Research and industrial application of a novel compound permanent magnet synchronous machine

We propose a novel kind of compound permanent magnet synchronous machine （CPMSM）, which is applicable in low-speed and high-torque situations. We first explain the structure of the CPMSM. Based on theoretically deducing the calculation formulae of the CPMSM electromagnetic parameters, we analyze the operating characteristics of the CPMSM, and obtain the power-angle curves and working curves. The no-load magnetic field distribution and the cogging torque are analyzed by applying the finite element method of three-dimensional （3D） magnetic fields, to determine the no-load leakage coefficient and the waveform of the cogging torque. Furthermore, the optimal parameters of the permanent magnet for reducing the cogging torque are determined. An important application target of the CPMSM is in direct-drive pumping units. We have installed and tested a directdrive pumping unit in an existing oil well. Test results show that the power consUmption of the direct-drive pumping unit driven by CPMSM is 61.1% of that of the beam-pumping unit, and that the floor space and weight are only 50% of those of a beam-pumping unit. The noise output does not exceed 58 dB in a range of 1 m around the machine when the machine is 1.5 m from the ground.     

场路耦合有限元仿真在电机类课程教学中的应用研究

利用JMAG-Studio软件建立永磁电机的场路耦合的有限元模型,计算并分析永磁电机的空载和负载时瞬态特性,直观地展示电机的电流、反电动势、磁通密度、转矩等性能,并制作成基于电机转子旋转的动画,帮助学生深入理解电机的基本概念和知识,提高电气自动化类专业的电机类课程的教学效果。     

电动机控制系统在抽油机上的应用

本文研究目标是油田企业的永磁同步电动机抽油机的变频控制方案,介绍了目前抽油机的技术发展现状以及应用领域,给出了永磁同步电动机在抽油机上应用的控制方案,结果表明,将永磁同步电动机应用于抽油机能够明显提高其工作性能和节能指标。     

3D Magnetic Field Computation of a Permanent MagnetDisc-Type Generator Using Scalar Potential Method

The three-dimensional magnetic field of a permanent magnet (PM) disc-type generator is analyzed by the scalar potential method. In the analysis the permanent magnets are taken as magnetic charges. Hexahedron element meshes are automatically generated by a pre-processing program developed by the authors. The flux density is computed by a 3D scalar potential method program. Based on the finite element analysis the induced emf, current, armature reaction effects and electromagnetic torque of the disc machine are all calculated.     

新型磁通切换永磁直线电动机的静态特性

提出了一种应用于直线驱动数控机床的新型磁通切换永磁直线电动机.首先,给出了该电机的二维和三维拓扑结构,介绍了该直线电动机的基本工作原理,并分析了2种典型位置的磁场情况.其次,采用二维有限元的方法,对电机的磁链特性、反电动势特性、电感特性等静态特性进行了深入的研究.对2种不同铁芯结构磁通切换永磁直线电机的定位力进行了对比...     

表面磁钢永磁无刷电机电磁转矩的解析法分析

With the air gap magnetic field distribution of surface mounted permanent magnet （PM） motors obtained using an analytical technique, the instantaneous electromagnetic torque and its corresponding components are investigated with the Maxwell stress tensor method. Accurate results can easily be achieved using the proposed method without using the tedious finite element analysis （FEA）. In this paper, the electromagnetic torque of a surface mounted PM motor with two phases energized is decomposed into four torque components. This technique is useful not only for the design and optimization of the permanent magnet motor, but also for the choice of control strategy.     

表面磁钢永磁无刷电机电磁转矩的解析法分析

With the air gap magnetic field distribution of surface mounted permanent magnet (PM) motors obtained using an analytical technique, the instantaneous electromagnetic torque and its corresponding components are investigated with the Maxwell stress tensor method. Accurate results can easily be achieved using the proposed method without using the tedious finite element analysis (FEA). In this paper, the electromagnetic torque of a surface mounted PM motor with two phases energized is decomposed into four torque components. This technique is useful not only for the design and optimization of the permanent magnet motor, but also for the choice of control strategy.     

Design of permanent magnet synchronous generators for wave power generation

In this paper, a design method for ocean wave permanent magnet synchronous generator(PMSG)is proposed with new performance criteria to obtain better output performance at the cost of less permanent magnet material. Besides, a simple equivalent analytical geometry method is put forward to calculate the sizes of permanent magnets. Based on geometric and electromagnetic models, four types of rotor structures are compared, i.e., embedded, tangential, tile surface mount and convex surface mount structures. The designs and comparisons of machine are performed with the same permanent magnet volume. Moreover, the influences of mechanical pole-arc coefficient of tile surface mount PMSG on electrical efficiency, output power, material corrosion, core loss, and torque ripple are investigated. Finite-element analysis method is applied to verify the results using Ansoft/Maxwell.     

Analytical solutions for the two-dimensional magnetic fields in disc-type permanent magnet machines

Ｍａｇｎｅｔｉｃ Ｆｉｅｌｄｓ ｉｎ Ｄｉｓｃ－Ｔｙｐｅ Ｐｅｒｍａｎｅｎｔ Ｍａｇｎｅｔ ＭａｃｈｉｎｅｓTX１ＩｎｔｒｏｄｕｃｔｉｏｎＡｔｗｏ－ｄｉｍｅｎｓｉｏｎａｌ（２Ｄ）ａｎａｌｙｔｉｃａｌｍｅｔｈｏｄｆｏｒｃｏｍ－ｐｕｔｉｎｇｔｈｅａｘｉａｌ...     

