| Abstract |
Surface-mounted permanent magnet synchronous machine (SPMSM) is widely used in various fieldsdue to its high power density and reliability (compressors, turbine generators …), in our case it isused in aeronautics. However, in high-speed operations eddy-current losses can be important and leadto a damage because of an overheating (PM detachment, demagnetization …). Therefore, it isimportant to estimate these losses during the design phase. This paper describes a technique toestimate rotor eddy-current losses (magnets and sleeve) for the design of 25 kW, 10.5 krpm 3-phasemotor by means of both analytical and finite-element approach. Firstly, we study the spatial variationof the magnetic flux density in the magnets and the sleeve. Consequently, it results a segmentation ofmagnet and sleeve according to the half of slot pitch. Secondly, we estimate the maximum variation ofmagnetic flux density (36 mT in the summit of magnets, 125 mT in the sleeve) by finite-elementanalysis (COMSOL Multiphysics). Finally, this paper presents the result of computation of rotor eddycurrent losses (97 Watt). |
