MIL-DTL-17060G(SH)
TABLE XIV. Maximum temperature rises (°C) and measurement method. 1/
6/
104 °F
122 °F
149 °F
158 °F
176 °F
Maximum ambient temperature
(40 °C)
(50 °C)
(65 °C)
(70 °C)
(80 °C)
Insulation Class 7/
F
F
F
H
N
F
H
N
H
N
Item
Motor part
1
Windings other than those in item 4:
176
158
131
176
221
122
167
212
149
194
(a) Dripproof protected, fan cooled
and air over enclosures. Method 2 3/
(80)
(70)
(55)
(80)
(105)
(50)
(75)
(100)
(65)
(90)
(b) Others. Method 2 3/
185
167
140
185
230
131
176
221
158
203
(85)
(75)
(60)
(85)
(110)
(55)
(80)
(105)
(70)
(95)
Cores and mechanical parts in
2
contact with or adjacent to the
insulation:
(a) Motors in 1(a). Method 1 2/
158
140
113
158
203
104
149
194
131
176
(70)
(60)
(45)
(70)
(95)
(40)
(65)
(90)
(55)
(80)
(b) Motors in 1(b). Method 1 2/
167
149
122
167
212
113
158
203
140
185
(75)
(65)
(50)
(75)
(100)
(45)
(70)
(95)
(60)
(85)
Bare copper winding and single layer
3
field windings with exposed
uninsulated surfaces:
(a) Motor in 1(a). Method 1 2/
176
158
131
176
221
122
167
212
149
194
(80)
(70)
(55)
(80)
(105)
(50)
(75)
(100)
(65)
(90)
(b) Motors in 1(b). Method 1 2/
185
167
140
185
230
131
176
221
158
203
(85)
(75)
(60)
(85)
(110)
(55)
(80)
(105)
(70)
(95)
Bearing, ball 5/. Method 1 or 3 2/
4/
122
104
95
104
68
4
(50)
(40)
(35)
(30)
(20)
Bearing, sleeve 5/. Method 3 4/
122
104
--------
--------
--------
(50)
(40)
Bearing oil sump. Method 1 or 3 2/
4/
104
104
--------
--------
--------
(40)
(30)
NOTES:
1/
Squirrel-cage and mechanical parts (such as pole tips) may attain such temperatures as will not injure the motor in any
respect.
2/
As determined by temperature measurement Method 1 of MIL-E-917.
3/
As determined by temperature measurement Method 2 of MIL-E-917.
4/
As determined by temperature measurement Method 3 of MIL-E-917.
5/
Bearing temperatures measured on bearing outer ring or Babbitt.
6/
For VSD motors operating at minimum speed, add 5 degrees to the temperature rise limits.
7/
Insulation class per MIL-E-917.
36
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