Input of Motor Parameters from Data Sheet in STM32 Motor Control Workbench

[hashiR]

Hello ST Community,

I am currently working with a motor that isn’t compatible with the motor profiler, so I need to manually input the motor parameters provided in the data sheet.

The data sheet specifies the following values:

• Rs (phase-to-phase) = 16.1 ohms
• Back EMF constant = 0.121 V/Krpm
• Ls (phase-to-phase) = 0.140 mH

To correctly enter these values in the configuration, should I input them as:

• Rs = 16.1 ohm
• Ls = 0.140 mH
• Back EMF constant = 0.121 Vrms/Krpm ?

Or is there a different approach or format I should follow when inputting these parameters?

Thank you in advance for any guidance!

 

[Gael A]

Hello hashiR,

If you want to input your motor parameters manually, you can create a motor .json file based on an already existing one to avoid having to set your data every time you want to create a project using that motor.

You can have a look at our guide on the MC Wiki for info on every needed parameter.

Also, be aware that the values of R and L given in your motor's datasheet are phase to phase, which does not correspond to Rs and Ls : they should be two times lower than what you have.

[hashiR]

Thank you for the information.

Could you confirm if the Back EMF constant of 0.121 V/kRPM in the documentation is given as V_peak/kRPM and should be converted to Vrms/kRPM (0.121 ÷ √2 = 0.0856 Vrms/kRPM) for use in the workbench?

Additionally, are the following values correct?

• Rs = 8.05 Ω (phase-to-phase ÷ 2)
• Ls = 0.07 mH (phase-to-phase ÷ 2)
• Back EMF constant = 0.0856 Vrms/kRPM

Thank you for confirming.