DocumentCode :
2663351
Title :
Sensorless speed measurement of induction motors
Author :
Micheletti, Roberto
Author_Institution :
Dept. of Electr. Syst. & Autom., Pisa Univ., Italy
fYear :
2003
fDate :
4-6 Sept. 2003
Firstpage :
67
Lastpage :
72
Abstract :
The paper deals with the accurate slip measurement of induction motors. The proposed procedure uses a noninvasive slip measurement scheme based on digital filtering and dynamic parameter estimation. The slip measurement is carried out without speed sensor and is deduced analyzing the magnetic field harmonics spectrum in proximity of the induction motor. First the EMF induced waveform, taken from a searching coil, is filtered using algorithms based on the discrete Fourier transform. Then the stator frequency and rotor frequency are obtained by comparing the filtered voltage with a mathematical model using an optimization procedure. The model´s parameters are varied until an adequate match is obtained with the filtered voltage. Experimental results are presented to validate this method.
Keywords :
discrete Fourier transforms; filtering theory; frequency measurement; induction motors; parameter estimation; slip (asynchronous machines); velocity measurement; EMF induced waveform; digital filtering; discrete Fourier transform; dynamic parameter estimation; induction motors; magnetic field harmonics spectrum; noninvasive slip measurement; sensorless speed measurement; Digital filters; Filtering; Frequency; Induction motors; Magnetic field measurement; Magnetic sensors; Magnetic separation; Parameter estimation; Velocity measurement; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Intelligent Signal Processing, 2003 IEEE International Symposium on
Print_ISBN :
0-7803-7864-4
Type :
conf
DOI :
10.1109/ISP.2003.1275815
Filename :
1275815
Link To Document :
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