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

Effect of Power Factor on Rotor Loss in High-Speed PM Alternators
Effect of Power Factor on Rotor Loss in High-Speed PM Alternators
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.
0-85296-720-9
346-50
Sharkh, Suleiman Abu
de2f77fe-1bb9-492f-95e4-502514f20441
Irenji, Neamat Taghizadeh
e553dadd-bd42-44c9-afbc-37a1b003e825
Harris, Martyn
3f289d34-8220-4877-a3c2-22af3e08c5b3
Sharkh, Suleiman Abu
de2f77fe-1bb9-492f-95e4-502514f20441
Irenji, Neamat Taghizadeh
e553dadd-bd42-44c9-afbc-37a1b003e825
Harris, Martyn
3f289d34-8220-4877-a3c2-22af3e08c5b3

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

Record type: Conference or Workshop Item (Other)

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.

Full text not available from this repository.

More information

Published date: September 1999
Additional Information: Address: IEE, London
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 254468
URI: http://eprints.soton.ac.uk/id/eprint/254468
ISBN: 0-85296-720-9
PURE UUID: 5df66fdf-9866-4aca-bb16-c4d7ba68d65d

Catalogue record

Date deposited: 06 Apr 2001
Last modified: 16 Jul 2019 23:01

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