Influence of PWM on the Proximity Loss in Permanent-Magnet Brushless AC Machines

A winding copper loss can be significantly increased due to skin and proximity eddy-current effects. The skin and proximity losses due to fundamental frequency current have been investigated in literature, but the influence of pulsewidth modulation (PWM) on the skin and proximity losses has not been...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2009-07, Vol.45 (4), p.1359-1367
Main Authors: Iwasaki, S., Deodhar, R.P., Yong Liu, Pride, A., Zhu, Z.Q., Bremner, J.J.
Format: Article
Language:English
Subjects:
AC machines
Brushless ac machine
Conductors
Copper
Copper loss
eddy-current loss
Finite element methods
Frequency
High frequencies
Magnetic analysis
Mathematical analysis
Modulation
Permanent magnets
permanent-magnetmachine
Proximity
proximity loss
Pulse duration modulation
Pulse width modulation
pulsewidth modulation
Ripples
Skin
skin effect
Space vector pulse width modulation
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Summary:A winding copper loss can be significantly increased due to skin and proximity eddy-current effects. The skin and proximity losses due to fundamental frequency current have been investigated in literature, but the influence of pulsewidth modulation (PWM) on the skin and proximity losses has not been reported. In this paper, a 2-D finite element method is employed to analyze the skin and proximity losses in a permanent magnet brushless ac machine, in which significant proximity loss exists due to high frequency current ripples induced by the PWM, as confirmed by both theoretical calculation and experiment. The analyses should be generally applicable to other machines.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2009.2023488