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新型混合励磁双凸极永磁电机磁场调节特性分析及实验研究 总被引:2,自引:1,他引:1
提出一种新型带导磁桥的混合励磁双凸极电机,介绍电机的结构特点和磁场调节原理。采用简化等效磁路模型对气隙磁通调节范围、电励磁绕组的励磁磁势和并联导磁桥磁阻三者之间的关系进行分析,用有限元法获得样机磁场分布和磁场调节特性,设计制造了实验样机。样机实验结果不仅验证了理论分析的正确性,并表明:通过改变电励磁绕组电流的大小和方向,实现了电机内气隙磁场灵活调节与控制,有效解决了双凸极永磁电机难以实现电机气隙磁场调节的不足,在电动汽车等需宽调速直接驱动的场合具有应用前景。 相似文献
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把磁阻式结构与绕线式转子结构相结合,提出一种具有磁阻式无刷双馈电机的转子结构。该转子结构既保持了绕线式转子绕线接线方式的灵活性,又发挥了磁阻式转子对磁通的导向作用,改善了电机的磁场调制效果,可以很好地实现转子与定子两套绕组耦合能力实现最大化。对磁阻式转子结构的无刷双馈电机的设计原理和方法进行了详细分析,以一台30k W样机为例说明了磁阻式无刷双馈电机的功率分配曲线、气隙磁通密度曲线和电机效率,并与磁障结构的磁阻式、加入笼条的磁阻式转子无刷双馈电机在同等条件下的电机输出功率作对比。最后对无刷双馈发电系统的动态特性进行样机实验,实验结果表明采用该方法设计的磁阻式无刷双馈电机具有优良的性能。 相似文献
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基于轴向磁通切换规律和混合励磁技术,提出一种双转子混合励磁轴向磁通切换永磁(double-rotor hybrid excited axial switched-flux permanent magnet,DRHE-ASFPM)电机,由1个定子与2个转子构成,定/转子均采用凸极结构。定子由双"H"铁心与永磁体组成,电枢绕组和励磁绕组均绕于定子,转子无绕组和永磁体,结构简单,轴向长度短。该电机在继承轴向磁通切换永磁电机高功率/转矩密度的同时,能够实现磁场的灵活调节,且容错性能强。首先,分析DRHE-ASFPM电机最佳拓扑结构与混合励磁规律,探究电机的电磁设计原则和一般通用设计方法。其次,根据电机磁场的3D分布特征,构建3D有限元模型,分析电机的电磁性能,包括气隙磁密、磁链、反电势、转矩性能和调磁特性等,并计算电机的电磁参数。最后,基于分析设计结果,研制一台功率600W的试验样机,并进行实验测试与分析,验证DRHE-ASFPM电机设计理论与有限元分析计算的正确性和有效性。 相似文献
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具有磁阻效应的绕线式转子无刷双馈电机是一种新型电机,它利用了磁阻式转子的磁通导向作用和绕线式转子接线灵活的特点,具有转子耦合能力强、磁动势高次谐波含量低、电机输出功率密度高等优点。文中介绍这一新型混合式转子结构,并对基于该结构的无刷双馈电机在转子侧无绕组时电机的磁阻效应,以及在转子侧无磁阻效应时新绕组结构电机的电磁性能进行了分析。对定子侧结构相同、控制绕组侧施加相同激励情况下,采用新型混合式转子、双正弦绕线式转子的两种转子结构的无刷双馈电机进行了研究,对比了电机的气隙磁场、电机系统输出功率和电机效率。通过实验与仿真结果对采用新型混合式设计电机的动态性能进行了研究,验证了样机仿真结果的正确性,同时试验结果也表明新型混合式无刷发电机性能的优越性。 相似文献
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针对感应励磁发电机结构简单但励磁容量有限,永磁同步发电机磁场难以调节的问题,研究了一种将二者励磁功能相结合的混和励磁发电机。气隙中大部分磁场由转子上的永磁体提供,当需要调磁时,通过定子直流绕组与转子上感应绕组的感应作用,在感应绕组上获得调节磁动势,实现发电机磁场的调节。转子上两种励磁源为并联关系,调磁磁路磁阻小,无电刷-集电环系统,保证了发电机的结构简单、可靠性。在原理分析的基础上,使用二维有限元法对电机的磁场调节能力和负载特性进行分析,并进行了样机实验。有限元分析与实验结果都表明,与同结构参数的永磁同步发电机相比,混合励磁同步发电机具有灵活磁场调节能力;而相对于同一定子励磁磁动势的感应励磁发电机,该发电机输出容量大幅度提高,克服了感应励磁不适用于大容量发电的问题。 相似文献
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混合励磁磁通切换电机等效磁路模型 总被引:1,自引:0,他引:1
混合励磁磁通切换电机(flux-switching hybrid excitationmachine,FSHM)是一种新型定子励磁型交流无刷电机,具有磁链双极性、结构简单、功率密度高、运行可靠等优点。改变电励磁绕组电流的大小和方向,实现了对永磁气隙磁场的有效调节与控制,而引入导磁磁桥可提升气隙磁场调节范围。以建立电枢绕组磁链最大位置的等效磁路模型为切入点,推导了峰值磁通表达式,探索了磁桥段相对磁导率的估算方法,结合有限元仿真分析了磁桥厚度变化与磁桥式FSHM初始气隙磁密、磁桥磁密、气隙磁场调节能力、磁力线路径转移等特性的关系。样机的有限元仿真及实验结果与等效磁路模型预测趋势基本一致,验证了建模方法与理论分析的正确性,可用于指导磁通切换电机的设计与性能分析。 相似文献
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无刷双馈调速电机的绕组结构 总被引:9,自引:1,他引:9
本文研究了无刷双馈调速电机的定、转子绕组结构,并结合样机的研制(Pp=3,Pc=1)讨论了单定子绕组的组成、磁势与转子绕组的构成。虽然文中提出的绕组数据对电机的特性不是完美的,但提出的定、转子绕组的型式及定子绕组的出线对设计无刷双馈调速电机的单定子绕组及转子绕组是有指导意义的。 相似文献
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定子永磁式双转子电机电磁性能分析 总被引:1,自引:0,他引:1
为了提高双转子电机的转矩密度,实现其应用于混合动力汽车驱动系统的小型轻量化和平稳运行的需求,提出一种三相12/22/12极定子永磁式磁通切换双转子电机结构,其绕组和永磁体均位于外定子和内转子上,外转子上无绕组和永磁体,避免了外转子的冷却问题。对定子永磁式磁通切换双转子电机的拓扑结构及工作原理进行了介绍,采用有限元方法对电机磁场分布、气隙磁密、永磁磁链、空载反电动势、电感及转矩等电磁性能进行了分析。研究结果表明,提出的定子永磁式磁通切换双转子电机结构具有内外电机磁场耦合小、空载反电动势正弦性好、转矩密度大、转矩脉动小的特点,并通过原理样机实验结果验证了电机设计的有效性。 相似文献
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Novel Two-Phase Switched Reluctance Machine Using Common-Pole E-Core Structure: Concept, Analysis, and Experimental Verification 总被引:1,自引:0,他引:1
《Industry Applications, IEEE Transactions on》2009,45(2):703-711
