Design Principles and Performance Evaluation of a Novel Axial Flux Consequent-Pole Resolver

In this paper, a new structure for an axial flux consequent pole resolver (AFCPR) with concentrated windings on the stator is presented and analyzed. In this proposed design, the magnetic poles of the rotor are created by symmetrical saliences in the ferromagnetic core of the rotor instead of using permanent magnets, arranged in an alternating pattern with the same magnetic direction. By applying current to the concentrated windings of the stator along the axial direction, a suitable flux density is generated to produce iron poles. The main innovation of this structure lies in the elimination of permanent magnets and the simple, lightweight, and robust design of the rotor, which enhances reliability in position and speed estimation. The performance of the proposed resolver has been examined using two different winding patterns to generate sinusoidal and cosine signals, in order to analyze their effects on improving functional harmonics and reducing position error. Three-dimensional simulations using the 3D Finite Element Analysis (3D-FEA) method demonstrate that this resolver has adequate accuracy in position estimation and that the selection of the appropriate winding pattern can significantly improve positioning accuracy.