An adaptive backstepping control method of interior permanent magnet synchronous motors(IPMSM) with ??_?? = 0 is proposed. By defining the virtual control variables and selecting the proper Lyapunov functions, the control law and parameter adaptation law are derived. The proposed method is able to regulate the control outputs dynamically, according to the stator resistance and load torque estimated by the adaptive parameter estimator in real time. So the accuracy of speed control and the ability of disturbance rejection are improved significantly. Simulation results show that the driving system can quickly track the speed reference and is robust against the parameter variations and load disturbances.