6ES7222-1XF32-0XB0
高速电机需采用高强度转子磁路设计来实现,如日产Leaf 2018、丰田普锐斯4 代、本田i-MMD 等电机均采用高强度转子设计,兼顾电磁性能与结构强度。电机高速化使得转子轴扭振加剧,对壳体和轴的强度提出了更高要求。因此,需采用电机和减速器共壳体来提高壳体模态,从而减少装配误差积累。采用电机轴和减速器轴共轴方案,可以有效减少对中误差积累,减小电机轴扭振强度[9-10]。
此外,由于永磁材料承受转子高速旋转产生的拉应力有限值,转子表面与气隙高速摩擦,摩擦损耗高于常速电机的摩擦损耗。此外,高速电机永磁电机转子硅钢受材料自身硬度和强度限制,难以承受高速带来的巨大离心力。因此许多公司设计高速电机转子采用的整体设计思路是减少电机外径小、加长转子,这样的设计策略可以减少离心力对转子的影响。图1 为AVL 设计的高速电机方案,其整体结构为细长型,高转速为30 000 r/min。
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