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振动的抑制是近年来开关磁阻电机研究的热门领域。该文提出一种在转子齿两侧开槽的方法,通过改变转子齿形来改变转子表面气隙磁密的方向,可以减小气隙中的径向磁密,同时增大切向磁密,达到抑制电磁振动的目的。利用二维瞬态有限元法,验证了转子齿两侧开槽对径向力波的削弱和转矩脉动的抑制效果,研究了开槽尺寸变化对仿真结果的影响规律,并对5.5k W、1000r/min、12/8极开关磁阻电机的开槽参数进行了优化,进行了样机的试制和试验。试验结果表明:该方法对开关磁阻电机的电磁振动有较好的抑制效果,但对电机的运行效率有一定影响。 相似文献
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类似于常规开关磁阻电机,无轴承开关磁阻电机的定、转子极宽并非总是相等,通常转子极宽略大于定子极宽,在建立数学模型时应当考虑这一因素.现有的无轴承开关磁阻电机数学模型都存在电机定、转子极宽相等的约束.考虑无轴承开关磁阻电机定、转子极宽可能存在的不相等因素,采用基于直线磁路和变椭圆系数的椭圆形磁路分割法求取气隙磁导,推导出无轴承开关磁阻电机的通用数学模型,使其不仅适用于定、转子极宽相等,而且适用于转子极宽大于定子极宽的情况.以实验室样机为例,将基于所建模型的分析结果与有限元分析结果进行了对比,验证了所建数学模型的正确性,精确度满足工程要求.应用所建立的无轴承开关磁阻电机数学模型,分析了定、转子极宽不等对悬浮力和转矩的显著影响. 相似文献
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针对同步磁阻电机转矩脉动大、平均转矩低的问题,提出一种星形转子结构,该结构与传统圆形转子结构相比,增大了转子气隙磁障末端与q轴的夹角,改变了气隙磁密的分布,可以减小转矩脉动,增大输出转矩。描述了星形曲线的形成过程,推导了星形曲线方程,得到参数方程参数角与磁障末端角的数学关系,为后续研究提供理论基础。基于等效磁路法建立了气隙磁密模型,进而可以得到转矩预测模型,并通过解析法和有限元进行对比,验证了磁路模型的有效性与正确性。通过有限元仿真,对星形转子结构同步磁阻电机和传统圆形转子结构同步磁阻电机进行性能对比分析,结果表明前者的铁耗小,气隙磁密波形谐波畸变率小,正弦化程度高,输出转矩大及转矩脉动小,验证了星形转子结构的可行性。 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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为降低开关磁阻电机转矩脉动以及提高转矩出力,提出一种在定转子齿上依次开槽的优化设计方案,对所开槽进行参数化处理,使用控制变量法分析各个开槽参数对性能指标的影响,以性能指标最优为目标选取参数,并利用有限元方法分析了电流转矩特性验证效果。由于该方案无法对多个开槽参数协同优化,因此进一步提出方案二,即借助多学科优化工具optiSLang,使用多目标粒子群算法对开槽参数进行全局优化,得到Pareto最优解集后再使用TOPSIS法客观地从中选取出全局最优解。优化后,与未开槽时相比,转矩脉动下降了32.347%,平均转矩上升了12.594%,效果令人满意。 相似文献
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开关磁阻电机转子斜槽结构可有效减小电磁径向力,但会导致转矩特性变化。针对该问题,给出了线性模型下斜槽转子开关磁阻电机稳态转矩的解析方法,然后建立了四相8/6极开关磁阻电机模型,采用三维有限元仿真方法,计及端部漏磁,以电流开通角、关断角和转子斜槽角度为优化参数,以平均转矩变化量最小和转矩脉动最小为优化目标,基于正交试验法设计试验方案,通过极差和方差分析确定了相应参数的优组合,并将优化前后的转矩特性进行了比较,结果表明:小的斜槽角度对转矩特性的影响并不大,优化后电机的平均转矩相比优化前只变化了16.01%,但其转矩脉动下降了23.63%。 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
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Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. These motors have combined the characteristics of switched reluctance motors and magnetic bearings. This paper proposes a method of determining the advanced angle of square-wave currents in a bearingless switched reluctance motor. Under any torque condition, from no load to full load, stable operation is realized by controlling the advanced angle of square-wave currents with the proposed method. It is shown experimentally that the proposed method is effective in realizing stable operation 相似文献
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无轴承开关磁阻电机(BSRM)由于容错性高、损耗小、效率高等优点在工业领域已得到广泛应用,但电机运行时振动会限制其在某些领域的应用。以混合励磁双定子BSRM为研究对象引入一种在定转子齿部开窗的方法,通过改变外定子或转子铁心磁阻大小,可以减小气隙中的磁密大小,达到减小电磁振动的目的。采用电磁有限元法与正交试验法优化窗口的位置和尺寸,验证转子开窗对外定子径向力和转矩的影响,最后通过模态叠加法验证转子开窗对振动响应的影响。结果表明,该方法对混合励磁双定子BSRM电磁振动有较好的抑制效果但对电机转矩有一定影响。 相似文献
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Torque ripple is a major problem for switched reluctance motors, which may cause undesirable vibration and acoustic noise, especially at low speed. This paper presents an optimal topology structure of rotor for 8/6 pole switched reluctance motor by using the level set method. The nonlinear ferromagnetic material boundary of rotor pole is implicitly represented through an embedded level set function. This method is applied to obtaining the optimal distributions of material in the design domain for minimizing torque ripple and maximizing average torque. In the optimization objective function, the reluctivity of ferromagnetic material is selected as the design variable. The normal velocity is derived from sensitivity analysis, where the adjoint variable method is utilized. Two-dimensional finite element method is employed to calculate the electromagnetic parameters of this electric machine. Analysis results obtained from the transient simulation of electromagnetic field coupled with control circuit show that the torque ripple is reduced effectively by using the optimized rotor structure. 相似文献
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三相无轴承异步电机的磁场定向控制 总被引:1,自引:0,他引:1
为实现三相无轴承异步电机的高性能悬浮和驱动控制,研究了4极转矩系统和2极磁悬浮系统的磁场定向控制问题.首先对转矩系统的气隙磁场定向和转子磁场定向控制进行了对比分析,然后分析了磁悬浮系统的磁场定向控制策略和非定极转子的感应补偿问题;最后,根据三相无轴承异步电机的运行控制特点,转矩系统采用了转子磁场定向、悬浮系统采用了气隙磁场定向和感应补偿的组合控制策略,对三相无轴承异步电机的控制系统进行了仿真和实验分析.结果表明:在额定转速范围内,可实现可靠的悬浮控制和良好的解耦控制性能.所采用的磁场定向控制策略是可行的. 相似文献
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在转子表面轴向开槽可以改善实心转子异步电机的起动性能。通过三维有限元法研究实心转子异步电机的电磁性能,可以充分考虑铁心饱和、端部效应和磁场轴向分布等因素,与样机实验数据比较,验证了三维有限元仿真建模的正确性和准确性。基于三维有限元模型的分析,得到转子开槽个数和深度对实心转子电机电磁性能的影响,说明了合理的开槽可以有效提高电机的起动转矩,研究结果能够为该类电机的优化设计提供依据。 相似文献