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Recently, a permanent magnet type synchronous motor (PMSM) has been widely used. The PMSM cannot start without an inverter. The authors have proposed in a previous paper a novel self-start type PMSM which moves as induction motor at asynchronous speed region and moves as synchronous motor at synchronous speed. It was surface type PMSM and had relatively large area squirrel-cage region. This paper...
This paper presents experimental results of a low speed and low capacity multi-polar synchronous generator system directly coupled to a vertical-axis type windmill. In the paper, we introduce the outline of the 5kW multi-polar synchronous generator which generates the electric power efficiently at the low speed from 50rpm to 180rpm. The generator is produced by a magnetic powder core for cost reduction...
The authors proposed a novel segment type switched reluctance motor (SRM) and showed the torque ripple could be reduced by increasing the phase number. This paper presents the relationship between the exciting current and the number of phases and segment cores. Transient analysis by the finite element method is carried out when the number of phases is 4 to 6. For torque ripple reduction the best number...
The goal of this research is to reduce the common mode current in inverter system. To reach the goal, it is important to understand the behavior of common mode current precisely in the inverter circuits. Recently, computer simulation is widely used for this issue according to create good simulation model for individual electric component in used inverter system. The simulation results/accuracies are...
This paper presents a newly developed magnetic powder core for a multi-polar synchronous generator. The magnetic characteristics of the magnetic powder core are greatly improved in comparison with the previously produced one. In addition, the multi-polar synchronous generator with molded-in magnetic powder stator is modeled in order to analyze the performance characteristics with the FEM analysis...
Recent developments of power electronics technology, low-loss iron core materials and highly efficient permanent magnet, etc have made it possible to realize a small size, high or ultra-high speed, and high performance electrical drive system. We designed and built a trial ultra-high speed drive system of 2 poles, 5 kW, 240,000 rpm and had described our prototype system and showed some experimental...
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