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Class Information
Number: 388/808
Name: Electricity: motor control systems > Closed loop speed control system for dc motor with commutator > Field control, or field and armature control, by analog (only) circuitry > By selection of windings
Description: Subject matter wherein running speed is controlled by selecting the windings of the motor field, or armature, or both, which receive energization.

Patents under this class:

Patent Number Title Of Patent Date Issued
8415911 Power tool with a DC brush motor and with a second power source Apr. 9, 2013
7983539 Control circuit for fan Jul. 19, 2011
6891346 Commutation and velocity control system for a brushless DC motor May. 10, 2005
6408130 Electric drive system with an electronically commuted DC motor in order to reduce torque irregularities Jun. 18, 2002
5841358 Motor current status sensor Nov. 24, 1998
5455885 Method and apparatus for starting a sensorless polyphase DC motor in dual-coil mode and switching to single coil mode at speed Oct. 3, 1995

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