{"title":"利用电子和永久磁铁开发故障安全磁流变流体装置","authors":"Takehito Kikuchi, Rihiro Fukuyama, Isao Abe","doi":"10.1177/1045389x241272927","DOIUrl":null,"url":null,"abstract":"An important design strategy in the safety of any mechanical system is the “fail-safe” concept, which is used to prevent inevitable mistakes from resulting in accidents. For a failsafe design, the proper combination or selection of both normally open and closed devices is important. However, most conventional Magnetorheological fluid (MRF) devices are normally open, and their output force/torque disappears in the off state of the current input. Therefore, the development of a normally closed MRF device (NC-MRD) may contribute to a fail-safe mechatronics system. In this study, we analytically and experimentally investigated the effects of separated axial magnetized permanent magnets (PM) on normally closed and rotary-type MRF devices. We used two types of separated axial PM as magnetization resources in the off state of the electric magnet (EM). The distributions of the magnetic flux densities in the off and balanced states were evaluated as representative values of the NC-MRD. As a real testbed, we designed and developed the NC-MRD using three commercially available sectional axial neodymium magnets. The experimental results showed that the device generated a braking torque in the off state of the EM. With a positive input current of approximately 200 mA, the torque was almost balanced, and the minimum torque was less than 0.1 Nm, which was less than 2% of the maximum torque.","PeriodicalId":16121,"journal":{"name":"Journal of Intelligent Material Systems and Structures","volume":null,"pages":null},"PeriodicalIF":2.4000,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Development of a fail-safe magnetorheological fluid device using electro and permanent magnets\",\"authors\":\"Takehito Kikuchi, Rihiro Fukuyama, Isao Abe\",\"doi\":\"10.1177/1045389x241272927\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"An important design strategy in the safety of any mechanical system is the “fail-safe” concept, which is used to prevent inevitable mistakes from resulting in accidents. For a failsafe design, the proper combination or selection of both normally open and closed devices is important. However, most conventional Magnetorheological fluid (MRF) devices are normally open, and their output force/torque disappears in the off state of the current input. Therefore, the development of a normally closed MRF device (NC-MRD) may contribute to a fail-safe mechatronics system. In this study, we analytically and experimentally investigated the effects of separated axial magnetized permanent magnets (PM) on normally closed and rotary-type MRF devices. We used two types of separated axial PM as magnetization resources in the off state of the electric magnet (EM). The distributions of the magnetic flux densities in the off and balanced states were evaluated as representative values of the NC-MRD. As a real testbed, we designed and developed the NC-MRD using three commercially available sectional axial neodymium magnets. The experimental results showed that the device generated a braking torque in the off state of the EM. With a positive input current of approximately 200 mA, the torque was almost balanced, and the minimum torque was less than 0.1 Nm, which was less than 2% of the maximum torque.\",\"PeriodicalId\":16121,\"journal\":{\"name\":\"Journal of Intelligent Material Systems and Structures\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2024-08-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Intelligent Material Systems and Structures\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1177/1045389x241272927\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Intelligent Material Systems and Structures","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1177/1045389x241272927","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Development of a fail-safe magnetorheological fluid device using electro and permanent magnets
An important design strategy in the safety of any mechanical system is the “fail-safe” concept, which is used to prevent inevitable mistakes from resulting in accidents. For a failsafe design, the proper combination or selection of both normally open and closed devices is important. However, most conventional Magnetorheological fluid (MRF) devices are normally open, and their output force/torque disappears in the off state of the current input. Therefore, the development of a normally closed MRF device (NC-MRD) may contribute to a fail-safe mechatronics system. In this study, we analytically and experimentally investigated the effects of separated axial magnetized permanent magnets (PM) on normally closed and rotary-type MRF devices. We used two types of separated axial PM as magnetization resources in the off state of the electric magnet (EM). The distributions of the magnetic flux densities in the off and balanced states were evaluated as representative values of the NC-MRD. As a real testbed, we designed and developed the NC-MRD using three commercially available sectional axial neodymium magnets. The experimental results showed that the device generated a braking torque in the off state of the EM. With a positive input current of approximately 200 mA, the torque was almost balanced, and the minimum torque was less than 0.1 Nm, which was less than 2% of the maximum torque.
期刊介绍:
The Journal of Intelligent Materials Systems and Structures is an international peer-reviewed journal that publishes the highest quality original research reporting the results of experimental or theoretical work on any aspect of intelligent materials systems and/or structures research also called smart structure, smart materials, active materials, adaptive structures and adaptive materials.