Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1979-03-15
1982-04-13
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318783, 318791, H02P 144
Patent
active
043250122
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 inductively coupled to the motor windings and supplies current to operate the time delay means. The time delay means operates 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 self heating, heat responsive device, and the components are sized and arranged to optimize the heat generation and dissipation properties and thereby obtain the desired operating characteristics.
REFERENCES:
patent: 3213239 (1965-10-01), Bodge
patent: 3307093 (1967-02-01), Wright
patent: 3421064 (1969-01-01), Phillips
patent: 3586939 (1971-06-01), Buiting
patent: 3683250 (1972-08-01), Fricker
patent: 3766457 (1973-10-01), Fink, Jr. et al.
Franklin Electric Co. Inc.
Rubinson Gene Z.
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