Field-Weakening Control (with MTPA) of PMSM

Hello,

I would like to plot the MTPA curve in Matlab. For this I would need the code.

Has anyone of you already plotted this curve?

Many thanks in advance!

Greeting,

Michael

Answer 1

[Dakai Hu]

Hi Michael,

Are you referring to the MTPA trajectories based on fixed PMSM parameters ? If so, we now have a block in Motor Control Blockset named "MTPA Control Reference" that will generate the MTPA trajectories based on your motor's parameters. See the documentation for that block below:

https://www.mathworks.com/help/releases/R2022a/mcb/ref/mtpacontrolreference.html

If you are looking at plotting MTPA trajetories based on measured nonlinear torque/flux linkage tables, I could possibly help you come up with some MATLAB scripts once you are able to show me some data.

Answer 2

[Raghunath Rachabattuni]

Hi

You can refer to the following link to know the the principles behind the MTPA curve of a PMSM, and find how to plot them.

https://in.mathworks.com/help/mcb/gs/pmsm-constraint-curves-and-their-application.html

The link shows the equations for MTPA curves with linear lumped parameters for motor. It explains about all the characteristic curves of a PMSM too.

For non-linear parameters (for motors which saturate their core under heavy current operation), further down the page in the link, a block LUT based PMSM Control Reference (Generate lookup-table-based control reference currents for field-oriented control of permanent magnet synchronous motor - Simulink - MathWorks India) is shown, and it creates the MTPA curve based on the non-linear characterization data of the motor.

Hope this helps.