共查询到18条相似文献,搜索用时 171 毫秒
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本文在回顾电机中的洛伦兹力和麦克斯韦力基础上,通过介绍无轴承电机基本结构,径向悬浮力产生机理和悬浮力系统的运动方程等来讲解无轴承电机的径向悬浮力,并且介绍了教学过程中的实践经验。通过采用本文的讲解方法,学生易于理解和掌握无轴承电机的结构和径向悬浮力产生原理。 相似文献
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无轴承无刷直流电机集成了直流和交流电机的优点,具有重要的实际应用价值,针对传统悬浮力控制方法存在工作复杂、逆变器通断频繁等缺陷,为了提高磁悬浮力的控制效果,提出了基于有限元分析的无轴承无刷直流电机悬浮力控制策略。首先对无轴承无刷直流电机的结构以及悬浮力产生的原理进行了分析,然后采用有限元分析法对电机转矩和悬浮力进行计算,从而实现无轴承无刷直流电机控制,最后采用Matlab/Simulink工具对其性能进行测试与验证。结果表明,本文策略可以提高转子悬浮的稳定性,能够保证无轴承无刷直流电机的正常运行。 相似文献
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磁悬浮径向轴承的三维有限元分析 总被引:1,自引:0,他引:1
应用ANSYS 10.0软件对磁悬浮径向轴承进行三维有限元仿真与计算分析,得出磁悬浮径向轴承磁力线、磁感应强度和电磁力在轴承中的分布.最后根据磁轴承线圈的两种绕线方式分析其磁场,并据此分析径向磁力轴承的几个特点,为径向磁悬浮轴承的优化和控制系统的设计提供了一定的依据. 相似文献
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周国安 《电子工业专用设备》2013,(6):9-12,20
从整体结构及硬件设计方面介绍了小批量生产及隔膜泵系统,分析隔膜泵的工作原理,循环机理及硬件控制和驱动电路,同时指出在湿度较大的生产厂里面产生的漂移及解决措施;从整体结构分析集中式抛光液供给系统,分析其抛光液混合中心具备的温度控制、无轴承磁悬浮泵工作机理及循环机制;对比隔膜泵与无轴承磁悬浮泵对颗粒凝聚的影响,并分析这种系统适用范围。 相似文献
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介绍凸极转子无轴承同步磁阻电机的结构优点和应用领域,简述无轴承同步磁阻电机的转子悬浮原理,分析研究无轴承同步磁阻电机中的麦克斯韦力和洛伦兹力,最后总结无轴承同步磁阻电机关键技术的发展趋势。. 相似文献
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Zebin Yang Qifeng Ding Jialei Ji Qian Zhao 《International Journal of Electronics》2013,100(12):1829-1844
The traditional squirrel-type bearingless induction motor (BIM) suspension winding generates induced current in its squirrel-cage rotor and affects the phase and amplitude of the suspension force. Based on the analysis of the spatial distribution of torque winding magnetic field and suspension winding magnetic field, a new type of wound rotor BIM is designed. Different from the squirrel-cage rotor, the wound rotor uses a special method of embedding a set of coils at any symmetrical four rotor slot positions, so as to only induce the torque winding magnetic field. The induced current, air-gap magnetic density, magnetic field line distribution, suspension force as well as electromagnetic torque of the traditional squirrel-cage motor and the new wound motor are analysed by Maxwell finite element calculation. The results show that the designed new wound BIM can not only effectively suppress the induced current of suspension winding, eliminating its influence on the suspension force, but also has a better starting performance. 相似文献
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《Mechatronics》2017
This paper presents the design, modeling, control, and experimental results for a one-axis magnetically suspended reaction sphere (1D-MSRS) driven by a hysteresis motor. The goal of this work is twofold: (a) to conduct a preliminary study for magnetically suspended reaction sphere for three-axis spacecraft attitude control, and (b) study the potential of hysteresis motors for the reaction wheel/sphere drives. The 1D-MSRS uses a hysteresis motor with a spherical rotor made of solid steel. The rotor sphere is magnetically suspended in all translational directions, and is driven about the vertical axis by a bearingless hysteresis motor. We present the modeling and control of the magnetic suspension of the bearingless motor in the 1D-MSRS, and the hysteresis motor dynamics are analyzed by a hysteresis motor equivalent circuit model. The 1D-MSRS system has experimentally demonstrated a starting torque of 8.9 mNm under 0.7 A peak sinusoidal excitation current. With this excitation the sphere can run up to 12,000 rpm synchronously in the presence of air drag. This study demonstrates that the hysteresis motor has strong potential for use in high-speed, low-vibration reaction wheels. 相似文献
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Aihara T. Toba A. Yanase T. Mashimo A. Endo K. 《Power Electronics, IEEE Transactions on》1999,14(1):202-208
A position and speed sensorless control using the counter electromotive force of a permanent-magnet motor (PM) debases the control performance at a low speed. We propose a controllable system at full speed, including a zero speed using saliency. At low speed, the sensorless control is made by observing a current ripple at a time when alternating voltage has been applied to a salient-pole motor. Also, for discriminating the S and N poles of the magnet, magnetic saturation is used. A device has been applied to the motor rotor to allow the magnetic saturation to come about easily. Furthermore, at a time of high speed, drive at a full-speed range has been accomplished by switching smoothly over to a sensorless driving system making use of counter electromotive force. All algorithms are implemented by software, and this system can operate successively from starting to high-speed operation. The paper discusses the operational principles at a low speed, analysis and experimental results, the control scheme, how to changeover the control mode at high speed, and the experimental results 相似文献
