高转矩密度磁力齿轮的拓扑结构设计与性能比较

永磁行星齿轮和同轴永磁齿轮是两类具有不同拓扑结构和运行原理的磁力齿轮,采用定量设计比较法设计了具有相同有效体积和永磁体用量的上述两类磁齿轮,并通过有限元分析法对二者的转矩传递性能进行比较研究。研究结果表明,永磁行星齿轮较同轴永磁齿轮有更高的转矩密度和更低的转矩脉动。此外,由于永磁行星齿轮具有更加灵活的运行模式,并且能实现功率分流,使其在混合动力汽车领域有很好的应用前景。加工了一台永磁行星齿轮样机,并搭建试验平台进行了相关的试验,结果表明了该拓扑结构的有效性。     

专利快讯

专利名称:人工心脏用永磁轴承双定子盘式无刷直流电动机专利申请号:CN201010174305.6公开号:CN102255463A申请日:2010.05.17公开日:2011.11.23申请人:北京天高智机技术开发公司本发明属于一种医疗器械,具体涉及一种人工心脏用永磁轴承     

轴流式人工心脏泵混合磁悬浮系统的耦合特性

植入式人工心脏泵要求体积小、质量轻、功耗低,为了满足这些要求,需要研究磁悬浮人工心脏泵的轴承特性。为此,对径向永磁轴承自身的耦合特性进行了理论分析与仿真,据此提出了心脏泵转子的磁悬浮支承方案,该方案采用两个径向永磁轴承和一个轴向电磁轴承来实现转子的五自由度稳定悬浮。根据径向永磁轴承的磁场分布特性,提出了采用两个关于转子轴线对称布置的霍尔传感器,从转子径向方向检测转子轴向位移的方法,理论分析揭示了转子径向位移和轴向位移在检测结果中的耦合关系,并给出了解耦方法,得出了轴向位移。基于研究成果设计了轴流式磁悬浮人工心脏泵原型机,并成功实现了转子的五自由度稳定悬浮。     

磁齿轮复合永磁电机综述

磁齿轮复合永磁电机将磁齿轮传动装置与永磁同步电机集成于一体,不仅继承永磁电机功率密度大和可靠性高等诸多优点,且结构紧凑、传动效率高,在汽车牵引、风力发电、工业传动和航空航天等领域具有广阔的发展空间。阐述了磁齿轮和磁齿轮复合电机的研究现状,以及磁齿轮复合电机的应用和发展;对几种典型的新型磁齿轮复合电机进行了详细介绍,探讨了磁齿轮复合电机的发展趋势。     

新型双方向激磁轴向磁齿轮的设计与研究

永磁齿轮是一种没有物理接触的齿轮,具有传统机械齿轮不具备的优点。双方向永磁体激磁的轴向永磁齿轮属于磁场调制式永磁齿轮的一种,为了充分利用装置的内部空间,加装了轴向激磁的永磁体,同时研究开发了一种特殊结构的调磁环,该调磁环结构充分考虑了永磁体的端部漏磁,对端部漏磁加以利用,调磁环同时对轴起到支撑作用,可以很好地解决装配问题。另外用有限元法对新结构的永磁齿轮进行了优化,仿真计算结果显示,新结构的永磁齿轮转矩传递平稳可靠。     

磁悬浮人工心脏泵驱动电动机及控制研究

介绍了一种可用于人工心脏泵的爪极永磁步进电动机的结构与设计方法.电动机采用AT89S51单片机输出三种波形(方波、正弦波、梯形波)作为驱动激励信号,改变驱动激励信号的频率可以改变该人工心脏泵转子的转速,即可达到调节和控制血液输出的流量及压力.人工心脏泵的结构既适用于离心式人工心脏泵,也适用于轴流式人工心脏泵,可满足生命医学工程领域中的相关实验要求.在无接触的磁悬浮支承下,电动机可以使人工心脏泵获得更优越的性能.     

