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，由于润滑油或高预紧力的存在，弯曲振动很容易被抑制，导致电机性能不佳。我还研究了润滑油粘度对电机性能的影响。使用不同粘度的润滑油时，电机效率没有明显差异，这表明即使在低静预载荷下，也没有发生流体动力润滑。结果证明，润滑后的超声电机可以在很宽的温度范围内工作，因为润滑油粘度对电机性能的影响不大。

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.