Sensorless Saliency-based Control of Dual Induction Machines under Dynamic Load Imbalances using Three Current Sensors

To perform vector control of single-inverter dual induction motors, drives are standardly equipped with current and position sensors. In medium-power railway applications, a shaft encoder is usually mounted on each motor, the inverter output measured using two Yet, this configuration features some disadvantages. First, torque-sharing cannot be computed because stator motor unknown. Similarly, saliency extraction not achievable since individual drawn by measured. An option that achieves calculation to attach sensors provided both rotor positions known. However, industrial inverter/control platforms considered offer maximum three input channels for Besides, industry fields tend towards encoderless speed control. Therefore, paper proposes use in total no encoders. Thanks special sensor arrangement voltage step excitation method, saliency-based achieved. addition, method presented estimate torque-sharing. Experimental measurements, taken test bench, will show capability proposed methodology identify loading as well excellent performance.