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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Higher strength steels for magnetic applications in motors
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Higher strength steels for magnetic applications in motors

机译：Higher strength steels for magnetic applications in motors

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摘要

Motors are essential components in electric vehicles and there are at present worldwide efforts to improve their efficiency and reduce their weight. One of these areas concerns improving the qualityof steel laminations that are used for their magnetic properties in rotors and stators. These are 'soft' magnetically, meaning that they canbeeasily magnetised and demagnetised. Improve-mentsinmagneticquality,i.e. reductionsinpowerloss duringmagnetisation,havebeenpursued for many years but the high-speed motors in vehicles are also subject to greater mechanical loading, in particular in the rotors of IPM-machines (Internal Permanent Magnet rotor machines). These are the dominating typeofelectric motor for electrified vehicles dueto their high efficiency and high power/torque density.Asaresult, there are increasing requirements for new steel products that combine low power losses with high strength. This is difficult because most ways of raising the strength resultin the magnetic characteristics becoming also undesirably harder. The present paper starts with a consideration of how magnetic power losses are defined and the factors that influence these. Then, different strengthening methods are considered together with their effects on magnetisation. Strengthening can be achieved by (i) solid solution alloying, (ii) grain refinement, (iii) work hardening, (iv) precipitation and (v) texture control. Most commonly, the requirements are in conflict. Only solid solution strengthening can confer benefits to both strength and power loss although extremely fine nanoprecipitation can raise the strength with little or no magnetic detriment. Based on this analysis, results from research publications and patents are summarised and reviewed.

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