AN2281 datasheet(23/38 Pages) STMICROELECTRONICS

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AN2281

Getting started with the ST7FLITE35-based PMAC motor control system

23/38

Two different sets of compiler and linker options (Debug and Release) can be handled by

the tool depending on the development stage.

6.4

How to set the library parameters to run a PMAC motor for

the first time

To run a 12V PMAC motor with the motor control system described in this document, you

first need do some configuration to the software library. In the PMAC_Param.h header file,

set the number of motor pole pairs in the command line

#define POLES_PAIRS_NUMBER

Then, you need to find out the optimum phase angle (an oscilloscope with a current probe

is necessary). To do this, you should:

●

Enable the tuning of phase angle via the Pot2 potentiometer and set the minimum and

maximum angle respectively at 0 and 360°:

#define MIN_PHASE

(u16)

//in 1/65535 unit

180° <=> 32768

#define MAX_PHASE

(u16)

65535

//in 1/65535 unit

180° <=> 32768

●

Select open loop driving mode using this define:

#define DRIVING_MODE

OPEN_LOOP

and setting the minimum and maximum voltages between 0% and 100%:

#define MAX_VOLTAGE 255

#define MIN_VOLTAGE

●

Disable V/F curve limitation

●

Disable the rotor alignment phase

●

Configure the start-up phase parameters, initially disabling the alignment phase and

fixing the ramp-up parameters as follows:

#define START_SPEED

400

//in rpm

#define START_UP_DURATION

500

// in msec

#define START_VOLT

// in 1/255 unit

#define FIN_VOLT

130

in 1/255 unit

●

Adjust potentiometer Pot1 to about 50%

After you have made these settings, you should compile the software library and program

the microcontroller.

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