Independent Control of Three-Phase PMSM and Single-Phase Motor Using a Single Voltage Source Three-Phase Inverter ad a Single DC-Link Current Sensor

This study proposes a control strategy and system configuration enabling the independent operation of a three-phase permanent magnet synchronous motor and a single-phase motor via a single–voltage-source three-phase inverter and a single DC-link current sensor. The propose topology enables the current measurement of both motors by using only one shunt resister. The conditions under which a dead zone arises during the current reconstruction process, along with its limitations, are analytically investigated. Voltage and current analyses demonstrate tat the two motors can operate independently without mutual interference. The experimental results confirm that both motors follow their respective command references independently under steady-state and transient-state conditions, and current reconstruction is impossible within the dead zone. The findings verify that independent operation of three-phase and single-phase motors can be achieved in dual-motor drive systems while reducing the number of inverters and current sensors needed.