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armature rewinding
By snake, Section Newbies Posted on Wed Oct 14, 2009 at 10:03:59 AM MST
rewinding armature

hi friends,i have a permanent magnet motor and is rated at 6750rpm,130vdc,18.5 amps,2 magnets motor.i want to use it as a wind turbine for my 12v system but due to the high rpm,i believe that it will never reach cut in without any type of gearing which i dont want to use.
i have decided to rewing the armature myself with thinner wire gauge but with more turns
i did a small research on dc motor rewinding and found this
http://www.scootersupport.com/motorrewind.htm
i think it will be useful guide to rewinding.
i want to get 15v at 300rpm and max amps from the new rewinding
what do you think and advise guys?
thanks

armature rewinding | 5 comments (5 topical)

Re: armature rewinding (3.00 / 0) (#1)
by ghurd on Wed Oct 14, 2009 at 12:25:45 PM MST

I think that is a big job. Probably a lot bigger than you think.
Need to get over double the turns in there, which means the wire will be a lot smaller gauge, meaning the output will be a LOT less.
That would be a big job.

Will need to get some voltage vs RPM numbers before you start.
Some motors like that just do not make the voltage it seems they should. If the voltage is less than expected, I always figured it was due to poor magnets, and something with poor magnets would certainly not be worth the effort.

Fungus rewired an Ametek a while ago. It would be worth looking up his story.
G-
Ghurd.info

Re: armature rewinding (3.00 / 0) (#2)
by snake on Wed Oct 14, 2009 at 12:59:39 PM MST

the armature is approx 6"-7" and 3"-4" diameter..if ever i am rewinding it with 0.6mm,2 strads wire,do you think it will be ok?i took a look at the armature,the wire size is big but the turns are few.

Re: armature rewinding (3.00 / 0) (#3)
by Flux on Wed Oct 14, 2009 at 01:12:41 PM MST

As ghurd said you will require about twice as many turns of 1/2 csa wire ( 3 awg less).

This will halve the current capability of the original winding. If it was a machine wound armature and you are an inexperienced hand winder then you may need to go down even more on wire size to get it in the space. Don't underestimate the problems of connecting to the commutator as it will almost certainly be a staked connection and somehow you are going to have to solder it.

Follow the original winding pattern and make sure you have the same coil to commutator spacings or you will shift the brush axis.

Good luck, it's possible but you could build an axial flux alternator for far less effort and have a far better end product.

Flux

[ Parent ]

Re: armature rewinding (3.00 / 0) (#4)
by ghurd on Wed Oct 14, 2009 at 01:36:42 PM MST

The motor could be used as-is, for an efficient 12V fan or Ped-Gen.

Might try something smaller/cheaper/easier to replace first?
Possibly a car heater blower motor, which will be the same thing but smaller.

Be a Lot easier to jamb a bunch of neos in the washing machine motor with a hacksaw, file and epoxy than trying to rewind a motor like that.
G-
Ghurd.info
[ Parent ]

Re: armature rewinding (3.00 / 0) (#5)
by hiker on Fri Oct 16, 2009 at 12:47:40 AM MST

if you have the time--why not....
if it works out..great!
i always wanted to try it..takes me forever and a day to figure out something new..
even thou its in black and white-brain short-...............
WILD IN ALASKA

armature rewinding | 5 comments (5 topical)

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