MOTO GUZZI V1000 G5 Workshop Manual page 132

,
..
a Electric tests
RUNNING
Idle
Short circuit
Pressure spring
on conClacts
Magnetic
Armature
----+
VOLTAGE
V
11 .5
9
8
Coupling pin
(separated)
spring
, •• / , L---_ __ _ _ _ _ _ _ _ _ _ _ _ - - '
130
AMPERAGE
""
TORQUE
A
kpm 3
2<1-40 6500-8500
320-400
-
0.92
2B<>-360
-
0.82
Operation of relays (fig.
188/ 1
and 188/ 2)
Main purpose Qf a relay is to contact a high voltage
with a somewhat lower one.
Since a starter motor voltage can be of several hun-
dreds amperes, a starter motor system usually em-
ploys relays. To introduce a lower current, a mecha-
nical switch is generally sufficient (starter button ,
ignition key, or riding switch) .
The relay construction is exemplified in fig.
186/ 1.
The core is in unl l with the casing and on one side
it projects against the inner side of the winding while
on the other side it projects against the movable part
of the armature relay. The core-rotor distance is the
travel of the armature.
The relay casing, core, and rotor form a magnetic
circuit. In many executions the relay winding con-
sIsts of two winding grou ps : a propelling winding
and a Ilolding winding . This solution is useful in so
far as thermal load is concerned. In the course of
the engagement,
a
higher magnetic force is gene-
rated . When tile start circuit closes, the propelling
winding is shorted and the only force of the holding
winding is sufficient to energize the relay until the
start contact is opened agai n.
Under the action of tile magnetic force generated
after engagement the armature is drawn into the win-
d ing and the bridge is pushed against the contacts by
the spring located between armature and bridge. The
return spring assures that contacts will open. The re-
turn spring assures that the contacts witl open. In ad-
dition to relays with single commutation, in starter
motors are also used engaging relays in which the
rotor movement is further exploited by the axial di-
splacement of Ihe pinion. The coupling magnet, also
used on starter motor, works in the same way but
does not make any commutalion.
Screwing on type end Iranslatlon starter motor
Construction of these motors and their Internal cir-
cuits is shown in fig . 188/3-188 / 4-188 / 5.
Starter motors of this type are operated by an in-
corporated engaging relay.
At its jutting end, the relay armatu re has a groove
which engages the opera ling lever witll a predeter-
mined clearance which is called free run. Purpose
of this free run is that, on disengag ing , the relay re-
lurn spring pushes the armature towards the initial