Hi,
I am currently working on a battery powered project that uses an ACIM. I was browsing through some older forum posts and came across some interesting responses that I was hoping to get more clarity on.
The first was a discussion on motor identification and FOC:
https://e2e.ti.com/support/microcontrollers/c2000/f/902/t/335874
1) In ChrisClearman’s response to question 1 he states that there are some customers that will use lookup tables to update their Ls value on the fly for different load conditions. Can anyone suggest an accurate way of determining an ACIM’s Ls value for different load conditions?
2) In ChrisClearman’s response to question 2 he states that some customs use their own current controllers, saying that “...there are benefits to doing things like cross coupling....”. Can anyone explain what he means by “cross coupling”, and are there any resources that can be used to learn these more advanced techniques in FOC?
The second forum post was a discussion on decoupling the D and Q current axis:
https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/283827?Remove-coupling-between-Q-Axis-and-D-Axis
3) Based on the response to Felix’s question on his current decoupling equations, am I right in saying that InstaSPIN-FOC doesn’t provide any current decoupling/compensation by default, and that the user has to add their own decoupling/compensation functions in the controller?
4) My final question is not related to any forum posts. Can anyone suggest any resources (textbooks, articles, research papers etc) on the more advanced aspects of FOC for ACIM’s, such as power optimization for varies load conditions, current decoupling/compensation techniques and different types of current control techniques other than standard PI controllers.
Kind regards
Jason
