In this paper, the design and analysis of a 7.5kW 4 poles line-start synchronous reluctance motor (LS-SynRM) are investigated by considering the maximum inertia and power factor. Since the LS-SynRM must operate at synchronous speed, the synchronization capability, determined by the system inertia, is a crucial performance parameter for various industrial applications. Electromagnetic and mechanical transient analysis of a finite element analysis (FEA) are performed to analyze the maximum inertia under the condition of 380V-60Hz voltage. The initial model is designed by considering the maximum inertia. Moreover, the power factor is also important performance index in industrial applications according to IEC 60034-1. Therefore, a bridge design is proposed based on the initial model, and the improved model is designed by considering the efficiency, power factor, and mechanical stress. To improve the efficiency and power factor, the barrier optimal model is designed based on the improved model. Finally, the barrier optimal model of 7.5kW 4 poles LS-SynRM is manufactured, and experiments are performed to verify the steady-state and starting performance. In the steady-state performance, the efficiency and power factor of LS-SynRM are 93.89% (>92.6% IE4) and 78.1 (>78% IEC 60034-1), respectively. It showed about a 1.59%p higher efficiency than that of IM with IE3 efficiency.

In this paper, the design of novel slotless permanent magnet synchronous motor (PMSM) for a collaborative robot was studied considering the manufacture process of winding. The winding manufacture process of novel slotless PMSM was proposed in three steps. First, the two types of coil units were manufactured based on the winding jig to assemble the coil units. Second, the coil unit was manufactured using the injection molding based on the plastic material such as polyphenylene sulfide (PPS). Third, the units of the coil were assembled to form a stator winding. Considering this manufacture process of winding, the slotless motor design was studied for the collaborative robot. For the design and analysis of slotless motor, finite element analysis (FEA) was performed through ANSYS Maxwell. The electromagnetic performance was analyzed according to the pole-slot combination. Considering the space of the collaborative robot, the basic model was designed. Based on the basic model, the electromagnetic performance was analyzed according to the design parameters such as the thickness of magnet and yoke and turns per slot. Considering the torque and current density, the final model was designed. To verify the FEA results, the slotless motor was manufactured and the experiment and FEA results were compared.

In this paper, a 150 W small wind power generator which has a permanent magnet synchronous generator type is proposed with a new straight shape stator and rotor to reduce the cogging torque. The advantages of the proposed structure are introduced through a comparison between the basic and the proposed models. By comparing the pole slot combination of the proposed generator, the combination with optimal cogging torque characteristics was selected. The electromagnetic characteristics of the proposed shape are analyzed for design variables using a finite element analysis of ANSYS 2021 R1 Maxwell. The final model of the proposed structure is designed by considering the cogging torque and electromagnetic characteristics of the generator. The electromagnetic and structural simulations of the final model are performed to satisfy the required performance of the generator and mechanical safety. To verify the FEA results of the final model, a prototype is manufactured, experimented, and compared with the FEA results.

This paper deals with the design using the magnetic equivalent circuit (MEC) of an external rotor brushless DC motor (BLDC) for drones applied with a halbach magnet array. Since magnetic circuits are similar to electrical circuits, design elements can be parameterized by applying Kirchhoff's law, and saving time and simplifying preliminary design compared to finite element analysis (FEA). When the Halbach magnet array is applied to the motor, the characteristics of the motor can be improved according to the permanent magnet thickness and pole ratio. If the halbach magnet array is applied to the motor, the main magnetic flux can be improved, but most of the designs are intuitively designed by analyzing tendency through FEA. In this paper, to systematically analyze the halbach magnet array design, which relied on experience, a MEC was constructed through inductance analysis. A MEC was established in consideration of the number of segments and the magnetization angle of the halbach magnet array, and based on this, an optimization of motor design was conducted to prove the validity of the design and analysis.

This paper presents the rotor optimization to improve the motor efficiency for air ventilation system in railway station. SynRM creates a salient ratio through a barrier inside the rotor, and electrical characteristics can be improved through magnitude of this ratio. However, depending on the location and shape of the barrier, electromagnetic output characteristic(torque, efficiency, and ripple) may change due to saturation level and permeance variance even though the salient ratio is the same. Therefore, in this paper, design variable capable of affecting saturation and permeance variance such as the position of the barrier and the salient ratio is analyzed, and the optimal shape that can obtain the best output under the constraint condition is derived through the RSM(Response Surface Method). Finally, the validity of this study was verified through FEA simulation and experiment.

In this paper, the design and analysis of a line-start synchronous reluctance motor (LS-SynRM) is performed considering the maximum inertia and power factor. Because LS-SynRM must be operating the synchronous speed, the capability of load synchronization is important for the various industrial application. The electromagnetic and mechanical transient analysis of a finite element analysis (FEA) is used to analyze the maximum load inertia. Furthermore, because the power factor is also important index in the industrial application according to IEC 60034–1, the bridge design is performed considering the power factor and mechanical stress. Based on the basic model, the optimal design is performed to improve the power factor. The design parameters, constraints, and objective functions are considered to optimization of LS-SynRM. Finally, the optimal model of LS-SynRM is manufactured, and experiment is performed to verify FEA result.