[Objective] Aiming at the issues of high permanent magnet cost

excessive air-gap magnetic field harmonics

and poor high-temperature demagnetization resistance in rare-earth permanent magnet motors for scraper conveyors

this paper proposes a hybrid-pole low-speed permanent magnet synchronous motor (PMSM) excited by both ferrite and NdFeB. The design leverages the advantages of ferrite magnets

such as low cost and strong high-temperature demagnetization resistance

to address these problems. [Methods] The electromagnetic design of the PMSM was first conducted to determine its fundamental parameters. To enhance permanent magnet material utilization

five distinct rotor structures were designed and comparatively analyzed under identical magnet usage conditions

from which the configuration with optimal torque output capability was selected. Subsequently

three hybrid-pole magnetic circuit designs were developed for comparative evaluation. Finally

finite element analysis software was employed to perform comprehensive assessments of the finalized design

including electromagnetic performance analysis

temperature field verification

and high-temperature demagnetization resistance evaluation

thereby validating the effectiveness of the hybrid-pole solution. [Results] Compared with traditional rare-earth permanent magnet motors

the hybrid-pole rotor structure reduced the permanent magnet cost by 15.5% while maintaining the rated torque

decreased the torque ripple by 16.7%

and significantly enhanced the high-temperature demagnetization resistance. [Conclusion] The hybrid-pole rotor structure demonstrates remarkable effectiveness in reducing permanent magnet costs

optimizing motor performance

and improving high-temperature stability

providing reliable technical support for energy-saving

emission reduction

and reduced maintenance requirements in scraper conveyors.