Design and Analysis of a Novel Modular-Stator Tubular Permanent-Magnet Vernier Motor

This paper proposes a new modular-stator tubular permanent-magnet (PM) Vernier motor. The proposed motor offers a good fault-tolerant capability and an improved force performance, suitable for the electromagnetic active vehicle suspension. The proposed motor artfully integrates PM Vernier motors and tubular motors together, offering a zero-net radial force between the armature and mover, and the robust mover structure and high thrust force. Meanwhile, the modular complementary stator structure is designed to decouple the adjacent phase windings, hence offering the desired fault-tolerant capability. Moreover, the PMs with two magnetized directions are adopted, namely radially and axially. One is used to produce the main flux, while another can reduce fringing leakage flux, hence increasing the thrust force. The electromagnetic performances are analyzed by using the finite-element method, verifying the effectiveness of the theoretical analysis.