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E形铁芯,铁片在外,线圈在内,形成“铁包铜”之势;环形铁芯,线圈在外,铁片在内,形成 “铜包铁”。显然,环形铁芯线圈露在外面的表面积大,散热良好,漆包线单位面积的截流量可取 ,得大些,漆包线的直径就可选得小一点,线圈线径小,节省漆包线。总之,线圈数少、长度短、线径细,漆包线材料消耗低。产品实际的用料比E形节省60%,仅用五分之二的漆包线就能生产一只合格的电感.
