Start winding cut-out circuit for an electric motor

Details Start winding cut-out circuit for an electric motor Start winding cut-out circuit for an electric motor

1978-11-16

1981-09-29

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 71, H02K 1100

Patent

active

042925550

ABSTRACT:
This disclosure deals with a time delay cut-out circuit for the start winding of an AC electric motor. The circuit includes an electronic switch which is connected in series with the start winding and which may be selectively closed to energize the start winding. Time delay means is provided which in response to current flow therethrough, provides a timing period. An auxiliary coil is wound on the motor stator and supplies current to operate the time delay means. The electronic switch is connected to respond to the time delay means which closes the electronic switch to energize the start winding during the timing period. The components of the circuit, except for the coil, are mounted in a capsule which may be plugged into the motor from the exterior of the stator. The time delay means includes a heat responsive device, and the components are sized and arranged in the capsule to optimize the heat generation and dissipation properties and thereby obtain the desired operating characteristics.

REFERENCES:
patent: 2776385 (1957-01-01), Modrey
patent: 2944297 (1960-07-01), Maynard
patent: 3168661 (1965-02-01), Rini
patent: 3308316 (1967-03-01), Pfahl

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