ABSTRACT
As mentioned in Chapter 1, vector control means an independent (or decoupled) control of flux and torque of the motor (to be controlled) through a coordinated change in the supply voltage and frequency [l]-[3]. Flux level control is essential to avoid saturation and minimize core losses under various steady-state operating conditions. As the flux variation tends to be slow, especially with current control, constancy of flux may provide a fast torque response, resulting in a fast speed (or position) response.
