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E. Montero, M Vogelsberger, G. Newesely, T. Wolbank:
"Identification of Torque-Sharing in Dual Induction Motors using Smart Current Sensor Configuration´";
accepted for publication in ZEV Rail 11/12 (2021), 145.

Group drives (e.g., two parallel feed motors) are a usual practice in the field of traction industry, such as railway applications, as it requires fewer power electronic components compared to the alternative, where each motor is individually supplied by an inverter. Available literature shows that knowledge on the torque-sharing can lead to improved stability by inputting such condition into the control scheme and modifying flux command to tackle load imbalances. Attaching two current sensors and an encoder to each motor enables easy FOC torque-sharing calculation. However, as will be shown, more efficient sensor arrangements can be used. This paper uses a reduced amount of current sensors, where only three current sensors in total are used (two attached to the first motor, one to the second). Using advanced signal processing, average field-oriented control of both motors is achieved, with knowledge on individual flux and torque.

https://www.zevrail.de/artikel/identifikation-der-lastaufteilung-von-dualen-induktionsmotoren-mittels-intelligenter