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Sensorless multiphase induction motor drive based on a speed observer operating with third-order field harmonics

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5 Author(s)
M. Mengoni ; Department of Electrical Engineering, University of Bologna, Italy ; L. Zarri ; A. Tani ; G. Serra
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This paper presents an electric drive consisting of a multiphase induction motor fed by multiphase inverter. The control system is similar to that of a traditional field-oriented control for three-phase motors, but the machine state is determined by a novel sensorless observer. Since multiphase motors with M phases (M is supposed odd) have the capability of controlling the spatial harmonics of the magnetic field up to the (M-2)th order, the proposed observer excites the third-order spatial harmonic of the magnetic field to estimate the rotor speed. Experimental results are provided to show the feasibility of the electric drive.

Published in:

2011 IEEE Energy Conversion Congress and Exposition

Date of Conference:

17-22 Sept. 2011