<p>This paper introduces a modified field-oriented control (FOC) strategy for a three-level neutral point clamped (NPC) inverter driving a permanent magnet synchronous motor (PMSM). Conventional FOC implementations often rely on trigonometric functions within space vector pulse width modulation (SVPWM), leading to an increased computational burden and slower execution. To overcome this limitation, this paper proposes an imaginary coordinate-based SVPWM approach. This technique replaces complex trigonometric calculations with simpler arithmetic operations, enabling faster and more efficient real-time control. The proposed control scheme integrates maximum torque per ampere (MTPA) for optimal performance at low speeds and flux weakening (FW) to extend the operating speed range. This combination ensures a seamless transition between the two control modes and achieves optimal drive performance across a wide speed spectrum. The suggested method demonstrates improved torque control, reduced current harmonic distortion, and enhanced dynamic response while maintaining optimal inverter switching characteristics. Simulation and experimental validations across various torque-speed profiles confirm the effectiveness of the proposed technique. Furthermore, a comprehensive comparison with conventional FOC methods highlights significant improvements in computational efficiency, torque ripple reduction, and current total harmonic distortion (THD) minimization of the overall drive system.</p>