Effect of Power Factor on Rotor Loss in High-Speed PM Alternators

Sharkh, Suleiman Abu, Irenji, Neamat Taghizadeh and Harris, Martyn (1999) Effect of Power Factor on Rotor Loss in High-Speed PM Alternators. UNSPECIFIED IEE, 346-50.

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Description/Abstract

Rotor electromagnetic loss in high-speed PM machines can be significant, causing overheating leading to failure. The paper calculates rotor loss in a 50 kW high-speed alternator for different load power factors. A multi-layer current sheet model that was published previously by the authors [1, 2] is used to calculate the loss for each airgap flux harmonic travelling wave. The harmonics are evaluated from a number of magnetostatic FE solutions of the machine at different rotor positions. A close examination of the loss caused by each harmonic shows that mmf slot harmonics combine with no-load harmonics so as to increase rotor loss as the power factor changes from inductive to capacitive. The paper also discusses the accuracy of the current sheet model and presents results on the interaction between rotor eddy current flux and stator teeth, which is not accounted for in the current sheet model. The results show that for the alternator under study this effect introduces less than 6% error in the calculation of rotor loss.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Additional Information:	Address: IEE, London
ISBNs:	0852967209
ISSNs:	0537-9989
Divisions:	Faculty of Physical and Applied Science > Electronics and Computer Science
Item ID:	254468
Date Deposited:	06 Apr 2001
Last Modified:	01 Mar 2012 10:42
Contributors:	Sharkh, Suleiman Abu (Author) Irenji, Neamat Taghizadeh (Author) Harris, Martyn (Author)
Date:	September 1999
Additional Information:	Address: IEE, London
Status:	Published
Publisher:	IEE
Further Information:	Google Scholar
URI:	http://eprints.soton.ac.uk/id/eprint/254468

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