## Dt dt

Furthermore, the stator flux-oriented control strategy (Tapia et al., 2006) is adopted in this work, which makes the stator flux y/s line in accordance with d-axis, as depicted in Fig.3., i.e.

Then the stator voltage equations can be rewritten as

Where Ut is the terminal voltage;

From Fig. 3, the vector of stator voltage Us=Ut is always align with q axis with the stator flux-oriented control strategy. And according to the stator flux linkage equations (6) and (7), the stator currents Ids and Iqs can be represented as the function of rotor current and terminal voltage Ut, i.e.

Iqs XmIqr (20)

Substituting equations (8) and (9) in equations (4) and (5), we find

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