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 This paper proposes a gain design strategy for an active damping controller in a mono-inverter dual parallel (MIDP) permanent magnet synchronous motors (PMSMs) drive system. Dual motors are connected in parallel with a single inverter. One motor is chosen as a master motor which is the main controlled motor and the other motor is chosen as a slave motor which is controlled simultaneously with a master motor. Since a single inverter controls two motors in a MIDP system, torque oscillation occurs in the slave motor. Therefore, an active damping controller that regulates torque oscillations is required. This paper provides a design strategy for a gain of an active damping controller. The performance of the proposed design strategy for a MIDP PMSMs drive system is verified by simulation results with two 500-W PMSMs.