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| Number | Title | Issue Date |
| 7362071 | Rotation control device, rotation control method and construction machine In an electric rotary excavator (construction machine) 1, when earth pressure acts on a rotary body 4 in an opposite direction to an instructed direction of a lever, a control-system changing means 150 of a rotation control device 100 inc... | 04/22/2008 |
| 7330011 | Motor driving apparatus A motor driving apparatus includes an inverter circuit for converting an output of a rectifier circuit connected to a single-phase AC power supply into a driving voltage, and outputting the driving voltage to a brushless motor, and an inverter control unit for contr... | 02/12/2008 |
| 7282875 | System and method for electric motor control An electric motor control system includes a housing and a motor disposed within the housing. The electric motor control system also includes an actuator operatively coupled to the motor and configured to operate in response to an operation of the motor. The electric... | 10/16/2007 |
| 7274161 | Motor driving apparatus A Motor driving apparatus adjusts activation start timing of high-side activation control signals UU, VU, WU and the low-side activation control signals UL, VL, and WL with a state determination signal SJ in an activation controller 40, in the period from sta... | 09/25/2007 |
| 7245225 | Failure monitor for motor drive control system A failure monitor designed to monitor a failure in operation of a motor drive control system. The system works to drive a motor-driven member through an output shaft and includes an angular position sensor for determining an angular position of the output shaft for ... | 07/17/2007 |
| 7190138 | Failure monitor for motor drive control system A failure monitor designed to monitor a failure in operation of a motor drive control system. The system works to drive a motor-driven member through an output shaft and an electric motor and includes an output shaft angular position sensor for determining an angula... | 03/13/2007 |
| 7170243 | Drive method for brushless motor and drive control apparatus therefor A drive method for a brushless motor and a drive control apparatus therefor, in which control parameters are calculated by revolution number control means or motor current control means in accordance with the deviation between a target value and an actual value, a m... | 01/30/2007 |
| 7138772 | Electrically movable vehicle and control program for driving electrically movable vehicle The invention provides an electrically movable vehicle drivable by a simplified mode of control and a control program for driving the vehicle. A normalized value Y′ representing translation motion and a normalized value X′ representing turning motion are fed fro... | 11/21/2006 |
| 7103498 | Method for determining the angular position of a rotor According to the invention, in a method for determining the angular position of a rotor, a reference voltage is set in a calibration phase, such that when the rotor, rotating at a calibration speed, passes through a particular detection position, said voltage is the... | 09/05/2006 |
| 7067999 | Rotation control device of working machine In a neutral range preset, there are set a zone for stopping and holding a rotating body only by a mechanical brake, a zone for holding the body only by performing position holding control, and a zone for simultaneously exerting both effects, i.e., the effect of the... | 06/27/2006 |
| 6940235 | Method and apparatus for driving a brushless DC motor A drive circuit for a brushless DC motor includes a switch constructed and arranged to drive the motor with a pulse signal responsive to a control signal, and control circuitry coupled to the switch and constructed and arranged to generate the control signal respons... | 09/06/2005 |
| 6731086 | Motor driving device In a motor driving device that drives a motor by energizing a coil of a first phase and a coil of a second phase provided in the motor in one direction alternately, which phase to energize is switched according to a back electromotive force appearing in the coil of ... | 05/04/2004 |
| 6636012 | Stator and rotor resistance identifier using high frequency injection A method and apparatus for generating stator and rotor resistance estimate, the method including the steps of providing high frequency injection voltage signals to a three phase motor, rotating three phase feedback current therefrom, converting the feedba... | 10/21/2003 |
| 6597148 | Method for controlling an electrical machine and an inverter A method for controlling an electrical machine while it is connected to an inverter comprising phase-specific switching components generating an output voltage, an optimum switching table arranged to select a switching combination for the switching compon... | 07/22/2003 |
| 6163137 | Rotary induction machine having control of secondary winding impedance A rotary induction machine in which operating characteristics of the machine are controlled by adding impedance elements to the rotor windings in which the impedance elements are stationary and connected to the rotor windings by a rotary transformer.... | 12/19/2000 |
| 5949208 | Circuit and method for controlling a DC motor A circuit and method for controlling a rotating or oscillating element of a DC motor, including a positional deviation correction signal generator in addition to a position sensor which detects an amount of rotation or oscillation and position of the rota... | 09/07/1999 |
| 5457374 | Motor controller for operating an inverter in current-controlled and voltage-controlled modes A motor controller for brushless motors operates an inverter in a current-controlled mode for low motor speeds and in a voltage-controlled mode for high motor speeds. By switching from the current-controlled mode to the voltage-controlled mode at higher s... | 10/10/1995 |
| 5410234 | Motor drive control apparatus A motor drive control apparatus having an electrical power amplifier for supplying an electrical power to a motor, and a current control loop and speed control loop for controlling the drive of the motor, which includes a current feedforward component cal... | 04/25/1995 |
| 5196778 | Control apparatus suitable for use in induction motor A gain change-over switch according to the present invention serves to change over at least one of a current loop gain and a velocity loop gain to a value of the gain greater than that in other modes, in the case where a rotational-position control mode i... | 03/23/1993 |
| 5191273 | Operating control device and method for wound-rotor induction machine This invention proposes an operating control device and method for a winding type induction machine that ensures that the harmonic components naturally present in the primary voltage of a winding type induction machine, do not correspond to the antiresona... | 03/02/1993 |
| 5187420 | Method of calculating motor control voltage and motor control device using the method A motor control device carries cut feedback control of a motor such that the rotational speed of the motor is equal to the command speed. A control voltage is first calculated as the sum of a first constant times the difference between the command speed a... | 02/16/1993 |
| 4672291 | Variable-speed electrical machine This invention pertains to an electrical machine whose excitation is coordinated to the respective rpm in such a fashion that a desired characteristic of induced voltage or delivered output is produced. For that purpose at least one portion of the winding... | 06/09/1987 |
| 4450395 | System for controlling synchronous motors Control system for driving a synchronous motor at a speed greater than a rated speed with a rotational speed detector for the rotor mounted on the motor, rotational position detector for detecting the rotational position of the field pole of the motor, an... | 05/22/1984 |
| 4415846 | Wound rotor motor apparatus A wound rotor motor apparatus includes an energy recovery circuit having a rectifier connecting the rotor circuit to a gated inverter having an input filter for return of rotor power to the three-phase power supply system. A voltage chopper circuit connec... | 11/15/1983 |
| 4382217 | Starting control circuit for an A.C. motor A starting control circuit is provided for an alternating current motor having a run winding and a start winding and a mechanical rotational output. The motor is powered by an alternating current source. A reference oscillator produces pulses having a ref... | 05/03/1983 |
| 3969659 | Alternating current motor system A system including an alternating current electric motor of the wound rotor type wherein the speed of the motor is controlled and its starting current is limited, is disclosed. A plurality of phase regulated SCR devices control the amount of resistance in... | 07/13/1976 |
