Examination of Hemispherical Shell Stator for Lightweight Spherical Ultrasonic Motor
Kento Goda, Hidekazu Kajiwara, and Manabu Aoyagi
Graduate School of Engineering, Muroran Institute of Technology
27-1 Mizumoto, Muroran, Hokkaido 050-8585, Japan
A multi-degree-of-freedom, spherical ultrasonic motor (MDOF-SUSM) has been proposed to reduce the size and weight of actuator systems capable of MDOF motion. The MDOF-SUSM is expected to be used in manipulators and spacecraft because of its noiseless, self-holding, and non-magnetic properties. Previous studies have shown the feasibility of the MDOF-SUSM using a spherical stator, but the weight of the device was problematic. This paper describes a hemispherical shell stator devised to reduce the weight of the MDOF-SUSM. For the prototype stator, a suitable vibration mode search and an excitation method were investigated using finite element analysis (FEA). A combination of l2m1-mode and l1m0-mode was selected and found to be excitable by an arched piezoelectric ceramic plate bonded to the opening. A stator support mechanism using four tuning forks was also devised. The vibration characteristics of the prototype stator were experimentally investigated. The results of FEA and displacement measurement confirmed the formation of multiple natural vibration modes that can be used for rotation. Rotation with three degrees of freedom was confirmed to be possible by combining the vibration modes. In short, a hemispherical shell stator for the MDOF-SUSM was created, and it is lighter in weight than the MDOF-SUSM that used a spherical stator.
-  J. Wang, K. Mitchell, G. W. Jewell, and D. Howe, “Multi-degree-of-freedom spherical permanent magnet motors,” Proc. of IEEE Int. Conf. on Robotics and Automation, Vol.2, pp. 1798-1805, 2001.
-  T. Yano and K. Kaneko, “Basic Consideration of Actuators with Multi DOF Having an Identical Center of Rotation,” J. Robot. Mechatron., Vol.7, No.6, pp. 458-466, 1995.
-  K. Takemura and T. Maeno, “Design and control of an ultrasonic motor capable of generating multi-DOF motion,” IEEE/ASME Trans. Mechatronics, Vol.6, No.4, pp. 499-506, 2001.
-  A. Gofuku, K. Adachi, Y. Okido, and T. Yano, “A Spherical Motor Driven by Electro-Magnets Based on Polyhedrons,” Int. J. Automation Technol., Vol.10, No.4, pp. 599-608, 2016.
-  Y. Nishiura, K. Hirata, and Y. Sakaidani, “3-DOF Outer Rotor Electromagnetic Spherical Actuator,” Int. J. Automation Technol., Vol.10, No.4, pp. 591-598, 2016.
-  K. Kaneko, I. Yamada, and K. Itao, “A Spherical DC Servo Motor with Three Degree of Freedom,” J. Dyn. Sys. Meas. Control, Vol.111, No.3, pp. 398-402, 1989.
-  T. Yano, M. Kaneko, and M. Sonoda, “Development of a Synchronous Motor with Three Degrees of Freedom,” Springer Vienna, Vol.361, pp. 275-280, 1995.
-  T. Yano, “Basic characteristics of a hexahedron-octahedron based spherical stepping motor,” Proc. SPEEDAM 2010, pp. 1748-1753, 2010.
-  M. Kumagai and R. L. Hollis, “Development and control of a three dof spherical induction motor,” Proc. the IEEE Int. Conf. on Robotics and Automation (ICRA), pp. 1528-1533, 2013.
-  S. Park, K. Takemura, and T. Maeno, “Study on Multi-DOF Ultrasonic Actuator for Laparoscopic Instrument,” JSME Int. J., Ser. C: Mechanical Systems, Machine Elements and Manufacturing, Vol.47, No.2, pp. 574-581, 2004.
-  T. Oohashi and S. Toyama, “Development of spherical ultrasonic motor for space,” J. of the Japan Society for Precision Engineering, Vol.81, No.11, pp. 1027-1032, 2015.
