Method and circuit for determining the speed of rotation of a ro

Details Method and circuit for determining the speed of rotation of a ro Method and circuit for determining the speed of rotation of a ro

1986-11-03

1989-06-13

Pellinen, A. D.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

318801, G01P 348

Patent

active

048395897

ABSTRACT:
A method is presented in which at least one of the sinusoidal voltages (U.sub.S) which is induced in the stator windings by the residual magnetism or remanence of the rotor in a rotating-field machine, the frequency of which corresponds to the rotor speed is converted into a symmetrical square wave signal, (U.sub.R), the frequency and the phase of this square wave signal (U.sub.R) matching with the frequency and the phase of the induced sinusoidal voltage (U.sub.S). From this square wave signal (U.sub.R), an output signal (U.sub.DA) proportional to the frequency thereof is generated. Thus, a method is obtained by which the time required for finding the operational speed of the rotating-field machine (2) is reduced considerably so that a frequency converter can be connected to the rotating-field machine (2) rapidly at a synchronous speed.

REFERENCES:
patent: 4410845 (1983-10-01), Lockyear

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