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Re: CIM generator
The field is easy to understand. Instead of using permanant magnets like the motors, the alternator from a car uses an electromagnet. This allows the voltage output to be adjustable: strong field= higher voltage
with an alternator, when you first start it up, if there is no field at all then it cannot produce any output (its like the magnets are missing), so you power the field from a battery. Once the alternator has an output voltage you can tap off part of its output to drive the field winding and you dont need a battery anymore.
Im not sure about the voltage output levels from an alternator. Can you get 18V from it? usually the voltage regulator is built into the alternator itself, and its designed to charge a car battery, and to power your car
also they are usually potted in epoxy, so I dont think you could open one up and change a resistor to increase the output.
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