Parasitic Rotor Losses in a Brushless Permanent Magnet Traction Machine

N. Schofield, K. Ng, Z. Q. Zhu, D. Howe

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

29 Citations (Scopus)

Abstract

The paper reports on experimental and theoretical investigations into parasitic loss experienced in the rotor of a prototype 150 Nm, 45 kW at 3 krpm, brushless permanent magnet machine having inset, sintered NdFeB, rotor magnets and designed as the traction drive machine for a hybrid electric vehicle. The experimental investigation identifies and quantifies loss trends for the prototype machine as a function of machine stator current excitation and shaft speed, while the theoretical work aims to expand the understanding of the loss mechanisms to enable the formulation of design criteria for loss minimization. The theoretical investigation employs simplifying assumptions that enable the calculation of loss via a number of 2-D finite element magneto-static field solutions however, such an approach is time consuming, hence the development of an analytic solution for the 2-D field distribution at the machine airgap has been implemented. Experimental and predicted results are presented for a inset rotor topology machine controlled via a pwm and overmodulated inverter operating a brushless dc (i.e. 120°e, discontinuous conduction) switching strategy, together with loss predictions for a surface magnet rotor design and operation of the prototype machine, with either rotor topology, via a vector oriented sinusoidal controller.

Original languageEnglish
Title of host publicationEighth International Conference on Electrical Machines and Drives
PublisherInstitution of Engineering and Technology
Pages200-204
Number of pages5
Volume444
ISBN (Print)0852966962
DOIs
Publication statusPublished - 1 Sep 1997
Externally publishedYes
EventProceedings of the 1997 8th International Conference on Electrical Machines and Drives - Cambridge, United Kingdom
Duration: 1 Sep 19973 Sep 1997
Conference number: 8

Publication series

NameIEE Conference Publication
PublisherInstitution of Engineering and Technology
Volume444
ISSN (Print)0537-9989

Conference

ConferenceProceedings of the 1997 8th International Conference on Electrical Machines and Drives
CountryUnited Kingdom
CityCambridge
Period1/09/973/09/97

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