Design Trandeoff between Flux Regulation Capability and DC Winding Induced Voltage in Hybrid Excitation Switched Flux Machine

In this paper, the design tradeoff between the flux regulation capability and the DC winding induced voltage of the hybrid excited switched flux (HESF) machine is analysed. The magneto-motive-force (MMF)-permeance model is established firstly to analyse the airgap flux density and the DC winding induced voltage. Then, the magnetic circuit concept is applied to analyse the influence of the local magnetic saturation in stator lamination of the HESF machine. It is found that the DC winding induced voltage will be much larger under flux enhancing mode, whilst it will be lower under the flux weakening mode, and no flux regulation mode. The design tradeoff between DC winding induced voltage and flux regulation capability is then proposed for the HESF machine. All the analysis are verified through the finite element analysis.