An approach to locate the rotor position based on carrier frequency component is proposed aiming at the problems of reverse phase and poor accuracy at low speed of rotor position in traditional PMSM sensorless control. Based on analyzing the theory of carrier frequency component method, using the inherent current signal which contains the carrier frequency component of the inverter, it establishes a new coordinate system, then processes the current signal by the band-pass filter to obtain the carrier frequency component current, and estimates the rotor position by using the peak of filtered current. The simulation with MATLAB/Simulink and the experiment based on DSP hardware platform are used to verify the method. The experimental data shows that the rotor calculation error of the carrier frequency component method is within reasonable limits, and the proposed method also estimates the rotor position at start-up and low-speed stage excellently, so it is accurate.