Principle and Analysis of Structure of Low-Speed High-Torque Gear Meshing Motor Driven by Radial Force

This paper proposes a new motor structure based on the electromagnetic radial force drive. The radial electromagnetic force is converted into output torque through the meshing action of the gear pair, thereby significantly improving the torque density. In this study, the magnetic circuit characteristics and air gap flux density distribution are analyzed and verified through finite-element method. The analysis results of the radial force on the internal gear as a function of time are given. Then the gear pair model was designed, and its feasibility was verified. Evaluating the performance of the motor, it can reach a torque density of 13 Nm/L in a small volume of 0.16 L. The proposed motor structure has significant advantages in space-constrained low-speed and high-torque applications.