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Absfmct-This paper proposes novel MPPT method of photovoltaic system with temperature coefficient. The conventional CV(Constant Voltage) and PO(Perturbation and Observation) methods have the weak problem about the radiation and temperature change. Thus, in this paper, in order to improve this problem, the optimal voltage and current is determined and the MPPT control is performed. The MPPT algorithm proposed in this paper analyzes the performance about radiation and temperature change and proves the validity.I.

This paper is development of single-phase brushless DC motor with outer rotor for ventilation fan. Cogging torque causes the noise․vibration to greatest impact on ventilation fan. Asymmetric notches are applied to tapered-teeth for cogging torque reduction of single-phase brushless DC motor. Initial model is notchless and proposed model is applied 2 asymmetric notches. The proposed method is proved motor characteristic through finite element analysis(FEA). Also, experimental results verify that the proposed model considerably reduces cogging torque and have the good sound quality in ventilation system.

-This paper presents the improved back-EMF of Interior Permanent Magnet Synchronous Generator(IPMSM) for small hydropower generator. To improve back-EMF characteristics, the size and position of notch are applied to the rotor. In addition, parametric analysis of the notch size and position was performed. Finally, the back-EMF characteristic analysis are confirmed by the experimental results.