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This paper proposes a new position sensorless control for interior permanent-magnet synchronous motor (IPMSM) drives fed by overmodulation mode pulsewidth modulation (PWM) voltage source inverter. It is attractive to expand the speed range of the IPMSM for application to electric vehicles, electrical household appliances, and so on. An overmodulation mode(More)
For consumer electronics and appliances, rectifier circuits of the capacitor input type are generally used. The various harmonics generated within such a power system become a serious problem. Various studies to reduce these effects have been presented so far. However, most of these employ switching devices, such as MOSFETs and the like. Removing the need(More)
A technique for the regenerative control of a voltage source inverter is described. In the proposed equipment, the rectifier bridge is utilized for regeneration through a medium of a DC reactor. Another type of regenerative control that involves a modified Cuk converter method is described. A frequency analysis approach using the switching function is used(More)
あらまし 不具合修正時の修正前ソースコード片を検索キーとしたコードクローン検索による類似不具合の検 出を実証的に評価した.これまでにオープンソースソフトウェアを対象とした研究により,コードクローン検索 による類似不具合発見の有用性が確認されている.そこで本論文では,商用開発のソフトウェアを対象としコー ドクローン検索による類似不具合発見を商用開発の現場への適用する際の指針となることを目指す.対象はパナ ソニック MSE株式会社において三つの異なるプロジェクトで開発された 3 件のソースコードであり,試験工程 での不具合修正に伴う修正履歴が記録されたリリース済のものである.修正履歴に記録された不具合修正前の ソースコード片を検索キーとしコードクローン検索を実施し類似不具合を検出した.その結果,対象とした商用(More)
The five-level PWM inverter has many advantages such as ability to operate the AC motors or the power compensator with very large capacity in nearly sinusoidal current waveforms. For these reasons, these applications have just begun to study. However, this circuit must provide four DC power supplies for supplying the active power. In this paper, we propose(More)
Various harmonics in power systems are measured typically by the heterodyne receiver in analog techniques or the FFT (fast Fourier transform) analyzer in digital methods. Using these methods, the harmonics can be analyzed over a wide range of frequency. However, circuit configurations using such methods become very complicated and the devices become too(More)
A converter is presented which can reduce harmonics like the conventional 12-pulse converters with input three phase transformers. This circuit has the center tapped reactor which controls the DC link current, at different two values. The converter need not use the input three phase transformer that usually makes the cost higher. The proposed circuit has(More)
The line impedance could be measured by means of only passive elements such as inductors or resistors, that is presented at first. However, as the voltage and current used for the measurement are increased, the size of the inductor or resistor being used also needs to be increased, so in practice it would be virtually impossible to make an accurate(More)
Among various storage devices EDLCs offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilization in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series(More)
The line impedance could be measured by means of only passive elements such as inductors or resistors, that is presented at first. However, as the voltage and current used for the measurement are increased, the size of the inductor or resistor being used also needs to be increased, so in practice it would be virtually impossible to make an accurate(More)