Protective device for an electric motor

Details Protective device for an electric motor Protective device for an electric motor

1987-11-18

1988-08-30

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 58, 361 91, H02H 709

Patent

active

047681250

ABSTRACT:
A device for protecting a DC series electric motor from the voltage surge which occurs when the motor fields collapse. Electrical resistances are connected in parallel with the series field coils and the commutating field coils of the motor. The resistances safely absorb any voltage surge resulting from field collapse and also protect the motor from externally generated voltage spikes.

REFERENCES:
patent: 991787 (1911-05-01), Kouwenhover et al.
patent: 3894274 (1975-07-01), Rosenberry, Jr.
patent: 4041543 (1977-08-01), Pasculle et al.
patent: 4178617 (1979-12-01), Reichel
patent: 4340853 (1982-07-01), Braun et al.

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