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| Comparative Study on the Double Stator Axial Flux Switched Reluctance Motors with Different Winding Structures |
| Yu Fengyuan1,2,3,4, Chen Hao1,2,3,4, Wang Xing2,3,4, Wang Guanjun5 |
1. School of Electrical Engineering China University of Mining and Technology Xuzhou 221116 China;
2. International Joint Research Center of Central and Eastern European Countries on New Energy Electric Vehicle Technology and Equipment Xuzhou 221008 China;
3. International Cooperation Joint Laboratory of New Energy Power Generation and Electric Vehicles of Jiangsu Province Colleges and Universities Xuzhou 221008 China;
4. Xuzhou Key Laboratory of New Energy Electric Vehicle Technology and Equipment Xuzhou 221008 China;
5. Wuxi Inspection and Certification Research Institute Wuxi 214101 China |
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Abstract The axial flux switched reluctance motor (AFSRM) features a flux path aligned parallel to the rotating axis, enabling torque output independent of axial length constraints. It offers advantages such as a short axial length, a substantial air gap area, and high torque density. The double stator AFSRM (DSAFSRM) structure is particularly promising due to its balanced axial magnetic force and extensive winding heat dissipation area. This paper focuses on the performance comparison of three DSAFSRM motors employing concentrated, single-tooth, and full-pitch windings, respectively.
Firstly, the flux paths of the three motors employing different stator winding configurations are analyzed. The general design flow of DSAFSRM is given. Three-dimensional finite element models of the three motors are established in the Altair Flux software. Finite element analysis results show that the average static torque values of C-DSAFSRM, ST-DSAFSRM, and FP-DSAFSRM motors are 10.53 N·m, 16.22 N·m, and 16.92 N·m at 30 A applied current and 28.04 N·m, 41.03 N·m, and 48.82 N·m at 100 A current, respectively. In addition, the static inductance characteristics of the three motors are also compared. At 10 A current, the maximum-to-minimum inductance difference values of C-DSAFSRM, ST-DSAFSRM, and FP-DSAFSRM are 11.87 mH, 19.70 mH, and 24.77 mH, respectively, and the maximum-to-minimum inductance ratios of the three motors are 6.30, 6.16 and 8.94, respectively. In addition, the static torque and flux linkage data are imported into the Matlab/Simulink environment, and the dynamic performance is analyzed. The average output torque values of the three motors at rated speeds are 16.7 N·m, 21.5 N·m, and 24.1 N·m for the same voltage and conduction width. The average torque per unit mass of the three motors at rated state is 1.53 N·m/kg, 1.80 N·m/kg, and 1.62 N·m/kg, respectively. However, the average torque per unit volume of the three motors are 22.6 N·m/L, 29.5 N·m/L, and 32.6 N·m/L, respectively. In addition, the efficiency MAP distributions of the three motors are analyzed. Among the three motors, the maximum efficiency value of C-DSAFSRM is more than 94%, the highest efficiency value of ST-DSAFSRM is the next highest (around 92%), while the maximum efficiency value of FP-DSAFSRM is the lowest (around 91%). Finally, the accuracy of the analysis of the static and dynamic performance results is verified by fabricating two prototypes.
The following conclusions can be drawn. (1) FP-DSAFSRM and ST-DSAFSRM exhibit shorter flux paths than C-DSAFSRM. (2) FP-DSAFSRM demonstrates larger maximum-to-minimum inductance ratios than ST-DSAFSRM and C-DSAFSRM. (3) FP-DSAFSRM boasts the highest torque density per unit volume, while ST-DSAFSRM has the greatest torque density per unit mass. (4) C-DSAFSRM achieves a higher maximum operating efficiency. (5) FP-DSAFSRM attains a higher open-loop steady-state speed.
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Received: 17 November 2023
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2024, Vol. 39 
