Abstract
Nowadays, in aeronautical applications, rigorous reliability requirements are high constraints for embedded systems. Therefore, material redundancy is adopted to ensure safety whatever operation conditions may be. In the design of a direct-drive actuator for a specific application, redundancy is taken into account using a compound of four three-phase permanent magnet synchronous machines (PMSM). Each two electric machines are mounted in series sharing the same rotor with a common through shaft. The stators of each two electric machines are designed and manufactured as a six-phase machine. For each machine, power supply, sensors, and control loops are independent. In the characterization of the designed actuator and in the validation of its specific control in healthy operation mode and in faulty operation mode, taking into account the force fight phenomenon between the motor lanes, a specific test bench is developed. The aim of this paper is to highlight this phenomenon in faulty operation mode and to develop an easily implementable monitoring architecture, in order to eliminate it. Finally, with the proposed approach of monitoring, the force fight phenomenon is eliminated in faulty operation mode keeping the same performance as in healthy operation mode.
Highlights
Nowadays industries require electrical rotating machines to be more and more efficient
In faulty operation mode, the monitoring block can detect any abnormal operation on the designed actuator from data sensors provided by the electronic control unit (ECU)
The design and the manufacturing of a prototype achieve the new concept of the direct-drive actuator with four Brushless Alternative Current (BLAC) motors
Summary
Nowadays industries require electrical rotating machines to be more and more efficient. The major problem of material redundancy resides in the force fight phenomenon between the active electric machines. The position control loops associated with each machine provide the requested motor torque This phenomenon creates abnormal operation of the direct drive actuator involving current consumption with thermal rise and possibly instability and/or decrease in performance. To eliminate this abnormal behavior, some faults are identified as responsible for this phenomenon and some monitoring approaches are suggested to create a communication protocol between information feedback and active lanes. An experimental validation is carried out on a specific test bench to show the force fight phenomenon between the lanes and how to eliminate it in order to keep the same performance as in healthy operation mode
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