Efficiency derived from motor voltage & duty

I've a motor, which powers a generator, which feeds into a converter, which gives out voltage/amps, which is measured.

The voltage into the motor is DC and fixed at 25V. The resistance could be measured but I haven't done so.

If the duty is 100% and no load is applied the motor will spin fast. If a load is applied the motor will spin slower, but would the current change?

If I were to measure the current at 100% duty beforehand, and if current is linear with duty cycle, I could calculate the wattage for a given duty cycle and use this to compute system efficiency.

Would it work?

As load increases then current input (and output) increases - however, the entire scheme sounds massively inefficient in the first place, why add a a motor and generator in the first place?.

Motor-generators are commonly used where it is necessary to change power frequency. DC to 50Hz or 60Hz. 60Hz to 400Hz.

Visitor said:

Motor-generators are commonly used where it is necessary to change power frequency. DC to 50Hz or 60Hz. 60Hz to 400Hz.

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Perhaps you missed the converter at the end of them both?. I'd also suggest 'were used' rather than 'are used', as it's antique obsolete technology - and the system was pretty inefficient anyway.

No Nigel, I know you are older than dirt, but your experience doesn't prove or disprove anything. Just because you haven't seen something does not prove its doesn't exist.

Weird that a company could build its business around
"antique obsolete technology".

Perhaps they know of applications beyond your knowledge.