Method and apparatus for heating electrical motors and like...

Details Method and apparatus for heating electrical motors and like... Method and apparatus for heating electrical motors and like...

G - Physics

05

B

342/12, 318/120

G05B 11/01 (2006.01) H02K 15/12 (2006.01)

Patent

CA 1093189

Abstract of the Disclosure A motor heat control circuit is provided for heating an electrical motor during the time of motor shutdown, with the circuit functioning to interconnect a winding of the motor with a source of alternating current voltage for substantially an entire half-cycle of the alternating current voltage but only at intervals comprising a selected plurality of cycles of the alternating current voltage. In its preferred form, the motor heat control circuit is adapted to be connected in shunt circuit with a main motor contactor normally interconnecting the motor winding with the source of alternating current voltage, and includes a controllable semi-conductor switch controlled by digital counting logic which is responsive to clock pulses developed from the alternating current voltage.

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