[Case Study] Frequency Response Analysis of Traveling Wave Ultrasonic Motors

Confirmation of the traveling wave behavior of disk-type and ring-type traveling wave ultrasonic motors and the elliptical trajectory of an arbitrary point on the vibrating body.

**Case Summary** ■Product Name: NX Nastran ■Analysis: Frequency Response Analysis ■Industry: Electrical and Electronics Ultrasonic motors are actuators that generate ultrasonic vibrations in the stator through piezoelectric elements, driving the rotor via friction. They feature low-speed, high-torque operation without gears, fast response, high holding torque, quietness, and non-magnetic properties. Practical applications are being advanced in various fields such as optical devices, precision instruments, information equipment, medical devices, and transportation equipment. In this analysis, two bending vibrations with a 90° phase difference were excited in the stator of disk-type and ring-type traveling wave ultrasonic motors, and the behavior of the traveling wave and the elliptical trajectory of arbitrary points on the vibrating body were confirmed. *Note: Since Nastran does not have piezoelectric analysis capabilities, excitation was performed using force loading instead of voltage drive.* □ For other functions and details, please refer to the catalog.

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