IMSQ - Power balance - Improvement of computation

Power balance & iron losses

The method used to include iron losses in the power balance has been improved, whatever the computation mode, “Fast or Accurate”. Iron losses are post-computed, so they must be added to the power balance referring to the following formula:

𝑃𝑒𝑙𝑒𝑐 =𝑊𝐽𝑜𝑢𝑙𝑒 𝑠𝑡𝑎𝑡𝑜𝑟+𝑊𝐽𝑜𝑢𝑙𝑒 𝑟𝑜𝑡𝑜𝑟+𝑊𝑖𝑟𝑜𝑛 𝑠𝑡𝑎𝑡𝑜𝑟+𝑊𝑖𝑟𝑜𝑛 𝑟𝑜𝑡𝑜𝑟+𝑃𝑒𝑚

According to the analysis of the electrical equivalent scheme of the induction machine, the introduction of the iron losses seems to be more impactful in terms of absorbed power than in terms of electromagnetic power.

Indeed, the low value of the magnetizing impedance compared to the iron losses resistance indicates that the torque is not significantly impacted.

Following this observation, it was decided to impact the absorbed power and more precisely, the power factor by adding iron losses to the power balance (current and voltage are unchanged).