Electrical Machine Rotor Shielding for Low Cost Electrical Drive

Al-Ani, M.M.J.; Vakil, G.; Gerada, C.

Abstract

Electrical machine rotor shielding has been proposed for high-speed electrical machines, i.e. ≥50krpm, where a smooth current waveform becomes difficult and costly to generate due to the required high switching frequency. The rotor shielding is used to suppress the unsynchronized low order high amplitude current harmonics and consequently reduces the induced eddy-current losses in rotor. For moderate speed machines, 10-40krpm, generally suited for automotive applications, a smooth current waveform is possible to generate, however, fast switching devices are required that increases the overall drive cost. In the paper, a feasibility study of low cost electrical drive is presented. The electrical drive consists of low cost, low switching frequency modules to generate a pulse width modulation (PWM) current waveform with a few switching pulses, and a rotor with electromagnetic shield to reduce the losses to an acceptable level. The feasibility study includes two permanent magnet machines (PMMs) with different rotors. Multi-physics results are obtained and compared to illustrate the feasibility of the proposed drive.

Citation

Al-Ani, M., Vakil, G., & Gerada, C. (2018, June). Electrical Machine Rotor Shielding for Low Cost Electrical Drive. Presented at 2018 IEEE Transportation and Electrification Conference and Expo, ITEC 2018, Long Beach, California, USA

• Presentation Conference Type: Edited Proceedings
• Conference Name: 2018 IEEE Transportation and Electrification Conference and Expo, ITEC 2018
• Start Date: Jun 13, 2018
• End Date: Jun 15, 2018
• Acceptance Date: Jun 13, 2018
• Publication Date: Aug 30, 2018
• Deposit Date: Oct 30, 2018
• Publicly Available Date: Oct 31, 2018
• Publisher: Institute of Electrical and Electronics Engineers
• Pages: 38-43
• Book Title: 2018 IEEE Transportation Electrification Conference and Expo (ITEC)
• ISBN: 978-1-5386-3049-5
• DOI: https://doi.org/10.1109/ITEC.2018.8450226
• Keywords: Shielding; harmonics; low cost; surface-mounted permant magnet machine; SPM; soild rotor; low siwtching frequancy
• Public URL: https://nottingham-repository.worktribe.com/output/1211308
• Publisher URL: https://ieeexplore.ieee.org/document/8450226
• Additional Information: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
• Contract Date: Oct 30, 2018