<p>In permanent magnet synchronous motor (PMSM) drive systems, chattering phenomena, disturbances, unspecified dynamics, and model uncertainties reduce the accuracy of control algorithms. This article introduces an H-infinity-based control method for PMSM drives, aiming to improve convergence speed, system stability, and resistance. Addressing accuracy challenges from load torque changes, it employs a sliding mode observer (SMO) for torque projection and feedback. In this way, control calculations are performed with higher accuracy, and the entire control system is resistant to load changes. To check the efficacy of the suggested tactic and its performance in PMSM motor control, a series of practical tests was conducted in two different scenarios, and the outcomes were compared to those of the typical sliding mode control (SMC). The outcomes of the tests show that the suggested method performed well and had no disturbance compared to the traditional SMC tactic. Also, higher convergence speed has been observed in the recommended tactic.</p>