稀土永磁铁磁场特性分析及有限元仿真分析

提供力学服务是永磁装置重要的用途之一,因而磁场力的计算是磁力在机械设计、应用的重要内容。本文介绍了公式算法的推导结果,通过公式法和ANSYS有限元分析两种方法对永磁铁样本进行磁场模拟计算,得到永磁体铁块的磁场特性和磁吸附力。最后通过实际测量永磁铁样本的磁感应强度验证了公式算法和有限元分析方式的合理性、可行性,分析了公式算法和有限元分析两种方式计算的磁力与实际磁场力的误差大小,并得到了永磁铁表面磁感应强度的变化规律。     

一种实用的混合动力摩托车永磁电机驱动系统

1　Introduction　Thedevelopmentofelectricvehicleshastakenonanacceleratedpacetofulfilltheneedofenvironmentprotectionandenergyconservation .However ,thedisadvantagesoflowenergydensityandshortperiodbetweenchargeshavebeenthebarriersforelectricvehiclestoenterthemarket.HybridEVsovercomethesebarriersandpossessesnearlythesameperfor manceasthetraditionalfuelvehicles.Therefore ,asanewtransportationtoolthatcanmeetrequirementsforenvironment protectionaswellashigh perfor mance ,hybridEVhasagoodmarketpote…     

基于ANSOFT的永磁同步电机电磁场分析

电机气隙是机电能量转换的重要区域,气隙中的磁通密度是电机设计的重要参数．对7．5kW永磁同步电机,通过有限元分析软件ANSOFT进行建模、定义材料属性和模型属性,经过剖分划网、加载边界条件和负载电流,求解偏微分方程组后,完成后处理,得到永磁同步电机气隙中的磁力线分布图和磁通密度分布图．分析结果为永磁同步电机的优化设计提供指导意义．     

用于精密控制的直线磁通切换永磁电动机的暂态性能分析

提出了一种适用于精密控制的新型直线磁通切换永磁(LFSPM)电机的动态dq数学模型.通过采用有限元法对LFSPM原型机进行数值仿真,分析该电机的运行原理并计算其反电动势、磁链等电磁参量.仿真和测量表明,该电机的反电动势和磁链均按正弦规律变化,并且在运行时具有与直线表面永磁电机(LSPM)相似的磁链变化规律.在此基础上,...     

稀土永磁同步无齿轮曳引机矢量控制变频调速

交流变频调速是当前电力拖动系统的主要发展方向,本文介绍稀土永磁同步无齿轮曳引机电动机磁路结构设计的特点和矢量控制变频调速系统,分析样机性能的实测数据,说明稀土永磁同步无齿轮曳引机矢量控制变频调速具有同步调速范围宽、转矩和转速平稳、效率和功率因数高等优点,是一种高效节能的电梯拖动调速系统。     

气流磨工艺对烧结NdFeB磁体组织与性能的影响

采用速凝法制备NdFeB薄带,再经氢破制粉、压型、烧结、热处理制备NdFeB永磁体,通过激光粒度分布仪、光学显微镜以及AMT-4磁学特性测量仪等手段表征磁体的组织和性能,考察气流磨工艺对磁体组织和性能的影响规律.研究结果表明:气流磨分选转速越快,磁粉粒度越细小,制备磁体的磁学性能先增加后减小,当气流磨分选转速为3 400 r/min时,制备磁体组织均匀,剩磁、矫顽力、最大磁能积分别达到14.19 kGs、907.44 kA/m和397.28 kJ/m3.     

Magnetic Field Analysis of Interior Composite-Rotor Controllable-Flux Permanent Magnet Synchronous Machine

* A conventional permanent magnet synchronousmachine (PMSM) is built to prevent demagnetizationeven under the extreme operatingconditions in the de-signing phase of rotor magnetic circuit and dimensionof permanent magnets (PMs). The magnet thicknessis large enough to keep the counter magnetic motiveforce (MMF) of armature less than coercive force inhigh temperatures[1]. If a conventional PMSMoperates in a wide speedrange, vector control strategy is always adopted. Bycontrollingd-axis dema…     

永磁轴承动力学性能分析

本文中给出了由一对磁环轴向充磁组成的轴向永磁轴承,并采用等效电流法计算两磁环之间的轴向力,阐明了永磁轴承在某一方向不稳定的原因。根据特定的永磁轴承实体模型,给出了其动力学方程,并对轴向的非线性运动方程用迦辽金法求出了方程的解析解。通过利用matlab软件进行仿真,证明了特定的永磁轴承在小气隙内磁环可以获得小振幅的稳定模态。     

磁力耦合技术在原油长输机泵上的运用

本文针对原油长输系统流量调节过程中机泵能耗高的现状,在原油长输机泵上研究应用磁力耦合技术,成功实施永磁调速驱动器技术改造,同时具备耦合驱动与调速功能,提高了原油输送系统整体运行的安全性与效率,为该技术的推广应用、拓展节能创效的空间奠定了基础。     

磁生物学效应研究中磁场发生装置的选择与温度控制

在磁生物效应研究中常用磁场发生装置的种类,可分为4类：永磁铁、亥姆霍兹线圈、螺线管、电磁铁,本文分析了由它们提供的磁场的物理特性,阐述了这些磁场发生装置的优缺点,总结出了它们各自的适用范围,根据进行磁生物效应研究时对磁场强度大小、频率的不同要求,提供了一个实用性比较强的磁场发生装置.除了永磁铁,其他的磁场发生装置必须通有一定强度的电流,使导线不断产热,使磁场区升温,而对实验结果造成影响.为避免通电导线产热后对磁场区的影响,稳定磁场区域的温度,本文提出了对磁场区域的控温方法.