Eddy Current Braking Force Analysis of a Water-Cooled Ironless Linear Permanent Magnet Synchronous Motor

Mengyao Wang, Lu Zhang (), Kai Yang, Junjie Xu and Chunyu Du
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Mengyao Wang: Department of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
Lu Zhang: Department of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
Kai Yang: Department of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
Junjie Xu: Department of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China
Chunyu Du: Department of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, China

Energies, 2023, vol. 16, issue 15, 1-16

Abstract: The ironless linear permanent magnet synchronous motor (ILPMSM) is highly compact, easy to control, and exhibits minimal thrust fluctuations, making it an ideal choice for direct loading applications requiring precise positioning accuracy in linear motor test rigs. To address the issue of temperature rise resulting from increased primary winding current and to simultaneously enhance thrust density while minimizing thrust fluctuations, this paper introduces a bilateral-type ILPMSM with a cooling water jacket integrated between the dual-layer windings of the primary movers. The primary winding of the motor adopts a dual-layer coreless structure where the upper and lower windings are closely spaced and cooled by a non-conductive metal cooling water jacket, while the dual-sided secondary employs a Halbach permanent magnet array. The motor’s overall braking force is a combination of the electromagnetic braking force generated by the energized windings and the eddy current braking force induced on the cooling water jacket. This paper specifically focuses on the analysis of the eddy current braking force. Initially, the motor’s geometry and working principle are presented. Subsequently, the equivalent magnetization intensity method is employed to determine the no-load air gap magnetic density resulting from the Halbach array. An analytical model is then developed to derive expressions for the eddy current density and braking force induced in the water-cooling jacket. The accuracy of the analytical method is validated through finite element analysis. Then, a comparative analysis of the braking forces in two primary cooling structures, namely the inter-cooled type and the two-side cooled type ILPMSM, is conducted. Moreover, the characteristics of the eddy current braking force are thoroughly examined concerning motor size parameters and operating conditions. This paper provides a solid theoretical foundation for the subsequent optimization design of the proposed motor.

Keywords: eddy current braking force; ironless linear permanent magnet motor; cooling water jacket; parameter effect analyze (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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