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| Number | Title | Issue Date |
| 8159163 | Phase current estimation device of motor and magnetic pole position estimation device of motor A phase current estimation device of a motor includes: an inverter which uses a pulse width modulation signal to sequentially commutate an electric flow to a motor of a three-phase alternating current; a pulse width modulation signal generation unit generating the p... | 04/17/2012 |
| 8098033 | Motor drive circuit A motor drive circuit comprising: a triangle wave generation circuit configured to charge/discharge a capacitor with a charging/discharging current having a current amount corresponding to an amplitude control voltage for controlling an amplitude of an oscillation v... | 01/17/2012 |
| 8054020 | Electric motor An electric motor has a DC link circuit (30, 32), a permanent-magnet rotor (104), and a control circuit having a full bridge (114). A program-controlled calculation arrangement (80) is configured to supply the semiconductor switches of a ... | 11/08/2011 |
| 8013552 | Systems and methods for controlling a DC motor Various systems and methods for controlling DC motors are disclosed herein. For example, one method provides for controlling a polyphase, brushless DC motor. The method includes providing a DC motor that has a plurality of phases. Such a DC motor operates by inducin... | 09/06/2011 |
| 7990090 | Method for determining the position of a rotor of a synchronous machine having at least one excitation winding A method for determining the position at rest of a rotor of a machine having at least one excitation winding. The invention provides a technique for detecting the position of the rotor at rest, from information contained in the voltages produced at the terminals of ... | 08/02/2011 |
| 7884563 | Motor and drive control system thereof Provided is a motor having a magnetic polar unit in which a permanent magnetic polar array having arranged therein alternately a plurality of permanent magnetic polar elements in alternate opposite poles is made to face a plurality of electromagnetic coil arrays alt... | 02/08/2011 |
| 7839102 | System and process for utilizing back electromotive force in disk drives A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utiliz... | 11/23/2010 |
| 7800322 | Isolation circuit for DC power sources The electrical isolation circuit of the present disclosure includes a switch coupled between the DC power source and the electrical application and a comparator for controlling the switch by receiving inputs from the DC power source and the electrical application. T... | 09/21/2010 |
| 7635959 | VSD control A compressor is powered by a motor which is, in turn, powered by a variable speed drive (VSD). The switching frequency and voltage/frequency relationship of the VSD may be adjusted dynamically to maximize efficiency. ... | 12/22/2009 |
| 7633249 | Polyphase current supplying circuit and driving apparatus This invention is to reduce a voltage across a smoothing capacitor in a single-phase capacitorless inverter. A smoothing circuit (15) has a smoothing capacitor (C) connected between a pair of power supply lines (L1, L2). A diode (Ds) has its ano... | 12/15/2009 |
| 7629756 | Method and apparatus for controlling asynchronous motors Methods and apparatus are provided for controlling first and second motors. A controller includes a processor supplying a control signal for driving the motors and a logic circuit coupled to the processor. The processor produces a first trigger coordinated with the ... | 12/08/2009 |
| 7612510 | Pump controller system and method A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when s... | 11/03/2009 |
| 7602131 | Voice coil motor control system and method using pulse width modulation A system includes a current control module that supplies current to a voice coil motor during a first period to rotate an actuator arm in a first rotational direction, that discharges the current from the voice coil motor after the first period, and that generates a... | 10/13/2009 |
| 7579794 | Fan system with hysteresis character and method thereof A fan system includes a fan, a hysteresis circuit including a temperature sensor, a first operational amplifier having a negative input end coupled to the temperature sensor, and a second operational amplifier having a negative input end coupled to an output end of ... | 08/25/2009 |
| 7573218 | Sensorless driving method for brushless DC motor A sensorless driving method for a brushless DC motor is provided. The time for the motor to rotate an electrical angle 60° is obtained by alternatively counting the occurrences of zero crossings with two counters and comparing the counted values, and the motor is d... | 08/11/2009 |
| 7570000 | Control drive circuit for electric power tool In a control drive circuit for an electric power tool, a bridge-structured motor, which has a bridge structure and includes switching elements and a motor body, is connected to a power supply unit without any mechanical contacts, and an electric power is supplied to... | 08/04/2009 |
| 7560883 | System and process for utilizing back electromotive force in disk drives A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utiliz... | 07/14/2009 |
| 7545110 | Motor drive control A drive system for a multi-phase brushless motor comprises a single current sensor drive circuit, including switch means, switchable between a plurality of states. A controller is arranged to provide pulse width modulated drive signals to control the switch means so... | 06/09/2009 |
| 7482769 | Control apparatus for electric motor and abnormality detection method for electric motor control A high-level ECU generates a torque command value T1 according to an output request to an electric motor. A low-level ECU calculates a torque command value T2 for correcting the original torque command value T1 according to the operational state... | 01/27/2009 |
| 7466095 | Voice coil motor control system and method using pulse width modulation A system and method for controlling an actuator includes a control module that communicates with a plurality of switching devices to generate current through a voice coil motor during a first time period so that an actuator arm rotates in a first rotational directio... | 12/16/2008 |
