Title :
A high accuracy FFT algorithm for induction motor sensor-less speed estimation
Author :
Li, Qianxiang ; Hu, Jingtao
Author_Institution :
Key Lab. of Ind. Inf., Chinese Acad. of Sci., Shenyang
Abstract :
As the effects of power systempsilas frequency fluctuation and harmonics, errors are unavoidable when using the FFT to analyze the induction motor current signal. In order to saving the problem of frequency leakage and error of the FFT, the polynomial approximation method is employed to obtain simple formulas for frequency correction. This paper is aimed at using the frequency correction to estimate the slot harmonic frequency of induction motorpsilas stator current and realize the motor sensor-less speed estimation. By this method the disturbance of the frequency leakage and the noise can be reduced and the accuracy of the harmonic analysis can be improved. Experiment verifies the methodpsilas validity.
Keywords :
fast Fourier transforms; harmonic analysis; induction motors; polynomial approximation; power systems; fast Fourier transforms; frequency correction; frequency leakage; harmonic analysis; harmonic frequency; high accuracy FFT algorithm; induction motor sensorless speed estimation; polynomial approximation method; power system frequency fluctuation; stator current; Approximation methods; Error correction; Fluctuations; Frequency estimation; Harmonic analysis; Induction motors; Polynomials; Power system analysis computing; Power system harmonics; Signal analysis;
Conference_Titel :
Electrical Machines and Systems, 2008. ICEMS 2008. International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-3826-6
Electronic_ISBN :
978-7-5062-9221-4
