I hope this isn't considered a double post but I'm getting no attention in the automotive group. I'm trying to convert an automotive alternator (slip ring synchronous 3 phase) from 12 volts to 24. I was able to install a 24 volt stator but cannot source a 24v rotor. For industrial applications (100-150kW gen sets) I usually don't have to change the rotor when wiring between high and low voltages so I'm not totally sure what is different in this case. From literature I see that 12 volt alternators have ~4 amps rotor current and 4 ohms resistance. For 24 volt alternators there is ~2.5 amps rotor current and 10 ohms resistance. Would it be reasonable to place a ~6 ohm resistor in series with the field? Should I just run it as is?
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