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Class Information
Number: 318/601
Name: Electricity: motive power systems > Positional servo systems (e.g., servomechanisms) > Digital or numerical systems > Digital comparison
Description: Subject matter in which the system error signal is obtained by comparison of the digital command signal with a position feedback signal

Sub-classes under this class:

Class Number Class Name Patents
318/602 Commutating switch-type encoder 168

Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
8710787 Servomotor control circuit Apr. 29, 2014
8706369 Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load estimation Apr. 22, 2014
8373370 Sensorless control method of high performance permanent magnet synchronous motor during emergency operation Feb. 12, 2013
8228011 Bi-direction driver IC and method for bi-directionally driving an object Jul. 24, 2012
8212515 Microcomputer and motor control system provided therewith Jul. 3, 2012
8054018 Multi-level programming of motor for a ventilation system Nov. 8, 2011
8030864 Motor drive circuit Oct. 4, 2011
8013561 Driving mechanism having position encoder for two-dimensional positioning Sep. 6, 2011
8013562 Driving mechanism having position encoder for two-dimensional positioning Sep. 6, 2011
7911171 Device for generating analog current or voltage signal Mar. 22, 2011
7813978 Methods and systems for managing and approving legal expenses Oct. 12, 2010
7804267 Correction method for microprocessor-controlled digital regulation Sep. 28, 2010
7804268 Apparatus and method of controlling injection in electric injection molding machine Sep. 28, 2010
7791305 Control apparatus of servo motor Sep. 7, 2010
7750592 Axis-of-rotation position control device Jul. 6, 2010
7723942 Integrated motor and resolver including absolute position capability May. 25, 2010
7719224 Simulated encoder pulse output system and method May. 18, 2010
7659681 Numerical controller Feb. 9, 2010
7576503 Brushless motor control apparatus for pump Aug. 18, 2009
7504785 System for controlling an electrostatic stepper motor Mar. 17, 2009
7291999 System and method for diagnosing a controller in a limited rotation motor system Nov. 6, 2007
7282883 Pivoting and barrier locking operator system Oct. 16, 2007
7262959 Drawer-type storage-unit housing apparatus Aug. 28, 2007
7183731 Pulse generating method and pulse generator, and motor control system using the same Feb. 27, 2007
7180257 Method of brake pulse rejection in commutation pulse detection circuits Feb. 20, 2007
7170251 System and method for diagnosing a controller in a limited rotation motor system Jan. 30, 2007
7164244 Apparatus for controlling electric motors and related control method Jan. 16, 2007
7148647 Numerical control device Dec. 12, 2006
7135831 Method and device for controlling motor Nov. 14, 2006
7103448 Robot system Sep. 5, 2006
7062159 Device for correcting a digital estimate of an electric signal Jun. 13, 2006
7057364 Actuation system comprising a digital position sensor Jun. 6, 2006
7049778 Inverter control apparatus and inverter control method May. 23, 2006
7012397 Encoder and control apparatus for motor Mar. 14, 2006
6998810 Position controller of feed shaft Feb. 14, 2006
6995538 Rotational direction detecting apparatus for a three-phase brushless DC motor Feb. 7, 2006
6967459 Method for controlling or regulating the current in a direct current machine for a fan Nov. 22, 2005
6949900 MCU control for brushless DC motor Sep. 27, 2005
6912427 Programmable limit switch with distributed intelligence Jun. 28, 2005
6894453 Method and apparatus to measure disk drive head load/unload velocity May. 17, 2005
6876891 Method and apparatus for providing tactile responsiveness in an interface device Apr. 5, 2005
6822414 Motor controller Nov. 23, 2004
6707269 Motor control circuit with adaptive dynamic range selection Mar. 16, 2004
6445961 Control system and method Sep. 3, 2002
6445966 Data interface module for motor control system Sep. 3, 2002
6429618 Index signal generator Aug. 6, 2002
6333613 Servo system control device and control method Dec. 25, 2001
6323614 System and method for controlling suspension using a magnetic field Nov. 27, 2001
6294910 Digital position sensor for sensing position of a moving target Sep. 25, 2001
6218800 Control system, driving system and control method, apparatus including the driving system Apr. 17, 2001

1 2 3 4 5

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