4
Figure 1.
a) dependence of alternator voltage
Ud
and current rate
I
в
at rotor operating speed
n
in a
drive winding;
b) dependence of alternator voltage
Ud
and current rate
I
в
at load current
I
н
in a
drive winding
.
1.2.4. Any voltage regulator contains:
- receiving alternator voltage sensing element, (usually volt box on a regulator input);
- comparison element, in which alternator voltage is compared with a reference value;
- changing the current in the in a
drive winding regulating unit, if an alternator voltage is different from a
reference value.
1.2.5. Potential regulator defect may be:
- contact pollution and contamination; weakening of brushes hold-downs; mechanical and thermal components
damage; short circuit; resistors, diodes and semiconductor chip defects.
a) b)
Figure 2. Voltage regulators.
а
)
Ford/Magneti-Marelli
with terminal
FR-SIG
-
A
b)
Mitsubishi/Hitachi
with terminal
P-D