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Phil Martin
Starting Member
23 Posts |
 Posted - 21/09/2007 : 21:23:03
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Made this up the other night is it OK, I got the diagram from your green dream site.
This pic shows the rectifier is it 60 amp ? will this be OK for the Baldor i am building up ?
And I found 3 of these are they 25amp ?
Also has any one any idea what this is ?,I have 2 ,came out of a a UPS, I think !! I have seen similar units in wind power electric systems, but I sadly lack any Electronic Know how, I know they are use full but what for ? .
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ll81
Junior Member
124 Posts |
Posted - 21/09/2007 : 23:40:54
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3 phase alternator needs 3 rectifiers ( I assume that's what you have) otherwise you only get half wave rectification. That's bad because you only get half the power and pass a superimposed DC current through your alternator.
Thats a high power low impedance resistor.
Cheers, Liam
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fungus
Moderator
311 Posts |
Posted - 22/09/2007 : 00:37:40
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| They look correctly wired up and that configuration will give full wave; nice big heatsink too. The resistor is 0.75 ohm at 30w; maybe could use this as a braking resistor to slow it before shorting the wires? Just checked the part no. for the other rectifiers and yes; they are 25A. |
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Phil Martin
Starting Member
23 Posts |
Posted - 22/09/2007 : 01:39:21
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Thanks you two for your input, I have just done a search and found the data sheet for the "resistors" I cannot help myself from collecting these bits and bobs of electronics ,even though I have no idea what they are if they from a ac/dc unit of any description, I am sure that I or someone else might find a use !
Well II81 I think the Baldor motor is 3 Phase
but being a bit thick here ! that is why there are 3 blues going into the rectifiers ?
And thanks Fungus, do you think that the ones I have mounted are 60 Amp ?and what/how would you use them in breaking circuit.
Sorry you two for being a complete novice/ imbecile ,but I am trying hard not to be !
Phil |
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Gill
New Member
Australia
60 Posts |
Posted - 22/09/2007 : 02:53:19
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Wooaah!
This doesn't seem right. It says it is Brushless D.C. and it has 3 x blue wires going into it? If the 3 wires are indeed 3 phase then it must be rectified inside the motor to bring it to DC.
Now as a generator it must generate DC then back through the rectifier to 3 x blue wires as AC? I don't think so!!! You can't generate 3 phase AC from DC by using a rectifier. Besides, Why would you want to even if you could? You're only going to run those blue wires to a 3 phase rectifier changing it back to DC anyway. That's back to where you started.
Do away with all the rectifiers both inside and out is what I'm thinking.
I don't know the Baldor but it doesn't seem to be a simple DC motor to me.
Was there more wires into this motor originally? Possibly one of a different colour?
Without doubt, I would be getting more info before using the setup you have there.
Can you tell us more?
If not there are some meter reading you could take and some tests that may give a clearer picture.
Maybe I'm wrong. What do others think??
Cheers... Gill |
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Phil Martin
Starting Member
23 Posts |
Posted - 22/09/2007 : 03:16:30
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Hi Gill Posted A message for you on the other foum Here is a Pic of the wiring comming out of the motor ,sorry
The guys here said it was a odd ball motor!
I am very sorry for my replies ,just finished 7 nights/shifts and had a few glasses of wine etc.............. |
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Gill
New Member
Australia
60 Posts |
Posted - 22/09/2007 : 03:17:23
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Ahh.
Seems like I missed the first post where this was discussed.
Marked as DC yet with a AC input; That would be illegal in my country.
But there you go.
Cheers... Gill |
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BushWhacker
Junior Member
Canada
359 Posts |
Posted - 22/09/2007 : 07:56:00
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I'll keep watching this thread. When you are done sorting out Phil's motor, I have another nut to crack.
Cheers!
BW
Everything should be made as simple as possible, but not one bit simpler. - Albert Einstein |
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ll81
Junior Member
124 Posts |
Posted - 22/09/2007 : 11:09:11
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Its a DC motor that needs a controll box fed DC and switches it between the phases, it uses feedback from an internal sensor to the controll box. That's why it is brushless. The PM is the Rotor and the windings the stator.
Those Retifiers are indeed correct I was supping Bud before I read that post (was a bit blury).
Cheers, Liam
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ghurd
Average Member
USA
546 Posts |
Posted - 24/09/2007 : 22:18:57
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Nice find on that motor!
It is something on the order of a GE ECM. It will make a nice windmill when you figure out what it needs for blades.
The rectifiers look right. I would suggest soldering the terminal to the wire for this one.
The resistor is too low ohms and/or too low watts to be much good for anything.
G- |
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Phil Martin
Starting Member
23 Posts |
Posted - 25/09/2007 : 21:22:34
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Thanks All
I bought Ben's plans the other night for the PVC Blades, so when I get a Spare hour or so!!! at work going to cut cut down some pipe,
I might make them 5 foot, or whatever the length of pipe is(with some brasing steel strips), that,s been on the rack, gathering dust for years in the welding shop at work.
Still have issues with the cast Steel hub ?and tail boom to make up.
Thanks again for all your help and replies
Phil
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Re- Rectifiers etc.. Please look at these pics