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针对准确计算转矩十分困难的问题,系统研究由人为选择的计算参数对低速轴向磁场永磁同步电动机(低速永磁电动机,Ls-A-Pmsm)三维磁场及转矩计算结果的影响.首先从理论上分析影响转矩的因素,然后通过实例计算,分析空间离散采用不同单元类型、不同剖分密度、轴向等效气隙尺寸以及麦克斯韦应力法不同计算路径等计算参数对计算结果的影... 相似文献
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为提高电动汽车驱动性能,以电动汽车驱动系统要求为目标,进行永磁同步电动机功率、电枢直径、计算长度和转子结构参数设计,并进行场路结合设计计算.利用以上参数设计了电动汽车用永磁同步电动机样机,进行了驱动电机系统台架试验.实验结果表明,永磁同步电动机低速转矩大、恒功率区宽、温升低,满足电动车的需要. 相似文献
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1.前言本文论述永磁低速同步电动机的电子计算机计算。永磁低速同步电动机是属于感应子式电机的范畴,这种低速同步电动机可分为两大类,其一是反应式低速同步电动机,另一类是永磁低速同步电动机。本文论述的计算程序虽然是为永磁低速同步电动机编制的,但略加修改亦可用于反应式低速同步电动机的设计或电磁核算。感应子式低速同步电动机又称减速式电动机。电机转轴不需经过任何形式的机械减速装置,就可以直接获得输出轴的低速运转。反应式低速同步电动机的转速n_(?)可以表示为 相似文献
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提出了数值分析中高速直接转矩控制的永磁同步电动机(PMSM)的转子损耗,利用DSP基仿真程序模拟实际的直接转矩控制永磁同步电动机的性能,计算空载和额定转矩时的定子电流。结果表明,相同转速下的中、高速直接转矩控制的永磁同步电动机空载运行时的转子损耗要比额定负载下运行时的转子损耗高很多,并将在7500r/min下运行的直接转矩控制的永磁同步电动机的转子损耗计算值与空载损耗测试值进行了对比。 相似文献
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低速大转矩永磁同步电动机设计 总被引:1,自引:0,他引:1
结合一台15kW抽油机用直驱式永磁同步电动机,研究了低速大转矩永磁同步电动机的一般设计方法和相关问题;为消除低速时的转矩脉动,采用了分数槽绕组、合理设计极弧系数、定子斜槽等措施;用Ansoft软件对气隙磁密波形、磁场分布、反电动势波形的仿真结果表明,这些措施可以有效消除气隙磁场的高次谐波,进而消除低速时的转矩脉动;实际... 相似文献
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采用d、q坐标系统,建立单相永磁式低速同步电动机异步起动数学模型,计算起动过程中存在的各次谐波电流和谐波转矩,分析它们对电机起动性能的影响。该方法可以应用于一般的单相永磁式和反应同步电动机。 相似文献
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Vesa Ruuskanen Paula Immonen Janne Nerg Juha Pyrh?nen 《Electrical Engineering (Archiv fur Elektrotechnik)》2012,94(2):97-106
An algorithm to calculate the electrical efficiency of permanent magnet synchronous machines with four different control methods is presented. The direct- and quadrature-axis stator current components are optimized to find the control method producing the maximum electrical efficiency. The developed computation algorithm was tested with three different permanent magnet synchronous machine applications, i.e., a low-speed high-torque direct-driven wind power generator with rotor surface magnets, a hybrid drive for an energy recovery system and a geared wind power generator with rotor buried magnets. The performance of the developed computation algorithm was verified by comparing the calculated electrical efficiencies with the measurements in the case of the hybrid drive machine. 相似文献
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简要介绍了一种新型直线电机的结构和原理,用MAGNET软件对具有不同结构的电机的电磁场进行了数值计算。通过计算得出了低速永磁直线同步电机的二维磁场分布和气隙磁密的变化波形。为设计新型低速永磁直线同步电动机提供了一种方法。 相似文献
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电动机作为现代工业的重要动力来源,在目前“双碳战略”的政策背景下,探究如何改善其节能环保和稳定工作的性能是一个重要的课题。目前广泛使用的重载机械传动装置是感应电机+减速器的模式,由于感应电机本身的特性,难以实现变频控制,且在低速下运行不平稳,而减速器的存在既降低了传动的效率,又增大了整个机械装置的维护工作量。综上所述,这种重载装置不能适应节能环保的需要。而低速大转矩永磁同步电动机能够在低速时稳定运行,并且输出的转矩足够大,加上高效率、维护工作量小、尺寸设计灵活等特点,使用低速大转矩永磁同步电动机替代传统重载传动装置将是工业的一个重要发展方向。 相似文献
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针对电励磁爪极电机效率低、永磁爪极电机磁场调节困难的问题,探讨一种新型串联磁路混合励磁爪极同步发电机,分析其结构及其工作原理,利用磁路计算方法和三维有限元的分析对电机进行了仿真,确定了合理的磁钢厚度和合适的极对数。 相似文献
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—An improved topology for a low-speed permanent magnet vernier machine, called a dual-stator interior permanent magnet vernier machine, is introduced to significantly increase torque density and power factor. A dual-stator is adopted in the design for more torque and improving space utilization. An interior spoke-type magnet array in the rotor is designed for magnet flux focusing, which can effectively increase useful flux and force flux lines to pass through the entire machine during operation as opposed to two separate torque components as in a normal dual-stator permanent magnet machine. To clearly place the advantages of the proposed topology in perspective, the proposed dual-stator interior permanent magnet vernier machine is compared to a well-known dual-stator surface-mounted permanent magnet vernier machine. This article discusses the operation principle and magnetic field analysis of the proposed machine and reports comparison simulation results taken from the finite-element method. In addition, the stator tooth is optimized for further better performance on torque density and power factor. 相似文献
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Small-power electric machines that use permanent magnets for providing field excitation are becoming increasingly attractive for use in various industrial applications, including those with high-torque requirements andspace limitations. There exists a wide range of designs based on different topologies and different types of magnetic materials. The cost-effectiveness of permanent magnet (PM) machine designs couldbe affected to a great extent by the choice of the magnet material, the overall size of the machine, and the selection of the most appropriate materials, taking into consideration their relative costs and properties. This paper presents an analytical approach to design a surface-magnet electric machine with optimum use of materials on cost basis. Influence of major design parameters is examined, as well using sensitivity analysis. The results show that the optimum split ratio is inversely related to the remanence of the chosen magnet. Also, the impact of the core saturation level on the overall machine cost is investigated. 相似文献