Abstract: In order to solve the problem that current feedback control depends on motor parameters in the synchronous reference frame, a method of using current loop output to estimate inductance was proposed. However, in the case of low switching frequency, the delay caused by digital control can be equivalent to angle delay and time delay in synchronous reference frame. Angle delay affects output of the current loop, resulting in the errors of inductance identification. By drawing pole-zero map of the system, it can be found that time delay affects decoupling performance of the current loop. In order to eliminate the adverse effect of digital delay, a leading phase angle was introduced to eliminate the influence of the angle delay on inductance identification, and a predictive current feedback control was proposed to eliminate the time delay. Through above methods, the controller realized decoupling of torque component and flux. Finally, the feasibility and effectiveness of proposed method were verified by simulations and experiments.