Overview
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One method of printing is to use a roller heated by induction heating.
The heated printer roller rotates, melting the toner, and then transfer
the melted toner to the paper. It is important that the roller is heated
evenly.
This introduces the use of coupled magnetic field analysis and thermal
analysis to evaluate the eddy current loss density distribution, temperature
distribution, and temperature variation when the roller is rotating. |
Eddy Current Density Distribution
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The eddy current loss distribution density of the printer roller is indicated
in Fig. 1. The magnetic field generated by the coil produces eddy currents
on the surface of the printer roller. The eddy currents are distributed
on the surface of the printer roller due to a skin effect, which is stronger
at high-frequencies. |
Temperature Distribution and Temperature Variation
The temperature distribution and temperature variation of the printer roller
are indicated in Fig. 2 and Fig. 3. Fig. 3.4 indicates the temperature
variation of the printer roller at the measuring points shown in Fig. 3.2.
The measuring points are selected to evaluate the temperature variations
in the circumferential direction and in the axis direction. The roller
is normally analyzed by heating the printer roller to a temperature of
approximately 200 degrees Celsius, but, the printer roller is only analyzed
for one full revolution in this analysis.
The area of the printer roller surface heated by the rotation of the roller
is indicated in Fig. 2. The temperature increases in the area being heated
are fairly even in the axis direction of the roller, as indicated in Fig.
3. On the other hand, the temperature is not distributed evenly in the
circumferential direction due to timing differences in heating, and heat
dissipation into the air. The coil geometry also causes a terraced rise
in temperature because the middle of the printer roller is not generating
heat. |
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