Overview
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A constant velocity joint is located on both ends of the drive shaft in
the drive system of a car.
The high-frequency induction heating may be used to harden the inner ball
track inside the outer ring of the constant velocity joint, because the
inner ball track is directly in contact with the steal ball and the roller
on the side of the inner ring.
It is important to take account of temperature rise and the timing of it
inside of the heated object for designing of induction heat system such
as high-frequency hardening.
In JMAG, the loss distribution obtained from magnetic field analysis can
be used as a heat source for thermal analysis to obtain the temperature
distribution and the temperature variation caused by high-frequency induction
heating.
This note presents the use of a coupled magnetic field analysis and thermal
analysis to obtain temperature distribution for the outer ring of the constant
velocity joint. |
Joule Loss Density Distribution
Closeup |
Figure 1 shows the Joule loss density distribution in the outer ring. The
eddy current is produced on the outer ring by the time-varying magnetic
field generated by the coil. In the induction heating, this eddy current
is used as the heat source. When the high frequency is used, eddy currents
are induced on the surface of the outer ring due to the skin effect. |
Temperature Distribution
Figure 2 shows the temperature distribution of the outer ring. The outer
ring is heated by the eddy current, and the temperature rises over time.
After 2 seconds, most part of the inner surface of the outer ring reaches
the Curie point, 800 Celsius, but the temperature distribution is not uniform.
Some improvements, including the modification of the coil geometry, are
required to heat the inner surface of the outer ring uniformly.
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