This paper deals with the modeling of a novel permanent magnet (PM) pole shape for a surface-mounted permanent magnet (SPM) motor so as to generate sinusoidal back EMF and linear electromagnetic torque. Conventional SPM motors have a square-shaped PM pole structure; therefore, square back EMF is generated along with the torque pulsations. This novel SPM motor has sinusoidal PM pole shape in the axial direction; therefore, sinusoidal back EMF is generated due to the sinusoidal magnetic flux distribution. Sinusoidal back EMF eliminates most of the cogging torque; thus, a linear electromagnetic torque is generated. Square and sinusoidal current excitation is provided as to analyze the electromagnetic torque characteristics of SPM motor models. As compared to square current excitation, sinusoidal current excitation shows better linearity as well as average electromagnetic torque for the novel SPM motor model. 3-D finite element analysis (FEA) is utilized to analyze and compare the back EMF, cogging torque, and electromagnetic torque of conventional and proposed novel PM pole shaped SPM motor models for both square and sinusoidal current excitation.

In this paper, a new topology of a single-phase flux switching permanent magnet motor (FSPM) is presented. Unlike conventional FSPMs, the airgap flux flows in the axial direction, therefore, it is named as the flux switching axial flux permanent magnet motor (FS AFPM). The proposed single-phase FS AFPM has a compact disc-type structure, four stator pole teeth and two rotor pole teeth (4/2 combination). However, number of the stator poles as well as the rotor poles can be easily increased, due to an enlarged circumferential length. It has two discs, one for the stator and other for the rotor. Like conventional FSPMs, this machines has a simple salient rotor pole structure. Along with the armature windings, the permanent magnets (PMs) are also embedded in the stator. A 3D finite element analysis (FEA) is carried out for the characteristic analysis of the proposed single-phase FS AFPM. For the enhancement of the self-starting torque capability and unidirectional rotation, the rotor pole is tapered.

In this paper, a new single-phase flux switching axial flux permanent magnet motor (FS AFPM) is presented. It has a double stator and single rotor (DSSR) disc-type structure. The rotor disc is a simple salient pole rotor, and it is sandwiched between the two stator discs. The permanent magnets (PMs) are embedded in the stator discs, which also contain the single-phase windings. To enhance the self-starting torque capability and unidirectional rotation, the rotor pole is chamfered. The characteristic analysis of the proposed DSSR type single-phase FS AFPM is carried out using the 3D finite element analysis (FEA).

This paper attempts to design a direct driven axial flux permanent magnet synchronous generator (AFPMSG) with better accuracy considering magnetic flux leakages and fringing effect, using D ^{2} L method. Design results of conventional and improved design processes are analyzed and compared using 3D finite element method (FEM). Single and multi-stack AFPMSG topologies are designed by using an improved design process. FEM structural analysis is utilized to improve power to weight ratio of three-stack AFPMSG. Finally characteristics of both single and three-stack AFPMSG topologies are analyzed and compared using 3D FEM analysis.

In this paper, the flux focusing slotted double stator and single rotor (DSSR) axial flux permanent magnet motor (AFPM) is analyzed. It has high torque density due to its inherent compact multipolar disc-type structure, which is suitable for direct-driven and in-wheel applications. Permanent magnets (PMs) are inserted in the rotor core and the stator has concentrated double layer winding. The winding arrangement is determined by the star of slot voltage method. To select the stator slots and rotor poles combination, comparative winding analysis is carried out using the winding function theory. Finally, a 3D finite element method (FEM) is utilized for the characteristic analysis of the machine.