×
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

Open rotor versus locked rotor current for wound rotor motor

Open rotor versus locked rotor current for wound rotor motor

Open rotor versus locked rotor current for wound rotor motor

(OP)
Hello,
I have a wound rotor motor, 75 Hp.  On start up, the stator coils are energized with the rotor stationary.  Then a drum switch is used to allow rotor current and thereby start the motor.  The stator draws very little current while the rotor is open circuited.  But if I were to remove the rotor from the motor frame and then energize the circuit, I would destroy the windings.  What is the difference here?  Why doesn't the open rotor destroy the stator?

thanks
EE

RE: Open rotor versus locked rotor current for wound rotor motor

The difference in the two scenario's is the presence or absence of rotor iron.  When present it decreases the reluctance of the magnetic circuit and therefore increases the magnetizing reactance and limits the magnetizing current.

=====================================
Eng-tips forums: The best place on the web for engineering discussions.

RE: Open rotor versus locked rotor current for wound rotor motor

(OP)
That makes sense.  Thanks.

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