There will never be a perfect standard.
永远不会有十全十美的标准。
The selection of PM material and magnetic structure is important for design of PM starter motor. It is the most important problem for designer to solve, but there is no perfect standard to be adopted.
永磁材料和磁极结构的选择直接关系到永磁起动机设计的成败，是永磁起动机设计者首先应当解决的问题，目前尚无完善的选择原则。
The selection of PM material and magnetic structure is important for design of PM starter motor. It is the most important problem for designer to solve, but there is no perfect standard to be adopted.
永磁材料和磁极结构的选择直接关系到永磁起动机设计的成败，是永磁起动机设计者首先应当解决的问题，目前尚无完善的选择原则。
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