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Finally starting plans on a new genny! | 16 comments (16 topical, editorial)

Re: Finally starting plans on a new genny! (3.00 / 0) (#7)
by Jeff (ruralmcguyver at yahoo dot com) on Sun Aug 3rd, 2008 at 03:38:13 PM MST
(User Info)

8-3-08
I've updated just about everything. It's nice to have AutoCad and draw things to scale so you can get a real idea of how things will fit.

To start with, when I changed magnets and drew the thing up, I realized I needed to use the smaller "pan" for the rotor. There's several reasons, but the main two are cost for magnets, and the spacing of them. The smaller pan is also slightly heavier gage... 13 gage, about 0.09" thick.
I didn't go with the 2" by 1" by ½" coated magnets per Hugh Piggot's choice due to clearance problems on the 1 ½" lip of the rotor. Instead, I'm thinking of these 1 ½" long by ¾" wide by ¼' thick ones.

http://www.magnet4less.com/product_info.php?products_id=48

    I wish they had them in ½" thickness, oh well. These will be mounted length-wise on the diameter, and will give me better spacing when I eventually add an inner rotor. They're only 29lb. pull through the ¼" thickness. Think they'll be enough having 24 of them on each rotor?
    I'm going to have to bite the bullet & make some real coils, so I added a detail for them also. Keeping in mind the size of the rotor, and number of mags/coils, it's time to seriously consider the gage wire. I do need to keep the voltage in the 110-140 range due to the length of run from the genny, and I'd like to be able to use the 14-3 UHMW wire on hand for that. Hopefully it will be in the 50-75ft. range, but I have 100ft. of it.
    I don't suppose I'd be lucky enough to be able to use this same wire to make coils with? Or is this another silly, newbie question?

Here's some updated drawings:

Rural McG

Re: Finally starting plans on a new genny! (3.00 / 0) (#8)
by electrondady1 on Tue Aug 5th, 2008 at 03:21:46 PM MST
(User Info)

jeff,
the mags you are talking about using are way too powerful to put on your rotor.
if you google search the board i think you will find that 1/4"plate is about the minimum you can use for 1/2" thick neo mags.
as well, if you use very wide magnets they will not sit properly on the curved surface of your rotor.
thats why i suggested using a lot of smaller mags.
you can make up for the reduced flux density with a greater pole count .

[ Parent ]

Re: Finally starting plans on a new genny! (3.00 / 0) (#9)
by Jeff (ruralmcguyver at yahoo dot com) on Tue Aug 5th, 2008 at 05:30:39 PM MST
(User Info)

Thanks. I figured I would have to add a plate behind the mag anyway after your first comment. That info is in the 20-some pages I've copied & saved for this project. I just don't remember all of it right off the bat. The little space behind the mag-backing plate with the 1 3/8" mags is 0.024". 1 1/2" wide mags would leave a 0.03" gap. At the thickness of the "pan", I wouldn't be surprised if it pulled the surface flat, LOL! Really though, I already thought of that, it's a nice place for JB Weld to hold the mag in place.

Good news! I have two motors, both are 220v and one is from the same clothes dryer. They both have 14ga. magnet wire in the coils! If it works out OK, I'll have to scrounge up a couple more to make all those coils! Obviously, I'll only be making 1 to start out with, but at least that's a lot closer to the ideal gage.
Rural McG
[ Parent ]

Finally starting plans on a new genny! | 16 comments (16 topical, 0 editorial)

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