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Design studies on a new outer-rotor permanent magnet flux switching machine with hybrid excitation flux for in-wheel drive EV applications

Ahmad, Md Zarafi and Sulaiman, Erwan and Haron, Zainal Alam and Kosaka, Takashi (2012) Design studies on a new outer-rotor permanent magnet flux switching machine with hybrid excitation flux for in-wheel drive EV applications. In: 5th International Conference on Postgraduate Education (ICPE-5 2012), Universiti Teknologi Malaysia, Skudai, 18-19 December 2012.


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Recently, in-wheel motors are among the attractive research topics on pure electric vehicles (EVs) propulsion systems. This because of they offer great controllability for each independent wheel as well as provide more cabin space due to elimination of mechanical transmission and differential gears. Moreover, more series batteries can be installed to increase the driving range percharge. Since the motors are attached directly to wheel, it is required to have high torque densityand efficiency. Thus, this paper presents design study on a new structure of outer-rotor permanent magnet flux switching synchronous machine (PMFSM) with hybrid excitation flux for in-wheel EV propulsion system. The proposed machine consists of 12 slots of stator poles, 10 rotor poles, and all the active parts are located on the stator. In addition, it has a robust rotor structure which only comprises a single piece of rotor and has the ability of a wide range flux control. Under some design restrictions and specifications for the target EV drive applications, the initial performances of the proposed machine in terms of flux-linkage, cogging torque, back-emf voltages, and magnetic flux density distribution are evaluated based on 2-D finite element analysis (FEA). The predicted performances show that the proposed machine has viability to be applied for in-wheel drive applications however design refinement is required to achieve the target specifications.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2000-2891 Dynamoelectric machinery and auxiliaries
Divisions: Faculty of Electrical and Electronic Engineering > Department of Electrical Power Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 07 Apr 2015 04:46
Last Modified: 07 Apr 2015 04:46
URI: http://eprints.uthm.edu.my/id/eprint/5864
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