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An Ultrasonic Motor for Use at Ultralow Temperature Using Lead Magnesium Niobate–Lead Titanate Single Crystal

2012; Institute of Physics; Volume: 51; Issue: 7S Linguagem: Inglês

10.1143/jjap.51.07ge09

1347-4065

Daisuke Yamaguchi, Takefumi Kanda, Koichi Suzumori, Masataka Kuroda, Dai Takeda,

Soft Robotics and Applications

In this study, an ultrasonic motor for use at ultralow temperatures has been fabricated and evaluated. The motor has a bolt-clamped Langevin-type transducer using lead magnesium niobate–lead titanate (PMN–PT) single crystal. The transducer is proposed as an oscillator for use at ultralow temperatures by simulation of the thermal stress and evaluation of the pre-load. The thermal effect of the transducer was evaluated when the temperature was changed. As a result, the pre-load of the transducer was concluded to be affected by thermal stress. In addition, the ultrasonic motor using the transducer was fabricated and evaluated. By adjusting the contact pre-load between the rotor and the transducer, the motor has successfully rotated at an ultralow temperature. The rotation speed was 144 rpm at 4.4 K when the applied voltage was 150 V p–p . This rotation speed is larger than that of previous same size actuators that can be used at ultralow temperatures.