System and method for detecting fault conditions in a direct cur

Details System and method for detecting fault conditions in a direct cur System and method for detecting fault conditions in a direct cur

1995-06-07

1997-03-18

Nguyen, Vinh P.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

318490, 340648, G05B 1940

Patent

active

056126298

ABSTRACT:
Apparatus and method are provided for determining indicating if certain types of circuit failures have occurred in a D.C. motor circuit such as a locked rotor condition, a short-circuit or an open circuit. The method includes the steps of, and the apparatus involves, applying a voltage to two leads of the D.C. motor sufficient to cause motor rotation, determining if flyback exists, determining if back EMF exists, and, finally, if a back EMF does not exist and flyback does exist then indicating a locked rotor condition. However, if a back EMF does not exist and flyback does not exist then an indication is provided that either an open-circuit or short-circuit condition exists. The same apparatus and method can be used with a voltage not sufficient to cause motor rotation, although given this limitation only flyback can be detected, so that only an open-circuit or short-circuit condition can be indicated.

REFERENCES:
patent: 2568406 (1951-09-01), Packer et al.
patent: 4422040 (1983-12-01), Raider et al.
patent: 4574225 (1986-03-01), Pershall et al.

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