An Ultrasonic Motor for Use at Ultralow Temperature Using Lead Magnesium Niobate--Lead Titanate Single Crystal
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 temperatu...
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| Published in | Japanese Journal of Applied Physics Vol. 51; no. 7; pp. 07GE09 - 07GE09-6 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
The Japan Society of Applied Physics
01.07.2012
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| Online Access | Get full text |
| ISSN | 0021-4922 1347-4065 |
| DOI | 10.1143/JJAP.51.07GE09 |
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| Summary: | 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 . This rotation speed is larger than that of previous same size actuators that can be used at ultralow temperatures. |
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| Bibliography: | Specimens made of PMN--PT single crystal and PZT ceramic. Experimental setup for investigating piezoelectric material specimens in ultralow-temperature environment. Relationship between admittance and temperature of specimens. Structure of bolt-clamped Langevin-type transducer: (a) component parts and (b) assembled transducer. Result of modal analysis of transducer by FEM analysis. Result of thermal structural analysis when temperature was reduced from 300 to 4.2 K: (a) overall view and (b) cross-sectional view of piezoelectric material. Bolt-clamped Langevin-type transducer for use in cryogenic environments: (a) component parts of transducer and (b) fabricated transducer. Relationship between admittance and clamping torque of transducer when temperature was 298 K. Relationship between vibration velocity of transducer and driving frequency at room temperature. Photograph and cross sectional view of cryogenic actuator evaluation system: (a) overview and (b) tip of insert system. Relationship between admittance, phase, and frequency at 4.4 K. Relationship between the optimum clamping torque and temperature. Relationship between admittance of transducer and temperature when clamping torque was 0.6 N m. Structure of ultrasonic motor for use at cryogenic temperatures. Fabricated ultrasonic motor for use at cryogenic temperatures: (a) component parts and (b) fabricated motor. Photograph of motor mounted on insert system. Relationship between lowest temperature of rotation and contact pre-load. Comparison of relationship between rotation speed and temperature when PMN--PT transducer and PZT transducer were used. |
| ISSN: | 0021-4922 1347-4065 |
| DOI: | 10.1143/JJAP.51.07GE09 |