Understanding Permanent Magnet Alternator
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.
Connection to Current and RPM o 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 in such case.
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.
