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RISS 인기검색어
- 검색키워드
- 저자 : Tadashi Hama (검색결과 2 건)
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Novel and Compact Thermomagnetic Actuator Using Temperature-Sensitive Magnetic Materials
Tadashi Hama,Kaiji Sato 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.12
This paper describes the structure and characteristics of a novel compact actuator that uses a combination of temperature-sensitive magnetic materials (TSMMs) and permanent magnets (PMs). The actuator has the potential to generate a large force per volume, while the absence of a coil structure makes it easy to downsize. The structure and driving principles of the actuator were determined to exploit the advantages of this combination, and thrust force characteristics were examined through numerical analysis. The thrust force generated was measured based on the temperature of the TSMMs. The temperature characteristics were investigated experimentally and theoretically. In addition to thrust force, the energy consumption was experimentally examined with respect to the TSMM temperature. The results indicate that the proposed actuator performed better than a conventional electromagnetic actuator in generating a large continuous thrust force.
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High-Speed Positioning of Ultrahigh-Acceleration and High-Velocity Linear Synchronous Motor
Kaiji Sato,Tadashi Hama 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This paper describes the high-speed positioning of a moving permanent magnet linear synchronous motor (MPM LSM) utilizing itshigh thrust-to-mover mass ratio of 908 N/kg. The MPM LSM was designed to have a high static thrust-to-mover mass ratio for highaccelerationand high-velocity motion However, the MPM LSM has large inductances and large back electromotive force (EMF), bothof which slow down the current response and greatly reduce the available thrust force. Under the limited supply voltage condition,these features deteriorate the response of the MPM LSM, as represented by the acceleration and velocity characteristics. To reducethe effect of the features on the response, a simple and basic dynamic model of the MPM LSM is derived and used in the design ofa phase lead function for the high response. The effectiveness of the phase lead function, which improved the response, is examinedby straight motion and positioning experiments. The high-speed positioning performance is verified by using the control system withthe phase lead function. The experimental response to a step input of 300 mm shows acceleration higher than 500 m/s2, velocity higherthan 7.76 m/s and position error smaller than 2 mm.
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