Dynamic characteristics of three-degree-of-freedom resonant actuator

IEEJ Transactions Elec Engng

2022

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Asymmetric vibration-based haptic devices are being developed to apply to various applications such as navigation systems. A mobile-type three-dimensional haptic device requires a compact structure. Then, we focused on a three-degree-of-freedom oscillatory actuator (3-DOFOA). However, conventional 3-DOFOAs are large in size and weight because they need a large and complicated support mechanism on the outside of the magnetic circuit. Furthermore, they do not satisfy both the requirement of similar force characteristics in each axis and no interference. To address these issues, we propose a novel 3-DOFOA integrated with a support mechanism that has equal static characteristics in each axis without interference. The proposed structure and operating principle are described in detail in this paper, as well as the force, frequency characteristics, and acceleration responses. As these results, it can be concluded that the proposed actuator is suitable for use as a haptic device.

Section: Specifications Of the Modelmentioning

confidence: 70%

“…The overall volume is reduced by about 99.0% and the weight by about 95.0%, compared with the actuator proposed by Kato et al . [17].…”

Section: Magnetic Structure and Operating Principlementioning

confidence: 99%

Performance Analysis of a CompactThree‐Degree‐of‐FreedomOscillatory Actuator for Haptic Device

Nakamura

Heya

IEEJ Transactions Elec Engng

2022

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“…To solve these problems, various types of multiple-DOF OAs are proposed and developed [5][6][7][8][9]. The multiple-DOF OA can generate multiple-DOF motion only one device.…”

Section: Introductionmentioning

confidence: 99%

“…The two-DOF OA can drive two-DOF with only two-coils and two-phase [6], it has a flat structure and was designed for a haptic interface. The three-DOF resonance actuator can drive three-DOF with four-coils and fourphase [7,8], it has an axial gap structure. The three-DOF OA can drive three-DOF with three-coils and three-phase [9], it has a cubic shape.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Five-Degree-of-Freedom Oscillatory Actuator

Heya

2022

IEEJ Journal IA

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Oscillatory actuators (OAs) are used in various fields, such as industrial equipment and home appliances. For example, they are applied in active vibration isolation tables, vibration test devices, and haptic interfaces. They have a multiple-degree-of-freedom (DOF) mechanism with short-stroke. Such conventional mechanisms consist of some actuators and links, therefore, the vibration center is shifted and the size and weight increase. To solve these problems, various types of multiple-DOF OAs have been developed. However, a five-DOF OA has been not proposed. To further realize the functionality by increasing the DOF, we propose a five-DOF OA. Its basic structure and operating principle are described. The thrust and torque characteristics are investigated by a magnetic field analysis using a three-dimensional finite element method. The analysis results indicate that the proposed actuator can drive five-DOF without interference between other axes.

“…Authors have also proposed a two degree-of-freedom resonant actuator that was able to be independently driven in x-and z-axes by vector control [8][9][10]. Additionally, authors have designed a three-DOF resonant actuator driven by conventional vector control [11]. However, the previous control method did not completely control the thrusts in three directions (x, y, and z) because the magnetic circuit for each axis was not independent.…”

Section: Introductionmentioning

confidence: 99%

Control of three-degree-of-freedom resonant actuator driven by novel vector control

Kato

Transportation Systems and Technology

2018

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This paper presents a novel vector control method for three-degree-of-freedom resonant actuator in order to improve its controllability. The effectiveness of the presented method is verified through electromagnetic field analysis using 3-D finite element method: Issue: A three-degree-of-freedom resonant actuator has a great potential to broaden the application range of linear oscillatory actuators because it has a lot of advantages: high efficiency, simple structure, etc. However, this actuator has low controllability because the magnetic structure of each axis is not independent. Aim: To establish a novel vector control technique suitable for our actuator. Materials and methods of the studies: Electromagnetic analysis employing 3-D finite element method. Results: In this study, the novel vector control theory was constructed on the basis of four-phase system. The new dq model was achieved by considering 3-D coordinate transformation. The proposed method is able to decrease the influence of thrust interference from other axis and achieved higher controllability. Conclusion: The results of the study will contribute to a practical use of the three-DOF resonant actuator.