Motor starting and protecting apparatus

Details Motor starting and protecting apparatus Motor starting and protecting apparatus

1998-06-09

2000-08-01

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337365, 337362, 337380, 337398, 337336, 337338, 337343, 318783, 318778, 318785, 318791, H01H 3754, H01H 3732, H02P 142, H02P 126

Patent

active

060972750

ABSTRACT:
A motor starting device (1) has a thermostatic element (14) of a first switch circuit (11), a first resistive heater (13) serially connected to the first switch circuit, a thermostatic element (22) of a second switch circuit (21) and a second resistive heater (23) serially connected to the second switch circuit. The thermostatic element (22) of the second switch circuit is heated by both the first and second resistive heaters and, after actuation, is closer to the first resistive heater (13), thereby bringing the second switch circuit (23) into a de-energized state. When the second switch circuit (21) and the second resistive heater (23) are employed in the motor starting device, it becomes possible to provide a large electric current to the start winding during the start-up phase and to make the electric current that flows to the start winding zero after the start-up phase.

REFERENCES:
patent: 2117123 (1938-05-01), Werner
patent: 2451535 (1948-10-01), Clark
patent: 3521138 (1970-07-01), Enemark et al.

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