Mechanical degaussing for electric motors

Details Mechanical degaussing for electric motors Mechanical degaussing for electric motors

G - Physics

05

B

318/40

G05B 11/00 (2006.01) F24D 19/10 (2006.01) G05D 23/275 (2006.01)

Patent

CA 1112718

ABSTRACT A motor control apparatus is disclosed having an electric motor which is driven in one direction by an alter- nating current power source and in a return direction by a spring return wherein a holding or braking of the motor is accomplished by the application of direct current to magnetize the motor and hold it in a predetermined intermediate position after the removal of the alternating current power source. The level of direct current supplied to the motor for braking or holding is held low enough to allow the return spring to mechan- ically demagnetize or degauss the motor so that it will return to its initial position; i.e. the residual magnetism of the motor is kept small enough that the return spring can return the motor to its initial position. The motor control apparatus is partic- ularly adapted for use to control a three position water valve supplying water to one or both of two different areas or zones as required by area or zone thermostats.

308280

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