Mechanical design of rotors for permanent magnet high speed electric motors for turbocharger applications

What is it about?

This paper presents a method of calculating the stresses in rotating cylinders which have an interfering outer sleeve. This type of structure is often used as the rotor for high speed electric machines. The analysis method proposed removes the need to carry out complex and time consuming analysis using the finite element method.

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Why is it important?

The sleeved rotors in permanent magnet, high speed electric machines are subjected to high centripetal loads which can lead to failure. Stress analysis is therefore required to mitigate this risk. Previous closed form solution methods have not correctly accounted for axial load transfer between the inner cylinder and sleeve. The solution presented in this paper corrects this flaw.