永磁直流电机电磁设计算例

1、永永磁磁直直流流电电机机电电磁磁计计算算程程序序和和算算例例: :手工输入公式计算，不可改关键判定，提示说明数据引用序序号号 名名称称一一额额定定数数据据1 额定功率2 额定电压额定转速额定电流额定转矩起动转矩倍数二二主主要要尺尺寸寸及及永永磁磁体体尺尺寸寸选选择择额定效率计算功率感应电势极对数永磁材料类型预计永磁体工作温度永磁体剩磁密度工作时永磁体剩磁密度剩磁温度系数剩磁温度不可逆损失率永磁体计算矫顽力工作时永磁体计算矫顽力永磁体相对回复磁导率真空磁导率工作温度下退磁曲线的拐点电枢铁心材料铁芯叠加系数电负荷预估值气隙磁密预估值计算极弧系数长径比预估值电枢直径电枢长度极距气隙长度永磁体结构型式

2、极弧系数磁瓦圆心角永磁体厚度永磁体轴向长度电枢计算长度永磁体内径永磁体外径电枢圆周速度机座材料机座长度机座厚度计算机座轭磁密漏磁系数机座外径三三电电枢枢冲冲片片及及电电枢枢绕绕组组计计算算绕组型式绕组并联支路对数槽数槽距预计满载气隙磁通预计导体总数每槽导体数每槽元件数每元件匝数实际每槽导体数实际导体总数换向片数实际电负荷支路电流预计电枢电流密度预计导线截面积并绕根数计算导线裸线线径导线裸线线径导线绝缘后线径实际导线截面积实际电枢电流密度实际热负荷槽形选择槽口宽度槽口高度槽下度半径槽上部倒角半径槽上部高度槽上部宽度槽中部高度槽下部宽度槽下部倒角圆心距槽高齿宽槽净面积槽绝缘厚度槽满率线圆平均半匝长

3、度电枢绕组电阻转子冲片内径电枢轭高电枢轭有效高四四磁磁路路计计算算气隙系数气隙磁通密度每对极气隙磁位差电枢齿磁通密度电枢齿磁场强度电枢齿磁位差电枢轭磁通密度电枢轭磁场强度电枢轭磁位差电枢轭部磁路平均计算长度定子轭磁通密度定子轭磁场强度定子轭磁位差定子轭部磁路平均计算长度外磁路总磁位差五五负负载载工工作作点点计计算算气隙主磁导磁导基值主磁导标么值外磁路总磁导直轴电枢去磁磁动势永磁体负载工作点实际气隙磁通六六换换向向计计算算电刷尺寸, 电刷长电刷尺寸, 电刷宽电刷尺寸, 电刷对数电刷面积每杆电刷数电刷电流密度换向器长度一对电刷接触压降换向器直径换向器圆周速度换向器片距换向元件电抗电动势换向元件交轴

4、电枢反应电动势换向元件中合成电动势换向区宽度换向区宽度检查七七最最大大去去磁磁校校核核不同工况时的最大瞬时电流 突然起动时 瞬间堵转时 突然停转时 突然反转时直轴电枢磁动势交轴电枢磁动势换向元件电枢磁动势电枢总去磁磁动势电大去磁时永磁体工作点可逆退磁校核八八工工作作特特性性电枢绕组铜耗电刷接触电阻损耗电枢铁损耗铁损系数电枢齿质量电枢轭质量电刷对换向器的磨擦损耗电刷单位面积压力电刷摩擦系数轴承磨擦和电枢对空气磨擦损耗总机械损耗总损耗输入功率效率电流校核实际感应电动势满载实际转速起动电流起动电流倍数起动转矩起动转矩倍数符符号号或或算算式式单单位位算算例例PNW75.00UNV230.00n Nrp

5、m3,900.00INA0.58TN=9.549*PN/nNN.m0.162832122TstN4.5N =PN/(UN*IN*COS)*100%66.14339889P=(1+2/100)/(3N/100)*PNW87.79666667Ea=(1+(2N/100)/3)*UNV178.086545p1铁氧体t40Bt20 T0.395Br =(1-(t-20)*Br/100)*(1-IL/100)*Bt20T0.3792Br%K-10.2IL%0Hc20KA/M290Hc=(1-(t-20)*Br/100)*(1-IL/100)*Hc20KA/M278.4r=Br/(0*Hc)/10001.

