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基于麦克斯韦应力法的双绕组无轴承开关磁阻电机新型数学模型 总被引:1,自引:0,他引:1
现有的双绕组无轴承开关磁阻电机麦克斯韦应力法数学模型忽略了相互垂直方向上径向悬浮力的耦合,但当转子偏离定转子齿极中心对齐位置较大时存在较强的耦合,故现有模型难以满足高精确度稳定悬浮控制要求。选择一种计及相互垂直方向悬浮力耦合的新积分路径,建立了基于麦克斯韦应力法的双绕组无轴承开关磁阻电机新型数学模型,同时为计及电机磁路的饱和特性,采用最小二乘法对铁心材料的非线性磁化曲线进行拟合,求解考虑磁饱和的各气隙磁密。通过与有限元仿真结果对比,验证了所建模型不仅揭示了相互垂直方向上径向悬浮力的耦合关系,考虑了磁饱和特性,且具有精确度良好、计算量小等优点,为实现高精度稳定悬浮控制奠定了基础。 相似文献
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一种无轴承开关磁阻电机独立控制策略 总被引:3,自引:1,他引:2
基于无轴承开关磁阻电机中平均转矩和径向悬浮力之间独立控制的思想,研究了一种新型的控制策略。其中主绕组电流单、双相交替工作,悬浮绕组电流固定开关角轮流导通15°,实现无轴承电机转矩和悬浮的独立控制并建立该控制策略下的瞬时转矩、平均转矩和径向悬浮力的计算公式,阐述电机控制参数和控制依据,分析了该控制策略的工作区域。仿真和实验结果均证实了理论分析的正确性和可行性。 相似文献
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分析了12/8极磁悬浮开关磁阻电动机的悬浮力产生机理,建立了电机非线性磁链Maxwell 2D模型.通过有限元计算,研究了转子角变化对铁心磁饱和程度的影响,给出了悬浮力和磁饱和特性的定量关系.计算结果表明,与近似线性磁链模型下悬浮力与副绕组电流呈线性递增关系相比,实际电机的悬浮力与副绕组电流呈严重非线性关系并存在减小区间.该研究对电机优化设计和控制具有一定的理论价值. 相似文献
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无轴承开关磁阻电机磁场及力特性的分析 总被引:6,自引:0,他引:6
分析了无轴承开关磁阻电机(SRM)径向悬浮力产生原理.考虑磁饱和,以非线性磁化曲线为基础,建立了无轴承SRM的ANSYS有限元二维模型,对一台原理样机进行了电磁场分析,计算了转矩与悬浮力特性.将计算结果与采用线性磁化曲线时的有限元结果进行了比较,结果显示出考虑磁饱和的必要性,同时为样机的有效控制奠定了基础. 相似文献
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一种无轴承开关磁阻电机悬浮性能分析 总被引:1,自引:0,他引:1
提出了一种新型结构无轴承开关磁阻电机,其结构简化,运行过程中不需要切换控制绕组,降低了控制系统的复杂性。分析了该电机的结构特点和悬浮原理,并基于有限元计算法对新型结构电机和常规结构电机进行了比较,包括:1)两种电机在旋转过程中转子径向气隙磁密分布、径向力产生情况以及产生悬浮力的同时对静态输出转矩的影响;2)比较了控制绕组通电电流变化时产生径向力情况及对静态旋转转矩的影响。性能分析及比较结果表明,新型结构无轴承开关磁阻电机具有优良的悬浮与旋转性能,研究结果为该电机的进一步建模及运行控制建立了基础。 相似文献
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无轴承高速开关磁阻电机设计中的关键问题 总被引:2,自引:0,他引:2
讨论了无轴承开关磁阻电机在高速运行时的电磁设计、结构强度、稳定性设计、转子应力设计、散热设计、磁性材料选择等关键技术问题,给出了在设计过程中应注意的问题和优化设计的方法依据。考虑上述电机设计原则,对一台7.5kW无轴承开关磁阻电机进行了电磁和结构参数的优化设计,建立了基于ANSYS的二维有限元模型,对径向悬浮力和转矩特性进行了计算,比较了仿真和理论计算结果;在实验样机上测量了主绕组、悬浮绕组电感。结果表明,该设计方法满足了无轴承高速开关磁阻电机的设计要求,对进一步进行参数优化具有参考价值。 相似文献
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串励式无轴承开关磁阻发电机(BSRG)的稳定悬浮发电取决于对各绕组电流的合理控制,而在其运行状态和负载情况相同时,电流又取决于绕组电感和悬浮力,因此二者的准确计算是设计和控制该电机的关键。建立了串励式BSRG的二维有限元模型,计算了悬浮绕组电感。结合实际控制策略,在不同磁动势组合下,研究了串励式BSRG的悬浮力特性。 相似文献
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磁悬浮直线开关磁阻电机继承了直线开关磁阻电机的优点,结合有效的悬浮设计方案,在磁悬浮运输系统中具有一定的应用潜力。研究了磁悬浮直线开关磁阻电机的悬浮模块及其改进结构,分析磁场分布和磁路模型,在此基础上,利用有限元软件进行仿真,通过结果分析发现所提出结构具有天然解耦的结构特点,可以实现悬浮力控制和推力控制解耦以及悬浮力控制与动子前进位置解耦,通过线性调节悬浮电流即可线性控制悬浮力,使悬浮电流控制为标量控制,大大降低了悬浮控制系统的复杂性。此外,改进结构可以有效提高悬浮电流利用率,减小悬浮绕组损耗。 相似文献
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Radial Force Analytic Modeling for a Novel Bearingless Switched Reluctance Motor When Considering Rotor Eccentricity 总被引:1,自引:0,他引:1
Abstract—Analytic modeling of radial forces is proposed for the novel bearingless switched reluctance motor, where the rotor eccentricity is taken into account. The novel bearingless switched reluctance motor's model is never disclosed, even though there are many advantages, such as fewer suspension windings and simpler control circuit and algorithm, when compared to the conventional bearingless switched reluctance motor. The analytic model of radial forces is very important to achieve this new bearingless switched reluctance motor's suspension control. The rotor eccentricity is a key cause to affect the radial forces. This article calculates the air-gap permeances through considering rotor eccentricity. The self-inductance and mutual-inductance expressions of the motor torque windings and the suspension windings are derived by using the magnetic equivalent circuit method. The derived radial force model discloses the effects of winding currents, rotor position angle, and rotor eccentricity displacement. The finite-element analysis based results verify the built model. 相似文献
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基于有限元法的磁悬浮开关磁阻电机数学模型 总被引:12,自引:2,他引:12
当电机高速运行时,为避免机械磨损,采用电磁力进行悬浮支撑,而磁轴承占用轴向空间,限制临界转速。磁悬浮开关磁阻电机利用电机定子与轴承机械结构的相似性,在原有的电机定子绕组上附加一套径向力绕组,通过一定的控制策略,同时实现电机的旋转和悬浮。该文在利用有限元软件Ansoft/ Maxwell 2D分析磁悬浮开关磁阻电机磁场的基础上,结合等效磁回路法并根据虚位移定理,推导出磁悬浮开关磁阻电机在考虑a、b轴方向径向偏移及其耦合时的径向力和转矩的数学模型,并用有限元分析结果验证了该模型的正确性和有效性。 相似文献
