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Class Information
Number: 318/621
Name: Electricity: motive power systems > Positional servo systems (e.g., servomechanisms) > With stabilizing features (e.g., anti-hunting, damping) > Lead or lag networks
Description: Subject matter in which the stabilizing means is a lead or lag circuit or a combination of both. A "lead" circuit is defined as a circuit whose output voltage leads the input voltage over a certain range of frequencies. Sometimes it may be referred to as an "integrating" circuit.

Sub-classes under this class:

Class Number Class Name Patents
318/622 A.c. networks 10

Patents under this class:
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Patent Number Title Of Patent Date Issued
8704478 Motor drive circuit Apr. 22, 2014
8653780 Integrated upsampler and filtering for multi-rate controller for electro-mechanical flight actuation system Feb. 18, 2014
8629642 Closed-loop motor driver compensation Jan. 14, 2014
8427117 Electromechanical arrangement Apr. 23, 2013
8274252 Motor control apparatus Sep. 25, 2012
8138708 Closed-loop motor driver compensation Mar. 20, 2012
8120302 Servo control apparatus Feb. 21, 2012
7956567 Motor drive control device and image forming apparatus Jun. 7, 2011
7957844 Device and a method for power balancing Jun. 7, 2011
7911172 Machine position control device Mar. 22, 2011
7911173 Open loop method for controlling power Mar. 22, 2011
7902786 Motor controller Mar. 8, 2011
7847509 System and method for controlling electric motors to simulate a mechanical differential Dec. 7, 2010
7808199 Control apparatus Oct. 5, 2010
7733041 Method and device for driving rotating-body, process cartridge, image forming apparatus, and computer program product Jun. 8, 2010
7725201 Feedback control device May. 25, 2010
7715964 Very low speed vehicle control algorithm operating in the spatial domain May. 11, 2010
7589484 Closed loop acceleration control for a data storage device motor Sep. 15, 2009
7528566 Method for controlling voltage of DC link for electric vehicle May. 5, 2009
7498760 Drive control apparatus Mar. 3, 2009
7495409 Method and apparatus for eliminating stall and cogging in multi-phase stepping motors Feb. 24, 2009
7432681 Scanner system Oct. 7, 2008
7376063 Control circuit of optical storage device and method thereof May. 20, 2008
7345442 Device for controlling electric-motor power steering device Mar. 18, 2008
7345448 Adaptive command filtering for servomechanism control systems Mar. 18, 2008
7265507 Angular position and velocity estimation for synchronous machines based on extended rotor flux Sep. 4, 2007
7245975 Skew compensation Jul. 17, 2007
7208901 Control method for jerk-limited speed control of a movable machine element of a numerically controlled industrial processing machine Apr. 24, 2007
7184847 Method and system for controlling a process in a plant Feb. 27, 2007
7102315 Robot arm control method and control device Sep. 5, 2006
7042186 Decoupling a harmonic signal from a signal path May. 9, 2006
6914404 Motor controller Jul. 5, 2005
6861816 Positional control of a controlled object during movement initiation Mar. 1, 2005
6825633 Method for adapting jerk profiles through jerk limitation for minimizing excitations of oscillations during movement of a machine element Nov. 30, 2004
6812668 Apparatus, method and program for controlling an electric motor Nov. 2, 2004
6713978 Method and system for determining induction motor speed Mar. 30, 2004
6696809 Robot, servo circuit, actuator, robot control method, and actuator driving method Feb. 24, 2004
6566837 Position controller for motor May. 20, 2003
6507165 Controller for machine Jan. 14, 2003
6477445 Method and apparatus for controlling an industrial robot Nov. 5, 2002
6323614 System and method for controlling suspension using a magnetic field Nov. 27, 2001
6255794 Procedure for the digital evaluation of analogue resolver output signals Jul. 3, 2001
6252369 Motor speed controller and gain setting method of the controller Jun. 26, 2001
6084371 Apparatus and methods for a human de-amplifier system Jul. 4, 2000
5979587 Electrically assisted power steering apparatus Nov. 9, 1999
5838123 Automatic phase adjuster for a brushless motor driving signal Nov. 17, 1998
5625267 Constant delay filtering for synchronized motion on multiple axes Apr. 29, 1997
5581166 Industrial robot with servo Dec. 3, 1996
5323096 Servomotor control device using servomotor rotation speed extrapolation Jun. 21, 1994

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