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Class Information
Number: 318/592
Name: Electricity: motive power systems > Positional servo systems (e.g., servomechanisms) > Multiple mode systems > Fine and coarse systems
Description: Subject matter in which a plurality of position error detectors, one for each operating mode, are provided. The first of these position error detectors provides a coarse signal which is indicative of the rough or approximate final position. When the "coarse" position is approached, the "fine" position error detectors successively take over and precisely direct the servo to it final position. Complete servo control is thus realized at all time.

Sub-classes under this class:

Class Number Class Name Patents
318/594 Digital systems 133
318/595 Multiple speed synchro systems 19
318/593 Separate fine and coarse motors 45

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8510069 Feedback apparatus and feedback method for controlling a servomotor Aug. 13, 2013
8374421 Methods and systems for extracting still frames from a compressed video Feb. 12, 2013
8143818 Ultrasonic motorized stage Mar. 27, 2012
7915888 Systems and methods for detecting angular position Mar. 29, 2011
7598697 Electric motor and a method therefor Oct. 6, 2009
7579793 System and method for efficient wide dynamic range coil drive Aug. 25, 2009
7545112 Fan motor control method and device thereof Jun. 9, 2009
7504794 Planar motor Mar. 17, 2009
7446497 Fixed-position stop control apparatus for rotation shaft Nov. 4, 2008
7282874 Alignment apparatus, exposure apparatus, and device manufacturing method Oct. 16, 2007
7237512 Controller cooling structure in electric vehicle Jul. 3, 2007
7209862 Self-diagnosing system for encoder Apr. 24, 2007
7057364 Actuation system comprising a digital position sensor Jun. 6, 2006
6992450 Active mass damper Jan. 31, 2006
6984947 Apparatus and method for adjusting components of an optical or mechanical system Jan. 10, 2006
6940252 DC motor control method and apparatus Sep. 6, 2005
6806674 Control device for driving and controlling a servomotor Oct. 19, 2004
6791293 Sensorless control device for synchronous electric motor Sep. 14, 2004
6787768 Method and apparatus for tool and tip design for nanomachining and measurement Sep. 7, 2004
6750625 Wafer stage with magnetic bearings Jun. 15, 2004
6725105 Bucket shakeout mechanism for electro-hydraulic machines Apr. 20, 2004
6707269 Motor control circuit with adaptive dynamic range selection Mar. 16, 2004
6563283 Motor control device May. 13, 2003
6478434 Cryo micropositioner Nov. 12, 2002
6430465 Abbe error correction system and method Aug. 6, 2002
6408216 Position control apparatus using servomotor Jun. 18, 2002
6320345 Command trajectory for driving a stage with minimal vibration Nov. 20, 2001
6320343 Fine phase frequency multipiler for a brushless motor and corresponding control method Nov. 20, 2001
6281655 High performance stage assembly Aug. 28, 2001
6226558 Method of controlling the drive of a computer-controlled conveyor device May. 1, 2001
6181097 High precision three-dimensional alignment system for lithography, fabrication and inspection Jan. 30, 2001
6178286 Adaptive tape drive control in a video recorder Jan. 23, 2001
6037735 Slow-speed servomechanism Mar. 14, 2000
6013996 Precision stop control for motors Jan. 11, 2000
6008610 Position control apparatus for fine stages carried by a coarse stage on a high-precision scanning positioning system Dec. 28, 1999
5962999 Method of controlling a torque ripple of a motor having interior permanent magnets and a controller using the same method Oct. 5, 1999
5900707 Stage-drive control apparatus and method, and scan-projection type exposure apparatus May. 4, 1999
5886491 Position control unit for electric motor Mar. 23, 1999
5874821 Method and apparatus for controlling a brushless electro motor by determining the absolute phase position of the rotor relative to the stator Feb. 23, 1999
5801939 Precision positioning control apparatus and precision positioning control method Sep. 1, 1998
5751585 High speed, high accuracy multi-stage tool positioning system May. 12, 1998
5686804 System for measuring the angle of rotation Nov. 11, 1997
5625310 Signal processing apparatus and displacement detecting apparatus using the same Apr. 29, 1997
5608588 Method for controlling digital closed servo loop system and disk storage apparatus using the system Mar. 4, 1997
5552687 Emergency robot shutdown circuit Sep. 3, 1996
5530331 Encoder, servo system and industrial robot Jun. 25, 1996
5521478 Actuator used for heating, cooling and climatic valves in vehicles May. 28, 1996
5504407 Stage driving system Apr. 2, 1996
5486745 Method and apparatus for synchronizing system operations using a programmable element Jan. 23, 1996
5416395 Carriage drive control for a printer May. 16, 1995

1 2 3

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