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7546A–AVR–12/05

Application Note

Figure 4-6.

Sector determination

The resulting dataflow diagram, shown on Fig. 8, can be used to build a speed control loop (Fig- ure 4-8.), in which the difference between the desired speed and the measured speed feeds a PI controller that determines the stator voltage frequency. To decrease the complexity of the con- troller, the input of the V/f law and of the space vector PWM algorithm is the absolute value of the stator voltage frequency. If the output of the PI controller is a negative number, two of the switching variables driving the power transistors of the inverter are interchanged.

Figure 4-7.

Space Vector PWM data flow diagram

7

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