Abstract
This paper presents a five-phase permanent magnet (PM) vernier machine topology equipped with a two-slot pitch winding. The two-slot pitch winding provides a trade-off between fractional slots concentrated winding (FSCW) and integrated slot distributed winding (ISDW) PM vernier machines. First, the development and basic structure of the fivephase PM vernier machine with auxiliary teeth are depicted. Then, the PM vernier machine with proposed two-slot pitch fractional slot winding is explained. Finally, the five-phase PM vernier machines with conventional ISDW and FSCW configuration are analyzed and compared with the proposed PM vernier machines with two-slot pitch fractional slot winding. The benefits of introducing two-slot pitch windings are quantitatively analyzed and verified by finite-element analysis (FEA). This analysis confirms that a higher back EMF and torque density can be achieved in this topology while keeping a reasonable power factor.
Highlights
Permanent magnet (PM) vernier machines have become promising candidates in low-speed high torque applications due to their high torque density and suitability for low speed operation [1] [2].The permanent magnet (PM) vernier machine can be seen as a single airgap field-modulated machine, which was firstly studied in [1] [2], where the design and operational principle have been presented; and their higher torque density capability due to the field modulation or magnetic gearing effect has been explained
A five-phase permanent magnet (PM) vernier machine topology equipped with two-slot pitch winding is proposed, which can be regarded as a compromise solution between the fractional slots concentrated winding (FSCW) and integrated slot distributed winding (ISDW) PM vernier machine
The PM vernier machine with ISDW configuration has a higher gear ratio and higher output torque but with a lower power factor while the PM vernier machine with FSCW configuration is the on the contrary
Summary
Permanent magnet (PM) vernier machines have become promising candidates in low-speed high torque applications due to their high torque density and suitability for low speed operation [1] [2]. The power factor could be improved to 0.8 or even 0.9 if a spoke-array rotor topology is used This is attributing to their flux-concentrated effect improving back EMF and a thicker magnet thickness gives a lower reactance. A five-phase permanent magnet (PM) vernier machine topology equipped with two-slot pitch winding is proposed, which can be regarded as a compromise solution between the FSCW and ISDW PM vernier machine. The performance comparison with conventional ISDW and FSCW configuration will be studied to demonstrate the superiority of the proposed PM vernier machine with two-slot pitch winding in terms of torque capability and power factor
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