TI中文支持网大家好：
最近在做交流电机控制的时候，发现svgen.h里判断扇区，及对Ta，Tb，Tc的赋值部分不太懂，希望懂的朋友们能帮忙分析下：之前看过28335中的相关部分程序，感觉逻辑思路很容易就看懂了，下面分别发下两个程序：
svgen.h，这个不太看得懂；
#define SVGENDQ_MACRO(v) \
v.tmp1= v.Ubeta; \
v.tmp2= _IQdiv2(v.Ubeta) + (_IQmpy(_IQ(0.8660254),v.Ualpha)); \
v.tmp3= v.tmp2 – v.tmp1; \
\
v.VecSector=3; \
v.VecSector=(v.tmp2> 0)?( v.VecSector-1):v.VecSector; \
v.VecSector=(v.tmp3> 0)?( v.VecSector-1):v.VecSector; \
v.VecSector=(v.tmp1< 0)?(7-v.VecSector) :v.VecSector; \
\
if (v.VecSector==1 || v.VecSector==4) \
{ v.Ta= v.tmp2; \
v.Tb= v.tmp1-v.tmp3; \
v.Tc=-v.tmp2; \
} \
\
else if(v.VecSector==2 || v.VecSector==5) \
{ v.Ta= v.tmp3+v.tmp2; \
v.Tb= v.tmp1; \
v.Tc=-v.tmp1; \
} \
\
else \
{ v.Ta= v.tmp3; \
v.Tb=-v.tmp3; \
v.Tc=-(v.tmp1+v.tmp2); \
} \
\
#endif // __SVGEN_H__
svgendq.h
void svgendq_calc(SVGENDQ *v)
{
float Va,Vb,Vc,t1,t2;
unsigned int Sector = 0; // Inverse clarke transformation clark反变换将Ualpha.Ubeta->Ua Ub Uc
Va = v->Ubeta;
Vb = -0.5 * v->Ubeta + 0.8660254 * v->Ualpha; // 0.8660254 = sqrt(3)/2
Vc = -0.5 * v->Ubeta – 0.8660254 * v->Ualpha; // 0.8660254 = sqrt(3)/2
// 60 degree Sector determination
// (1)确定合成矢量 所在扇区。参考基于TMS320F28335的五段式和七段式SVPWM实现方法_郭寅远
if (Va>0)
Sector = 1; if (Vb>0)
Sector = Sector + 2;
if (Vc>0)
Sector = Sector + 4;
// X,Y,Z (Va,Vb,Vc) calculations
Va = v->Ubeta; // X = Va Vb = 0.5 * v->Ubeta + 0.8660254 * v->Ualpha; // Y = Vb Vc = 0.5 * v->Ubeta – 0.8660254 * v->Ualpha; // Z = Vc
if (Sector==0) // Sector 0: this is special case for (Ualpha,Ubeta) = (0,0)
{
v->Ta = 0.5;
v->Tb = 0.5;
v->Tc = 0.5;
}
else if (Sector==1) // Sector 1: t1=Z and t2=Y (abc —> Tb,Ta,Tc),U60,U120
{
t1 = Vc;
t2 = Vb;
if(t1+t2 > 1)
{
t1 = t1/(t1+t2);
t2 = 1-t1;
}
v->Tb = 0.5*(1-t1-t2); // tbon = (1-t1-t2)/2
v->Ta = v->Tb+t1; // taon = tbon+t1
v->Tc = v->Ta+t2; // tcon = taon+t2
}
else if (Sector==2) // Sector 2: t1=Y and t2=-X (abc —> Ta,Tc,Tb),U300,U0
{
t1 = Vb;
t2 = -Va;
if(t1+t2 > 1)
{
t1 = t1/(t1+t2);
t2 = 1-t1;
}
v->Ta = 0.5*(1-t1-t2); // taon = (1-t1-t2)/2
v->Tc = v->Ta+t1; // tcon = taon+t1
v->Tb = v->Tc+t2; // tbon = tcon+t2
}
else if (Sector==3) // Sector 3: t1=-Z and t2=X (abc —> Ta,Tb,Tc),U0,U60
{
t1 = -Vc;
t2 = Va;
if(t1+t2 > 1)
{
t1 = t1/(t1+t2);
t2 = 1-t1;
}
v->Ta = 0.5*(1-t1-t2); // taon = (1-t1-t2)/2
v->Tb = v->Ta+t1; // tbon = taon+t1
v->Tc = v->Tb+t2; // tcon = tbon+t2
}
else if (Sector==4) // Sector 4: t1=-X and t2=Z (abc —> Tc,Tb,Ta),U180,U240
{
t1 = -Va;
t2 = Vc;
if(t1+t2 > 1)
{
t1 = t1/(t1+t2);
t2 = 1-t1;
}
v->Tc = 0.5*(1-t1-t2); // tcon = (1-t1-t2)/2
v->Tb = v->Tc+t1; // tbon = tcon+t1
v->Ta = v->Tb+t2; // taon = tbon+t2
}
else if (Sector==5) // Sector 5: t1=X and t2=-Y (abc —> Tb,Tc,Ta),U120,U180
{
t1 = Va;
t2 = -Vb;
if(t1+t2 > 1)
{
t1 = t1/(t1+t2);
t2 = 1-t1;
}
v->Tb = 0.5*(1-t1-t2); // tbon = (1-t1-t2)/2
v->Tc = v->Tb+t1; // tcon = tbon+t1
v->Ta = v->Tc+t2; // taon = tcon+t2
// v->Tc = 0.5*(1-t1-t2); // tcon = (1-t1-t2)/2
// v->Ta = v->Tc+t1; // taon = tcon+t1
// v->Tb = v->Ta+t2; // tbon = taon+t2
}
else if (Sector==6) // Sector 6: t1=-Y and t2=-Z (abc —> Tc,Ta,Tb),U0,U60
{
t1 = -Vb;
t2 = -Vc;
if(t1+t2 > 1)
{
t1 = t1/(t1+t2);
t2 = 1-t1;
}
v->Tc = 0.5*(1-t1-t2); // tcon = (1-t1-t2)/2
v->Ta = v->Tc+t1; // taon = tcon+t1
v->Tb = v->Ta+t2; // tbon = taon+t2
// v->Tb = 0.5*(1-t1-t2); // tbon = (1-t1-t2)/2
// v->Tc = v->Tb+t1; // tcon = tbon+t1
// v->Ta = v->Tc+t2; // taon = tcon+t2
}
// Convert the unsigned format (ranged (0,1)) -> signed format (ranged (-1,1))
// v->Ta = 2 * (v->Ta – 0.5);
// v->Tb = 2 * (v->Tb – 0.5);
// v->Tc = 2 * (v->Tc – 0.5);
}
这个是一个一个判断然后赋值的就比较容易懂；
