A few electromagnet questions?

Question

1. Is there risk of electric shock when making an electromagnet. All this "current" buisness has me thinking this thing is a giant van de graph generator.

2. For the iron core, where would I go to find a nice thick iron rod?

3. Which matters more for the strength of the field: length of iron core or thickness?

4. Will I know before hand what the magnetic poles (N,S) are on my magnet? How do I find this out before hand?

Answer 1

<p><br /> Hello a thank you in advance to my questions.<br /> How many time a second can an electromagnet pulse, without getting hot?</p> <p>This is a 1,000 pound pull / and the polarity is changed to where it will have the push effect.<br /> I'm interested in having this electromagnet on the push polarity.<br /> My question is how many times a second can this electromagnet pulse?</p> <p>Also does the nature of this type of electromagnet loose it's push {pulse power} upon the pulses per second it will make?</p> <p>I'm turning a flywheel, that has three 1,000 pound permanent magnets evenly spaced, embedded in a tight pocket into an aluminum ring to confine it's magnetism power from any steel contact interference.  The 1,000-pound permanent magnets will have the repelling side. {North Pole side}  I am in need for this electromagnet to rotate this flywheel by having the electromagnet spaced 1/8 of an inch between the permanent magnet and the electromagnet itself. <br /> This electromagnet has a requirement of only 7.8 Watts {less than one amp} @ 12 volt power.<br /> So how many time a second can this electromagnet pulse without getting hot?<br /> And Or will it even get hot?  / With only 7.8 Watts {such little amperage?}<br /> Do you see any other obstructions or obstacles that would interfere to this type of drive operation?<br /> I would appreciate your personal input to my questions.<br /> Please answer my questions directly, and please be specific.<br /> Thank you again<br /> &nbsp;</p>