Thread: DC motor question / making my own ceiling fan
Close
Login to Your Account
Likes Likes:  0
Results 1 to 4 of 4
  1. #1
    Join Date
    Nov 2008
    Location
    Brookshire,Texas USA
    Posts
    431
    Post Thanks / Like
    Likes (Given)
    48
    Likes (Received)
    141

    Default Thread: DC motor question / making my own ceiling fan

    First I don't know why my question / thread was closed. Is this not posted in the general section.

    DC motor question / making my own ceiling fan

    Second thanks to the following

    JST

    L Vanice

    Bill D

    wheels17

    thermite (The famous / notorious "long bar" at Raffles, Singapore is a replica (then again, so is most of Singapore!)

    henrya

    Strostkovy ( how to control / slow this to a very slow maximum speed of 25 to 35 rpm )I could bolt this
    directly to the side of my 5" x 16" ridge beam, & make a adaptor coupling

    9100 ( Variac (AKA Powerstat) that I would send you for shipping, Offer still good ?

    ratbldr427 (fixed blades, non composite)

    Tony Quiring



    Thanks to all who contributed information for my project, it is on the back burner but i am still
    gathering information for this.

    I would prefer a DC brushless motor without belts to keep the whole drive contraption as compact
    as possible.

    I am having difficulty finding something like a typical pancake style motor for a typical ceiling fan
    have run into some Chinese made motors that look like something i could use, [B]BUT[B] that is not an
    option for me, going to have to be a USA product


    I am going to be building a 8 foot ceiling fan out of an old Aermotor Windmill.


    1) so I am looking for low RPM, (max 25 or so ) direct drive DC brushless with some torque & speed control
    to it to get this thing up to rolling speed.

    Thanks in advance
    Mark

  2. #2
    Join Date
    Aug 2004
    Country
    UNITED STATES
    State/Province
    Virginia
    Posts
    2,835
    Post Thanks / Like
    Likes (Given)
    230
    Likes (Received)
    1297

    Default

    Treadmill motor and controls. You can find them at the junk yard all the time if they allow dumpster diving.

  3. #3
    Join Date
    Feb 2011
    Location
    BFE Nevada/San Marcos Tx
    Posts
    2,900
    Post Thanks / Like
    Likes (Given)
    2973
    Likes (Received)
    1840

    Default

    Quote Originally Posted by crossthread View Post
    Treadmill motor and controls. You can find them at the junk yard all the time if they allow dumpster diving.
    Pretty sure most treadmill motors are brush type, only possibility I can think of is an out rotor dc motor, but I'd have to check to verify if they are brushed/brushless.

    OP, cannot say I've seen many pancake style dc motors that are not made in china, and even then they are not common. Have you considered the weight of an 8ft windmill prop? The Big Ass fans use a gearbox to run as slow as they do, and lots more support from the bearings involved. Why dc, why direct drive?

  4. #4
    Join Date
    Apr 2016
    Country
    UNITED STATES
    State/Province
    Texas
    Posts
    451
    Post Thanks / Like
    Likes (Given)
    182
    Likes (Received)
    187

    Default

    Quote Originally Posted by crossthread View Post
    Treadmill motor and controls. You can find them at the junk yard all the time if they allow dumpster diving.
    I don't think I'd want to be in the same room as an 8ft fan being spun at 1000-4000rpm

    To the OP - how much torque will you need to get that rotor up to speed (low 10s rpm?). Figure that out and use that to find a gear reduction DC motor that will provide that torque figure (or more). How much room do you have in the ceiling? You may be better off with a gear reduction box and a 2 or 3 speed AC motor hidden away in the ceiling. This isn't a trivial engineering problem, that's for sure.


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •