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A traveling-wave ultrasonic motor utilizing a ring-shaped alumina/PZT vibrator

机译：利用环形氧化铝/ PZT振动器的行进式超声波电机

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摘要

Considering that high Young?s moduli and low ultrasonic attenuation of fine ceramics may enhance driving force and reduce energy dissipation, in this study, we exploit the usage of fine ceramics as vibrating bodies of ultrasonic motors. Several alumina vibrating bodies were fabricated and bonded to annular lead-zirconate-titanate (PZT) disks to form ring-shaped vibrators, where traveling waves with the 3rd bending modes were excited to frictionally drive the rotor. First, we explored the fundamental vibration properties. As predicted, the alumina/PZT vibrators provided relatively high force factors, high electromechanical coupling factors, and low damping compared to the stainless-steel/PZT one with similar structure. Subsequently, through experimental assessment on load characteristics, we found that the rotation speed of the alumina/PZT motor at 20 V was larger than that of the stainless-steel/PZT motor at 250 V, and meanwhile, it exhibited superior maximal-torque-to-voltage and maximal-output-power-to-voltage ratios; these results imply that satisfactory performance is achievable with our motor. Besides, alumina?s chemical resistance and electrical resistance make our motor potentially applicable to the acid/alkaline atmosphere and the intensively alternating-current magnetic field.
机译：考虑到较高的年轻的陶瓷和低超声衰减的精细陶瓷可能会增强驱动力并减少能量耗散，在这项研究中，我们利用了细陶瓷作为超声波电动机的振动体的用法。制造几个氧化铝振动体并粘合到环形铅 - 锆酸盐 - 钛酸盐（PZT）盘上以形成环形振动器，其中激发具有第3弯曲模式的行进波以摩擦驱动转子。首先，我们探讨了基本振动特性。如预测，氧化铝/ PZT振动器提供了相对高的力因子，高机电耦合因子和与具有类似结构类似的不锈钢/ PZT的振动件和低阻尼。随后，通过对负载特性的实验评估，我们发现20V的氧化铝/ PZT电机的转速大于250 V的不锈钢/ PZT电机，同时，它表现出优越的最大扭矩 - 到电压和最大输出 - 电源到电压比;这些结果意味着我们的电机可实现令人满意的性能。此外，氧化铝的耐化学性和电阻使我们的电机可能适用于酸/碱性气氛和强烈的交流磁场。

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