Permanent magnet synchronous motors are widely used in the industrial field, and the power conversion part of the motor usually adopts power electronic devices to form an inverter with SVPWM modulation technique. In order to prevent the same-phase inverter bridge from short-circuiting, it is necessary to add dead time to the pulse signal. The introduction of dead time leads to the nonlinear distortion of the inverter, the harmonic content of its output current is increased, and the dynamic stability of the system cannot be guaranteed. In order to eliminate the dead time effect on the motor, in this paper, the rotor magnetic chain of the motor is taken as the state quantity, the magnetic chain constant is taken as the given, the calculated magnetic chain value is taken as the feedback, and the dead time is compensated by the PI regulator. Finally, the proposed method is verified in simulation software, and the comparison of simulation results confirms the reliability and effectiveness of the proposed adaptive deadband compensation method.