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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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dpack
Joined: 02 Jul 2005 Posts: 45516 Location: yes
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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Posted: Sat Feb 07, 15 1:30 am Post subject: |
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dpack wrote: |
iirc there is a difference in both the wiring and the speed of spin/torque between starter motors and alternators |
Yes, there would be. A starter motor is normally a DC motor driven by a battery, whereas an alternator generates AC. One is a coil spinning in a magnet, the other is a magnet spinning in a coil.
However, an AC motor (of the right type), I think, is equivalent to an alternator: if you connect AC across it, then it should spin.
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so although both are a set of copper wire coils and both fasten to a battery/engine (in rather different ways)they have very different build characteristics
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They do, but I think that is in the same way that an alternator is very different from a dynamo, and I know for certain that if you put power across a dynamo then it will spin. |
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dpack
Joined: 02 Jul 2005 Posts: 45516 Location: yes
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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RichardW
Joined: 24 Aug 2006 Posts: 8443 Location: Llyn Peninsular North Wales
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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vegplot
Joined: 19 Apr 2007 Posts: 21301 Location: Bethesda, Gwynedd
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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dpack
Joined: 02 Jul 2005 Posts: 45516 Location: yes
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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dpack
Joined: 02 Jul 2005 Posts: 45516 Location: yes
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vegplot
Joined: 19 Apr 2007 Posts: 21301 Location: Bethesda, Gwynedd
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crofter
Joined: 11 Feb 2007 Posts: 2252
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Posted: Sat Feb 07, 15 2:53 pm Post subject: |
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Hairyloon wrote: |
The Startomatic is a DC system, so it'll be a dynamo, not an alternator.
It has a box full of windings for regulatiion and control, but I can't imagine what would be needed on the dynamo itself. |
Lister also made Startomatics producing AC, we used to have one...
For example see here:
https://www.ebay.co.uk/itm/Vintage-1957-LISTER-START-O-MATIC-GENERATORS-Advertisement-STATIONARY-MOTOR-/200746724807?pt=AU_AdvertisingCollectables&hash=item2ebd6fedc7
Interesting page here:
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A DC generator can be made to give an output voltage that remains constant despite variations in load current, by means of a series field winding that boosts the field as the load increases, thereby compensating for the voltage drop. Such a machine is termed 'level-compounded', to distinguish it from one with a deliberate fall or rise in voltage with change in load. Although a constant voltage output would be desirable in a charging set for a floating battery, the compound generator is unsuitable for one important reason. When, as often happens during starting and stopping, the output voltage of the machine falls below that of the battery, its armature current reverses as the generator runs as a motor. If the armature current is heavy, the series field winding can reverse the residual magnetism in the iron frame of the machine, causing it to build up with reversed polarity at the next start.
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https://www.electrokinetica.org/d1/1/3.php |
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Hairyloon
Joined: 20 Nov 2008 Posts: 15425 Location: Today I are mostly being in Yorkshire.
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