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Thread: The Current War

  1. #11
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    Wonderful as the induction motor is I am trying to understand its historical importance in the context of the AC/DC Wars, given that a commutator motor works just fine on AC

  2. #12
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    Quote Originally Posted by ashiekh View Post
    Wonderful as the induction motor is I am trying to understand its historical importance in the context of the AC/DC Wars, given that a commutator motor works just fine on AC
    As it should... but at only about 50% efficiency.

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    ashiekh (2 Weeks Ago)

  4. #13
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    Quote Originally Posted by Jon Gerow View Post
    As it should... but at only about 50% efficiency.

    I knew my power drill and vacuum cleaner were only about 50% efficient, but didn't realize even the bigger ones were around there.

  5. #14
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    Quote Originally Posted by ashiekh View Post
    I knew my power drill and vacuum cleaner were only about 50% efficient, but didn't realize even the bigger ones were around there.
    Well.. Just think about how it works.

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    You are right

    https://en.wikipedia.org/wiki/Universal_motor
    "universal motors are usually relatively inefficient: around 30% for smaller motors and up to 7075% for larger ones"

    https://en.wikipedia.org/wiki/Induction_motor
    "Full-load motor efficiency is around 8597%"
    Last edited by ashiekh; 2 Weeks Ago at 12:06 PM.

  7. #16
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    30%! I gave it too much credit!

  8. #17
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    The 30% is probably for the little motors one gets in toys and the 50% in power tools is probably because they are pushing for a high power density.
    Last edited by ashiekh; 1 Week Ago at 08:18 PM.

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