MIL-PRF-62364B
4.5.3.2.3 Dynamic torque. To determine conformance to 3.4.3.3, stopping performance
under conditions of table I shall be measured. With the brake coil energized, the motor shaft with
integral inertia load and the brake rotor shall be brought to the specified speed. The shaft with
inertia load shall be released and then the brake coil shall be de-energized. Stopping time shall be
measured from when power is removed from the brake coil until the brake rotor comes to a
complete stop.
4.5.3.2.4 Drag torque. To determine conformance to 3.4.3.4, the brake assembly shall
be tested for the amount of drag torque. This shall be determined by comparing rotational torque
values of the brake shaft without the brake assembly installed versus the torque values with the
brake assembly installed in the fixture.
4.5.3.3 Air gap. To determine conformance to 3.4.4, with the coil energized and using a
feeler gage, the clearance between the brake pads and the brake disk shall be checked.
4.5.3.4 Engagement and release time. To determine conformance to 3.4.5 and 3.4.6, the
amount of time required for the brake pads to engage and disengage from the moment the coil is
energized and de-energized shall be measured.
4.5.3.5 Insulation resistance. To verify conformance to 3.4.7, the insulation resistance
between coil terminals connected together and the case at 500 Vdc shall be tested as specified in
MIL-STD-202, method 302, test condition B.
4.5.3.6 Dielectric - withstanding voltage. To conform to 3.4.8, tests shall be performed
in accordance with MIL-STD-202, method 301. First, 500 V rms, 60 Hz, shall be applied for
1 minute, or 600 V rms, 60 Hz, shall be applied for 1 second, between terminals connected
together and the case. Next, 450 V rms, 60 Hz, shall be applied for 1 minute and repeated at least
3 times (see 3.4.8).
4.5.3.7 Coil duty. To determine conformance to 3.4.9, energize to 24 Vdc, when
stabilized, for not less than 18 hours. There shall be no deterioration of the brake coil following
this test.
4.5.3.8 Polarity. To conform to 3.4.10, the brake assembly shall be tested for polar
sensitivity.
4.5.3.9 Operating life. To determine conformance to 3.4.11, the brake assembly shall be
subjected to dynamic conditions at the rate of 6 per hour or greater (see 3.4.3.3). There shall be
no indication of brake assembly deterioration. At conclusion of the dynamic test, time to stop
shall conform to table I, and static torque shall conform to 3.4.3.1. During the test, the ambient
temperature shall be cycled between 140°F and -26°F (60°C and -32°C). The temperature cycle
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