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|  MIL-M-17059A(SHIPS)
STANDARDS
MILITARY
MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes.
MIL-STD-108 - Definitions of and Basic Requirements For Enclosures for Electric and Elec-
tronic Equipment.
MIL-STD-414 - Sampling Procedures and Tables for Inspection by Variables for Percent De-
fective.
(Copies of specifications, standards, drawings, and publications required by suppliers in connection
with specific procurement functions should be obtained from the procuring agency or as directed by the
contracting officer.)
3.1 General design. -
3.1.1 Ambient temperatures. - Motors shall be designed for the following ambient temperatures, as
specified (see 6. 1):
40C., 50C., 65C., 80C. and special.
3.1.2 Airborne noise. - Motors shall operate without objectionable airborne noise at all loads and speeds
within the service range (see 4.3.4.4).
3. 1.3 Voltage. - Motors shall be designed for the following voltages, as specified (see 6.1):
Three-phase:
Single phase:
115
115
440.
Special.
Special.
3.1.4 Voltage limitations. - All motors shall be designed to operate continuously at rated horsepower out-
put and frequency with the voltage not more than 10 percent above or below rated voltage, but not neces-
sarily in accordance with the requirements for operation at rated conditions.
3.1.5 Frequency limitations. - All motors shall be designed to operate continuously at rated horsepower
output and voltage, with frequencies not more than 5 percent above or below the rated frequency but not
necessarily in accordance with the requirements for operation at rated conditions.
3.1.6 Combined variation of voltage and frequency. - Alternating-current motors shall operate suc-
cessfully at rated load with a combined variation in the voltage and frequency up to 10 percent above or below
the rated voltage and the rated frequency, provided that the frequency variation does not exceed 5 percent. In
determining compliance with this requirement, the signs of both percent variation of voltage and percent
variation of frequency shall be considered positive. Under this condition of operation the performance need
not necessarily be in accordance with the requirements for operation at rated conditions.
3.1.7 Duty. - The duty of motors shall be continuous, intermittent, varying, or short-time as specified
(see 6.1).
duty. - Motors rated for continuous duty shall carry rated load continuously at the
3.1.7.1 Continuous
ambient temperature specified (see 6.1) without exceeding allowable temperature rises (see table IX and
6.2.1).
3.1.7.2 Intermittent duty. - Motors rated for intermittent duty shall carry rated load for the time
duration which will permit operation of the motor indefinitely at the ambient temperature and the cycle of
load, no- load, and rest specified (see 6.1) without exceeding the allowable temperature rises (see table
IX and 6.2. 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 will be required.
3.1.7.3 Varying duty. - Motors rated for varying duty shall carry rated load for the time duration which
will permit operation of the motor indefinitely at the ambient temperature and the cycle of varying loads
specified (see 6.1) without exceeding allowable temperature rises (see table IX and 6.2.3).
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