current measurement for motor control

umreshpatel on Jul 26, 2018

Hi,

I was going through the sample c code provided for motor control (Isoinv_VF).

In the scalarControl.c file, gain factors Current_sincOffGainFactor and Current_sincGainFactor have been used. Current_sincGainFactor formula is given in AD7403 application note. But Current_sincOffGainFactor formula is not there.

Can anyone tell from where it has been derived?

How can i validate if the current as measured by AD7403 is correct or not?

regards

0 DOSulli2

on Aug 2, 2018 3:32 PM over 2 years ago
Hi

If you check out Figure 3 in the app note - this is simply a scaling as a result of the signal being offset around 50% and specified max range of 18.75% to 81.25%: so (81.25%-50%)/(81.25%-18.75%)
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0 umreshpatel on Aug 3, 2018 10:05 AM over 2 years ago

Thank you sir for the information.

If I use the formula as given in application note on page 10( current reading as a function of actual winding current), then i do not need to use the offset gain. Am i correct?

regards
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0 DOSulli2

on Aug 7, 2018 1:27 PM over 2 years ago
Yes that's correct.
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0 umreshpatel on Aug 8, 2018 8:23 AM over 2 years ago

Thank you for providing the information.

Regards
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0 EZAdministrator

on Aug 24, 2018 12:52 PM over 2 years ago
This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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EZ Admin
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