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The Inverse clarke transformation in SVGEN_MACRO

SVGEN_MACRO is defined as

#define SVGEN_MACRO(v)                                                                                       \

...  

temp_sv1=_IQdiv2(v.Ubeta);      /*divide by 2*/                                                \  

temp_sv2=_IQmpy(_IQ(0.8660254),v.Ualpha); /* 0.8660254 = sqrt(3)/2*/      \

 /* Inverse clarke transformation */                                                                   \

 Va = v.Ubeta;                                                                                                   \

Vb = -temp_sv1 + temp_sv2;                                                                            \

Vc = -temp_sv1 - temp_sv2;                                                                             \

....

 

The first thing SVGEN_MACRO  do is to do  Inverse clarke transformation. But this transformation

confuse me. In my understanding, Inverse clarke transformation is

 

In other words, SVGEN_MACRO should define Inverse clarke transformat as

temp_sv1=_IQdiv2(v.Ualpha);      /*divide by 2*/                                                \  

temp_sv2=_IQmpy(_IQ(0.8660254),v.Ubeta); /* 0.8660254 = sqrt(3)/2*/      \

 

 Va = v.Ualpha;                                                                                                 \

Vb = -temp_sv1 + temp_sv2;                                                                            \

Vc = -temp_sv1 - temp_sv2;                                                                             \

Is there anything I misunderstand?