潤滑剤の機能性を利用した超音波モータの効率・寿命改善

对行波型超声波电机的润滑效果进行了研究。我发现，在润滑接触下的电机性能，包括效率、速度和扭矩，都低于干接触。进一步的研究表明，润滑油或高预紧力的存在极易抑制弯曲振动，导致电机性能不佳。使用不同粘度的润滑油时，电机效率没有明显差异，说明即使在低静态预紧力下也不会发生流体动力润滑。结果表明，由于润滑剂粘度对电机性能影响不大，因此润滑型超声波电机可以在较宽的温度范围内工作。

I investigated the lubricating effect in traveling-wave type ultrasonic motors. I found that the motor performance in lubricated contact, including efficiency, speed, and torque, was lower than that in dry contact. Further studies showed that bending vibration is easily damped by the presence of lubricant or high preload, resulting in poor motor performance.I also studied the effect of lubricant viscosity on motor performance. No distinct difference on motor efficiency can be found when the lubricants with different viscosities were used, which indicates that hydrodynamic lubrication did not occur even under low static preload. The results prove that lubricated ultrasonic motors can work in a wide temperature range, because motor performance is not greatly affected by lubricant viscosity.