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| Number | Title | Issue Date |
| 7409029 | Transmission device for automatically set an optimal point for a signal decision making There is provided a flexible transmission device capable of automatically setting an optimal point for a signal decision making with high accuracy, so that highly reliable high-quality signal regeneration control is achieved. A clock timing extraction circuit dynami... | 08/05/2008 |
| 7342986 | Digital PLL device A phase-locked-loop device includes a clock generator for generating a reference clock based on a binarized playback signal and a frequency of run-length data and for generating N-phase clocks using the reference clock, a pulse-length measuring device for measuring ... | 03/11/2008 |
| 7279857 | System, method, and computer-readable medium for reduction of commutation-related acoustic noise in a fan system A method for reducing commutation-related acoustic noise in a fan system is provided. A constant frequency periodic signal is generated and a fan commutation event is synchronized with a zero level value of the constant frequency periodic signal. A system for contro... | 10/09/2007 |
| 7265507 | Angular position and velocity estimation for synchronous machines based on extended rotor flux A method of correcting the determination of extended rotor flux using a lag function and a correction algorithm that closely approximates a pure integrator function to correct for lag function errors that can extend the EFS control down to dynamoelectric machine spe... | 09/04/2007 |
| 7259531 | Speed control of brushless DC motors The speed control apparatus comprises a plurality of Hall sensors, a plurality of switches, a turn-on control circuit, and a gate drive logic. The Hall sensors are configured to detect magnetic rotor sections of a poly-phase brushless DC motor at different positions... | 08/21/2007 |
| 7075261 | Method and apparatus for controlling a fan A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined amount of current, which may break the inertia of the fan propeller an... | 07/11/2006 |
| 7062160 | Monitoring current in a motor during acceleration to verify motor frequency lock Method and apparatus for accelerating a motor from an intermediate velocity to a final operational velocity. The motor is accelerated from rest to the intermediate velocity through application of fixed duration drive pulses to the spindle motor. Once the motor reach... | 06/13/2006 |
| 7026772 | Position sensorless drive for permanent magnet synchronous motors A sensorless motor control algorithm that single-handedly permits operation over the entire speed range from low speed to high speed. This “fusion” algorithm seamlessly fuses the position data generated respectively by high speed and low speed sensorless algorit... | 04/11/2006 |
| 6972539 | Disk drive employing commutation phase modulation and current modulation of a spindle motor A disk drive is disclosed comprising a spindle motor comprising a plurality of windings for rotating a disk. The spindle motor is rotated by commutating the windings over a plurality of commutation states, wherein audible noise generated by the disk drive is reduced... | 12/06/2005 |
| 6900604 | Drive control system for sensor-less motor A drive control system, with PLL control, drives a rotatable multi-phase sensor-less motor by switching a current of a field coil of each phase depending on the rotating phase of the motor. When the moto is driven, a desired phase is selected as a datection phase, a... | 05/31/2005 |
| 6885160 | Drive control The present invention is a drive control device for controlling an electric rotational actuator which moves the driver, including: a reference comparison signal generation circuit; a detection circuit for detecting the speed of the actuator and outputting this as a ... | 04/26/2005 |
| 6771033 | Drive control system for sensor-less motor A drive control system, with PLL control, drives a rotatable multi-phase sensor-less motor by switching a current of a field coil of each phase depending on the rotating phase of the motor. When the motor is driven, a desired phase is selected as a detection phase, ... | 08/03/2004 |
| 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 |
| 6541930 | Method for controlling an adjustment device that is driven in an electromotorical manner and used for window lifters for instance and a device for carrying out said method The invention relates to a method for regulating an electric-motor-driven adjusting device, in particular for vehicles, having a safety circuit (5) for reversing or stopping a drive motor, and to an apparatus for performing this method. To enable fast, sa... | 04/01/2003 |
| 6473657 | Adaptive motion controller An adaptive motion controller for driving a servo motor. The adaptive motion controller has an amplifier including a voltage command which can be set at a voltage at which the amplifier will be operated, a frequency selector which can be set at a frequenc... | 10/29/2002 |
| 6433496 | Semiconductor integrated circuit for motor control A motor controlling semiconductor integrated circuit for controlling a motor by a PLL control is provided comprising output transistors for driving a motor, a position detecting means detecting a rotational position of a rotor in said motor, for generatin... | 08/13/2002 |
| 6359402 | Method and system for determining movement of a motor in a vehicle power window system A method and system for detecting a change in the position of an electric drive motor in a vehicle power window system includes a current sensor for sensing a current of the motor, and generating an input signal having a phase associated therewith. A sign... | 03/19/2002 |
| 6278623 | System and method for compensating for voltage notches in two-phase phase locked loops A method and system for compensating for voltage notches in phase locked loop (PLL) control devices. A bridge firing controller receives signals representative of two of the line to line voltages received by the bridge. The controller includes a PLL synch... | 08/21/2001 |
| 6252362 | Method and apparatus for synchronizing PWM sinusoidal drive to a DC motor A method and circuit for operating a polyphase dc motor in which discontinuous sinusoidal drive voltages are applied to the windings of the motor in predetermined phases. The discontinuous portion of the sinusoid is timed with the bemf zero crossings. Bem... | 06/26/2001 |
| 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 |
