Investigation on the field regulation capacity in a hybrid excited axial field flux-switching permanent magnet machine for EV application

In this paper, a novel hybrid excited axial field flux-switching permanent magnet (HEAFFSPM) machine is presented, of which the high torque capability and flexible flux regulation make it suitable for EV application. The field regulation principle of the machine is investigated, and the analogical saturation effect at pro-magnetized condition is revealed. Then the influence of the machine design parameters on the field regulation capacity and output torque of a 3-phase 6/10 stator/rotor-pole HEAFFSPM machine are analyzed by 3-D finite element analysis (FEA) method under univariate optimization condition. With the slight decrease of the electromagnetic torque, both the analogical saturation effect under pro-magnetized condition and the high flux regulation capacity are effectively improved with multivariable optimization via design of experiments (DOE) method. Finally, a prototype has been manufactured and the analysis result is validated with the experiment result