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Theoretical equations of magnetic force in an induction bearingless motor have been reported. In the bearing‐less motor, both 4‐pole and 2‐pole windings are stored in stator slots for torque and suspension force generation. In the analysis, squirrel cage rotor currents are considered. These currents are induced by both torque and suspension winding currents. Inductance matrix is represented by four sets of three‐phase windings, thus a 12×12 matrix is constructed. A simplification and reasonable assumptions are introduced to obtain understandable expressions for suspension force and torque representation. The rotor flux linkages in an induction bearingless motor are derived, and a simulation model of suspension force is then constructed. It is shown that the response and the phase of suspension force are delayed in the case of cage rotors. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 159(3): 77–87, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20340 相似文献
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为了解决宽转子无轴承开关磁阻电机由于开关型供电方式以及双凸极铁心结构在运行过程中容易导致转矩脉动很大的问题,本文对其转子极结构进行改进,提出在转子极两侧开槽的优化设计方案。旨在通过增大开槽处的气隙磁阻,提高用于产生转矩的切向分量的气隙磁密,从而降低转矩脉动。对所开槽进行参数化处理,使用控制变量法分析各开槽参数对转矩性能的影响,以性能指标最优为目标确定开槽参数。利用场路耦合的方法将电机有限元分析模型和直接瞬时转矩控制电路模型结合起来,实现电机系统的动态运行。仿真结果表明转子极开槽后能够有效降低宽转子无轴承开关磁阻电机的转矩脉动,提升平均转矩,并且对径向悬浮力的影响很小。 相似文献
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Masatsugu Takemoto Akira Chiba Hirofumi Akagi Tadashi Fukao 《Electrical Engineering in Japan》2006,157(2):72-82
Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. The bearingless switched reluctance motors are characterized by integration of switched reluctance motors and magnetic bearings. These motors have two kinds of stator windings composed of motor main windings and suspension windings in the same stator in order to produce suspension force that can realize rotor shaft suspension without mechanical contacts or lubrication. For successful stable operation, accurate theoretical formulas of instantaneous torque and suspension force are necessary to a rotational speed controller and a rotor radial position controller. This paper derives the theoretical formulas of the instantaneous torque and the suspension force from an assumption of simple permeance distribution. This derivation process makes an assumption that fringing fluxes are distributed on elliptical lines. It is shown with experimental results that the derived theoretical formulas are very accurate in terms of practical application. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(2): 72–82, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20157 相似文献
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针对传统磁悬浮开关磁阻电机的输出转矩小及转矩与悬浮的耦合问题,提出一种四相16/14/8极混合励磁双定子磁悬浮开关磁阻电机。介绍了该电机的拓扑结构、转矩原理与悬浮原理,并优化了转矩绕组的励磁方式,运用有限元法比较分析了该电机与同参数不加永磁体电机的电磁特性,包括电机的转矩特性以及解耦特性,仿真结果验证了该电机自解耦结构的合理性及能有效提高输出转矩。在麦克斯韦应力法基础上,根据电机工作时的磁通分布建立了等效磁路图,采用分段函数拟合铁芯磁化曲线,推导出了考虑磁饱和的转矩数学模型,有限元仿真分析验证了转矩模型与仿真结果较吻合,最小相差约1.4%,最大相差约26%。 相似文献
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Radial force and torque of a bearingless switched reluctance motor operating in a region of magnetic saturation 总被引:1,自引:0,他引:1
Takemoto M. Chiba A. Akagi H. Fukao T. 《Industry Applications, IEEE Transactions on》2004,40(1):103-112
Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. These motors are characterized by integration of switched reluctance motors and magnetic bearings. It is essential for a control system to consider magnetic saturation in real time in order to realize stable operation at a full torque load. Thus, this paper proposes a method for fast calculation of radial force and torque of a bearingless switched reluctance motor operating in a region of magnetic saturation. It is shown experimentally that the proposed method is effective in calculating the radial force and the torque under conditions of magnetic saturation. 相似文献