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Treadmill Motor PVC Blades | 49 comments (49 topical, editorial)

Re: Treadmill Motor PVC Blades (3.00 / 0) (#4)
by packman1234 on Tue Aug 5th, 2008 at 04:09:34 PM MST
(User Info) packman1234

Thanks to both of you for the replies!!

I want to do the second set of blades right..I have to comment first on Roadrangers reply. When I got to the part in the instructions for making the blades, I followed this link and made them from six inch pvc cut at 29.75 length and divided into two 150 degree pieces and one 60 degree piece..... http://www.thekevdog.com/projects/wind_generator/

My holes on the hub are 1" apart and 1 7/8 from the shaft center.

This Generator spins CLOCKWISE because I got negative voltage readings going Counterclockwise. Are the Instructions you gave me correct for the info I just revealed?? Can you also tell me how you arrived at the cut-in speed of 480rpm for my machine- I'm learning and am confused at all the reading I've done!

How many watts can I get out of this and is this motor feasible for this project?

I did not finish this by any means...Just set it on a stand to see if it spins before proceeding to the next level.

To CmeBrew---
The blades seem balanced fine..They do not stop at the same spot when spinning it manually.

I really appreciate the help-Just need a little bit more to keep going!

Bob

Re: Treadmill Motor PVC Blades (3.00 / 0) (#5)
by packman1234 on Tue Aug 5th, 2008 at 04:13:05 PM MST
(User Info) packman1234

I did upload a picture to help you guys.. It is in my user info, I beleive...

[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#6)
by TomW on Tue Aug 5th, 2008 at 04:37:12 PM MST
(User Info)

Rob;

This Generator spins CLOCKWISE because I got negative voltage readings going Counterclockwise.

If it is a brushed motor just reverse the leads. Unless I missed something.

Use its negative as a positive. That way direction of rotation matters not. Just use the "most positive" lead as your positive lead. Or feed it into the AC side of a bridge rectifier and it will just be right on the DC side of that.

Tom.

"Education consists mainly of what we have unlearned."--Mark Twain
[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#7)
by packman1234 on Tue Aug 5th, 2008 at 06:29:53 PM MST
(User Info) packman1234

Tom

Dont get me all confused!!
Is it ok to have this unit spin clockwise? The new design of my blades will determine this..The voltage readings I get make no difference when reversing leads and spinning it clockwise and counterclockwise.

Bob

[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#8)
by roadranger (Road Ranger at G Mail dot com) on Tue Aug 5th, 2008 at 07:00:45 PM MST
(User Info)

The "original" motor has a flywheel/fan on the shaft that is screwed on with a left handed thread. If you mount a "clockwise" rotor on it it will unscrew and fall off when you "load" the motor. I don't know how your motor is?

[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#10)
by TomW on Tue Aug 5th, 2008 at 07:23:21 PM MST
(User Info)

Bob;

I am speaking from purely an electrical standpoint.

I do not know the motor and another poster notes their could be mechanical issues with reversing it.

Not sure what you mean by "The voltage readings I get make no difference when reversing leads and spinning it clockwise and counterclockwise."? If the polarity of the voltage does not change with reversing directions then something else is going on. It is not easy to get a handle on what a poster understands.

Sorry I even jumped in.

Sorry to confuse you. Really.

Tom

"Education consists mainly of what we have unlearned."--Mark Twain
[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#9)
by roadranger (Road Ranger at G Mail dot com) on Tue Aug 5th, 2008 at 07:19:54 PM MST
(User Info)

For a good guess at the cut-in of your motor I took the "original" 260V 5000rpm motor's documented 375rpm cut-in and corrected it for the different voltage and rpm of yours:
( 375rpm / ( 5000rpm / 260V ) ) * ( 3200rpm / 130V ) = 480rpm

[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#11)
by roadranger (Road Ranger at G Mail dot com) on Tue Aug 5th, 2008 at 07:35:27 PM MST
(User Info)

You can - of course - change the mounting hole positions lengthwise along the blade to match your hub and adjust the length at the root to give you exactly 24" tip to center of hub. The positioning of the holes at 3/4" in from the trailing edge is critical to get the right angles along the blade. It is also very important to sharpen the blade only on the inside of the pipe (toward the wind) to get the proper angle of the blade.

[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#12)
by roadranger (Road Ranger at G Mail dot com) on Tue Aug 5th, 2008 at 07:53:38 PM MST
(User Info)

As for the suitability of this motor - if you are in a high wind area (20-30mph) it would be OK with a proper 4' rotor. In a 10-20mph area I think you'd be better off with a 3' rotor (for more rpms) and look for max 40watts at 20mph, maybe 5-10w at 10mph? To scale the blade down for a 3' rotor multiply the lengthwise measurements (distances in from the tip for each "mark") by 2/3 but leave the width measurements as-is.

[ Parent ]

Treadmill Motor PVC Blades | 49 comments (49 topical, 0 editorial)

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