A NEW MOTOR SPEED MEASUREMENT ALGORITHM BASED ON ACCURATE SLOT HARMONIC SPECTRAL ANALYSIS
M. Aiello, A. Cataliotti, S. Nuccio
Abstract:
In this paper a new induction motor speed method based on Chirp-Z Transform and zero padding of the supply current is presented. The algorithm has been implemented on a microprocessor. A virtual instrument has been built to control and to monitor on line motor speed. The motor speed method has been tested on a 7.5 kW induction motor driven by a pulse width modulation voltage source inverter for different load and supply frequency conditions. The proposed method has been compared to a FFT based one implemented on the same microprocessor. Thanks to a shorter sampling time window errors related to not stationary current signal are reduced. Then the achieved goal is an increased accuracy due to shorter sampling time window and better spectral resolution. Moreover the processing time has been reduced increasing algorithm speed response.
Keywords:
speed measurement, encoderless, rotor slot harmonics, Chirp-Z Transform, virtual instrument
Download:
IMEKO-TC4-2001-044.pdf
DOI:
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Event details
IMEKO TC:
TC4
Event name:
TC4 Symposium 2001
Title:

11th IMEKO TC4 Symposium on Trends in Electrical Measurements and Instrumentation (together with 6th IMEKO TC4 Workshop on ADC Modelling and Testing)

Place:
Lisbon, PORTUGAL
Time:
13 September 2001 - 14 September 2001
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