1994 Fiscal Year Final Research Report Summary
Study on Hybrid Magnetic Bearing
| Project/Area Number |
04452133
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
MATSUBARA Tomio Nagoya Institute of Technology.Mechanical Eng., Professor, 工学部, 教授 (20026032)
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| Co-Investigator(Kenkyū-buntansha) |
MURAKAMI Shin Nagoya Institute of Technology.Mechanical Eng., Assistant, 工学部, 助手 (40239489)
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| Project Period (FY) |
1992 – 1994
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| Keywords | High speed noncontact bearing / Hydrostatic air bearing / Magnetic bearing / PID control / H * control / Hybrid bearing |
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| Research Abstract |
The dynamic characteristics of hybrid magnetic bearing that is combined by the hydrostatic air bearings and magnetic bearings is investigated. Basic specification of the spindle with the hybrid magnetic bearing proposed in this study is as follows : Diameter of the shaft ; 60mm Maximum speed ; 50000rpm (DN value=3,000,000) Radial load carrying capacity ; 1000n, Radial stiffness ; 100N/mum Axial load carrying capacity ; 5000N,Axial stiffness ; 500N/mum
First of all, avobe described hybrid magnetic spindle is designed and manufactured and then the dynamic characteristics of the spindle is investigated. The reults obtained are follows. The load carrying capacity and static stiffness of the spindle are almost same values with the expected values and the multiple effect of the hydrostatic and magnetic bearings on the loard carrying capacity and stiffness of the spindle are observed in the experiment. It is declared from the tests of dynmic stiffnes of the system that tuning the PID parameters to obtain the maximum performance is very important. At high speed rotating tests, a significant deflection of the shaft is observed over 45,000rpm. From this result, the strength and manufacturing process of the shaft are rested to be more investigated. With respet to the dynamic stability at high speed rotation, relatively lower performance is obtained by the PID controll and also the spill-over phenomena of the higher bending vibration of the shaft is observed. These results sugest the limitation of the PID control system. Then H * digital control with DSP is applied to the system. The simulation of dynami characteristics with relatively lower order filtering model shows the good charcteristics, therefore, the digital control system is very usefull to obtain the higher dyanamic performance of the hybrid magnetic spindle and it has to be more investigated in future. 10. Key words
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Research Products
(8 results)
