?? ipark.c
字號:
/*=====================================================================================
File name: IPARK.C
Originator: Digital Control Systems Group
Texas Instruments
Description: Inverse Park Transformation
=====================================================================================
History:
-------------------------------------------------------------------------------------
04-15-2005 Version 3.20
-------------------------------------------------------------------------------------*/
#include "dmctype.h"
#include "ipark.h"
extern float32 sin_tab[];
void ipark_calc(IPARK *v)
{
float32 Cosine,Sine;
// Using look-up sine table
// (PI/2)/(2*PI) = 0.25
// ((PI/2)/(2*PI))*256 = 0.25*256 = 64
// ((PI/2)-2*PI)/(2*PI) = -0.75
// (((PI/2)-2*PI)/(2*PI))*256 = -0.75*256 = -192
if (v->Angle+0.25 > 1.0)
{
Sine = sin_tab[(int16)(v->Angle*256)];
Cosine = sin_tab[(int16)(v->Angle*256) - 192];
}
else
{
Sine = sin_tab[(int16)(v->Angle*256)];
Cosine = sin_tab[(int16)(v->Angle*256) + 64];
}
v->Alpha = v->Ds*Cosine - v->Qs*Sine;
v->Beta = v->Qs*Cosine + v->Ds*Sine;
}
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