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Optimal Selection of Rotor Bar Number in Multiphase Cage Induction Motors

Joksimovic, G, Mezzarobba, M, Tessarolo, A and Levi, E (2020) Optimal Selection of Rotor Bar Number in Multiphase Cage Induction Motors. IEEE Access. ISSN 2169-3536

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Rules for the selection of rotor bar numbers which minimize current and torque ripples are derived in this paper for a general symmetrical multiphase cage induction machine with prime phase number and integral slot winding. Analytically obtained expressions for optimal rotor bar number selection are validated by means of totally independent simulations, one based on a parameterized winding function (PWF) model of the induction machine and the other employing time-stepping finite element analysis (TSFEA). As a case study, five-phase four-pole cage induction motors with forty stator slots and different number of rotor bars are comparatively analyzed. Results obtained from the PWF model are in excellent accordance with those independently obtained by TSFEA and both confirm the correctness of the proposed selection criteria. The practical motivation of the study is that an incorrect selection of rotor bar number can lead to parasitic torques of significant amplitude and, presently, there are no general rules available in the literature which may guide designers towards an optimal design choice for a general number of phases.

Item Type: Article
Uncontrolled Keywords: 08 Information and Computing Sciences, 09 Engineering, 10 Technology
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Electronics & Electrical Engineering (merged with Engineering 10 Aug 20)
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date Deposited: 26 Jun 2020 10:56
Last Modified: 04 Sep 2021 07:06
DOI or ID number: 10.1109/ACCESS.2020.3004685
URI: https://researchonline.ljmu.ac.uk/id/eprint/13196
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