DV-08 A Method of Deriving Electromagnetic Characteristics of a SPMSM Based on Two-Stage Magnetostatic FEA
Creators: Joo-Chang Lee
Dong-Kuk Lim
Publisher: name: IEEE
Year: 2025

This paper proposes a new strategy to quickly review the output and vibration characteristics of a surface mounted permanent magnet synchronous motor (SPMSM) by the two-stage magneto-static finite element analysis (TSS-FEA). In general, methods of evaluating motor performance are divided into finite element analysis (FEA) and analytical method (AM). The FEA has high accuracy, but it takes a lot of time. On the other hand, the AM is less accurate than the FEA, but motor performance can be quickly derived [1]. Meanwhile, electric motors have recently been used in various fields. Some applications, require high output density and low vibration at the same time [2]. The TSS-FEA aims to identify the time-varying electromagnetic force with magneto static FEA (MS-FEA) and derive torque and voltage. The flowchart of TSS-FEA is shown in Fig. 1. First, MS-FEA is performed under no-load conditions to derive air-gap permeance, and the air-gap magnetic flux density is calculated through the derived permeance and the magnetomotive force (MMF) calculated by the equation, and the electromagnetic forces are calculated as the magnetic flux density using the maxwell stress tensor [3]. Next, MS-FEA is performed under load conditions to derive voltage and torque. To derive the torque and voltage with reliable accuracy, the flux-linkage is obtained MS-FEA at the initial rotor position, and calculated with the torque and voltage equations using flux-linkage [4]. The results and analysis time obtained through this were compared with time-varying FEA (T-FEA) and summarized in Fig. 2, and it was confirmed that results with reliable accuracy were derived at the reduced calculation time. Since the technique proposed in this paper has reliable accuracy based on MS-FEA and can quickly derive output and electromagnetic forces, it can be used when examining the performance of many design variables in the initial design stage of SPMSM that requires both high output performance and low vibration characteristics. In addition, if the air gap MMF is calculated by an analytical method, it can be applied to any shape, so it can be extended to various shapes of SPMSM.References: [1] Z. Pan and S. Fang, IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 10, no. 2, pp. 1800-1812 (2022) [2] Y. -H. Jung, M. -R. Park and M. -S. Lim, IEEE Transactions on Energy Conversion, vol. 35, no. 2, pp. 928-937 (2020) [3] Z. Xing, X. Wang and W. Zhao, IEEE Transactions on Transportation Electrification, vol. 8, no. 4, pp. 4337-4347 (2022) [4] J. -C. Son and D. -K. Lim, IEEE Transactions on Magnetics, vol. 58, no. 8, pp. 1-6 (2022)
This paper proposes a new strategy to quickly review the output and vibration characteristics of a surface mounted permanent magnet synchronous motor (SPMSM) by the two-stage magneto-static finite element analysis (TSS-FEA). In general, methods of evaluating motor performance are divided into finite element analysis (FEA) and analytical method (AM). The FEA has high accuracy, but it takes a lot of time. On the other hand, the AM is less accurate than the FEA, but motor performance can be quickly derived [1]. Meanwhile, electric motors have recently been used in various fields. Some applications, require high output density and low vibration at the same time [2]. The TSS-FEA aims to identify the time-varying electromagnetic force with magneto static FEA (MS-FEA) and derive torque and voltage. The flowchart of TSS-FEA is shown in Fig. 1. First, MS-FEA is performed under no-load conditions to derive air-gap permeance, and the air-gap magnetic flux density is calculated through the derived permeance and the magnetomotive force (MMF) calculated by the equation, and the electromagnetic forces are calculated as the magnetic flux density using the maxwell stress tensor [3]. Next, MS-FEA is performed under load conditions to derive voltage and torque. To derive the torque and voltage with reliable accuracy, the flux-linkage is obtained MS-FEA at the initial rotor position, and calculated with the torque and voltage equations using flux-linkage [4]. The results and analysis time obtained through this were compared with time-varying FEA (T-FEA) and summarized in Fig. 2, and it was confirmed that results with reliable accuracy were derived at the reduced calculation time. Since the technique proposed in this paper has reliable accuracy based on MS-FEA and can quickly derive output and electromagnetic forces, it can be used when examining the performance of many design variables in the initial design stage of SPMSM that requires both high output performance and low vibration characteristics. In addition, if the air gap MMF is calculated by an analytical method, it can be applied to any shape, so it can be extended to various shapes of SPMSM.References: [1] Z. Pan and S. Fang, IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 10, no. 2, pp. 1800-1812 (2022) [2] Y. -H. Jung, M. -R. Park and M. -S. Lim, IEEE Transactions on Energy Conversion, vol. 35, no. 2, pp. 928-937 (2020) [3] Z. Xing, X. Wang and W. Zhao, IEEE Transactions on Transportation Electrification, vol. 8, no. 4, pp. 4337-4347 (2022) [4] J. -C. Son and D. -K. Lim, IEEE Transactions on Magnetics, vol. 58, no. 8, pp. 1-6 (2022)