | 06/27/2000 |
| 6060879 | Current magnitude sensing circuit A current magnitude sensing circuit for detecting a malfunction of a DC brushless fan. The current magnitude sensing circuit detects drops in the current magnitude in windings of a fan motor. Depending on the frequency of the current drops in the fan curr... | 05/09/2000 |
| 6054791 | Direct current motor with imbalanced winding for closed-loop feedback control A direct current motor for use in a closed-loop control system is disclosed that includes a rotating commutator having a plurality of slots, a plurality of windings, the number of windings that conduct current corresponding to one less than the number of ... | 04/25/2000 |
