Electric motor direction indicating device

Details Electric motor direction indicating device Electric motor direction indicating device

1976-03-09

Trafton, David L.

Communications: electrical

Systems

Call station

318490, 324 34R, 324158MG, G01B 700

Patent

active

039435040

ABSTRACT:
A direction indicating device for indicating the direction of rotation of a polyphase A.C. electric motor. A polyphase energy source having a frequency higher than the operating frequency of the electric motor impresses a rotating electromagnetic field in the windings of the motor. A pair of coil detectors, spaced a predetermined electrical distance apart, detects the rotating electromagnetic field and determines the direction of rotation of the electromagnetic field. The direction of rotation of the electromagnetic field, which is the same as the rotation of the electric motor, is displayed on a display apparatus.

REFERENCES:
patent: 2669126 (1954-02-01), Simmons et al.
patent: 2786978 (1957-03-01), Warner
patent: 2924773 (1960-02-01), Lykke
patent: 3111841 (1963-11-01), Gray
patent: 3120655 (1964-02-01), Beason et al.
patent: 3123818 (1964-03-01), Steele
patent: 3188620 (1965-06-01), MacCallum

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