Equivalent circuit of the

induction machine (per unit)

f_s = (L_m + L_sl)I_s + L_m I_r

f_r = L_m I_s + (L_m + L_rl)I_r

V_s = R_s I_s + jw_s f_s

0 = R_r I_r + j(w_s-w_m) f_r

Te = k Im[f_s^* I_s] = k Im[I_r^* f_r] = k |I_r|² R_r / (w_s-w_m)

k = 1 (pu)

= 3 poles / 4 (SI)