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Reduction of EMI Generated by a PWM Inverter-Fed AC Motor Drive System
Satoshi Ogasawara,Hirofumi Akagi 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper deal with problems of leakage current, shaft voltage, bearing current, and EMI, in valiable-speed AC drives. The originating mechanism is illustrated with a high-frequency equivalent circuit. Reduction methods are classified in to six categories based on the equivalent circuit. Some experimental results show that a common-mode transformer (CMT) and a common-noise canceler (ACC) can solve the problems, which have been proposed by the authors.<br/>
Maximum-Efficiency Tracking Scheme for Piezoelectric-Transformer Inverter with Dimming Control
Satoshi Nakashima,Hiroshi Ogasawara,Hidenori Kakehashi,Tamotsu Ninomiya 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper provides a solution for the problem of efficiency decrease caused by load variation. A novel control scheme of tracking the PT's operation frequency for the maximum efficiency is proposed. As a result, a high efficiency over 80% has been achieved even under the output-current decrease down to 10% of the full load current.
Equivalency of Series-Parallel Hybrid System Using Planetary Gear and Hybrid System Using EVT
Yuki Kubo,Satoshi Ogasawara,Masatsugu Takemoto 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The series-parallel hybrid system using a planetary gear realizes low-fuel consumption and restraining of the exhaust gas by performing an optimal control of the internal combustion engine (ICE) with various driving modes. On the other hand, the hybrid system using electric variable transmission (EVT) has been proposed. This paper presents a theoretical consideration on equivalency of the series-parallel hybrid system and the hybrid system using the EVT. Additionally, some experimental results and simulation results are compared to confirm equivalency of the two systems.
Kanako Tsushima,Satoshi Ogasawara,Koji Orikawa,Masatsugu Takemoto,Kenji Koyama 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper deals with electromagnetic interference radiated from air-conditioner piping that acts as an antenna and emits electromagnetic noise. The current distribution on the piping is measured by using a near-field magnetic probe, and the distribution mode is analyzed. The results show that the piping resonates at the frequencies where the piping length accords with λ/4, 3λ/4, and 5λ/4, and radiates electromagnetic noise as a monopole antenna. This radiation mechanism is confirmed by simulations using the CST EMC Studio electromagnetic field simulator.
Soonhwan Hwang,Satoshi Ogasawara,Koji Orikawa,Masatsugu Takemoto 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes an interleaved AC/DC buckboost converter with active power decoupling(APD) using the modular design method. It also introduces the control method using the sliding mode control (SMC) strategy for the proposed circuit. The contribution of this paper was first proposed by AC/DC Interleaved Converter circuits with APD functions, which allowed the size of input filters and magnetic cores to be reduced. Additionally, we have applied SMC strategies to the control system to be robust for the disturbance or model uncertainty. The effectiveness of the proposed circuit and control method is shown by simulations using MATLAB/SIMULINK.
Hybrid Sensor-less Control of Permanent Magnet Synchronous Motor in Low-speed Region
Yasuhiro Yamamoto,Hirohito Funato,Satoshi Ogasawara 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes a method of improving the stability in sensor-less control of permanent magnet synchronous motors. The control method for low-speed region is divided into two: One is a high frequency method, which involves a problem of reverse rotation once misdetection of the permanent magnet polarity should occur, and another one is a current drive method, which has a problem that phase and speed oscillations are caused by quick speed changes. Hence, authors propose adoption of the current drive method for the basic control system with added compensation of stabilization by means of the high frequency method. This combination secures stable control with no risk of reversal and less vibration. In addition, authors have also considered a frequency separation filter of a shorter delay time so that current control performance will not lower even when high frequencies are introduced. This filter has achieved simplified compensation using repetitive characteristic through the utilization of the periodicity of high frequency current. Simulation and experiment have been conducted to verify that the stable performance of this system is improved.
Hybrid Sensor-less Control of Permanent Magnet Synchronous Motor in Low-speed Region
Yamamoto, Yasuhiro,Funato, Hirohito,Ogasawara, Satoshi The Korean Institute of Power Electronics 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.4
This paper proposes a method of improving the stability in sensor-less control of permanent magnet synchronous motors. The control method for low-speed region is divided into two: One is a high frequency method, which involves a problem of reverse rotation once misdetection of the permanent magnet polarity should occur, and another one is a current drive method, which has a problem that phase and speed oscillations are caused by quick speed changes. Hence, authors propose adoption of the current drive method for the basic control system with added compensation of stabilization by means of the high frequency method. This combination secures stable control with no risk of reversal and less vibration. In addition, authors have also considered a frequency separation filter of a shorter delay time so that current control performance will not lower even when high frequencies are introduced. This filter has achieved simplified compensation using repetitive characteristic through the utilization of the periodicity of high frequency current. Simulation and experiment have been conducted to verify that the stable performance of this system is improved.
Hybrid Sensor-less Control of Permanent Magnet Synchronous Motor in Low-speed Region
Yasuhiro Yamamoto,Hirohito Funato,Satoshi Ogasawara 전력전자학회 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.4
This paper proposes a method of improving the stability in sensor-less control of permanent magnet synchronous motors. The control method for low-speed region is divided into two: One is a high frequency method, which involves a problem of reverse rotation once misdetection of the permanent magnet polarity should occur, and another one is a current drive method, which has a problem that phase and speed oscillations are caused by quick speed changes. Hence, authors propose adoption of the current drive method for the basic control system with added compensation of stabilization by means of the high frequency method. This combination secures stable control with no risk of reversal and less vibration. In addition, authors have also considered a frequency separation filter of a shorter delay time so that current control performance will not lower even when high frequencies are introduced. This filter has achieved simplified compensation using repetitive characteristic through the utilization of the periodicity of high frequency current. Simulation and experiment have been conducted to verify that the stable performance of this system is improved.