MIL-DTL-17060G(SH)
3.5.2.4 Nonmagnetic motors. When specified (see 6.2), nonmagnetic motors shall meet the Service A
3.5.2.4.1 Construction. Motors shall be as follows:
a.
Have not less than four poles
b.
Have no protuberances of magnetic material, such as feet or supports
3.5.2.4.2 Materials. Materials shall be as follows:
a. Parts shall be of nonmagnetic material having a maximum relative permeability of less than 2 after
fabrication.
b.
The use of ferromagnetic material shall be considered for the following parts only:
(1) Parts in the electrical magnetic circuits.
(2) Parts for which substitution of nonmagnetic materials could not be provided without impairing either
the strength or satisfactory operation of the motor.
3.5.2.5 Motors for submarine service. When specified (see 6.2), motors for submarine service shall meet
3.5.2.5.1 Enclosures. The enclosures shall be as specified in 3.5.1.8 or shall be special as specified (see 6.2)
except that dripproof protected enclosures shall meet the requirements of MIL-STD-108 at 45 degrees from the
vertical in lieu of 15 degrees.
3.5.2.5.2 Mounting. Horizontal motors shall be constructed for either deck mounting or overhead suspension.
Dual ended, ventilated (air inlets in both end shields and air outlets in frame), dripproof protected, horizontal motors
are acceptable provided a shield is constructed to meet the necessary dripproofness requirements when the motor is
suspended from an overhead structure. This shield shall be provided when required (see 6.2). Tests on dual ended,
dripproof protected, horizontal motors shall be conducted with the shield installed on the motor.
3.5.2.5.3 Feet. Unless otherwise specified (see 6.2), the feet shall be detachable and secured by means of bolts
if by this arrangement the motor can be passed through a specified diameter round hatch. The bottom of the feet
shall be machined to a finish of 100 to 125 microinches root mean square (rms). The bottom of the feet shall be
blued in lieu of painting. Deviation from coplanarity of the feet shall not exceed the following:
By feeler gauge
Frame
(inch)
182 - 326
0.002
365 - 445
0.003
Above 445
0.004
3.5.2.5.4 Terminal boxes. Except for symmetrical motors, means shall be provided for mounting the terminal
box on either side of the frame. Internal leads shall be of sufficient length to allow connections to the terminal box
on either side of the frame. On horizontal motors, the end shields shall be interchangeable, the frame shall be able to
be turned end for end, and the rotor shall be reversible in the assembly. On vertical motors, mounting holes shall be
symmetrical so that stator can be rotated 180 degrees on the mounting foundation.
3.5.2.5.5 Ball bearings. The requirements of 3.5.2.1.5 through 3.5.2.1.5.2 are applicable with the following
exceptions:
a.
Bearings shall be Type 111, Class 1, 2, 3, 7, and 8 or Type 120 (see 3.5.1.22.4)
b. Bearings, their fit ups, and other application requirements shall be in accordance with MIL-B-17931 and its
application appendix.
3.5.2.5.6 Shafts. Keyways which extend up to the bearing seat shall be end milled. Keyways shall not extend
under the bearing more than absolutely necessary and under no circumstances under the ball track.
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