选型表公式(Selection table formula):

制动电阻器的阻值：R Braking Resistor’s Resistance Value:R

U²dc：所选变频器制动回路的斩波电压 U²dc：Voltage value of chopper wave of inverter’sbraking circuit

K:所需的制动转矩倍数1.2-2.0 K:所需的制动转矩倍数1.2-2.0

P：所选变频器的功率 P:The power of the invert

Po:电机的功率

Po:the power of electric motor

△K：制动电阻器短时工作允许过负荷倍数，具体数值根据工况查图取值

△K：folds of allowable transient operating overload.The exact value shall be

deternined by referring to the chart according to operating conditons.

P1:系统所需的平均制动功率

P1:the average braking power that the system requires.

η：传动效率，传动的机械系统在制动时，提供与效率相应的制动阻尼

η：transmission efficiency.The mechanical system of transmission provides braking damp

corresponding to the efficiency when it is functioning.

0.2：电动机的内阻消耗20%的制动能量

0.2:the internal resistance consumes 20% braking energy.

ED制动率以100s运行为一个周期，制动时间所占比率根据制动电流Udc/R与制动率ED选择制动单元

ED brake ratio is the percentage of braking time based on a 100-second operating

cycle.the selection of brake unit shall be carried out in accordance with brakd current Udc/R and brake ratio ED.