A Novel Modular Stator Fractional Pole-Pair Permanent-Magnet Vernier Machine With Low Torque Ripple for Servo Applications
A Novel Modular Stator Fractional Pole-Pair Permanent-Magnet Vernier Machine With Low Torque Ripple for Servo Applications
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DOI：
10.1109/tmag.2020.3017663
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发表时间：
2021-02
影响因子：
2.1
通讯作者：
Rui Li;C. Shi;R. Qu;Dawei Li;Xiang Ren;V. Fedida;You Zhou
中科院分区：
文献类型：
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作者：
Rui Li;C. Shi;R. Qu;Dawei Li;Xiang Ren;V. Fedida;You Zhou
近年来，由于航空航天和电子工业的发展，高精度伺服系统引起了人们的广泛关注。根据伺服系统的要求，必须将电机转矩涟漪（包括空载齿槽转矩和负载转矩涟漪）控制在较低的水平，以达到较高的精度。无铁心永磁电机具有零齿槽转矩和低转矩涟漪的特点，常被应用于高精度伺服系统中。但是，无铁心永磁电机存在转矩密度低、永磁消耗大等缺点，使得系统体积大、价格昂贵。永磁游标电机（PMVM）也研究了其低转矩涟漪和大的转矩密度，由于通过所谓的磁齿轮效应的伺服应用。但其转矩涟漪仍明显大于无铁心永磁电机。为了同时实现低转矩涟漪和大转矩密度，提出了一种新型的模块化定子分数极对永磁同步电机（MFP-PMVM）。在额定转矩没有明显下降的情况下，所提出的MFP-PMVM的齿槽转矩和转矩涟漪分别比常规PMVM降低了93%和70%。所提出的MFP-PMVM具有接近无铁芯永磁电机的低转矩涟漪，而所提出的MFP-PMVM的转矩密度和PM利用率是无铁芯永磁电机的163%和14倍。基于有限元法（FEM）的结果，所提出的MFP-PMVM的优越性进行了验证。
In recent years, high-precision servo systems have attracted much attention due to the development of aerospace and electronic industries. Given the requirement of the servo systems, the machine torque ripple, including the no-load cogging torque and the load torque ripple, must be limited under a low level to achieve the high precision. The ironless permanent magnet-machine (ironless PMM) is usually adopted in high-precision servo systems due to its characteristics of zero cogging torque and low torque ripple. However, ironless PMM has a lot of drawbacks such as low torque density and large PM consumption, making the system size large and expensive. The permanent-magnet vernier machine (PMVM) is also studied for servo applications for its low torque ripple and large torque density due to the adoption of the so-called magnetic gearing effect. However, its torque ripple is still apparently larger than that of the ironless PMM. In order to achieve low torque ripple and large torque density at the same time, a novel modular stator fractional pole-pair PMVM (MFP-PMVM) is proposed and analyzed in this article. The cogging torque and torque ripple of the proposed MFP-PMVM is 93% and 70% lower than that of the conventional PMVM without an obvious decrease on the rated torque. The proposed MFP-PMVM exhibits a low torque ripple close to the ironless PMM while the torque density and PM utilization of the proposed MFP-PMVM is 163% and 14 times higher than that of the ironless PMM. Based on the finite-element method (FEM) results, the superiorities of the proposed MFP-PMVM are verified.