Methods and apparatuses for detecting the speed of an asynchrono

Details Methods and apparatuses for detecting the speed of an asynchrono Methods and apparatuses for detecting the speed of an asynchrono

1981-03-24

1982-11-09

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

318312, G01P 356

Patent

active

043587348

ABSTRACT:
For determining the speed of an asynchronous motor use is made of the most manifest tone in the frequency spectrum beneath an overtone to the basic tone of the motor current. The frequency difference between the overtone and the tone in the subjacent frequency spectrum is determined, and thereby the slip and speed of the motor can also be established.

REFERENCES:
patent: 4194129 (1980-03-01), Dumbeck
Zimmerman, Measuring Frequency Deviation, Electronic Industries, Jun. 1965, pp. 100, 101, 107.

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