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|  MIL-M-17413A(NAVY)
3.2.5 Winding and speed. - The rated speed in revolutions per minute (r.p.m) or rated speed
range in r.p.m. shall be as specified (see 6.2). Except for submarine service (see 3.7.2), the winding
and speed classification of motors shall be one of the following, as specified (see 6. 2):
Shunt (or stabilized shunt) constant-speed.
Shunt (or stabilized shunt) adjustable.
Shunt (or stabilized shunt) multispeed.
Compound, varying speed.
Compound, adjustable varying-speed.
Compound, varying multispeed.
Series, varying speed.
Series, adjustable varying-speed.
Series, varying multispeed.
3.2.5.1 Stabilized shunt need not be specified in the contract or order, since the method of obtaining
stability is at the option of the manufacturer.
3.2.6 Duty. - The duty of motors shall be continuous, intermittent, varying, or short-time as
specified (see 6.2).
3.2.6.1 Continuous duty. - Continuous duty motors shall be rated at the horsepower load that can
be carried continously at the ambient temperature specified (see 6.2) without exceeding allowable
temperature rises (see table V and 3.1.1).
3.2.6.2 Intermittent duty. - Intermittent duty motors shall be rated at the horsepower load and for
the time duration which will permit operation of the motor indefinitely at the ambient temperature speci-
fied (see 6.2) and at the cycle of load, no load and rest specified (see 6.2) without exceeding the allowable
temperature rises (see table V and 3.1. 2). Where intermittent operation is involved and no definite
operating cycle can be given, a short-time duty motor of sufficient rating to meet the estimated load
requirements shall be furnished.
3.2.6.3 Varying duty. - Varying-duty motors shall be rated at the horsepower loads and for the
time duration which Will permit operation of the motor indefinitely at the ambient temperature specified
(see 6.2) and at the cycle of varying loads specified (see 6.2) without exceeding allowable temperature
rises (see table V and 3.1. 3). Unless otherwise specified in the contract or order, varying-duty motors
shall be capable of operating at 1/4 load until temperature stabilizes followed by full rated load for the
specified period.
3.2.6.4 Short-time-duty. - Short-time-duty motors shall be rated at the horsepower load which,
starting at the ambient temperature as specified (see 6. 2), can be carried constantly for the period speci-
fied (see 6.2) without exceeding allowable temperature rises (see table V and 3.1. 4).
3. 2.7 Enclosure. - Enclosures shall conform to Specification MIL-E-2036. Motors shall be of the
following enclosures as specified (see 6. 2):
Totally enclosed.
Dripproof protected.
Totally enclosed fan-cooled.
Spraytight .
Explosionproof.
Spraytight fan-cooled.
Watertight.
Explosionproof fan-cooled.
Submersible (15 foot).
Watertight fan-cooled.
Submersible (50 foot).
3.2.8 Standard horsepower sizes. - Motors shall be furnished in the following standard horsepower
sizes (see 6.2):
20
40
1
25
7-1/2
45
1-1/2
2
10
30
50
15
35
3
Over 50 as required
5
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