Investigation of the inter-stator current control for long primary winding segmented PMLSM used in electromagnetic launch system

In order to not only reduce thrust fluctuations but also improve transient state performance of primary winding segmented PMLSM(PWS-PMLSM) applied in electromagnetic launch system, this thesis proposes the inter-stator current synchronous tracking and predictive control (ISCSTPC) algorithm based on two inverters alternating supply method for multi-stators PMLSM. The study adopts the finite element model (FEM) to calculate variation rules of electromagnetism parameters when shuttle moves among stators. For this, the accurate PWS-PMLSM mathematical model and control system models are established according to the above mentioned rules, respectively. Through the calculation and simulation on inter-stator thrust ripple and on transient response ability, the experimental result illustrates that the current control algorithms achieve the most satisfied effect for EML.