Title :
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
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;
Conference_Titel :
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005
Print_ISBN :
0-7803-9208-6
DOI :
10.1109/IAS.2005.1518487
