Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control

ChiefsBuggy · 06-13-2011, 12:18 AM

Paul,

My breadboard runs your code into a transistor network into my scope to prove the logic. I'm still not able to convince myself the flux angle position logic is right at speed. Also, the low RPM torque logic doesn't seem to be there.

I'm not driving a motor yet as I haven't built up a high-current IGBT driver yet.

The second project I'm working for you is getting a decent supply out of the isolation transformers. It looks like we need a feedback loop to maintain a consistent voltage over load. The 4011 has more processing power to do with, but I'd need to write a feedback control to do with (probably with a software PWM as we are out of PWM slots).

So, still working on it.

Good design! Its evolving in my head right now, but you have made incredible progress so far.

AN908 is a great seed, but its time to make it produce fruit! ;-)

Jim

PS: Jack's right.... You Da Man!

06-13-2011, 12:18 AM	#541 (permalink)
ChiefsBuggy EcoModding Lurker Join Date: May 2011 Location: Atlanta, GA/Fairhope, AL Posts: 17 ChiefsBuggy - '66 VW Dune Buggy Type 1 w/ Boss Bug body Bondo? Thanks: 0 Thanked 6 Times in 5 Posts	Paul, My breadboard runs your code into a transistor network into my scope to prove the logic. I'm still not able to convince myself the flux angle position logic is right at speed. Also, the low RPM torque logic doesn't seem to be there. I'm not driving a motor yet as I haven't built up a high-current IGBT driver yet. The second project I'm working for you is getting a decent supply out of the isolation transformers. It looks like we need a feedback loop to maintain a consistent voltage over load. The 4011 has more processing power to do with, but I'd need to write a feedback control to do with (probably with a software PWM as we are out of PWM slots). So, still working on it. Good design! Its evolving in my head right now, but you have made incredible progress so far. AN908 is a great seed, but its time to make it produce fruit! ;-) Jim PS: Jack's right.... You Da Man!