Analysis of a novel double sided flux switching linear motor topology

A novel three-phase double sided flux switching linear motor topology with a stator-to-mover teeth ratio of 19/24 is presented. Finite element analysis of the electromagnetical performance of the initial design is conducted and shows that the topology suffers from an unbalanced EMF in terms of amplitude and phase shift between the three phases. On the other hand a low detent force is observed. By adding end-teeth to the structure, a balanced EMF is obtained, but the detent force also increases. A geometrical optimization is conducted on the end-tooth shape and stator tooth width to reduce the detent force while maintaining a balanced sinusoidal EMF. For the optimization a faster hybrid modeling tool is used. The hybrid model is based on the magnetic equivalent circuit method that employs the boundary element method to accurately determine the air gap permeances of the magnetic equivalent circuit.