Combination starter-protector device, method of protecting a dyn

Details Combination starter-protector device, method of protecting a dyn Combination starter-protector device, method of protecting a dyn

1976-06-07

1978-04-11

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 27, 361 29, 318221H, 318473, H02H 708

Patent

active

040842029

ABSTRACT:
A method of protecting auxiliary winding means and main winding means in a winding circuit of a dynamoelectric machine in the event of a current overload. In this method, means is actuated in response to a preselected thermal condition accompanying the current overload for interrupting the winding circuit. Heat is transmitted from means for controlling starting of the dynamoelectric machine to the interrupting means for generally maintaining the winding circuit effectively interrupted for at least a predetermined period, and the starting controlling means is operable generally in response to current flow therethrough to increase its resistance generally as a function of its temperature for impeding the current flow therethrough to the auxiliary winding means at a preselected speed of the dynamoelectric machine.
A combination starter-protector device, a method of operating a dynamoelectric machine, and a circuit are also disclosed.

REFERENCES:
patent: 2771528 (1956-11-01), Moran
patent: 3434089 (1969-03-01), Waseleski, Jr. et al.
patent: 3695054 (1972-10-01), Barry

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