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Page Title:
Insulation resistance of windings. |
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|  MIL-M-82433A(OS)
No-load
speed
full
voltage
(4.7.3.2)
(b)
No-load current at full voltage (4.7.3.3)
(c)
No-load speed at half voltage (4.7.3.4)
(d)
Speed versus load at full voltage (4.7.3.5)
(3)
(f)
Stall current (4.7.3.6)
Motor stability (4.7.3.7)
(g)
Acceleration time (4.7.3.8)
(h)
Lead pull test (4.7.3.9)
(l)
Commutation noise test (4.7.3.10)
(j)
4.7.3.1 Insulation resistance of windings. The insulation resistance
shall be measured from either motor terminal to the frame, using a 200
vdc megohmmeter. The reading shall be taken at 15 5 seconds following
application of the megger voltage. The resistance shall be not less than
100 megohms. (see 3.3.4 for exception after life test. It is permissible
to use a conventional ohmmeter (Table VI) for resistance measurements of
less than 1 megohm.)
4.7.3.2 No-load speed at full voltage. The motor output shaft speeds
shall be measured at no-load (less than 2 oz-in) and at 38.0 0.5 vdc in
both directions. The average of the two speeds shall be 115 to 125 rpm.
The speeds in opposite directions shall not differ by more than 4 rpm.
The motor rotation shall conform with 3.3.2.9. The motor operating cir-
cuit shall be equivalent to Figure 3 for this test and all following op-
erating tests except as noted. At least three readings should be taken
in each direction to check constancy of speed and to determine the mean
value. This technique should be used whenever speeds are measured under
no-load conditions.
4.7.3.3 No-load current at full voltage. With motor operating steadily
at full no-load speed (as in 4.7.3.2) the motor currents for both direc-
tions shall be measured. The average for the two directions shall be less
than 0.220 ampere. The difference of the two currents shall be less than
15 percent of the average value.
4.7.3.4 No-load speed at half voltage. The motor output shaft speeds "
shall be measured at no-load and at 19.0 0.5 vdc in both directions.
The average of the two speeds shall be within 45 to 55 percent of the av-
erage full-voltage speed determined under (4.7.3.2).
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