Modular Spoke-Type Permanent-Magnet Machine for In-Wheel Traction Applications

Hengliang Zhang; Wei Hua; Zhongze Wu

doi:10.1109/TIE.2018.2803724

Modular Spoke-Type Permanent-Magnet Machine for In-Wheel Traction Applications

Hengliang Zhang, Wei Hua, Zhongze Wu

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

49 Citations (SciVal)

Abstract

This paper proposes a novel modular spoke-type permanent-magnet machine for in-wheel traction applications. First, the topology and the operating principle are briefly introduced. Then, an analytical model of the proposed machine is deduced based on conformal mapping. A three-phase 48-slot 52-pole modular spoke-type permanent-magnet (PM) machine is designed based on the deduced mathematical model where the dimensions and power source are constrained the same as those of a commercial three-phase surface PM machine in electric motorcycles. Electromagnetic performance comparisons among the proposed machine, the commercial machine, and a conventional spoke-type PM machine are conducted based on finite-element analysis (FEA) with respect to magnetic field, back electromotive force (EMF), flux-weakening capability, torque capability, machine efficiency, etc. The results indicate that the proposed machine has an improved torque, a higher efficiency, and an extremely better flux-weakening capability than the conventional in-wheel machine. Finally, a prototype machine is manufactured and tested to verify both the analytically and FEA predicted results.

Original language	English
Pages (from-to)	7648-7659
Number of pages	12
Journal	IEEE Transactions on Industrial Electronics
Volume	65
Issue number	10
Early online date	8 Feb 2018
DOIs	https://doi.org/10.1109/TIE.2018.2803724
Publication status	E-pub ahead of print - 8 Feb 2018

Funding

Manuscript received July 10, 2017; revised September 22, 2017, November 14, 2017, December 7, 2017, and January 16, 2018; accepted January 23, 2018. Date of publication February 8, 2018; date of current version June 1, 2018. This work was supported by the National Natural Science Foundation of China under Grant 51777032. (Corresponding author: Wei Hua.) H. Zhang and W. Hua are with the School of Electrical Engineering, Southeast University, Nanjing, Jiangsu 210096, China (e-mail: [email protected]; [email protected]).

Keywords

AC machines
brushless machines
conformal mapping
electric vehicles
finite-element analysis (FEA)
permanent-magnet (PM) machines

ASJC Scopus subject areas

Control and Systems Engineering
Electrical and Electronic Engineering

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10.1109/TIE.2018.2803724

Cite this

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title = "Modular Spoke-Type Permanent-Magnet Machine for In-Wheel Traction Applications",

abstract = "This paper proposes a novel modular spoke-type permanent-magnet machine for in-wheel traction applications. First, the topology and the operating principle are briefly introduced. Then, an analytical model of the proposed machine is deduced based on conformal mapping. A three-phase 48-slot 52-pole modular spoke-type permanent-magnet (PM) machine is designed based on the deduced mathematical model where the dimensions and power source are constrained the same as those of a commercial three-phase surface PM machine in electric motorcycles. Electromagnetic performance comparisons among the proposed machine, the commercial machine, and a conventional spoke-type PM machine are conducted based on finite-element analysis (FEA) with respect to magnetic field, back electromotive force (EMF), flux-weakening capability, torque capability, machine efficiency, etc. The results indicate that the proposed machine has an improved torque, a higher efficiency, and an extremely better flux-weakening capability than the conventional in-wheel machine. Finally, a prototype machine is manufactured and tested to verify both the analytically and FEA predicted results.",

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N2 - This paper proposes a novel modular spoke-type permanent-magnet machine for in-wheel traction applications. First, the topology and the operating principle are briefly introduced. Then, an analytical model of the proposed machine is deduced based on conformal mapping. A three-phase 48-slot 52-pole modular spoke-type permanent-magnet (PM) machine is designed based on the deduced mathematical model where the dimensions and power source are constrained the same as those of a commercial three-phase surface PM machine in electric motorcycles. Electromagnetic performance comparisons among the proposed machine, the commercial machine, and a conventional spoke-type PM machine are conducted based on finite-element analysis (FEA) with respect to magnetic field, back electromotive force (EMF), flux-weakening capability, torque capability, machine efficiency, etc. The results indicate that the proposed machine has an improved torque, a higher efficiency, and an extremely better flux-weakening capability than the conventional in-wheel machine. Finally, a prototype machine is manufactured and tested to verify both the analytically and FEA predicted results.

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KW - AC machines

KW - brushless machines

KW - conformal mapping

KW - electric vehicles

KW - finite-element analysis (FEA)

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Modular Spoke-Type Permanent-Magnet Machine for In-Wheel Traction Applications

Abstract

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Keywords

ASJC Scopus subject areas

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