Structural Analysis of a High Speed Double-Sided Axial Flux Permanent Magnet Motor Vertically Suspended by Magnetic Bearings

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Güney Ö. F. , Çelik A. , Bozkurt A. F. , Erkan K.

19th edition of International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, Nancy, France, 29 - 31 August 2019, vol.2019, no.1, pp.1-4

  • Publication Type: Conference Paper / Full Text
  • Volume: 2019
  • City: Nancy
  • Country: France
  • Page Numbers: pp.1-4
  • Yıldız Technical University Affiliated: Yes


This paper presents the mechanical vibration and stress analysis of an axial flux permanent magnet (AFPM) motor for a high speed (30000 rev/min) rotor which is vertically suspended by active and hybrid magnetic bearings. In the analysis, a prototype AFPM motor with a double-sided rotor and a coreless stator between the rotors are considered. Rotor disks of the motor are constructed of two 10 mm-thick steel disks with 6.35 mm-thick permanent magnets which represent around 60% of the total weight of the machine. Firstly, an analytical solution is carried out to determine the natural frequencies of the rotor-shaft system. Then rotor disk thickness is determined based on a rotor axial displacement due to the attractive force between the permanent magnets placed on opposite rotor disks. Finally, 3D finite element analysis (FEA) are carried out to verify the analytical results.