There are two major issues with the motor rating.
- Maximum or transient torque (or power)
- Maximum Continuous power.
I notice that motor saturation is often quoted. Information I have been provided by manufacturers indicates saturated and unsaturated values for equivalent circuit parameters as a function of slip. I know that in a transformer sub-synchronous operation increases the core hysteriesis losses and can lead to vibration and heating resulting in damage. I have also been told by VSD manufacturers that for low speed operation drives are often oversized due to saturation issues. Can you tell me what effects result from saturation in induction motors and under what conditions does this become a problem?