<p>Aiming at the difficult problem that the rotor is not easy to dissipate heat under vacuum environment, this paper proposes an innovative multilayer pole permanent magnet motor structure, which aims to reduce the rotor eddy current loss. Aiming at the complex three-dimensional flux distribution of this motor structure, this paper then proposes a three-dimensional coupled electromagnetic field coplanar network model for the first time, which takes into account the congestion effect of the magnetic field axially passing through the claw-pole structure and dynamically couples the electromagnetic induction between the electrical network sub-model based on eddy current loss and the magnetic network sub-model. Meanwhile, the model equates and maps the three-dimensional electromagnetic field network model to a two-dimensional plane, forming a three-dimensional electromagnetic field coplanar network model, which greatly shortens the design and optimization cycle based on the accurate prediction of the electromagnetic performance and rotor eddy current loss of the multilayer pole permanent magnet motor. Finally, a prototype of the multilayer pole permanent magnet motor is developed, and a test platform is built to verify the effectiveness of the new motor topology design and the accuracy of the model calculation through the test results. The multilayer pole permanent magnet motor is proposed to provide a new solution to reduce the eddy current loss of the rotor of the drive motor under vacuum environment. The three-dimensional coupled electromagnetic field coplanar network model constructed at the same time provides universal theoretical tools and methodological support for the rapid optimization design of motors under high vacuum and strong thermal coupling conditions.</p>