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| Number | Title | Issue Date |
| 8179077 | Frequency converter The present invention relates to a frequency converter comprising electric power supply devices for supplying electric power to an electric motor (26) to be connected to the frequency converter, a controller configured to control the electric power supply. In... | 05/15/2012 |
| 8093856 | Position control apparatus for numerically controlled machine In a position control apparatus that drives a feed-axis with a servomotor of a machine tool, the machine tool may be quickly accelerated or decelerated in a state where a machine structural member that supports and fixes a structural member including a driving syste... | 01/10/2012 |
| 8058833 | Fine resolution motor control Methods and apparatus are provided for deriving precision position and rate information for motors using relatively low precision analog sensors, and for implementing compensation techniques that overcome inherent sensor errors and rotor magnet flux tolerances. ... | 11/15/2011 |
| 8013560 | Method for compensating for angular transmission error of an actuator The non-linear elastic deformation component included in the angular transmission error of an actuator provided with a wave gear drive is a component of the angular transmission error occurring due to elastic deformation of a flexible externally-toothed gear when th... | 09/06/2011 |
| 8008880 | Motor controller and electric power steering apparatus A signal generating section includes a second calculating section that corrects phase resistance. The calculating section stores resistance values of phases that have been measured in advance and a reference resistance value. The calculating section calculates corre... | 08/30/2011 |
| 7999500 | Calibrating spindle motor controllers Methods, systems, and apparatus, including computer program products, are described for calibrating spindle motor controllers. In one aspect, a method is provided that includes receiving a compensator output from a spindle motor controller that compensates for varia... | 08/16/2011 |
| 7982425 | Position control apparatus A position control apparatus includes a reverse displacement calculation unit configured to calculate a reverse displacement that represents an amount of movement made from a preceding reverse point to a current reverse point by an axis that performs a reversing mot... | 07/19/2011 |
| 7956568 | Servo motor controller A servo motor controller having: a frequency identification section that performs analysis based on a frequency response method and identifies the frequency of a disturbance exhibiting a specified phase lag; an input/output gain identification section that identifie... | 06/07/2011 |
| 7936144 | Self-calibration algorithms in a small motor driver IC with an integrated position sensor A motion control device for controlling a motor is presented. The motion control device is operable to scale or adjust an input relative to an input range that is based on calibration values and to use that scaled input to produce a drive signal to drive the motor. ... | 05/03/2011 |
| 7928683 | High phase order AC machine with short pitch winding A high phase order alternating current rotating machine is disclosed having an inverter drive that provides more than three phases of drive waveform of harmonic order H, and characterized in that the windings of the machine have a pitch of less than 180 rotational d... | 04/19/2011 |
| 7923957 | Control system and method for motor drivers A control method for motor driver includes: outputting a first signal from the controller to the first motor driver; making the first timer start to count for a first time; returning a first feedback signal from the first motor driver to the controller; dividing a v... | 04/12/2011 |
| 7888902 | Adjustable voice coil motor driver A method of configuring a signal for controlling a voice coil motor (VCM) is disclosed. A voltage at an error amplifier of a VCM driver is accessed. A target value at the error amplifier is accessed. A difference value between the target value and the voltage is det... | 02/15/2011 |
| 7782005 | Power converter control In a power converter including an inverter configured to convert a direct current voltage into an alternating current voltage by controlling switching devices to be turned ON or OFF based on a control signal and to output the alternating current voltage to a load, a... | 08/24/2010 |
| 7764041 | System and method to extend synchronous operation of an active converter in a variable speed drive Systems and methods for synchronous operation of variable speed drives having active converters include extending the synchronous operation of an active converter to the AC mains voltage during complete line dropout. A phase angle control circuit includes a squaring... | 07/27/2010 |
| 7746020 | Common mode & differential mode filter for variable speed drive Systems and methods for improved Variable Speed Drives having active inverters include an input filter for filtering common mode and differential mode currents. A three-phase inductor has three windings, each winding of the three-phase inductor having a center tap d... | 06/29/2010 |
| 7656114 | Servo control apparatus for a linear motor A servo control apparatus for a linear motor comprises a position feedback device, a driver and a position compensating device that are connected with one another. The servo control apparatus is electrically connected to the linear motor. By such arrangements, it ca... | 02/02/2010 |
| 7652445 | On-chip compensation for a fully differential voice coil motor control A disk drive controller including a differential voice coil motor control function is disclosed. The differential voice coil motor control function includes an on-chip compensation network for the inner control loop, including a resistor formed of one or more MOS tr... | 01/26/2010 |
| 7560891 | Position control apparatus A deflection amount Ps representing a difference between a position detection value Pl of a driven body and a position detection value Pm of a motor is detected. A position calculator proportional constant Kp, a time constant Tp of a first-order lag circuit that inp... | 07/14/2009 |
| 7528566 | Method for controlling voltage of DC link for electric vehicle Disclosed is a method for controlling a voltage of a DC link for an electric vehicle, which can reduce a capacitance of the DC link interposed between an inverter and a DC/DC converter. The method for controlling the voltage of the DC link in a power system o... | 05/05/2009 |
