In this paper,a new equivalent magnetic network(EMN)model is established for a spoke-type permanent magnet(PM)vernier(PMV)machine.Two different modeling methods are proposed for different parts of the PMV machine,cons...In this paper,a new equivalent magnetic network(EMN)model is established for a spoke-type permanent magnet(PM)vernier(PMV)machine.Two different modeling methods are proposed for different parts of the PMV machine,considering that their magnetic field distributions are quite different.Hierarchical modeling method is proposed for the modeling of the rotor as the magnetic intensity of the rotor iron core presents gradient distribution along the radial direction.Mesh based reluctance network method is used for the modeling of flux modulation poles with irregular and unstable magnetic field distributions.Moreover,accurate PM leakage permeance calculation formulae are deduced to improve the simulation precision.The electromagnetic parameters,such as flux linkage,back electromagnetic force,electromagnetic torque and iron loss are predicted by the proposed EMN model.Finally,finite element analysis(FEA)and experimental results are given to verify the effectiveness of the proposed methods.展开更多
In this paper,a 20kW vehicle built-in permanent magnet synchronous motor is taken as an example,and a magnetic barrier structure is added to the rotor of the motor to solve the uneven saturation problem of the rotor s...In this paper,a 20kW vehicle built-in permanent magnet synchronous motor is taken as an example,and a magnetic barrier structure is added to the rotor of the motor to solve the uneven saturation problem of the rotor side magnetic bridge.This structure improves the air-gap flux density waveform of the motor by influencing the internal magnetic flux path of the motor rotor,thus improving the sine of the no-load back EMF waveform of the motor and reducing the torque ripple of the motor.At the same time,Taguchi method is used to optimize the structural parameters of the added magnetic barrier.In order to facilitate the analysis of its uneven saturation phenomenon and improve the optimization effect,a simple equivalent magnetic network(EMN)model considering the uneven saturation of rotor magnetic bridge is established in this paper,and the initial values of optimization factors are selected based on this model.Finally,the no-load back EMF waveform distortion rate,torque ripple and output torque of the optimized motor are compared and analyzed,and the influence of magnetic barrier structure parameters on the electromagnetic performance of the motor is also analyzed.The results show that the optimized motor can not change the output torque of the motor as much as possible on the basis of reducing the waveform distortion rate of no-load back EMF and torque ripple.展开更多
软磁复合材料因其突出的高频特性而被广泛用作变压器和电机的铁心材料。为了提高高频磁化下变压器或电机的效率与功率密度,需要提高产品设计阶段铁损的计算精度。该文提出一种基于梯形等效电路与神经网络结合的动态磁滞模型,可用以计算...软磁复合材料因其突出的高频特性而被广泛用作变压器和电机的铁心材料。为了提高高频磁化下变压器或电机的效率与功率密度,需要提高产品设计阶段铁损的计算精度。该文提出一种基于梯形等效电路与神经网络结合的动态磁滞模型,可用以计算高频软磁复合材料铁损。该模型通过非理想电感、恒定电阻和非线性电阻分别计算静态磁滞损耗、涡流损耗和异常损耗;其中,为了提高低磁密下静态磁滞回环的模拟精度,引入能够表征磁化过程的神经网络算法模拟静态磁滞部分;同时,在采用梯形等效电路计算涡流损耗和异常损耗时,考虑趋肤效应对铁损的影响;最后,搭建高频正弦激励下的软磁材料磁特性测试系统,在频率为1 Hz~10 k Hz范围内对软磁复合材料的磁滞回线和铁损进行实验测量,并将铁损计算方法与实测数据进行对比,验证该模型在高频正弦激励下预估损耗的准确性,为变压器和电动机优化设计提供一种模型结构简单、精度较高且工程实用性强的损耗计算方法。展开更多
含有中继线圈的三线圈无线电能传输(wireless power transfer,WPT)系统可以提高系统的传输距离和传输效率。文章基于耦合电感模型分析,并建立传统串联/串联/串联(series/series/series,S/S/S)补偿结构的三线圈磁耦合系统数学模型,但该...含有中继线圈的三线圈无线电能传输(wireless power transfer,WPT)系统可以提高系统的传输距离和传输效率。文章基于耦合电感模型分析,并建立传统串联/串联/串联(series/series/series,S/S/S)补偿结构的三线圈磁耦合系统数学模型,但该数学模型不够直观,不易对磁耦合系统除自感谐振式外的其他补偿参数确定方法进行分析。因此,提出利用变压器T网络模型进行三线圈磁耦合系统建模的新方法。基于所获得的解耦电路模型和等效漏感补偿理论,确定串联/串联/串联-并联(series/series/series-parallel,S/S/SP)、并联/串联/串联(parallel/series/series,P/S/S)、并联/串联/串联-并联(parallel/series/series-parallel, P/S/SP)补偿结构,提出S/S/S、S/S/SP、P/S/S、P/S/SP补偿结构的参数确定方法。所提方法在磁耦合系统不变的情况下,通过补偿电容及等效变比的设计,获得可变增益恒压的输出特性。该方法电路模型简单,设计思路清晰,参数选择灵活,有助于拓宽输出电压增益范围。展开更多
基金Supported by National Natural Science Foundation of China under Grant 51577084Key Project of Natural Science Foundation of Jiangsu Higher Education Institutions under Grant 15KJA470002the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘In this paper,a new equivalent magnetic network(EMN)model is established for a spoke-type permanent magnet(PM)vernier(PMV)machine.Two different modeling methods are proposed for different parts of the PMV machine,considering that their magnetic field distributions are quite different.Hierarchical modeling method is proposed for the modeling of the rotor as the magnetic intensity of the rotor iron core presents gradient distribution along the radial direction.Mesh based reluctance network method is used for the modeling of flux modulation poles with irregular and unstable magnetic field distributions.Moreover,accurate PM leakage permeance calculation formulae are deduced to improve the simulation precision.The electromagnetic parameters,such as flux linkage,back electromagnetic force,electromagnetic torque and iron loss are predicted by the proposed EMN model.Finally,finite element analysis(FEA)and experimental results are given to verify the effectiveness of the proposed methods.
