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access icon free Analytical design of the integrated motor used in a hubless rim-driven propulsor

  • Author(s): Bo Cheng 1, 2 ; Guang Pan 1, 2 ; Yali Cao 1
    • View affiliations
  • Source: Volume 13, Issue 9, September 2019, p. 1255 – 1262
    DOI:  10.1049/iet-epa.2018.5303 , Print ISSN 1751-8660, Online ISSN 1751-8679
© The Institution of Engineering and Technology
Received 27/10/2017, Accepted 14/09/2018, Revised 05/06/2018, Published 20/11/2018

The rim-driven integrated motor propulsor (IMP) has received much attention in recent years, owing to its superiority in flexibility, reliability, and space occupation. For this propulsion system, radially thin motors with high torque and large air gaps are essential. Two-segment Halbach array permanent magnets with unequal segment-arc are adopted to enable a thin rotor and a large air gap. The general analytical solution of the magnetic field is presented. Based on the analytical calculation of the Halbach motor performance, the necessity of the rotor core was discussed, and the Halbach array was optimised with an analytical method to maximise the electromagnetic torque. This study also tried and compared three designs of the integrated motor stator to further reduce the radial thickness, and the slotted stator proved more reasonable. The fabrication of an IMP prototype was completed, and the experimental data of the integrated motor are presented and compared with the calculated results. This study also conducted the water tunnel experiment of the IMP prototype to test the integrated motor performance in the overall IMP system. The measured rotational speed and output thrust are less than expected, so the friction loss in the IMP gap flow field is calculated and analysed.

Inspec keywords: magnetic fields; torque; permanent magnet motors; permanent magnets; air gaps; rotors; design engineering; stators; mechanical strength

Other keywords: IMP gap flow field; output thrust; space occupation; high torque; magnetic field; propulsion system; thin motors; two-segment Halbach array permanent magnets; rotor core; analytical method; integrated motor performance; analytical design; IMP system; integrated motor stator; hubless rim-driven propulsor; rotational speed; unequal segment-arc; friction loss; IMP prototype; thin rotor; electromagnetic torque maximisation; air gap; rim-driven integrated motor propulsor; Halbach motor performance; slotted stator; radial thickness

Subjects: Permanent magnets; Protection apparatus; a.c. machines

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