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| Number | Title | Issue Date |
| 7405528 | Global closed loop control system with DV/DT control and EMI/switching loss reduction A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides ... | 07/29/2008 |
| 7365511 | Methods to control high speed electric machines having a front-end EMI filter attached A system and method for extracting estimated input voltage and input current values of an AC motor based on sensed power inverter output voltage and output current when the AC motor is connected to a front-end EMI filter and the EMI filter is connected to a power in... | 04/29/2008 |
| 7352594 | Stage for rectifying a three-phase current The rectification stage (18) having: an autotransformer (40) for twelve-phase rectification; two rectifiers (50A, 50B) each of which is connected at the input to three separate phases of... | 04/01/2008 |
| 7335070 | Shift operation apparatus for outboard motor, electronic remote control apparatus for medium-sized boat, and engine control apparatus A shift operation apparatus for an outboard motor of the present invention comprises a case fixed to an outboard motor, a motor provide at the case, a worm gear which is rotated by the motor, a worm wheel engages with the worm gear, an output shaft provided so as to... | 02/26/2008 |
| 7321211 | Power variation control system for cyclic loads A method and apparatus for managing power demand of a motor in a cyclic load system having a rotational mass is provided. Flat power draw is achieved through continuous manipulation of the motor torque as a function of feedback velocity while using the rotational ma... | 01/22/2008 |
| 7318018 | Control system A control system which is capable of compensating for and suppressing the influence of a periodic disturbance on a controlled object more quickly, even when the controlled object is subjected to the periodic disturbance the amplitude of which periodically changes, t... | 01/08/2008 |
| 7224133 | Control apparatus, dual chip inverter and single chip inverter of AC motors A control apparatus and a semiconductor apparatus of AC motors capable of reducing torque ripple with a comparatively simple circuit corresponding to a high withstand voltage and capable of driving a motor at high efficiency even when the rotational speed or load ha... | 05/29/2007 |
| 7170247 | Method of control of magnetic sound of alternating current rotating machine A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n−1-th order frequency in inverse turn on a multi-phase alternating current with reference to a basic frequency component of ... | 01/30/2007 |
| 7158328 | Multi-phase acceleration of a data storage disc A disc drive having a multi-phase acceleration procedure is disclosed. The multi-phase acceleration procedure accelerates a data storage disc in the disc drive from an initial rotational velocity to a final rotational velocity. As the disc reaches the final rotation... | 01/02/2007 |
| 7145307 | Data storage apparatus and control method thereof with compensation Embodiments of the invention provide a data storage apparatus and its control method capable of accurately reading/writing data. A data storage apparatus in an embodiment of the invention comprises: a servo control section which, based on servo data stored on the st... | 12/05/2006 |
| 7141951 | Data storage apparatus with compensation for vibration and control method thereof Embodiments of the invention provide a data storage apparatus and its control method capable of accurately reading/writing data. In one embodiment, a data storage apparatus comprises: a servo control section which, based on servo data stored on the storage medium, g... | 11/28/2006 |
| 7132812 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around fi... | 11/07/2006 |
| 7126304 | Motor controller and electric power steering apparatus A microcomputer includes a rotation angular velocity computation section, a feedback gain determination section, and a dead time compensation amount determination section. The rotation angular velocity determination section computes the rotation angular velocity of ... | 10/24/2006 |
| 7126301 | Motor driver A motor driver drives a motor composed of a rotor and plural-phase windings that generate a magnetic field for rotating the rotor, including: a plurality of transistors that operate as switches for supplying current to the windings; a position detector operable to d... | 10/24/2006 |
| 7061195 | Global closed loop control system with dv/dt control and EMI/switching loss reduction A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides ... | 06/13/2006 |
| 7049783 | Method of control of magnetic sound of alternating current rotating machine A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n−1-th order frequency in inverse turn and an m+1-th order magnetic sound reduction use harmonic current in the same turn on ... | 05/23/2006 |
| 7026781 | Stepping motor driving system, information recording and reproducing device, and stepping motor driving method A stepping motor driving system includes: a stepping motor that rotates at a predetermined angle according to a driving pulse signal, a vibration detector that detects vibration to output a vibration signal, and a stepping motor control unit that controls the drivin... | 04/11/2006 |
| 6995943 | Off-track error recovery method and apparatus for disk drive An off-track error recovery method and apparatus for a disk drive are disclosed herein. Off-track errors are either due to vibration of the disk drive or due to defective servo data stored on a disk surface of the disk drive. In order to tailor error recovery operat... | 02/07/2006 |
| 6987372 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around fi... | 01/17/2006 |
| 6979965 | Spring return actuator for a damper An actuator including an electric motor driven by a drive circuit powered by a power source, and a load coupled to the electric motor. The actuator further includes a spring biasing the load to a first position, and a microcontroller coupled to the electric motor to... | 12/27/2005 |
| 6914399 | Active deadtime control for improved torque ripple performance in electric machines A method for implementing active deadtime control of an inverter associated with an electric motor is disclosed. In an exemplary embodiment, the method includes receiving a command voltage signal indicative of a desired load to be driven by the motor. Based upon the... | 07/05/2005 |
