In order to solve the nonlinear control problem of SiC-MOSFET interior permanent magnet synchronous motor (IPMSM), a control system based on active disturbance rejection is designed. Iterative expressions between d-q axises current and torque are established via extremum principle, maximum ratio of torque to current control is implemented. At the same time, the active disturbance rejection control is introduced to adjust the speed. According to the principle of tracking-observation-compensation, the internal and external disturbances of the IPMSM were compensated. The comparison between the simulation and experimental results of different controllers proves that the system can effectively reduce overshoot, improve the system response speed, and has good anti-interference ability.