Thermal Models in Machine Optimization

WHY THERMAL MODEL?

The starting point of any machine optimization even today, starts with a super reliable empirical formula of the slot temperature relating to the permissible current density. For example, a naturally cooled slot can have 4.5 A/sq mm and a liquid cooled can have up to 9 A/ sq mm( these values of course vary slightly with machine topology). But anyhow, while doing the design optimization, thats how we put the constraint of the current in the winding. And this is flawed with the empirical limitation and especially in this generation when we have so much computation power, it makes no sense ( ok!! this is exaggerated, it still makes sense). But at least you will agree, that one primary goal of the machine design is to utilize the iron to its full capacity, and this is very important in the analysis of the cost vs efficiency curve. If you are downplaying ampere's equation with limited current, then you have never used it to its full extent. So let the machine decide how much current it can withstand in its winding through your favourite optimization algorithm.

WHAT SHOULD WE DO?

Well, to start with, do not limit your…