Sensorless speed measurement using current harmonic spectral estimation in induction machine drives

This paper proposes a sensorless speed measurement scheme which improves the performance of transducerless induction machine drives, especially for low frequency operation. Speed-related harmonics which arise from rotor slotting and eccentricity are analyzed using digital signal processing. These cu...

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Main Authors: Hurst, K.D., Habetler, T.G.
Format: Conference Proceeding
Language:English
Subjects:
Digital signal processing
Fast Fourier transforms
Filtering
Frequency
Harmonic analysis
Induction machines
Power harmonic filters
Signal analysis
Stator windings
Velocity measurement
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Habetler, T.G.
description This paper proposes a sensorless speed measurement scheme which improves the performance of transducerless induction machine drives, especially for low frequency operation. Speed-related harmonics which arise from rotor slotting and eccentricity are analyzed using digital signal processing. These current harmonics exist at any nonzero speed and are independent of time-varying parameters such as stator winding resistance. A spectral estimation technique combines multiple current harmonics to determine the rotor speed with more accuracy and less sensitivity to noise than analog filtering methods or the fast Fourier transform. An on-line initialization routine determines machine-specific parameters required for slot harmonic calculations. This speed detector, which has been verified at frequencies as low as 1 Hz, can provide robust, parameter-independent information for parameter tuning or as an input to a sensorless flux observer for a field-oriented drive. The performance of the algorithm is demonstrated over a wide range of inverter frequencies and load conditions.< >
doi_str_mv 10.1109/PESC.1994.349756
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Digital signal processing
Fast Fourier transforms
Filtering
Frequency
Harmonic analysis
Induction machines
Power harmonic filters
Signal analysis
Stator windings
Velocity measurement
title Sensorless speed measurement using current harmonic spectral estimation in induction machine drives
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