2026 Volume 15 Issue 2 Pages 323-331
Flying start refers to the resumption of motor current control by reapplying power to an inverter when the motor continues to rotate at a nonzero speed after a power interruption. This issue is particularly critical for permanent magnet synchronous motors operating under position-sensorless control, where large initial position estimiation errors can induce electromotive-force-driven inrush currents and trigger overcurrent protection. Previous studies have shown that existing flying-start algorithms often require extended settling times and mode switching to address this problem. In this paper, we propose a seamless flying start algorithm that operates entirely within position-sensorless field-oriented control, eliminating the need for mode switching and significantly reducing the settling time. The proposed method exploits the unique initial position estimate provided by a model-based position estimator formulated in the stationary reference frame under specific inverter voltage conditions. Experimental results validate the effectiveness of the proposed algorithm.
