Sensorless speed measurement of induction machines using Short Time Fourier Transformation

Author

Wang, C. ; Zhou, Z. ; Unsworth, P.J. ; O´Farrell, T.

Author_Institution

Inst. of Adv. Telecommun. (IAT), Swansea Univ., Swansea

fYear

2008

fDate

11-13 June 2008

Firstpage

1114

Lastpage

1119

Abstract

Sensorless speed measurement of induction machines using short time Fourier transformation (STFT) is presented in this paper. The sensorless speed information of induction motors was derived from space vector angular fluctuation which is obtained from stator current by exploring the position of the current space vector in the space vector plane. By applying STFT to the space vector angular fluctuation signals, the eccentricity associated motor speed information can be extracted. Interpolation technique has been used to improve the accuracy of the STFT. The method has been verified on an ABB 2-pole squirrel-cage induction motor in laboratory in the case of motor starting; very good agreement has been achieved between the estimated speed and the actually measured speed.

Keywords

Fourier transforms; angular velocity measurement; interpolation; machine testing; squirrel cage motors; starting; ABB 2-pole squirrel-cage motor; current space vector; induction machines; interpolation technique; motor starting; sensorless speed measurement; short-time Fourier transformation; space vector angular fluctuation; stator current; Data mining; Design engineering; Fluctuations; Induction machines; Induction motors; Power engineering and energy; Rotors; Signal analysis; Synchronous motors; Velocity measurement; Induction machines; STFT; sensorless speed measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics, Electrical Drives, Automation and Motion, 2008. SPEEDAM 2008. International Symposium on

Conference_Location

Ischia

Print_ISBN

978-1-4244-1663-9

Electronic_ISBN

978-1-4244-1664-6

Type

conf

DOI

10.1109/SPEEDHAM.2008.4581114

Filename

4581114