A precise induction motor speed estimator, based on a fixed carrier frequency signal

Author

Dixon, Juan W. ; Rivarola, Jose N.

Author_Institution

Dept. of Electr. Eng., Univ. Catolica de Chile, Santiago, Chile

fYear

1994

fDate

25-27 May 1994

Firstpage

199

Lastpage

203

Abstract

A speed estimation method, based on the introduction of a constant frequency carrier signal, is presented. This frequency carrier signal produces a constant speed rotating field from which the speed information in a wide range is obtained. The speed is estimated through the detection of irregularities in the rotor. These irregularities generate frequency pulsations proportional to the rotor speed, which are independent of the parameters of the machine. Because these signals are extremely low, special electronic circuits, implemented with analog multipliers and filters, have been designed, and they are able to measure very low speed values. Computer simulations and some experiments have been carried out, and they have shown that it is possible to measure speeds as low as 20 RPM

Keywords

digital simulation; electric machine analysis computing; filters; induction motors; multiplying circuits; parameter estimation; velocity measurement; analog multipliers; computer simulations; constant frequency carrier signal; constant speed rotating field; electronic circuits; filters; fixed carrier frequency signal; frequency pulsations; induction motor speed estimator; rotor irregularities detection; speed estimation method; speed measurement; Electronic circuits; Filters; Frequency estimation; Frequency measurement; Induction motors; Inverters; Rotors; Signal design; Signal generators; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 1994. Symposium Proceedings, ISIE '94., 1994 IEEE International Symposium on

Conference_Location

Santiago

Print_ISBN

0-7803-1961-3

Type

conf

DOI

10.1109/ISIE.1994.333156

Filename

333156