This is an excerpt from "How Magnetic Bearings Work" document. To read the preceding section click here.
Calnetix has pioneered commercial use and holds several key patents on another type of radial active magnetic bearing – the homopolar, PM-biased active magnetic bearing. The basic structure of such a radial active magnetic bearing is shown in Fig. 9, a 3D illustration in Fig. 10 and the operational principle is explained in Fig. 11. FIG. 9