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Ultrasonic Driven Motor

IP.com Disclosure Number: IPCOM000080436D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Barth, HV: AUTHOR

Abstract

In Fig. 1 is shown a motor cutaway to reveal its rotor 10 and ultrasonic driving members. The driving members are horns 12 and 14 actuated, respectively, by ultrasonic actuators 13 and 15. Rotor 10 is driven by ultrasonically vibrating horn 12 or 14, causing the rotor 10 to rotate on shaft 16.

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Ultrasonic Driven Motor

In Fig. 1 is shown a motor cutaway to reveal its rotor 10 and ultrasonic driving members. The driving members are horns 12 and 14 actuated, respectively, by ultrasonic actuators 13 and 15. Rotor 10 is driven by ultrasonically vibrating horn 12 or 14, causing the rotor 10 to rotate on shaft 16.

To drive the rotor 10 clockwise, actuator 13 vibrates to reciprocate horn 12 toward the periphery of rotor 10. To rotate counterclockwise, actuator 13 is deactivated and actuator 15 is activated to reciprocate horn 14. The rotor 10 may be driven continuously or as a stepping motor, by controlling the number of cycles that either actuator 13 or 15 are electrically excited by. To precisely stop the rotor, an electromagnetic brake 17 is provided.

The interface between the ends of the horns 12 or 14 and the periphery of the rotor 10 is shown in Figs. 2 and 3. In Fig. 2 the periphery of the rotor and the surface of the horn have a staircase configuration. When the horn reciprocates at high frequency against the rotor, the rotor is driven. In Fig. 3 the surface of the horn and the periphery of the rotor are merely roughened. In another configuration, the horn might be a rough surface while the rotor surface has a resilient coating such as hard rubber. All that is required is sufficient frictional contact for the horn as it reciprocates and contacts the rotor, to impart rotary motion to the rotor.

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