电机绝缘等级F，温升按B级是什么意思？

Question

如题，谢谢！
非常谢谢一楼的回答！为什么要说绝缘F级，温升要按B级呢？为了保护电机吗？非常谢谢。

另外B级的话是不是130-80=50，环境温度不低于50度吗？呵呵，极度谢谢，加分。。

那么性能参考温度是什么意思呢？加20分，谢谢！

Answer 1

就告诉你，FB的要求比FF的要求要高，具体对温升做了限制。也就是130℃用了155℃的耐热材料。

Answer 2

应该是155-80=75吧

Answer 3

按B级80

Answer 4

Answer 5

温升按B级，电机稳定运行的温升最高80K, 而不是F级的105K, 电机设计要求更高，这样温升相对于F级的绝缘等级，多出25K的安全温升余量，电机使用寿命更长。看图更容易理解。

以下引用国外论坛的解释：

When specifying (buying) a motor there are a couple of options. An insulation class could be specified and the motor specified as designed to run within that class. Alternatively the motor could be specified for an insulation class, but be design to run at a low class (for example insulation class 'F', temperature rise 'B').

The advantage of the second method is that there is an inherent 25 oC safety margin - useful if you are in a region with high ambient temperatures or need to date the motor for some other reason. Running motors at a reduced temperature will also significantly extend the useful life.