An Ultrasonic Motor Using a Titanium Transducer for a Cryogenic Environment

We have fabricated an ultrasonic motor using a titanium transducer. This motor is for driving in the cryogenic temperature condition with a highly intense magnetic field. Titanium has low magnetic permeability and a thermal expansion coefficient close to that of lead zirconate titanate (PZT). These...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 52; no. 7; pp. 07HE13 - 07HE13-6
Main Authors Takeda, Dai, Yamaguchi, Daisuke, Kanda, Takefumi, Suzumori, Koichi, Noguchi, Yuya
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.07.2013
Subjects
Driving conditions
Lead zirconate titanates
Magnetic fields
Motors
Thermal expansion
Thermal stresses
Titanium
Transducers
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Summary:We have fabricated an ultrasonic motor using a titanium transducer. This motor is for driving in the cryogenic temperature condition with a highly intense magnetic field. Titanium has low magnetic permeability and a thermal expansion coefficient close to that of lead zirconate titanate (PZT). These features mean that a transducer made of titanium has good properties for use in such an environment. We have fabricated and evaluated the ultrasonic motor in a cryogenic environment and an intense magnetic field. We have simulated the thermal stress applied to PZT in consideration of nonlinear material properties in the cryogenic environment. The thermal stress of the titanium transducer is smaller than that of the SUS304 transducer. Moreover, we have achieved driving of the ultrasonic motor at 4.5 K. Additionally, we have confirmed that there is little effect of the intense magnetic field on the driving of the motor.
Bibliography:(Color online) Structure of the ultrasonic motor. (Color online) Parts of the ultrasonic motor. (Color online) Structure of the transducer. (Color online) Parts of the transducer. (Color online) Simulation result by modal analysis. (Color online) Relationship between temperature and Young's modulus. (Color online) Relationship between temperature and the thermal expansion coefficients of PZT, SUS304, and titanium. (Color online) (a) Simulation result of the transducer with changing temperature from 300 to 4.5 K. (b) Cross-sectional view of PZT and simulation result of the thermal stress. (Color online) Relationship between temperature and thermal stress obtained by FEM. (Color online) Relationship between frequency and admittance at 4.5 K. (Color online) Relationship between clamping torque and admittance at each temperature. (Color online) Comparison of calculated and experimental values of optimum clamping torque of titanium and SUS304 transducers. (Color online) Evaluation system of the cryogenic ultrasonic motor: (a) rotation speed measurement system and (b) experimental setup for cryogenic environment. (Color online) Relationship between temperature, rotation speed, and starting torque in a cryogenic environment when the voltage and clamping torque are 100 V and 0.5 N m, respectively. (Color online) Relationship between magnetic flux density and amount of change relative to admittance of 0 T. Relationship between magnetic flux density and rotation speed when the voltage is 100 V at 300 K.
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ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.07HE13