共查询到19条相似文献,搜索用时 156 毫秒
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卧板式直线超声电机的特性分析模型 总被引:2,自引:0,他引:2
直线超声电机摩擦接触特性对电机性能的影响很大,直线超声电机的摩擦驱动机理往往不同于旋转超声电机,无法应用旋转超声电机的接触模型对其进行分析。针对一款卧板式直线超声电机,基于弹性接触理论建立了其摩擦接触分析及特性预估模型。该模型考虑了施加预压力后定子工作状态的改变,以及定、动子相对滑动速度差对摩擦力的影响。利用所建立的模型,对卧板式直线超声电机的机械输出特性进行了仿真计算,并分析了定子振动特性、预压力、接触界面摩擦特性、施加预压力弹簧刚度特性、驱动频率等参数对电机机械特性的影响。制作了样机,并对样机的机械性能进行了测试。试验结果表明,所建立的模型对直线超声电机特性的估算是有效的,可以为直线超声电机的设计和特性分析提供参考。 相似文献
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《中国电机工程学报》2018,(22)
在动态边端效应的作用下,直线牵引电机参数会发生显著地变化,导致无速度传感器控制性能恶化。该文以中低速磁悬浮列车直线电机为研究对象,利用backstepping控制理论和MRAS相结合的速度辨识方案实现高性能直线电机无速度传感器矢量控制。首先,给出以定子电流、转子磁链为状态变量的直线电机状态空间模型;然后,在状态空间模型的基础上引入附加状态变量,改写直线电机状态方程;利用backstepping控制理论设计含有校正项的直线电机观测器模型,并以观测器模型作为可调模型,以电机实际模型作为参考模型,建立速度辨识的模型参考自适应系统,并采用李雅普洛夫稳定性理论得到速度辨识算法。最后,对该方案进行仿真及硬件在环测试,结果验证了该方案的可行性。 相似文献
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直线驻波型超声电机的接触分析和堵转推力模型 总被引:1,自引:0,他引:1
摩擦界面对超声电机的性能有至关重要的影响。文章针对一种基于面内振动的直线驻波超声电机,结合电机的工作振型,对电机的定、转子的接触过程进行了详尽的论述,建立了堵转情况下的最大输出力模型;并进行了仿真研究。通过仿真可以得出超声电机的堵转推力受定、转装配间隙的影响最大。在电机已完成制造的情况下。如要得到较大的堵转推力,可适当调整定转子的装配间隙。 相似文献
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国内外直线超声电机的研究现状及关键技术 总被引:1,自引:0,他引:1
分析了直线超声电机的优点,按时间顺序介绍了国内外直线超声电机的研究状况,并给出了一些典型的电机形式及其工作原理;提出了当今直线超声电机研究中存在的问题及需要加强研究的关键技术。 相似文献
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针对横向磁场直线开关磁阻电机(TFLSRM)的特殊结构,提出一种基于电机磁链模型的滑动模态观测器,用以估计直线电机的位置和速度。所提观测器无需附加任何机械部件,只需检测电机电压和电流即可估计出准确的位置和速度。运用此滑模观测器在直线电机运行工况下进行了仿真,结果证明采用这种方案能够准确估计出直线电机的实际位置和运行速度。 相似文献
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一种应用正态分布理论的直线超声电机精密定位控制方法 总被引:2,自引:0,他引:2
针对直线超声电机在精密驱动过程中存在较强的非线性、时变性及控制模型复杂等问题,提出了一种基于正态分布理论统计直线超声电机驱动电压与速度/位移关系的方法,结合模糊逻辑控制技术,实现了对直线超声电机精密定位控制。利用宏微驱动控制模式对超声电机驱动的平台进行大行程、高精度定位实验研究,实验结果表明采用所提方法,当行程为5 mm时,稳态误差小于5 nm,能抑制系统的超调,改善系统动态性能。同时,由于直线超声电机动态保持力非常大,使得系统具有良好的抗扰动能力。 相似文献
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提出了一款由双兰杰文振子组成的V型直线超声波电动机,该电机通过两个兰杰文振子的纵振和弯振,在定子驱动足上形成椭圆运动,从而驱动直线滑轨对外输出直线运动。该电机使用了阶梯型超声变幅杆,有效地放大了定子驱动足处的振幅。介绍了电机的结构和工作原理,然后介绍了使用有限元法优化定子的方法,最后对实验样机进行了输出特性测试。结果表明,该电机无负载的最大输出速度206 mm/s,电机的最大输出力为10.5N。 相似文献
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The ultrasonic motor has an excellent level of performance and many useful features, including high torque, low speed, compactness in size, and absence of electromagnetic interference. This motor has an especially large holding torque and a high response characteristic, making it ideal for use as a servomotor. The drive principle of the ultrasonic motor is, however, different from that of electromagnetic motors and its mathematical model has not been developed yet. Its speed characteristics, moreover, vary with the driving conditions. Consequently, it is difficult to control the ultrasonic motor while maintaining performance. In this paper, a position control scheme using adaptive control is proposed. The utility and validity of the proposed control scheme is tested in experiment. 相似文献
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Chan-Hee Choi Jul-Ki Seok 《Industry Applications, IEEE Transactions on》2007,43(5):1258-1265
