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| Number | Title | Issue Date |
| 8159174 | Method for adapting controller parameters of a drive to different operating states A method is provided for adapting controller parameters of a drive to different operating states. A control loop includes a PID controller whose I gain factor is adapted to a drive velocity and/or whose D gain factor is adapted to a drive current, and consequently t... | 04/17/2012 |
| 8093855 | Low speed control method and apparatus for servo motor A low speed control method and an apparatus for a servo motor. The control apparatus comprises: an encoder capable of acquiring a speed signal from a servo motor and encoding the speed signal to output a low-resolution encoded signal; an insertion calculation unit c... | 01/10/2012 |
| 8076891 | Motor controller A motor controller drives and controls a motor to drive a shaft subject to gravity. The motor controller includes a PI control unit which controls the velocity of the motor, a brake which prevents the falling of the shaft in accordance with a brake signal, and a sto... | 12/13/2011 |
| 8063602 | Stochastic anti-windup proportional-integral (PI) controller Different circuit-based implementations of stochastic anti-windup PI controllers are provided for a motor drive controller system. The designs can be implemented in a Field Programmable Gate Arrays (FPGA) device. The anti-windup PI controllers are implemented stocha... | 11/22/2011 |
| 7982424 | Document reading apparatus, document reading method, and program for reading document The invention provides, as an aspect thereof, an document reading apparatus that includes: a speed calculating unit that calculates a speed related to the rotation of a motor on the basis of a signal that is outputted from an encoder; and a controlling unit that cal... | 07/19/2011 |
| 7956567 | Motor drive control device and image forming apparatus A motor drive control device for controlling a rotational speed of a motor includes: a motor driver for rotationally driving a motor; a correction amount calculating section for detecting a rotational speed of an output of the motor in accordance with an alternate c... | 06/07/2011 |
| 7847509 | System and method for controlling electric motors to simulate a mechanical differential System and methods of controlling a plurality of motors based on a motor motion attribute, such as rotor position, velocity, or acceleration, which simulate the properties of a mechanical differential, including a pure differential, a limited slip differential, and/... | 12/07/2010 |
| 7812557 | Motor controller, washing machine, and motor control method A motor controller includes an output voltage modulator that outputs sinusoidally-modulated voltage for driving a motor; a modulation factor specifier allowing specification of a modulation factor greater than 1.0 for the output voltage; a current detector that dete... | 10/12/2010 |
| 7733041 | Method and device for driving rotating-body, process cartridge, image forming apparatus, and computer program product A plurality of detection target portions are arranged around a rotating shaft of a rotating-body, one of which causes a detector to generate a first detection signal different from a second detection signal generated from the others. A first generating unit generate... | 06/08/2010 |
| 7436145 | Method and apparatus for controlling brushless DC motors in implantable medical devices Methods and apparatus for controlling a polyphase motor in implantable medical device applications are provided. In one embodiment, the polyphase motor is a brushless DC motor. The back emf of a selected phase of the motor is sampled while a drive voltage or the sel... | 10/14/2008 |
| 7433762 | Methods for controlling multiple actuators Methods for controlling at least two actuators are provided. An internal control system sends an input received from the main control system to a first actuator and diverts a portion of the input to a second actuator when an input constraint of the first actuator is... | 10/07/2008 |
| 7432681 | Scanner system A scanner system includes a servo control unit. A rotation angle of a rotating shaft supporting a mirror is detected, and an error of the detected value with respect to a commanded value is integrated by an integral compensator so that the detected value is able to ... | 10/07/2008 |
| 7425812 | Ramp rate closed-loop control (RRCC) for PC cooling fans A fan controller may be integrated in silicon and may use an embedded microcontroller to implement a digital fan control algorithm. The microcontroller may continually monitor temperature and sample the speed of the controlled fan. The speed of the fan may be compar... | 09/16/2008 |
| 7423406 | Power control of an induction machine Regulation of the active and reactive power of an induction machine in a coordinate system fixed on the winding, wherein a first regulator output variable is generated using a first regulator as a function of a setpoint variable deviation of the active power and a s... | 09/09/2008 |
| 7420350 | Methods and apparatus for an active front steering actuator An active front steering system includes a motor controller configured to compute a position error from a commanded position value and an actual position value, and then enter one of two modes—a commutation enable mode and a commutation freeze mode—depending upo... | 09/02/2008 |
| 7417400 | Motor controller The present invention is a motor control device comprising a control system, the control system being capable of controlling the motor by PWM and having integration means being capable of outputting an integrated value obtained by integrating a deviation between a r... | 08/26/2008 |
| 7392113 | Systems for controlling multiple actuators Methods, control systems, and information handling systems for controlling at least two actuators are provided. An internal control system sends an input received from the main control system to a first actuator and diverts a portion of the input to a second actuato... | 06/24/2008 |
| 7375934 | Power converter controlling apparatus and method applying a fault protection scheme in a motor drive system A method and apparatus control a power converter (20) of a motor drive system. The power converter (20) is controlled during a first operating mode by applying a current control scheme, which sets power converter commands to control active and reactive... | 05/20/2008 |
| 7368888 | Methods and systems for reducing unintentional collisions A method for differentiating if a feedback signal is a result of an unintentional collision in a servo system includes injecting a feed forward term in the servo system. ... | 05/06/2008 |
