Simplified carbon pile regulator diagram.
(2) When current flows through the operating coil, the coil exerts a
magnetic pull on the armature and decreases the pressure applied to the carbon
pile. The magnetic pull exerted by the operating coil is proportional to the
current flowing through it.
(a) Thus, as the output of the generator increases, a larger current
will flow in the operating coil and the pressure exerted by the armature on the
carbon pile decreases. The result is an increase in the carbon pile resistance,
thereby reducing the generator field current and decreasing the output voltage.
(b) If the generator output decreases, the process is reversed. The
pressure on the carbon pile increases because of the spring; in turn, this
decreases the carbon pile resistance, thus increasing the generator field and the
(c) When properly adjusted the voltage regulator will stabilize and
maintain the proper voltage output.
(3) A paralleling coil in the voltage regulator is intended for use
where two generators are being operated in parallel. It is normally inoperative.
OS 010, 5-P7