场路结合法设计分析内置式永磁同步电动机

采用场路结合法设计稀土永磁同步电动机.运用有限元分析软件ANSYS计算永磁同步电动机电磁系数,针对15 kW永磁同步电动机的设计,计算与分析样机的交直轴电枢反应电抗,并对气隙和永磁体磁化方向长度等结构参数对电机性能的影响进行了分析.     

电动汽车用永磁同步电动机饱和电抗参数计算

针对电动汽车用永磁同步电动机饱和电抗参数难于准确计算的问题,提出了采用基于修正相对磁导率的饱和电抗参数计算方法。本文以一台10kW的电动汽车用永磁同步电动机为研究对象,通过建立二维静态场数学模型,计算永磁电动机的电抗参数随电流变化的曲线和电动机额定负载时的同步电抗值。计算结果表明这种计算方法可以充分考虑磁场的非线性以及交直轴的耦合作用,通过该方法计算的永磁同步电动机饱和电抗参数为电动机本体的电磁计算以及电动机驱动系统的设计提供重要的参考依据。     

永磁同步电动机电抗值的计算及其对性能的影响

对永磁同步电动机稳态电抗值的3种计算方法进行了分析和比较,确认用“负载法”计算最为精确,结合样机实测数据,讨论了电抗值对永磁电动机性能的影响,提出了电抗参数设计的最佳值。     

轨道交通用永磁同步牵引电机电抗参数的有限元分析

永磁同步牵引电机具有体积小、功率密度大、过载能力强、效率和功率因数高等特点,而电抗参数对永磁同步牵引电机的设计以及电机运行时平衡恒转矩转折速度点与弱磁恒功率最高速度点的性能有较大影响。本文利用Ansoft有限元分析软件对永磁同步电动机的交直轴同步电抗进行了计算,得出了交直轴电抗参数随电机参数的变化曲线,并分析了电机参数对电抗参数的影响。     

永磁同步电动机电磁参数的有限元分析

建立了永磁同步电动机漏磁系数和交直轴同步电抗的场路结合数学模型,并利用Maxwell 2D软件的参数化分析工具对永磁同步电动机的空载漏磁系数和交直轴同步电抗进行了计算,得出了这些参数随电机结构参数的变化曲线.在此基础上,总结了永磁同步电动机电抗参数的变化规律,为永磁同步电动机的优化设计提供了一种非常直观有效的方法.     

永磁同步电动机电抗参数的准确计算

1.引言 永磁同步电动机较之传统的电励磁电动机,以其具有体积小、重量轻、效率高而备受青睐,因而对永磁同步电动机设计计算的研究日益受到重视,而电枢反应电抗X_(ad)和X_(aq)参数的精确计算一直是困扰该类电机设计的一个难题,这两个电抗参数对永磁同步电动机的运行性能至关重要。理论研究表明,X_(ad)/X_(aq)比值的大小,对电机牵入同步过程中电机的牵入能力有很大影响。若X_(ad)、X_(aq)计算偏差过大,则有可能产生理论计算电机可牵入同步,而实际上却不能,这方面曾有过教训。因此,对这两个参数的准确计算是设计成功的关键。     

高压永磁同步电动机转子不同结构的起动性能分析

高压永磁自起动同步电动机从起动到牵入同步过程是一个复杂的机电瞬变过程.在电动机设计过程中,如何使电动机的起动性能、牵入性能以及稳态运行的过载性能达到协调统一是个不容忽视的问题.基于永磁电动机转子结构的改进,本文对高压永磁同步电动机的起动过程进行了数字仿真,研究了动态起动过程,研究了直轴同步电抗、交轴同步电抗以及两种同步电抗的比值对起动转矩、牵入转矩以及失步转矩的影响,并在分析过程中结合所得结论对一台315kW、6kV高压永磁自起动同步电动机及其改进结构进行了研究论证.仿真及试验结果表明,转子结构改进后的高压永磁同步电动机在起动过程中的几种性能上各有所长,互有得失,所得这些结论对推动高压永磁自起动同步电动机的实际运用具有指导意义.     

