3.3.9 mcFoc_ParkTransformation

C

/* Floating point Park Transformation */
void mcFoc_ParkTransformation( const tmcTypes_AlphaBeta_s * const pAlphaBeta, const float32_t sine, const float32_t cosine,
                                                                                    tmcTypes_DQ_s * const pDQ )	


/* Fixed point Park Transformation */
void mcFoc_ParkTransformation(const tmcTypes_AlphaBeta_s * const pAlphaBeta,
                                                   const int16_t sine, const int16_t cosine,
                                                   tmcTypes_DQ_s * const pDQ)

Summary

Park Transformation.

Description

This function performs the Park transformation to convert stationary reference frame (alpha-beta) currents into rotating reference frame (D-Q) currents. When the d-axis is aligned with the rotor flux, the following mathematical equations illustrate the current vector and the relationship between the two reference frames.

$X_{d} = X_{α} \cos θ_{e} + X_{β} \sin θ_{e}$

$X_{q} = {- X}_{α} \sin θ_{e} + X_{β} c o s θ_{e}$

where $X_{α}$ and $X_{β}$ are the stationary reference frame components, $X_{d}$ and $X_{q}$ are rotating reference frame components and $\cos θ_{e}$ and $\sin θ_{e}$ are the cosine and sine values of theta (rotor flux position angle)

Precondition

None.

Parameters


Param	Description
pAlphaBeta	A pointer to the structure holding alpha-beta currents.
sine	Sine value of the electrical angle. Refer the generated header for the exact data type.
cosine	Cosine value of the electrical angle. Refer the generated header for the exact data type.
pDQ	A pointer to the structure holding DQ currents.

Returns

None. The results of the transformation are stored in the structure pointed to by pDQ.

Example

// Define the parameters for Floating point Park Transformation
tmcTypes_AlphaBeta_s alphaBetaCurrents = { .alpha = 1.0f, .beta = 0.5f };
float32_t sineValue = sin(electricalAngle);
float32_t cosineValue = cos(electricalAngle);
tmcTypes_DQ_s dqCurrents;


// Define the parameters for fixed point Park Transformation
tmcTypes_AlphaBeta_s alphaBetaCurrents = { .alpha = 10, .beta = -10 };
int16_t sineValue = sin(electricalAngle);
int16_t cosineValue = cos(electricalAngle);
tmcTypes_DQ_s dqCurrents;

mcFoc_ParkTransformation(&alphaBetaCurrents, sineValue, cosineValue, &dqCurrents);

Remarks

Refer the generated header file for the exact function signature.