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This paper proposes stable and efficient I/F control for dual parallel surface-mounted permanent magnet synchronous motor (SPMSM) drives fed by a single inverter. The frequency modulation method using power perturbation of active power is used to stabilize the speed oscillation of a motor. The power perturbation is obtained from the active power of the two motors through a high-pass filter. Using a full-order flux observer, the motor position is estimated, and the torque angle is controlled using estimated position, to minimize the current. Simulations are conducted to verify the presented method.