How to generate a magnetic field

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SUMMARY

The discussion focuses on generating a magnetic field of intensity approximately 10 kA/m using a 1 mm copper wire coil powered by a 12V DC, 18 amp maximum power supply. Key issues identified include overheating of the solenoid, short-circuiting of the power supply, and the effectiveness of the coil's design with 100 turns and 10 layers. Solutions proposed include using a current-limiting power supply, adding resistors to the circuit, and considering larger wire to reduce resistance and heat generation.

PREREQUISITES
  • Understanding of electromagnetic theory and solenoid design
  • Familiarity with Ohm's Law and resistance calculations
  • Knowledge of electrical components such as resistors and power supplies
  • Experience with thermal management techniques in electrical systems
NEXT STEPS
  • Research "Calculating magnetic field strength in solenoids" using resources like HyperPhysics
  • Learn about "Current limiting power supplies" and their applications
  • Investigate "Thermal management techniques for electrical coils" including cooling methods
  • Explore "Wire gauge selection for reducing resistance in coils" and its impact on performance
USEFUL FOR

Electrical engineers, hobbyists in electromagnetism, and anyone involved in designing or troubleshooting solenoids and magnetic field generation systems.

androsidhom
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dear all
i am trying to generate a magnetic field of intensity about 10 k A/m i have i 1 mm copper wire and a power supply 12v DC 18 amp max, i am winding the coil about 100 turn- 10 layers ( each layer with two ends)
the first problem that the coil heats up, also the resistance of the each layer is about 1.2 Ω and when i connect the solenoid to the power supply it makes a short circuit to the power supply
my questions are
1- is this no of turns and the amp available is sufficient to generate this intenisty of the magnetic field?
2- how to over come the short circuiting of the power supply?
3- how to over come the over heating of the solenoid?
4- is it much better to make the solenoid all connected together without separating each layer?
 
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1. This link should get you the equations and stuff you need to calculate your field. http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html#c3

2. You could try adding a resistor in the circuit or using a current limiting power supply.

3. Less current will reduce the heating, as would using a larger wire, as that would decrease the resistance. If you have no choice you could try to force air over it with a fan or water cool it. (Warning, be VERY careful about using water cooling to avoid a short.)

4. I'm not sure what you mean. Why are the layers separated? Is your wire coated with an insulating material, or are you using bare copper wire?
 

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