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Problem while using the motion terminal

Forum 1
(@gregoriorcm)
New Member

Dear Solo team,We have a problem when using the Motion terminal. Indeed, when we setthe values of speed controllers Kp, Ki and the speed reference (RPM),the real motor speed displayed in the monitor does not correspond to theone defined in the parameters. Furthermore, shortly after this incident,our no-load motor did not respond to any commands, it oscillated weakly.Namely, we had used an unbalanced part fixed to the motor axis, do youthink the problem could come from the use of this part or from thecontrol terminal?Thanks a lot for your helpController: Solo UnoMotor: https://hobbyking.com/en_us/turnigy-trackstar-sct-5t-sensored-brushless-motor-4150kv-550-size.html?___store=en_us Tutorial followed: https://www.solomotorcontrollers.com/blog/setup-tune-motors-using-solo-motion-terminal/

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Topic starter Posted : 10/05/2022 1:59 pm
SOLO Team
(@milad)
Chief Member Moderator

Hi @gregoriorcm,

- For the motor, you are using what value you are putting for the Number of Poles? ( I believe this motor has only 2 poles)

- If you are using the Motor in Sensorless mode, for this specific motor pls put the PWM frequency ( switching frequency ) at 70kHz

- Make sure for this specific motor you are using the "Ultra-fast brushless" type

BTW, can I have a screenshot from your motion terminal?

Regards
Milad

 

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

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Posted : 10/05/2022 3:10 pm
Forum 1
(@gregoriorcm)
New Member

Hello !

Thank you for your answer ! I'm giving you the screenshots of our motion terminal with our settings ! Just so you know, the value of Speed Controller Ki isn't defined when we press the "motor identification" button. We have to put it ourselves. However it worked before by pressing the button. 

Thanks for your upcoming help !

screenshot terminal 1
screenshot terminal 2

 

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Topic starter Posted : 12/05/2022 8:22 am
SOLO Team
(@milad)
Chief Member Moderator

Hi @gregoriorcm,

It seems that your Speed controller Gains are very small, can you try the same thing with the following gains:

Speed controller kp = 0.03

Speed controller Ki = 0.005;

Another point is once you are in sensorless, make sure you don't connect any sensors to the Encoder/Hall sensor input port, the pulse generated by the encoder or Hall sensor once in sensorless mode, especially for high-speed motors can disrupt the DSP and consume it's processing power for not a useful task.

I will remain available.

Milad

 

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

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Posted : 16/05/2022 7:47 am
Forum 1
(@gregoriorcm)
New Member

Thank you once again !

We're going to work again with higher value of Kp and Ki as you suggested ! And we think that we don't have any sensors connected to the Encoder/Hall sensor input port. The only things connected is the power supply and the cables between the motor and the controller !

Also, we wanted to know something about the speed controller Kp and Ki, what do they do exactly ?

Thank you for your upcoming help !

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Topic starter Posted : 16/05/2022 8:45 am
SOLO Team
(@milad)
Chief Member Moderator

@gregoriorcm

Posted by: @gregoriorcm

Also, we wanted to know something about the speed controller Kp and Ki, what do they do exactly ?

 

To learn more about these gains I recommend you to read the following article:

https://www.solomotorcontrollers.com/blog/setup-tune-motors-using-solo-motion-terminal/

after that, if you had other questions, I'll be more than happy to answer them.

Regards
Milad

 

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

ReplyQuote
Posted : 16/05/2022 8:51 am
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