Why Does Generator Rotor Speed Decrease with Higher Ratings?

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SUMMARY

The discussion centers on the relationship between generator ratings and rotor speed, specifically in generators designed by company X. As the rating of the generator increases, the rotor speed decreases due to the need for thicker copper and more magnetic material, resulting in a larger rotor diameter. This larger circumference necessitates the use of more poles with an optimum aspect ratio, allowing for lower speeds to generate the same frequency of AC power.

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DUET
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Today I observe some generators of different rating which have designed by a company called X. I notice that the speed of the rotor reduce as the rating of the generator increased.

Could someone please explain it to me why?
 
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You have not specified DC generator or AC alternator.

More power requires thicker copper and more magnetic material. That makes it a bigger diameter rotor. More circumference uses more poles of optimum aspect ratio, so less speed is needed to generate the same frequency AC power.
 

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