| 6121747 | Electric motor controller A controller for an electric motor, includes a reference circuit and control circuitry. The reference circuit generates a reference signal having a phase and frequency determined in accordance with a set of motion parameters input to the circuit. The cont... | 09/19/2000 |
| 6111384 | Method for controlling motor speed A method of controlling motor speed. The motor speed control apparatus includes an encoder in mechanical association with the motor. The encoder has one channel providing an encoder signal having a rising and falling state transition for each period of th... | 08/29/2000 |
| 6100661 | Time-discrete phase-locked loop A time-discrete phase-locked loop includes a discrete time oscillator (DTO) which supplies a periodical oscillator signal (OS) representing oscillator values (OV) at corresponding clock instants (TC) of a clock signal (CLK). A position-determining circuit... | 08/08/2000 |
| 6006008 | Motor drive system controlled by a phase accumulator and method therefor A high resolution speed control for a DC or BLDC phase-locked-loop (PLL) motor is provided. A phase accumulator sends a time varying frequency reference to the PLL input, where the average frequency sets the motor speed with a high degree of accuracy. A p... | 12/21/1999 |
| 5998947 | Method capable of surely chucking a FD inserted in a high-density type FDD In a method of starting rotation of a magnetic disk medium of a large-capacity flexible disk by a spindle motor for use in a high-density type flexible disk drive for carrying out data recording and reproducing operation to and from the magnetic disk medi... | 12/07/1999 |
| 5990656 | Frequency detector A frequency detector for a PLL controller, the controller being for generating an output signal to control a motor driver electrically connected to a motor having multiple phase windings arranged as a stator and a rotor having a permanent magnet or a DC c... | 11/23/1999 |
| 5790971 | Frequency-locked stepping position control system A frequency-locked stepping position control servo (FLSPS) system for driving a stepping motor. It essentially comprises a means for driving the stepping motor to move an object toward a target according to a driving signal, a means for detecting position... | 08/04/1998 |
| 5572099 | Motor speed control with current limit A phase-locked loop (or frequency-locked loop) based circuit for controlling the drive applied to a DC polyphase motor is disclosed. The disclosed circuit includes a clamp circuit, connected to the input of the motor drive amplifier, for limiting the curr... | 11/05/1996 |
| 5563980 | Brushless DC motor speed controller Provided is a brushless DC motor speed controller in which the speed feedback signal needed for speed control is obtained from the commutation signals generated by the magnetic-pole sensor in the brushless DC motor. The-brushless DC motor speed controller... | 10/08/1996 |
| 5451846 | Low current compensation control for thyristor armature power supply A control system for energizing a direct current (DC) motor with alternating current (AC) power includes a first voltage sensor for a peak voltage of AC power; a second voltage sensor for a counter electromotive force (EMF) of the motor; a current sensor ... | 09/19/1995 |
| 5375186 | Device for speed stabilization of a motor employing phase comparison An apparatus for stabilizing the speed of a motor has a phase comparator that identifies a phase difference between a reference signal and a speed signal. The apparatus acquires the speed of the motor and generates an output signal proportional to the ide... | 12/20/1994 |
| 5293445 | AGC with non-linear gain for PLL circuits A circuit automatically changes the gain in a PLL for driving a motor of the type having a motor speed signal that indicates the speed of motor rotation. The circuit includes a phase detector for sensing a phase difference between the motor speed signal a... | 03/08/1994 |
| 5223772 | Method and apparatus for providing the lock of a phase-locked loop system from frequency sweep Synchronization of the output of an internally-driven VCO to an exterior clock signal is obtained by using the exterior clock signal to re-start the VCO at every exterior clock pulse, until the pre-set VCO frequency is reached. At that point, the restarti... | 06/29/1993 |
| 5212434 | Phase-locked step motor speed servo controller A speed controller is equipped to a step motor for controlling the rotation of the step motor with a desired angular velocity. The step motor speed controller utilizes a phase-locked stepping servomechanism (PLSS) in which a phase-controlled oscillator (P... | 05/18/1993 |
| 5115172 | Phase locked loop speed control circuit for controlling speeds and relative positions of objects The invention concerns a phase locked loop speed control circuit for controlling the speeds of two or more objects. It includes pulse generators for generating reference pulses, first counters for counting each of these reference pulses, encoders for dete... | 05/19/1992 |
| 5086261 | Motor speed control device for use in an image forming apparatus A motor speed control device for use in an image forming apparatus with a differential phase detection circuit for outputting differential phase data between the clock pulse and a frequency proportional signal representative of the motor speed and a diffe... | 02/04/1992 |
| 5012204 | Phase control circuit for regulating a CD player drive A phase control circuit in which a first phase comparator compares an input frequency with a reference frequency. The output of the first phase comparator is connected to a controlled oscillator through a control stage. A second control stage is also conn... | 04/30/1991 |
| 4958948 | System for driving a brushless motor A system for driving a brushless motor comprises motor drive coils belonging to a plurality of phases respectively, a plurality of pairs of drive transistors connected to the drive coils respectively, a distribution circuit for sequentially distributing d... | 09/25/1990 |
| 4843288 | Phase locked motor control system for multiple disk drive units A motor control system and related method are provided for phase and frequency locked operation of multiple spindle motors in a computer disk drive environment or the like, for coupling two or more disk drive units together to provide expanded data storag... | 06/27/1989 |
| 4818922 | Optical commutation for permanent magnet motors The present invention deals with an apparatus and method for starting and running permanent magnet motors based on angular position information using an optical commutation technique. The optical commutation technique provides rotor position information a... | 04/04/1989 |
