As international regulations of motor efficiency are strengthened, the line-start synchronous reluctance motor (LS-SynRM) is being studied to improve the efficiency of the electrical motor in industrial applications. However, in industrial applications, the power factor is also an important performance index, but the LS-SynRM has poor power factor due to the saliency characteristic. In this paper, the rotor design of LS-SynRM is performed to improve the efficiency and power factor. First, the barrier design is performed to improve the efficiency and power factor using the response surface method (RSM). Second, the rotor slot design is performed according to the length of bar for synchronization. Lastly, the rib design is performed to satisfy the power factor and the mechanical reliability. The final model through the design process is analyzed using finite element analysis (FEA), and the objective performance is satisfied. To verify the FEA result, the final model is manufactured, and experiment is performed.

This paper establishes an analysis method of permanent magnet assistant synchronous motor (PMA SynRM) with asymmetric barrier. In a general motor analysis method, the inductance is calculated using the dq-axis vector diagram. In addition, the characteristics of the motor are analyzed by separating the mag-netic torque and the reluctance torque. However, in an asymmet-ric motor, the magnetic neutral plane (MNP) is shifted because the magnetic permeance is asymmetric. Therefore, it is difficult to analysis the characteristic of the asymmetric motor because it in-volves errors applying the general analysis method. In this paper, the magnetic property of the asymmetric motor is analyzed and the analysis method of asymmetric motor is proposed. To verify the proposed analysis method, PMA SynRM is designed as a conventional model. Furthermore, the magnetic torque and reluc-tance torque are separated through the proposed analysis meth-od. The validity of the proposed analysis method is verified through finite element analysis (FEA) and manufacture of the conventional model.

This study proposes a novel rotor shape for the spoke-type per-manent magnet synchronous motor (PMSM) to improve its pow-er performance by changing permeance and increasing magnetic flux density strength in the air gap. Applying a wedge-shaped barrier to the rotor results in a reluctance change in areas of the rotor that have saturated magnetic flux density, which changes the permeance in the air gap. In addition, magnetic flux can be transmitted to the air gap to increase the air gap magnetic flux density strength. In this study, a wedge-shaped barrier was used to maximize air gap magnetic flux density and torque, thus elimi-nating the magnetic flux density saturation area that negatively affects torque. This wedge-shape barrier also changes the induct-ances. The results confirmed that average torque improves as magnetic flux density saturation area is removed.