motor conversion-part 2

[bart]

  hello again and thank you in advance for your help and advice.

previous story here:  http://www.fieldlines.com/story/2008/2/18/183413/959

   decided to remove pvc, epoxy, and mags from 4-pole error and coverted to a 6-pole, w/ 2 rows of 6 mags per pole (thanks tecker). mags are 1/2 dia.x 1/2 thick, n-50. poles are skewed and feel very slight cogging.

   testing was done through a vfd drive to a 3 phase 1725 motor , through a belt reduction shaft, to the converted motor. wired in star to 2 of otherpowers 35 amp bridge rectifers and then into a 90 amp hour deep cycle battery.

   am sure there was some belt slippage, as i could not test at 60 hz with out belts coming off. jerry-rigged test stand, made to accommodate different testing scenarios. gorgeous day and did not want to waste an hour getting brother-in-laws rpm meter.

     53 rpm  .5amp  12.68dcv  .3amp  9acv

    105       1.7        13.5        1.1       11

    158       2.4        14.6        1.8       13.3

    211       3.5        15.5        2.5       14.1

    263       4.5        16.0        3.2       14.5

   not sure if the pvc as a cage is going to work as it was getting warm, not hot. does have epoxy paste packed between rotor and i.d. of pvc.

   where am i headed with this?

   - have a 36v golf cart i'd like to be able to charge w/ something.

   - would like to know about what what size blades would match this.

     does not have to necessarily be for the golf cart.

   - been toying w/ the idea of a lenz 2 w/ another one of these conversions, one on

     top, another on the bottom ( thanks vawtman). any idea on size?

  if more info needed, please ask.

  all comments welcome

   

[vawtman]

Hi Bart

 The idea of twin conversions on a vawt belongs to Tom and Zubbly.Would be an interesting project.

 What is that last column measuring?

Glad it's working better for you.

Mark

[bart]

  good morning. gave credit to you as i believe you commented on it in a other thread.

last column is the ac volts per phase, with the amps per phase preceding it.

[vawtman]

Did you do an o.c(open circuit) test on it?If not would be cool to see what you get between any 2 leads at those rpms.

[bart]

  no, thought an o.c. test did not convey any worth while info.

but here you go, as it was not hard to do:

               53 rpm    20 dcv    12 acv

              105          42           28

              158          64           45

              211          86           61

              263        107           78  

[vawtman]

Well Bart it looks like you gotta great vawt alternator there.Cutin to 12v around 70 rpms or less.Unless i'm wrong.

 For o.c you would only measure a.c.

[oztules]

odd I make it about 33-35 rpm for 12v system

......oztules

[bart]

  that's great guys as that was what i was hoping for. any idea on size of vawt? i like to go with the lenz 2.

i could get really carried away with this as i've been saving 3 huge blower shafts from old trane roof top units.

  they measure 92" long at 3 1/2" dia. and taper to 2 3/16" for the bearings, which i saved also. realize that this is to big for the current conversion, but ideas on what size motor to convert for these would be nice. have several different 3 phase motors from 1 hp to 20 hp. probably a different story here.

  a vawt would better suit my needs, as i don't think a tower, for a hawt, would be worth the cost and dealing with getting it to pass code. on 10 acres and am surrounded by trees about 55' tall.

[elvin1949]

 Me to.

later

Elvin