| 7444070 | Fan motor with digital controller for applying substantially constant driving current An improved fan arrangement features a radial or diagonal fan (370) with which a direct current motor (32) is associated as its drive motor, further comprising a digital control element (23, 24) which executes a program, for controlling the curr... | 10/28/2008 |
| 7443118 | Method and device for triggering an electric motor The invention relates to a method for triggering an electric motor, in particular, an electrically conducting motor with a rotor, where an emergency run is performed as a function of the presence of at least one erroneous sensor signal. The invention also relates to... | 10/28/2008 |
| 7436138 | Methods and systems for emulating an induction motor utilizing an electronically commutated motor A method for emulating induction motor operation using an electronically commutated motor (ECM) is described herein. The method includes receiving, at the ECM, a desired operating torque, accessing induction motor operating characteristics stored within the ECM, and... | 10/14/2008 |
| 7429840 | Control of an electrical reluctance machine An electrical machine having stator (30) and rotor (31) is disclosed. The motor has field windings (F) and armature windings (A) energized by a suitable power electronic controller (401). A controller (400) sends signals to the power elec... | 09/30/2008 |
| 7425808 | Vehicle drive system and vehicle provided with the same A rotor is provided with slits each of which serves as a flux barrier blocking a magnetic flux. A direction shown by an arrow is a forward direction along which the rotor rotates when a vehicle moves forward. Each of the slits has a width tapering down from a traili... | 09/16/2008 |
| 7421193 | Digital motor control system and method A digital motor control system utilizes time duration electric pulses generated by digital logic to control the motor speed and direction of rotation of a D.C. or A.C. motor. The digital logic produces width modulated pulses that can be connected to large or small e... | 09/02/2008 |
| 7420343 | Current limiting DC motor starter circuit A current limiting DC motor starter employing a closed loop current measurement to provide precise current control that adapts to changing motor conditions, integrated with a solid state reversing motor starter. The motor starter further includes a calibrated overcu... | 09/02/2008 |
| 7411369 | Phase current detection method, inverter control method, motor control method and apparatus for carrying out these methods Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage ... | 08/12/2008 |
| 7408311 | Protection device for electric motor driving devices and corresponding driving device A protection device protects a driving device of an electric motor with at least three phases and at least three windings and the driving device comprises a power stage suitable for driving directly said at least three windings. The driving device is suitable for ac... | 08/05/2008 |
| 7408312 | Control device for permanent magnet synchronous motor A control device for a permanent magnet synchronous motor includes: an inverter 9 for converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motor 14 with the AC voltage; a speed controller 22 fo... | 08/05/2008 |
| 7408322 | Device for determining constant of rotating machine A device for determining a constant of a rotating machine includes: a test number selector outputting a test number n, selected from 1 to N (N≧2), and outputting a phase signal q determined by a predetermined condition that is previously set based on the test numb... | 08/05/2008 |
| 7405916 | Control apparatus of semiconductor switch A control apparatus includes a plurality of load circuits, a power supply wiring line that connects the load circuits to a DC power supply in common, and a counter electromotive force detecting unit that detects counter electromotive force generated on the power sup... | 07/29/2008 |
| 7400102 | Method for controlling a polyphase voltage inverter The present invention relates to a method for controlling a polyphase voltage inverter the inverter being designed to control a load in terms of pulse width modulation and to be connected upstream to a voltage source via a DC bus and downstream to an electrical load... | 07/15/2008 |
| 7400101 | Method for detecting rotor angle of DC brushless motor and controller of DC brushless motor A method and an apparatus accurately detect a rotor angle of a DC brushless motor by using a first-order difference of a detected value of a phase current. A periodic signal causing the total sum of output voltages in three control cycles to become zero is superpose... | 07/15/2008 |
| 7400107 | Surgical machine and method for operating a surgical machine To improve a surgical machine with an electric motor comprising a rotor and a plurality of motor windings, and with a motor controller for controlling and/or regulating the electric motor so that, in particular, the efficiency of the electric motor can be optimized ... | 07/15/2008 |
| 7397207 | Electric supercharger for vehicle The electric supercharger includes a vehicle connector, an impulse signal generator empowered by a power source, and a signal amplifier. The vehicle connector has a positive terminal and a negative terminal for electrically connecting to an electrical source of said... | 07/08/2008 |
| 7398012 | Method for powering mining equipment Certain exemplary embodiments can include a static DC electric drive system for mining equipment. The drive system can include: an active front end adapted to receive an AC voltage and output a substantially constant DC voltage; and a DC chopper coupled to the activ... | 07/08/2008 |
| 7388345 | Rotor position detection in an electrical machine An electrical machine is controlled with a combination of a physical rotor position transducer and a software position detection algorithm. The physical transducer has a reduced number of sensors, so that it will only give accurate information at high speeds. The so... | 06/17/2008 |
| 7385364 | System and method for detecting back electromotive force with automatic pole calibration A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in ... | 06/10/2008 |
| 7385369 | AC fan motor driving circuit having capability of monitoring the rotation rate and status of the AC fan motor A driving circuit has a driving circuit module, a rotation rate detecting module and a rotation status detecting module. The driving circuit module is used to drive an AC fan motor and has at least a driving IC having two controlling outputs and a rotation status de... | 06/10/2008 |
