Based on the design of a parallel motor control system driven by a single inverter it often requires removal of the speed sensor to reduce costs, minimize volumetric packaging, and increase system reliability. By combining the idea of averaging is created, which takes into account different parameters and unbalanced loads. The method proposed in this paper is to control a parallel induction motor using a single observer and a single inverter. Regardless of unbalanced load at start, unbalanced load when running or balanced load when running. The simulation results show that the given method can run smoothly and has good dynamics. © 2021 Author(s).