-  M. Aoyagi, S. P. Beeby, and N. M. White, “A novel multi-degree-of-freedom thick-film ultrasonic motor,” IEEE Trans. Ultrason. Ferroelectr. Freq. Control, Vol.49, No.2, pp. 151-158, 2002.
-  T. Amano, T. Ishii, K. Nakamura, and S. Ueha, “An ultrasonic actuator with multi-degree of freedom using bending and longitudinal vibrations of a single stator,” Proc. the 1998 IEEE Ultrasonics Symp., Sendai, Japan, Vol.1, pp. 667-670, 1998.
-  K. Takemura, N. Kojima, and T. Maeno, “Development of a Bar-Shaped Ultrasonic Motor for Three-Degrees of Freedom Motion,” J. of the Robotics Society of Japan, Vol.16, No.8, pp. 1115-1122, 1998.
-  C. H. Yun, S. Niwano, J. R. Friend, K. Nakamura, and S. Ueha, “Support Mechanism for the Ball Rotor in the Three-Degree-of-Freedom Ultrasonic Motor,” Jpn. J. Appl. Phys., Vol.42, No.5S, pp. 3000-3001, 2003.
-  K. Takemura, S. Park, and T. Maeno, “Control of multi-dof ultrasonic actuator for dexterous surgical instrument,” J. of Sound and Vibration, Vol.311, No.3, pp. 652-666, 2008.
-  U. Nishizawa, T. Oohashi, and S. Toyama, “Evaluation of spherical ultrasonic motor for space in low temperature condition,” J. of Vibroengneering, Vol.19, No.7, pp. 5170-5181, 2017.
-  M. Aoyagi, T. Nakajima, Y. Tomikawa, and T. Takano, “Examination of Disk-Type Multidegree-of-Freedom Ultrasonic Motor,” Jpn. J. Appl. Phys., Vol.43, No.5B, pp. 2884-2890, 2004.
-  B. Lu, M. Aoyagi, T. Takano, and H. Tamura, “Examination of Sandwich-Type Multidegree-of-Freedom Spherical Ultrasonic Motor,” Jpn. J. Appl. Phys., Vol.49, No.7, 07HE24-1-7, 2010.
-  B. Lu, M. Aoyagi, H. Tamura, and T. Takano, “Development of a Novel Rotor-Embedded-Type Multidegree-of-Freedom Spherical Ultrasonic Motor,” J. Robot. Mechatron., Vol.24, No.5, pp. 876-883, 2012.
-  B. Lu, M. Aoyagi, S. Takahashi, and M. Fujino, “Trial production of rotor-embedded disk type spherical ultrasonic motor,” Proc. 2013 Spring Meeting, Acoustical Society of Japan, pp. 1413-1414, 2013 (in Japanese).
-  A. Mizuno, K. Oikawa, M. Aoyagi, H. Kajiwara, H. Tamura, and T. Takano, “Examination of High-Torque Sandwich-Type Spherical Ultrasonic Motor Using with High-Power Multimode Annular Vibrating Stator,” Actuators, Vol.7, No.1, pp. 8-24, 2018.
-  S. Nakajima, H. Kajiwara, M. Aoyagi, H. Tamura, and T. Takano, “Study on spherical stator for multidegree-of-freedom ultrasonic motor,” Jpn. J. Appl. Phys, Vol.55, No.7S1, 07KE18, 2016.
-  A. Mizuno, H. Kajiwara, H. Tamura, and M. Aoyagi, “Study on Multidegree-of-Freedom Ultrasonic Motor Using Vibration Mode Rotation of Metal Spherical Stator,” Actuators, Vol.11, No.1, 27, 2022.
-  Z. Huang, S. Shi, W. Chen, L. Wang, L. Wu, and Y. Liu, “Development of a novel spherical stator multi-DOF ultrasonic motor using in-plane non-axisymmetric mode,” Mech. Syst. Signal Process, Vol.140, 106658, 2020.
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