6 wire alternator conversion

Electric Motors and Controllers
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baldytron
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6 wire alternator conversion

Post by baldytron » Mar 11, 2018 9:22 am

I have two nice alternators I would like to use as BLDC motors for some mini go karts.
But these have six wires and I cant figure out if or how to use them :?

Wires 1,2 and 3 have continuity with each other (green)
wires 4,5 and 6 have continuity with each other (blue)

Any ideas ?
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flippy
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Re: 6 wire alternator conversion

Post by flippy » Mar 12, 2018 10:11 am

Most alternators are 6 phase. 2x3 phases. So 2 separate motors basically.

baldytron
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Re: 6 wire alternator conversion

Post by baldytron » Mar 13, 2018 3:00 pm

flippy wrote:
Mar 12, 2018 10:11 am
Most alternators are 6 phase. 2x3 phases. So 2 separate motors basically.
Thank you

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flippy
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Re: 6 wire alternator conversion

Post by flippy » Mar 14, 2018 8:20 am

no problem. but how are you planning on using a BLDC drive controller when a standard alternator uses brushes?

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fechter
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Re: 6 wire alternator conversion

Post by fechter » Mar 14, 2018 9:48 am

You would need to power the field winding or replace it with permanent magnets to use it as a motor.

Simplest is to power the field windings. Most take around 2A @12v. 24W of wasted power.

For testing, you could use a 12v power supply to power the field, then spin the shaft and measure the voltage between your wires to determine the phasing.
"One test is worth a thousand opinions"

John in CR
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Re: 6 wire alternator conversion

Post by John in CR » Mar 15, 2018 3:37 pm

It doesn't have 6 phases. It's just that the end of the windings hasn't been terminated as Delta or WYE. Do your termination in whichever configuration you desire, leaving you with 3 phase wires.

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parabellum
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Re: 6 wire alternator conversion

Post by parabellum » Mar 15, 2018 4:52 pm

John in CR wrote:
Mar 15, 2018 3:37 pm
It doesn't have 6 phases. It's just that the end of the windings hasn't been terminated as Delta or WYE. Do your termination in whichever configuration you desire, leaving you with 3 phase wires.
There would be continuity in pairs if the windings are not terminated. He has continuity between 3 wires.

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Re: 6 wire alternator conversion

Post by John in CR » Mar 15, 2018 5:27 pm

Good point. It's been so long since I fooled with cars, I didn't know 6 phase alternators even existed. It sounds like a good candidate for a pair of sensorless controllers.

baldytron
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Re: 6 wire alternator conversion

Post by baldytron » Mar 16, 2018 5:13 pm

Cheers guys :D
I was planning on using a sensorless bldc controller and a brushed controller for the field coil.
I have added some more pics and I sacrificed one for fun
This is how the wires are joined
20180316_150344_1521237669735_resized.jpg
once they are cut I am left with 3 groups of 4 wires these have continuity in pairs
20180316_150656_1521237671527_resized.jpg
With the pairs marked in color
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parabellum
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Re: 6 wire alternator conversion

Post by parabellum » Mar 17, 2018 1:33 am

They where terminated in star, which is pretty nice. No parasitic recirculating current and you can use higher voltage. I can be wrong, but it looks like the winding sets are shifted, you will need to use 2 controllers in different timing, hopefully they will not interfere/trigger each other.
Can you show the bridge rectifier used on this Gen?

baldytron
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Re: 6 wire alternator conversion

Post by baldytron » Mar 22, 2018 9:55 am

parabellum wrote:
Mar 17, 2018 1:33 am
Can you show the bridge rectifier used on this Gen?
No sorry destroyed them, it was the first part I binned.

I only have one controler at the moment so I can not test.
But this video gives me hope

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