多端口永磁式行星齿轮设计与电磁性能分析

针对永磁式行星齿轮设计中的电磁问题进行了系统研究。通过对永磁式行星齿轮设计中的关键问题的理论和仿真分析,提出了永磁式行星齿轮设计的基本原则,在此基础上设计了一台高转矩密度、低定位力矩的永磁式行星齿轮。基于有限元仿真软件进行电磁参数计算,验证了结构的合理性。加工了样机,对样机的永磁太阳轮的最大传递转矩进行了试验,试验结果验证了上述设计和优化方法的有效性。     

无接触永磁齿轮传动机构发展综述

普通齿轮传动存在摩擦、噪音、效率低等缺点;无接触永磁齿轮变速传动以能够削弱这些缺点而引起人们的关注.对永磁齿轮发展进行综述.介绍常见的变速传动方式以及永磁齿轮发展历程,阐述永磁齿轮的工作原理及其基本结构.     

基于永磁同步电机和电磁轴承的人工心脏研究

提出了的新型可植入式人工心脏是由轴向磁场结构的永磁同步电动机直接发驱动。电机转子安装在人工心脏泵的叶轮上,并因电磁轴承的作用而悬浮。文中将重点分析该电机及轴承的结构与设计,并给出了一些相关的仿直结果。     

平行轴永磁齿轮的特性研究

永磁齿轮利用永磁磁场的相互耦合作用产生磁性力来实现非接触传动。采用有限元法求得了永磁齿轮的磁场，进而采用虚功原理求得了磁力矩以及永磁齿轮的矩角特性。通过仿真分析了动轮随主动轮转动的机理。制作了实验模型，实验结果验证了分析方法的正确性。     

三种充磁方式轴向磁齿轮的磁场和转矩特性比较

依据永磁体充磁方向和排列方式的不同,轴向磁齿轮可分为轴向充磁磁齿轮、聚磁式轴向磁齿轮和Halbach式轴向磁齿轮。采用3D有限元法对三种轴向磁齿轮的磁场、转矩特性和轴向力进行了比较。基于气隙磁场的谐波分析,利用公式计算出各次谐波磁场产生的转矩和轴向力,得出各次谐波磁场对转矩传递和轴向力的作用。比较表明,聚磁式轴向磁齿轮的转矩能力和永磁体利用率最大,比轴向充磁磁齿轮提高了17.5%和32.6%,比Halbach式轴向磁齿轮提高了2%和15.1%。Halbach式轴向磁齿轮的气隙中引起转矩波动的磁场谐波的幅值最小,转矩波动也最小。轴向充磁磁齿轮低速转子的轴向力最小,比聚磁式轴向磁齿轮小38.3%,比Halbach式轴向磁齿轮小32.7%。     

磁场调制式磁力齿轮及其有限元计算

为避免机械齿轮振动,或要在分开物体间传递力矩,可以采用磁力齿轮传动装置。设计该磁力传动装置时需要对其设计参数进行精确计算。在电机设计时,使用有限元方法对一种大力矩磁力齿轮——磁场调制式磁力齿轮进行了磁场计算,为设计该磁力齿轮提供了有力的工具。     

A Novel Magnetic Harmonic Gear

Magnetic gears offer several advantages compared to mechanical gears in terms of reduced maintenance, improved reliability, and inherent overload protection while having a high efficiency. This paper describes the principle of operation of a novel form of magnetic gear, which is particularly suited to applications for which a high gear ratio is required. The performance capability of such a magnetic gear is investigated, and it is shown that it transmits a ripple-free torque and that an active torque density of up to 150 $hbox{kN}cdot hbox{m/m}^{3}$ per stage can be achieved when high-energy permanent magnets are employed. Simulation results on this novel gear are verified by experimental measurements on a prototype.      

