Time-delay start winding cut-out circuit for an electric motor

Details Time-delay start winding cut-out circuit for an electric motor Time-delay start winding cut-out circuit for an electric motor

H - Electricity

02

P

310/43, 318/72

H02P 1/42 (2006.01) H02K 11/00 (2006.01)

Patent

CA 1064573

ABSTRACT OF THE DISCLOSURE 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 con- nected 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 elec- tronic 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.

261449

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