配变根据绕组材质不同可分为铜绕组变压器和铝绕组变压器,但相同容量的铝绕组变压器市场价格低于铜绕组变压器,存在"以铝充铜"的现象。鉴于此,本文介绍了一种基于热电效应法的配变绕组材质现场鉴别测试的方法,并通过17台配变...配变根据绕组材质不同可分为铜绕组变压器和铝绕组变压器,但相同容量的铝绕组变压器市场价格低于铜绕组变压器,存在"以铝充铜"的现象。鉴于此,本文介绍了一种基于热电效应法的配变绕组材质现场鉴别测试的方法,并通过17台配变的现场实测和吊罩检查,验证了该方法对于容量在500 k VA以下配变绕组材质鉴别方面具有可行性。展开更多
Aiming at the problem of large AC copper loss caused by skin effects and proximity effects,and low efficiency at high speed of the hairpin-winding permanent magnet synchronous motor(PMSM)for electric vehicles(EVs),thi...Aiming at the problem of large AC copper loss caused by skin effects and proximity effects,and low efficiency at high speed of the hairpin-winding permanent magnet synchronous motor(PMSM)for electric vehicles(EVs),this paper firstly established the electromagnetic analytical model of the hairpin winding to calculate AC resistance.And the finite element model(FEM)of the hairpin-winding driving motor is established to calculate the AC characteristic of the hairpin winding at different speeds and temperatures.Then,combining modified particle swarm optimization(MPSO)and FEM,a 60 k W hairpin-winding PMSM is optimized under driving cycle conditions,and the electromagnetic performance and heat dissipation performance are compared with that of the traditional strand-winding motor.Finally,a prototype is made and an experimental platform is built to test the efficiency Map and temperature rise of the hairpin-winding motor over the whole speed range and verify the accuracy of the proposed optimization design method.The results show that the hairpin-winding PMSM not only has higher slot filling rate,high?efficiency range and power density,but also has better heat dissipation performance,which is suitable for application in the field of electric vehicles.展开更多
文摘配变根据绕组材质不同可分为铜绕组变压器和铝绕组变压器,但相同容量的铝绕组变压器市场价格低于铜绕组变压器,存在"以铝充铜"的现象。鉴于此,本文介绍了一种基于热电效应法的配变绕组材质现场鉴别测试的方法,并通过17台配变的现场实测和吊罩检查,验证了该方法对于容量在500 k VA以下配变绕组材质鉴别方面具有可行性。
基金supported by the Fundamental Research Funds for the Central Universities(No.2019YJS181)。
文摘Aiming at the problem of large AC copper loss caused by skin effects and proximity effects,and low efficiency at high speed of the hairpin-winding permanent magnet synchronous motor(PMSM)for electric vehicles(EVs),this paper firstly established the electromagnetic analytical model of the hairpin winding to calculate AC resistance.And the finite element model(FEM)of the hairpin-winding driving motor is established to calculate the AC characteristic of the hairpin winding at different speeds and temperatures.Then,combining modified particle swarm optimization(MPSO)and FEM,a 60 k W hairpin-winding PMSM is optimized under driving cycle conditions,and the electromagnetic performance and heat dissipation performance are compared with that of the traditional strand-winding motor.Finally,a prototype is made and an experimental platform is built to test the efficiency Map and temperature rise of the hairpin-winding motor over the whole speed range and verify the accuracy of the proposed optimization design method.The results show that the hairpin-winding PMSM not only has higher slot filling rate,high?efficiency range and power density,but also has better heat dissipation performance,which is suitable for application in the field of electric vehicles.
