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

MPaulHolmes · 08-31-2014, 08:45 PM

Edit: haha. Thanks e*clipse!

One thing that I know is needed for the ACIM case is the rotor time constant of the motor. Fortunately, it seems to always be in the range of 0.035 to 0.1. Closer to 0.1 for small motors, and toward 0.035 for large ones. At least the Tumanako devel list used 0.035 or something close to that for their large ACIM. I would be interested in hearimg what sort of characteristics they measure, and the values. Worst case, I think we can manually tune the pi loop. Did you know that you can make the AC motor behave just like a series wound dc motor just by setting Id to Iq?? That sets the field current to the same as the torque causing current.

08-31-2014, 08:45 PM	#1064 (permalink)
MPaulHolmes PaulH Join Date: Feb 2008 Location: Maricopa, AZ (sort of. Actually outside of town) Posts: 3,832 Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000 Thanks: 1,362 Thanked 1,202 Times in 765 Posts	Edit: haha. Thanks e*clipse! One thing that I know is needed for the ACIM case is the rotor time constant of the motor. Fortunately, it seems to always be in the range of 0.035 to 0.1. Closer to 0.1 for small motors, and toward 0.035 for large ones. At least the Tumanako devel list used 0.035 or something close to that for their large ACIM. I would be interested in hearimg what sort of characteristics they measure, and the values. Worst case, I think we can manually tune the pi loop. Did you know that you can make the AC motor behave just like a series wound dc motor just by setting Id to Iq?? That sets the field current to the same as the torque causing current. __________________ kits and boards