Polarity switching electromagnet

[dorker]

I want to make an electromagnet to rapidly switch polarity back and forth. I hear the core should be made of laminated iron to avoid heat losses; is this correct? Where could I get one such core from, and is there anything else I should consider?

 

[DarioC]

Well since power transformers are laminated and do switch polarity efficiently, I would suggest you look around for surplus, burned out or otherwise unwanted power transformers and take your parts from that. (you can use the copper wire if you can get it out in usable lengths.) AC electric motors have laminated cores also.

You are familiar with the problems involved in driving an inductive device with a switched signal with a fast rise time?

DC

 

[dorker]

You are familiar with the problems involved in driving an inductive device with a switched signal with a fast rise time?

Eddy currents and heat losses? Is there anything else?

 

[NascentOxygen]

Eddy currents and heat losses? Is there anything else?

In a circuit with inductance, current exhibits a reluctance to undergo any rapid changes. The more rapidly you try to make it change, the more stubborn it becomes.

The inductor equation, v=L.di/dt shows that if you want a high value of di/dt, you have to apply a high v.

 

[alphy]

Yes, using a laminated iron core is a common practice in designing polarity switching electromagnets. This is because laminated iron has lower eddy current losses, which can reduce heat generation and improve the efficiency of the electromagnet.

You can purchase laminated iron cores from various suppliers, including online retailers and specialty stores that sell materials for building electromagnets. It is important to ensure that the core you choose is the correct size and shape for your specific application.

In addition to the core material, you should also consider the size and shape of the electromagnet coils, the strength and frequency of the switching, and the power source you will be using. It is important to carefully plan and design your electromagnet to ensure optimal performance and safety. I recommend consulting with a knowledgeable engineer or conducting thorough research before building your polarity switching electromagnet.