6、0839000430=4*PI*10-71.25664E-06bk0.15DR510-50KFe0.97AA/cm70B=(0.60-0.85)Br =0.8BrT0.30336i=0.6-0.750.7=0.6-1.50.63永永磁磁直直流流电电机机电电磁磁计计算算程程序序和和算算例例: :Da=(6.1*P*104/*A*B*nN*)1/3cm5.264543122电枢直径圆整cm5.24La=Dacm3.3012电枢长度圆整cm3.3=PI*Da/(2p)cm8.230972752cm0.08瓦片形P, P=I0.72P, P=P*180()129.6hM0.85LM, LM=Lacm3

7、.3LM, LM=(1.1-1.2)Lacm3.96Lef,Lef=La+2cm3.46Lef,Lef=La+La(hM+)cm3.6168La=(0.45-0.5)(LM-La)/(hM+)0.340645161Dmi=Da+2cm5.4Dmo=Dmi+2hMcm7.1Va=pi*Da*nN/6000m/s10.70026458-Lj=(2.0-3.0)La, 取Lj=2.8Lamm9.24hj=*i*Lef*B/(2*Lj*Bj)cm0.259340811机座厚度圆整cm0.25Bj, Bj=(1.5-1.8)TT1.6, =(1.11.3)1.213Dj=Dmo+2hj7.6单叠a, a

8、=p1Q16t2=pi*Da/Qcm1.028871594=*Lef*B*10-4Wb0.000632167N=60*a*Ea/(p*nN)4333.968375NS=N/Q270.8730234u1WS=NS/(2*u)135.4365117每元件匝数圆整为Ws135Ns=2*u*Ws270N=Q*Ns4320K=u*Q16A=N*IN/(2*pi*a*Da)76.10279111Ia=IN/(2*a)0.29j2=5-13A/mm7ACua=Ia/j20.041428571Nt1d0=(4ACua/PI)1/20.229670406d0mm0.23dmm0.25ACUa=PI*Nt*d02

9、/4mm0.041547563j2=Ia/ACUa6.979952136=AJ2531.1938393半梨形槽b02cm0.27h02cm0.115r22cm0.2r23cm0.1h2, h2=r23cm0.1d1cm0.695h22cm0.723d2cm0.4d3cm0.495ht2cm1.138bt2, 近似取平行齿cm0.249441291As=PI*(r222+r232)/2+h22(d1+2r22)+r23*d3-Ci(PI*r22+2*h22+d1)cm0.46018799Cicm0.023Sf=Nt*Ns*d2/As%36.66979661Lav=La+Ke*Da, Ke=(1.

10、35,p=1)cm10.374Ra=*N*Lav/(4*Acua*a2)Ra20(a20=0.1785*10-3.mm2/cm)48.13518732Ra75(a75=0.217*10-3.mm3/cm)58.51728654Di2, Di2=(0.15-0.25)Damm0.786转子冲片内径圆整mm0.8hJ2=(Da-2*ht2-Di2)/2mm1.082hj21=hj2+Di2/8mm1.182 K, K=(1.01-1.1) 1.089B=*104/(*Lef)T0.269372444F=1.6*K*B*104A375.4836378Bt2=t2*Lef*B/(bt2*La*Kfe)

11、T1.255407786Ht2 (查磁化曲线图表)A/cm65Ft2=2*ht2*Ht2A147.94Bj2=*104/(hj21*La*Kfe)T0.835408457Hj2 (查磁化曲线图表)A/cm21Fj2=Lj2*Hj2A62.08101243Lj2=PI*(Dj2+hj2)/2pcm2.956238687Bj=*104/(2*hj*Lj)T1.659781192Hj1, Hj1(查磁化曲线图表)A/cm36Fj1=Lj1*Hj1A415.6327081Lj1=PI*(Dj-hj)/2pcm11.545353F=F+Ft2+Fj2+Fj11001.137358=/F6.31449E-

12、07-0.00063Lbcm0.6bbcm0.53pb 1Ab=Lb*bbcm0.318Nb1Jb=IN/(Nb*pb*Lb*bb)A/cm21.823899371Lkcm1.4UbV2.5DK, DK=(0.5-0.9)Dacm3.2Vk=PI*DK*nN/6000m/s6.534512719Tk=PI*DK/K0.628318531-Imax=(UN-Ub)/Ra204.726272249Imax=(UN-Ub)/Ra753.887740076Imax=(Ea-Ub)/Ra753.000592737Imax=(UN+Ea-Ub)/Ra75289.821883-Pcua=IN2*Ra7519

13、.68521519pb=IN*Ub1.45PFe=k*p10/50(f/50)1.3*(mt2*Bt22+mj2*Bj22)7.576328614k=2-33p10/50, 查铁损手则W/kg6.3f=p*nN/60Hz50mt2=7.84*Kfe*La*(PI/4*(Da2-(Da-2*ht2)2)-Q*As)*10-3kg0.183254477mj2=7.84*Kfe*La*PI/4*(Da-2*ht2)2-Dt22)*10-3kg0.16054563pKbm=2*pb*Ab*pS*VkW3.324760072Ps=2-6N/cm2(或=200-600g/cm2)N/cm3.2, =0.2-0.30.25pBf+pWf0.04PNW3ptW=pKbm+pBf+pWfW6.324760072P=Pcua+Pb+Pfe+PtWW35.03630388P1=PN+PW110.04=PN/P1*100%68.1593232IN=P1/UNA0.478418713Ea=UN-Ub-IN*Ra75V199.5042351n=60*Ea/p*Nrpm4398.241515Ist=(UN-Ub)/Ra20A4.726272249