| 型号 : | IC697MDL752 | 品牌 : | GE/通用电气 |
| 加工定制 : | 否 | 产品认证 : | 已认证 |
| 输出频率 : | 2220kHz | 工作电压 : | 220V |
IC697MDL752
IC697MDL752
IC697MDL752
IC697MDL752
制动电阻是用于将电动机的再生能量以热能方式消耗的载体，它包括电阻阻值和功率容量两个重要的参数。通常在工程上选用较多的是波纹电阻和铝合金电阻两种：波纹电阻采用表面立式波纹有利于散热减低寄生电感量，
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《QQ邮箱：2479261344@qq.com》并选用高阻燃无机涂层，有效保护电阻丝不被老化，延长使用寿命，台达原厂配置的就是这样的电阻；铝合金电阻易紧密安装、易附加散热器，外型美观，高散热性的铝合金外盒全包封结构，具有极强的耐振性，耐气候性和长期稳定性；体积小、功率大，安装方便稳固，外形美观，广泛应用于高度恶劣工业环境使用。
3 制动电阻的阻值和功率计算
3.1刹车使用率ED%
制动使用率ED%,也就是台达说明书中的刹车使用率ED%。刹车使用率ED%定义为减速时间T1除以减速的周期T2,制动刹车使用率主要是为了能让制动单元和刹车电阻有充分的时间来散除因制动而产生的热量；当刹车电阻发热时，电阻值将会随温度的上升而变高，制动转矩亦随之减少。刹车使用率ED%=制动时间/刹车周期=T1/T2*。（图1）
图1刹车使用率ED%定义
现在用一个例子来说明制动使用率的概念：10％的制动频率可以这样理解，如果制动电阻在10秒钟能够消耗掉100％的功率，那么制动电阻至少需要90秒才能把产生的热量散掉。
3.2 制动单元动作电压准位
当直流母线电压大于等于制动电压准位（甄别阈值）时，刹车单元动作进行能量消耗。台达制动电压准位如表1所示。
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