3.结束语
理论上的分析可以证实，该计划思路是完全合理的。实践中，变频器选用直流制动并配适合当的直流制动时间，初步频率和制动准位所发作的电机刹车作用也比照明显。
选择精确的变频器制动电阻是保证制动作用并避免设备损坏的必要条件：
    首要要计算制动功率并制造精确的制动曲线；再根据制动曲线判定制动周期及制动功率；根据所判定的制动功率及制动周期，一同参看电压、阻值等条件选择适合的制动电阻；所选制动电阻阻值不能小于选型手册中规矩的数值，否则将直接构成变频器损坏！这在电阻选型时应予以说明。
    有时候制动功率欠好判定，或为了保证安全，可选择制动功率较大的电阻；西门子标准传动产品供给的MM4系列制动电阻均为5％制动周期的电阻，所以在选型时应加以留心；制动周期在参数P1237中选择；一同应将P1240设置为0用以禁止直流电压控制器。

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