MIL-P-17840C(SH)
3.2.14 Motors.
3.2.14.1 The standardized frame numbers for the various ratings of close-
coupled pump motors shall be as specified in tables II and III. Frame flange
and shaft extension dimensions shall be as shown on figures 2, 3, and 5, as
The mounting bracket between the motor and pump volute shall be
applicable.
furnished by the pump contractor.
3.2.14.2 Alternating current (ac) motors. Ac motors shall be in accordance
with MIL-M-17059 for fractional horsepower (hp) or MIL-M-17060 for integral hp,
except as otherwise specified herein, and shall conform to the following
classification requirements:
A
Service
50 degrees Celsius (°C)
Ambient temperature
Continuous
Duty
Squirrel-cage induction
Type
B
Design (for integral hp motors)
Ball (see figures 2 and 3)
Bearings
Class B, F, H, or N
Insulation
70°C in 50°C ambient
Temperature rise
3
Number of phases
60 Hertz (Hz)
Frequency
440 volts
Voltage
Totally enclosed or totally
Enclosure
enclosed fan-cooled (open
motors not permitted)
3.2.14.3 Direct current (de) motors.
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3.2.14.3.1 Dc motors shall be in accordance with MIL-M-17413 for inte-
gral hp, or MIL-M-17556 for fractional hp, except as otherwise specified herein,
and shall conform to the following classification requirements:
A
Service
50°C
Ambient temperature
Continuous
Duty
115 or 230 volts as specified
Voltage
(see 6.2.1)
Shunt or shunt stabilized
Winding
Ball (see figures 2 and 5)
Bearings
Class B and H (no silicone
Insulation
materials)
70°C in 50°C ambient
Temperature rise
Totally enclosed or totally
Enclosure
enclosed fan-cooled (open
motors not permitted)
3.2.14.3.2 Speed tolerance. The full load speed of dc constant speed
motors with full FIELD, at ambient temperature (40°C) shall be not less than 85
percent of the specified speed for integral and fractional hp motors. Integral
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