<![CDATA[Unlocking the dynamic performance of electric vehicles is often limited by the voltage constraints of the battery system. This study proposes an optimized control strategy for Interior Permanent Magnet Synchronous Motors based on an analytical formulation of direct-axis current trajectories to maximize speed extension while maintaining torque smoothness under strict battery voltage constraints, utilizing parameters characteristic of commercial C-segment electric vehicles (e.g., VinFast VF e34). Through a comprehensive simulation framework, the research investigates a coordinated Field-Oriented Control scheme integrated with a Flux-Weakening strategy through direct-axis current adjustment to reconcile the conflict between high-speed operation (up to 6 times the base speed of 100 rad/s) and power quality. The analysis identifies a critical operating point at a direct-axis current of -25 A, which effectively prevents voltage saturation while maintaining torque smoothness. The results demonstrate that, when evaluated against the baseline Field-Oriented Control without flux-weakening at 600 rad/s, this specific trajectory significantly reduces torque ripple by 8.6 Nm and suppresses Total Harmonic Distortion to a negligible 0.19%. This combined mitigation contributes to the high-speed operating capability by preventing system oscillations and preserving linear voltage modulation at this upper speed limit. These findings provide a validated guideline for enhancing powertrain stability and mechanical lifespan in modern electric mobility.]]>
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