Overview
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The importance of measures to handle heat is increasing as motors become
more efficient with higher performance. Therefore, the thermal flow of
the motor needs to be obtained.
A thermal analysis can be performed in JMAG using the loss density distribution
obtained in the magnetic field analysis as the heat sources for the thermal
analysis.
This example presents the use of a coupled magnetic field and thermal analysis
to obtain the temperature distribution and temperature variations of the
entire phase motor. |
Loss
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The losses of each part is indicated in Table 1. The losses of the coil
are the main source of heat because they are relatively large. |
Temperature Distribution at a Steady State
The temperature distribution at a steady state is indicated in Fig. 1.
The heat is transformed from the coil to the parts around the coil as indicated
by the results. |
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Temperature Variations of Each Part
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The points the temperature is measured and the temperature variations of
each part are indicated in Fig. 2.
The temperature of each part settles in the steady stat, as indicated by
Fig. 2. |
Consecutive Operating Time and Average Torque with Various Currents
The average torque and temperature variations of the coil when an analysis
is performed using 3 times the rated current to increase the average torque
to more than 1.0 Nm are indicated in Table 2 and Fig. 3.
Although increasing the current produces higher torque, the temperature
exceeds the its heat resistance of 180 degrees Celsius after operating
the motor for 23 minutes.
The characteristics and limitations of the motor can be understood in more
detail by performing a coupled magnetic field and thermal analysis. |
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