MIL-M-60144A(MU)
be such that a complete cycle (5-500-5) will consume approximately 15
minutes. The test shall continue for four 15-minute cycles for a total
of 1 hour. (When provisions for logarithmic cycling is not available,
a linear rate of frequency change may be used.) The cycling test shall
be repeated with the axis of vibration changed 90 degrees in the hori-
zontal direction and then with the axis of vibration changed to vertical.
At the completion of each direction of vibration, the control motor shall
be closely inspected for any evidence of mechanical failure and loose or
broken parts. At the end of test, the control motor shall meet the re-
quirements of 3.6.
4.6.3 Performance.
4.6.3.1 Torque sensitivity and linearity test.- Mount the control
m o t o r in a test device as depicted in Figure 1. T a k e the current read-
i n g s v e r s u s t h e l o a d p o i n t s f o r O , 1, 2, 3, 4, 5, 6 and 7 pounds. Re-
v e r s e the current source and repeat the test. M a k e a graphical plot of
t o r q u e (pounds times torque arm in feet) versus average current. E s t a b l i s h
t h e most favorable line on the plotted points. T h e resultant plot shall
m e e t the requirement specified in 3.6.1 and 3.6.2.
4 . 6 . 3 . 2 T o r q u e v a r i a t i o n t e s t . - W i t h the control motor connected
a s in 4.6.3.1, energize the control motor with a current of 2 amperes.
M e a s u r e the spring deflection at four-compass points of the armature which
a r e a known equal distance from the center of rotation. R e p e a t for both
c l o c k w i s e and counterclockwise rotations and average the resultant read-
ings. Plot the points and establish the best straight line. The resul-
t a n t plot shall meet the requirement specified in 3.6.3.
torque test.- With the control motor connected as
4.6.3.3 Friction
in 4.6.3.1, and the control motor sensitivity having been established,
measure the breakaway or minimum current at which motion of the armature
occurs. Repeat three times for both clockwise and counterclockwise ro-
tation and average the readings. Then using the established torquer
sensitivity of 4.6.3.1, calculate the friction torque to insure compliance
with 3.6.4.
4.6.3.4 Peak torque volt-amp test.- Connect the control motor as
in 4.6.3,1 with the addition of a 1.0% accuracy voltmeter connected across.
the control motor input. Install in a hot chamber stabilized at1500F
Apply 2.74 amperes to the control motor and observe the scale deflection
for maximum torque and simultaneously observe the voltage readings. Veri-
fy compliance with 3.6.5.
4.6.4 Radio interference s u p Pression.- The control motor shall be
t e s t e d in accordance with MIL-I-6181.
PREPARATION FOR DELIVERY
5.
5.1 Packaging. packing and marking.- Packaging, packing and marking
shall be in accordance with MIL-P-14232 and Packaging Data Sheet MIL-P-
14232/P10527238. The level of protection shall be as specified in the
procurement document.
8.
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