转子电阻计算.docx

1、转子电阻计算转子电阻的计算步骤如下：（1）计算公式q(用转差率几何平均法）1.计算S0同步提升速度 转差率2.计算转差率Spz加速平均力矩 M1p=2377N m电动机最大额定力矩N m电动机最大力矩Me=2.13790=7960N m电动机额定转差率=0.02最大力矩的转差率转差率3.计算公比q=(N+0.5) 4.检验上下切换力矩M1、M2允许最大上下切换力矩 M1max=0.9Mm=0.97960=7164N m上切换力矩加速段静阻力加速段静阻力矩允许最小下切换力矩下切换力矩通过的检验知，公比1.811合适(2)各级电阻阻值计算1.转子绕组每相电阻2.第一预备级电阻3.第二预备级电阻计算

2、电动机额定力矩Fn=初加速时平均力相对值第二预备级电动机产生的转矩相对值第二预备级电阻查P62矿山电力拖动与控制对于箕斗提升有S11=Si=0.618S10=S20=R20=4.加速级电阻RtR6=R20q=0.00971.811=0.0176 R5=R6q=0.01761.811=0.0318R4=R5q=0.03181.811=0.0576 R3=R4q=0.05761.811=0.104 R2=R3q=0.1041.811=0.189 R1=R2q=0.1891.811=0.3425.每段电阻阻值RtRy1=Ry1Ry2=3.9780.785=3.193Ry2=Ry2R1=0.7850.

3、342=0.443R1=R1R2=0.3420.189=0.153R2=R2R3=0.1890.104 =0.085R3=R3R4=0.1040.0576=0.0467R4=R4R5=0.05760.0318=0.0258R5=R5R6=0.03180.0176=0.0142R4=R6R20=0.01760.0097=0.0079（3）转子电阻的选配1.各段电阻通过电流的计算第一预备级电流Iy1=0.3I2e=0.3357=107.1A第一预备级电流Iy2=加速级电流2.各段电阻通电时间计算第一预备级第一预备级各级电阻上的加速时间t6=t0q=0.05431.811=0.098st5=t6q=

4、0.0981.811=0.177st4=t5q=0.1771.811=0.321st3=t4q=0.3211.811=0.582st2=t3q=0.5821.811=1.054st1=t2q=1.0541.811=1.909stpr2 取初加速时间3.12 s，tpr1取0.75s3.各段电阻JC值计算第一预备级电阻暂选40号电阻箱，T=547S2 该段按JC=40%第二预备级JC=JC=JC2=4.将电流折算成JC=100%时的电流 5.根据算出的和电流I，从Z1X1型金属电阻箱中选出各段电阻如下表每相各段电阻箱电阻段计算值相电阻电阻JC=100%电流A箱号允许电流A采用电阻电阻片数片箱数箱Ry13.19367.7455643.19055#583Ry20.44332.60110460.440110#41R10.15393.17141280.15414#111R20.085104.58141280.08414#61R30.0467108.7271810.0497#71R40.0258110.9752160.0255#51R50.0142112.0852160.0155#51R60.0079112.8671810.0073#11