共查询到18条相似文献,搜索用时 125 毫秒
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面向超声电机定子的一体化与微型化需求,提出了一种基于钎焊与微电子机械系统(MEMS)工艺的微型超声电机定子。对超声电机的原理和结构进行分析,利用有限元法对定子的模态与谐响应进行了仿真。利用钎焊工艺将锆钛酸铅(PZT)压电陶瓷与金属弹性体进行连接,通过MEMS与机械加工工艺对定子的驱动足、上电极等进行制备。对超声电机定子焊接情况进行表征,对超声电机的振动性能与驱动性能进行测试。测试了PZT压电陶瓷与金属弹性体的结合强度,两者之间的抗剪切强度为33.46 MPa,观察了焊接截面形貌,可看出各焊接层厚度均匀,无裂缝、孔隙。搭建实验平台对定子的振动性能与驱动性能进行了测试,微型超声电机的定子的谐振频率为188.15与266.16 kHz,最大振幅为228 nm,在激励电压为30 V、预压力为350 mN时,微型超声电机的最大速度为38.22 mm/s。实验结果表明,该超声电机定子钎焊情况良好,驱动性能较高,具有广阔的应用前景。 相似文献
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本文给出了一种分析复合棒型超声马达固有频率的简便方法,并可在此基础上分析定子纵振动和扭转振动的位移分布。与有限元法和机电等效电路图法相比,此方法物理概念清晰,便于工程应用。为进一步研究超声马达提供了一个理论工具。 相似文献
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圆板型行波超声波马达的建模与仿真 总被引:1,自引:1,他引:0
简述了行波超声马达的基本原理,比较了定子复合圆板分析中有限元和经典振动理论两种方法的优缺点。并利用有限元方法分析了定子板在自由状态下的固有频率及固有振型,给出了分析结果。在此基础上,利用所得数据,对圆板行波超声马达工作原理及工作过程进行了计算机仿真 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1979,67(8):1171-1173
Cantilever multimorph structures using the piezoelectric polymer PVF2 exhibit large amplitude vibrational motion when driven with an ac voltage. The possibility seems attractive of using such simple solid-state structures for low-power, compact, and maintenance-less fans for ventilation or cooling applications, for example, in electronic equipment. 相似文献
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该文提出了一种新型的方孔定子行波超声电机,并进行了参数设计、仿真分析和实验研究。定子由1个方孔金属体和4块压电陶瓷片组成,通过与直径大于定子内边长的转子配合发生弹性变形,从而对转子产生预压力,便于驱动。利用有限元软件对定子进行模态分析,选择第三阶模态作为工作模态,得到定子最大振幅与激励频率、电压、壁厚、边长及圆角半径的关系,并研究了频率、电压及预压力对转子输出特性的影响。制作了实体样机并测试了其输出特性,测试表明,当电压为100 V、激励频率为31.5 kHz时,其空载转速为215 r/min,堵转力矩达到1.58 mN·m。 相似文献
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一种低频大行程直线型压电电机的研究 总被引:3,自引:1,他引:2
基于叠层式压电陶瓷在低频带范围内的变形幅值大,与驱动电压线性度好且基本不随驱动频率变化的特点,提出并研制了一种低频大行程直线型压电电机.与共振式压电电机相比,该电机在低频范围内输出速度与驱动频率的线性度好,可控性较好.对电机的工作机理进行了分析,同时利用有限元软件对电机的结构进行设计,并试制了原理样机.实验结果表明,电机可在100 Hz~2 kHz的频带工作,其速度在100 Hz~1 kHz的频带内基本和频率成正比,最大空载速度为60 mm/min. 相似文献
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Mojallali H. Amini R. Zamanabadi R.I. Jalali A.A. 《Mechatronics, IEEE/ASME Transactions on》2007,12(2):219-223
This paper presents an equivalent circuit model with complex numbers that describes the free stator model of traveling-wave ultrasonic motors. The mechanical, dielectric, and piezoelectric losses associated with the vibrator are considered by introducing the imaginary part to the equivalent circuit elements. The determination of the complex circuit elements is performed by using a new, simple iterative method. The presented method uses information about five points of the stator admittance measurements. The accuracy of the model in fitting to the experimental data is verified by using the measurements of a recently developed piezoelectric motor and a well-known USR60 相似文献
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《Mechatronics》2006,16(1):1-12
This paper first presents an equivalent circuit model of a new disc-type ultrasonic motor and discusses its applications in evaluation of the stator’s frequency characteristics. The equivalent circuit analysis is based on the principle of ultrasonic motor operations and is conducted from the viewpoint of the mechanic vibration of the piezoelectric ceramic disk. Furthermore, because drift of the piezostator characteristics will cause variation of the motor speed, a controller is thus necessary in order to produce a constant output speed. In this research, the speed control scheme is implemented by using current modulation, so the revolutional speed will be kept constant. Meanwhile, the frequency behaviour of the proposed motor and its consequences on speed control scheme are discussed. Finally, a 3-D mechanical element with an extra electrical degree of freedom is employed to simulate the dynamic vibration modes of the linear piezoelectric, mechanical and piezoelectro-mechanic behaviours of a metal disc structure embedded with a piezoelectric actuator. In piezoelectric finite element formulation, a discretized equation of motion is developed and solved by using the integration scheme to explain why an adaptive boundary condition, a simple support condition with three non-equal-triangular (120°–90°–150°) fixed points near the edge for the mechanical design of a new disc-type piezoelectric ultrasonic stator, is defined so that a lateral elliptical motion of the contact point between stator and rotor can be realized for driving the rotor. 相似文献