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Question about Vitamaster treadmill motor - Page 2

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Posted by mike on December 12, 2014, 2:43 am
On 12/11/2014 11:15 AM, Paul Dudley wrote:

This is third hand from memory, but,
There was a guy in Oregon who started with garbage disposal
motors and changed the magnets for more output.

Posted by amdx on December 13, 2014, 4:30 am
On 12/11/2014 1:15 PM, Paul Dudley wrote:

  Depending on the size of your propeller, you could go to the junk yard
and get an alternator from a car. If you are at all resourceful, you can  
probably come up with an alternator without spending any dollars, there  
are literally millions around. I don't mean steal it, someone around you  
is junking a car.
  How big is your prop? How about a Savonius rotor? Keeps everything  
near ground, easy to work on.
  Here are a few examples,   http://tinyurl.com/ngw5pbm  
  Give us an idea of what power you plan on generating, is a 1000 watts
max enough? A 100 amp alternator will do that.
Find some average wind speed maps for your area, get some info to start  
working with.

Posted by clare on December 13, 2014, 5:38 am

An automotive alternator requires pretty high RPM, which necessitates
a SMALL "prop" to get the speed without the tips going supersonic -
and not enough "disc area" toproduce enough torque to generate more
than a few watts.

Posted by Vaughn on December 13, 2014, 3:35 pm
 On 12/13/2014 12:38 AM, clare@snyder.on.ca wrote:

  Not only that, unless modified with strong field magnets, they require  
a hefty excitation current.  In general, unmodified auto alternators are  
useless for home/hobby-sized wind power.

Connected to a suitable small engine though, they can make a great  
emergency battery charger.

Posted by clare on December 13, 2014, 4:30 pm

Which still require significant RPM to generate any appreciable power.

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