A Parallel Speed and Rotor Time Constant Identification Scheme for Indirect Field Oriented Induction Motor Drives

PROJECT TITLE :

A Parallel Speed and Rotor Time Constant Identification Scheme for Indirect Field Oriented Induction Motor Drives

ABSTRACT:

Rotor time constant identification is critical for top-performance indirect field oriented control of induction motor drives. Meanwhile, speed sensorless technique has several advantages like low price and reduced hardware complexity. Lately, the estimation strategies for motor speed have respectively grown to maturity, however the analysis within the identification of rotor time constant remains to be extended. In this paper, an online theme for parallel motor speed and rotor time constant identification is proposed in line with parameter features, with the operating frequencies of all modules carefully considered. First, the speed is estimated via rotor slot harmonic extraction technique. On the premise of estimated speed, a derivative form of induction motor model is proposed for rotor time constant identification, which overcomes the issues of pure integration in rotor flux calculation. Correspondingly, instead of rotor flux, derivative rotor flux is used in the proposed model. Finally, an adjusted particle swarm optimization method is utilized on the proposed model to track the rotor time constant. The robustness and effectiveness of the proposed theme have been validated experimentally.

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