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| Number | Title | Issue Date |
| 7667417 | Apparatus and method compensating recurring false speed errors in DC motor and disk drive adopting same Provided are an apparatus and method of controlling a motor by compensating for recurring false speed errors generated in a direct current (DC) motor. The apparatus includes a learning control unit adapted to calculate recurring false speed errors related to a mecha... | 02/23/2010 |
| 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 |
| 7372224 | System and method for determining barrier motor parameters without using sensors A barrier operator comprises a first measuring apparatus for measuring a current used by a direct current (dc) motor to move a barrier and a second measuring apparatus for measuring a generated voltage of the dc motor. A controller is coupled to the first measuring ... | 05/13/2008 |
| 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 |
| 7242160 | Starting method for Hall-less single-phase BLDCM The methods for starting a Hall-less single-phase BLDCM having an asymmetrical air gap are proposed. The provided methods are employed to input a specific amount of current impulse and stop the current impulse at a specific time such that the rotor of the single-pha... | 07/10/2007 |
| 7230358 | Electrical resonance circuits for high efficiency direct current motors Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “lin... | 06/12/2007 |
| 7183734 | Sensorless control of two-phase brushless DC motor A motor control system for a two-phase brushless DC motor uses measured EMF voltage from the passive set of stator coils to control commutation. A microcontroller receives the EMF voltage measurement and compares it to a threshold voltage value, which may be speed-d... | 02/27/2007 |
| 7170249 | Electrical phase compensation in BEMF spindle motor control A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed ... | 01/30/2007 |
| 7166980 | Methods and apparatus for monitoring a brushed permanent magnet motor using back-emf measurements Techniques sense a back-emf voltage from a brushed permanent magnet motor. Such techniques can be used for a variety of purposes, such as to estimate the current that is being applied to the motor, to estimate the motor's velocity, position, torque, and the like. On... | 01/23/2007 |
| 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 |
| 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 |
| 6956342 | Driving circuit for a DC brushless fan motor The present invention is a driving circuit for a DC brushless fan motor, comprising a control unit, a motor, a Hall element, a signal output unit, a temperature control circuit, a reverse protection circuit and a counter-electromotive force (CEMF) removal circuit, a... | 10/18/2005 |
| 6901212 | Digital adaptive sensorless commutational drive controller for a brushless DC motor A digitally adaptive controller circuit for commutating a brushless, sensorless, DC motor in either of two directions adapted to receive digital back electromotive force (BEMF) detector signals. The digital circuit is driven by an input clock that is adjustable to c... | 05/31/2005 |
| 6885163 | Method for starting a brushless d.c. motor A process to start a brushless direct current motor with a multiphase stator winding is disclosed, in which, during rotor standstill, a plurality of current impulses is intruded on the stator winding, the current rise time until a current threshold is reached is mea... | 04/26/2005 |
| 6876169 | Method and controller for field weakening operation of AC machines Method for providing current regulation and a current controller (10) for an electric machine (30) are provided. The method includes receiving a state vector time signal (36) indicative of a time interval when a switching state vector is activat... | 04/05/2005 |
| 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 |
| 6850022 | Method and system for determining electronic commutation in brushless DC machines irrespective of the placement of rotor position sensors A method and system for determining the commutation position in a DC machine using a single-bit rotor sensor and the back EMF signal from a stator winding by calculating a delay value, which is equal to the time elapsed between detection of the position signal and t... | 02/01/2005 |
| 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 |
| 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 |
| 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 |
| 6721496 | Electrical resonance circuits for high efficiency direct current motors Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “lin... | 04/13/2004 |
| 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 |
| 6664749 | Spindle motor initialization after a control processor reset condition in a disc drive Method and apparatus for initializing a disc drive to bring a spindle motor to a final, operational velocity after a disc drive processor reset condition. The spindle motor is rotated using electronic commutation and back electromotive force (bemf) detect... | 12/16/2003 |
| 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 |
| 6608458 | Electric motor, in particular wiper motor An electric motor for operating a device for wiping a window of a motor vehicle has an electric motor part, and a control device for controlling/regulating a power of the electric motor part, the control device being formed so that it is programmable with... | 08/19/2003 |
| 6580236 | Brushless motor drive circuit having low noise and high efficiency A motor drive circuit for driving a brushless motor having a rotor and exciting coils of respective phases. A square wave rotor position signal for each phase is produced wherein a half period of the rotor position signal corresponds to a time period from... | 06/17/2003 |
| 6518719 | Power tools with operating speed control circuit A variable speed power tool may include a speed adjusting device and/or a maximum speed adjusting device for adjusting the operating speed, and a fixed operating speed switch. An operator adjustable speed adjusting device having a position maintaining mec... | 02/11/2003 |
| 6512346 | Motor driving apparatus An error such as disconnection or short on the current path from said dc power supply to a switching element via the dc motor is detected by judging whether variation in a voltage at a junction point between the dc motor and the switching element tracks v... | 01/28/2003 |
| 6504328 | Sensorless motor driver with BEMF mask extender A motor control circuit wherein Bemf zero crossings are sensed to provide phasing information. To avoid incorrect timing (due to detection of zero crossings which may be caused by switching noise when the power transistors switch to commutate other phases... | 01/07/2003 |
| 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 |
| 6420847 | Device for detection of current or voltage on a PWM driven winding with reduced jitter and related methods A method for detecting a zero-cross event of an induced back electromotive force (BEMF) or of a nullification instant of a periodic current in a PWM driven winding, by circuits generating an analog signal representative of the induced BEMF or of the nulli... | 07/16/2002 |
| 6380703 | Digital PLL filter and VCO for use in controlling a spindle motor of a mass data storage device A circuit for providing commutation control signals to a commutator for a polyphase brushless dc motor in a mass data storage device includes an accumulator (48) to accumulate a digital count that is proportional or related to a phase difference between t... | 04/30/2002 |
| 6377008 | Motor driving device In a motor driving device, the currents supplied from a driver (3) to three-phase coils (2) of a motor are made to flow through a resistor (R), and the voltage appearing across this resistor (R) is fed to the positive input terminal of a current limiting ... | 04/23/2002 |
| 6215261 | Application specific integrated circuit for controlling power devices for commutating a motor based on the back emf of motor A motor for use with a power supply comprising a stator, a rotor in magnetic coupling relation to the stator, a plurality of insulated gate bipolar transistors (IGBTs), a user interface, a microcontroller and an application specific integrated circuit (AS... | 04/10/2001 |
| 6184645 | Voltage mode drive for control circuit for an actuator using sampled back EMF control An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first summing node is provided having a control output voltage, for su... | 02/06/2001 |
| 6084377 | Voltage vector overmodulation technique considering counter electromotive force of motor A voltage vector overmodulation technique considering a counter electromotive force of a motor with respect to a voltage applied to the motor in a transient state during the operation of the motor, selects a voltage having the least logarithmic difference... | 07/04/2000 |