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《Mechatronics》2022
To address the problem of speed and flux observation in sensorless control of a bearingless induction motor under the influence of parameter changes and external disturbances, a speed sensorless control strategy combining radial basis function (radial basis function, RBF) neural network and fractional sliding mode is proposed. According to the current error, fractional sliding mode control rate is designed to reduce the speed-observed chatter of the bearingless induction motor and its adverse effect on the rotor suspension stability. Then, combined with the theory of RBF neural network, the new optimal control rate is obtained by using its approximation ability. At the same time, the stability of two control rate is proved. Thus, the flux linkage and speed under normal operation, parameter change and external disturbance are observed and the new speed sensorless control is realized. The simulation and experimental results show that the proposed joint RBF neural network approximation algorithm and fractional sliding mode speed sensorless control system of the bearingless induction motor can not only effectively identify the flux and speed under three conditions of no-load, load disturbance and speed change, but also ensure the good suspension of the motor rotor in the x-axis and y-axis directions. 相似文献
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Theoretical analyses are carried out on a magnetic suspension and a linear synchronous motor, both utilizing superconducting magnets. The derived theory is applied to the studies of the high-speed train models. In the suspension system investigated here, the roadbed is equipped with normal conducting coils. The magnetic lift force is found to be pulsating, and a design criterion for eliminating the pulsation components in the lift force is derived. An improved suspension system is proposed, which consists of a "ladder-type conductor" in the roadbed. This new system is investigated theoretically. An end effect of the suspension system is also studied. In the linear synchronous motor, the methods of minimizing reaction forces are derived. The combined magnetic suspension and propulsion system is analyzed. It is found that the influence of the track loops for the suspension on the linear synchronous motor is not very significant. 相似文献
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《Mechatronics, IEEE/ASME Transactions on》2010,15(1):40-47
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《Vehicular Technology, IEEE Transactions on》1980,29(1):71-80
The notion of using the magnetic attractive force of a single-sided linear induction motor (SLIM) for suspension of a vehicle has recently received some attention. There is, therefore, some interest in determining how such a combined suspension/propulsion system would compare to separate lift and propulsion. Weight requirements of transverse flux dc lift magnets are calculated as a function of vehicle weight and magnet length. A three-phase longitudinal flux linear motor/suspension system is designed which has the same values of maximum flux and current density as the dc magnet. The effect of pole pitch on the weight of this motor is shown. Comparisons are made between this combined system and a system using the dc magnets plus a separate linear motor. 相似文献
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Performances of bearingless and sensorless induction motor drive based on mutual inductances and rotor displacements estimation 总被引:3,自引:0,他引:3
Tera T. Yamauchi Y. Chiba A. Fukao T. Rahman M.A. 《Industrial Electronics, IEEE Transactions on》2006,53(1):187-194
A self-sensing bearingless motor is considered as an effective solution to reduce cost and shorten a shaft length. In this paper, a novel estimation method of a rotor displacement is proposed. The method is based on the detection of currents induced by mutual inductances, which vary as a function of the rotor displacements. A high-frequency carrier voltage is superimposed on a motor main terminal voltage. The induced carrier-frequency current component is distinguished from the suspension-winding current. The carrier signal is selected high enough to suspension-current components. However, the carrier current is disturbed in transient conditions. The disturbed current results in a vibration of the estimated rotor displacements. A suspension-current estimator is proposed to reduce this vibration and to obtain the difference between the detected current and the estimated current. As a result, the disturbance vibration is significantly reduced. It is shown that a successful magnetic suspension is realized with the proposed method. 相似文献