Overview
Closeup |
Metal vapor is produced from the contacts of a switching gear during cutoff
and a plasma arc forms. The structure of the contact rings is innovated
to produce a magnetic field that expands the arc and prevents vacuum deposition
caused by the arc. The arc expands by the Lorentz force that is produced.
This example presents the use of a magnetic field analysis to obtain the
current density and Lorentz force of the switching gear and the force expanding
the arc. |
Lorentz Force
Closeup |
The direction of the Lorentz force that is produced in the arc is indicated
in Fig. 1. A 6.0 N force is acting at -51.4 degrees from the X-axis through
the center of the arc. |
Current Density Distribution/Magnetic Flux Density Distribution
| The vector plot of the current density distribution is indicated in Fig.
2 and the contour plot of the magnetic flux density distribution of the
arc's cross-section is indicated in Fig. 3. The magnetic flux in Fig. 3
is produced by the current flowing in the cup indicated in Fig. 2. The
magnetic flux density is larger to the upper left than the lower right
from the center of the arc. Therefore, the force is produced from the upper
left to the lower right. |
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