TheBackShed.com

Forum Index : Windmills : what type of motor to use

Author

Message

goboats
Newbie

Joined: 13/03/2008
Location: Canada
Posts: 2

Posted: 09:44pm 12 Mar 2008

Copy link to clipboard

Print this post

Hello folks just found your board and im a noob.Im enthused about wind and solar and am looking to build a small scale turbine(maybe 5 ft blades) just to charge a couple deep cycle marine batteries at my cabin for use with an inverter and have good wind .Bin surfing alot and still need info.Seems to be lots for sale on ebay but im leary ,the pm motors seem to be the best to use. http://cgi.ebay.com/INDIANA-GENERAL-30-VDC-PM-MOTOR-FOR-WIND -GENERATOR_W0QQitemZ290213262758QQihZ019QQcategoryZ121837QQs sPageNameZWDVWQQrdZ1QQcmdZViewItem
For instance how big of blades do i need for this one;ty

KiwiJohn
Guru

Joined: 01/12/2005
Location: New Zealand
Posts: 691

Posted: 06:32pm 13 Mar 2008

Copy link to clipboard

Print this post

Hi, that motor looks a good place to start. Your 5ft blades (i.e. 10 ft diameter) would be more than adequate I expect.

Of course you cant just mount the blades on front of the motor as the motor bearings would never last and you need to protect the motor. I used a motor similar to that with a single bearing to support the blades and about 10 inches of shaft coupled with a piece of rubber hose to the motor (which was inside a shelter). It worked well and last time I saw the present owner he was still enthusing about it using it at a remote site to keep batteries topped up for some computer equipment.

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 10:18pm 13 Mar 2008

Copy link to clipboard

Print this post

Hi jg,

you should contact the ebay seller and ask for clear details from the nameplate on the motor.

I could only read 30V. there appears to be duty cycle power output etc.

This is a brushed motor, with 4 brushes. There will probably be 4 ceramic magnets bonded to the stator. I would expect <100W as a direct drive windmll generator. A 5 foot blade may be overkill. To get 9V when spinning the shaft with fingers indicates a high volts per 1000 RPM rating.

The 5/8" shaft is too thin to mount a hub and blades, so KiwiJohn's suggestion would be appropriate. Keyed shafts are prone to seizure, maintenance could be a problem down the track.

Post more details if they are provided.

cheers, Gordon.

become more energy aware

goboats
Newbie

Joined: 13/03/2008
Location: Canada
Posts: 2

Posted: 01:06pm 14 Mar 2008

Copy link to clipboard

Print this post

Hey guys thanks very much for the info,im going ask for more details before i bid on it ,i assumed the pm motors had no brushes just magnets,still learning.And the blades for it might be more like 3 feet long

Print this page

To reply to this topic, you need to log in.