Figure 6.3 shows the main
features of the regulator in cross-section. The surface
of each disc is relatively rough; applying pressure
to the discs creates more surface contact, thereby
reducing the resistance of the pile.
When pressure is
reduced, the reverse process happens, and the resistance
through the pile increases. Pressure is applied
to the pile by a spring plate. This compression is
opposed by the action of an electromagnet connected
to the generator output; the strength of the electromagnet’s
fl ux varies in proportion with generator
output voltage.