The paper deals with a new analytical approach for calculating eddy current losses in permanent magnet synchronous machines with tooth windings. The analytical method presented here differs from known approaches in two points: The field is calculated using an all-in-one method, so the simultaneous calculation of stator and no-load field is possible. To take finite magnet dimensions into account, the calculation of an easy-to-use correction factor for endless dimensions is introduced. Losses caused by stator slotting as well as losses caused by stator harmonics are included. To allow for several load cases the stator current phase angle and the eddy current reaction field is considered. Index Terms-eddycurrents, permanent magnet, loss l l l l J x t J t a x J t ax
This paper deals with the investigation of a linear generator used in an internal combustion engine. The introduction reviews the state of the art of free-piston linear generators. Then, the mechanical structure of this generator is presented. The main part treats a finite-element-analysis (FEA) of the generator comparing different armature magnetizations with the numeric simulation program FLUX.A cylindrical design with radial, axial and a quasi-Halbach magnetization in Vernier topology is examined. The number of pole-pairs in a Vernier machine differs by one from stator teeth in principle. This paper is focusing on a Vernier machine with five armature pole-pairs coinciding within six stator teeth (Vernier 5/6). Several geometric parameters, like height of the magnets, slot pitch ratio or length of the magnets are varied in order to find the optimal design with regard to a high thrust force and low force ripple. The paper concludes with the determination of losses and electrical efficiency.
Purpose – The purpose of this paper is to calculate slotting-based eddy currents in permanent magnet excited synchronous machine (PMSM) taking into account axial and circumferential segmentation of magnets. Design/methodology/approach – An analytical approach to calculate eddy current losses in PM caused by slotting harmonics of PMSM is presented. The eddy current reaction field is taken into account as well as axial and circumferential segmentation of the magnets. Findings – The analytical model provides results comparable to 3D-FEM calculations even at high frequencies at reduced computation costs. To generalize the results the magnetic Reynold’s number is introduced. Originality/value – Taking into account the axial and circumferential segmentation in the PDE; the approach is much more accurate compared to known approaches; accuracy is comparable to 3D-FEA.
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