Primitive model and control strategy of bearingless motors
Akira Chiba
In this chapter, a primitive bearingless machine is introduced. This machine can generate radial forces so that it can be used as a magnetic bearing; it is used here to illustrate the principles of magnetic suspension in bearingless motors. A typical bearingless stator with 4-pole and 2-pole windings and a cylindrical rotor made of silicon steel are described.
6.1 Principles of radial force generation
Figure 6.1 shows the cross section of a primitive bearingless motor under different conditions. In Figure 6.1(a), there is a symmetrical 4-pole flux distribution. The solid curves illustrate the flux paths circulating around the four conductors 4a, these conductors are ...
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