Evaluation of thermal stress of transducers for cryogenic ultrasonic motors

Author

Noguchi, Y. ; Yamaguchi, Daisuke ; Kanda, Takefumi ; Suzumori, Koichi

Author_Institution

Grad. Sch. of Natural Sci. & Technol., Okayama Univ., Okayama, Japan

fYear

2014

fDate

3-6 Sept. 2014

Firstpage

2506

Lastpage

2509

Abstract

An ultrasonic motor which can be driven at the condition from room temperature to cryogenic temperature has been designed, fabricated and evaluated. This motor has a bolt-clamped Langevin-type transducer which is suitable for cryogenic temperature. The aim of this paper is to evaluate the thermal stress of transducers. Each transducer is made of materials which had different thermal expansion coefficient, such as stainless, Ti, or invar. The thermal stress in the transducer made of Ti was the smallest. The rotation speed of the motor using the transducer made of Ti was evaluated at cryogenic temperature. The rotation speed was 1102 rpm at 4.6 K when the applied voltage was 100 V_p-p.

Keywords

cryogenics; thermal expansion; ultrasonic motors; ultrasonic transducers; bolt clamped Langevin type transducer; cryogenic ultrasonic motors; temperature 4.6 K; thermal expansion coefficient; thermal stress evaluation; transducers; Heating; Piezoelectric polarization; RNA; Stress; Thermal expansion; Transducers; Actuator; Cryogenic Temperature; Piezoelectric transducer; Ultrasonic Motor;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2014 IEEE International

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.2014.0625

Filename

6932011