Motor control circuit with automatic restart of cut-in

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

1985-05-21

1987-04-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318778, H02P 142

Patent

active

046581952

ABSTRACT:
A control circuit (10) is provided for automatically re-applying starting torque to a single phase AC induction motor by reconnecting the auxiliary or starting winding (2) to the AC power source (3) if the motor has not accelerated to a given cut-out speed, or otherwise begins to stall. Multiple reconnections of the auxiliary winding (2) are automatically provided as needed, without external intervention, to provide multiple bumping action. The auxiliary winding (2) is connected to the AC source (3) during initial energization of the motor, and is disconnected after a given starting interval. Induced voltage in the auxiliary winding (2) is sensed and compared against a reference voltage (17) for reconnecting the auxiliary winding (2) 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.

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