基于稀土永磁同步电动机起动特性研究转子磁路结构设计

稀土永磁同步电动机由于转子磁路结构不对称产生的凸极效应转矩和永磁体产生的发电机制动转矩,影响起动过程的性能,严重情况下致使无法牵入同步运行。本文基于稀土永磁同步电动机起动过程特性的理论分析,结合典型规格样机参数与性能的计算值和起动过程的电磁转矩的实测曲线,阐述d、q轴电抗对起动过程性能的影响,研究永磁同步电动机转子磁路结构设计。     

纺织用永磁同步电动机过载性能计算与研究

纺织机械配套的永磁同步电动机,要求其具有较强的过载能力,满足系统运行的稳定性和工作环境的安全性。通过"负载法"测试影响纺织永磁同步电动机过载性能的参数,研究相应的测试理论,构建了测试平台,并导出过载性能及其相应参数的计算公式。通过数据处理和计算得到最大功率角和同步电抗参数值,求取了电机的过载性能。计算与实测数据比较,验证了理论分析和计算方法的正确性与精确性,为该类电机过载性能的设计及优化提供参考。     

混合励磁永磁发电机电抗参数研究

针对混合励磁永磁同步发电机的特殊磁路结构,介绍了一种用以计算交、直轴电抗参数的计算方法。利用该方法计算了1台7.5 kW、1 500 r/min的混合励磁永磁发电机的交轴电抗和直轴电抗,利用试验测试电抗参数对计算结果进行了验证。结果显示,所提混合励磁永磁同步发电机交、直轴电抗参数计算方法计算精度较高,为混合励磁永磁同步发电机结构参数和电抗参数的合理设计提供了帮助。     

无轴承永磁同步电机的转子磁场定向控制研究

无轴承永磁同步电机由于功率密度大、转矩脉动低等优良特性受到了高度重视。文中针对一类表面贴装式无轴承永磁同步电机，详细推导出径向悬浮力表达式，建立了准确的数学模型。针对电磁转矩和径向悬浮力之间耦合的特点，采用了基于转子磁场定向的控制策略来实现这类无轴承永磁同步电机的非线性解耦控制。实验证明了该控制算法的有效性。该控制算法对插入式转子结构和内装式转子结构的无轴承永磁同步电机的控制系统设计具有一定的借鉴作用。     

基于NEDC路谱的对称与非对称型永磁同步电机优化设计

用于电动汽车的永磁同步电机不仅需要考虑额定工况的性能,还需要考虑整个路谱下的综合效率。基于此,介绍了一种基于新标欧洲循环测试(NEDC)路谱的非对称V型内嵌式永磁同步电机优化设计方法。将上述非对称电机中永磁体上下两部分的几何参数分别作为独立参数进行参数化建模,然后以NEDC效率和转矩成本比为优化目标,采用遗传算法分别对对称和非对称V型永磁同步电机进行多目标优化。最后,选取帕累托前沿上的最佳设计点进行电磁性能仿真比较。仿真结果表明,与对称结构相比,非对称转子结构由于磁场偏移效应而表现出更强的转矩性能。因此,非对称V型永磁同步电机具有更加优异的电磁性能和更低的制造成本,在电动汽车领域具有广阔的应用前景。     

Machine parameters and performance of interior permanent magnet synchronous motors with different permanent magnet volume

Permanent magnet synchronous motors are widely used for several industrial applications. Some applications such as electric vehicles and compressor drives require a constant power operation. The operating limits and the constant power speed range deeply depend on the machine parameters. The relationships between the motor parameters and the operating performance have been theoretically examined. This paper examines the performances of the prototype synchronous motors, where the stator structure and the rotor structure of all motors are the same. The permanent magnets are inserted into the rotor slits and the volume of the permanent magnet is adjusted to control the magnet‐flux linkage. The effects of adding the magnet to the rotor on the machine parameters and the operating performance are examined based on the various experimental results. The prototype motor has flexibility as to speed versus power performance by adjusting the volume of the permanent magnet. The theoretical results with respect to the operating limits and the motor parameters are also confirmed experimentally. © 2000 Scripta Technica, Electr Eng Jpn, 131(4): 70–77, 2000     

同步磁阻电机性能分析与研究

针对永磁同步电动机(PMSM)用材多、成本高等问题,开发了成本低、效率高的同步磁阻电机(SRM)产品,在部分工况下替代PMSM,实现高效率电动机的推广。对2.2 k W、4极SRM的结构、电磁参数、控制方式等关键技术展开研究,为产品的系列化设计提供了理论基础,对电机设计人员有一定的参考价值。     

真空泵用反凸极永磁同步电机设计与性能分析

针对真空泵用驱动电机运行过程中存在转子温度高、散热难的问题,根据真空泵驱动工况的实际要求,设计了一台反凸极永磁同步电机和一台常规永磁同步电机。首先,利用有限元软件,分析了转子磁障尺寸对电机转矩的影响以及磁障层数对电感的影响,从而得出了转子磁障尺寸和磁障层数的合适值;其次,对两台电机的气隙磁密波形、空载反电动势和损耗等电磁性能进行了对比分析;最后,通过仿真对比分析了两台电机的温度场以及两者转子和转轴处的温升。结果表明,相比于常规永磁同步电机,反凸极永磁同步电机的转矩性能更好、转子损耗和转子温升更小,为新产品研发提供了科学的参考依据。     

