3-5-1 Torque on the Rotor d-Axis Winding
On the rotor d-axis winding, the torque produced is due to the flux
density produced by the q-axis windings in Fig. 3-8. The peak of the
flux density distribution “cutting” the rotor d winding due to isq and irq,
each flowing through 3 2/ Ns turns of the q-axis windings (using
Eq. 2-3), is: