LAUNCHXL-F28069M: Simulink closed loop control system

GuCheol Jeong

Part Number: LAUNCHXL-F28069M

Hi all,

I'm using the Ti LAUNCHXL-28069M to run the PMSM motor using the SPI absolute encoder.

I used the "mcb_pmsm_foc_qep_f28069LaunchPad" example and modified it to do the position control of the motor as shown below.

The serial communication interface(SCI - A) and interrupt are used for the communication and the interrupt is used for Serial RX and TX.(priority is 40 and 60).

The issue is that if I add one feedback loop for position control or speed control, it's working but if I used both feedback loops, Serial Receive values(PosRef_PU) does not enter (it keeps showing 0) and motor does not work.

This is the position control block

This is a velocity control block.

I don't know why the controller does not work if I use the two closed-loop control.

Could anyone please help me with this issue?

Best regards,

over 3 years ago

0 Santosh Jha over 3 years ago

TI__Guru 50611 points

Hi,

Please take a look at MathWorks FAQ at this link below:

If you have further questions, the best way to get support on MathWorks products is to contact MathWorks live tech support.

You can also search for answers or post a question on MATLAB Answers C2000 forum. Additionally, there is info on MathWorks support C2000 in Documentation and Examples.

I will close the thread from here as the software is supported by MathWorks team on their forum.

Thanks & Regards,

Santosh

0 GuCheol Jeong over 3 years ago in reply to Santosh Jha

Prodigy 60 points

Thank you for your response.

I already asked about this issue on MathWorks FAQ 10 days ago but haven't gotten any response.

0 Santosh Jha over 3 years ago in reply to GuCheol Jeong

TI__Guru 50611 points

We do not have resource to support Mathworks questions and we rely on them. As they have pool of engineers working on MathWorks forum, it is better supported there.

If they have not responded, can you just follow up there? Also, please send me the link, so that I can also follow up with my contacts.

Regards, Santosh

0 GuCheol Jeong over 3 years ago in reply to Santosh Jha

Prodigy 60 points

Thank you, Santosh!

This is the link for my Mathworks question.

https://www.mathworks.com/matlabcentral/answers/1871802-how-to-use-the-two-feedback-loop-in-c2000-embedded-coder-in-simulink

0 Santosh Jha over 3 years ago in reply to GuCheol Jeong

TI__Guru 50611 points

I have contacted MathWork engineers through email and requested them to support on either of the link. They are based at Bangalore, so we should expect response by tomorrow.

Regards, Santosh

0 GuCheol Jeong over 3 years ago in reply to Santosh Jha

Prodigy 60 points

Awesome! Thank you so much for your help!

0 Santosh Jha over 3 years ago in reply to GuCheol Jeong

TI__Guru 50611 points

Unfortunately, we did not hear back from MathWorks team yet. I will send another reminder today.

Regards, Santosh

+1 Ram Swaroop Alla over 3 years ago

Intellectual 730 points

Hi GuCheol,

We have a separate shipping example for both position and speed control. You may refer to this example below:

https://in.mathworks.com/help/mcb/gs/position-control-pmsm-motor.html

However, note that the position control uses P controller but not the PID controller as in your case. Ideally, this should work for PID controller as well.

Also, you may need to change the target board to F28069M Launchpad in the hardware settings.

If you have any further queries, you may contact MathWorks Technical support. When we have a support ticket, our internal process enables us to involve right people on this issue and we will immediately get in touch with you to understand the case in more detailed way.

Please connect to us at:

https://www.mathworks.com/support.html

Best Regards,

Ram Alla | MathWorks

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LAUNCHXL-F28069M: Simulink closed loop control system