832 Flux Weakening

The PM synchronous motor can be operated in the field-weakening mode, similar to the DC motor, to extend the constant power range and achieve higher speeds. An inj ection of negative id will weaken the air gap flux as seen from Equation 6.2. The implementation technique for the field-weakening mode is shown in Figure 8.20.

FIGURE 8.20 Vector controller structure for PMSM with field weakening.
FIGURE 8.21 Current controller block diagram.
FIGURE 8.22 Voltage controller block diagram.
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