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| Number | Title | Issue Date |
| 7960927 | Electric motor control device and drive unit An electric motor control device includes a power supply unit that supplies power to a three-phase electric motor; a three-phase current sensor that individually detects three respective phase currents of the three-phase electric motor; a summing unit that calculate... | 06/14/2011 |
| 7501782 | Method and apparatus for controlling a magnetic bearing device A method and a controller for controlling a magnetic bearing device, in which a rotor is suspended for rotation around a shaft, are disclosed. Sensor signals are transformed to yield tilt displacement signals (Sθx, Sθy) which correspond to tilting displacements of... | 03/10/2009 |
| 7443132 | Motor control device and method A motor control device for controlling rotation of a motor by controlling a driving voltage applied to the motor is provided. The device includes a driving voltage control unit configured to control the driving voltage, and a detecting unit configured to detect rota... | 10/28/2008 |
| 7391174 | Brushless DC motor control apparatus and control method thereof The invention relates to a brushless DC motor control apparatus controlling the number of revolutions of a brushless DC motor having a rotor with n poles (where n is a natural number) that rotates due to a supply current with m phases (where m is a natural number) s... | 06/24/2008 |
| 7317293 | Displacement control system for a vehicle axle Provided is a motor control circuit in which the circuit structure is not complicated, which has a favorable response to the phase difference signal, and in which the signal variation caused by heat is small. This rotation control circuit of a motor includes: a PWM ... | 01/08/2008 |
| 7291999 | System and method for diagnosing a controller in a limited rotation motor system A method of analyzing a limited rotation motor system is disclosed. The method includes the step of providing a motor control frequency domain signal that is representative of a frequency domain representation of the motor control signal responsive to a first digita... | 11/06/2007 |
| 7259533 | Method of controlling motor drive speed Disclosed is a method of controlling drive speed of a motor operating in overload conditions. The method includes the steps of: driving the motor at a predetermined reference speed; detecting phase voltage and phase current applied to the motor; determining whether ... | 08/21/2007 |
| 7183738 | Motor control device A speed control means 7 for outputting a drive command signal for a motor 1 to make the speed of the motor 1 conform to the speed command signal based on a signal indicating the difference between the speed command signal and the detected speed ... | 02/27/2007 |
| 7181296 | Method of adaptive interactive learning control and a lithographic manufacturing process and apparatus employing such a method By applying time-frequency analysis to a given standard iterative learning control or ILC an adaptive filter for the learned feed-forward loop is designed. This time varying filter varies according to the momentary frequency content of the error signal and allows to... | 02/20/2007 |
| 7170251 | System and method for diagnosing a controller in a limited rotation motor system A diagnostic system is disclosed for analyzing a limited rotation motor system. The diagnostic system includes a first transform unit, a second transform unit, a closed loop frequency response unit, and a diagnostic system. The first transform unit is for receiving ... | 01/30/2007 |
| 7154244 | Steering apparatus Steering apparatus includes at least one motor for generating a steering assisting force in a direction to steer a steerable wheel, two drive circuits having respective switching elements for PWM-controlling the motor, and a controller for differentiating, between t... | 12/26/2006 |
| 7119520 | Energy storage flywheel test control system A system and method for removing energy from the rotating group in an energy storage flywheel system during flywheel system testing includes one or more sensors is operable to sense operational parameters of the energy storage flywheel and to supply a sensor signals... | 10/10/2006 |
| 7084603 | Motor control device A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency wave setter. An inverter applies a current to the motor. A current con... | 08/01/2006 |
| 7049778 | Inverter control apparatus and inverter control method An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of m... | 05/23/2006 |
| 6943522 | Servo controller A servo controller includes a mechanical characteristic compensation unit for attenuating components having predetermined frequencies and corresponding to characteristics of a machine, which are included in a position instruction signal corrected by a finite impulse... | 09/13/2005 |
| 6927550 | Device and method used to automatically compensate for synchronous disturbance To eliminate unwanted vibrations caused by synchronous disturbances, such as synchronous disturbances caused by an imbalance, for example, the invention proposes a compensation device for closed loop compensation of a synchronous disturbance in a rotating machine co... | 08/09/2005 |
| 6912426 | Method for determining time constants of a reference model in a cascade controlling circuit A method for determining at least one time constant of a reference model, which is designed as a 2nd order time-delay element of a machine. The method includes detecting an oscillation frequency of an undamped machine oscillation and determining an optimized value o... | 06/28/2005 |
| 6809449 | Controlled magnetic bearing apparatus A controlled magnetic bearing apparatus which generates a control signal based on a sensor signal from a displacement sensor for detecting a radial displacement of a rotor to suppress whirling of the rotor due to an external force synchronized with a rotational move... | 10/26/2004 |
| 6746211 | Operation control method resonance frequency of reciprocating compressor An operation control method of a reciprocating compressor is disclosed in which, in case that a motor is overloaded, an operation frequency is increased to render magnetic fluxes of a magnet and an input current are mutually offset, so that a reciprocating compresso... | 06/08/2004 |
| 6614198 | Method and apparatus for controlling release of hoisting motor brake in hoisting apparatus A method and an apparatus for controlling release of a hoisting motor brake in a hoisting apparatus, where electricity is used as the driving force and a squirrel cage motor as the hoisting motor for hoisting or lowering a load attached to a hoisting memb... | 09/02/2003 |
