Aiming at the problem that the direct torque control of permanent magnet synchronous motor（ PMSM） has larger pulsation on torque and flux

this paper introduces the theory of feedback linearization

combining with the space vector pulse width modulation（ SVPWM） technology

an improved method is proposed which will enable the original system to realize input-output linearization control. The analysis of conditions of the control system to realize feedback linearization is conducted and the control model of the system is given at the very beginning. The paper uses the five-stage SVPWM control algorithm. This control method and the traditional direct torque control system are contrasted under the simulation. The results show that the design based on feedback linearization of permanent magnet synchronous motor direct torque control system obviously restrains the pulsation on torque and flux

and it has ideal dynamic and static performance.