Help to make a solenoid/Electromagnet.

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SUMMARY

This discussion focuses on constructing an electromagnet with a maximum diameter of 20mm, utilizing a 10mm diameter iron core that is 20mm long. Key considerations include selecting the appropriate wire gauge, determining the number of turns (N), and calculating the current (I) to achieve a magnetic induction of 1 to 1.2 Tesla. The voltage required can be derived using Ohm's Law (V = R * I), where resistance (R) is calculated based on the wire's length and cross-sectional area. Additionally, the operational mode of the magnet (constant or pulsed) will influence power consumption and thermal management.

PREREQUISITES
  • Understanding of electromagnetism principles, specifically the relationship between turns (N), current (I), and magnetic induction (B-field).
  • Knowledge of wire gauge selection and its impact on resistance and current capacity.
  • Familiarity with Ohm's Law and basic electrical calculations.
  • Awareness of thermal management in electromagnets, including mean-power consumption.
NEXT STEPS
  • Research wire gauge selection for electromagnets, focusing on AWG standards.
  • Learn about calculating the resistance of wire based on length and cross-sectional area.
  • Explore methods for measuring and controlling the temperature of electromagnets during operation.
  • Investigate the effects of different operational modes (constant vs. pulsed) on electromagnet performance.
USEFUL FOR

Electronics engineers, hobbyists building electromagnets, and anyone interested in the practical applications of electromagnetism in devices.

Shahryar
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I need to make an electromagnet with maximum 20mm dia including winding.
I have an iron core of 10mm dia and 20mm length.

I can't decide
- which wire to choose,
- what no. of turns should i provide
- how much current should i pass through the wire.
- what should be the voltage.

Any help and advice will be highly appreciated.
Thank you
 
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Shahryar said:
- what no. of turns should i provide
- how much current should i pass through the wire.
Don't think of N and I separately. Think of N*I = some constant, which induces a constant magnetic induction ( B-field with the unit [Tesla] ).
How many Tesla do you want? ( I will suggest 1 - 1,2 Tesla max. ).
Shahryar said:
- which wire to choose,
Make some sketch of the cross section of the magnet: The area of the coil must be kept within your given limits: 20mm dia * 20mm length.
Shahryar said:
- what should be the voltage.
Calculate the length of the wire. Knowing the cross section area of the wire you can calculate the resistance of the wire.
V = R * I

The rest: Will the magnet be switched on constantly or on/off ( how much mean-power will it consume, what will its temperature be? ).
 

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