×
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

Snubber Circuit

Snubber Circuit

Snubber Circuit

(OP)
Hello

I want to make a snubber circuit for protection of armature of DC motor. This is connected to a Simoreg drive of Siemens. The Peak Voltage is 565 Volts.

how do I calculate it?

THNX

RE: Snubber Circuit

Judging from the voltage your application seems to be in the high power range. So I'm afraid nbucska's link won't be very helpful.

Usually the the drives rectifier includes some kind of snubbers and other means of overvoltage protection to protect its own semiconductors. This is usually sufficient to protect other parts of the system as well. If you are asking for an additional snubber to protect the motor there must be a special reason. Please explain your concern more exactly and supply more information, e.g. current rating.

RE: Snubber Circuit

(OP)
Thenominal Voltage is 90-100Volts
The nominal current is at 15A approximately

RE: Snubber Circuit

You should not use that motor with that Simoreg drive without modification !

Use a step down transformer in fron of the Simoreg drive so that the DC output voltage matches the motor voltage. The drives manual should contain more information on that topic.

Otherwise you will have poor power factor and poor current ripple.

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