Research on 3D Air-gap Magnetic Field of Field Modulated Asynchronous Magnetic Couplings

doi:10.3901/JME.2016.08.008

Abstract

Abstract: A field modulated asynchronous magnetic coupling with 14 pole pairs and 21 ferromagnetic pole-pieces is researched to obtain the spatial distributions of the permanent magnetic field and the modulated magnetic field in the air-gap. The distributions and periods of three-dimensional air-gap magnetic fields are obtained by finite element simulation under the static and transient conditions. Based on equivalent surface current method, the three-dimensional spatial distributions and periods of the permanent field including radial, circumferential and axial components in the outer air-gap are obtained by using the discrete programming of Matlab software. The three-dimensional air-gap fields including the permanent magnetic field and the modulated magnetic field are measured through two different schemes by high precision 3D magnetic field measuring devices. The results show that the distributions of the permanent magnetic field and the modulated magnetic field are periodic, and the number of periods are 14 and 7 respectively. The magnitude of the air-gap magnetic flux density under transient condition is larger than that under static condition. Air-gap magnetic fields’ end effect exist, so that the end region magnetic fields of radial and circumferential components are less than the middle region magnetic fields, but the axial component is the opposite. All of the measurement results, the simulation results and the analytical results are in good agreement.

Key words: 3D air-gap magnetic field, analytical calculation, field modulated asynchronous magnetic couplings, finite element analysis

CLC Number:

TH113

YANG Chaojun, KONG Lingying, ZHANG Tao, LÜ Lei, LUO Yongxin, CHEN Zhipeng. Research on 3D Air-gap Magnetic Field of Field Modulated Asynchronous Magnetic Couplings[J]. Journal of Mechanical Engineering, 2016, 52(8): 8-15.

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