Design optimisation of ironless motors based on magnet selection

Greaves, Matthew C., Walker, Geoffrey R., & Walsh, Bernard B. (2001) Design optimisation of ironless motors based on magnet selection. In Proceedings of the Australasian Universities Power Engineering Conference (AUPEC-2001) : millennium power vision, Australasian Committe for Power Engineering, Perth, WA, pp. 216-220.

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Abstract

This paper considers the design of a radial flux permanent magnet ironless core brushless DC motor for use in an electric wheel drive with an integrated epicyclic gear reduction. The motor has been designed for a continuous output torque of 30 Nm and peak rating of 60 Nm with a maximum operating speed of 7000 RPM. In the design of brushless DC motors with a toothed iron stator the peak air-gap magnetic flux density is typically chosen to be close to that of the remanence value of the magnets used. This paper demonstrates that for an ironless motor the optimal peak air-gap flux density is closer to the maximum energy product of the magnets used. The use of a radial flux topology allows for high frequency operation and can be shown to give high specific power output while maintaining a relatively low magnet mass. Two-dimensional finite element analysis is used to predict the airgap flux density. The motor design is based around commonly available NdFeB bar magnet size

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ID Code: 63584
Item Type: Conference Paper
Refereed: Yes
Keywords: air gaps, brushless DC motors, DC motor drives, hybrid electric vehicles, magnetic flux, permanent magnet motors, stators
ISBN: 176067068X
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200) > Hybrid Vehicles and Powertrains (090205)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Industrial Electronics (090603)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2001 [please consult the author]
Deposited On: 04 Mar 2014 22:29
Last Modified: 06 Mar 2014 20:23

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