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AB产品22A-V2P3H204
- 更新时间:2025-05-13
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欧阳 先生(销售)
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22A-V2P3H204
22A-V2P3H204
首先,普通电机不能当变频电机使用。普通电动机是按恒频恒压设计的,不可能完全适应变频器调速的要求,因此不能多做变频电机使用。
(1)变频器对电机的影响主要在电动机的效率和温升 变频器在运行中能产生不同程度的谐波电压和电流,使电动机在非正弦电压、电流下运行,里面的高次谐波会引起电动机定子铜耗、转子铜耗、铁耗及附加损耗增加,为显著的是转子铜耗,这些损耗会使电动机额外发热,效率降低,输出功率减小,普通电动机温升一般要增加10%-20%。
(2)电动机的绝缘强度问题
变频器载波频率从几千到十几千赫,使得电动机定子绕组要承受很高的电压上升率,相当于对电动机施加陡度很大的冲击电压,使电动机的匝间绝缘承受较为严重的考验。
(3)谐波电磁噪声与震动
普通电动机采用变频器供电时,会使由电磁、机械、通风等因素所引起的震动和噪声变的更加复杂。变频电源中含有的各次谐波与电动机电磁部分固有空间谐波相互干涉,形成各种电磁激振力,从而加大噪声。由于电动机的工作频率范围宽,转速变化范围大,各种电磁力波的频率很难避开电动机的各结构件的固有振动频率。
(4)低转速时的冷却问题 当电源频率较低时,电源中的高次谐波所引起的损耗较大;其次变通电机转速降低时,冷却风量与转速的三次方成正比减小,致使电机热量散发不出去,温升急剧增加,难以实现恒转矩输出。
Rexroth Indramat MTS-R01.2-M2-B1.FW #10952
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INDRAMAT CONTROLLER CARD 109-0785-4A20-06
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