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1、 Abstract Magnetic gear is becoming attractive due to its significant features, such as reduced acoustic noise, maintenance- free and inherent overloaded protection. In this paper, a magnetic-geared double salient permanent magnet machine is presented. The key is to newly add the flux-modulated teet
2、h in the outer part of the stator pole. Both finite element analysis and experimental results show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors, but offers the performances of low-speed and high- torque. I. INTRODUCTION In order to transmit torq
3、ue or force between separate parts, the motor with mechanical gearboxes are extensively used in a variety applications. Since the mechanical gearboxes are contact mechanisms, transmission loss, gear noise and regular lubrication are inevitable. Recently, the conception of coaxial magnetic gear has b
4、een paid much attention, Fig. 1 shows a coaxial magnetic gear1, the type of magnetic gear have some distinct advantage, such as reduced acoustic noise, high power density, improved utilization of permanent magnets and inherent overload protection. By incorporating a coaxial magnetic gear into the co
5、nventional PM machine directly, the coaxial magnetic-geared PM motor can developed for electric vehicles and wind power generation where low-speed high- torque and direct drive are being sought 2. However, the proposed coaxial magnetic-geared PM motor is often associated with complex structure since
6、 it involves three airgaps and two rotating bodies, which increases manufacture difficulty and cost significantly 3-4. To alleviate the complexity, an improved version termed a MG out-rotor motor, as shown in Fig. 2, is proposed 5, in which a stationary armature is employed to replace the inner high
7、- speed rotor in the magnetic gear. Compared with the simple radial combination of the magnetic gear and PM motor, the motor reduce the material of PMs, overall size and weight, but still involving two airgaps 6. Veriner reluctance machines also draw much attentions in recent years since they have o
8、uter standing features of providing low speed operation with high torque output 7. Based on the sane magnetic gear effect, the vernier machine can produce specific space harmonics in the airgap magnetic field, while avoiding the increase of the number of armature winding pole-pairs and slot numbers.
9、 In order to improve the power density, the vernier reluctance machine incorporate PMs on the rotor to provide the excitation, thus becoming the rotor-PM vernier machine 8-9. Normally, a high electric loading is often employed to increase the torque density in the low speed operation. However, the m
10、aximum electric loading of conventional rotor-PM vernier machines having permanent magnets on the rotor may be limited by the allowable temperature rise of the magnets and need to prevent partial irreversible demagnetization 10. When the magnets are placed on the stator, as in stator-PM machines, th
11、eir temperature rise may be more easily managed and the risk of demagnetization is reduced significantly 11-12. Fig.1. Topology of magnetic gear 1. Fig.2. Topology of magnetic-geared outer-rotor motor 5. In this paper, to incorporate the effect of magnetic gear and vernier machine into the outer-rot
12、or stator permanent magnet (S-PM) motor, a novel magnetic-geared doubly salient permanent magnet (MG-DSPM) machine is presented, which not only offers the low rotational speed and high power density, but also solves the problems of complex structure and manufacture difficulty. II. MOTOR TOPOLOGY Fig
13、.3 shows the proposed MG-DSPM motor. The motor consists of an inner stator that includes PMs, stator steel A Novel Magnetic-geared Doubly Salient Permanent Magnet Machine for Low-Speed High-Torque Applications Xiaoyong Zhu*,Yanbiao Sun, Li Quan, Qian Ding School of Electrical and Information Enginee
14、ring, Jiangsu University, Zhenjiang, 212013, China E-mail: zxyff laminations and armature windings, and the outer rotor that includes only steel laminations, which is similar to the traditional DSPM machine 13. It is noticed that the originality of this motor topology is to purposely add three flux-
15、modulated teeth in the outer part of the every stator pole. The flux-modulated teeth can modulate the space harmonics of the airgap magnetic field, which resemble the ferromagnetic segments of the stationary ring in the coaxial magnetic gear, to modulate the high-speed rotating field of the armature
16、 windings and the low-speed rotating field of the outer rotor. Compared with the previous designs, the proposed motor takes several distinct advantages for low-speed high-torque operations. Firstly, the motor has only one airgap, which is much simpler than the magnetic-geared PM machines which often involves three airgaps or two airgaps. Secondly, the solid outer rotor is simply composed of salient poles with no PMs or windings, hence offering high mechanical robustne
