In a previous research, the authors have presented and developed a cylindrical type ultrasonic motor using longitudinal vibration transducers. Four uniform longitudinal vibration transducers are adopted in this motor to excite a bending vibration traveling wave in a cylinder with teeth. The simulation and experiment results of this motor indicate that the vibration state of the transducer is not single longitudinal vibration, but longitudinal and bending coupled vibration. This study focuses the research on the vibration state of the transducer in the previous motor. Firstly, the reason for the bending vibration of the transducer is given. Then, the effect of the coupling bending vibration on the electromechanical coupling factor of the motor and the distortion of traveling wave are studied. The study results state that the coupling bending vibration of the transducer can make the resonance frequency of the stator deviate from the resonance of the transducer and cause a distortion of traveling wave in the cylinder. Finally, new mode to excite the radial bending vibration of a cylinder by using the bending vibration of a transducer is presented.%以纵振夹心换能器式圆筒型超声电机为研究对象,对换能器的振动状态进行了分析,给出了换能器弯曲振动的产生原因；研究了耦生弯振对电机机电耦合系数以及圆筒中弯振行波质量所带来的影响,耦生弯振的存在使得定子模态特征频率偏离换能器谐振频率,并使得定子圆筒中的弯振行波产生了畸变.最后,提出一种采用换能器弯振激励圆筒径向弯振的模态组合方式.
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