Overview
Closeup |
A drive shaft is an axel to transfer power from the engine to the tire
for rotation, so it needs to be strong enough against torsion. To protect
the drive shaft from torsion, wear and fatigue, the high-frequency induction
heating is widely used as one of the surface hardening methods in terms
of strength and cost.
In JMAG, the eddy current loss density distribution obtained from magnetic
field analysis can be used as a heat source for thermal analysis.
This note presents the use of coupled magnetic field analysis and thermal
analysis to obtain the temperature distribution of the drive shaft. |
Eddy Current Loss Density Distribution
Closeup |
Figure 1 shows the eddy current loss density distribution of the drive
shaft.
The magnetic field generated by the coil produces the eddy currents on
the surface of the drive shaft. Magnetizing properties change in the part
of the drive shaft where the temperature exceeds the Curie temperature
by the induction heating. As a result, the relative permeability and the
electric conductivity become smaller, causing the decrease of the eddy
current loss density. From the cross-section view, eddy current loss density
distribution is also seen inside the drive shaft. |
Temperature Distribution
Figure 2 shows the temperature distribution of the drive shaft.
When the drive shaft is rotated, the surface of the drive shaft facing
the coil is heated uniformly in the circumferential direction.
From the cross-section view of the drive shaft, only the surface reaches
high temperature due to the skin effect. |
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