理想变压器在现实世界中是不存在的，但我们在一些不用很精确的场合，可以把缠绕很多匝的、耦合紧密的铁芯变压器近似为理想变压器，比如电力系统中的变压器。
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考虑到变压器的励磁电感一般都很大，励磁电流 相比负载电流 小很多，励磁支路可以移到左侧端口，这样就得到了变压器的 Γ 型等效电路：
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作为电源领域的主角，变压器因为涉及到互感磁路，总有诸多令人费解之处。本文从最基本的物理原理讲起，抽丝剥茧，一步一个脚印讲透其工作原理。
铁损是交变磁场在铁芯上产生的损耗，又分为涡流损耗和磁滞损耗两种，其大小与电压和频率相关较大，跟负载关系不大，即使空载，铁损也是一直存在的，所以铁损又叫空载损耗。
目前人力资源部门的常规模型，在不同规模的企业中都会涉及，大型的明星企业/人力资源重视度较高的企业也大多以此模型为一个基础，再做模型的进一步延伸。
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