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| Number | Title | Issue Date |
| 7977905 | Electric drive An electric drive which has an inductor with poles, an armature having a plurality of windings and rotatable relative to the inductor and its poles, and a control unit which, when a respective one of the windings of the armature approaches a respective one of the po... | 07/12/2011 |
| 7423396 | Hall sensor alignment for BLDC motor A technique for determining an alignment error of a Hall sensor location in a brushless DC motor drive, by measuring the back EMF waveform, preferably while the motor is coasting. According to the technique, an angular offset is calculated between a selected BEMF wa... | 09/09/2008 |
| 7313341 | Image forming apparatus with another secondary power supply An image forming apparatus including: a fixing unit; a main power supply that provides a portion of the heaters with voltage; and a secondary power supply that provides another portion of the heaters connected to the portion of the heaters in parallel with power pro... | 12/25/2007 |
| 7301298 | Back EMF detection circuit and method for a sensorless brushless DC (BLDC) motor A prior art direct back EMF detection method synchronously sampled motor back EMF during PWM “off” time without the need to sense or re-construct the motor neutral in a sensorless brushless DC (BLDC) motor drive system. Since this direct back EMF sensing scheme ... | 11/27/2007 |
| 7268503 | Vibration linear actuating device, method of driving the same device, and portable information apparatus using the same device A vibration linear actuating device includes a vibrating linear actuator and a driver (52) for driving actuator. Actuator includes mover having permanent magnet magnetized in a radial direction, stator having coil (2) and facing the permanent magnet, a... | 09/11/2007 |
| 7256560 | Circuit arrangement for supplying a control electronics system in electric machines A circuit configuration for supplying the control electronics in an electrical machine is specified, which includes a passive transformer circuit, which is powered by a phase current IP of the electrical machine and which generates an auxiliary voltage VA that is us... | 08/14/2007 |
| 7253573 | Power source for a hybrid vehicle A power source for a hybrid vehicle is provided which can protect its electric motor driving circuit from being damaged by a back electromotive force generated in a motor. The back electromotive force generated in an electric motor is detected by a high voltage dete... | 08/07/2007 |
| 7224078 | Electric rotating machine for vehicle In a vehicle electric rotating machine having a power section formed of a pair of inverter modules of switching elements and diodes connected in parallel thereto, and a control circuit section that controls mentioned power section, there are separately located the c... | 05/29/2007 |
| 7173394 | Apparatus and method for controlling inverter An apparatus and method for controlling an inverter are disclosed to allow an inverter to provide a stable output voltage to a motor regardless of a change in a DC input voltage. A difference value between a reference voltage according to a predetermined rated volta... | 02/06/2007 |
| 7141949 | Low noise back EMF sensing brushless DC motor A low noise electronic three phase bridge controlled brushless DC motor suitable for whiteware appliance pumps and other appliance applications. Back EMF zero crossing sensing is used to determine rotor position and thus stator winding commutation times. Motor torqu... | 11/28/2006 |
| 7073614 | Bipedal robot with storage battery A bipedal robot of the present invention has a trunk consisting of an upper trunk and a lower trunk which are rotatable around a rotation axis relative to one another. The upper trunk has shoulders on the right and left sides. An arm is provided at each shoulder. A ... | 07/11/2006 |
| 7068094 | Charge-pump current source Systems, methods and apparatus relating to electronic circuits and signal processing are provided. In one aspect, a circuit is provided that includes a charge-pump operable to supply an output voltage, and a current mirror in communication with the charge-pump. The ... | 06/27/2006 |
| 7034496 | Pointing position correcting method, pointing position correcting apparatus, and pointing apparatus A method of correcting a pointing position of a pointer rotated by a stepper motor includes the steps of: performing a prereset operation in which the pointer is rotated to a reset operation starting position that represents a pointing position of the pointer which ... | 04/25/2006 |
| 6995530 | System, method, and an article of manufacture for starting a brushless direct current motor A system and a method for starting a brushless DC motor are provided. The method includes applying commutation pulses to at least two phase coils to induce a rotor to rotate to a starting position and then de-energizing the at least two phase coils. The method furth... | 02/07/2006 |
| 6981645 | Drive circuit for controlling a resonant motor A drive circuit for operating a resonant motor includes a motor circuit, a feedback circuit, a control circuit, and a coil drive circuit. A feedback loop includes the motor circuit, the feedback circuit, and the control circuit. The feedback loop in conjunction with... | 01/03/2006 |
| 6965488 | Disk drive controlling ripple current of a voice coil motor when driven by a PWM driver A disk drive is disclosed comprising a pulse width modulated (PWM) signal generator for generating PWM control signals applied to the driver switches of a voice coil motor (VCM). The PWM control signals comprise a PWM cycle time, a Tforward time interval of the PWM ... | 11/15/2005 |
| 6949901 | System and method for controlling a steering position of rear vehicle wheels A system and a method for controlling a steering position of at least one rear wheel of a vehicle are provided. The vehicle has both a brushless electric motor with a plurality of electrical phase windings and a steering actuator. The brushless electric motor has a ... | 09/27/2005 |
| 6943531 | Portable power supply incorporating a generator driven by an engine A portable power supply includes an engine-driven generator that generates a first AC power. A rectifier rectifies the first AC power to a first DC power. A DC/DC converter converts a second DC power from a storage unit to a third DC power. A controller selectively ... | 09/13/2005 |
