MIL-DTL-17060G(SH)
3.6.6.2.2 Two-speed design B7 motors. Breakdown torque requirements for both speeds of two-speed design
B7 motors shall be as specified in table XII. Locked-rotor current, locked-rotor torque, and pull-up torque for both
speeds of two-speed design B7 motors shall be as specified in the following:
a.
Locked-rotor current shall be not greater than the values in table XII by more than 5 percent.
b.
Locked-rotor and pull-up torque shall be not less than 70 percent of full-load torque.
3.6.6.2.3 Multispeed motors of more than two speeds. Motors with more than two speeds shall, for the highest
and lowest speeds, meet the requirements of 3.6.6.2.1 or 3.6.6.2.2, as applicable. When required, locked-rotor
current and torque requirements for all speeds, between highest and lowest, shall be as specified (see 6.2).
TABLE XII. Locked-rotor current, locked-rotor torque, pull-up torque, and
breakdown torque for multispeed motors, design B.
1-winding 2-speed
(2-, 4-, 6-, 8-, 10-, and 12-pole)
Speed characteristics
Constant torque
Variable torque
Constant hp
Locked-rotor current (maximum)
High speed
10 percent over table XI
20 percent over table XI
10 percent over table XI
Low speed
10 percent over table XI
10 percent over table XI
10 percent over table XI
Locked-rotor torque (percent full-load torque) (minimum)
High speed
table IX
table IX
120
Low speed
table IX
100
table IX
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
table VIII
175
Low speed
table VIII
150
table VIII
Slip (percent) (maximum) 1/
High speed
5
5
5
Low speed
5
5
5
2-winding 2-speed
(2-, 4-, 6-, 8-, 10-, and 12-pole)
Speed characteristics
Constant torque
Variable torque
Constant hp
Locked-rotor current (maximum)
High speed
10 percent over table XI
10 percent over table XI
10 percent over table XI
Low speed
10 percent over table XI
10 percent over table XI
10 percent over table XI
Locked-rotor torque (percent full-load torque) (minimum)
High speed
table IX
table IX
table IX
Low speed
table IX
table IX
table IX
33
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