| 7511444 | Motor control apparatus for controlling motor to drive output shaft with positioning accuracy unaffected by backlash in rotation transmission system A motor control apparatus controls a motor that drives an output shaft through a rotation transmission system. The difference between a newly established output shaft target rotation angle and a detected output shaft rotation angle is obtained, a target rotation ang... | 03/31/2009 |
| 7501784 | Compensation method and apparatus for preventing damaging bearing currents in an electrical machine In an apparatus to increase the service life of bearings in an electric machine, the bearing currents that act on the bearings of the rotor are reduced by the application of a corresponding negative field voltage to the rotor, obtained with the aid of a compensation... | 03/10/2009 |
| 7498760 | Drive control apparatus A drive control apparatus including a feed-forward operation amount generation device, a feed-back operation amount generation device, a feed-forward correction amount generation device and a feed-forward operation amount correction device is provided. The drive con... | 03/03/2009 |
| 7471056 | Control device A control device includes a first switch (400) by which an input signal to a motor speed control loop (910) is selected from a signal of a position control loop (300) and a signal of the speed control loop (200), and a switch controller (... | 12/30/2008 |
| 7453229 | Apparatus and method for controlling operation of reciprocating compressor An apparatus and method for controlling the operation of a reciprocating compressor are capable of preventing distortion of a current applied to the reciprocating compressor by generating a current amplitude value for compensating a difference value between a stroke... | 11/18/2008 |
| 7429847 | Motor control device A controller performs processing for calculating a main torque control value, processing for outputting a final control torque value based on the main torque control value and a vibration-suppression torque control value for mitigating torque fluctuation that occurs... | 09/30/2008 |
| 7423403 | Motor control system A motor control system which can realize current detection with high accuracy by using an amplifier having an ordinary level of accuracy and can avoid deterioration of current detection accuracy even when emperature is changed. The motor control system comprises a s... | 09/09/2008 |
| 7418302 | Floating deadband control A method of controlling an input device is disclosed. A deadband is generated about a first position when the input device is at the first position. The input device is moved from the first position to one or more additional positions. The deadband width is varied b... | 08/26/2008 |
| 7405531 | Torque-position transformer for task control of position controlled robots Torque control capability is provided to a position controlled robot by calculating joint position inputs from transformation of the desired joint torques. This is based on calculating the transfer function 1/E(s), which relates the desired joint torque to joint pos... | 07/29/2008 |
| 7405529 | System and method for controlling linear compressor A system for controlling a linear compressor, generates freezing force as a piston reciprocates according to rotation of a motor which receives alternating current power through a triac. The system includes a controller which moves up or delays a trigger signal corr... | 07/29/2008 |
| 7405525 | Method for the control of an electric machine and/or device for the control thereof The invention relates to a method for the control of an electric machine (5), wherein a control unit (1) comprises a parameterisable speed control (26) and a parameterisable additional control (28). The electric machine (5) is prov... | 07/29/2008 |
| 7372231 | Movable body position control device and stage device using the movable body position control device A movable body position control device includes a pair of position detectors configured to detect moving positions of both ends of a movable body; a pair of driving parts, the driving parts being configured to drive the both ends of the movable body based on a detec... | 05/13/2008 |
| 7364554 | Apparatus for administering acoustic shock waves having a removable and replaceable component with a data storage medium A medical device is described, which comprises a basic device and at least one replaceable component connected therewith, said component having an item belonging to the device that is subjected to high wear or consumption. A storage medium is connected to the compon... | 04/29/2008 |
| 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 |
| 7362068 | Closing member control system A controller reduces an output of the drive motor when a window glass reaches a speed shift position, which is between a fully open position and a fully closed position of the window glass, in a closing operation of the window glass. The controller increases the out... | 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 |
| 7352142 | Apparatus and method for controlling stroke of reciprocating compressor An apparatus for controlling an operation of a reciprocating compressor includes a voltage detecting unit for detecting a positive half-wave voltage of an AC voltage applied to a motor of the reciprocating compressor; a current detecting unit for detecting a positiv... | 04/01/2008 |
| 7352305 | Method and circuit for interpolating encoder output Two-phase sinusoidal signals QA, QB output from an encoder are interpolated by sample-and-hold (S/H) circuits and A/D conversion (ADC) circuits, and data D is output in accordance with a data request signal RQ from exterior. For this interpolation of encoder output,... | 04/01/2008 |
| 7348745 | Controller First and second acceleration detectors are attached to first and second sections on a driven body, and values of accelerations α1 and α2 in a travel direction of the driven body are detected. On the basis of the difference or sum of the acceleration... | 03/25/2008 |
| 7348752 | Stage apparatus and lithographic apparatus A stage apparatus and a lithographic apparatus comprising such a stage apparatus are described. The stage apparatus includes an electromagnetic motor arranged to displace an object table, an electromagnetic actuator configured to position the object table and a devi... | 03/25/2008 |
| 7345442 | Device for controlling electric-motor power steering device Distortions of motor voltage and current and a torque ripple of the motor are generated by dead band compensation for preventing an arm short circuit of an inverter, and a feeling of physical disorder is given in a handle operation. Therefore, the distortions of the... | 03/18/2008 |
