Characteristic Analysis of the Magnetic Variable Speed Diesel–Electric Hybrid Motor With Auxiliary Teeth for Ship Propulsion

To improve the reliability and continuous navigation of ship propulsion, a magnetic variable speed diesel–electric hybrid motor with auxiliary teeth for ship propulsion is proposed in this article. The inner rotor permanent magnet of the motor adopts an eccentric structure and is magnetized by the Halbach array. The auxiliary teeth are inserted into the stator, which not only has the function of magnetic regulation but also can realize phase-to-phase isolation. Moreover, it can increase the reliability of the motor. The working modes of the motor in the marine propulsion system mainly include diesel engine driving mode, electric propulsion mode, and hybrid propulsion mode. In this study, finite element software is employed to build the motor's parametric model. According to the results of comprehensive sensitivity analysis, the electromagnetic torque and torque ripple are optimized by combining evolutionary algorithm and response surface method. Finally, a prototype is manufactured and an experimental platform is built. The experimental results show that the motor exhibits excellent dynamic response performance, a small torque ripple, a good sinusoidal back electromotive force, and low loss.