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| Number | Title | Issue Date |
| 7477032 | Compressor and a driving method thereof A compressor having a sensorless motor and a driving method thereof. The compressor includes a sensorless motor having a rotation shaft connected to a rotator, a piston for performing a compression stroke and an intake stroke between a top dead center and a bottom d... | 01/13/2009 |
| 7368886 | Method of testing motor torque integrity in a hybrid electric vehicle A method of testing an electric motor that is adapted to provide a desired electric motor output torque to a vehicle powertrain system comprising an engine and the electric motor which are operatively and selectively coupled to a transmission. The method includes th... | 05/06/2008 |
| 7342379 | Sensorless control systems and methods for permanent magnet rotating machines Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator... | 03/11/2008 |
| 7342366 | Controller for brushless motor The controller for a brushless motor controls motor current by executing updates of applied voltage to a coil in accordance with rotational position of a rotor, the target current, and the actual current flowing through the coil. The updates of applied voltage to th... | 03/11/2008 |
| 7339337 | Power plant A propeller is driven by an electric motor through a mechanical drive train. The output torque of the motor to the drive train is controlled by a controller with respect to a normal torque reference signal and an emergency torque reference signal. When a measured de... | 03/04/2008 |
| 7333413 | Optical storage device rotation speed control apparatus and method A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first pulse of a first voltage and a second pulse of a second voltage are sen... | 02/19/2008 |
| 7327587 | System and method for power conversion An ac-ac power converter system is provided for supplying power to an electrical load. The ac-ac power converter system provides an output voltage having variable amplitude and/or frequency. The ac-ac power converter system includes a boost inductor for applying a d... | 02/05/2008 |
| 7298104 | System for electrically regulating the movement transmission device for a motor vehicle The invention concerns a system for electrically regulating a power transmission device between the heat engine and a pair of electrical machines and the drive wheels of a motor vehicle, the heat engine being connected to the two electrical machines via a mechanical... | 11/20/2007 |
| 7294988 | Synchronous motor drive unit and a driving method thereof A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its star... | 11/13/2007 |
| 7272479 | Electrically operated power steering controller and adjusting method of driving electric current offset in this controller The invention proposes an electrically operated power steering controller for inputting a driving electric current offset value of higher accuracy and being able to make an offset correction of a driving electric current by using this driving electric current offset... | 09/18/2007 |
| 7265515 | Starter for a line start electric motor The invention concerns a starter for a line start electric motor having at least one main winding (4) and at least one start winding (12) and which start winding is connected in series with a run capacitor (14) with which a start capacitor (1... | 09/04/2007 |
| 7253581 | Data storage device, motor control device, and motor control method Embodiments of the invention provide a way to accurately detect the position of a spindle motor. In a spindle motor startup process according to one embodiment, a parameter setup section acquires from a parameter table a sense time value corresponding to an input vo... | 08/07/2007 |
| 7233123 | Electrical machine rotor position identification A method of and system for identifying the position of magnetic poles of a rotor of a multi-phase electrical machine relative to a stator of that machine is disclosed. The method includes the steps of applying a voltage pulse to stator windings of each phase, sensin... | 06/19/2007 |
| 7208893 | Motor driving control device to be driven at interval of constant time A motor driving control device includes a motor, a switch unit that controls driving of the motor, a current detection resistor that outputs a detection voltage indicating a current of the motor, a comparator that compares the detection voltage with a target current... | 04/24/2007 |
| 7205737 | Systems and methods of monitoring a motor load Systems and methods of detecting an overload condition. In one embodiment, a method of monitoring a load of a DC motor includes intermittently de-energizing the motor; monitoring a first voltage; and measuring a first interval of time between a starting time and an ... | 04/17/2007 |
| 7193387 | System and method for motor speed estimation using hybrid model reference adaptive system Motor drives, motor speed controllers, motor speed estimation systems, and methods are presented for controlling motor startup speed and for estimating motor speed during startup, in which a speed estimate controller provides a rotor speed estimate based on a first ... | 03/20/2007 |
| 7176659 | Vehicle electrical power supply system for supplying power to a high power load The present invention provides an electrical power supply system for an automotive vehicle with high reliability and small size in which an adequate power is supplied to both a high power load like a blower motor and a conventional load like a battery by using a con... | 02/13/2007 |
| 7166978 | Motor temperature sensor system and method to determine motor performance An electric motor system includes an electric motor, a temperature sensor mounted therein capable of measuring a local temperature and generating a temperature related signal, and a processor configured to calculate an actual temperature of a rotor magnet from the t... | 01/23/2007 |
| 7164238 | Energy savings device and method for a resistive and/or an inductive load and/or a capacitive load An energy savings device for an inductive, a resistive or a capacitive load, such as a fluorescent light fixture having a magnetic ballast or an electronic ballast, which is powered by an AC voltage waveform. The energy savings device includes a setting unit for set... | 01/16/2007 |
