Directional gyro, ring gear and torque motor
RESTRICTED
The upper gudgeon of the stabilizer cardan
projects through the top of the case and acts as
the male member of the bombsight clutch.
The gyro has a series wound motor. The
starting amperage is 6 amps for 24 volt units
and 10 amps for 12 volt units. The running am-
perage is about half of the above amperes as given
for 12 and 24 volt units. The M-6 running amper-
age is 3 to 4 amps.
The normal operating speed is approximately
7800 revolutions per minute.
E. Ring
Gear
Fig. 5
Fig. 19
pg. 34
The top of the cardan carries the large
stabilizer ring gear through which the torque of
the torque motor is impressed upon the cardan.
This torque is about the vertical axis of the
gyro so that all precessional forces applied by
the torque motor will affect the horizontal axis.
F. Torque
(Servo)
Motor
Fig. 6
In order to provide the degree of direct
stabilization necessary, some means of assisting
the gyro must be used. The torque motor provides
that means.
The torque motor assembly consists of the
following parts: DC Shunt wound motor assembly,
two clapper magnets, two clapper magnet armatures,
two bayonet springs, two cork faced drive gears,
two clutch plates, intermediate drive gears link-
ing torque motor and ring gear, and brushes which
contact the slip rings located on top of the gyro
cardan.
The motor rotates the two cork-faced drive
gears constantly in opposite directions.
The purpose of the torque motor is two-fold.
First, it is an electro-mechanical power ampli-
fier. Second, it exerts counter forces upon
the stabilizer gyro cardan which tends to keep
the gyro axis from moving in its efforts to sta-
bilize the bombsight directionally. Since the
stabilizer must, of necessity, be relatively
small, any stabilizing force exerted by it sets up
relatively large counter forces which tend to pre-
cess the gyro axis from its original direction in
space and, in effect, is the equivalent of the
directive power of a gyro many times larger than
the one actually used.
Any forces which act on the stabilizer gyro
in its normal operation do so in such a way as to
move the axis in a vertical plane. In such move-
8