Motor control circuit with automatic restart or cut- in

Details Motor control circuit with automatic restart or cut- in Motor control circuit with automatic restart or cut- in

H - Electricity

02

P

318/72

H02P 1/42 (2006.01)

Patent

CA 1241366

Abstract A control circuit is provided for auto- matically re-applying starting torque to a single phase AC induction motor by reconnecting the auxiliary or starting winding to the AC power source if the motor has not accelerated to a given cut-out speed, or otherwise begins to stall, Multiple reconnections of the auxiliary winding are automatically provided as needed, without external intervention, to provide multiple bumping action. The auxiliary winding is connected to the AC source during initial energiza- tion of the motor, and is disconnected after a given starting interval, Induced voltage in the auxiliary winding is sensed and compared against a reference voltage for reconnecting the auxiliary winding when the sensed auxiliary winding voltage drops below a given value relative to the reference voltage. The disconnecting, sensing and reconnecting functions are accomplished with a minimum number of components.

490210

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