Characteristics of a permanent magnet type bearingless motor

Super high-speed and high-power electric machines are required for turbomolecular pumps and spindle drives. High rotational speed and high power drives can be achieved with bearingless motors. In this paper, a bearingless motor with the principles of permanent magnet type synchronous motors is proposed. High power factor and high efficiency can be expected in permanent magnet type bearingless motors. The proposed bearingless motor is a 4 pole permanent magnet synchronous motor, in which additional 2-pole windings are wound together with 4-pole motor windings in stator slots. With currents of 2-pole windings, radial magnetic forces are produced to support a rotor shaft. Principles of radial force production of surface-mounted permanent magnet bearingless motors are analyzed mathematically. It was found that radial forces are efficiently produced by employing thin permanent magnets on the surface of rotor iron core. A test machine was built in order to measure inductance functions as well as relationships between voltages and currents     

内置式永磁同步电机不同转子拓扑结构对电机性能的影响分析

为了研究不同转子拓扑结构对8极48槽内置式永磁同步电机(IPMSM)的电磁性能和噪声性能的影响,分别建立了单层无隔磁桥、单层有隔磁桥、双层无隔磁桥以及双层有隔磁桥转子拓扑结构的内置式永磁同步电机的有限元模型。除转子拓扑结构以外,四种电机的定子拓扑结构、永磁体使用量等其它条件完全相同。首先,对电机电磁性能和噪声性能进行相关的理论分析。其次,建立四种电机的有限元模型,对四种电机的凸极率、输出转矩、转矩脉动以及空载反电势谐波畸变率等电磁性能进行比较分析,并对四种电机进行模态分析。最后,比较了四种电机的振动响应和噪声特性。结果表明,双层有隔磁桥转子结构的内置式永磁同步电机电磁性能最好,并且其噪声削弱效果也最好。     

A Hybrid Interior Rotor High-performance Line Start Permanent Magnet Synchronous Motor

Abstract—This article describes the development of a line start permanent magnet synchronous motor with a rotor containing interior mounted magnets. The rotor is a hybrid of both circumferentially as well as radially magnetized magnets arranged so it produces consequent poles. Steady-state and transient performances of the line start permanent magnet synchronous motors have been analyzed by using time-stepping finite-element analysis. Simulation results show that the optimum performance of the rotor is achieved for a specific magnet volume, a substantial improvement on performances of all such rotors reported so far (based on the detailed study of all these rotor types). The hybrid rotor has improved the synchronous performance of the machine without degrading its starting characteristics when compared with an equivalent induction motor. Two experimental prototypes of the proposed design have been built in the laboratory, and their performances have been compared with the performance of a conventional line start permanent magnet synchronous motor having only circumferentially magnetized magnets in its rotor, as well as that of a standard induction motor of the same frame size and physical dimensions. The results indicate that the proposed hybrid interior rotor significantly improves machine performance.     

Design Method for Improving Motor Efficiency of Switched Reluctance Motor

The motor efficiencies of switched reluctance motors (SRMs) are inferior to those of permanent magnet synchronous motors. This paper describes a design procedure for an SRM to obtain a higher motor efficiency. The first step in the design procedure makes clear the principle for improving the motor efficiency. The cross‐sectional and axial shapes of the rotor and stator cores are designed by magnetic field analysis with the two‐dimensional (2D) and 3D finite element method. A high‐efficiency SRM with 12 stator poles and eight rotor poles is designed. The designed SRM was produced experimentally, and was tested to verify its performance. The motor efficiency was improved in comparison to the standard SRM with six stator poles and four rotor poles.     

基于Ansys的永磁同步电机转子振动分析

振动是电机的重要指标,对电机转子进行振动分析为其结构改进和性能优化提供理论依据。运用Ansys有限元分析软件对永磁同步电机转子进行模态分析,得到该电机转子振动系统的低阶固有频率和模态振型,分析了电机振动特性。通过电机转子模态试验,求得电机低阶固有频率,对比仿真与试验结果,验证有限元分析结果的可靠性。由结果分析可知,研究对象在额定转速下未产生共振,验证了其结构设计的合理性。研究内容对永磁同步电机的设计和优化有一定的指导意义。