electromagnetic lock design

felix_cat

great ideas there !

why i was designing for continuous power ? Because this lock is for home use where you have to lock the door usually at night but perhaps i might want to rethink it. Another reason is that i saw these magnetic locks on the internet and they work the same way. Check the link below

http://images.google.com.pk/imgres?i...D1280%26um%3D1

So give it a final thought. I would do as you say because you got more experience on your side. One think more, you think the lock would last an hour running on rechargeable battery ?

negitron

Definitely you do NOT want a fail-closed door lock for home use. For one thing, it'd be a fire code violation. So, the permanent magnet idea put forth earlier is right out. Your idea could work, but you better be sure of the reliability of your construction; if the coil opens or the power is interrupted for any reason, your door is wide open.

felix_cat

eerrr .... you talk about fire codes ....... we don't have fire alarms here ...

berkeman

Well, he also means for basic life safety. I'm assuming the electronic lock is only for access from the outside. From the inside, the door opens with just a turn of the knob, correct?

felix_cat

well kind of .. like i said , there are going to be two button behind the door, one for lock and the other for unlock. You can have a knob to pull the door open .....

berkeman

The behind-the-door ability to exit needs to be 100% mechanical. Quiz Question -- why?

felix_cat

bro ... if you're wondering the 'behind the door' buttons to malfunction, just pull the plug out and the doors open ...

i hate quizzes though .. aint that sharp ....

berkeman

Not sure I understand your point (and not sure I want to be in a building that you have designed the electronic locks for...).

A big part of being a good engineer is thinking ahead. Safety is a huge part of what you do as a design engineer. If I gave you an interview question to describe to me an electronic door lock mechanism and system, and you fed me what you have posted in this thread, what do you think would happen?

Quiz Question -- Why?

felix_cat

cmon dude ... dont be that harsh ... ive read your post again ...
look yours idea changes my design. I am not making a mechanical lock, its a MAGNETIC LOCK. My design is similar to those that are out there in the market. I gave the link too. I mean guys making those kinda locks aint fooling around .. are they ? .. or are the designs so flawed that they are marketing on the internet ?

I am trying to make one thing different. Normal Maglocks open when entered the right password. Close automatically when the door swings back (door swing back is automatic too). These are the one's which i saw at a university i went to. The different thing im doing is that my design provides security from the outside but easily open from the inside. To make that happen I have to insert 'behind the door' control. AND i am not making the actuator solenoid lock thingys, its a purely MAGNETIC LOCK , no mechanics involved. Please stick to my design if you can ... and i hope i aint getting on your nerves cuz from the way your last post sounded ..... :S :$

dlgoff

I don't think you're getting on berkemans nerves. What he is concerned about is safety. Note the rules about posting about dangerous activities: Physics Forums Global Guidelines
We don't want to see someone get locked in when there's a fire and the door won't open.

felix_cat

berkman ... im a newbie . ... lets face it ... i dont have answers to ur so called 'quiz questions', rather dealing me with sarcasm you could have some positive attitude and help me. Im in my 5th semester here, not working for a company like you.
I just asked you to help me make a friggin solenoid. thats it .... and my design wont let any one lock em self up. YOU can just pull the plug out and the MAGNETISM IS HISTORY ... for godsake ...

and you josh cum here and sayin ... "we got rules mister. no one dies burning in the fire with a faulty design ... we don help peeple make that kinda stuff here" .... WELL for crying out loud im not making such a thing. Skeptic gave the stupid idea for the PERMANENT magnet design... thats how u make peeple locked in PERMANENTLY... i think i wasted my time coming here on the forums .. buncha fyzists .. buh !

felix_cat

close this thread cuz i aint comin back

berkeman

I ask Quiz Questions all the time, son. It's a teaching/learning tool. As I mentioned earlier, a big part of learning to be a good engineer is learning to optimize your designs. And another part of real-world engineering is thinking about safety and reliability in your designs. You'll come to understand that as you continue in your engineering eductaion.

felix_cat

Well I have got a lot of text warnings. Sorry for my disrespectful attitude Sir.

My request to you is just to look at the following link and explain the structure and design. It would be very thankful,grateful,utmost kind of you.

http://www.sdcsecurity.com/shared/eb..._datasheet.pdf

This is the lock. Please explain why has he not coiled the solenoid directly on to the iron core rather he uses some black material. Could you kindly explain what that black material is and why the solenoid is coiled onto that. Give your guess of the dimensions of the core too.

And the reason why quiz questions are irritating is that you reply the answer to them very late. The other person has project deadlines to meet with if you are not aware.

Regards

berkeman

Sorry, I'm not able to understand that pamplet with just a quick look. Maybe others are able to understand it...

felix_cat

Then do not take a quick look please . this is the forums , you have to help others, give time to them , come on , this is not fair. Berkeman, help please .....
This is a burning issue on forums, not a single forum on the internet deals with designing the electromagnet properly, you have to answer for the sake of science.

Maria2009

I'm very interested! I would love to find out more inforamtion related to this topic. Thanks in advance.
me too, I need more detailed info

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