This paper proposes an online compensation strategy for the unwanted disturbance voltage resulting from the zero- current clamping effect for high-frequency-signal-injection-based sensorless control schemes. We derive an analytical model that reveals intrinsic characteristics of the zero clamping effect for high- frequency signal injection. The model in this form is subsequently incorporated into the development of a specialized offline commissioning test to find motor inductances and a voltage distortion factor. From the sensitivity analysis of the effect on magnetic saturation, we confirm that the compensation error due to saturation has little negative impact on the proposed compensation method. The compensation result leads to an accurate position estimate in the zero-current clamping region. The proposed scheme does not rely on a complicated lookup table. Experiments demonstrate the superiority of the proposed method in suppressing the voltage distortions caused by the zero-current clamping effect. 相似文献
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Man-Soon Yoon Neamul Hayet Khansur Kyung-Sun Lee Young Min Park 《Journal of Electroceramics》2012,28(2-3):123-131
This paper presents original results obtained in the development of dome-shaped actuator for a linear motor application. The main structure of compact ultrasonic linear motor presented in this paper consists of three parts, which were an actuating part, a shaft and mobile element. The actuating part was fabricated by powder injection molding (PIM) process. The linear motion of new-type linear motor was operated by the principle of inertia displacement. The actuating part combined with clamping ceramic element can be realized by the central movement of dome-shaped piezoelectric actuator (DSPA), which has the maximum displacement of the up-and-down movement. The linear motor, where DSPA was 9.86?mm in diameter, 4.6?mm in curvature of radius and 0.4?mm in thickness, operated at 1st resonance frequency. The dynamic characteristics of the motor was investigated by finite element method (FEM) and compared with experimental results. These results were in good agreement with that predicted by simulations. 相似文献
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ABSTRACT Ultrasonic motor (USM) has an excellent performance and many useful features. Since this motor is superior in holding torque and high response characteristic, it has been expected to use as position servomotor for small motors. There have been reported some mathematical models of the ultrasonic motor. however, these models are too complex to apply for control of the motor. Therefore position controllers based on PI control or fuzzy control have been proposed in recent years. It is difficult to control the ultrasonic motor with high-performance using such controllers, thus simple and convenient mathematical model is necessary for precise control. This paper presents a new position control scheme of ultrasonic motor, it consists of a PI controller and an adaptive controller which compensates the speed characteristic variations with online parameter identification. Moreover, this system controls both driving frequency and phase difference in order to achieve a quick and precise position control. The effectiveness of proposed control.scheme is demonstrated by experiments. 相似文献
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探索了在微型直线超声波电动机中实现近似行波驱动的途径,研制了一种外形尺寸为39 mm×6 mm×12.7 mm的环状矩形振子近似行波型直线超声波电动机。结合电机振子的有限元模态分析,阐述了依靠激发空间相位差为90°的两个正交弯曲振动模态,实现行波在环状矩形振子上被激发和传播的电机运动原理。使用7块压电陶瓷片来分别激发振子的两个工作模态。在振子底部设计了梳齿状结构,以放大振幅。利用有限元法进行结构设计,使两个工作模态的频率简并。通过激光测振,证实了电机振子设计方案的有效性。通过对实际样机的驱动齿旋向测试,初步证实近似行波的形成及传播的存在。初步的样机特性实验表明:在频率为66 kHz和160 V峰峰电压激励下,电机最大速度为162.5 mm/s,最大预压力负载为8.5 N。该电机初步达到设计目标。 相似文献
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对超声波电动机使用PID控制方案时,首先要对系统的摩擦环节进行补偿,建立一个整体超声波电动机模型控制方案,然后再结合PID控制器进行控制。使用Z-N法得到了控制器的三个控制参数,实现基于LuGre摩擦模型的超声波电动机模型控制,通过仿真实验验证对比,证明了对超声波电动机摩擦补偿后使用PID控制算法的可行性和有效性。 相似文献