| 7161314 | Motor control apparatus having current supply phase correction In a motor-driven shift position switching device, when the difference between a target position and the rotation position of a rotor has become smaller than a prescribed value in a motor feedback control, a transition is made to a deceleration control. A phase lead... | 01/09/2007 |
| 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 |
| 7140460 | Vehicle driving force control apparatus A driving force control apparatus is provided for a vehicle capable of preventing a shock from being generated by disengaging a clutch disposed between a subordinate drive source and subordinate drive wheels during vehicle travel. When a transition determination is ... | 11/28/2006 |
| 7114527 | Method for operating a drive assembly of a loom and shedding machine comprising divided drive technology A method achieves highly constant energy in the operation of a loom and shedding machine with separated drive technology, and ensures the run-up in one weft insertion for the loom and if necessary also for the shedding machine. The control arrangement controlling th... | 10/03/2006 |
| 7116073 | Methods and apparatus for controlling a motor/generator Methods and apparatus provide for: commutating windings of a polyphase machine such that electromagnetic fields of stator and rotor phases of the polyphase machine produce at least one of motoring and generating torque; providing a first rotor excitation voltage hav... | 10/03/2006 |
| 7091681 | Drive circuit for brushless DC fan motor A drive circuit for a brushless DC fan motor for rotating a rotor (permanent magnet) by a rotating magnetic field produced by turning on/off the flow of electric current to field coils by a signal to control terminals of switch elements in which switch sections are ... | 08/15/2006 |
| 7088068 | Sensorless motor driving apparatus and driving method addressing prevention of backward rotation The sensorless motor driving apparatus according to the invention may include: a timing generation circuit generating a timing signal at intervals T; a driving signal generation circuit receiving the timing signal and generating, at the intervals T, pulse signals, t... | 08/08/2006 |
| 7075195 | Electrical safety lockout mechanism for power tools and other hazardous machinery An improved electrical lockout mechanism includes a first connection means to a power source, and a second connection means to a power input terminal of the machine being protected. The machine includes a manually-operated ON/OFF switch. A switching element, which i... | 07/11/2006 |
| 7071640 | Rotation drive control circuit of multiphases direct current motor and the start-up method thereof In start-up control of a motor in which currents are caused to flow through any two of three phase coils to detect the polarity of a voltage induced in each de-energized phase, thereby determining the corresponding energized phase at start-up thereof, based on the p... | 07/04/2006 |
| 7023158 | Motor control apparatus A motor control apparatus capable of easily and reliably determining the completion of starting of a synchronous motor and not requiring an arithmetic unit having high processing ability for the determination. When an operation command including a predetermined targ... | 04/04/2006 |
| 7015664 | Motor drive control A drive system for a three phase brushless motor uses an algorithm for position sensing which measures the inductance in the motor phases and determines the position from the measured inductances. In order to reduce acoustic noise, the inductances are measured durin... | 03/21/2006 |
| 7005814 | Motor control apparatus having current supply phase correction In a motor-driven shift position switching device, when the difference between a target position and the rotation position of a rotor has become smaller than a prescribed value in a motor feedback control, a transition is made to a deceleration control. A phase lead... | 02/28/2006 |
| 6987373 | System and method for starting pump A starting system for a pump includes a driving motor, an electric source, a selector switch, a starter sensor, a temperature sensor and a control unit. The selector switch is located between the driving motor and the electric source for reversing polarity of the el... | 01/17/2006 |
| 6979979 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 12/27/2005 |
| 6979972 | Method and apparatus for detecting a stalled stepper motor A method for detecting a state of an electric motor includes: energizing the motor with electrical power such that an associated current applied to the electric motor rises over time toward a reference level; determining an amount of time that elapses between when t... | 12/27/2005 |
| 6962171 | Drive arrangement for a weaving loom and shedding machine A drive arrangement is constructed for permitting the separate operation of a weaving machine and a shed forming machine. The drive arrangement compensates any r.p.m. variations of the weaving machine drive and of the shed forming machine relative to the drive shaft... | 11/08/2005 |
| 6917178 | Electric actuator system In determining a starting point of a motor of an electric actuator during its initialization procedure, when a rotation angle sensor detects pulse signals in a certain initialization pattern, power supply to the motor is stopped by the control of a motor drive circu... | 07/12/2005 |
| 6909263 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 06/21/2005 |
| 6873125 | Motor driving apparatus and motor using the same A motor driving apparatus includes a pulse-width modulator and a PWM frequency switch for switching a carrier frequency of the modulator. The PWM frequency switch changes a carrier frequency in a start-up period of the motor to another frequency when the motor enter... | 03/29/2005 |
| 6856108 | Switched reluctance motor and initial activating method thereof Switched reluctance motor and an initial activating method thereof in which an aligning pulse is applied to a stator to make a rotor wait at a normal torque generating region to be driven, preventing the rotor from rotating in a direction reverse to a target rotatin... | 02/15/2005 |
| 6774592 | Method and system for controlling a permanent magnet machine Method and system for controlling a permanent magnet machine are provided. The method provides a sensor assembly for sensing rotor sector position relative to a plurality of angular sectors. The method allows starting the machine in a brushless direct current mode o... | 08/10/2004 |