Minimization of Rotor Position Detection Error Due to Zero-Current-Clamping Effect in Pulsating Carrier-Signal Injection-Based Sensorless Drives

This paper presents a minimization technique of the position detection error resulting from the zero current clamping (ZCC) effect for pulsating high-frequency (HF) signal injection-based sensorless drives. An analytical model is derived to obtain an accurate map of the ZCC effect of the PWM inverter. This model is universally agreed upon and subsequently incorporated into the development of a specialized offline commissioning test to identify the detailed model parameters. The proposed algorithm combines an offline commissioning approach and an online feedforward compensation in the stationary reference frame to achieve the minimal position error. Experiments illustrate the effectiveness of the proposed method in suppressing the position error caused by the ZCC disturbance.