Study on Designing and Manufacturing Coaxial Brussless DC Motor

In this paper, the design of a coaxial machine is proposed which is a debut for further applying on contra-rotating propulsion system such as underwater vehicle, torpedo or even aerial vehicle. The coaxial machine comprises of two independent rotors to eliminate the differential mechanism, reduce the power consumption, the balance the react force and make the system more stable. A model-based controller is adopted to drive the coaxial machine to generate the thrust force and balance the react force while hovers the coaxial machine chassis. The effectiveness and reliability of coaxial motor are evaluated through simulation and experimental results.