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Originally Posted by MPaulHolmes
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
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It would be *AWESOME* to have the starting torque of a DC motor available to an AC motor. I guess I have some reading to do .. and to see if the parameters that the industrial controllers measure will correlate to what the PIC libraries want to see.
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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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I'll see if I can remote into work and read some of the parameters. I'll post what I find.