Back EMF Constant within the Simscape PMSM block

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youjarr
youjarr 2021-1-13
评论： Pat Gipper 2021-1-22
Hello guys,
in the Simscape PMSM block I want to type in the Back EMF constant (kE).
But I cant find if I should give the data as a peak, rms or mean value neither if it should me a Line-to-Line or Phase value?
Because every Motor-Designer gives these data in different ways.
Thank you in advance.
Best regards.

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回答（3 个）

youjarr
youjarr 2021-1-21
Hello guys,
mathworks contacted me again and corrected their answer and provided me an example model.
The simscape PMSM block needs the BackEMF-Constant as peak and Phase value.
You will find the model attached.
Thank you all.
  1 个评论
Pat Gipper
Pat Gipper 2021-1-22
Thanks for posting this followup. The Mathworks example gives a nice implementation of a motor spin-test using Simscape. Specifying the flux linkage in Webers is always a bit of a question. Typically for a Wye connected motor I will have a measured phase to phase peak voltage which will be converted to either a torque constant in N*m/A or back EMF constant in V/(rad/s), which will have the same numerical value. But you can't just enter this value into the PMSM block parameters because this is asking for a "Phase value". So the value you enter needs to be divided by sqrt(3). It's a best practice to run this example to double check your selections.

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Tobias Schindler
Tobias Schindler 2021-1-13
kE is line-to-line in rms by standard definition. Note that does not mean that motor designers supply the value according to the standard definition nor that matlab follows this standard.
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Pat Gipper
Pat Gipper 2021-1-13
I have double-checked the Simscape PMSM interpretation of Ke and Kt in the past by doing the following; 1) Connect each phase through a large resistor to ground 2) Make the motor inertia value large 3) Give the inertia a speed initial condition. Then I just capture the phase to ground voltage across the resistors as a function of time. It duplicates the motor free-spin test.
youjarr
youjarr 2021-1-14
@tobias it seems so... . I think I am going to ask the support because this couldn´t be the solution... .
@Pat can you share what you find out if u already have tested it? Can you share your model and the results?

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youjarr
youjarr 2021-1-19
Hello,
I understand that we need a BackEMF constant peak and over one phase.
In a DELTA connection it doesn´t matter because phase and Line-to-Line is the same.
I tested the whole thing with a model and talked to a motor designer.
But what irritated me is the following text from Mathworks, which I asked for to do so just to make sure that it was there:
Quotation:
However, I checked the doc the doc for our internal database and I phase that the Back EMF constant means that the continuously magnet voltage induced by the permanently magnet each of the units per speed. This means you should use the peak line-to-line value. I am assuming this answer your question.
Ican therefore recommend to do a back EMF estimation according to the following example:
https://de.mathworks.com/help/physm....et-synchronous-motor.html
I find completely contradictory.. .
The attached model of the Mathworks people couldn't help me much.

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