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msingh
msingh
Senior
June 12, 2020
Solved

PID tuning to achieve smoothness at very low speeds

  • June 12, 2020
  • 4 replies
  • 6236 views

Hi,

I am using the NUCLEO-F303RE and NUCLEO-IHM08M1 to drive a maxon 48V DC motor with incremental encoder (1024 counts). I have used the motor profiler and motor control workbench, the PID values automatically generated were completely wrong and the motor would loose smoothness at speeds below 700RPM or 500 RPM. After spending months I have identified the issues and adjusted the PIDs so I can now drive the motor as slow as 45 RMP and keep a good smoothness. However the requirements of the project need the motor to run as slow as 1RPM. The drive settings I am using are below. Is there anyone that has experience with BRUSHLESS MOTORS AND/OR the NUCLEO-IHM08M1?

Thanks in advance 0693W000001qcpeQAA.jpg

This topic has been closed for replies.
Best answer by msingh

@Community member​ , I have noticed their forum has changed layout so I'm guessing they are asking everyone if they still need help and move the question to the new layout or maybe they just trying to show "they read the questions however don't know the answer to (loool that was just a joke) ". Anyways if you are interested in getting the answer to this question I have figured it out, check the following.

https://community.st.com/s/question/0D53W00000DgoV9SAJ/is-anyone-able-to-drive-a-bldc-motor-at-low-speeds-anything-below-6-rpm

4 replies

Laurent Ca...
Laurent Ca...
Senior III
September 14, 2020

Dear msingh

Do you have still this problem to solve?

Best regards

Laurent Ca...

msingh
msinghAuthor
Senior
September 14, 2020

Dear Laurent,

I am still working on this project, I have achieved speeds as low as 6 RPM however I am not able to rotate any slower. I have tried using the MCBW monitor and set different speeds however any speeds requested below 6 rpm results in a blocked rotor. Recently I have been advised (from a ST community member) to try the position control instead of speed control, I have created a project however I haven't had enough time to tune the PIDs yet but I'd appreciate your feedback on this, can I achieve 1RPM as slowest speed with position control? as well as maximum speed of 6000 RPM? Is there any better option?

The requirements of the project are the followings:

1) FOC control

2) minimum speed: 1rpm

3) maximum speed: 6000 rpm.

I'd appreciate any help

Kind Regards

Manpreet Singh

msingh
msinghAuthorAnswer
Senior
September 23, 2020

@Community member​ , I have noticed their forum has changed layout so I'm guessing they are asking everyone if they still need help and move the question to the new layout or maybe they just trying to show "they read the questions however don't know the answer to (loool that was just a joke) ". Anyways if you are interested in getting the answer to this question I have figured it out, check the following.

https://community.st.com/s/question/0D53W00000DgoV9SAJ/is-anyone-able-to-drive-a-bldc-motor-at-low-speeds-anything-below-6-rpm

Laurent Ca...
Laurent Ca...
Senior III
September 23, 2020

Dear @msingh​ 

Does the answer in th post highlighted by @Community member​ answer to your question?

Whatever, thanks @Community member​​.

Best regards

Laurent Ca...

Laurent Ca...
Laurent Ca...
Senior III
October 14, 2020

Dear @msingh​ 

I guess you don't have to solve this problem anymore, therefore I consider this post closed.

If not, feel free to reopen it by posting a new answer.

Best regards

Laurent Ca...

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