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| Number | Title | Issue Date |
| 7630616 | Coil load driving circuit and optical disc device A coil load driving circuit in which generation of radiation noise when a motor is stationary is minimized, includes output buffers that output a PWM pulse to both terminals of a motor; a transfer voltage generating circuit that outputs transfer voltages VTR1 | 12/08/2009 |
| 7386224 | DC brushless fan motor driving circuit A DC brushless fan motor driving circuit has a Hall PWM signal generator, a speed signal generator, a PWM driver and a full-bridge switching circuit. The Hall PWM signal generator obtains a Hall sine wave signal from an external Hall sensor and converts the Hall sin... | 06/10/2008 |
| 7359166 | Method and control system for controlling electric motors There is described a method for controlling an electric motor comprising an operating relay having relay windings with respective first and second relay contacts and a control means, which motor via current conductors is connected to said relay and a power source wh... | 04/15/2008 |
| 7339338 | Method for operating a door and a door drive for carrying out this method A door, especially a sectional door, is operated with the use of a drive unit with a drive gear, a clutch, and a position-detecting unit. The position-detecting unit detects the direction of rotation of the drive gear, detects the number of revolutions of the drive ... | 03/04/2008 |
| 7260319 | Abnormality monitoring device for motor control system An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device ca... | 08/21/2007 |
| 7253574 | Effective switching frequency multiplier inverter A switching frequency multiplier inverter for low inductance machines that uses parallel connection of switches and each switch is independently controlled according to a pulse width modulation scheme. The effective switching frequency is multiplied by the number of... | 08/07/2007 |
| 7211971 | Linear actuator A linear actuator having a housing, a plunger slidably mounted to the housing between an extended and retracted position, and an electric motor drivingly connected to the plunger to move the plunger between its extended and retracted positions. A motor circuit contr... | 05/01/2007 |
| 7196482 | PWM controller with automatic low battery power reduction circuit and lighting device incorporating the controller A controller for controlling a voltage applied to a load from a power source includes a square wave producing circuit for connection in the circuit with the battery and the lamp. The square wave producing circuit produces a variable duty cycle square wave for contro... | 03/27/2007 |
| 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 |
| 7184481 | Audio reproducing apparatus and method A comparator (12) for compensating the pulse width of the drive control signal of a power amplifier (54) by using a sense signal of an offset voltage generated between the nodes (H, I) of the power amplifier (54) is provided to enlarge the time ... | 02/27/2007 |
| 7165439 | Battery powered hydraulic tool A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction ... | 01/23/2007 |
| 7161320 | Control device There is provided a control device for driving a movable member such as a power window of a vehicle under control, in which the action of the movable member (including the manual operation) at an action velocity corresponding to the intention of the user is achieved... | 01/09/2007 |
| 7157875 | Method and system for fail-safe motor operation An electric device includes a motor and a motor drive for commanding a torque generated by the motor. A fault control circuit detects a fault condition associated with the motor drive. Upon detection of the fault condition, the fault control circuit adjusts the torq... | 01/02/2007 |
| 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 |
| 7124691 | Method for monitoring and controlling locomotives The present invention is directed to a locomotive comprising energy storage units, such as batteries, a prime energy source, such as a diesel engine, and an energy conversion device, such as a generator. The locomotive comprises one or more of the following features... | 10/24/2006 |
| 7111488 | Battery powered hydraulic tool A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction ... | 09/26/2006 |
| 7092623 | Method and apparatus to achieve accurate fan tachometer with programmable look-up table A system and method for measuring the speed of a fan is presented. The duty cycle of a pulse width modulated (PWM) power signal may control speed of the fan. The fan may generate tachometer pulses used for monitoring RPM of the fan. Very low frequency test pulses ma... | 08/15/2006 |
| 7023154 | Train speed control using current and velocity sensing A method for speed control for a motor of a locomotive of a model electric train is presented. A method in accordance with the present invention includes sensing an operating velocity of the motor and the operating current provided to the motor, and then producing a... | 04/04/2006 |
| 7023152 | Driving control device for actuator A driving control device for an actuator comprises a driving device to drive an actuator having an electric motor (30) and a driving control device (50) to control the rotation of the electric motor (30) by controlling the driving device. The dr... | 04/04/2006 |
| 7006762 | Pulse width modulator The present invention encompasses a high efficiency pulse width modulator comprising: a variable duty cycle oscillator for receiving an input signal and providing a low level switching signal; a source voltage differentiation dependant positive switching signal circ... | 02/28/2006 |
| 7006761 | Control device for DC motors In order to design as inexpensively as possible a control device for DC motors which are provided with a commutator for feeding their motor windings which has at least four sliding contacts, this device comprising a modulation stage which generates at least one cont... | 02/28/2006 |
