This paper presents the design and development of an axial flux PM less (AF-PML) machine which has a DC field winding on the stator to provide effective air gap flux weakening. In fact in this construction, instead using the rotor permanent magnet poles, a DC field winding is fixed on the stator to provide the desired rotor iron poles. The machine’s key features rest on a simple configuration, which allows the main air gap flux to be adjustable easily and without expend any extra cost. In this manner, the air-gap flux can be controlled over a wide range with a low cost and without demagnetization risk for the permanent magnet materials. In this paper, a full description and operating principles of double-sided AF-PML machine with internal stator is explained. Three-dimensional finite-element method (3-D FEM) results of the proposed machine coincide very well with the experimental results on a 1kW prototype AF-PML machine. The results confirm the excellent field-regulation capability of AF-PML
