MIL-DTL-62186C
3.4 Operating requirements. All alternators shall meet the operating requirements as
specified in 3.4.1 through 3.4.14.
3.4.1 Overspeed. The alternator shall withstand 10 000 revolutions per minute (rpm), for
at least 1 minute, without sustaining damage.
3.4.2 Maximum field voltage (nonoperating). The alternator s field shall withstand an
application of 22 volts (V) of direct current (dc) for 30 minutes without sustaining damage.
3.4.3 Field resistance. The alternator control field shall be 1.80 0.25 ohms ().
3.4.4 Output power. With the alternator providing output power at 650 amperes (A) at
28 Vdc, the field current shall be not greater than 4.25 A at 2400 rpm, and 3.15 A at 8000 rpm.
3.4.5 Ripple voltage. With an output voltage of 28 Vdc, the ripple voltage shall be not
greater than 4 V, peak-to-peak.
3.4.6 Overload output current. The alternator shall withstand an output load of
800 25 A at not less than 23 Vdc for 30 seconds without sustaining damage. The field current
shall be not greater than 4 A.
3.4.7 Alternating current (ac) signal. With 20 2 Vdc applied to the field terminals, the
ac signal level shall be 7.1 0.5 V root mean square (rms) at an alternator speed of 900 rpm, and
8.9 0.5 V rms at an alternator speed of 1100 rpm.
3.4.8 Current transformer (CT) signal. The CT signal level shall be 2.8 + 0.2, -0.3 V rms
with a 650 A load and at 8000 rpm.
3.4.9 Alternator oil system. The alternator shall be equipped with a self-contained oil
pump with a pressure regulator valve. The oil system shall produce a cooling oil flow of not less
than 2.35 gallons per minute (gal/min) (0.15 liters per second (L/s)), nor greater than 6.0 gal/min
(0.38 L/s). The alternator oil pump outlet pressure shall be not greater than the proof pressure.
3.4.10 Transient load. Transient load requirements shall be in accordance with figure 1.
3.4.11 Efficiency. The efficiency of the alternator shall be not less than 65 percent (%).
3.4.12 Proof pressure. The alternator cooling system shall withstand a 200 pound per
square inch (psi) (1379 kilopascals (kPa)) pressure for at least 5 minutes without permanent
physical deformation, rupture, or a leakage rate greater than 10 psi drop per minute (psi/min)
(69 kPa per minute (kPa/min)).
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