ABSTRACT
Time derivative of flux linkage yields a voltage equation. The voltage equations can be described either in the stationary or synchronous frames. The stator flux is generated by stator and rotor currents. This chapter considers the stator flux contributed by the stator current. The stator flux is also affected by the rotor current. For simplicity in handling the field-oriented control that appears later, it is better to select stator current and rotor flux as the state variables, instead of stator and rotor currents. Induction Motor (IM) dynamics are derived utilizing the complex vector notation. When the alternating current (AC) motor dynamics are described in a synchronous reference frame, they resemble the direct current (DC) motor dynamics under certain conditions. Therefore, in the synchronous frame, the dq-axes currents can be interpreted as the field and torque components.
