Experimental verification of optimal flux weakening in surface PM machines using concentrated windings

Author

El-Refaie, Ayman M. ; Jahns, Thomas M. ; McCleer, Patrick J. ; McKeever, John W.

Author_Institution

Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA

Volume

2

fYear

2005

fDate

2-6 Oct. 2005

Firstpage

1050

Abstract

Previous analytical work has shown that it is possible to design surface PM (SPM) machines using fractional-slot concentrated windings to achieve wide speed ranges of constant power operation by satisfying the optimal flux-weakening condition. This paper presents a 6 kW 36-slot/30-pole concentrated winding prototype SPM machine that has been designed using a closed-form analytical technique developed specifically for this class of machines. Experimental testing of this machine has been carried out to determine its performance capabilities, including flux-weakening operation. Detailed comparisons between analytical, finite element analysis (FEA), and experimental results are presented that confirm the ability of fractional-slot concentrated winding SPM machines to achieve their high-speed operating objectives. Important issues including the machine´s back-emf voltage at top speed, eddy current losses in the magnets, and inverter performance are analyzed and discussed in detail.

Keywords

eddy current losses; finite element analysis; invertors; machine testing; machine windings; permanent magnet machines; FEA; closed-form analytical technique; eddy current losses; finite element analysis; fractional-slot concentrated windings; inverter performance; machine back-emf voltage; machine testing; optimal flux weakening; surface permanent magnet machines; Eddy currents; Finite element methods; Machine windings; Magnetic analysis; Magnetic losses; Magnets; Prototypes; Scanning probe microscopy; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005

ISSN

0197-2618

Print_ISBN

0-7803-9208-6

Type

conf

DOI

10.1109/IAS.2005.1518487

Filename

1518487