The purpose of this research is to increase the torque performance of sandwich-type multi-degree-of-freedom(MDOF) spherical ultrasonic motor(SUSM) by a torque composition. In this report, three kinds of SUSM with different contact surface are manufactured as a trial, the performances among three motors are drawn a comparison, and the actual contact area of spherical contact surface between the stator vibrator and the spherical rotor is studied in experiments. As a result, it was confirmed that the spherical contact surface is an important factor which results in the achievement of high torque, and by whittling away the non-effective contact surfaces, motor obtained the stablest working performance.
サンドウィッチ型多自由度球面超音波モータ（第2報）接触面形状の検討
symjspe2010S_449_2010.pdf
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