Speed Sensor (TR)
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Overview |
| This example shows the analysis of a speed sensor.The number of revolutions of the rotary ring is detected from voltage signals produced by a pickup coil. The magnetic flux generated in the magnet reaches the rotary ring through the core (See Figure 1). Both core and rotary ring are made of magnetic material. Since the rotary ring is serrated like a gear, when it rotates, the distance from the core varies, changing the permeance of the magnetic circuit. This in turn changes the magnetic flux passing through the core, producing an electromagnetic force. The JMAG circuit feature enables the voltage signals to be output directly with the shape of coil and the number of coil turns considered (See Figure 2). In this analysis, the patch meshing feature is used to deal with three-dimensional motion (See Figure 3). Figure 4 is an animation of the magnetic flux density varying with rotation. |  Figure 1 - Magnetic flux reaches the rotary ring through the core |
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| Figure 2 -
Output signals Enlarged View |
Figure 3 -
Patch meshing Enlarged View |
Animation of magnetic flux varying with rotation This is an animation of the magnetic flux varying with rotation. For a
more detailed view, see the full animation file (216 kB). |
