How can i link the powersys domain with my BLDC motor model?

Question

Om Sharma 2017-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/326997-how-can-i-link-the-powersys-domain-with-my-bldc-motor-model

编辑： Brandon Eidson 2017-3-10

Hello I have been working on creating a motor model for BLDC (trapezoidal) motor using d-q frame. It is running fine in motoring mode as i use voltage measurement port to connect to the inverter . But i observed that the current drawn from DC source was 18mA but the motor phase currents were around 4A. I doubt this is because i have not linked powersys domain block to my motor model. Therefore i'm not able to run the motor in regenerative mode while the BLDC motor model from MATLAB works fine. If anyone has clue about this problem it will be very useful. I'm attaching few images

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Answer 1

Brandon Eidson 2017-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/326997-how-can-i-link-the-powersys-domain-with-my-bldc-motor-model#answer_258036

编辑：Brandon Eidson 2017-3-10

BLDC_simplified_corrected.zip

Hey Om, the issue you are facing is a common one. I have inspected the model you sent over. The root of the issue if that you are only feeding source (voltage) information from the physical domain to the Simulink model. You are not feeding back any load (current) information from the Simulink Model to the physical domain.

The "power_VariableInductor" model shipped with MATLAB illustrates how to properly interface between Simulink and the physical domain. Please execute that command in your MATLAB Command Window to open the example. Then look under the mask of the "Variable Inductance" subsystem to see how the inductor model is implemented in Simulink and connected to the physical domain.

I have added the proper implementation to the model you sent, and it appears to work as expected. You can find it attached.