xvme203-293娄底市
变频器箱体结构的选
变频器的箱体结构要与环境条件相适应，即考虑温度、湿度、粉尘、酸碱度、腐蚀性气体等因素。常见有下列几种结构类型可供用户选用：
1）敞开型IPOO型本身无机箱，适用装在电控箱内或电气室内的屏、盘、架上，尤其是多台变频器集中使用时，选用这种型式较好，但环境条件要求较高；
2）封闭型IP20型适用一般用途，可有少量粉尘或少许温度、湿度的场合；
3）密封型IP45型适用工业现场条件较差的环境；
4）密闭型IP65型适用环境条件差，有水、尘及腐蚀性气体的场合
变频器容量的确定
合理的容量选择本身就是一种节能降耗措施。根据现有资料和经验，比较简便的方法有三种：
1）电机实际功率确定发。测定电机的实际功率，以此来选用变频器的容量。
2）公式法。当一台变频器用于多台电机时，应满足：至少要考虑一台电动机启动电流的影响，以避免变频器过流跳闸。
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