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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.