Protective system for electric motors

Details Protective system for electric motors Protective system for electric motors

1980-05-29

1983-01-04

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

340648, 361 23, H02H 708

Patent

active

043675069

ABSTRACT:
A low winding resistance protective system for electrical motors comprising sensing apparatus for coupling to at least one motor winding and for comparing the winding resistance of a motor when at rest to a predetermined threshold and for providing an output indication in response to exceedance of that threshold and decoupling apparatus for decoupling the at least one motor winding from the sensing apparatus such that high voltages applied to the at least one motor winding during operation of the motor are prevented from reaching the sensing apparatus. An embodiment particularly suitable for use with high voltage motors is also described.

REFERENCES:
patent: 3611036 (1971-10-01), Edson
patent: 3656136 (1972-04-01), Blair

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