ASSY#68-0208-03B0/73-1669-06B0

ASSY#68-0208-03B0/73-1669-06B0

由于电动机工作频率范围宽，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构件的固有震动频率。当电磁力波的频率和电动机机体的固有振动频率一致或接近时，将产生共振现象，从而加大噪声。
4、电动机绝缘强度
目前中小型变频器，不少是采用PWM的控制方式。载波频率约为几千到十几千赫，这就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酷的考验。
另外，由PWM变频器产生的矩形斩波冲击电压叠加在电动机运行电压上，会对电动机对地绝缘构成威胁，对地绝缘在高压的反复冲击下会加速老化。
5、电动机的效率和温升
不论那种形式的变频器，在运行中均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。
以目前普遍使用的正弦波PWM型变频器为例，其低次谐波基本为零，剩下的比载波频率大一倍左右的高次谐波分量为：2u+1(u为调制比)。高次谐波会引起电动机定子铜耗、转子铜(铝)耗、铁耗及附加损耗的增加，最为显着的是转子铜(铝)耗。
因为异步电动机是以接近于基波频率所对应的同步转速旋转的，因此，高次谐波电压以较大的转差切割转子导条后，便会产生很大的转子损耗。
除此之外，还需考虑因集肤效应所产生的附加铜耗。这些损耗都会使电动机额外发热，效率降低，输出功率减小，如将普通三相异步电动机运行于变频器输出的非正弦电源条件下，其温升一般要增加10%–20%。
 
随着变频器技术的快速发展，变频调速技术在各种电机应用方案中已成主流。通用变频器在工业领域的应用为企业大大的节约了资源，降低了企业的成本，保护了生产设备。那么企业该怎么选择合适的通用变频器的呢？下面变频器厂家就详细的介绍一下：
正确选用变频器对于机械设备的传动控制系统的正常运行时非常重要的，避免因选型错误，引发设备故障，造成不必要的损失。首先应明确选用变频器的目的，其次在根据设备类型、负载特性、调速范围、控制方式、使用环境、防护结构等要求来选择合适的变频器。以此，来达到既满足生产工艺，又实现经济效益的目的。






 
 
 
 
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