基金supported by the National Natural Science Funds of China No.51907129Technology program of Liaoning province No.2021-MS-236。
文摘In this paper,a 20kW vehicle built-in permanent magnet synchronous motor is taken as an example,and a magnetic barrier structure is added to the rotor of the motor to solve the uneven saturation problem of the rotor side magnetic bridge.This structure improves the air-gap flux density waveform of the motor by influencing the internal magnetic flux path of the motor rotor,thus improving the sine of the no-load back EMF waveform of the motor and reducing the torque ripple of the motor.At the same time,Taguchi method is used to optimize the structural parameters of the added magnetic barrier.In order to facilitate the analysis of its uneven saturation phenomenon and improve the optimization effect,a simple equivalent magnetic network(EMN)model considering the uneven saturation of rotor magnetic bridge is established in this paper,and the initial values of optimization factors are selected based on this model.Finally,the no-load back EMF waveform distortion rate,torque ripple and output torque of the optimized motor are compared and analyzed,and the influence of magnetic barrier structure parameters on the electromagnetic performance of the motor is also analyzed.The results show that the optimized motor can not change the output torque of the motor as much as possible on the basis of reducing the waveform distortion rate of no-load back EMF and torque ripple.
文摘软磁复合材料因其突出的高频特性而被广泛用作变压器和电机的铁心材料。为了提高高频磁化下变压器或电机的效率与功率密度,需要提高产品设计阶段铁损的计算精度。该文提出一种基于梯形等效电路与神经网络结合的动态磁滞模型,可用以计算高频软磁复合材料铁损。该模型通过非理想电感、恒定电阻和非线性电阻分别计算静态磁滞损耗、涡流损耗和异常损耗;其中,为了提高低磁密下静态磁滞回环的模拟精度,引入能够表征磁化过程的神经网络算法模拟静态磁滞部分;同时,在采用梯形等效电路计算涡流损耗和异常损耗时,考虑趋肤效应对铁损的影响;最后,搭建高频正弦激励下的软磁材料磁特性测试系统,在频率为1 Hz~10 k Hz范围内对软磁复合材料的磁滞回线和铁损进行实验测量,并将铁损计算方法与实测数据进行对比,验证该模型在高频正弦激励下预估损耗的准确性,为变压器和电动机优化设计提供一种模型结构简单、精度较高且工程实用性强的损耗计算方法。
文摘含有中继线圈的三线圈无线电能传输(wireless power transfer,WPT)系统可以提高系统的传输距离和传输效率。文章基于耦合电感模型分析,并建立传统串联/串联/串联(series/series/series,S/S/S)补偿结构的三线圈磁耦合系统数学模型,但该数学模型不够直观,不易对磁耦合系统除自感谐振式外的其他补偿参数确定方法进行分析。因此,提出利用变压器T网络模型进行三线圈磁耦合系统建模的新方法。基于所获得的解耦电路模型和等效漏感补偿理论,确定串联/串联/串联-并联(series/series/series-parallel,S/S/SP)、并联/串联/串联(parallel/series/series,P/S/S)、并联/串联/串联-并联(parallel/series/series-parallel, P/S/SP)补偿结构,提出S/S/S、S/S/SP、P/S/S、P/S/SP补偿结构的参数确定方法。所提方法在磁耦合系统不变的情况下,通过补偿电容及等效变比的设计,获得可变增益恒压的输出特性。该方法电路模型简单,设计思路清晰,参数选择灵活,有助于拓宽输出电压增益范围。
