Influence of Demagnetization on Selecting the Optimum Slot/Pole Number Combination for 3MW Surface Mounted Permanent Magnet Vernier Machine

Electromagnetic performance of Vernier machines largely depends on choosing the correct slot/pole number combinations. For a given gear ratio, designs with different slot/pole number combinations are possible. This paper investigates the impact of these slot/pole number combinations on electromagnet...

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Bibliographic Details
Published in:	2019 22nd International Conference on Electrical Machines and Systems (ICEMS) pp. 1 - 6
Main Authors:	Kumar, D.K.P, Li, G.J., Zhu, Z.Q, Foster, M. P., Stone, D. A., Griffo, A., Odavic, M., Clark, R., Thomas, A.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-08-2019
Online Access:	Get full text
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Summary:	Electromagnetic performance of Vernier machines largely depends on choosing the correct slot/pole number combinations. For a given gear ratio, designs with different slot/pole number combinations are possible. This paper investigates the impact of these slot/pole number combinations on electromagnetic performance such as torque, power factor and demagnetization. The study is carried out through detailed finite element analysis on a 3MW outer rotor direct drive generator targeted at wind power application. The torque/cost, torque/mass and efficiency, which are critical parameters for this application, are compared with a conventional direct drive PM generator. The study shows that Vernier designs with lower values of slot/pole number combinations exhibit much better performance in terms of torque and power factor. However, the potential magnet demagnetization and also core saturation limit these designs and hence play a critical role in selecting the optimal slot/pole number combination.
ISSN:	2642-5513
DOI:	10.1109/ICEMS.2019.8921618