Investigation of a Low-Speed High-torque-Density Direct-Drive External-Rotor PMSM for Belt Conveyor Application

Aiming at the shortcomings of complex mechanical transmission structure and low efficiency existing belt conveyor driven by asynchronous motor, this paper focuses on investigation a new type low-speed high-torque-density direct-drive permanent magnet synchronous motor (LHDPMSM) for driving conveyor. The proposed LHDPMSM utilizes external rotor to achieve goal fully direct drive First, topology advantages straight-shape external-rotor is introduced. Then selection rules pole-slot combination are studied. Furthermore, an improved subdomain model established based idea segmentation fast calculation no-load magnetic field LHDPMSM. Moreover, operating performance with load fluctuations was verified FEA. In addition, efficient cooling system Z-shape water channels hollow shaft designed, LPTN temperature calculation. Since has negative impact strength, strength other fragile components analyzed ensure safe operation motor. Finally, prototype manufactured tested validate design concept introduced in paper.