New elements within finite element modeling of magnetostriction phenomenon in BLDC motor

Podhajecki Jerzy,Rawicki Stanislaw

doi:10.1515/phys-2020-0173

Podhajecki Jerzy, Rawicki Stanislaw

Open Access

https://doi.org/10.1515/phys-2020-0173

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Journal: Open Physics	Publication Date: Aug 17, 2020
Citations: 1	License type: CC BY 4.0

Affiliation: The Jacob of Paradies University

Abstract

AbstractReluctance forces are the main cause of vibration in electrical machines. The influence of magnetostriction is still the matter of controversy. In the article, program Ansys (typical for finite element method) was used to analyze stator deformation due to magnetic forces (Maxwell and magnetostriction) for the different boundaries and different methods by taking into account the windings in the mechanical model. Different parameters of numerical model are important factors affecting the level of magnetostriction deformation.

Highlights

The reluctance forces are known to be a major cause of vibrations for rotating electric machines
Maximum value of displacement due to magnetostriction is about 10–15% of the maximum value of displacement due to Maxwell forces (Figures 7 and 10)
If windings in models are treated as the composite material, the differences within the stator deformation, computed initially with the first kind of boundary conditions and calculated with the second boundary conditions, are presented in Figures 16 and 17 compared with Figures 12 and 14

Summary

Introduction

The reluctance forces are known to be a major cause of vibrations for rotating electric machines. The reluctance forces act in the air gap on the stator teeth, while magnetostriction acts inside the material of stator and rotor core. Both Maxwell and magnetostriction forces are a quadratic function of the flux density, and the forces operate at the same frequency. Belahcen used finite element method to calculate stator vibrations due to Maxwell forces and the magnetostriction for synchronous and induction machines. Mechanical boundary conditions are applied in for nodes of the outer edge of the stator core, which are prohibited from moving in the tangential direction [1]. Windings are taken into account using the composite material structure made of wire and insulated copper [4]

Modeling magnetostriction

Magnetic calculations

Mechanical calculations

Stator deformation for different boundary conditions in mechanical model

Stator deformation for different modeling windings in mechanical model

Conclusions