Effect of Pole Shoe Design on Inclination Angle of Different Magnetic Fields in Permanent Magnet Machines

Jonathan Sjölund and Sandra Eriksson
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Jonathan Sjölund: Department of Electrical Engineering, Division of Electricity, Uppsala University, 752 37 Uppsala, Sweden
Sandra Eriksson: Department of Electrical Engineering, Division of Electricity, Uppsala University, 752 37 Uppsala, Sweden

Energies, 2021, vol. 14, issue 9, 1-15

Abstract: Electromagnetic modelling of electrical machines through finite element analysis is an important design tool for detailed studies of high resolution. Through the usage of finite element analysis, one can study the electromagnetic fields for information that is often difficult to acquire in an experimental test bench. The requirement for accurate result is that the magnetic circuit is modelled in a correct way, which may be more difficult to maintain for rare earth free permanent magnets with an operating range that is more likely to be close to non-linear regions for the relation between magnetic flux density and magnetic field strength. In this paper, the inclination angles of the magnetic flux density, magnetic field strength and magnetization are studied and means to reduce the inclination angles are investigated. Both rotating and linear machines are investigated in this paper, with different current densities induced in the stator windings. By proper design of the pole shoes, one can reduce the inclination angles of the fields in the permanent magnet. By controlling the inclination angles, one can both enhance the performance of the magnetic circuit and increase the accuracy of simpler models for permanent magnet modelling.

Keywords: finite element analysis; linear machines; rotating machines; buried topology; inclined fields; permanent magnets; ferrites; pole shoe design (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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