The model-based sensorless control method solves the noise and iron loss problem of harmonic signal injection sensorless control method by estimating back electromotive force or magnetic flux from the voltage equation of the permanent magnet synchronous motor. However, the model-based sensorless control method is difficult to estimate the back electromotive force and magnetic flux in the low speed operation region of the permanent magnet synchronous motor, and thus is limited to the low speed operation region. Therefore, in this paper, we propose a method to improve the sensorless control performance in the low speed operation region where it is difficult to estimate the back electromotive force by applying the model-based sensorless control method to the surface-mounted permanent magnet synchronous motor.