Development of a high-performance magnetic gear

This paper presents calculation and measurement results of a high-performance permanent-magnetic gear. The analyzed permanent-magnetic gear has a gear ratio of 5.5 and is able to deliver 27 N/spl middot/m. The analysis has shown that special attention needs to be paid to the system where the gear is to be installed because of a low natural torsion spring constant. The analyzed gear was also constructed in practice in order to validate the analysis and predict the efficiency. The measured torque from the magnetic gear was only 16 N/spl middot/m reduced by the large end-effects. A systematic analysis of the loss components in the magnetic gear is also performed in order to figure out why the efficiency for the actual construction was only 81%. A large magnetic loss component originated in the bearings, where an unplanned extra bearing was necessary due to mechanical problems. Without the losses of magnetic origin in the bearings and less end-effects caused by relatively short stack, an impressive efficiency estimated at 96% can be obtained. Comparison with classical mechanical gears has shown that the magnetic gear has a better efficiency and a comparable torque per volume density. Finally, it is concluded that the results in this paper may help to initiate a shift from mechanical gears to magnetic gears.     

阻尼绕组对磁力齿轮动态特性的改善

与传统机械齿轮相比,磁场调制式磁力齿轮输入与输出轴之间非机械连接,具有无磨损、无润滑、大速比与过载保护等特点,使得其在变速机械方面具有特殊应用价值。然而,由于两转子间存在非刚性磁耦合特性,导致在启动以及负载和速度发生变化时,出现暂态振荡现象。为了提高整个传动系统的动态稳定性,提出一种在高速转子侧增加阻尼绕组的结构设计,在电磁场有限元分析基础上,建立了动态仿真模型,对磁力齿轮增加阻尼绕组前后动态性能进行对比研究,结果证明阻尼绕组结构能有效减小传动系统的振荡幅值,缩短调节时间。     

双磁场调制磁齿轮转矩能力增强特性分析

磁齿轮能够实现低速大转矩输出。为了进一步提高同轴磁齿轮的输出能力,提出一种双磁场调制磁齿轮拓扑结构。双磁场调制磁齿轮将传统的表贴式同轴磁齿轮低速转子侧的转子轭用辅助调磁环代替,结构上包含2个转子,2个调磁环和3层气隙。分析双磁场调制磁齿轮的工作原理,采用有限元法,对新增调磁环的尺寸进行了优化。对比分析双磁场调制磁齿轮和传统表贴式同轴磁齿轮的磁场分布和传动转矩。不同传动比下,双磁场调制磁齿轮的转矩能力普遍高于传统表贴式同轴磁齿轮。当传动比为7.5时,双磁场调制磁齿轮的低速转子最大输出转矩达到70.81N·m,与相同尺寸的传统表贴式同轴磁齿轮相比,转矩能力提升了54%。稳定运行时,双磁场调制磁齿轮的低速转子转矩脉动有所增大。     

Torque characteristics and application of two‐phase induction motor driven by two power supplies with nearby frequencies

When two power supplies with nearby frequencies are connected to a two‐phase induction motor, the motor generates two kinds of oscillatory torque components, which have frequency components of the sum and the difference between the frequencies of the power supplies. These oscillatory torque components are sinusoidal, and the torque with the frequency component of the difference is considerably larger than the torque with the frequency component of the summation. Consequently, the motor behaves as a swing motor, which alternately changes the direction of rotation. Because of the regularity of the period of the human heartbeat, this swing motor is suitable for use as the driver of an artificial heart. We propose here to use this swing motor as the pump for artificial hearts. In this paper, we present the fundamental theory and the characteristics of the swing motor, and an outline of the motor action for artificial hearts. © 2000 Scripta Technica, Electr Eng Jpn, 132(1): 73–80, 2000     

Control using joint torque sensor of robot arm with two‐inertia resonance: Comparison with control using state‐estimation observer

Most industrial robots are driven through reduction gears such as Harmonic Drives and RV gears. Due to the flexibility of the drive system, vibratory behavior occurs during operation. When flexibility is considered, the drive system of the robot joint can be modeled as a resonant mechanical system called a two‐inertia system. Conventionally, studies of two‐inertia system have discussed semiclosed‐loop control using only motor information and a state observer. On the other hand, joint torque sensing of robots has been studied in the harmonic drives that are widely used in robot joints. The joint torque sensor is becoming available with higher performance. In this paper, we consider the control of a robot arm having two‐inertia resonance by using the joint torque sensor. The performance of the torque sensor and that of the observer are compared. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 156(2): 75–84, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20226