The output voltage of a permanent magnet alternator depends on the shaft rpm and the load. The higher the rpm, the higher is the voltage. The higher the load for a given rpm, the lower is the voltage.
Current & RPM when connected to load
The current (“amperage”) of a dc generator at any rpm is not governed by its rpm but only by the load put on it. This means that if you run a generator with no load, the current stays at zero no matter how high the rpm is. Only the Generator terminal voltage goes up, but no matter how high the voltage is, if there is no load, there is no current flow.
Frequency
Frequency is related to the rpm and the number of poles the generator has. The more the number of poles, the higher is the frequency at a given rpm.
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