×
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

Fyring angle of an inverter

Fyring angle of an inverter

Fyring angle of an inverter

(OP)
Hi guys,

I work now with an inverter feeding a synchronous machine (load-commutated). The characteristic of the firing angle as a function of stator current is usually constant up to certain level and then it starts to fall.
In this case the firing angle is rising at the beginning with the current and later with high current then falling again.
I heard that the reason might be to eliminate harmonics. I just wonder.. My imagination was that the ideal firing angle is 180 degrees. Of course, you cannot drive this angle because of the commutation notch and the time to renew to blocking capability of the thyristor. Usually we don't drive with firing angle over 160 degrees. On the other hand I would expect that the lower firing angle on the inverter side, the worse power factor (cos phi) and the lower torque.
Do you have any explanation?
Martin

RE: Fyring angle of an inverter

(OP)
Firing angle, sorry for that misspelling :)

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