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Alternator Question #2733448
01/15/20 07:19 PM
01/15/20 07:19 PM
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Lee Co. Fla.
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5carguy Offline OP
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5carguy  Offline OP
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Can I use a square back(73) armature in a round back(69) alternator?
TIA

Re: Alternator Question [Re: 5carguy] #2733540
01/16/20 05:03 AM
01/16/20 05:03 AM
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Valencia, España
NachoRT74 Offline
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Yes.

I think you meant the rotor... right?

Last edited by NachoRT74; 01/16/20 05:04 AM.

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Alternator Question [Re: NachoRT74] #2733603
01/16/20 01:28 PM
01/16/20 01:28 PM
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Colorado front range
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BcudaChris Offline
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I'll posit that Armature/Field = Rotor/Stator with regard to alternators. My observation is that the former nomenclature is aviation/old school as opposed to auto/motorcycle.

Re: Alternator Question [Re: BcudaChris] #2733698
01/16/20 06:08 PM
01/16/20 06:08 PM
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NachoRT74 Offline
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I's say the difference is on which one moves by itselfs with energy ( i.e. Starter motor ) and which one moves by an external source ( i.e. alternator ).

on a starter motor the "rotor" is actually the armature. and the outside area are the fields which by the way get energized... stator doesn't

Last edited by NachoRT74; 01/16/20 06:09 PM.

With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: Alternator Question [Re: NachoRT74] #2733707
01/16/20 06:45 PM
01/16/20 06:45 PM
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Phila. Pa.
Mattax Offline
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I think the change in nomenclature reflects generator vs alternator.
Generator's output power is created in the spinning armature, and the magentic field is fixed.

Alternators' output power is created in the static windings.
So in the alternator, the magnetic field created in the spinning rotor induces an electrical potential in the stator.

See the intro to the new Alternator
http://www.imperialclub.com/Repair/Lit/Master/148/page05.htm
as well as 1953 explanation of generator
http://www.imperialclub.com/Repair/Lit/Master/069/Page14.htm

GM has never used the term alternator. laugh2 Its the Delcotron AC Generator.
But inside is still a stator and rotor (in US and Canada, Maybe UK is different)
https://delcoremyhistory.com/Service%20Manuals/introdelcotron-1962.htm

https://delcoremyhistory.com/Service%20Manuals/12voltpassengercar-1952.htm

Re: Alternator Question [Re: 5carguy] #2733712
01/16/20 06:54 PM
01/16/20 06:54 PM
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Mattax Offline
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Originally Posted by 5carguy
Can I use a square back(73) armature in a round back(69) alternator?
TIA


Back your question.
The first generation squareback rotors might physically fit in a round back.
I have some doubts because my impression has been the squareback not only has better cooling, but is slightly larger.
If its not larger, then the improvements in potential output would only relate to either closer tolerances or windings that produce more heat.

I think have some photos of both. I'll look.

Re: Alternator Question [Re: Mattax] #2733716
01/16/20 07:15 PM
01/16/20 07:15 PM
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Mattax Offline
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The sure look similar. The shaft diameters are definately the same.
I can't say how the number of claws and winding details are best matched with a stator, but there is science to it.

I can warn you not to use aftermarket pulleys without very carefully checking all dimensions.
At least some (many?) of the yellow chromate ones have too tight of an inner diameter and also do not always line up correctly with the other engine pulleys. mad
The OD is also too fat for most pullers. mad

Also try to find/save the shaft grease shield on the diode side. I notice a lot of the rebuilds leave them out. Then the slip rings get contaminated more quickly than they should. There doesn't sem to be a retail source for new ones. Originally they came in a repair package with the slip rings.

Re: Alternator Question [Re: Mattax] #2733800
01/17/20 04:38 AM
01/17/20 04:38 AM
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NachoRT74 Offline
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I already have interchanged rotors from roundbacks to squarebacks in the past with success, even with 80s alternators.


With a Charger born in Chrysler assembly plant in Valencia, Venezuela






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