Turn control using magnetic actuator?

I don't really understand what you mean!

Do you mean a turn indicator like in an car (automobile) to light up a lamp?

Look up Reed Relays, these are small switches which close when a magnet is close to them.

Could you provide a drawing or picture of the thing? This turn actuator is only part of something you're building, I believe. Could you share with us what it is? It might help us understand what you need.

and

and

yes offcourse.

first of all sorry it took me awhile to answer. I had to travel to another city for acouple of days. anyway this is the picture of magnatic acuator which you can buy in us(I think), but here in denmark you the only way of getting one is to order it from the internet(so much that i know).

Anyway i decided to build my own(It should be easy right!?), but until now noon of them that i have made works.

I have this formula :

B=4 * P * 10(-7) * k * n * I

B is the Magnatic Field Strengh!!

Someone please help me.

What shal i do to make it work. I have found some text on the internet about that, but i read and then try again without any help yet..........

So it's a control for a model plane then!

Okay, using an electromagnetic actuator sounds like it's feasible but I'm not a model plane hobbyist so I may not be very qualified to give an answer. I'll try anyway.

The rod connects to the control surface. In your picture above, this should connect to the rudder. The rod has a magnet in the center (not shown, it's under the coil).

You put a voltage through the coil. The polarity determines whether the rod moves to the left or to the right and how much voltage determines how far it moves.

The spring ensures that the rod will return to the center position when you remove the voltage from the coil.

That being said, I admire your desire to do-it-yourself (DIY). This project of yours will need a lot of tweaking and experimentation to determine how many turns of coil you need and how much voltage will be required. It's quite possible that your coil may become quite large as to be too heavy for the plane.

One solution would be to use one of those neodymium magnets which have lots of magnet power per size. Then you may need less turns and a smaller size wire.

To the model plane hobbyists out there. Any other suggestions?

Hi again, and thank you very much.

First i would like to say, that in this creazy word of ours there should be more

people like you. I dont know you, but your response was so incoraging that it

warmed my hart(sorry the spelling).

Back to the Acuator....

I think my mistake was i used to fat(" ") wire, and to little turn.

I have made a new one last night, with around 300-400 rounds, which

I am going to try today(I hope it works...).

The one you suggested is good, but its going to be to havy for my plain.

i maybe use it later on different projects... So thank you anyway.

Bishi

Dear Vulcan

Or anybody....

Ok, this is the time which i start pulling my hair.

As you know i couldnt get my acuator to work. I Opened a fan from a computer, and the wire was thin(thiner than hair), so i thought that this should do the trick, because before i used a wire slightly fater(Bigger, from a hard disk drive).

I was shore that this time this works(Around 300-400 rounds).

But no, I used different batteries but no. I even used a Ac to Dc Transformater

(An old Transformatter for a Nokia telephone 6volt).

Someone please tell me what is it i am doing wrong ?!!?

Any Srgestions?????

Bishi

seek and you shall find

To the new beginers, just try and if i can i am shore you can too.

A little bit of Ohm Lov. and some math. everything suddently gets so

easy(the light became Clear).

Thank you anyway for taking the time to direct me in the right direction.

There is a very good Pdf file (search for magnetic acuator controls).

have fun.

until next time

Bishi.

It sounds like you're trying to make an electromagnetic actuator. Are you trying to use the magnetic field from the coil to pull an iron rod? If so, it would help if you wound your cabling around a hollow, non-magnetic object (e.g. a plastic pipe) and placed your iron rod (and return spring, if you're using one) in the pipe. Magnetic material such as steel pipes will shield your rod from the magnetic field, preventing your actuator from working.

I gess the question i should be asking is.

If i am using a 1.5 V (or maybe more if needed) with 750 mA batteri, what shall i do and how shall i make my acuator so that it works with my power bank????

Help please...

any sugestion will be deeply apreshiated.

thank you very much in advanced.

Yours Greatfully

Bishi

I'm not a model plane guy, and have not seen the Selman magnetic actuators, so I may be off on this one. I believe what I see is a coil with a magnet having a vertical axis of rotation inside the coil. If so, the magnet needs to be oriented with its field (usually along the axis for cylindrical magnets) perpendicular to the axis of the coil. The magnet and its attached lever arm will try to line up with the electromagnet's field whenever a current is present. Assuming there is some restoring force (one or more springs, rubber bands, or even airflow when flying), the amount of rotation will be proportional to the current flow, and of course the direction of rotation will depend on the direction of the current.

I just tried it, using a small (5mm dia) rare earth magnet, a 1.5 V 'C' battery, and a single turn of wire. It worked fine! Of course a single turn has such low resistance that it would deplete the battery very quickly, and would not be easily controlled by a remote control system. On the other hand, 400 turns of very small wire might have such high resistance that not enough current would flow.

My suspicion is that you simply had the magnet in the wrong orientation.

Good Luck

Dick

Surely a good place to start is using a small DC relay rated at the voltage you want to use!

If you look at the relay you will see how it exerts the force over a very small distance, but it has a large number of turns on a steel core.

You may well be able to dissmantle it and get the coil off so that you can experiment with it.

Good luck

Del