A comprehensive comparison between four different C-Core hybrid reluctance motors

Performance improvement of conventional hybrid reluctance motors (HRMs) is the main aim of this paper. To reach this goal, two well-known structures are selected and two new enhanced topologies are presented based on them. This improvement is achieved by changing the PMs and windings places, so this paper compares 4 different topologies of C-Core HRMs. Stator of each structure is formed by the combination of independent magnetic structures composed of a magnetic C-shaped core, one or two permanent magnets and windings. All of the considered topologies are three-phase motors with the stator to rotor poles ratio of 6∶5. Motors are simulated and compared under the same conditions like equal outer stator diameter, air-gap thickness, stack length, nominal speed and nominal current. FEA method is employed and flux lines of one phase excitation in aligned and unaligned positions are plotted. Also, some specifications like torque-position and magnetization curves, average torque, efficiency and power density are compared.