Abstract
This paper presents a novel topology of dual airgap radial flux permanent magnet vernier machine (PMVM) in order to obtain a higher torque per magnet volume and similar average torque compared to a conventional PMVM machine. The proposed machine contains two stators and a sandwiched yokeless rotor. The yokeless rotor helps to reduce the magnet volume by providing an effective flux linkage in the stator windings. This effective flux linkage improved the average torque of the proposed machine. The competitiveness of the proposed vernier machine was validated using 2D finite element analysis under the same machine volume as that of conventional vernier machine. Moreover, cogging torque, torque ripples, torque density, losses, and efficiency performances also favored the proposed topology.
Highlights
The direct-drive systems have been an attractive solution to eliminate the mechanical gears and achieve high torque at low speed, low noise, very low vibrations, and high reliability
PSMS yokeless rotor models with the same NdFeb bonded type magnets, we clearly found that the average torque in the permanent magnet synchronous machine (PMSM) model was 2.5 times less than the permanent magnet vernier machine (PMVM)
There was an error in the assembly of the manufactured model, which was confirmed by the phase shift in the back electromotive force (EMF) of outer and inner stators
Summary
The direct-drive systems have been an attractive solution to eliminate the mechanical gears and achieve high torque at low speed, low noise, very low vibrations, and high reliability. These systems are very eagerly pursued in applications such as wind power generations, elevators, and ship propulsions. For low-speed operations, the machine needs to have a large pole number and large slot numbers, which increases the overall size of the machine [1]. The armature winding is relatively difficult for high torque, low-speed machines due to a large number of poles. The stator end windings length is increased for a large number of slots, which in turn increases the overall copper losses in PM machines [2]
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