MIL-DTL-17060G(SH)
4.6.12 Load test (induction motors only). With the motor operating at rated voltage and frequency,
simultaneous measurements of each line to line voltage, frequency, amperes in each phase, rotational speed, and
input watts shall be taken at 0, ¼, ½, ¾, 4/4 and 5/4 of rated hp. The hp load may be determined by current or watt
input or by torque. The motor shall be at approximately its normal operating temperature during these tests.
4.6.13 Phase characteristic (synchronous motors only).
4.6.13.1 No-1oad test. The no-load test consists of taking a series of measurements of armature amperes, field
amperes, and field voltage as the field current is varied from zero to a value that produces 150 percent of rated
armature amperes. A measurement of amperes in all phases shall be taken with zero field. Sufficient measurements
to plot a "vee curve", that is, armature amperes against field amperes, shall be taken. The watts input at the
minimum value of stator amperes shall check the sum of the stator copper, core, friction, and windage losses. This
test shall be conducted at rated voltage and rated frequency.
4.6.13.2 Load characteristics test. The load characteristics test shall be similar to the no-load test except that
measurements need not be obtained for zero field. Unless otherwise specified (see 6.2), this test shall be conducted
under rated load conditions.
4.6.14 Inclined operation (sleeve bearing and oil lubricated ball bearing motors only). Under each of the
positions of inclination specified in 4.6.14.1 and 4.6.14.2, the motor shall be run for a period of not less than 30
minutes for surface ship motors and 1 hour for submarine motors. This test may be made on the combined motor
and driven auxiliary. The motor or combined motor-driven auxiliary shall be run at not less than its maximum
service speed, and the driven auxiliary need not be loaded. During the progress of these tests it shall be ascertained
that the mechanical balance is as good as it was in the normal horizontal position, that there is no pounding or
grinding at the bearings, and that the lubrication is satisfactory. If the motor is provided with oil-ring lubrication, it
shall be ascertained that the rings do not rub or strike against the sides or ends of the oil well, that they do not
"dance" or show pronounced irregularity of movement, and that the shaft does not sling oil into the motor. For
submarine motors, the bearing or lubricating oil temperature at the completion of test shall be measured.
Additionally, the suitability of the motor for operation when a ship is rolling 45 degrees for surface ships and 60
degrees for submarine motors to either side shall be determined by inspection of design.
4.6.14.1 Horizontal motors. The inclination test positions for horizontal motors shall be as follows:
a.
Surface ship motors:
(1) Shaft inclined 15 degrees, front end low
(2) Shaft inclined 15 degrees, rear end low
(3) Shaft horizontal, motor base tilted 15 degrees to the right
(4) Shaft horizontal, motor base tilted 15 degrees to the left
b. Submarine motor inclination test shall be the same as in 4.6.14.1a except that inclinations shall be 45
degrees.
4.6.14.2 Vertical motors. Vertical motors shall be tested by inclining them to an angle of 15 degrees for
surface ship motors and 45 degrees for submarine motors from their normal position, in any direction (that direction
which imposes the most severe condition, if there is any dissymmetry) and for a period of 30 minutes for surface
ship motors and 1 hour for submarine motors. This test may be made on the combined unit used for the special
operating test. Vertical motor-driven auxiliaries shall be tested by inclining them to an angle of 15 degrees for
surface ship units and 45 degrees for submarine units from their normal position, in each of four different directions;
namely, forward, backward, to the right, and to the left. Observations shall be made as specified in 4.6.14 for
horizontal motors and combined motor-driven auxiliaries.
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