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fmaletic
fmaletic
Visitor II
September 24, 2014
Question

Torque limitation in PMSM FOC

  • September 24, 2014
  • 1 reply
  • 585 views
Posted on September 24, 2014 at 10:26

Hi,

I'm controlling my PMSM at zero speed. While I'm trying to move its shaft I don't want my motor to generate its maximum torque to resist my movement but the limited one.

Everything went fine with classic control, but as soon as I tried to limit it's torque -- by limiting outputs of speed and Q-current PI controllers on some smaller values -- the motor started spinning (?!). 

I really have no idea how to accomplish described task, exept by limiting outputs of PI controlers 

Any suggestions?

Thanks in advance!

 
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1 reply

Gigi
Gigi
ST Employee
September 29, 2014
Posted on September 29, 2014 at 09:01

Ciao user.user

I don't think that limiting the Q-current PI is correct because in that whay you are just limiting the volatge applied in the Q axis (Maybe this is the reason why the motor start to spin).

Try just to limit the output of the speed PI using the MC API (this usually works).

Ciao

Gigi

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