1996 Fiscal Year Final Research Report Summary
Improvements in the output power and accuracy of an ultrasonic stepping motor
| Project/Area Number |
07650061
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAKAMURA Kentaro Tokyo Institute of Technology, Precision and Intelligence Laboratory, Associate Professor, 精密工学研究所, 助教授 (20242315)
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| Co-Investigator(Kenkyū-buntansha) |
ISHII Takaaki Tokyo Institute of Technology, Precision and Intelligence Laboratory, Research A, 精密工学研究所, 助手 (40262323)
UEHA Sadayuki Tokyo Institute of Technology, Precision and Intelligence Laboratory, Professor, 精密工学研究所, 教授 (90016551)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Stepping Motor / Ultrasonic Motor / Standing Wave / Nodal Circle / Positioning / Linear Motor |
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| Research Abstract |
This study was focused on the improvements of an ultrasonic stepping motor for its practical use. In this motor, a stepping motion is realized by shifting spatially the standing vibrations of a ring/disk stator.
1) To support the stator firmly, a bending vibration mode of a disk with a nodal circle was introduced. An appropriate stator configuration was designed by Finite-Element-Method and made. We succeeded in fix the stator without reduction in vibration characteristics.
2) An experimental investigation on the contact mechanism at the rotor/stator interface revealed that the accuracy of step position becomes high when the width of contact region is designed at a quarter wavelength of the stator vibration.
3) A motor with 4.5 degree-step was designed and made being based on these new knowledge.
4) A high speed operation algorithm for accurate positioning was developed, where a large step high spped coarse positioning and a small step fine positioning were used complementarily.
It was clarified that the accuracy of the electrode pattern and the dimensions of the stator should be improved for much higher precision. A design for higher vibration amplitude is also important for larger mechanical output
5) A principle of linear stepping motor was also proposed. A reversible stepping motion of 10 steps for 50 mm span was realized by exciting several bending vibration of a bar with different order.
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