MIL-DTL-17060G(SH)
TABLE XII. Locked-rotor current, locked-rotor torque, pull-up torque, and breakdown
torque for multispeed motors, design B - Continued.
2-winding 2-speed
(2-, 4-, 6-, 8-, 10-, and 12-pole)
Speed characteristics
Constant torque
Variable torque
Constant hp
Pull-up torque (percent full-load torque) (minimum)
High speed
100
100
100
Low speed
100
100
100
Breakdown torque (percent full-load torque) (minimum)
High speed
table VIII
90 percent of table VIII
90 percent of table VIII
Low speed
table VIII
table VIII
table VIII
Slip (percent) (maximum) 1/
High speed
5
5
5
Low speed
5
5
5
NOTE:
1/
For 2-, 4-, 6-, and 8-pole only.
3.6.7 Synchronous motors. Synchronous motors shall make two starts in succession without damage to any
part. Torques with rated voltage applied at rated frequency shall be not less than the percentages of full-load torque
specified in table XIII.
3.6.8 Load performance (synchronous motors). The load performance shall be in accordance with that
established by the first article test (see 4.6.13.2).
TABLE XIII. Normal torques synchronous motors.
Pull-in 1/ 2/
Pull-out 2/
Power factor
Speed
Locked-rotor
hp
(see 6.6.18)
(see 6.6.19)
(see 6.6.20)
(r/min)
500 to 1800
200 and below
1.0
100
100
150
150 and below
0.8
100
100
175
250 to 1000
1.0
60
60
150
200 to 1000
0.8
60
60
175
1.0
40
60
150
1250 and larger
0.8
40
60
175
1.0
40
30
150
450 and below
All ratings
0.8
40
30
200
NOTES:
1/
Based on normal WK2 of load.
2/
With rated exciting current applied.
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