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Generator Design question

  1. Oct 21, 2013 #1
    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?
  2. jcsd
  3. Oct 21, 2013 #2


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    Science Advisor

    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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