Hi, I have attached a diagram of a wye connected motor load with open neutral. The circuit shows an inverter state with a DC-bus voltage from terminal A to G (ground). The following equations should hold: V_AN = Z*Ia + Ea V_GN = Z*Ib + Eb V_GN = Z*Ic + Ec Ia + Ib + Ic = 0 Ea + Eb + Ec = 0 (back EMFs sum to zero) I want to prove that: Ea/Ia = Eb/Ib = Ec/Ic which would mean, according to: V_AN/Ia = Z + Ea/Ia V_GN/Ib = Z + Eb/Ib V_GN/Ic = Z + Ec/Ic that the impedance + back EMF in each phase can be replaced by the same effective impedance. I have verified this by simulation in LTspice. This is probably very simple, but it has been bothering me all day. Any help is greatly appreciated. Thanks!