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Class Information
Number: 318/66
Name: Electricity: motive power systems > Plural, diverse or diversely controlled electric motors > Running-speed control
Description: Subject matter in which means are provided for controlling the running speed of two or more electric motors.

Sub-classes under this class:

Class Number Class Name Patents
318/82 Armature or primary circuit control 14
318/67 Diverse speeds for different motors 77
318/84 Field or secondary circuit control 9
318/68 Relative motor speed control 81

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8648553 Control of heavy machines Feb. 11, 2014
8513908 Fan speed control circuit Aug. 20, 2013
8497641 HDD with VCM back EMF and voltage control circuitry Jul. 30, 2013
8463480 Dual mode range extended electric vehicle Jun. 11, 2013
8463481 Dual mode range extended electric vehicle Jun. 11, 2013
8447449 Belt slip detection diagnostic May. 21, 2013
8424143 Electric toothbrush Apr. 23, 2013
8428806 Dual mode range extended electric vehicle Apr. 23, 2013
RE44060 Electric car control apparatus Mar. 12, 2013
8346419 Operation of a range extended electric vehicle Jan. 1, 2013
8299733 Methods for hybrid velocity control of at least partially resonant actuator systems and systems thereof Oct. 30, 2012
8294392 Arrangement for supplying power to a coupled system of machines Oct. 23, 2012
8274244 Actuator system and method for extending a joint Sep. 25, 2012
8265849 Drive system for electrically driven dump truck Sep. 11, 2012
8232750 Broad turndown ratio traction drive Jul. 31, 2012
8217613 System and method for driving a drawer of a refrigerator and refrigerator employing same Jul. 10, 2012
8212501 Systems and methods for dynamic fan speed control in an information handling system Jul. 3, 2012
8164295 Stepping motor controlling device, method, and storage medium Apr. 24, 2012
8133033 High voltage bus capacitor pre-charger circuit Mar. 13, 2012
8084967 Motor controller and printer Dec. 27, 2011
7993300 Method for ensuring constant speed of a motor in an injection device Aug. 9, 2011
7944157 Dual ring dedicated drive control system for medium voltage variable frequency drives May. 17, 2011
7944158 Controlled electric motor arrangement for a tension mechanism May. 17, 2011
7923944 Single processor dual motor control Apr. 12, 2011
7915850 Apparatus and method for controlling servomotor of electric injection molding machine Mar. 29, 2011
7863837 Drive system for electrically driven dump truck Jan. 4, 2011
7852021 Method and apparatus for minimizing forces on a web Dec. 14, 2010
7847494 Drive unit, preferably an actuator, a control and a construction Dec. 7, 2010
7847510 Controlling switching of thyristors to reduce power loss in variable speed motor Dec. 7, 2010
7834563 Dynamic antenna control in a wireless communication system Nov. 16, 2010
7808192 Heat dissipation system Oct. 5, 2010
7733037 Integrated skid with multiple-motor controller Jun. 8, 2010
7715964 Very low speed vehicle control algorithm operating in the spatial domain May. 11, 2010
7714524 System and method for controlling multiple DC fans May. 11, 2010
7683558 Electric car control apparatus Mar. 23, 2010
7679298 Locomotive wheel speed control Mar. 16, 2010
7671548 Electric drive system Mar. 2, 2010
7656107 Control circuit for an arrangement having at least two direct current motors that are connectable in parallel to a direct voltage system Feb. 2, 2010
7629756 Method and apparatus for controlling asynchronous motors Dec. 8, 2009
7602128 Device and method to configure same Oct. 13, 2009
7598687 Method and control unit for controlling fan motors Oct. 6, 2009
7561829 Motor control device, image forming apparatus, and motor control method Jul. 14, 2009
7550936 Fan motor drive control apparatus Jun. 23, 2009
7548034 Centrifuge Jun. 16, 2009
7538500 Position detection and external driver multiplexing system for DC motors May. 26, 2009
7538502 Motor driver circuit, control method thereof, and electronic apparatus May. 26, 2009
7525263 Control system Apr. 28, 2009
7525262 Automatic clothes dryer Apr. 28, 2009
7521881 Constant speed barrier operator Apr. 21, 2009
7518323 Motor driving device Apr. 14, 2009

1 2 3

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