Other Parts Discussed in Thread: TMS320F28069M
Hello,
I have been learning about inverter design for BLDC motors. I am very interested in using the C2000 micro-controllers with Instaspin-Motion in a new speed controller. I came across the TIDM-1003 Reference Design and I noticed that document shows three current sense resistors shunted to ground--one for each phase--to monitor the current on each phase.
Is it really a requirement to have 3 separate current sense resistors? Or can I get by using 1 or 2 current sense resistors? What would be the consequences of doing so? Can I still make use of the C2000 Instaspin motion features? I am asking because I am mostly concerned about minimizing the impact to board space (and I am hoping to make use of an existing FET board that does not have any existing current sense resistors in the paths to ground with as little modifications as possible). Any ideas here?
Thanks,
John