Reserch Projects
Linear oscillatory actuators
・Linear resonant actuator
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The linear resonant actuator realizes high-efficiency operation by driving at the resonant frequency. We are studying the control method using a machine learning and estimated load obtained by a sensor-less method to improve the performance when the unknown disturbance is worked to the actuator. |
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・2-degree-of-freedom resonant actuator
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The 2-degree-of-freedom resonant actuator can drive in 2-degree-of-freedom by only one device. It is independently driven in two-axes using a current vector control. We are developing the sensor-less position control method and investigate the performance when the load is applied. |
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・3-DOF resonant actuator
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The 3-degree-of-freedom resonant actuator can drive in 3-degree-of-freedom by only one device. It is driven by four-phase using the proposed vector control method. We are investigating the principle verification using the prototype. |
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・3-DOF vibration actuator
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The 3-degree-of-freedom oscillatory actuator can drive in 3-degree-of-freedom by only three-coils. It can drive any direction in three-dimensional space. We are evaluating the performance using the prototype. |
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・6-DOF vibration actuator
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The 6-degree-of-freedom oscillatory actuator can drive in 6-degree-of-freedom (3-degree-of-freedom rotation and translation) by only one device. It can apply to the various devices such as a vibration isolator. We are verifying the characteristics using the prototype. |
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・Electromagnetic energy harvester using rotational vibration
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We are studying the electromagnetic energy harvester using a rotational vibration generated in a drive system of an automobile. The proposed harvester can generate electricity by maintenance-free, and the frequency design for power generation is easy. The performance evaluation by the model and principle verification using the prototype were conducted. It is clarified that the proposed harvester can generate electricity. |
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・Multi-degree-of-freedom optical scanner
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Optical scanners are used widely in many applications such as in barcode readers. Recently, optical scanners that have 2 degrees of freedom have been garnering attention. In this research, electromagnetic force and the resonance characteristics of plate springs are used to create a 2 DOF optical scanner. 3D FEM analysis is used to optimize the structure and a prototype is built to validate the analysis results. |
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・Active control engine mount
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Active control engine mounts (ACM) are devices that actively cancel out engine vibrations. We have been developing an electromagnetic actuator for ACMs that can suppress vibration over a wide frequency range, and also its simulation and control method. |
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・2-degree-of-freedom mobile haptic device
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Mobile haptic devices have been attracting attention in the field of visionless navigation and virtual reality. In 2005, a method for haptic display using a linear oscillator under acceleration control was proposed, but it was too large and had only 1 degree of freedom. We are currently studying a 2-DOF oscillatory actuator and its control method for mobile haptic devices. |
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・Mobile linear oscillatory actuator
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One of the applications of the linear oscillatory actuators is vibration devices which is equipped with mobile phones. We have proposed a small and flat linear oscillatory actuator. We are researching multi-functionalized actuators. |
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・Mobile flat linear oscillatory actuator with 2 degrees of freedom
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We have proposed a multi-functionalized actuator with 2 degrees of freedom, which can be controlled in 2 directions independently or simultaneously. The increase of the thrust and moving range are next research themes. |
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・Motor-driven linear oscillatory actuators
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We are developing a simple, high manufacturability linear oscillatory actuator using a dc motor. In this actuator, a DC motor generates rotational motion, which is converted into linear motion by utilizing the attractive and repulsive forces of the permanent magnets. |
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