Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Foo Off-Topic chit chat with no general subject.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-21-06, 10:38 PM   #1
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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
phantomcow2 is offline   Reply With Quote
Old 02-21-06, 10:46 PM   #2
slvoid
2-Cyl, 1/2 HP @ 90 RPM
 
slvoid's Avatar
 
Join Date: Oct 2003
Location: NYC
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)
Quoted: 0 Post(s)
slvoid is offline   Reply With Quote
Old 02-21-06, 10:50 PM   #3
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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
phantomcow2 is offline   Reply With Quote
Old 02-21-06, 11:04 PM   #4
cuda2k
Unique Vintage Steel
 
cuda2k's Avatar
 
Join Date: May 2005
Location: Allen, TX
Bikes: Kirk Frameworks JKS-C, Serotta Nova, Gazelle AB-Frame, Fuji Team Issue, Schwinn Crosscut, All-City Space Horse
Posts: 11,486
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(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.
cuda2k is offline   Reply With Quote
Old 02-23-06, 01:38 AM   #5
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(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...
DannoXYZ is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 02:18 PM.