Author Topic: Conversion Question  (Read 1310 times)

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behoof

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Conversion Question
« on: October 22, 2009, 09:46:06 PM »
Regarding the Baldor 3hp 3ph conversion I made and crashed a little while ago? See it at:


http://pics.ww.com/v/Behoof/WindGen+Baldor/arm-skip4.jpg.html


http://www.fieldlines.com/story/2009/10/4/165310/803


 Well, I found a possible replacement that has been rewound for 575 Volts 3.3hp 3ph that if he gets back to me might be the exact case I need to put my salvaged magnet rotor in.


My question is this: are there any problems that you could see with using this rewound motor over the original. I'm sure that I should be able to clip it and add the three more leads I'd want?


If this appears to be a good choice, what sort of performance changes do you see? Probably not much I'd guess but I defer to the experts.


Just to refresh, I saved the mag rotor from the crashed jenny.


The Baldor specs on both of these motors are exact in every number on each plate but still waiting for some measurements and such from the owner before purchase.


http://www.baldor.com/products/specs.asp?1=1&competitor=Lincoln&catalog=VM3611T&product=



AC+Motors&family=General+Purpose|vw_ACMotors_GeneralPurpose&winding=35WGY334&rating=40CM



B-CONT


Thanks for viewing and best to you all,

behoof

« Last Edit: October 22, 2009, 09:46:06 PM by (unknown) »
They're in the wire!!

TroubledGus

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Re: Conversion Question
« Reply #1 on: October 24, 2009, 01:31:05 PM »
Zubly ( nice fellow who passed away ) did a lot of work on magnet conversions.


If I was going to rewind something like this I would probably just remove all the copper and make a few test coils up to see what you get for a given rpm.


In particular I migh also try changing not just the runs ratio but the span on the coils to see if any particular combination worked better for you

« Last Edit: October 24, 2009, 01:31:05 PM by TroubledGus »

Flux

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Re: Conversion Question
« Reply #2 on: October 25, 2009, 01:22:18 AM »
If you want the best results then rewinding is the way to go.


Most people seem to go for motor conversions because they don't want to wind. If you have to use an existing winding then you have to hack it about and reconnect as it will have too many turns in its simplest star connected form.


The standard N American winding needs to be reconnected for several voltages and if you break one star connection and bring out some leads you have a lot of options for reconnecting, so it is very versatile but very confusing. I personally would rather rewind than unscramble that lot but that is another issue.


Machines designed for the European market only need star delta connections to suit the supply voltages and the winding is far less versatile to reconnect for low voltage.


I am not familiar with the 575v machine but I suspect it is Canadian and it will be a simple winding with no reconnection intended. You will not very likely have the options of the many reconnection and probably if it is star you will have the same choices as a European one. If the original winding is delta you will have no options that are useful to you.


Unless you are prepared to get in there and chop it about into pole groups and reconnect them in parallel it may be very limited indeed.


If it is identical in all other respects you may do better to try and swap your original stator into the new housing ( not sure where it has broken).


Unless you can use your original winding in 1 star then I don't think you will get much results from the 575v machine without a lot of messing about.


Flux

« Last Edit: October 25, 2009, 01:22:18 AM by Flux »

TroubledGus

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Re: Conversion Question
« Reply #3 on: October 26, 2009, 10:41:24 AM »
A small Baldor like that is probably wound with concentric coils using a consiquent pole method ( not many choices to modify it ). Cheaper to produce, and I agree it sound like a Canadian motor....
« Last Edit: October 26, 2009, 10:41:24 AM by TroubledGus »