Electromagnets Questions

1.what is the maximum load to be pulled by the electromagnet

it can pull even in tones also but need strong current.So dont worry it will work for your application also.

2.does it need cooling when operated

it purely depends on your design concept. Normaly no cooling is require for magnets but heat sinks are needed for current transfering usinit specialy transformers and semiconductor controller (drivers).

3.how much time can i connect it to the supply

Now a day electromagnets are available for continuous duty also.

we can also design it for above.

4.what is the effect of dust and the metal suface roughness on its performance

Normaly insulation is coded in the coil itself. So nothing will happen to system. Performance wise also it will not affect more, Your application is only lifting means no problem, at the same time continuous hammering means it may show variation.

5.what is its effect on the nearby electronic devices and motors

Surely it will affect. Ex: computer screen may go dim and color may change.

6.what are the precautions and any notes must be considered when using it

Remove all electromagnetic particles away from it or keep away your magnet away from there.

7.which is better to buy it or to make it

you want exact load means design it. you have tollarance means buy. My sugestion is buy two and take one for your exprement and one for your learning the design and make it own in future (Because time also a consider in projects).

8.from where could it be bought knowing that i am in egypt "but i can call for importing"

http://www.electromechanicsonline.com/

9.about how much would it cost

Better you mail them your requirement and ask it.

send a line of reply.

All the best for your project.

K.P.Mahalingam

(mahalingam_kpm@yahoo.co.in)

Electrical Engineer,

INDIA - south

The mass of the drawers is no problem at all, but the distance between the magnet and the drawer could well be a project killer.

Since the lines of magnetic force complete a "circuit" between the opposing poles, the distance at which you can apply force between the magnet and the attracted object (typically steel) is severely limited.

If the magnet is in contact with the drawer, and then you are pulling it, the task is simple, as 25 kg bond strength is trivial for an electromagnet.

More information please.

Greg

I thought you were supposed to do your own research and calculations for graduation projects. For example it shouldn't take you long to measure the force needed to shut the drawer... If, having done the groundwork, you need help on an individual detail, that would be fine