| 7363109 | Backlash compensation control method, backlash compensation controller and backlash compensation control program To allow a robot performing a cyclic movement upon receipt of a driving force transmitted through a driving force transmission system from a driving source along with a backlash to perform the movement compensated for the backlash, during a first period within a cyc... | 04/22/2008 |
| 7355364 | Motor and controller inversion: commanding torque to position-controlled robots Systems and methods are presented that cancel the dynamics of a motor and a joint controller in the presence of communication time delays, measurement noise, and controller parameter uncertainties inherent in a robot system. A cancellation system includes feedback o... | 04/08/2008 |
| 7352553 | Magnetic bearing control device A magnetic bearing control device includes a rotation speed sensor for detecting a rotational speed of a rotating member supported on an axial magnetic bearing and a radial magnetic bearing without contact, and a displacement sensor for detecting an axial displaceme... | 04/01/2008 |
| 7342690 | Method and apparatus for reading image An image reading apparatus of the present invention can suppress an image distortion caused by the vibration of a carriage by varying at least one of the level of a current supplied to a drive motor in accordance with a variation of an environmental temperature and ... | 03/11/2008 |
| 7327437 | Lithographic apparatus and device manufacturing method A lithographic apparatus includes an illumination system configured to condition a radiation beam, a patterning device support constructed to support a patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patt... | 02/05/2008 |
| 7325171 | Measurement and data acquisition system including a real-time monitoring circuit for implementing control loop applications A measurement and data acquisition system including a real-time monitoring circuit for implementing control loop applications. The system control loop may include the real-time monitoring circuit, a data acquisition device, a processing unit, and a plurality of subs... | 01/29/2008 |
| 7292001 | Gain adjusting method for servo control device An object of this invention is to provide a gain adjusting method in a servo control device to suppress changes according to a place where a machine is located. This invention provides a gain adjusting method for a servo control device providing speed control... | 11/06/2007 |
| 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 |
| 7276874 | Storage apparatus, seek control method and program A movement controlling unit performs movement control of a head toward a target track on a magnetic disk medium driving a head actuator, and a position controlling unit performs position control of the head actuator in accordance with proportional integral calculati... | 10/02/2007 |
| 7274163 | Methods and apparatus for commutating a brushless DC motor in a laser printer In a laser printer, methods and apparatus include commutating a brushless dc motor having three windings. A controller receives discrete motor position signals, such as from hall-effect or FG sensors, and extrapolates motor position between the signals. It commutate... | 09/25/2007 |
| 7265509 | Electric power steering apparatus The present invention provides an excellent electric power steering apparatus in which torque ripple caused by a quantization error of a current control system generated in case of slow steering state and steering holding state, namely, vibration and noise on a stee... | 09/04/2007 |
| 7253580 | Method and apparatus for adaptive motor speed control A different adaptive control method is used to control a motor during each of two or more phases of motor operation. Thus, in a first phase of motor operation the motor is controlled using a first adaptive control method, in a second phase of motor operation the mot... | 08/07/2007 |
| 7224138 | Method, system, and program product for feedback control of a target system utilizing imposition of a periodic modulating signal onto a command signal Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. ... | 05/29/2007 |
| 7218074 | Method and system for limiting the current output by a speed controller operating according to a U/F control law The present invention relates to a method for limiting the current output by a speed controller (V) for three-phase asynchronous electric motor (M), said controller (V) operating according to a control law (LC) of pure U/F type. Said method is characterized in that ... | 05/15/2007 |
| 7215095 | Driving apparatus, exposure apparatus, and device manufacturing method A driving apparatus for moving an object. The apparatus includes a first actuator which drives the object in X and Y directions, a second actuator which drives a reaction force counter which receives a reaction force generated when the first actuator drives the obje... | 05/08/2007 |
| 7209862 | Self-diagnosing system for encoder A self-diagnosing system for an encoder. The system includes an encoder circuit for outputting information detected by an encoder; a data preparing section provided in the encoder circuit and preparing data representing a state of an abnormal-state judgment factor i... | 04/24/2007 |
| 7206210 | Power supply control loop with multiple leveling modes A method and apparatus for controlling a power supply. The system includes a power supply and a controller for outputting a command signal to regulate the operation of the power supply. The controller determines the command signal based on at least one error signal ... | 04/17/2007 |
| 7205734 | Control device for vehicular opening/closing body A control device for a vehicular opening/closing body is provided with a duty ratio calculator (78), which calculates a duty ratio when power supplied to a door drive motor (48) allowing an opening/closing body to open/close is subjected to duty contro... | 04/17/2007 |
| 7202637 | Distributed control method The present invention provides an improved control method and apparatus allowing units arranged at different spaced apart locations to be controlled without the need for a high bandwidth link between the units and the controller. This allows a single controller to c... | 04/10/2007 |
| 7195323 | Electric brake system The present invention provides an electric brake system in which an actual control variable in the electric brake when overshooting is generated is determined, and the target value is set to a maximum value of the actual control variable in the electric brake when o... | 03/27/2007 |
| 7190144 | System and method for adjusting a PID controller in a limited rotation motor system An adjustment system is disclosed for adjusting a proportional, integral, derivative controller in a limited rotation motor system. The adjustment system includes a first transform unit, a second transform unit, a model identification unit, and a PID adjustment unit... | 03/13/2007 |
