The field (stator) winding and armature (rotor) winding are series-connected.
Contains in general compensation and commutation poles.
The parameter values l_q and r_q have to be interpreted differently for machines without and with
compensation and commutation poles.
- without:
r_q = r_aq resistance armature l_q = l_aq inductance armature
- with:
r_q = r_aq + r_fq resistance armature plus compensation poles
l_q = (l_aq - l_mq) + (l_fq - l_mq) stray inductance of armature plus
stray inductance of compensation poles
For pu input refer to the nominal (electrical) angular machine velocity pp*w_nom and use
L_base = R_base/(pp*w_nom)
Determination of the mutual inductance L_md.
L_md depends on the winding ratio between armature and field winding
L_md = (L_fd - Lsig_fd)*(n_a/n_f)
It can be determined in several ways,
- using the above formula
- using a constant K_E (back EMF)
- solving the steady-state machine equations for L_md at nominal conditions. This method leads to
L_md=(V_nom/I_nom - (R_fd + R_q))/(pp*w_nom)