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Study on rotor mechanical strength of high speed interior permanent magnet motor
Pages: 45-50
Year: Issue:  11
Journal: Electric Machines and Control

Keyword:  interior permanent magnet motorhigh speedmagnetic barriermechanical strengthmag-netic leakage factor;
Abstract: In order to study the rotor mechanical strength of a high speed interior permanent magnet motor ( IPM) , analytic calculation formula for maximum stress of magnetic barrier in extreme cases was derived based on the force balance principle. The influence law of magnetic barrier width on maximum stress was analyzed on the basis of the proposed analytical calculation formula and finite element method. The maxi-mum deviation between analytical calculation results and finite element method results was within 7. 5%, which verified the correctness of the analytical derivation. The permanent magnet was segmented along the circumference direction to increase the number of magnetic barrier, so that the maximum stress was decreased. The mechanical strength and no load magnetic leakage factor were analyzed by finite element method in the case of permanent magnet without segmentation, being divided into 2 segments and being divided into 3 segments. Compared with the unsegmented condition, the maximum stress of magnetic bar-rier can be reduced by 58. 5% for 2 segments, and 71. 2% for 3 segments. The no load magnetic leakage factor increases with the increase of magnet segments.
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