In the last few decades, Interior Permanent Magnet Synchronous Motors (IPMSM) have garnered wide acceptance as EV propulsion systems owing to their high torque density, high power density, and high efficiency. Since reliability and fault tolerance are a major concern in EVs, multi-phase PMSMs have been gaining popularity. Among the different multi-phase configurations, Dual Three Phase (DTP) machines are most commonly used. In an ideal condition, a DTP machine consists of two identical 3-phase stator windings displaced spatially by a certain angle. However, in practice, there exist finite differences between the per-phase resistance and winding inductances between the two 3-phase winding sets.

In this work, the impact of these winding non-idealities has been investigated. A mathematical model of the non-ideal DTP IPMSM with 0-degree winding displacement is considered. The analysis of the model revealed that the presence of the parameter mismatches impacts the torque capability in the field weakening region, when conventional Voltage Angle Control (VAC) is employed. Hence, a modified Voltage Angle Controller is proposed, which allows control of torque dynamics and at the same time minimizes the impact of parameter mismatch.