Voltage Angle-Based Torque Control of Dual Three-Phase Interior Permanent Magnet Synchronous Motor Considering Mismatch in Winding Parameters

Voltage angle-based torque control of dual three-phase interior permanent magnet synchronous machines (DTP-IPMSMs) in the field weakening (FW) region offers maximum dc voltage utilization, increased speed range, and higher torque capability. However, the difference in parameter values between the two three-phase winding sets results in torque limitations during FW operation. This article considers a dual three-phase IPMSM with 0
$^\circ$
winding displacement (DTP0 IPMSM), where the resistance and leakage inductance of each three-phase winding set are not the same. The effect of this parameter mismatch on the FW performance is discussed in detail. Further, a control scheme is proposed, where a 2-pole torque controller controls the torque dynamics by modifying the voltage angle of one of the inverters, while the other inverter's voltage angle is controlled to minimize the effect of parameter mismatch. The proposed method is implemented on a 3.68 kW DTP0 IPMSM prototype. For a given torque, the current requirement is shown to reduce approximately by 4% in the low and midspeed ranges of the FW region when compared with existing approaches of DTP0 IPMSM control. The performance of the 2-pole controller is also demonstrated, which achieves the desired control system specifications.