MIL-PRF-62364B
3.4.3.4 Drag torque. Drag torque is the torque required to rotate the brake shaft with
the coil energized. The brake(s) shall have a drag torque of not more than 3 in.-lb (0.34 N-m) on
the rotational brake shaft (see 4.5.3.2.4).
3.4.4 Air gap. When the coil is energized, the air gap between the brake pads and the
brake disk shall be adjusted to not less than 0.005 inch (in.) [0.127 millimeter (mm)] (see 4.5.3.3).
3.4.5 Engagement time. The friction brake pads shall make contact with the brake disk
within 0.1 s from the moment that the coil is de-energized (see 4.5.3.4).
3.4.6 Release time. The friction brake pads shall release from contact with the brake disk
within 0.1 s from the moment that the coil is energized (see 4.5.3.4).
3.4.7 Insulation resistance. Insulation resistance shall be not less than 100 megohms
from the coil terminals connected together and the case when 500 Vdc is applied (see 4.5.3.5).
3.4.8 Dielectric-withstanding voltage. The brake assembly shall withstand 500 V
root-mean-square (rms), 60 hertz (Hz) for 1 minute, or 600 V rms for 1 s, between terminals
connected together and the case. After initial test, the brakes shall be capable of withstanding
repeated tests at 450 V rms 60 Hz. There shall be no degradation of performance (see 4.5.3.2.2
thru 4.5.3.5) following these tests (see 4.5.3.6).
3.4.9 Coil duty. Coil insulation shall be adequate for continuous operation at 24 Vdc
when stabilized at 40 degrees Fahrenheit (°F) [60 degrees Celsius (°C)] and when installed on an
aluminum gearbox, Drawing 12265895 (see 4.5.3.7).
3.4.10 Polarity. The brake assembly shall not be polarity sensitive (see 4.5.3.8).
3.4.11 Operating life. The electromagnetic brake assembly shall perform a minimum of
34 560 on-off cycles when applying and releasing the brake pads under static conditions, and in
accordance with 3.4.3.3, a minimum of 4410 cycles of stopping and releasing the brake disk under
dynamic conditions. The brake assembly shall be capable of performing the specified number of
cycles under any environmental condition specified herein without failure, adjustment, or
replacement of any component (see 4.5.3.9).
3.4.12 Environmental requirements. The design, materials, and construction of the brake
assembly shall enable the unit to operate as specified in the environmental conditions called out in
this specification during exposure to those environments designated as operating. The unit shall
not be damaged nor its performance impaired after exposure to those environments designated as
non-operating (see 4.5.3.10):
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