Hybrid Approach for Determining Eddy-Current Losses in High-Speed PM Rotors

Author

Saban, Daniel M. ; Lipo, Thomas A.

Author_Institution

Direct Drive Syst., Cerritos

Volume

1

fYear

2007

fDate

3-5 May 2007

Firstpage

658

Lastpage

661

Abstract

This paper presents a novel method for calculating rotor eddy-current losses of PM machines using an analytically derived current sheet (2D) in combination with commercially available FE software (3D). First, an equation-based approach is used to determine the total magnetic field at the stator inner diameter. A 2D current sheet is formulated from the total field in the rotor reference frame. Next, the 2D current sheet is extended axially and used in a 3D FE analysis of the machines un-magnetized rotor. Using this procedure, rotor loss caused by armature current time harmonics, slot permeance variation and winding MMF harmonics has been calculated that properly considers axial variation with limited computing resources.

Keywords

eddy current losses; finite element analysis; harmonics; permanent magnet machines; 2D current sheet; 3D FE analysis; FE software; armature current time harmonics; eddy-current losses; equation-based approach; high-speed PM rotors; machines un-magnetized rotor; permanent magnet machines; rotor reference frame; slot permeance variation; stator inner diameter; total magnetic field; winding MMF harmonics; Drives; Equations; Iron; Magnetic analysis; Magnetic fields; Permanent magnets; Solids; Stator windings; Time domain analysis; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Machines & Drives Conference, 2007. IEMDC '07. IEEE International

Conference_Location

Antalya

Print_ISBN

1-4244-0742-7

Electronic_ISBN

1-4244-0743-5

Type

conf

DOI

10.1109/IEMDC.2007.382745

Filename

4270718