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| Number | Title | Issue Date |
| 7619383 | High steps brushless DC (BLDC) motor A brushless motor circuit is for driving a brushless direct current (BLDC) motor. The motor includes a rotor and exciting coils for respective phases in a three-phase winding in a star configuration. A neutral point in the star configuration is configured to switch ... | 11/17/2009 |
| 7202619 | Variable frequency drive for AC synchronous motors with application to pumps Two apparatuses are disclosed for controlling the speed of an AC synchronous motor-pump utilizing a series of stepped voltage pulses at the driving frequency. The first apparatus is an isolated variable frequency drive comprising step-down transformer 100, fu... | 04/10/2007 |
| 7135834 | Modified field oriented control In accordance with certain embodiments, the present technique provides a reduced current field-oriented-control scheme. For example, the present technique provides a method of controlling an induction device in which a predetermined reduction factor is employed to r... | 11/14/2006 |
| 7133602 | Power supply apparatus, motor drive control method using the same and motor vehicle having the same mounted thereon A power supply apparatus driving and controlling motor generators (MG1, MG2) includes a battery (10) generating an input voltage (Vb), a converter (110) converting the input voltage into a motor operating voltage (Vm) according to a volta... | 11/07/2006 |
| 6624601 | Control device for plurality of rotating electrical machines A control device for a plurality of rotating electrical machines has a single current control device with an inverter, gate driver, and a motor controller, which supplies a control current to each rotating electrical machine allowing rotation control in r... | 09/23/2003 |
| 6586904 | Compensation for variable voltage A switched reluctance drive is supplied from a voltage source which varies from the voltage at which the control laws for the drive were determined. The control system compensates for this by modifying both the speed and torque values used to determine th... | 07/01/2003 |
| 6445155 | Motor control A method of monitoring the operation of a brushless motor is disclosed. The method comprises the steps of monitoring the current flowing into or out of the windings of the motor using a current measurement circuit to produce an output signal indicative of... | 09/03/2002 |
| 6441579 | Current magnitude variation correction for open loop stepper motor driver circuit An available input of to a motor controller is used to measure the motor power supply voltage. Typically, a scaled down version of the voltage is sensed. The microprocessor is used to calculate the motor control current, in that case, is then calculated f... | 08/27/2002 |
| 6246209 | Control device for alternating current motor The present invention relates to a control of an AC motor, and in particular to a control device for an AC motor which can prevent an overvoltage from being applied to the motor, and minimize voltage consumption of a reactor itself during the starting and... | 06/12/2001 |
| 6140795 | Variable speed control for AC induction motors A speed control apparatus for varying the speed of an AC motor while maintaining the torque and power constant over a range of angular speeds The AC motor is driven by a D.C. source. A universal conmutator capable of providing two symmetrical non-contendi... | 10/31/2000 |
| 6107775 | Method and apparatus for limiting starting torque in a starter/generator A controller for a starter/generator used with an aircraft engine, includes means for monitoring field return current in a generator field winding; means for monitoring generator voltage; and microprocessor control means for adjusting generator field curr... | 08/22/2000 |
| 6025691 | Synchronous motor control system and method of controlling synchronous motor A synchronous motor control system which can freely regulate n-phase electric currents in a synchronous motor to control the characteristics of the synchronous motor. The synchronous motor control system can enhance the output torque per unit weight of a ... | 02/15/2000 |
| 5986417 | Sensorless universal motor speed controller A circuit and method for controlling the speed of a universal motor driven by an AC source is disclosed. The method includes the steps of measuring a value of a temporal property of a current through the motor and determining a speed of rotation of the un... | 11/16/1999 |
| 5852349 | Driver circuit apparatus for driving a three-phase motor with a single magneto-sensitive device An integrated circuit for driving a three-phase motor in response to a single signal of the three-phase signals to be applied to stator coils of the motor. The circuit comprises a first amplifier for amplifying the single signal on the basis of a first in... | 12/22/1998 |
| 5847535 | Active electronic damping for step motor Apparatus for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, without the use of an accelerometer or other external feedback device, includes a circuit for detecting respective instantaneous terminal vol... | 12/08/1998 |
| 5847524 | Constant speed control for a motor A motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating assembly to rotate. A position sensing circuit provides a p... | 12/08/1998 |
| 5847534 | Control system for electric vehicle The control system is constructed so that an inverter output frequency command is increased/decreased based on a frequency-to-time rate-of-change command, and the frequency-to-time rate-of-change command is controlled with a current control system. Furthe... | 12/08/1998 |
| 5838132 | Stepper-motor control method A device for outputting a suitable rotation torque relative to a load torque or actual torque exerted on a stepper-motor when the stepper-motor is used as a drive of an image processing device. The output torque of the stepper-motor depends on a supply cu... | 11/17/1998 |
| 5831405 | High precision fan control/alarm circuit A motor speed control circuit includes a temperature sensor providing a first voltage output which is proportional to the temperature and a control voltage generator having an internal voltage reference receiving the first output as an input. The control ... | 11/03/1998 |
| 5821725 | Electric current compensation circuit for brushless motors for reducing ripples in output torques during phase change An electric current compensation circuit for use with a multiple-phase burshless motor to reduce ripples in the output torque is disclosed. It contains a plurality of electric current compensation loops each for a respective phase winding and each of the ... | 10/13/1998 |
