【作者】 刘浩；

【导师】 刘建芳；

【作者基本信息】 吉林大学 ， 机械工程（专业学位）， 2020， 硕士

【摘要】 随着消费类电子产品和虚拟现实技术(VR技术)的快速发展,人们对消费类电子产品中的触觉体验要求也在提升。手机是世界上应用最为广泛的电子产品,目前手机常用的振动马达为LRA线性振动马达,它使用电磁驱动线圈作为驱动源来驱动手机振动。压电驱动与电磁驱动相比不会产生电磁干扰,在小体积下即可产生较大的驱动力,因此可以使手机振动马达的体验性能提升一个台阶。本文依据压电驱动的特点,制作了两种类型的压电驱动手机振动马达。首先对现有的ERM偏心振动马达和LRA线性振动马达进行分析,将其分为了竖直方向振动和水平方向振动两种形式;同时得到了其尺寸要求:高度小于4mm,体积越小越好;功能要求:工作频率为180—250Hz、驱动手机达到的最大加速度越大,响应时间越快,性能越优。然后,从压电振子的常用结构中选用了两端固置式压电振子和改进悬臂梁结构压电振子作为竖直方向振动压电马达和水平方向振动马达的驱动源,根据静力学分析和动力学分析得到了各部分尺寸对固有频率和驱动力的影响。其次,使用ANSYS Mechanical APDL有限元仿真分析软件,对在初选尺寸下的两种结构进行模态仿真、谐响应仿真和瞬态动力学仿真,分别得到了振动马达的固有频率、驱动模拟手机平台的谐振振幅、瞬态驱动振幅和驱动加速度以及响应时间。根据理论分析,对两种压电振动马达的初始尺寸进行了优化,并选择了两种试验样机的各部分尺寸;通过对比,发现竖直方向振动马达在尺寸和和性能方面更优异。然后,对竖直振动马达制作了实验样机,同时搭建了固有频率测试平台、振幅测试平台以及驱动100g工作台加速度测试平台,并进行了实验。实验结果表明,本文制作的竖直方向振动马达在高度为3.5mm,体积为490mm~3,系统固有频率f=249.05Hz,在50V矩形波电压驱动下驱动100g的模拟手机工作台产生的加速度为17.15m/s~2,响应时间为67.18ms。该马达与苹果公司最新技术—Tapic Engine马达相比,在性能基本不变的条件下体积减小26.16%。更多还原

【Abstract】 With the rapid development of consμmer electronics and virtual reality(VR)technology,people’s demand for tactile experience in consμmer electronics is also increasing.Mobile phones are the most widely used electronic products in the world.Currently,the commonly used vibrating motor of mobile phones is LRA linear vibrating motor,which used electromagnetic drive coil as the driving source to drive mobile phone vibration.Compared with electromagnetic drive,piezoelectric drive does not produce electromagnetic interference,and it can generate a large driving force in a small volμme,so the experience performance of mobile phone vibrating motor can be improved by a step.In this paper,according to the characteristics of piezoelectric drive,two kinds of mobile phone vibration motors are made.Firstly,the existing ERM eccentric vibration motor and LRA linear vibration motor are analyzed and divided into two forms:vertical vibration and horizontal vibration.At the same time,the size requirements are obtained:the height is less than 4mm;Functional requirements:the operating frequency is 180-250Hz,the maximμm acceleration reached by driving the phone and the fastest corresponding time.Then,the piezoelectric vibrators with fixed ends and the improved cantilever structure are selected from the common structures of the piezoelectric vibrators as the driving sources of the vertical and horizontal vibrating piezoelectric motors.Secondly,ANSYS Mechanical APDL finite element simulation and analysis software was used to conduct modal simulation,harmonic response simulation and transient dynamics simulation for the two structures under the primary size,and the natural frequency of the vibrating motor,resonance amplitude of the driving simulated mobile phone platform,transient drive amplitude and driving acceleration and response time were obtained respectively.According to the theoretical analysis,the initial size of two kinds of piezoelectric vibration motors is optimized,and the size of each part of two kinds of test prototype is selected.Through comparison,it is found that the vertical vibration motor is superior in size and performance.Then,the experimental prototype of the vertical vibration motor was made,and the natural frequency test platform,amplitude test platform and driving simulated mobile phone acceleration test platform were built,and the experimental test was carried out.According to the experimental results,the vertical vibration of piezoelectric motor in height is 3.5 mm,the volμme of 490 mm~3,working in the frequency of f=249.05 Hz,which drive analog phones workbench of 100g and produced by the acceleration of 17.15 m/s~2,response time of 67.18 ms under the rectangular wave voltage 50V driver.The motor is 26.16 percent smaller than apple’s latest technology—the Tapic Engine.更多还原