Title :
Effect of Number of Phases on Losses in Conducting Sleeves of High Speed Surface PM Machine Rotors
Author :
El-Refaie, Ayman M. ; Shah, Manoj R. ; Qu, Ronghai ; Kern, John M.
Author_Institution :
GE Global Res. Center, Niskayuna
Abstract :
High-speed machines with a solid rotor or a high strength retaining sleeve could offer design and performance advantages. For a specific application, if the use of a high- strength non-magnetic metallic retaining sleeve is more advantageous than a non-metallic (e.g. carbon fiber) one, one needs to evaluate the eddy current losses due to armature reaction space and time harmonics and/or tooth ripple, as they can be significant. This problem is aggravated furthermore in fractional-slot concentrated winding machines due to their inherent sub and super non-synchronous mmf harmonic components. In this paper, the impact of number of phases is quantified to help design a lower eddy loss rotor sleeve for a high speed surface mounted permanent magnet rotor machine with fractional-slot concentrated armature winding, FSPCW-SPM. The goal of this paper is to provide a general method for laying out preferred FSPCW configurations. Also a general method for screening and choosing the optimal slot/pole combinations is presented.
Keywords :
eddy current losses; machine windings; permanent magnet machines; rotors; synchronous machines; armature reaction space; armature winding; concentrated windings; conducting sleeves; eddy current losses; fractional slot windings; retaining sleeves; surface permanent magnet synchronous machines; time harmonics; tooth ripple; Design engineering; Fault tolerance; Machine windings; Performance loss; Permanent magnet machines; Propulsion; Scanning probe microscopy; Solids; Space heating; Teeth;
Conference_Titel :
Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-1259-4
Electronic_ISBN :
0197-2618
DOI :
10.1109/07IAS.2007.236
