How to Control Slip in Induction Machines?

[tim9000]

Hi,
Say you wanted to have a generator or motor stay at near 90degrees for maximum torque while generating or motoring, over various loads or over various supply frequencies.
I assume there is some established method of controlling this (varying the rotor resistance with feedback perhaps?) does anyone know what it is, or have any literature on it?

Cheers!

 

[milesyoung]

I assume there is some established method of controlling this ...

You use a VFD as a component in vector control.

varying the rotor resistance with feedback perhaps?

No, you generally try to avoid having to interface anything with the rotor. The stator is where it's at.

 

[tim9000]

You use a VFD as a component in vector control.No, you generally try to avoid having to interface anything with the rotor. The stator is where it's at.

Damn, I was hoping it wouldn't come to variable frequency drives.
Ok, thanks anyway.