Applications of the FFT to the speed measurement of inverter fed induction motors

Author

Ferrah, A. ; Bradley, K.J. ; Asher, G.M.

Author_Institution

Dept. of Electr. & Electron. Eng., Nottingham Univ., UK

fYear

1992

fDate

12-14 May 1992

Firstpage

647

Lastpage

652

Abstract

An alternative to the analog techniques and devices used in detecting the speed of induction motors in adjustable-speed drives is presented. The method involves digital processing of one stator phase current in order to retrieve the speed information contained in the slot-ripple harmonics, using FFT-based spectral analysis. A noninvasive digital speed detector, suitable for steady-state operation, was developed. The detector is designed around an Intel/80386-based microcomputer. Its performance with and without load over a wide range of speeds is reported

Keywords

computer aided analysis; computerised instrumentation; electric drives; fast Fourier transforms; harmonic analysis; induction motors; microcomputer applications; power engineering computing; signal processing equipment; spectral analysis; velocity measurement; FFT; Intel/80386; adjustable-speed drives; digital processing; inverter fed induction motors; microcomputer; noninvasive digital speed detector; slot-ripple harmonics; spectral analysis; speed measurement; stator phase current; Detectors; Induction motors; Information retrieval; Inverters; Microcomputers; Spectral analysis; Stators; Steady-state; Variable speed drives; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 1992. IMTC '92., 9th IEEE

Conference_Location

Metropolitan, NY

Print_ISBN

0-7803-0640-6

Type

conf

DOI

10.1109/IMTC.1992.245059

Filename

245059