Control circuit for two-speed single phase motor

Details Control circuit for two-speed single phase motor Control circuit for two-speed single phase motor

H - Electricity

02

P

318/71

H02P 1/44 (2006.01)

Patent

CA 1066760

ABSTRACT OF THE DISCLOSURE A control circuit for a two-speed single-phase motor as used in a hermetic refrigerant compressor which includes a control for preventing welding of the start relay contacts of the start relay means by electrical discharge from the run capacitor. In one aspect of the invention, a discharge path is provided for the run capacitor by switches and an auxiliary contactor. In another and preferred aspect of the invention, a negative temperature coefficient thermistor is used in series with and between the start capacitor and the start relay contacts for limiting the current to the start windings from a source of power and for limiting the current dis- charged into the start capacitor from the run capacitor after the motor is deenergized.

269593

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