| 6259221 | Method and apparatus for tuning motion control system parameters A method and apparatus for tuning control loop parameters in a motion control system, is provided. In one embodiment, tuning of the proportional and integral gains of a servocontroller's velocity loop compensator is provided, as well as tuning of the cuto... | 07/10/2001 |
| 6140793 | Stepper motor controller for microstepping a stepper motor and a method for microstepping a stepper motor A low overhead controller for microstepping a stepper motor and a low overhead method for microstepping a stepper motor. The reduction in overhead in system processor is accomplished by the control circuit which dynamically interpolates motor positions be... | 10/31/2000 |
| 6111333 | Magnetic bearing, rotating machine mounting the same, and method for driving rotating machine In a rotating machine with employment of a sensor-less DC brushless motor, a terminal voltage of a motor is corrected in a phase corrector by using a motor phase current signal. At this time, the terminal voltage is processed in an integrator and a compar... | 08/29/2000 |
| 6107762 | Speed control device for electrical motor-driven apparatus A speed control device particularly adapted for use with electrical motor-driven apparatus, stationary tools and hand tools having digital operator input controls. A semiconductor switching device controls a percentage of ON time for the electric motor in... | 08/22/2000 |
| 6087743 | Position control system for use with micromechanical actuators A positioning system adapted for use with micromechanical actuators provides feedback control of the position of the movable element of the actuator utilizing a low Q sensing coil. The effective inductance of the sensing coil changes with position of the ... | 07/11/2000 |
| 5994866 | Motor controller and disk drive unit A motor having enhanced transient characteristics during the acceleration time of the motor in a disk unit. The motor includes a motor controller having a phase-locked loop (PLL) or frequency-locked loop (FLL) for controlling the speed of a spindle motor ... | 11/30/1999 |
| 5990656 | Frequency detector A frequency detector for a PLL controller, the controller being for generating an output signal to control a motor driver electrically connected to a motor having multiple phase windings arranged as a stator and a rotor having a permanent magnet or a DC c... | 11/23/1999 |
| 5920173 | Feedback enhanced adaptively tuned vibration absorber An apparatus has a mass suspended between two mounting plates by a separate springs to form a resonant structure that absorbs vibration in a structural member to which the mounting plates are attached. Permanent magnets are fixed to opposite sides of the ... | 07/06/1999 |
| 5920163 | Phase detecting circuit of brushless motor and magnetic recording and reproducing apparatus using the same A differential amplifier amplifies a PG reproduction signal to a level permitting signal processing. A low-pass filter makes the signal waveform of a PG detection signal generated by the differential amplifier substantially uniform irrespectively of the r... | 07/06/1999 |
| 5854877 | Economical wide range speed control system A speed control system is disclosed wherein a brushless DC motor and a magneto resistive encoder are able to rotate a motor at arbitrarily low speeds. The motor is able to rotate at low speeds by having a filtered signal generated by an encoder applied to... | 12/29/1998 |
| 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 |
| 5808436 | Starting circuit and starting method for a brushless motor In order to start a brushless motor, a frequency setting circuit sets a frequency value, a counter increases a count value in response to a main clock signal, and a comparator compared the value of the frequency setting circuit with that of the counter an... | 09/15/1998 |
| 5742144 | Backlash compensation method for semi-closed-loop type servo control A method for properly compensating for a backlash between a servomotor and a machine moving part, such as a table, driven by the servomotor in a semi-closed-loop type control. In the semi-closed-loop type servo control, the force of a motor-driven table w... | 04/21/1998 |
| 5565722 | Magnetic bearing control system In order to stabilize a body born contactlessly in the magnetic field of a stator, there is a magnetic bearing regulator which influences the magnetic field between magnetizable components in the stator and magnetizable components of the body. The bearing... | 10/15/1996 |
| 5449990 | Single cycle positioning system A single cycle positioning system utilizing a three phase wye connected induction motor (10) includes a three phase inverter (28) and a microprocessor (20) for controlling the inverter to generate three phases of power. Pulse width modulation techniques a... | 09/12/1995 |
| 5339016 | Crossover and spectral preemphasis networks for adaptive inverse control A feedback control system provides an adjusted command signal to a plant in response to a command signal having a plurality of command signal components. The plant controls a subsystem and provides a feedback signal representative of the subsystem's achie... | 08/16/1994 |
| 5221882 | Motor servo apparatus Where T1 is a period of a dynamic operation range of a phase comparative waveform of a motor servo apparatus, and a period T0 of a reference phase signal is measured, the reference phase signal is delayed by T3 =T0 | 06/22/1993 |
| 5220262 | Method and apparatus for reducing cross-coupled movement through the structural dynamics of a computer numerically controlled machine A method and apparatus are disclosed for reducing the cross-coupled movement in a member of a CNC machine caused by movement in another member of the machine through the structural dynamics of the machine. The method includes receiving the discrete positi... | 06/15/1993 |
| 5196775 | Switched reluctance motor position by resonant signal injection A apparatus is provided for estimating the position of a rotor of a commutated brushless motor operating without a shaft position sensor. The apparatus includes a tank circuit that incorporates a phase winding of the motor. A low-power signal of a frequen... | 03/23/1993 |
| 4843292 | Direct drive motor system A direct drive motor system for controlling driving of the joints of a multi-jointed robot, comprising a motor portion, a rotation detecting portion, a position control portion, a speed control portion, a driving circuit and a tuning portion, wherein the ... | 06/27/1989 |
