Torque motor maintenance
RESTRICTED
c. Torque
Motor.
The toroue
motor is
a parallel wound moto-
rotating
at approximately 4|44 г.p.м.
Tre clutch
1o r. p.m, plus or
5 г.р. т.
The cluich gears rotate in opposite directions..
The bronze gear rotates
counter clockwise and
applies
a counter clock-wise torque to the ring
gear. !f the
isolated
sector contact brush con-
tacts one of the iower segments, the clapper magnet
under the brass
gear is
energized and the gyro
is precessed
back to the neutral position.
I f
the isolated
sector contact
brush contacts the
upper segments of the isolated sector, the clapper
magnet under the steel gear is energized
and the
gyro is precessed to the neutral position.
1. To check the speed of the torque motor;
tor contact stab
a. Wedge the gyro so that the isolated sec-
contacts
a 12 volt segment.
With stabilizer switch
"off", clutches
disengaged and
servo "on",
torque motor should
turn cardan approximately 3 R. P.M. plus or minus
1/2. R. P.M.
it does not,
check
magnet
and torque
motor and check for
clutch slippage.
Repeat the above procedure in the opposite
direction.
The torque motor clutches slip at 32-35 lbs.
minimum.
With bombsight clutch
set at 24 lbs.,
engage
it with
gyro dead.
Hold down
or up on
gyro bearing cap so that stabilizer brush contacts
12 volt sector.
With torque motor "on"
ber of clutch
should turn. inside clutch cobiar.
Make check
in both directions.
To increase pull
magnets,
turn off one
thousand th
+ a time from the bronze plug in
the magnet
clapper on which the clutch plate pinion rests.
must be done in a lathe and
only if absolut-
ely necessary.
The pivot pins that hold the clap-
pers in
should be perfectly straight.
movement of the clappers is essentia!
Adjust
the torque clutch plates to minimum clear-
ance without drag by shaping the
tips of the bay-
springs.
This clearance wili be
approximat-
ely .003"
The back lash between the intermediate
and
precession gears can be adjusted by removing
or adding paint to the torque motor frame.
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