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Dynamics of permanent-magnet biased active magnetic bearings
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Fukata, Satoru Yutani, Kazuyuki |
| Copyright Year | 1996 |
| Description | Active magnetic radial bearings are constructed with a combination of permanent magnets to provide bias forces and electromagnets to generate control forces for the reduction of cost and the operating energy consumption. Ring-shaped permanent magnets with axial magnetization are attached to a shaft and share their magnet stators with the electromagnets. The magnet cores are made of solid iron for simplicity. A simplified magnetic circuit of the combined magnet system is analyzed with linear circuit theory by approximating the characteristics of permanent magnets with a linear relation. A linearized dynamical model of the control force is presented with the first-order approximation of the effects of eddy currents. Frequency responses of the rotor motion to disturbance inputs and the motion for impulsive forces are tested in the non-rotating state. The frequency responses are compared with numerical results. The decay of rotor speed due to magnetic braking is examined. The experimental results and the presented linearized model are similar to those of the all-electromagnetic design. |
| File Size | 802924 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960050148 |
| Archival Resource Key | ark:/13960/t4mm1858g |
| Language | English |
| Publisher Date | 1996-07-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Magnetic Flux Magnetization Bias Permanent Magnets Magnetic Bearings Rotating Shafts Stators Linear Circuits Dynamic Models Electromagnets Frequency Response Linear Equations Eddy Currents Magnetic Circuits Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
