关键词: 无刷直流电机, 高转速, 磁路热路联合设计

Abstract: Aiming at the application requirements of brushless DC motor( BLDCM) in high-speed servo systems such as aerospace and unmanned aerial vehicle, this paper proposes a magnetically-thermally coupled optimization design method. Taking a 4-pole 15-slot surface-mounted permanent magnet BLDCM as the research object,the core dimensional parameters are determined via the magnetic circuit method. ANSYS static is adopted to conduct static mechanical verification of the rotor,An ANSYS Maxwell 2D field-circuit coupled model was established to analyze the electromagnetic performance, while a Motor-CAD thermal network model was developed to characterize the temperature rise in tooth-slot regions and windings. Experimental validation on a prototype was conducted to verify the design effectiveness. The results show that: (1) the electromagnetic performance meets the requirements ( rated conditions: torque ripple less than 5%, efficiency higher than 82%) ; (2) the winding temperature rise is not exceed 70 K ( with a class F insulation margin higher than 50%) ;(3) the deviation between measured and simulated results is less than 5%. This study provides theoretical support and experimental evidence for the engineering design of high-speed BLDCM.

Key words: brushless DC motor, high speed rotation, magnetically-thermally coupled design