Quote:
Originally Posted by MPaulHolmes
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.
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Here's a 575 VAC, 250 HP, 228 amp motor running on a belt conveyor
Motor nameplate info
Rated voltage 575 VAC
Rated Current 228 amps
Rated Horsepower 250 HP
Poles 4
Rated rpm 1775 rpm
P 82 Motor excitation current 57.7 amps
P 90 Motor constant R1 32.1 ohms
P 91 Motor Constant R2 10.73 ohms
P 92 Motor Constant L1 15.22 mH
P 93 Motor Constant L2 15.22 mH
P 94 Motor Constant X 5.63 ohms
P859 Torque Current 220.2 amps
Attached is a few pages from the mitsuibishi controller manual explaining the parameters. I don't see a rotor time constant ...
The file is too large to attach. I put it in dropbox - hope it works for everyone. Let me know one way or the other!
https://dl.dropboxusercontent.com/u/...ual_Tuning.pdf
For the record, this is a Mitsubishi A760 Variable Frequency Drive (VFD or controller).