Magnetic circuits with air gaps, Electrical Engineering

The creation of a magnetic field in a ring may need to be accessed by means of an air gap. This is typically used to apply the magnetic field to a current carrying conductor to produce a force - e.g. in an electric motor.]

Consider therefore, a ring with an air gap present.  

1190_Magnetic circuit with air gap.png

Note that since the flux lines are continuous, the flux density in the air gap and the ring will be the same. 

2341_Magnetic circuit with air gap1.png

However, the air gap represents a much larger reluctance to the flux than the high µ ring, so for the same magneto-motive force, the flux density in the ring will be reduced significantly compared to the case when no air gap was present.

Posted Date: 8/27/2012 5:21:06 AM | Location : United States

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