好难

相对运动，换位思考，定生动，繁化简，形不变而神变。

频繁开合有气动，大力开合有液压，精度高地电机站，为人服务百年传。

本例中采用了自耦变压器降压启动，变频调速，反接制动的方式对交流电机的上述过程进行分析和仿真。

源码：

parameter Real K=0.8"starting rate";

parameter Real a=0.544"frequency rate";

parameter Real b=0.0683"stable frequency rate";

parameter Real c=0.3893"another frequency rate";

parameter Real P=0.7"stoping rate"; 

Tl = 15;

if time <= 10 then

u_A = 0;

u_B = 0;

u_C = 0;

f_s = 0;

Rs = 0.531;

elseif time<=1590 then

f_s = f_N*a;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*a;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*a;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*a;

elseif time<=1640 then

f_s = f_N*a;

Rs = 5;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*a;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*a;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*a;

elseif time<=2550 then

f_s = f_N*a;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*a;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*a;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*a;

elseif time<=3050 then

f_s = f_N*b;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*b;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*b;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*b;

elseif time<=3150 then

f_s = f_N*K*c;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*K*c;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*K*c;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*K*c;

elseif time<=4400 then

f_s = f_N*c;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*c;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*c;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*c;

elseif time<=4450 then

f_s = f_N*P*a;

Rs = 4;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*a*P;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*a*P;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*a*P;

elseif time<=5400 then

f_s = f_N*a;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*a;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*a;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*a;

else

f_s = f_N*b;

Rs = 0.531;

u_A = u_N * 1.414 * sin(2*Pi*f_s*time/1000)*b;

u_B = u_N * 1.414 * sin(2*Pi*f_s*time/1000-2*Pi/3)*b;

u_C = u_N * 1.414 * sin(2*Pi*f_s*time/1000-4*Pi/3)*b;

end if;

end SACIM;

    耗时5400ms，过渡较平滑，转矩稳定在200Nm内，电流也控制地比较稳定，但转矩变化时的波动剧烈不规律。总结了一些但感觉书上一些方法没有具体算式无法实验。就剩电阻和调频两大流派，各占半边天。