PUBLICATIONS

This paper proposes a current reconstruction method using a single shunt resistor to reduce the number of phase current sensors in a mono inverter dual parallel (MIDP) permanent magnet synchronous motors (PMSMs) drive system. Con-ventional MIDP PMSM drive system requires four phase current sensors, which account for a considerable portion of the overall system cost. Since the MIDP structure is typically adopted in cost-sensitive applications, reducing the number of sensors is particularly important. The proposed method achieves this by reconstructing the phase currents using the dc-link shunt together with two phase current sensors. In this configuration, the dc-link current represents the sum of the phase currents of both PMSMs, making it difficult to distinguish the individual currents of the two motors. To overcome  this challenge, this paper proposes an algorithm that employs two phase current sensors placed in different phases, enabling accurate reconstruction of the three-phase currents for both motors. A compensation technique is incorporated to enable current reconstruction in all immeasurable regions, achieving reconstruction errors of approximately 3.07% and 2.08%. By reducing the number of sensors, the proposed method enhances the cost-efficiency and compactness of the MIDP PMSM drive  system. The  effectiveness  and  reliability  of  the  proposed  method  are  verified  through  both  PSIM  simulation  and hardware-in-the-loop (HIL) experimental results