Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    la vache fantôme phantomcow2's Avatar
    Join Date
    Aug 2004
    Location
    NH
    Posts
    6,266
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Just how hot can a DC motor get?

    Just out of curiousity, how hot can a DC motor get?
    It is a brushed motor, 4/5HP. Should it be so hot that I cant touch it?
    C://dos
    C://dos.run
    run.dos.run

  2. #2
    2-Cyl, 1/2 HP @ 90 RPM slvoid's Avatar
    Join Date
    Oct 2003
    Location
    NYC
    My Bikes
    04' Specialized Hardrock Sport, 03' Giant OCR2 (SOLD!), 04' Litespeed Firenze, 04' Giant OCR Touring, 07' Specialized Langster Comp
    Posts
    15,762
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  3. #3
    la vache fantôme phantomcow2's Avatar
    Join Date
    Aug 2004
    Location
    NH
    Posts
    6,266
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    heh, actually I had a situation which was almost like that!
    The two cables for the motor are insulated, but were for some reason touching the motors metal shell. The motor was under high load for a while, and was getting so hot that it melted the wire insulation! Needless to say...
    Blue sparks ensued
    C://dos
    C://dos.run
    run.dos.run

  4. #4
    Unique Vintage Steel cuda2k's Avatar
    Join Date
    May 2005
    Location
    Allen, TX
    My Bikes
    Kirk Frameworks JKS-C, Serotta Nova, Gazelle AB-Frame, Fuji Team Issue, Schwinn Crosscut, All-City Space Horse
    Posts
    11,486
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by phantomcow2
    heh, actually I had a situation which was almost like that!
    The two cables for the motor are insulated, but were for some reason touching the motors metal shell. The motor was under high load for a while, and was getting so hot that it melted the wire insulation! Needless to say...
    Blue sparks ensued
    Hot enough that they'll remove your finger prints if you touch them.

    Little side story - car starter motors are DC motors meant to be run for short periods of time and have a fairly heavy oil in them. In school I was part of a group who was tasked with building a small 1 person electric car of sorts. Granted, this was very early in school, enough so that parents did a large part of the help/work. One of the kids parents thought it would be a great idea to use a starter motor to power our car. What ensued was that heavy grease/oil getting so hot that it was about the consistancy of WD40. I could smell the heat from 10 feet away, I was only like 12 and I was saying 'I told you so' to these parents left and right. Should have known then I was the only bright bulb on that sinking ship.

  5. #5
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,495
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had an RC car that I burned out the motor by using a 9.6v battery instead of 7.2v. Melted the windings into a solid lump of copper...

Posting Permissions

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