Field Diffusion Equation in High-speed Surface-mounted Permanent Magnet Motors, Parasitic Eddy-current Losses
نویسندگان
چکیده
The authors present a general computation of the time-varying magnetic flux density distribution of high-speed surface mounted permanent magnet (PM) motors (SMPMM). It deals with an analytical model (AM) which is based on a two-dimensional (2-D) analysis in polar co-ordinates and solves the governing Helmholtz/Laplace field equation in the airgap/magnet/rotor yoke regions, with due account of the eddy-current reaction field. It enables the parasitic eddy-current losses in the turning parts (i.e. PM and rotor yoke) to be calculated for SMPMM, having either internal or external rotor topologies and overlapping stator windings. This analysis accounts for both time and space magnetomotive force (MMF) harmonics, but neglects the influence of the stator slotting. The analytical results are compared with the ones obtained by numerical analysis using the finite-element method (FEM) and show a good agreement.
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