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Low torque ripple in electrical machines is generally required to reduce acoustic noise and mechanical resonance vibration. To design for low torque ripple, however, affects the average torque and the power rating of the machine. In this paper, the effect of stator winding chording and rotor skewing on the average torque, power factor, and torque ripple of the normal laminated, internal flux barrier rotor reluctance synchronous machine is investigated. The two-dimensional finite-element time-step method together with the basic machine equations are used in the analysis. It is shown that to design, in general, for low torque ripple and minimal effect on torque rating of the reluctance synchronous machine, full-pitch stator windings must be used, the rotor must be skewed by a stator slot pitch, and a low number of stator slots must be avoided 相似文献
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展现了用于交流调速的无刷双馈电机的定子绕组结构,用三种方法对无刷双馈电机的定子绕组进行了设计,分析了三种定子绕组的优缺点,并得出了比较结论。 相似文献
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Double-rotor switched reluctance machine (DRSRM) integrates two switched reluctance machines (SRMs) into one housing, providing a compact solution for hybrid power trains so that one DRSRM can replace two electric machines. This paper presents a new DRSRM design in which the stator flux barriers are removed and the flux lines in the interior and exterior machines are more evenly distributed. The effects of stator flux barriers are investigated, the loss mechanism in the DRSRM is analyzed, and finally, various winding configurations are compared. It is concluded that flux lines are more evenly distributed in the stator, reducing iron saturation and losses, while the interior and exterior machines can be independently controlled without sacrificing performance. Moreover, winding polarity in DRSRM is critical to reduce stator iron saturation and thereby losses. 相似文献
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Guangjun Liu Xuefan Wang 《IEEJ Transactions on Electrical and Electronic Engineering》2016,11(1):112-123
In this paper, a 700‐kW brushless doubly fed induction generator (BDFIG) is designed for stand‐alone ship shaft generator application. Based on the principle of tooth harmonics and sinusoidal winding structure, a multi‐pitch unequal‐turn‐coil wound rotor is adopted to reduce harmonic contents and couple the two stator windings effectively. The performance analyses of a prototype BDFIG with two/four pole pairs are presented. The magnetic fields, air‐gap flux densities, and current densities with full load at different shaft speeds of the prototype machine are investigated. Simulation analysis and experimental tests verify that the output capability and the efficiency of the prototype machine could meet the design requirements of a 700‐kW generator and that the wound rotor structure is suitable for high‐power brushless doubly fed machines. © 2015 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
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Switched reluctance drives have been shown to benefit from DC flux assistance from a coil arrangement that is mutually coupled to all its phase windings. This paper proposes an alternative way of providing this additional DC flux through the use of a toroidal, axially orientated coil. A reluctance machine is constructed and tested in which the stator comprises two stacks separated by a coil to give axial magnetic flux. This construction is similar to a homopolar inductor alternator. The paper describes and develops the complex magnetic structure of the machine and describes initial test results. The ideal angular orientation between the two stator stacks is presented. 相似文献