| 5821714 | Improvements in and relating to motors A commutation control strategy for eliminating torque ripple and noise from a brushless motor which has a plurality of motor phases connected in a bridge, each phase having a top switching device provided between a phase winding and a positive voltage sup... | 10/13/1998 |
| 5818187 | Motor and control for windshield wiper system The invention concerns an improved system for windshield wipers in vehicles. An induction motor is used, in which speed is accurately controlled by controlling frequency of power supplied to the motor. The induction motor may be of the consequent-pole typ... | 10/06/1998 |
| 5818180 | Voice coil motor feedback control circuit A circuit for driving a voice coil motor used to position the heads of a disk drive is disclosed. The circuit consists of a an H-bridge circuit, a controller, and a feedback loop. The feedback loop prevents the BEMF from driving a voltage on the voice coi... | 10/06/1998 |
| 5801505 | Disk drive stiction release system A disk drive including firmware for overcoming stiction and breaking free the heads of a disk drive which may adhere to the disk surface when the disk is at rest. Upon start-up of the disk drive, if stiction at the head/disk interface occurs, the voltage ... | 09/01/1998 |
| 5793180 | Fully digital drive system for brushless motor with voltage or current profiles read from a digital memory Pre-defined driving profiles for the distinct phase-windings of an electronically controlled brushless motor are continuously reconstructed for each switching phase and forced in the form of a drive current or voltage on the respective windings, in synchr... | 08/11/1998 |
| 5793170 | Motor drive circuit In a motor drive circuit, the collector-emitter paths of two npn-type transistors are connected in series between a power line and ground, and the junction between the two transistors is connected to a motor coil. A control circuit feeds a control current... | 08/11/1998 |
| 5786681 | Active phase coil inductance sensing A method and circuit are disclosed for commutating a conduction cycle of a motor phase of a switched reluctance motor having a rotor portion thereof. The circuit includes a first switching device and a second switching device connected in series with a ph... | 07/28/1998 |
| 5783924 | Drive system comprising a motor, control means for controlling the motor, apparatus comprising the drive system, and method of controlling the motor The drive system (210) comprises an electronically commutated motor (220) having three windings (225, 226 and 227). The motor (220) is energized by an energizing circuit (270). The energizing means (270) is controlled by three Hall elements (241, 242 and ... | 07/21/1998 |
| 5773944 | Electric machine control system including a torque smoothing device An electric machine control system includes a torque smoothing device including a torque monitoring device connected to the electric machine and supplying torque signals. A smoothing processor receives the torque signals and receives at least one torque r... | 06/30/1998 |
| 5767654 | Apparatus and method for detecting motor position in PWM operation of a polyphase DC motor A pulse width modulated (PWM) motor drive with back EMF monitoring of the floating phase of a polyphase motor is arranged so that zero crossings of the back EMF can be read without interference by PWM switching. A measure is taken of an interval between t... | 06/16/1998 |
| 5761375 | Brushless motor speed detection device A delay signal rising after the passage of a predetermined time from the rising or falling of a position signal is formed by means of a delay circuit. While an offset circuit is used for sequentially monitoring the size relation between an induced electro... | 06/02/1998 |
| 5757162 | Method and apparatus for operating an electric induction motor with a long and lossy extension cord An alternating current induction motor having a multitapped RUN winding and including a controller which automatically determines an instant tap selection in response to changes in applied a.c. electric power voltage level appearing immediately at the mot... | 05/26/1998 |
| 5758014 | Electric vehicle traction control system and method A system and method that may be implemented in a power inverter or controller, for example, that uses the speed of a rotor to control the torque output of a motor of an electric vehicle. A rotor encoder coupled to the rotor of the motor provides encoder s... | 05/26/1998 |
| 5751132 | Electric motor monitoring circuit An electric motor monitoring circuit apparatus for an electric motor has a three phase electric motor having an electric motor starter circuit. An insulation monitoring circuit is coupled to the electric motor and monitors insulation leakage of the electr... | 05/12/1998 |
| 5744921 | Control circuit for five-phase brushless DC motor A control system (100) for a five-phase brushless DC motor (102) including a stator having five windings and a rotor (116) mounted for rotation relative to the windings (114). The windings (114) are adapted to be electronically commutated in response to t... | 04/28/1998 |
| 5739664 | Induction motor drive controller An induction motor control system for electric vehicles having a DC power supply, an inverter, and an induction motor, includes a current control mechanism having a flux controller. The flux controller reduces the stator flux to improve the torque output ... | 04/14/1998 |
| 5717305 | Method and apparatus for starting an electric motor A method and apparatus for controlling an AC motor are described wherein a frequency generator is configured to generate a signal representative of the stator electrical frequency and to estimate the rotor electrical frequency of the motor during operatio... | 02/10/1998 |
| 5703458 | Capacitor-type motor speed controller A quiet motor speed controller is disclosed which varies an amplitude of an AC voltage signal provided from an AC source to drive an AC motor. The controller includes a first impedance in series connection between the source and the motor. A second impeda... | 12/30/1997 |
| 5698960 | Motor servo system A motor servo system includes a microcomputer which obtains FG period data in response to an FG signal outputted from a capstan motor, and calculates rotation unevenness associate data D1 by totalizing (a hundred) absolute values of differences between ea... | 12/16/1997 |
| 5691611 | Abnormality detecting system and abnormality detecting method for rotor position detection means, and motor control system An abnormality detecting system, for detecting an abnormality in a rotor position detector for detecting a magnetic pole position of a motor, includes a speed calculator for calculating the speed of the motor, and an abnormality detector for detecting an ... | 11/25/1997 |
