×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

how do i read out a dc motor

how do i read out a dc motor

how do i read out a dc motor

(OP)
I have a 10HP 480AC motor, with a multimeter, I'm reading 9ohms from leg to leg and then I compare it with one in stock brand new and similar which reads 5ooKohms from leg to leg. which one is correct and wich one is wrong.

RE: how do i read out a dc motor

9 Ohms. Koewreckter.

RE: how do i read out a dc motor

9 ohms is probably correct. Are both motors identical (ie no start windings, etc)?

RE: how do i read out a dc motor

Is the new motor connected for the correct voltage?  If it wasn't ever connected from the factory(unusual), that would be the only way to get 500kohms line to line.  Maybe there is an integral motor protection switch missing. These usually would be on the star or wye point of the 3 windings.

With an ohmeter on a motor that size what you are looking for is continuity, line to line, and none line to ground.  The ohms are usually so low it is hard to diferentiate between normal and abnormal with a common ohmeter.

Jim

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources