Method and apparatus for testing electric motors

Details Method and apparatus for testing electric motors Method and apparatus for testing electric motors

1974-11-18

1976-06-29

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

322 99, G01R 3102

Patent

active

039671992

ABSTRACT:
To determine whether a motor is operative, where visual inspection of rotation is impossible or difficult, the motor is energized by connection to an AC source for a short interval to bring the motor to running speed. After lapse of the short interval the AC source is disconnected and the motor coasts to a stop. An AC detector determines that AC power has been terminated and closes a switch to connect a voltage detector to a memory. The voltage detector amplifies a residual EMF field generated while the motor is acting as a generator due to the presence of a residual magnetic field produced in the rotor during prior energization. The detected voltage sets the memory which energizes a motor rotation indicator.

REFERENCES:
patent: 2741738 (1956-04-01), Reid
patent: 3004205 (1961-10-01), Barritt et al.

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