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Class Information
Number: 318/772
Name: Electricity: motive power systems > Induction motor systems > Primary circuit control > Plural speed
Description: Subject matter wherein the primary member comprises a plurality of windings or winding portions and the circuit includes means connected to the windings or winding portions to cause the motor to rotate at several nominal discrete speeds.

Sub-classes under this class:

Class Number Class Name Patents
318/773 Pole changing 67

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8598836 Star-delta many levels starter for an AC induction motor Dec. 3, 2013
8487572 Brushless three phase motor drive control based on a delta zero crossing error Jul. 16, 2013
8487580 Blower motor for HVAC systems Jul. 16, 2013
8446119 Controlling an electric motor by dynamic switching May. 21, 2013
8436566 Multi-speed control apparatus for fan motor May. 7, 2013
8415910 Switch module for an electric machine having switchable stator windings Apr. 9, 2013
8390240 Absolute position sensor for field-oriented control of an induction motor Mar. 5, 2013
8378618 Systems and methods for controlling operations of a motor Feb. 19, 2013
8373378 Systems and method for motor speed control Feb. 12, 2013
8368330 Energy-recovery device in a variable speed drive Feb. 5, 2013
8362737 Blower motor for HVAC systems Jan. 29, 2013
8362736 Blower motor for HVAC systems Jan. 29, 2013
8269450 Winding switching apparatus and winding switching system Sep. 18, 2012
8248020 Starting circuit for single-phase AC motor Aug. 21, 2012
8198853 Motor speed controller Jun. 12, 2012
8193744 Method and apparatus for quiet fan speed control Jun. 5, 2012
8049459 Blower motor for HVAC systems Nov. 1, 2011
8030870 Method and device for reducing the influence of a DC component in a load current of an asynchronous three-phase motor Oct. 4, 2011
8008882 Rotation speed controlling system for shredder motor Aug. 30, 2011
7911175 Two speed induction motor with tapped auxiliary winding Mar. 22, 2011
7872440 Controller of electric motor Jan. 18, 2011
7848067 Soft start motor control using back-EMF Dec. 7, 2010
7746025 Variable speed motor Jun. 29, 2010
7683561 Device for the incremental control of a direct-current motor for the cooling fan of a motor vehicle Mar. 23, 2010
7671549 Method and apparatus for quiet fan speed control Mar. 2, 2010
7633254 Single phase motor driving device Dec. 15, 2009
7579804 Method to measure the angular speed of an induction motor Aug. 25, 2009
7521882 Control device and method of motor Apr. 21, 2009
7474074 Variable speed induction motor with wye-delta switching with reduced drive volt-amp requirement Jan. 6, 2009
7446500 Method for operating a programmable washing machine Nov. 4, 2008
7420351 Power-factor correction device for variable speed drive Sep. 2, 2008
7408320 Apparatus for power control by phase gating and a method for harmonic reduction Aug. 5, 2008
7382103 Magnetic gearing of permanent magnet brushless motors Jun. 3, 2008
7279864 Control unit for driving a regulating transistor of a fan arrangement Oct. 9, 2007
7271565 Apparatus for controlling speed of fan motor of air-conditioner Sep. 18, 2007
7239109 Single-phase induction motor Jul. 3, 2007
7202627 Load and speed sensitive motor starting circuit and method Apr. 10, 2007
7196490 Variable speed motor Mar. 27, 2007
7138772 Electrically movable vehicle and control program for driving electrically movable vehicle Nov. 21, 2006
7095209 Method and apparatus to regulate torque provided to loads Aug. 22, 2006
7091691 Variable speed motor Aug. 15, 2006
7075255 Variable speed controller for a family of multi-tap motors Jul. 11, 2006
7045979 Multiple-speed electric machine and method of operating the same May. 16, 2006
7034500 Electric drive assembly Apr. 25, 2006
6997002 Air conditioning unit and method of operating the same Feb. 14, 2006
6946815 Switch for a variable-speed induction motor Sep. 20, 2005
6900614 Rotation speed search apparatus for increasing an output voltage of an inverter and method thereof May. 31, 2005
6864659 Variable speed controller for air moving applications using an AC induction motor Mar. 8, 2005
6815926 Single phase induction motor with partially shared windings Nov. 9, 2004
6815925 Systems and methods for electric motor control Nov. 9, 2004

1 2 3

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