FBM214电缆P0916DC产品供应

FBM214电缆P0916DC

高速电机的转子速度通常高于10 000 r/min，在高速旋转时，常规叠片转子难以承受巨大的离心力，需要采用特殊的高强度叠片或实心转子结构；对于永磁电机来说，转子强度问题更为突出，因为烧结而成的永磁材料不能承受转子高速旋转产生的拉应力，对永磁体采取保护措施；转子与气隙高速摩擦，在转子表面造成的摩擦损耗远大于常速电机，给转子散热带来很大困难；为了保证转子有足够的强度，高速电机转子多为细长型，因此与常速电机相比，高速电机转子系统接近临界转速的可能性大大增加，为了避免发生弯曲共振，准确预测转子系统的临界转速；普通电机轴承无法在高速下可靠运行，采用高速轴承系统。

高速电机绕组电流和铁心中磁通交变频率很高，会在电机绕组、定子铁心以及转子中产生较大的高频附加损耗。定子电流频率较低时，通常可以忽略趋肤效应和邻近效应对绕组损耗的影响，但在高频情况下，定子绕组会产生明显的趋肤效应和邻近效应，增大绕组附加损耗；高速电机定子铁心中磁通频率高，趋肤效应的影响不能忽略，常规的计算方法会带来较大误差，为了准确计算高速电机的定子铁心损耗，需要探索高频工况下的铁耗计算模型；定子开槽与绕组非正弦分布引起的空间谐波以及PWM供电产生的电流时间谐波均会在转子中产生较大的涡流损耗，由于转子体积小、散热条件差，会给转子散热带来困难，因此转子涡流损耗的准确计算以及探索有效降低转子涡流损耗的措施，对高速电机可靠运行具有重要意义；同时，高频电压或电流也给大功率高速电机的控制器设计带来了挑战。

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