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首页> 外文会议>Proceedings of 4th International Workshop on Piezoelectric Materials and Applications in Actuators >Modal frequency modification of an ultrasonic motor stator
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Modal frequency modification of an ultrasonic motor stator

机译：超声波电机定子的模态频率修改

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The stator of a rod shape ultrasonic motor using bending modes is axially symmetrical as a whole,and has degeneracy in which two transverse bending vibration modes have the same shape and same modal frequency.In reality,due to influence of heterogeneous materials,irregular clamping pressure of screws,or a machining error,the modal frequencies of natural modes of two phases don't coincide with each other.In this study,it is verified from theory that when the stator has different modal frequencies of two phases,the motor will have an unstable rotary speed.Moreover,motor efficiency is also decreased.To make the modal frequencies of two phases coincide with each other,this paper presents a modification technique for the rod shape ultrasonic motor stator.According to the structural perturbation theory,a recess portion is formed in a predetermined portion of the stator,or an appropriate mass is added thereto so as to change the modal frequencies of the stator.The modal frequencies of an updated stator are calculatdby solving dynamic equations.The adjustment position is located on basis of the modal analysis of the stator using FE software.A stator of rod shape ultrasonic motor is fabricated.The difference of modal frequencies of two phases is 1.86 kHz.After chamfered portions have been formed above the circumferential groove of the stator,the modal frequencies of two phases perfectly coincided with each other,and the degeneracy of the stator modes is realized.The modification technique presented in this study allows one to adjust the modal frequencies of the stator in an assembled state.As a result,a motor can be manufactured at low cost and motor performances can be improved.
机译：使用弯曲模式的棒形超声波电动机的定子整体上是轴向对称的，并且具有简并性，即两个横向弯曲振动模式具有相同的形状和相同的模态频率。实际上，由于异质材料的影响，夹持压力不规则由于螺钉的数量或加工误差，两相固有模态的频率不一致。在本研究中，从理论上验证了当定子的两相固有模态频率不同时，电动机将具有为了使两相的模态频率彼此重合，本文提出了一种棒形超声电机定子的改进技术。根据结构摄动理论，凹入部分在定子的预定部分中形成定子，或者向定子中添加适当的质量以改变定子的模态频率。通过求解动力学方程计算出定子，根据定子的模态分析采用FE软件确定调整位置，制作了棒状超声电机定子，两相模态频率之差为1.86kHz，倒角后在定子的圆周槽上方形成两个部分，两相的模态频率彼此完全重合，并且实现了定子模态的简并性。本研究提出的修改技术允许调节定子的模态频率。因此，可以以低成本制造电动机，并且可以改善电动机性能。

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