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Cooke.Ernest
Cooke.Ernest
Associate III
April 18, 2017
Question

SPINFamily Evaluation Software - BEMF Calculation

  • April 18, 2017
  • 2 replies
  • 1934 views
Posted on April 18, 2017 at 14:07

Hi,

When I am using the BEMF compensation configuration within the SPINFamily Evaluation Software, I input the Application Parameters and the Motor Parameters for my particular motor. 

0690X00000606nmQAA.png

When I press the �Evaluate� button at the bottom right of the menu, the following Device Configuration Values are calculated:

KVAL_HOLD

KVAL_ACC

KVAL_DEC

KVAL_RUN

ST_SLP

INT_SPEED

FN_SLP_ACC

FN_SLP_DEC

These calculated values can then be written to the device and can be seen in the Phase current control tab within the �Device Configuration� menu.

 0690X00000606nnQAA.png

How are the Device Configuration Values calculated from the values that I have inputted?

Is there a particular calculation that must be used?

Kind Regards,

Ernest

#dspin #dspin-gui #powerstep01 #bemf #pcc009v2-eval6470h-spinfamily
This topic has been closed for replies.

2 replies

Enrico Poli
Enrico Poli
ST Employee
April 19, 2017
Posted on April 19, 2017 at 15:09

Hi,

the calculations performed by the tool are the ones described in details into the

http://www.st.com/resource/en/application_note/dm00061093.pdf

.
Cooke.Ernest
Cooke.ErnestAuthor
Associate III
April 20, 2017
Posted on April 20, 2017 at 14:39

Hi Enrico,

Thank you very much for the information you have sent me in relation to the calculations.  I found them to be helpful.

There are some further questions I would like to ask. 

From the values I have entered I was able to calculate the Hold duty-cycle, Intersect Speed & Starting Slope perfectly.

I got a value of 30% for the acceleration, deceleration and run duty cycles instead of 46.5% (See below).

However I was unable to calculate the Final Slope Values (Acceleration & Deceleration).  

Is it possible you could find the values which I am unable to calculate properly.  The parameter values to input are shown below.

0690X00000606aBQAQ.png0690X00000606pOQAQ.png

Thanks,

Ernest

Enrico Poli
Enrico Poli
ST Employee
April 26, 2017
Posted on April 26, 2017 at 14:43

Did you considered the conversion between rms current and peak?

Can you write your calculation?

David Walker
David Walker
Associate
April 19, 2017
Posted on April 19, 2017 at 18:55

I came up with an alternative way to compute the motor parameters. It is here:

https://community.st.com/0D50X00009XkW2fSAF

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