electromagnetic lock

[davidbenjamindix]

i am trying to build an electromagnetic lock with 1/2" x 1/8" Neodymium N45 magnets. here is a simple diagram for what i'm trying to do. i need any suggestions, input, or ideas related to this problem.

 

[4pyros]

OK what is it for. If it is spining all the time the batterys will run out fast. You may be beyond the laws of physics with this one. Andy

 

[blueroomelectronics]

You can read more about magnetic motors like the one above here.
The Museum of Unworkable Devices

 

[4pyros]

You can read more about magnetic motors like the one above here.
The Museum of Unworkable Devices

Nice one LOL

 

[blueroomelectronics]

My guess is the OP is doing an art project.

 

[4pyros]

Anyones guess is good at this point

 

[davidbenjamindix]

nice reply on the nonworkable devices. lol. this would be used for a homemade lock for my lockbox. (it's not completed yet...just the walls and base are completed)
**broken link removed**

the mechanism will actually open and close a drawer. turning one way will open the drawer (very small drawer), the other way will close the drawer. the screw mechanism will act as a crank.

there wouldn't have to be constant power.

 

[4pyros]

OK you need to elaberate on your intent. Will you flip the disk? Looks like you are just trying to make a pancake motor. Its not a lock but a actuator. Andy

 

[davidbenjamindix]

i would rather not flip the disc, but change the polarity. i sure do like to make things more complicated than they really are. i should just use previous suggestions and buy an actuator or H motor. i may also just use the drive from a cd/dvd player.

 

[4pyros]

David; Pancake motors are vary weak and have vary low tork. You would need some complicated timing to switch the coils. Look them up but thay probly will not do what you want. Andy

 

[davidbenjamindix]

im scrapping this idea completely. to get the effect i want, i've completely changed the design and gone with a much more efficient way of achieving success. to open my drawer, im using a spring mechanism that latches shut with the neodymium magnetic bar. a solenoid will release the magnetic bar, shoving the drawer open. i'll have to manually close the drawer and reset the lock, but that's fine.

 

[blueroomelectronics]

You might want to take a look at Google Sketchup. Great for quick 3D designs. Free too.

 

[RMMM]

You will be using alot of power to keep the lock closed.

Consider using a mechanical method,like a cash register drawer. nice, easy, and secure. (And already designed and cheap to buy)

 

[Boncuk]

To open and close a small drawer I suggest to make the drawer spring loaded and lock it with a pulling solenoid.

Small cash boxes are normally made that way, which I used in my shop. I made an adapter circuit for the serial interface of my PC and every time the final input was made the solenoid was triggered opening the drawer.

The solenoid does not have to be strong (power consumption) since it just has to unlock the drawer.

Boncuk

 

[davidbenjamindix]

thanks blueroomelectronics (Bill), i will use that next time i sketch off of paper.

RMMM, thanks, someone else also mentioned that would be a good idea.

Boncuk, can you post a series photo of your cashbox with the solenoid in action?