Determination of rotor eddy current losses in permanent magnet machines

Author

Mecrow, B.C. ; Jack, A.G. ; Masterman, J.M.

Author_Institution

Newcastle upon Tyne Univ., UK

fYear

1993

fDate

8-10 Sep 1993

Firstpage

299

Lastpage

304

Abstract

A method has been presented for the calculation of losses in the sleeves of permanent magnet machines, and validated against a set of measurements. Subsequent simulation work has revealed the following conclusions regarding losses in non nonmagnetic and magnetic sleeves. At high speeds the eddy currents in a nonmagnetic sleeve are resistance limited. The eddy currents in a magnetic sleeve are skin limited. Losses in magnetic sleeves are considerably greater than in nonmagnetic sleeves. The loss in the sleeve of either material rises with the sleeve thickness. Buried magnet designs with nonmagnetic sleeves have significantly greater loss than their surface mounted design counterparts. Sleeve loss can be dramatically reduced if the slot opening is reduced

Keywords

eddy current losses; machine theory; permanent magnet machines; rotors; buried magnet designs; eddy currents; magnetic sleeves; nonmagnetic sleeves; permanent magnet machines; rotor eddy current losses; simulation; sleeve losses; slot opening; surface mounted design counterparts;

fLanguage

English

Publisher

iet

Conference_Titel

Electrical Machines and Drives, 1993. Sixth International Conference on (Conf. Publ. No. 376)

Conference_Location

Oxford

Print_ISBN

0-85296-596-6

Type

conf

Filename

253522