This research delves into a sensorless control method for effective rotor position estimation in Permanent Magnet Synchronous Motors (PMSM) by injecting high-frequency pulsating signals. By injecting high-frequency voltage signals into the estimated rotor coordinate reference system and appropriately processing the high-frequency current response on the stator side, the estimated rotor position and speed information are obtained. Simulation results demonstrate the effectiveness of this method in achieving sensorless control of PMSMs at low speeds. However, challenges in the multi-stage filtering of high-frequency response signals were identified during experimental replication, emphasizing the need for further research into optimization strategies. The proposed method shows promise in extending the application of PMSMs in high-end industrial scenarios by providing accurate and stable control performance even at zero to low speeds.