I am attempting to help a friend build a magnetic crane demonstation... My background is not in magnetism so I need some advice...
All we want the crane to do is lift a object off the floor and move it to another part of the room and drop it. We are limited on power supply (do not know where we will show and tell this thing), so we are trying the following;
The crane will have a DC electromagnet on it. The object will have a permanent magnet on it, this way to lift we will not need power. To release we will just pulse the electromagnet and repel the PM.
My Questions are as follows:
1. Is there a possibility we will demagnetize the PM? If so how can we avoid this?
2. How do you guess-ta-mate the required size of the EM and PM?
3. What material can we use for the core of the EM and the PM itself to insure they do not break, yet keep strength up and hopefully costs down?
Any suggestions are always appreciated!