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三棱柱形直线超声电机

DOI: 10.13334/j.0258-8013.pcsee.2014.36.015, PP. 6493-6498

Keywords: 直线超声电机,驱动机制,振动模态,机械特性,振动特性

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Abstract:

提出一款三棱柱形直线超声电机。电机定子为由二片压电陶瓷片黏接在三棱柱结构的弹性体上构成。每片压电陶瓷片产生的空间激励力都与两个工作模态的振动方向有一夹角,单片陶瓷片即能激励出两个工作振动模态,而且两者振动响应存在一个相位差。研究了电机定子驱动机制模型,推导了电机单相、两相激励时驱动质点的运动轨迹,分析了电机单相、两相驱动原理。对制作样机的机械性能进行了测试,试验表明电机可在较宽的频率范围内平稳运行,当驱动电压峰峰值为250V时,该电机单相、两相驱动的最大速度分别为2.2、2.5mm/s,最大输出力分别为0.156、0.192N,是定子质量的8.6倍、10.6倍。

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