| 6933702 | Control method and system for motor The invention relates to a control method and a control system for a motor. The control method and the control system of the invention transfer the motor dynamic equations of the synchronous d-q frame into a motor parameter (for example, the leakage inductance) and ... | 08/23/2005 |
| 6915538 | Smooth start system for power chair An apparatus, method and program product gradually and automatically accelerates or decelerates chair motor speed to achieve a smooth, nearly imperceptable movement of the chair. To this end, voltage is apportioned to the motor according to an acceleration profile. | 07/12/2005 |
| 6903532 | Method and apparatus for starting an induction motor A starting circuit for an induction motor is provided whereby a stationary rotor flux is established then a stored charge supplied to a motor winding in order to provide a starting torque. Before applying a mains power supply to the motor after the starting torque h... | 06/07/2005 |
| 6894450 | Circuit configuration for permanent magnet synchronous motor control Circuits and methods for use with an integrated circuit chip having internal back EMF estimation to control a permanent magnet synchronous motor includes an AC current feedback circuit, a scaling circuit, and a current regulator. Additionally, a speed regulator may ... | 05/17/2005 |
| 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 |
| 6859001 | Torque ripple and noise reduction by avoiding mechanical resonance for a brushless DC machine A method of reducing torque ripple and noise for an brushless DC machine comprising: determining a control frequency for the electric machine, the control frequency indicative of an existing current command to and a rotational velocity of the electric machine; multi... | 02/22/2005 |
| 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 |
| 6836092 | Methods and circuits for detecting operational information of DC Fans Methods and circuits detect operational information about DC fans powered by pulse width modulation, such as detecting fan presence in a device and/or detecting rotational speed. Output pulses produced by the fan related to the rotational speed are utilized to produ... | 12/28/2004 |
| 6759824 | Motor controller and method of driving DC motor 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... | 07/06/2004 |
| 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 |
| 6741056 | Air sampler with compensating pump motor speed A constant flow of air through a personal air sampler is provided regardless of changes in the air flow path, by altering the pump speed as a function of the power taken by the pump. The characteristics of the pump are precalibrated to provide a constant used togeth... | 05/25/2004 |
| 6731087 | Fan motor A fan motor includes a rotor coil and a stator coil. The stator coil has its starting coil or rotating coil provided with an auto-coupling tapped coil or a third coil to make up a secondary coil of the starting coil or the rotating coil. The tapped coil or the secon... | 05/04/2004 |
| 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 |
| 6717380 | Method for shifting the instant of commutation for a sensorless and brushless direct-current motor as well as a system for implementing the method The present invention provides a method for shifting the instant of commutation for a sensorless and brushless direct-current motor (1), whose stator windings are fed by a multi-phase converter connection. The converter connection includes an output stage con... | 04/06/2004 |
| 6703805 | System for measuring the position of an electric motor An electric system utilizes dynamic impedance changes in windings of an electric motor to measure/monitor mechanical position. The method employs a bridge amplifier to measure voltage at a center node or windings against a voltage derived from a reference... | 03/09/2004 |
| 6661192 | Controlling a brushless DC motor Systems and methods for controlling a polyphase brushless direct current (DC) motor (42) are described. One system includes a meter (14) coupled to a motor terminal (A, B, C) and adapted to produce a range of digital output values (44) representative of a... | 12/09/2003 |
| 6653809 | Method for head positioning A method for head positioning utilizing a positioning device that moves a head includes receiving position commands that control the positioning device and determining whether or not the distance between the current position and the movement target positi... | 11/25/2003 |
| 6642679 | Car motor driving apparatus In a car body provided with a battery with a low output voltage of 12 V, a step-up circuit unit is connected between the battery and an electromechanical energy converting section. In a car provided with a battery with a high output voltage of 36 V, the b... | 11/04/2003 |
| 6639373 | Driver circuit for a voice coil motor in a disk drive system The present invention provides an apparatus and system (300) supplying a regulated voltage of sufficient magnitude to enable de-latching of a head carriage from a latching device. In at least one embodiment, providing a voltage source for the voice coil m... | 10/28/2003 |
| 6633145 | Circuit for improved back EMF detection A system and method of advancing the commutation sequence of a brushless DC motor is provided. The motor having a plurality of coils, each of the coils coupled together at one end to a common center tap and coupled at an opposite end, through a respective... | 10/14/2003 |
| 6603280 | Motor controller A converter module which receives an AC voltage, converts the AC voltage to a DC voltage, and outputs the DC voltage to a circuit for driving a motor. The converter module includes a switching device, a diode, and a control circuit which controls the DC v... | 08/05/2003 |
| 6600279 | Circuit for the sensorless commutation of a DC motor The system provides for the commutation of a brushless direct-current motor. A virtual star is provided that is analogous to the motor. The virtual star is formed of resistors. A comparison device continuously comparing the voltages of the two star center... | 07/29/2003 |