| 6965206 | Method and system for fail-safe motor operation An electric device includes a motor and a motor drive for commanding a torque generated by the motor. A fault control circuit detects a fault condition associated with the motor drive. Upon detection of the fault condition, the fault control circuit adjusts the torq... | 11/15/2005 |
| 6957560 | Battery powered hydraulic tool A battery powered hydraulic tool including a frame; a battery connected to the frame; a motor connected to the frame and adapted to be powered by the battery; and a hydraulic pump connected to the motor by a gear reduction transmission. The motor and gear reduction ... | 10/25/2005 |
| 6933692 | Diagnostic method for an electric drive assembly A method and an electrical drive assembly 10 which operates in accordance with the method. Particularly, the drive assembly 10 includes a diagnostic portion 18 which compares a voltage signal which is communicated to an electrical machine 28 ... | 08/23/2005 |
| 6912353 | Brushless DC ring motor cooling system A method of operating a cooling fan in a cooling system for a vehicle includes determining a required speed of the cooling fan. First and second signals are provided to a motor controller operatively connected to a motor having a rotatable portion connected to the c... | 06/28/2005 |
| 6909573 | Disk drive including means for preventing rotation A motor controller includes DC motor, driving mechanism, voltage generator circuit and control unit. The driving mechanism moves an object having a predetermined mass against a load applied to the object and by transmitting a rotational force of the motor to the obj... | 06/21/2005 |
| 6861815 | Motor control drive circuit Embodiments of present invention may provide a motor control drive circuit for driving a motor by receiving signals from a digital signal control device. The motor control drive circuit includes a switching unit receiving signals that have undergone pulse width modu... | 03/01/2005 |
| 6828748 | Speed control circuit for a brushless dc motor A speed control circuit for a brushless dc motor includes a motor drive circuit, a drive member and a PWM control circuit. The motor drive circuit includes at least one coil and at least one transistor serially connected to the coil. The drive member is provided wit... | 12/07/2004 |
| 6775469 | Method of controlling an electronically commutatable motor An electronically commutatable motor having field windings activatable in sequence with a commutation frequency via semiconductor output stages using control signals connectable and disconnectable from a direct voltage supply, the control signals being clocked using... | 08/10/2004 |
| 6771034 | Children's ride-on vehicle with electronic speed control A children's ride-on vehicle having an electronic speed controller adapted to regulate at least one of the timing and rate of application of a selected rotational input. The vehicle includes a body with a seat, a steering mechanism positioned for operation by a chil... | 08/03/2004 |
| 6693400 | Multi-mode motor controller chip set A multi-mode motor controller architecture includes a motor, an integrated circuit controller, and an integrated circuit driver circuit. The integrated circuit controller includes a pulse generator, a DAC, an ADC, and a digital compensator circuit. The in... | 02/17/2004 |
| 6654548 | Method and apparatus for controlling the speed of rotation of a direct current motor for model vehicles The invention relates to a method for control of the speed of rotation of a separately excited direct current motor for model vehicles, the speed of rotation of the motor being controlled by means of a pulse sequence, the motor being alternately supplied ... | 11/25/2003 |
| 6433507 | Spread spectrum motor control circuit A motor control circuit for use in a motor circuit includes a varying duty cycle pulse width modulation circuit and a switch. The varying duty cycle pulse width modulation circuit is operable to generate a PWM signal having a varying duty cycle, wherein a... | 08/13/2002 |
| 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 |
| 6219603 | Steering control apparatus for vehicle A hand-off state determination section 73 estimates torque Th exerted on the steering handle by a driver. When the steering handle is in the hand-off state in which the torque is small, switching is effected to the side of compensator 75 having smaller ga... | 04/17/2001 |
| 6160955 | Control circuits of an apparatus for physical exercises Apparatus providing a control and protection arrangement for walking/running exercise machines which is effective to provide protection against malfunction conditions which may be experienced by the exercise machines, to thereby protect users of the exerc... | 12/12/2000 |
| 6154605 | Control device for diaphragm pump A control device for a DC motor driving a diaphragm pump including a pulse generating integral circuit and a variable voltage setting integral circuit. The variable voltage setting integral circuit sets a pulse-base voltage at a level such that the DC mot... | 11/28/2000 |
| 6072293 | Steering control system for vehicle It is an object of the present invention to provide a steering control system which can be used with a plurality of control modes, thereby reducing the cost. A first control unit of an electric power-steering system detects a reference current iREF | 06/06/2000 |
| 5994853 | Speed control system for a remote-control vehicle A remote-control vehicle includes a controller that produces a pulse-width modulated (PWM) motor control signal and a forward/reverse motor control signal in response to a transmitted digital signal specifying one of a multiplicity of speed control states... | 11/30/1999 |
| 5991505 | Switching motor control apparatus A motor control apparatus for controlling a motor is provided. The motor has an output power stage and a relay allowing power to be connected to the output power stage. The apparatus comprises a microprocessor providing a PWM cycle delivered through a cap... | 11/23/1999 |
