Connect with us

Very thin wire in an ac motor?

Discussion in 'Power Electronics' started by Arnak, Aug 15, 2021.

Scroll to continue with content
  1. Arnak

    Arnak

    26
    0
    Apr 1, 2011
    Hi,

    I recently had to repair a small (Hobby) single phase 240V AC motor.

    The fault was that one of the wires from the field coils (stator) to one of the brushes had broken.

    The repair worked fine but I wondered why such very very thin wire is used from the coils?

    When I say thin I mean not a lot thicker than a human hair, I assume that there is a reason for that?

    Can anyone explain that for me, please?

    Thank,

    Martin
     
    Last edited: Aug 15, 2021
  2. crutschow

    crutschow

    119
    27
    May 7, 2021
    Yes.
    For a small motor to operate from 240Vac, the field coil inductance must be very high to minimize the field current and keep the core from magnetically saturating, which requires a lot of turns.
    To get a lot of wire turns around a small coil requires the use of very thin wire.
     
    Harald Kapp and DBingaman like this.
  3. Arnak

    Arnak

    26
    0
    Apr 1, 2011
    Great, thanks for the answer!

    Martin
     
  4. Minder

    Minder

    3,105
    665
    Apr 24, 2015
    Also must be a Universal motor (AC/DC) if the fields are in series with the armature as it sounds.
    The rpm on these are controlled principally by the load
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-