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Application Note

Table 6-1.

List of Fil

es used in the “Project_Vector”.IAR project.

File main_space_vector_PWM.c space_vector_PWM2.c controlVF.c mc_control.c read_acquisitionADC.c init.c psc_initialisation2.c adc.c dac.c

Description main upper level of the application sector and theta determination Compute a constant V/F ratio regulation loop (PI) return the ADC result CPU initialization (IO ports, timers) PSC initialization ADC functions DAC functions

6.2

Experimentation

Figure 6-1. shows the speed response and the stator voltages obtained with the microcontroller for speed reference steps between +700 and -700 rpm. These experimental results were obtained with a 750 W induction machine. This figure shows that the desired speed is reached after a 1.2 s long transient, and that when the stator frequency ωs obtained at the output of the PI regulator nears zero, the stator voltage magnitude is equal to the boost voltage. These figures also confirm that transient obtained with a a space vector PWM is smoother but also longer.

Figure 6-1.

Measured speed (in rpm) and line-to-neutral stator voltage (in Volts) obtained with the microcontroller during speed reference steps

(a)

speed [rpm]

500

0

−500

−1

  • 0

    1

2

3

4

5

6

7

8

(b)

stator voltage [V]

50

0

−50 −1

  • 0

    1

2

3

4

5

6

7

8

(c)

stator voltage [V]

50

0

−50

3

3.02

3.04

3.06

3.08

3.1 time [s]

3.12

3.14

3.16

3.18

3.2

7.

Resources

Code Size : 2 584 bytes RAM Size : 217 bytes

9

7546A–AVR–12/05

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