I am making a powerful electromagnet for repulsion for my project. I made some electromagnets with iron core diameter of 1 cm, 1.5 cm and 2 cm for each 6 cm and 8 cm length. Different gauge enameled copper wire I used is 0.42 mm, 0.70 mm and 1.0 mm. Winding width is 1 cm for each electromagnet. The end result is an electromagnet with 2 cm x 8 cm dimension with 1.0 mm wire gauge is the most powerful of all. But still not enough for what I want.
Now I am going to experiment with using 4 cm, 6 cm, and 8 cm diameter iron core of 8 cm length.
My question is: is there any rule/what is rule to decide winding dimensions in relation with core dimensions? As I used 1 cm winding diameter with wire of 1.0 mm and 2 cm diameter core. Will increasing the winding diameter say using 1.5 cm winding instead of 1 cm on an increased 4 cm diameter core will make a more powerful electromagnet?
I am also thinking to make an electromagnet with this same dimension as of my current best electromagnet (i.e. 2 cm x 8 cm with 1.0 mm wire gauge) using bifiliar winding (winding with two wires together and attach the ends) to compare both. As I read winding this way decreases overall resistance of wire, input more amperes & increases power of electromagnet. Any comment about this ?
I find this one online simulator for air core online electromagnet calculator. It's very helpful for finding resistance of coil and number of turns for cored EM too. Is there any such simulator available for electromagnets with core?