I have to design a controller for three phase BLDC motor. In BLDC motor, for each hall sensor signal combination we have to to energize two sets of stator phases. But how to correctly identify which phase has to be energized for a particular combination? In application notes by Microchip or TI, there are lookup tables showing sequence of energizing coils, but how did they identify that sequence? Is it through experiment or are we randomly selecting two phases?
Electronic – BLDC controller
brushless-dc-motorsequence-detectorswitchingwinding
Related Solutions
Implementing a current loop should not require field oriented control. You should be able to have a PI controller driven by a current feedback (e.g. see here: http://irtfweb.ifa.hawaii.edu/~tcs3/tcs3/0405_Servo_review/onaka_docs/2000_articles_control.pdf and here: http://www.drivetechinc.com/articles/curbldc3.pdf ). I would think you need two independent loops/feedback for a three phase system. What speed are you running your loop at? What are the stability issues you're seeing? You should tune your current loop with all the other loops disabled.
Since you mention "average" current and measuring on one phase I'm wondering what exactly you're doing. Closed loop current control is traditionally controlling the "instantaneous" current and is the highest frequency/bandwidth, innermost, loop in a closed loop motion control system.
Make different ground (at least by names) The power ground is Vso, th logic ground is Vss. The minus of the battery goes connected to Vso, while the the arduino GND goes to Vss. Now you have two systems completely separated - power-> high current, logic->small currents. Now you need to to join these grounds to same potential by connecting a short or a shunt resistor in case you will be monitoring the current as well.
EDIT:
Your circuit lacks the ITRIP connection, so this could be the main issue.
Best Answer
This article explains the idea and principle of operation of BLDC motors, which should help you make a decision on what logic to use.