ABSTRACT
An electromagnetic coil outside the OM and concentric with it is used to activate the brake or clutch. When the coil in energized by passing current through it a magnetic field is established which causes the particles to bridge the gap between the IM and the OM and form links between the two, as represented in Figure 6(b). These links are along the magnetic lines of force, which are made nearly perpendicular to the OM by the configuration of the OM and the coil housing, as shown in Figures 6 and 7.
