Motorola M68HC08 manual Set constcustx.h, From Evaluation Board

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

User Guide

#define CURR_PIREG_I_GAINSCALELEFT 0

Range: <0,8>

/* MUST_CHANGE_5_EXPER: */ #define CURR_PIREG_I_GAIN 64

Range: <0,255>

where the current regulator integral gain is:

KP = CUR_PIREG_I_GAIN*2CURR_PIREG_I_GAINSCALELEFT (EQ 6-5.)

These constants can be calculated according to regulators theory. The current sampling (regulator execution) period is PER_CS_T1_US = 128 ∝s, at the default software setting. Normally it does not need to be changed (if change is required see PWM Frequency and Current Sampling Period Setting). Another recommended solution is an experimental setting.

NOTE: CURR_PIREG_P_GAINSCALELEFT, CURR_PIREG_P_GAIN, CURR_PIREG_I_GAINSCALELEFT, CURR_PIREG_I_GAIN can be evaluated with PC master software tuning file tuning_bldc.pmp.

We suggest using PC master software with tuning file tuning_bldc.pmp for regulator parameters evaluation. You can use this procedure:

1.	Set const_cust_x.h:
	CURR_PIREG_P_GAINSCALELEFT 0
	CURR_PIREG_P_GAIN 0
	CURR_PIREG_I_GAINSCALELEFT 0
	CURR_PIREG_I_GAIN 0
2.	Temporarily change the software: in code_start.c file, label
	TUNING_1 enable goto Align (it will cause infinite time for
	alignment state, where the current is tuned)
3.	Build and run the code (see Software Execution, Build, Execute
	from Evaluation Board)
4.	Start the PC master software tuning project
5.	Select Current Parameters Tuning subproject (see Software
	Parameters Tuning with PC Master Software Project File) in
	order to be able to modify the current regulator
6.	You can see the actual current (and required alignment current)
Designer Reference Manual		DRM028 — Rev 0
140	User Guide	MOTOROLA
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