Recent content by Zeusex

We measure precisely the force needed to detach the metallic valve from the bracket. I know that this is not a real measurement of the magnetic field but all I care is the force for detachment in this application.

Alright, some update. We ordered some symmetric brackets, which much tighter holes for the pin (core) and also, with pin diameter slightly larger so that the radial gap between pin and bobbin is about 0.1mm. These changes solved the lower magnetic field on the bracket. Thanks.

Brackets I have are from 1010, 1020 and SS430. 2mm thick. Laser cut blanks and then bent. I know that cold work on steels and stainless steels increases the magnetism. I will have to explore the Wiegand sensor and how I can use it to solve the problem.

Yes same gauge (0.24mm), pure copper and enamelled. Core (pin) is from 1010, also tried 1020, SS430 and a random iron bolt I found. 1010 and 1020 pins were more magnetic than the rest. Brackets I have are also from 1010, 1020 and SS430. With Pin of 1010/1020, I notice that the magnetic...

Measured the amps on our coil, it is same as the reference, 0.45A. Tried the bolt, but the pin made of 1010 was more magnetic compared to bolt. But at the bracket, the magnetic forces are lower. Any more ideas? I think that the bracket needs to be symmetrical. Next week we can try to build and...

1010 is a mild steel too which is why we selected it.. I don't know what grade is the bolt I found, hopefully A36

Thanks. Tomorrow I will try to replace the pin with a cheap iron bolt. How close the bolt diameter to be in relation to inner diameter of the bobbin?

Can there be a shorted turn in the coil and yet the overall resistance be as needed?

Alright. I used the same power supply for both magnets. This power supply can delivery upto 10A. We tried 1010 steel, SS430 and did not observe any difference.

Bracket is not symmetric at both ends of bobbin. Can this cause magnetic field leak and make the magnet weaker by ten times?

DC 12V. Yes wire gauge is same (0.24mm). Reference consumes 0.45A. I haven't measured what our coil consumes yet. I can measure tomorrow. Resistance of the both coils are same which is 25 ohms.

Hi Guys We are a bunch a mechanical engineers trying to build a simple electromagnet. Our design is based on a very similar magnet. However, our version is about 10 times less magnetic and we are wondering why. Our coil has exactly same length, same number of layers and turns. What is possibly...

Hi, would you mind if I share my experimental data here? Thanks