Collaboration diagram for Vector Clarke Transform:

Functions
static void	tpt_clarke_f32 (f32_t pIalpha, f32_t pIbeta, f32_t Ia, f32_t Ib)
	Floating-point Clarke transform. More...

static void	tpt_clarke_q31 (q31_t pIalpha, q31_t pIbeta, q31_t Ia, q31_t Ib)
	Clarke transform for Q31 version. More...

Detailed Description

Forward Clarke transform converts the instantaneous stator phases into a two-coordinate time invariant vector. Generally the Clarke transform uses three-phase currents Ia, Ib and Ic to calculate currents in the two-phase orthogonal stator axis Ialpha and Ibeta. When Ialpha is superposed with Ia as shown in the figure below

Stator current space vector and its components in (a,b). and Ia + Ib + Ic = 0, in this condition Ialpha and Ibeta can be calculated using only Ia and Ib.

The function operates on a single sample of data and each call to the function returns the processed output. The library provides separate functions for Q31 and floating-point data types.

Algorithm: where Ia and Ib are the instantaneous stator phases and pIalpha and pIbeta are the two coordinates of time invariant vector.

Fixed-Point Behavior: Care must be taken when using the Q31 version of the Clarke transform. In particular, the overflow and saturation behavior of the accumulator used must be considered. Refer to the function specific documentation below for usage guidelines.

Function Documentation

◆ tpt_clarke_f32()

static void tpt_clarke_f32	(	f32_t *	pIalpha,
		f32_t *	pIbeta,
		f32_t	Ia,
		f32_t	Ib
	)

inlinestatic

Floating-point Clarke transform.

Parameters

[out]	pIalpha	points to output two-phase orthogonal vector axis alpha.
[out]	pIbeta	points to output two-phase orthogonal vector axis beta.
[in]	Ia	input three-phase coordinate `a`
[in]	Ib	input three-phase coordinate `b`

Returns: none

◆ tpt_clarke_q31()

static void tpt_clarke_q31	(	q31_t *	pIalpha,
		q31_t *	pIbeta,
		q31_t	Ia,
		q31_t	Ib
	)