The model is valid for permanent magnet (`excite=2`)
machines.

For rectangular voltage without additional PWM the only degree
of freedom is the voltage phase. It is chosen such that the d-axis
current (magnetising current) is zero `i_s[1] = 0`.

Under theese assumptions the torque-speed characteristic is
different from that of a DC-machine. In order to obtain a 'true'
DC-characteristic with linear dependence of torque and i_s[2] from
w_el, a second degree of freedom is needed.

v_sd = -w_el*c.L_s[2]*i_s[2]/((4/pi)*sin(width*pi/2)*par.V_nom); v_sq = 1; uPhasor[1] = sqrt(v_sd*v_sd + v_sq*v_sq); uPhasor[2] = atan2(v_sq, v_sd);

For reluctance (`excite=3`) machines psi_e is replaced by
a desired magnetising current in d-axis `i_sd`.

uPhasor[2] = atan2(c.R_s*i_s[2] + w_el*c.L_s[1]*i_sd, c.R_s*i_sd - w_el*c.L_s[2]*i_s[2]);Using a pu-current

uPhasor[2] = atan2(c.R_s*i_s[2] + w_el*c.L_s[1]*i_sd, (par.V_nom/(c.omega_nom*c.L_s[1]))*i_sd_pu - w_el*c.L_s[2]*i_s[2]);

More information see Partials.Synchron3rdBase.

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