1935 Cadillac - GM Heritage Center

Cadillac Preliminary Service Information 21
~MM 2900 Wl
Generator Speed (R.P.MJ
193-5 ampere turns, must be furnished
by the current flowing to
the battery. Since this current
flows through 43 turns, we have
193.5 divided by 43, which equals
4.5 amperes to battery. This
gives 11 amperes lights,' plus 4-5
amperes to battery, or a total generator
output of 15.5 amperes.
This represents an increase of 5-5
amperes by turning on the lights,
or an increase of one-half the light
load.
Since the lighting current
flows through one coil only, it
will only have half as much effect
per ampere as battery current in
Fig. 26. Typical performance curves of "D" and "C" Series generators.
These curves indicate the current output at the generator. The Operating the regulator. The total
ratio of generator to engine speed is 1.35 to 1 on the 355-D and 1.40 to „ „ „ 1 , r , „ „ , . „ „ , „ „ , _
1 on the 370-D and 452-D cars number of ampere turns to actuate
the magnet coils will likewise be decreased to such
a point that the spring tension overcomes the
magnetic pull on the armature, and closes the
contacts.
This, operation is repeated many times
per second, so that the regulator will operate for a
reasonably' constant current, which will depend
upon the spring tension applied to the armature.
the regulator remains constant,
so that the generator output is
increased by half the lighting load.
In contrast to voltage regulators and relays, a
current regulator inherently regulates for the same
current, either hot or cold. For pleasure cars it
seems advisable to increase the cold output to take
care of those cars which are being driven only a
From the circuit diagram Fig.
29 it is obvious that the current
flowing to the battery also flows
through both magnet coils, each
of which has 21.5 turns. This
regulator is adjusted for 10 amperes
with the lights off, and the
spring tension is therefore adjusted
to equal the magnetic pull
of 430 ampere turns. If an 11
ampere light load is now turned
on, it will be noted that this'current
flows through one coil only,
and therefore creates 236.5 ampere
turns.
Since it requires 430ampere turns
to operate the regulator, the
difference between these two, or
33
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40 50 «°
Cor Speed in Mile, Per Hour
Fig 27 These performance curves are shown to exemplify the difference
in characteristics of the "D" and "C" ser.es generators as
indicated by the car ammeter