Estimation of Eddy Current Loss in Semi-Closed Slot Vertical Conductor Permanent Magnet Synchronous Machines Considering Eddy Current Reaction Effect

Author

Arumugam, Puvan ; Hamiti, T. ; Gerada, C.

Author_Institution

Power Electron., Machines & Control (PEMC) Group, Univ. of Nottingham, Nottingham, UK

Volume

49

Issue

10

fYear

2013

fDate

Oct. 2013

Firstpage

5326

Lastpage

5335

Abstract

This paper presents an analytical methodology based on subdomain field model to calculate eddy current loss in vertical conductor windings (VCWs) of surface mounted, radial flux, permanent magnet (PM) machines considering the current penetration effect. The proposed model can be used with any slot-pole combination including fractional slot machines having VCW. Initially, the model solves the two-dimensional problem based on the Laplace´s and Poisson´s equations using the separation of variables technique for each of the subdomains: PM, airgap, slot opening, and slot. Then, based on that obtained solution, the eddy current reaction field in the slot is calculated by solving complex Helmholtz´s equation. The validity and accuracy of the model is verified using finite-element (FE) analysis. The limitations of analytical method are discussed.

Keywords

Helmholtz equations; Laplace equations; Poisson equation; eddy current losses; finite element analysis; machine windings; permanent magnet machines; synchronous machines; Laplace equation; Poisson equation; airgap; analytical methodology; complex Helmholtz equation; current penetration effect; eddy current loss estimation; eddy current reaction effect; eddy current reaction field; finite-element analysis; fractional slot machines; radial flux machines; semiclosed slot vertical conductor permanent magnet synchronous machines; separation of variables technique; slot opening; slot-pole combination; subdomain field model; surface mounted machines; two-dimensional problem; vertical conductor windings; Ac losses; analytical method; concentrated winding; eddy currents; exact solution; permanent magnet; skin effect;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2260828

Filename

6510516