Abstract
To improve the torque performance of the permanent magnet vernier machine in the direct-drive system for Unmanned Aerial Vehicle (UAV), this paper proposes the topology of non-uniform tooth distribution. This distribution, considering the additional flux harmonics, aims to contribute to torque improvement, whereas the cogging torque also increases at the same time. A phasors method is proposed to solve the issue caused by the non-uniform structure, adjusting the mechanic angle of each tooth reasonably to restrict the cogging torque. In addition, the non-uniform design is illustrated in detail, which includes the method of grouping the teeth, considering the factors of series pole ratio and winding layout. By using the three-dimensional finite element method, torque is significantly increased without additional torque ripple, which satisfies the desired design target.
Highlights
In recent years, the Unmanned Aerial Vehicle (UAV) [1] with long endurance has become a hot topic, where the reliable electrical drive systems with high-torque/power density machine have been discussed in research
These harmonics have a positive effect on machine performance, which represents the superiority of non-uniform tooth distribution
This paper proposes a non-uniform tooth distribution for the open-slot permanent magnet vernier machine (PMVM) to imBack-EMF
Summary
The Unmanned Aerial Vehicle (UAV) [1] with long endurance has become a hot topic, where the reliable electrical drive systems with high-torque/power density machine have been discussed in research. As a competitive direct-drive machine, the permanent magnet vernier machine (PMVM) has recently been employed [2,3]. This is because the PMVM can cause the “flux modulation” by utilizing its magnetic field modulation teeth, which increases the composition of the flux harmonics to result in the features of low-speed and high-torque [2]. This characteristic is suitable for direct-drive, because of excluding the requirement of mechanical transmission gear box. An axial-flux PMVM [13]
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