Design and analysis of axial flux shaftless rim permanent magnet motor

Jin Gao; Qianxiang Liu; Siqi Yang

Design and analysis of axial flux shaftless rim permanent magnet motor

Jin Gao

Qianxiang Liu

Siqi Yang

Vol. 25, No. 10, pp. 1908-1917, Oct. 2025

10.1007/s43236-025-01021-5

Axial flux

Rim thruster

Shaftless

Three-dimensional magnetic field

Cogging torque

Abstract

This paper proposes a novel axial flux shaftless rim permanent magnet motor (ASPM) for new energy marine electric propulsion systems. The structure employs a 20-pole, 24-slot configuration, with the main magnetic flux path comprising a mixed magnetic circuit that includes axial, radial, and tangential directions. Helical windings are wrapped around the middle horizontal section of a U-shaped stator core. After power is supplied, the three-phase winding creates a stator magnetic field that rotates continuously in the tangential direction, rather than in a jump-type manner, to reduce torque ripple. The motor features a shaftless structure and is characterized by a high torque at low speeds. This paper describes the structure and operation principles of the motor, performs a three-dimensional finite element analysis of the magnetic field, and compares it with a radially magnetized permanent magnet synchronous motor of the same size. A prototype model was fabricated and its performance was tested.

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Cite this article

[IEEE Style]

J. Gao, Q. Liu, S. Yang, "Design and analysis of axial flux shaftless rim permanent magnet motor," Journal of Power Electronics, vol. 25, no. 10, pp. 1908-1917, 2025. DOI: 10.1007/s43236-025-01021-5.

[ACM Style]

Jin Gao, Qianxiang Liu, and Siqi Yang. 2025. Design and analysis of axial flux shaftless rim permanent magnet motor. Journal of Power Electronics, 25, 10, (2025), 1908-1917. DOI: 10.1007/s43236-025-01021-5.