Investigation of Magnetic Isolation in a Double-Side Asynchronous Rotor-AFPM Machine Based on Harmonic Analysis

Rundong Huang; Bowen Zhang; Yuxin Liu; Chunhua Liu

doi:10.1109/TIE.2024.3417985

Investigation of Magnetic Isolation in a Double-Side Asynchronous Rotor-AFPM Machine Based on Harmonic Analysis

Rundong Huang
, Bowen Zhang
, Yuxin Liu
, Chunhua Liu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

13 Citations (Scopus)

Abstract

Electric machines are important components in the actuators of robot dogs, but these actuators usually need several freedoms. To get two free mechanical ports, the double-side asynchronous rotor axial-flux permanent magnet (DSAR-AFPM) machine is proposed. The DSAR-AFPM machine has two different configurations on two sides, which are 20-pole-24-slot (20P24S) and 42-pole-36- slot (42P36S) configurations. The two asynchronous rotors can output torques independently at any speed. This article performs an investigation for the magnetic isolation of the DSAR-AFPM machine. The working harmonics and interference harmonics are all calculated when different pole-slot combinations are applied. It is verified that there is magnetic isolation between the two sides. Then, a 3-D finite element analysis is conducted to verify the effect of harmonics on the performances of the DSAR-AFPM machine. It is compared with the 20P24S and 42P36S single-side AFPM machines. The results are consistent with the investigation of magnetic isolation. The back electromotive forces (EMFs) and torques on two sides are unrelated. Finally, an experiment is conducted to validate the independence of two asynchronous rotors.
© 2024 IEEE.

Original language	English
Pages (from-to)	240-250
Number of pages	11
Journal	IEEE Transactions on Industrial Electronics
Volume	72
Issue number	1
Online published	15 Jul 2024
DOIs	https://doi.org/10.1109/TIE.2024.3417985
Publication status	Published - Jan 2025

Funding

This work was supported in part by the Natural Science Foundation of China (NSFC), China under Grant 52077186 and Grant 52377069, in part by the Science Technology and Innovation Committee of Shenzhen Municipality, Shenzhen, China under Grant JCYJ20210324134005015, and in part by the RGC Research Fellow Scheme, Research Grants Council, Hong Kong SAR under RGC Ref. No. RFS2223-1S05.

Research Keywords

Axial-flux permanent magnet (AFPM) machine
double-side asynchronous rotor (DSAR)
harmonic analysis
magnetic isolation

RGC Funding Information

RGC-funded

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10.1109/TIE.2024.3417985

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@article{09eb9fcba79044d197e9fda0d62febbd,

title = "Investigation of Magnetic Isolation in a Double-Side Asynchronous Rotor-AFPM Machine Based on Harmonic Analysis",

abstract = "Electric machines are important components in the actuators of robot dogs, but these actuators usually need several freedoms. To get two free mechanical ports, the double-side asynchronous rotor axial-flux permanent magnet (DSAR-AFPM) machine is proposed. The DSAR-AFPM machine has two different configurations on two sides, which are 20-pole-24-slot (20P24S) and 42-pole-36- slot (42P36S) configurations. The two asynchronous rotors can output torques independently at any speed. This article performs an investigation for the magnetic isolation of the DSAR-AFPM machine. The working harmonics and interference harmonics are all calculated when different pole-slot combinations are applied. It is verified that there is magnetic isolation between the two sides. Then, a 3-D finite element analysis is conducted to verify the effect of harmonics on the performances of the DSAR-AFPM machine. It is compared with the 20P24S and 42P36S single-side AFPM machines. The results are consistent with the investigation of magnetic isolation. The back electromotive forces (EMFs) and torques on two sides are unrelated. Finally, an experiment is conducted to validate the independence of two asynchronous rotors. {\textcopyright} 2024 IEEE. ",

keywords = "Axial-flux permanent magnet (AFPM) machine, double-side asynchronous rotor (DSAR), harmonic analysis, magnetic isolation",

author = "Rundong Huang and Bowen Zhang and Yuxin Liu and Chunhua Liu",

year = "2025",

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doi = "10.1109/TIE.2024.3417985",

language = "English",

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pages = "240--250",

journal = "IEEE Transactions on Industrial Electronics",

issn = "0278-0046",

publisher = "IEEE Industrial Electronics Society",

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TY - JOUR

T1 - Investigation of Magnetic Isolation in a Double-Side Asynchronous Rotor-AFPM Machine Based on Harmonic Analysis

