| carcrazy | -- 12-03-2009 @ 9:25 AM |
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What needs to be done to retain the original direction of rotation of a starter motor when going from a positive ground electrical system to a negative ground system?
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| supereal | -- 12-03-2009 @ 11:32 AM |
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Nothing.
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| 51f1 | -- 12-03-2009 @ 2:16 PM |
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In case anyone is curious, the starter has electromagnet field coils, so the polarity of the field coils and the rotor both change if you change the battery polarity. With the polarity of both changed, their relative difference polarity-wise remains the same, and the rotor continues to turn in the same direction. If the field coils were permanent magnets, the polarity of the rotor would change, but the field coil polarity would remain the same resulting in the rotor rotating in the opposite direction. However, the 6-volt rotor operating on 12 volts will turn faster which is an advantage. I have read that when Ford went to 12 volts, they continued to use the same 6-volt starter. I don't know if that's true, although it could be. When you double the voltage, you halve the amperage for the same power. That's why the 12-volt battery cables are smaller and why the 6-volt starter will operate on 12-volts without any damage. Amperage is what causes heat in an electrical circuit or device. Less amperage, less damaging heat. Richard This message was edited by 51f1 on 12-3-09 @ 2:16 PM
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