AC commutator motor

Discussion in 'General Electronics Chat' started by strantor, Oct 10, 2011.

  1. strantor

    Thread Starter AAC Fanatic!

    Oct 3, 2010
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    I took apart a failed angle grinder the other day. I saw brushes, so I figured "oh, it must be DC, so I will check the rectifier" - there was no rectifier. I have learned of a new type of motor! I checked here and I see it's a "AC commutator motor" (Single phase series motor )- but I don't understand from reading that, how does it work? it seems to me like that motor is exactly the same as a DC motor, yet works on AC? If you were to put AC through a DC motor (which is how I perceive this motor to operate) I would think it would oscillate at 60HZ or just burn up.
     
  2. strantor

    Thread Starter AAC Fanatic!

    Oct 3, 2010
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    Oh, I think it get it; since the current flowing through the armature is the same current flowing through the field, no matter where the current is (along the AC waveform, peak pos, peak neg, etc) the magnetic field of the armature is offset from the magnetic field of the field by the same degree (set by the commutation).
    Is that right?
    If so, does that mean I can run any ol DC series motor on AC?
     
  3. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    strantor likes this.
  4. strantor

    Thread Starter AAC Fanatic!

    Oct 3, 2010
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    Ah, so the only difference is the core:
    Thanks shortbus
     
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