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The "torque constant" parameter of PMSM block (Simscape / Electrical / Electromechanical / Permanent Magnet)

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Dear Sir/Madam,
I am a customer of MATLAB. I am currently working with PMSM block (Simscape / Electrical / Electromechanical / Permanent Magnet).
I have some problems with parameter "Torque constant", and my questions are:
  1. What is the definition of the "Torque constant" parameter?
  2. What is the method for identification of this parameter?
If I have a motor specification, how can I fill this parameter to model? For example, the sample pre-defined model (Allied-Motion, part: HMP04_002), has: (in 2021A, Update 7).
  • Torque constant in model: 0.0483412016764879
  • Torque constant in specifications: 0.1
I find the mis-match point between model parameter and specification about Torque constant. Can you explain for me?
3. The unit of torque constant: Nm/Apeak or Nm/Arms?
I would like to hear your opinion. Thank you very much.
Best regards,

Risposte (1)

Sanjana
Sanjana il 25 Ago 2023
Hi Hoa,
I understand that you are facing an issue with pre-defined parameterization of the “PMSM” block in Simscape.
“Torque Constant” parameter of the “PMSM” block, is the peak torque induced by the per-unit current of each of the phase.
The reason for the mis-match between the “Allied-Motion HMP04_002” pre-defined parameterization of the “Standard PMSM” block and the specifications shared by you for the “Allied-Motion HMP04_002 PMSM servo motor”, is because PMSM Servo Motors are optimized for high-performance motion control applications requiring precise position, speed, and torque control, while Standard PMSM Motors are designed for general-purpose applications with a focus on high torque, efficiency, and speed control.
The pre-defined parameterization can be edited by double-clicking the “PMSM block” and editing the “Torque Constant” Parameter under the “main” section in “Block-Parameters”.
Below is the screenshot, for editing the “Torque Constant” parameter,
As per the official documentation, the unit for the “Torque Constant” is “N*m/Apeak”.
Please refer to the following link, for further information,
Hope this helps!
Regards,
Sanjana

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