UM0324 datasheet(19/105 Pages) STMICROELECTRONICS

19 / 105 page

UM0324

Getting started with the library

19/105

2.2.2

Drive control parameters: MC_Control_Param.h

The MC_Control_Param.h header file gathers parameters related to:

●

Power device control parameters on page 19

●

Flux and torque PID regulators sampling rate on page 19

●

Speed regulation loop frequency on page 19

●

Speed controller setpoint and PID constants (initial values) on page 20

●

Torque and flux controller setpoints and PID constants on page 20

●

Start-up torque ramp parameters on page 21

●

Linear variation of PID constants according to mechanical speed. on page 21

Power device control parameters

●

#define PWM_FREQ

Define here, in Hz, the switching frequency; in parallel, uncomment the maximum

allowed modulation index definition (MAX_MODULATION_XX_PER_CENT)

corresponding to the PWM frequency selection.

●

#define DEADTIME_NS

Define here, in ns, the dead time, in order to avoid shoot-through conditions.

Flux and torque PID regulators sampling rate

●

#define REP_RATE

Stator currents sampling frequency and consequently flux and torque PID regulators

sampling rate, are defined according to the following equation:

In fact, because there is no reason for either executing the IFOC algorithm without updating

the stator currents values or for performing stator current conversions without running the

IFOC algorithm, in the proposed implementation the stator current sampling frequency and

the IFOC algorithm execution rate coincide.

Note:

REP_RATE must be an odd number if currents are measured by shunt resistors (see

Section A.2: Selecting PWM frequency for 3 shunt resistor configuration on page 98 for

details); its value is 8-bit long;

Speed regulation loop frequency

#define PID_SPEED_SAMPLING_TIME

The speed regulation loop frequency is selected by assigning one of the defines below:

#define PID_SPEED_SAMPLING_500us

//min 500us

#define PID_SPEED_SAMPLING_1ms

#define PID_SPEED_SAMPLING_2ms

//(4-1)*500uS=2ms

#define PID_SPEED_SAMPLING_4.5ms

#define PID_SPEED_SAMPLING_10ms

#define PID_SPEED_SAMPLING_127ms

255 //max(255-1)*500us=127ms

⋅

RATE

REP

FREQ

PWM

rate

sampling

PIDs

torque

and

Flux

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