I am in the process of building an electric generator for the first time, and I have found out most of what I need to do, except the following things.

  1. Can I have 2 rows of magnets linked together side by side spinning around the stator?

    a. If possible does this change the recommended size of the inner diameter of my coil? (I read it's suppose to be about the width of my magnet)

This is the type of generator i'm building. >https://www.youtube.com/watch?v=yuKKrVlilVk Right at the beginning the video shows a rotor with 1 row of magnets going around it. I am wondering if I can add another row of magnets side by side going around the wheel.

So the wheel would look like this.


I am wondering if a positive and negative going across the wire at the same time would like cancel each other out or something.

  • \$\begingroup\$ Precisely what is "electromagnetic generator"? \$\endgroup\$
    – Andy aka
    May 11, 2014 at 12:53
  • 1
    \$\begingroup\$ Ok maybe I'm adding extras to the term that make it incorrect. But what I am building is an electric generator. I added magnetic to the it thinking that it still means generating electricity using magnets. \$\endgroup\$ May 11, 2014 at 13:21
  • \$\begingroup\$ Much useful information here : practicalaction.org/docs/energy/pmg_manual.pdf \$\endgroup\$
    – user16324
    May 11, 2014 at 15:23
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    \$\begingroup\$ @BrianDrummond Thanx for the article. It did contain some useful information, however it wasn't able to answer my questions since I am actually building a different type of generator. I just posted a link to what it looks like in my main post. If anyone could give me the name for that type of generator i'd appreciate it! \$\endgroup\$ May 11, 2014 at 18:33
  • \$\begingroup\$ That thing is weird looking, but I think the most accurate name for it might be a multiphase permanent magnet alternator. I didn't see the entire construction but that seems to be where it's headed. Personally, I think I would have hacked an automotive alternator with some kind of a belt drive. \$\endgroup\$
    – user39962
    May 12, 2014 at 0:32

1 Answer 1


You can add more magnets, but they have to be aligned with the first row, meaning if the first row is +-+-, after adding the second row it should look like

This increases the strength of the magnetic field, which means more electricity is generated. Alternatively, you could use stronger magnets, which will accomplish the same thing.

  • \$\begingroup\$ Thanks for the answer! I thought that might be the case wasn't sure though. I guess I won't be using two rows then since that would require a lot of work to get the neo mag's I have to stay close together. \$\endgroup\$ May 12, 2014 at 22:44
  • \$\begingroup\$ @bluegman991 You could try stacking the magnets on top of each other to increase their strength. That would generate more electricity without you having to worry about keeping the magnets apart. I tried that once; glue covered rare earth magnets moving around will stick to anything and make a mess. \$\endgroup\$
    – Delta1X
    May 13, 2014 at 0:58
  • \$\begingroup\$ Yea. I am thinking of either doing that or just making a generator with 1 stator on each side of the rotor. \$\endgroup\$ May 14, 2014 at 1:35
  • \$\begingroup\$ @bluegman991 Have fun building it! \$\endgroup\$
    – Delta1X
    May 14, 2014 at 12:34

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