西门子电源6ES7307-1EA01-0AA0

6ES7307-1EA01-0AA0

电功率是有功功率，所以效率高就意味着节能。功率因数影响的是视在功率，与节能没有直接的关系。

输入功率与输出功率之差是损耗，损耗越小效率越高。

工频运行的三相异步电动机，损耗通常可分为五部分：定子铜耗、定子铁耗、转子铜(铝)耗、 风摩(机械)耗和杂散损耗。

定子铜耗与定子电阻、电流有关；定子铁耗通常包含空载杂散损耗，与硅钢片材质、叠压工艺、磁通密度和电源频率有关；转子铜耗与电机的输出功率和转差率成正比；风摩耗由轴承摩擦和旋转件的空气阻力产生，与电机转速有关；杂散损耗一般特指负载杂散损耗，与输出转矩成正比，也与电机的电磁设计、工艺方法和制造水平有关。总来的说，定子铜耗和铁耗是电机损耗的主要部分。

可以看出，电机做好后电压额定时，定子铁耗和风摩耗与负载大小(输出功率)几乎无关，两者之和称为恒定损耗；定子铜耗、转子铜耗和杂散损耗随负载变化而变化，是可变损耗。显然，负载越大可变损耗随之增加。好的设计，是电机在额定负载时恒定损耗约等于可变损耗，这时电机有较高的效率。

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