Title :
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
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;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1992. IMTC '92., 9th IEEE
Conference_Location :
Metropolitan, NY
Print_ISBN :
0-7803-0640-6
DOI :
10.1109/IMTC.1992.245059
