831 Vector Control

Vector control is used for the PM synchronous motor drive in EV and HEV applications to deliver required performance. Torque Equation 6.2 for the PM synchronous motor shows that if the d-axis current i s maintained constant, the generated torque

FIGURE 8.19 A typical PM synchronous motor drive structure.

=motor constant. Because the magnetic flux linkage is a constant, torque is directly proportional to q-axis current. The torque equation is similar to that of a separately excited DC machine. Therefore, using reference frame transformations, the PM synchronous motor can be controlled like a DC machine.

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