共查询到20条相似文献,搜索用时 187 毫秒
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采用解耦磁集成方法,结合磁路-电路对偶变换,得到LLC谐振变换器UIU磁芯结构的三线圈磁集成模型。分析了UIU磁芯三线圈磁芯结构,建立UIU磁路-电路等效模型,推导出以UIU磁芯为基础的LLC变换器三线圈集成设计公式。仿真磁通分布表明在缩小体积和减小边缘磁通方面,UIU磁芯结构优于传统EE磁芯结构。使用UIU磁芯结构建立三线圈模型进行瞬态电磁场分析和温度场分析,表明该磁芯结构工作磁通密度和工作温度符合设计要求。设计1台谐振频率180 kHz、输出功率10 W的实验样机,实验结果验证了UIU磁芯结构三线圈模型的适用性和有效性。 相似文献
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针对交流电感器设计难以优化的问题,通过对交流电感器各约束条件如电感量、损耗、体积、温升等与电感器结构参数之间的关系进行分析,提出了一种基于四维可视化技术的交流电感器优化设计方法。通过分别优化电感器设计要求的各约束条件,取得最优区域的电感器结构参数求解域,然后在电磁场有限元分析软件中建立该结构参数的仿真模型,对电感量、最大磁通密度和温升等进行了评估;最后根据优化参数绕制了一个交流电感器进行实验。仿真与实验结论表明通过该优化算法,只需通过1次循环计算即可得到满足各约束条件的电感器,可避免磁芯电感器设计的盲目性。 相似文献
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采用无线电能传输是开展移动式直流应急保障的有效途径。提出了一种适用于移动式直流应急无线充电模块的铁氧体磁芯设计和优化方法,可进一步提高发射器与接收器之间的未对准误差容限、降低磁芯损耗。当无线充电模块发射器与接收器之间存在未对准误差时,磁通密度不再均匀,磁芯损耗也随之增加。因而,应通过磁芯优化设计使得磁芯各处磁通均匀分布以及损耗降低。经综合考虑,提出了一种分段线性圆形和附加条形磁芯的优化结构,并提出基于有限元连续非线性规划优化算法,可使得磁通密度分布均匀和降低损耗。经仿真验证,与原始磁芯结构相比,优化后的圆形磁芯结构可降低单位体积磁芯损耗,另加附加条形磁芯优化后可使单位体积磁芯损耗降低39%,并且优化后的磁芯,单位损耗的磁芯体积可减少17. 5%。 相似文献
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在分析高频电感器线圈涡流损耗构成及起因的基础上,提出通过设计电感器磁压以减小其线圈涡流损耗的研究思路,并据此研究思路,提出一种具有分布磁压的新型高频电感器磁芯结构。新结构通过在开集中气隙的高磁导率磁芯柱与线圈间加入低磁导率磁材料,为电感器的磁压分布构造一辅助磁路,进而使电感器线圈窗口内的磁场分布均匀化,大大减小了线圈涡流损耗。与已有的高频电感器磁芯比较,新结构工艺简单且不增加磁芯损耗。应用电磁场有限元仿真软件对新型分布磁压结构进行了分析与设计,给出了设计指导,并进行了实验验证。 相似文献
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Yoshihito Yoshizawa Yoshio Been Kiyotaka Yamauchi Hosaki Sugihara 《Electrical Engineering in Japan》1993,113(1):26-33
Magnetic properties of Fe-Cu-Nb-X-B (X Si, Ge, C, Ga) and Fe-Cu-Nb-Si-B-X (X: Ge, C, P, Ga, Al) nanocrystalline alloys were studied to improve soft magnetic properties and they were evaluated for some applications. Si was the best element for the Fe-Cu-Nb-X-B system. Substitution of P for B made the coercive force small in the Fe-Cu-Nb-Si-B-X system having high saturation flux density. The cores using the Fe-based nanocrystalline alloys showed low core loss, excellent dc superimposed characteristics and good noise attenuation characteristics. Hence, Fc-based nanocrystalline alloys have high performance for such magnetic components as transformers and choke coils. 相似文献
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当前开关电源不断向"小、轻、薄"方向发展,减小储能元件厚度成为提高开关电源功率密度的一个有效方法。此处以小功率有源箝位DC/DC模块电源应用为例,分析和研究了穿孔平板磁技术,设计了一种新结构磁器件以提高模块电源的功率密度,并针对有源箝位模块电源进行了穿孔平板磁器件的设计与应用。首先介绍了穿孔平板变压器、穿孔平板电感的基本结构,基于磁路理论分析了磁芯单元磁通分布、磁感应强度等性能,进而针对模块设计了磁器件的具体参数,并用有限元软件进行仿真验证,实际运行也证实了设计的有效性。 相似文献
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AKIRA KOHARA KATSUHIRO HIRATA NOBORU NIGUCHI YUKI OHNO 《Electrical Engineering in Japan》2017,200(3):52-60
This paper proposes a novel variable flux reluctance motor without dc‐field coils. The stator of this motor has only armature coils. The proposed motor can control the torque‐speed characteristics by increasing or decreasing the field voltage that is superimposed on the armature currents. In this paper, the operational principle of the motor is described, and the N–T characteristics are computed by finite element analysis under vector control. In addition, the N–T characteristics are compared with a conventional variable flux reluctance machine with armature and dc‐field coils. 相似文献
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S. V. Kudryashov 《Russian Electrical Engineering》2008,79(4):192-195
A method for calculating iron loss in switched-reluctance motors is given. It is necessary to separate the elements of the magnetic system of an electric motor in order to calculate the magnetic flux density according to the turning angle of the rotor. Then, calculations of losses due to hysteresis and eddy current are conducted. The described method can be applied for the verification and design of inductor motors. 相似文献
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为了适应电压调整模块(VRM)未来的发展趋势,满足功率日益增加的负载点电源(POL: point-of-load)的设计要求,同时为倍流整流输出电感的磁集成设计等提供参考,本文将以两通道耦合电感为例,详细讨论其在两通道交错并联开关变换器中应用的参数设计和对电气特性的影响;建立电路和磁路的对应关系,提出评价耦合电感的性能因子;分析通道电流纹波相互抵消的特点,结合电流谐波分量,说明耦合电感线圈损耗减少的机理;建立完整的交直流磁通分布,为耦合电感工作在直流不平衡的情况下提供理论依据,并对理论分析进行实验验证 相似文献
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A non‐isolated high step‐up DC‐DC converter with integrated 3 winding coupled inductor and reduced switch voltage stress 下载免费PDF全文
Mohsen Mahmoudi Ali Ajami Ebrahim Babaei 《International Journal of Circuit Theory and Applications》2018,46(10):1879-1898
In this paper, a non‐isolated high step‐up dc‐dc converter based on coupled inductor is proposed. The proposed converter can be used in renewable energy applications. In suggested converter, the high voltage is achieved using 3‐winding coupled inductor, which leads to low voltage rate of the switch. A clamp circuit is used to recycle the leakage inductance energy. Also, the clamp circuit prevents the creation of voltage spikes on semiconductor devices and causes the voltage stress of elements are limited to less than the output voltage. The presented theoretical analyses show that the operation of suggested converter in continuous conduction mode needs to small magnetic inductor. Therefore, the size of coupled inductor's core is reduced, and so the size and cost of presented converter will be decreased. Analysis of the proposed converter is provided with laboratory results to verify its performance. 相似文献