Apparatus for testing the performance of electric motors

Details Apparatus for testing the performance of electric motors Apparatus for testing the performance of electric motors

1977-07-18

1978-05-30

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

324158MG, G01D 116

Patent

active

040916626

ABSTRACT:
Apparatus for testing the performance of electrical machines by producing a direct digital readout and display of per unit rotor slip in electrical motors from no load condition through loads in excess of maximum rated load. The apparatus includes speed sensing means for detecting the rotor speed of the motor under test and means for producing a voltage output that is proportional to the rotor speed. A reference voltage is developed by sensing the frequency of the input voltage to the motor under test. The difference between these two signals, representing the actual rotor speed and the synchronous rotor speed, is divided by the reference voltage to produce the per unit slip of the motor under test.

REFERENCES:
patent: 3525026 (1970-08-01), Ahamed
patent: 3596511 (1971-08-01), Hart

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