General Questions and Answers
The following table is a CALCULATED heat loss for the various motor sizes, based on the
following: Motor is in still air, ambient temperature of the air is 20° C, motor
temperature is stabilized at 50° C above ambient (70° C). Mechanical
envelope of the motor is the same as the Empire Magnetics IN- series motors.
In typical applications, these figures can vary greatly, mechanical mountings provide
conduction paths which are not included in these calculations while vacuum applications
remove the convection pathways. The type of drive, the winding configurations, the
duty cycle, the current settings and other environmental issues affect the actual motor
heating. These numbers are only intended to provide general information, they are
not specifications and there is no assurances that they are applicable to a customer
controlled situation.
..Motor.. |
Total Heat
Loss (W) |
Convection
Heat Loss (W) |
Radiation
Heat Loss (W) |
Convection
Coefficient, h (W/m2K) |
U11 |
2.10 |
1.74 |
0.36 |
7.08 |
U17-1 |
3.00 |
2.44 |
0.55 |
6.47 |
U17-2 |
3.69 |
3.01 |
0.68 |
6.47 |
U21 |
5.58 |
4.51 |
1.08 |
6.14 |
U22 |
7.53 |
6.08 |
1.45 |
6.14 |
U23 |
9.13 |
7.37 |
1.76 |
6.14 |
U31 |
10.49 |
8.36 |
2.12 |
5.78 |
U32 |
13.48 |
10.75 |
2.73 |
5.78 |
U33 |
17.23 |
13.74 |
3.49 |
5.78 |
U41 |
23.22 |
18.41 |
4.81 |
5.62 |
U42 |
29.55 |
23.43 |
6.12 |
5.62 |
U44 |
35.88 |
28.45 |
7.43 |
5.62 |
P61 |
50.55 |
39.65 |
10.91 |
5.34 |
P62 |
63.42 |
49.74 |
13.68 |
5.34 |
P63 |
76.86 |
60.28 |
16.58 |
5.34 |
... |
... |
... |
... |
... |
For test data on the motors, see temperature curves for
specific frame sizes.
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