What could be causing unexpected results in my magnetic circuit?

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SUMMARY

The forum discussion centers on unexpected results in a magnetic circuit designed by a user named Cahane, utilizing a C core with an air gap and 1018 steel. Despite calculations and simulations performed with FEMM software yielding consistent results, the physical testing revealed significantly lower magnetic field strength than anticipated. Key factors affecting the results include the size of the air gap relative to the pole tip width, which influences the magnetic field strength calculated using the formula B = μ0NI/h, where NI represents amp-turns, h is the gap height, and μ0 is the permeability of free space.

PREREQUISITES
  • Understanding of magnetic circuit design principles
  • Familiarity with FEMM software for magnetic simulations
  • Knowledge of material properties, specifically 1018 steel
  • Basic grasp of electromagnetic theory, including the formula B = μ0NI/h
NEXT STEPS
  • Investigate the effects of air gap size on magnetic field strength in circuits
  • Explore advanced features of FEMM software for more accurate simulations
  • Learn about the magnetic properties of different materials beyond 1018 steel
  • Study the impact of pole tip geometry on magnetic circuit performance
USEFUL FOR

Engineers and designers working on magnetic circuits, materials scientists, and anyone involved in electromagnetic simulation and testing will benefit from this discussion.

Cahane
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Hello,

I have designed a magnetic circuit.. C core with an air gap. I calculated the circuit as well as doing a simulation on it using FEMM software. The core is from 1018 steel. My calculation and simulation gave almost similar result.. So, there is no problem in my calculation or simulation. The problem is, when I tested the magnetic circuit.. the result is very different (low than I expected).. Can somebody suggest or give the suggestion on where when wrong? Is there anything that I should consider?

Thanks,
Cahane
 
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Could you please post a drawing of the electromagnet?

Very roughly, if the gap is small relative to the pole tip width, the magnetic field in the gap should be about

B = μ0NI/h Tesla

where NI = amp-turns, h = gap height, and μ0 = 4π x 10-7 Henrys per meter.

Bob S
 

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