Title :
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
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;
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
DOI :
10.1109/SPEEDHAM.2008.4581114