| 6867564 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around fi... | 03/15/2005 |
| 6802205 | Moisture detection system and method of use thereof A moisture detection system includes an electrical conductor disposed on a surface of a substrate. The electrical conductor has a resonant frequency that varies as a function of an amount of moisture present adjacent the electrical conductor. An oscillator outputs a... | 10/12/2004 |
| 6729434 | Electrical power assisted steering systems An electric power assisted steering system is disclosed in which a torque demand signal (8) is generated and applied to an electric motor (1) operatively connected to a steering mechanism (5) in order to assist a driver of the vehicle when steer... | 05/04/2004 |
| 6690139 | Method and apparatus to limit motor current at low frequencies A method and apparatus for use with an induction machine system including a controller and d and q-axis current feedback loops, the controller receiving a frequency command signal and generating d and q-axis voltage command signals, the method for limitin... | 02/10/2004 |
| 6617814 | Integrated DC link choke and method for suppressing common-mode voltage in a motor drive A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are woun... | 09/09/2003 |
| 6583598 | DAMPING OF RESONANT PEAKS IN AN ELECTRIC MOTOR WHICH IS OPERATED USING A CONVERTER WITH AN INTERMEDIATE VOLTAGE CIRCUIT, BY MEANS OF MATCHED IMPEDANCE TO GROUND AT THE MOTOR STAR POINT, AND A CORRESPONDING ELECTRIC MOTOR A system and method for damping of resonant peaks in an electric motor which is operated using a converter with an intermediate voltage circuit, by means of a matched impedance to ground at the motor star point, and a corresponding electric motor is discl... | 06/24/2003 |
| 6580248 | DAMPING OR RESONANT PEAKS IN AN ELECTRIC MOTOR WHICH IS OPERATED USING A CONVERTER WITH AN INTERMEDIATE VOLTAGE CIRCUIT, BY MEANS OF A TRANSFORMER-COUPLED DAMPING RESISTANCE, AND A CORRESPONDING ELECTRIC MOTOR In a converter system having an intermediate voltage circuit which operates with a supply network-side input inductor in the step-converter mode or has other input-side inductances, there is a risk of natural system oscillations being formed via discharge... | 06/17/2003 |
| 6483265 | Methods and systems for minimizing vibration in electric machines Methods and apparatus for minimizing electrical machine vibration are described. In an exemplary embodiment of the method, power is applied to the motor under microprocessor control such that a pulse modulated current profile is applied to the motor which... | 11/19/2002 |
| 6452355 | Control method and numerical control for the vibration-reduced acceleration of a movable machine element The present invention is a control method and numerical control for the vibration-reduced acceleration of a movable machine element of a numerically controlled industrial processing machine, in which a path of movement of the machine or machine element is... | 09/17/2002 |
| 6426605 | Multi-phase induction motor drive system and method A multiphase induction motor system is disclosed. The system comprises a motor having at least five phases and comprising a stator and a rotor. For each phase, the motor receives a command current to power the motor, where the command current has a fundam... | 07/30/2002 |
| 6408130 | Electric drive system with an electronically commuted DC motor in order to reduce torque irregularities The invention relates to an electric drive device with a DC motor (2) comprising a control circuit with an electronic commutator (3). The invention is characterized in that a derivation of a control signal (V_i_ref) is obtained from an induced motor volta... | 06/18/2002 |
| 6401016 | Vehicle control device A target output torque and target power generation output of a motor are computed based on a vehicle running state, and a target input rotation speed of a generator is computed based on the target power generation output. The final target output torque of... | 06/04/2002 |
| 6222336 | Rotational vibration detection using spindle motor velocity sense coils An apparatus and method for detecting rotational vibration applied to a disc drive having an actuator supporting a head adjacent a rotatable disc. A spindle motor has a set of driver coils which rotate the disc through electrical commutation, and a set of... | 04/24/2001 |
| 6147465 | Microprocessor controlled single phase motor with external rotor having integral fan A motor powered by a dc power source has a stator having a single phase winding. A power switching circuit of the motor has power switches for selectively connecting the dc power source to the single phase winding. A permanent magnet rotor in magnetic cou... | 11/14/2000 |
| 6140792 | Motor drive control apparatus and method, and image forming apparatus using the method The invention detects vibrations of a motor by a vibration detection means, compares the detected vibration detection value with a reference value using control means, and changes the voltage to be applied to each of coils of the respective excitation pha... | 10/31/2000 |
| 6014001 | Method for powering an electronically switched variable reluctance motor, and power supply circuit therefor A method for powering an electronically switched variable reluctance motor (100) from a single-phase AC voltage source (17) is disclosed. Each phase of the motor is sequentially subjected to a magnetizing sequence, a demagnetizing sequence and an energy t... | 01/11/2000 |
| 5905352 | Magneto-repulsion punching with dynamic damping Dimpling of a workpiece by rebounding of a magnetic repulsion punch mechanism, when operated at high punching rates, is avoided by application of a damping pulse at a point at or subsequent to a mid-point of a return stroke of the punch from the workpiece... | 05/18/1999 |
| 5811949 | Turn-on delay compensator for motor control A method and apparatus for essentially eliminating turn-on delay distortions in terminal voltages and currents in a three phase motor control system wherein a compensator provides correction voltages which are added to command voltages as a function of fe... | 09/22/1998 |
| 5777449 | Torque ripple reduction using back-emf feedback Methods and apparatuses are provided to identify and extract a torque ripple signal found in the back-emf signal from an electric motor. The torque ripple signal is used in a feedback control loop to reduce the amount and effects of torque ripple in the m... | 07/07/1998 |
