High speed permanent magnet synchronous machine(PMSM) requires an alloy sleeve for fastening the magnets to a rapidly rotating rotor which has a feature of cylindrical or annulus permanent magnet. In order to cool rotors richly, reduce eddy loss and get the lowest possible weight, the air gap of motors should be as thick as possible by decreasing the thickness of the alloy sleeve. However, a smaller permanent magnet will not produce enough power density for the reason that it induces a significant decrease in the air gap flux density. Meanwhile smaller sleeve thickness will result in significant decrease in the strength of extension. Therefore, the strength of the sleeve and the permanent magnet must be checked to meet the design requirements of strength and air gap flux density. In this paper, a 2-D analytical formulas deduction of magnetic field of permanent magnet and rotor stress are presented to show the dimensionless size relations of the permanent magnet and alloy sleeve. A design guideline of the high speed interference fit alloy rotor is obtained through an optimal analysis. A group of optimized sizes of the rotor is presented after calculating of search algorithm when the design requirements of strength, air gap flux density, transitive torque and critical speed are simultaneously met. As optimal goals, the thickness is decreased and the inter-air space is increased.
On an Optimum Design Method for Rotor Size of High Speed PMSM
Lect. Notes Electrical Eng.
2021-10-30
10 pages
Article/Chapter (Book)
Electronic Resource
English
On an Optimum Design Method for Rotor Size of High Speed PMSM
TIBKAT | 2022
|British Library Conference Proceedings | 2005
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