VP21-04 A New Double-Sided Flux Modulated Permanent Magnet Arc Motor Having Parallel Complementary Effect
Creators: Jinhao Cai
Zhenbao Pan
Jiwen Zhao
Kaiwei Wei
and Zixiang Yu
Publisher: name: IEEE
Year: 2025

I. INTRODUCTION Permanent magnet (PM) arc motor(PMAM) has the merits of simple structure and high torque. It is widely used in the some low-speed high-torque direct drive applications [1]. The traditional single-sided flux modulated PMAM (SS-FMPMAM) has the limited average torque and high torque ripple. Hence, a double sided FMPMAM (DS-FMPMAM) is studied to improve the output torque and PM utilization rate [2]. In order to further reduce the torque ripple, this paper proposes a new parallel complementary DS-FMPMAM (PCDS-FMPMAM) based on the parallel complementation and bidirectional flux modulation effect. II. MOTOR TOPOLOGY AND WORKING PRINCIPLE Figs. 1 (a) and (b) show the topologies of the SS-FMPMAM and DS-FMPMAM, respectively. Figs. 1 (c) and (d) show the 2D and 3D view of the PCDS-FMPMAM, respectively. They are composed of three stator modules and one rotor. Each stator module and the rotor forms a unit motor. Three PMAMs adopt the consequent-pole PM (CPM) design. Besides, the PM arrangement of stator is the N-Iron-N. As shown in Fig. 1, both the SS-FMPMAM and DS-FMPMAM have the same PM magnetized direction. However, the PCDS-FMPMAM is formed by the front DS-FMPMAM and the rear DS-FMPMAM in parallel. The PMs of front motor and the rear motor in PCDS-FMPMAM are radially outward and inward magnetized, respectively. The rotor difference between the front motor and rear motor is 180° electrical angle. The stator has no mechanical displacement, and the front motor and rear motor share the common armature winding. III. ELECTROMAGNETIC PERFORMANCE ANALYSIS Figs. 2 (a) and (b) show the flux linkage and back-EMF of the three PMAMs, respectively. Compared with SS-FMPMAM, both DS-FMPMAM and PCDS-FMPMAM can provide twice the flux linkage and back-EMF. Figs. 2 (c) and (d) compare the torque characteristics of the three motors. The results show that the DS-FMPMAM and PCDS-FMPMAM has 50% higher torque than the SS-FMPMAM. Compared with DS-FMPMAM, the torque ripple of PCDS-FMPMAM has also been reduced by about 50%. Therefore, the PCDS-FMPMAM has the best motor performances in the three PMAMs. More design considerations and results analysis will be given in the full paper.References: [1] C. J. Jian, M. W. Li, and H. J. Long, “Design and optimization of arc permanent magnet synchronous motor used on large telescope,” IEEE Trans. Magn., vol. 48, no. 5, pp. 1943-1947, May 2012. [2] Y. Meng, S. Fang, Y. Zhu, Y. Yu, L. Qin, “Investigation of new dual-stator consequent-pole flux reversal permanent magnet arc machines,” IEEE Trans. Appl. Supercon., vol. 34, no. 8, Nov. 2024, Art. no. 5204105.
I. INTRODUCTION Permanent magnet (PM) arc motor(PMAM) has the merits of simple structure and high torque. It is widely used in the some low-speed high-torque direct drive applications [1]. The traditional single-sided flux modulated PMAM (SS-FMPMAM) has the limited average torque and high torque ripple. Hence, a double sided FMPMAM (DS-FMPMAM) is studied to improve the output torque and PM utilization rate [2]. In order to further reduce the torque ripple, this paper proposes a new parallel complementary DS-FMPMAM (PCDS-FMPMAM) based on the parallel complementation and bidirectional flux modulation effect. II. MOTOR TOPOLOGY AND WORKING PRINCIPLE Figs. 1 (a) and (b) show the topologies of the SS-FMPMAM and DS-FMPMAM, respectively. Figs. 1 (c) and (d) show the 2D and 3D view of the PCDS-FMPMAM, respectively. They are composed of three stator modules and one rotor. Each stator module and the rotor forms a unit motor. Three PMAMs adopt the consequent-pole PM (CPM) design. Besides, the PM arrangement of stator is the N-Iron-N. As shown in Fig. 1, both the SS-FMPMAM and DS-FMPMAM have the same PM magnetized direction. However, the PCDS-FMPMAM is formed by the front DS-FMPMAM and the rear DS-FMPMAM in parallel. The PMs of front motor and the rear motor in PCDS-FMPMAM are radially outward and inward magnetized, respectively. The rotor difference between the front motor and rear motor is 180° electrical angle. The stator has no mechanical displacement, and the front motor and rear motor share the common armature winding. III. ELECTROMAGNETIC PERFORMANCE ANALYSIS Figs. 2 (a) and (b) show the flux linkage and back-EMF of the three PMAMs, respectively. Compared with SS-FMPMAM, both DS-FMPMAM and PCDS-FMPMAM can provide twice the flux linkage and back-EMF. Figs. 2 (c) and (d) compare the torque characteristics of the three motors. The results show that the DS-FMPMAM and PCDS-FMPMAM has 50% higher torque than the SS-FMPMAM. Compared with DS-FMPMAM, the torque ripple of PCDS-FMPMAM has also been reduced by about 50%. Therefore, the PCDS-FMPMAM has the best motor performances in the three PMAMs. More design considerations and results analysis will be given in the full paper.References: [1] C. J. Jian, M. W. Li, and H. J. Long, “Design and optimization of arc permanent magnet synchronous motor used on large telescope,” IEEE Trans. Magn., vol. 48, no. 5, pp. 1943-1947, May 2012. [2] Y. Meng, S. Fang, Y. Zhu, Y. Yu, L. Qin, “Investigation of new dual-stator consequent-pole flux reversal permanent magnet arc machines,” IEEE Trans. Appl. Supercon., vol. 34, no. 8, Nov. 2024, Art. no. 5204105.