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

Re: Treadmill Motor PVC Blades (3.00 / 0) (#20)
by Baling Wire on Wed Aug 6th, 2008 at 07:25:43 PM MST
(User Info)

I have an "Image" treadmill motor that is very similar. I believe that your 12.2 volt cut-in will be close to 440 rpms based on the ratings of my motor. They have quite abit of brush drag and the HEAVY fan/hub do NOT contribute to it starting easily. A lot of weight in that hub to get moving from stop!

You will be hard-pressed to get any charge under 10-11 mph due to the higher cut-in rpm. 300-350 rpm at cut-in would be much better. I would get a much lighter hub and try the pvc blades at the 54" diameter you have. If after the hub change, it starts alot better, then you might look into changing the blade design a little? Pvc blades may not "turn-up" enough rpms to make it work for you. A good 4.5 to 5 ft. dia. Fast wooden prop might? work out ok. Good luck!

BW
73 de ke5yd

Re: Treadmill Motor PVC Blades (3.00 / 0) (#22)
by packman1234 on Wed Aug 6th, 2008 at 08:02:23 PM MST
(User Info) packman1234

Baling

Thanks for the encouragement!
Did you ever get the "Image" you have to work with a lighter hub?
Where would I find a hub like that to fit on the shaft?
How light would you go if I could get someone to make me one?

Now that I cut the blade length to 24", I'd like to start there(Made no difference in my testing whatsoever)

I am NOT giving up on this...I will have a BIGTIME smile just getting this thing to spin! I am pretty frustrated at this point though.

Should i keep the motor or try something else to get my spirits up?

Thanks
Bob

[ Parent ]

Re: Treadmill Motor PVC Blades (3.00 / 0) (#24)
by roadranger (Road Ranger at G Mail dot com) on Wed Aug 6th, 2008 at 08:06:49 PM MST
(User Info)

A lot of brush drag could be a problem but a heavy hub shouldn't be. My "originally spec'd" motor has a very heavy fan/flywheel and works fine - but I am tempted to cut off the fan blades and thin it out a bit in the lathe to reduce the weight of the 'mill. I don't remember if you checked to see if the motor had less brush drag in one direction - some do. My motor turns easily with some cogging but not too bad.

[ Parent ]

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

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