AU - Huang, Rundong

AU - Zhang, Bowen

AU - Liu, Yuxin

AU - Liu, Chunhua

PY - 2025/1

Y1 - 2025/1

N2 - Electric machines are important components in the actuators of robot dogs, but these actuators usually need several freedoms. To get two free mechanical ports, the double-side asynchronous rotor axial-flux permanent magnet (DSAR-AFPM) machine is proposed. The DSAR-AFPM machine has two different configurations on two sides, which are 20-pole-24-slot (20P24S) and 42-pole-36- slot (42P36S) configurations. The two asynchronous rotors can output torques independently at any speed. This article performs an investigation for the magnetic isolation of the DSAR-AFPM machine. The working harmonics and interference harmonics are all calculated when different pole-slot combinations are applied. It is verified that there is magnetic isolation between the two sides. Then, a 3-D finite element analysis is conducted to verify the effect of harmonics on the performances of the DSAR-AFPM machine. It is compared with the 20P24S and 42P36S single-side AFPM machines. The results are consistent with the investigation of magnetic isolation. The back electromotive forces (EMFs) and torques on two sides are unrelated. Finally, an experiment is conducted to validate the independence of two asynchronous rotors. © 2024 IEEE.

AB - Electric machines are important components in the actuators of robot dogs, but these actuators usually need several freedoms. To get two free mechanical ports, the double-side asynchronous rotor axial-flux permanent magnet (DSAR-AFPM) machine is proposed. The DSAR-AFPM machine has two different configurations on two sides, which are 20-pole-24-slot (20P24S) and 42-pole-36- slot (42P36S) configurations. The two asynchronous rotors can output torques independently at any speed. This article performs an investigation for the magnetic isolation of the DSAR-AFPM machine. The working harmonics and interference harmonics are all calculated when different pole-slot combinations are applied. It is verified that there is magnetic isolation between the two sides. Then, a 3-D finite element analysis is conducted to verify the effect of harmonics on the performances of the DSAR-AFPM machine. It is compared with the 20P24S and 42P36S single-side AFPM machines. The results are consistent with the investigation of magnetic isolation. The back electromotive forces (EMFs) and torques on two sides are unrelated. Finally, an experiment is conducted to validate the independence of two asynchronous rotors. © 2024 IEEE.

KW - Axial-flux permanent magnet (AFPM) machine

KW - double-side asynchronous rotor (DSAR)

KW - harmonic analysis

KW - magnetic isolation

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001273027600001

U2 - 10.1109/TIE.2024.3417985

DO - 10.1109/TIE.2024.3417985

M3 - RGC 21 - Publication in refereed journal

SN - 0278-0046

VL - 72

SP - 240

EP - 250

JO - IEEE Transactions on Industrial Electronics

JF - IEEE Transactions on Industrial Electronics

IS - 1

ER -

Investigation of Magnetic Isolation in a Double-Side Asynchronous Rotor-AFPM Machine Based on Harmonic Analysis

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RFS: Development of Advanced Electric Machines and Smart Power Drives for Electric Propulsion

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Investigation of Magnetic Isolation in a Double-Side Asynchronous Rotor-AFPM Machine Based on Harmonic Analysis

Abstract

Funding

Research Keywords

RGC Funding Information

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RFS: Development of Advanced Electric Machines and Smart Power Drives for Electric Propulsion

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