Quick Prediction of Losses During Magnetization State Changes in Variable Flux Machines

In order to effectively estimate the additional energy required to change the magnetization state in a variable flux machine, this process needs to be characterized as precise as possible and as quick as possible. Therefore, a loss estimation model for magnetization state changes based on a mix of FEA data and analytical calculations for the iron, copper and magnet losses in variable flux machines is presented and evaluated in this paper. Also, an approach to quickly estimate the current pulse required to set a desired magnetization state is derived. The loss model allows predictions that are much faster than FEA calculations with good accuracy.