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本帖最后由 breeze_one 于 2012-5-5 15:53 编辑
TI的这个controlSUITE套件中的C:\TI\controlSUITE\development_kits\HVMotorCtrl+PfcKit_v1.6\HVACI_Scalar这个交流异步电机的spwm控制，关于这个步进角度StepAngle怎么算的，有人知道嘛？v.Freq假设是IQ24(0.3)，v.FreqMax是IQ24(1.0)，一下函数是PWM中断时调用；pwm频率为10k；
StepAngle = _IQmpy(v.Freq,v.FreqMax); \
/* Calculate new angle alpha */ \
EntryOld = v.NewEntry; （这两个值的初始值都为0） \
v.Alpha = v.Alpha + StepAngle; \
if (v.Alpha >= _IQ(1.0)) \
v.Alpha = v.Alpha-_IQ(1.0); \
v.NewEntry = v.Alpha; \
dy = _IQsin(_IQmpy(v.NewEntry,PI_THIRD)); /* dy = sin(NewEntry) PI_THIRD = 3.1415926/3 */ \
dx = _IQsin(PI_THIRD-_IQmpy(v.NewEntry,PI_THIRD)); /* dx = sin(60-NewEntry) */ \
/* Determine which sector */ \
if (v.NewEntry-EntryOld<0) \
{ \
if (v.SectorPointer==5) \
v.SectorPointer = 0; \
else \
v.SectorPointer = v.SectorPointer + 1; \
} \
if (v.SectorPointer==0) /* Sector 1 calculations - a,b,c -. a,b,c*/ \
{ \
v.Ta = (TP-dx-dy)>>1; \
v.Tb = v.Ta + dx; \
v.Tc = TP - v.Ta; \
} \
else if (v.SectorPointer==1) /* Sector 2 calculations - a,b,c -. b,a,c & dx <-. dy */ \
{ \
v.Tb = (TP-dx-dy)>>1; \
v.Ta = v.Tb + dy; \
v.Tc = TP - v.Tb; \
} \
else if (v.SectorPointer==2) /* Sector 3 calculations - a,b,c -. b,c,a */ \
{ \
v.Tb = (TP-dx-dy)>>1; \
v.Tc = v.Tb + dx; \
v.Ta = TP - v.Tb; \
} \
else if (v.SectorPointer==3) /* Sector 4 calculations - a,b,c -. c,b,a & dx <-. dy */ \
{ \
v.Tc = (TP-dx-dy)>>1; \
v.Tb = v.Tc + dy; \
v.Ta = TP - v.Tc; \
} \
else if (v.SectorPointer==4) /* Sector 5 calculations - a,b,c -. c,a,b */ \
{ \
v.Tc = (TP-dx-dy)>>1; \
v.Ta = v.Tc + dx; \
v.Tb = TP - v.Tc; \
} \
else if (v.SectorPointer==5) /* Sector 6 calculations - a,b,c -. a,c,b & dx <-. dy */ \
{ \
v.Ta = (TP-dx-dy)>>1; \
v.Tc = v.Ta + dy; \
v.Tb = TP - v.Ta; \
} \
/* Convert the unsigned GLOBAL_Q format (ranged (0,1)) . signed GLOBAL_Q format (ranged (-1,1)) */ \
/* Then, multiply with a gain and add an offset. */ \
v.Ta = (v.Ta-_IQ(0.5))<<1; \
v.Ta = _IQmpy(v.Gain,v.Ta) + v.Offset; v.Gain是对应的最高电压U \
\
v.Tb = (v.Tb-_IQ(0.5))<<1; \
v.Tb = _IQmpy(v.Gain,v.Tb) + v.Offset; \
\
v.Tc = (v.Tc-_IQ(0.5))<<1; \
v.Tc = _IQmpy(v.Gain,v.Tc) + v.Offset; |
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发表于 2012-5-5 15:52:25
楼主