Heat and thermal problems are major obstacles to achieving high power density in compact permanent magnet(PM)topologies.Consequently,a comprehensive,accurate,and rapid temperature rise estimation method is required fo...Heat and thermal problems are major obstacles to achieving high power density in compact permanent magnet(PM)topologies.Consequently,a comprehensive,accurate,and rapid temperature rise estimation method is required for novel electric machines to ensure safe and reliable operations.A unique three-dimensional(3D)lumped parameter thermal network(LPTN)is presented for accurate thermal modeling of a newly developed outer-rotor hybrid-PM flux switching generator(OR-HPMFSG)for direct-drive applications.First,the losses of the OR-HPMFSG are calculated using 3D finite element analysis(FEA).Subsequently,all machine components considering the thermal contact resistance,anisotropic thermal conductivity of materials,and various heat flow paths are comprehensively modeled based on the thermal resistances.In the proposed 3-D LPTN,internal nodes are considered to predict the average temperature as well as the hot spots of all active and passive components.Experimental measurements are performed on a prototype OR-HPMFSG to validate the efficiency of the 3-D LPTN.A comparison of the results at various operating points between the developed 3-D LPTN,experimental test,and FEA indicates that the 3-D LPTN quickly approximates the hotspot and mean temperature of all components under both transient and steady states with high accuracy.展开更多
研究自然冷却的无槽管状永磁直线电机(tubular permanent magnet linear actuator,TPMLA)的机械气隙长度,通过约束和引导热量的流通路径来使永磁体的温度达到最低。通常无槽绕组产生的热量必须首先通过周围的空气进行传导,其散热条件比...研究自然冷却的无槽管状永磁直线电机(tubular permanent magnet linear actuator,TPMLA)的机械气隙长度,通过约束和引导热量的流通路径来使永磁体的温度达到最低。通常无槽绕组产生的热量必须首先通过周围的空气进行传导,其散热条件比有槽电机更加恶劣。虽然较小的机械气隙可以增强气隙磁密,但是绕组产生的大部分热量将会传到永磁体上,导致永磁体温升,并减小其剩磁,使永磁体有失磁风险。因此,合理的机械气隙长度对于无槽管状永磁直线电机极其重要。建立电机的电磁和热模型,并将结果与有限元方法进行比较。制作3台不同机械气隙的样机,并进行实验。结果表明,机械气隙对限制和引导热流具有重要的作用,通过增加机械气隙长度来降低永磁体温度的方法取得了良好的效果。展开更多
文摘Heat and thermal problems are major obstacles to achieving high power density in compact permanent magnet(PM)topologies.Consequently,a comprehensive,accurate,and rapid temperature rise estimation method is required for novel electric machines to ensure safe and reliable operations.A unique three-dimensional(3D)lumped parameter thermal network(LPTN)is presented for accurate thermal modeling of a newly developed outer-rotor hybrid-PM flux switching generator(OR-HPMFSG)for direct-drive applications.First,the losses of the OR-HPMFSG are calculated using 3D finite element analysis(FEA).Subsequently,all machine components considering the thermal contact resistance,anisotropic thermal conductivity of materials,and various heat flow paths are comprehensively modeled based on the thermal resistances.In the proposed 3-D LPTN,internal nodes are considered to predict the average temperature as well as the hot spots of all active and passive components.Experimental measurements are performed on a prototype OR-HPMFSG to validate the efficiency of the 3-D LPTN.A comparison of the results at various operating points between the developed 3-D LPTN,experimental test,and FEA indicates that the 3-D LPTN quickly approximates the hotspot and mean temperature of all components under both transient and steady states with high accuracy.
文摘研究自然冷却的无槽管状永磁直线电机(tubular permanent magnet linear actuator,TPMLA)的机械气隙长度,通过约束和引导热量的流通路径来使永磁体的温度达到最低。通常无槽绕组产生的热量必须首先通过周围的空气进行传导,其散热条件比有槽电机更加恶劣。虽然较小的机械气隙可以增强气隙磁密,但是绕组产生的大部分热量将会传到永磁体上,导致永磁体温升,并减小其剩磁,使永磁体有失磁风险。因此,合理的机械气隙长度对于无槽管状永磁直线电机极其重要。建立电机的电磁和热模型,并将结果与有限元方法进行比较。制作3台不同机械气隙的样机,并进行实验。结果表明,机械气隙对限制和引导热流具有重要的作用,通过增加机械气隙长度来降低永磁体温度的方法取得了良好的效果。
