[Objective] To enhance the dynamic response performance and stability of interior permanent magnet synchronous motor (IPMSM) under flux-weakening conditions, and to address issues of current trajectory deviation and voltage saturation in traditional flux-weakening control strategies during high-speed operation, an improved flux-weakening control strategy for IPMSM is proposed. [Methods] Firstly, based on the mathematical model of IPMSM, the current trajectory of the traditional negative d-axis current compensation strategy was analyzed. It was observed that the current vector rotation transformation caused variations in output torque. Therefore, an improved flux-weakening control strategy was proposed, incorporating q-axis current compensation to offset torque fluctuations, thereby optimizing current trajectories and improving torque output stability. Secondly, for sudden load change conditions, the mechanism of voltage saturation was analyzed, and an anti-voltage saturation strategy prioritizing d-axis voltage supply was proposed. By dynamically adjusting the voltage distribution priority to ensure sufficient d-axis voltage supply, this strategy avoided current loss of control caused by voltage saturation, further enhancing system stability and reliability. [Results] To verify the effectiveness of the proposed strategy, an IPMSM experimental platform was established for comparative testing. The experimental results showed that, after the implementation of the improved flux-weakening control strategy, the current trajectory in the flux-weakening region of the IPMSM was significantly improved, the torque output stability was enhanced, and the system's dynamic response performance was improved. The anti-voltage saturation strategy effectively prevented current loss of control caused by voltage saturation, ensuring stable system operation. [Conclusion] The improved flux-weakening control strategy proposed in this study, by incorporating q-axis current compensation and prioritizing d-axis voltage supply, effectively addresses the issues of current trajectory deviation and voltage saturation in traditional flux-weakening control strategies during high-speed operation. Experimental results demonstrate that the proposed method can significantly enhance the current trajectory characteristics of IPMSM under flux-weakening conditions, improve the dynamic response performance of the system, and strengthen the anti-interference capability of the system, providing reliable technical support for the application of IPMSM in fields such as electric vehicles and high-speed machine tools.