It is well known that the the mechanical speed control requires a specific estimation of the flux which is dependent on the IM stator resistance. As a consequence, this estimation may face some problems because of the stator resistance variation. On the other hand, the value of stator resistance for electrical machine (with high power) is too small.
For the case of electrical machine (with high power), since the value of stator resistance is too small, has the stator resistance estimation a technical signification?
Some techniques such as direct torque control DTC, could be achieved to control the induction motors without required the values of the stator resistance, especially in the Medium and high speed value. The neglecting the stator resistance does not effect on the DTC controller. Also, as you kindly mentioned that the value of the stator resistance in high power is very small so, when neglecting its effect the approximation is acceptable
pLEASE FIND THE ANSWER IN THIS ARTICLE: M Rashed, AF Stronach - IEE Proceedings-Electric Power Applications, 2004 - IET
This paper I think can help you:
http://web.eecs.utk.edu/~tolbert/power_electronics/pubs/bose_trans_pe_may_1998.pdf
For high power applications, stator resistance estimation is not of technical significance.
In practice, the stator resistance is prone to large variations caused by
temperature which indeed are very likely to occur. We should consider about it and one of the method is applying DTC
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