MIL-DTL-17060G(SH)
3.6.9 Phase characteristic (synchronous motors). The load and no-load phase characteristic shall be in
accordance with that established by the first article test (see 4.6.13).
3.6.10 Inclined operation. The mechanical balance of the motor shall not change, no pounding or grinding of
the bearings shall occur, and the lubrication system shall meet the requirements of 3.6.2 (see 4.6.14).
3.6.11 Temperature rise. The requirements of 3.6.11.1 through 3.6.11.5 shall apply, as applicable (see 4.6.16).
3.6.11.1 Continuous duty. Motors rated for continuous duty (see 3.5.1.6) shall carry rated load continuously at
the ambient temperature specified (see 3.5.1.3) without exceeding the allowable temperature rises in table XIV.
3.6.11.2 Intermittent duty. Motors rated for intermittent duty (see 6.6.4.2) 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 3.5.1.6) without exceeding the allowable temperature rises in table XIV. 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 and duty cycle requirements shall be required.
3.6.11.3 Varying duty. Motors rated for varying duty (see 6.6.4.3) shall carry rated load for the time duration
which will permit indefinite operation of the motor at the ambient temperature and the cycle of varying loads
3.6.11.4 Short-time duty. Motors rated for short-time duty (see 6.6.4.4) shall carry rated load which, starting at
the ambient temperature, can be carried constantly for the period specified (see 3.5.1.6) without exceeding allowable
temperature rises in table XIV.
3.6.11.5 VSD motors. VSD motors shall comply with the following requirements, as applicable:
3.6.11.5.1 VSD motors operated without a VSD. VSD motors in accordance with 3.5.2.8.2 shall meet 3.6.11.1
or 3.6.11.3, as applicable, without a VSD, with 60 hertz power applied at a voltage per 3.5.1.2 (a) or (b).
3.6.11.5.2 VSD motors operated with a VSD. VSD motors in accordance with 3.5.2.8.2 shall meet 3.6.11.1 or
3.6.11.3, as applicable, when operated with a VSD. For continuous duty operation per 3.6.11.1 or varying duty
operation, per 3.6.11.3, unless otherwise specified in 6.2, the applicable speed shall be the base speed and the rated
load shall be the load at base speed for the auxiliary.
3.6.11.5.3 VSD motors with constant torque applications operated with a VSD. In addition to 3.6.11.5.1 and
3.6.11.5.2, VSD motors for constant torque applications shall meet table XIV when operated with a VSD at
minimum operating speed at the resulting load requirement
3.6.11.5.4 VSD motors not in accordance with 3.5.2.8.2. VSD motors not in accordance with 3.5.2.8.2 shall
meet 3.6.11.1 through 3.6.11.4, as applicable, when operated in accordance with the defined duty cycle with a VSD.
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