The Iron Loss Analysis of Direct-driving External-rotor Motor with Cobalt-iron Alloy

Chengming Zhang, Jiangpeng Zhang, Jiwei Cao, Liyi Li, Mingyi Wang, Jie Zhao

Abstract


In this paper, the iron loss characteristics of an External Rotor Permanent Magnet Synchronous Motor (ER-PMSM) for direct-driving of electric vehicle is analyzed in detail. As a kind of cobalt-iron alloy, whose saturation magnetic density is about 2.4 Tesla, is adopted to manufacture the iron core, the experimental platform has been established to test the B-H curve and the iron loss characteristics of the alloy, firstly. According to the characteristics of iron loss coefficient varying with frequency, a variable coefficient orthogonal decomposition iron loss model is proposed. Then, a magnetic loss calculation model based on cobalt-iron alloy is established. The empirical coefficient of iron loss is re-corrected, and the analysis model of the iron loss is obtained. Finally, the experimental platform is set and a prototype of ERPMSM is manufactured. The iron loss of the stator with cobalt-iron alloy is tested. The experimental results agree well with the numerical results and the calculated results, which verify the correctness of the theoretical analysis.

Keywords


external-rotor motor, direct-driving motor, iron loss model, high efficiency motor


DOI
10.12783/dteees/iceee2018/27877

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