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.

This paper is a comparative study of pole–slot combinations with fractional slot concentrated windings in an outer rotor permanent magnet synchronous generator (ORPMSG) for a hybrid drone system. Fractional slot machines have been studied for automotive applications because of their high performance and simple winding manufacturing, compared with those of integer slot machines. In this study, four pole–slot combinations of ORPMSG with fractional slot concentrated windings were selected for comparison with the performance of the hybrid drone system. Based on the results of a finite element analysis (FEA), the machines were analyzed for cogging torque, back electromagnetic force (BEMF), torque, and electromagnetic loss under the same conditions as the machine specifications. Among the four pole–slot combinations of the ORPMSM, a one pole–slot model of the ORPMSG was selected, considering the performances of the machines. The selected pole–slot model of the ORPMSG was manufactured, and experiments were conducted on the manufactured model to verify the FEA results. Finally, the effectiveness of the comparative study of pole–slot combination with fractional slot concentrated winding in ORPMSM was verified by comparing the FEA and experimental results.

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, 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.

In this paper, the analysis and design of 11kW 6-pole LS-SynRM is performed according to the operating points using an electromagnetic and mechanical transient analysis of finite element analysis (FEA). The operating points of LS-SynRM are determined by the dq-axis inductances and analyzed based on the voltage and torque equation under the condition of the rated load torque and voltage. Furthermore, design parameters of LS-SynRM are selected such as a turn per slot, a stack length, and a barrier design to analyze the operating points. Based on the analysis result, the basic design of LS-SynRM is performed considering the efficiency and power factor. Finally, the optimal design is performed for improving the efficiency and power factor. To verify FEA result, the optimal model is manufactured, and the experiment is performed.

In this paper, the impedance of IM is analyzed according to the electrical connection instead of the mechanical connection. The electrical connection is equal the mechanical connection according to voltage vector position. The inter-turn fault diagnosis algorithm is proposed according to the voltage vector position. Co-analysis of a finite element analysis (FEA) and control circuit simulation is performed to verify the proposed inter-turn fault diagnosis algorithm. Furthermore, IM and terminal box are manufactured, and the experiment is performed to verify the inter-turn fault diagnosis algorithm.