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中南大学学报(自然科学版)

Journal of Central South University

第36卷    第4期    总第164期    2005年8月

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文章编号:1672-7207(2005)04-0626-05
纵-扭复合型超声马达共振频率调谐
易幼平,钟 掘

(中南大学机电工程学院,湖南长沙,410083)

摘 要: 将传统的复合型超声马达改进成双定子对称结构,提出一种通过在定子上附加一个调整环实现纵、扭振动同频共振的新方法。根据线性压电理论建立定子振动分析理论模型,研究定子的纵向振动与扭转振动第一阶固有频率随调整环质量和位置的变化规律,优化双定子复合型超声马达的几何结构参数。研究结果表明:调整环的质量对定子纵向振动与扭转振动的固有频率的影响程度相同,但调整环在定子上的位置对纵向振动的固有频率的影响程度有较大差异。当改变调整环在定子上的位置,纵向振动一阶固有频率的变化很小,但扭转振动一阶固有频率变化较大;调整环处于定子端部时,可以实现定子纵向振动与扭转振动一阶固有频率的调谐。

 

关键字: 超声马达;固有频率;扭转振动;纵向振动;调谐

Coincidence of resonance frequencies for longitudinal
and torsional composite type ultrasonic motor
YI You-ping, ZHONG Jue

School of Mechanical and Electrical Engineering,
 Central South University, Changsha 410083, China

Abstract:The traditional hybrid ultrasonic motor was improved to be a symmetrical structure with two stators. By means of adding an adjusting ring to the stator, a new method of eigenfrequencies degeneration of longitudinal and torsional vibrations was proposed. According to the linear piezoelectric theory, a theoretical model was established to analyze the vibrations of the stator. The changing law of the first eigenfrequencies of longitudinal and torsional vibrations following the mass and position of the adjusting ring was investigated. Furthermore, the structural parameters of the motor were optimized with the theoretical model. The results show that the mass of the adjusting ring has an identical influence on the eigenfrequencies of longitudinal and torsional vibrations, but the position of the adjusting ring has a great different influence on these eigenfrequencies. On the condition of changing the position of the adjusting ring, the first eigenfrequency of longitudinal vibration changes little, while the first eigenfrequency of torsional vibration changes greatly. When the adjusting ring is at the end of the stator, the first eigenfrequencies of longitudinal and torsional vibrations are of degeneration.

 

Key words: ultrasonic motor; eigenfrequency; longitudinal vibration; torsional vibration;
conincidence

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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