KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Access type: UnknownSubject: search.filters.subject.Switched reluctance motor

Search Results

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    An improved asymmetric half-bridge converter for switched reluctance motor in low-speed operation with current regulated mode
    (2015-10-01)
    Woothipatanapan, Sakhon
    ;
    Chancharoensook, Phop
    ;
    Jangwanitlert, Anuwat
    This study presents a novel method for reducing the switching losses of an asymmetric half-bridge converter for a three-phase, 12/8 switched reluctance motor operated in low speed. In particular, this study aims to reduce the switching-off losses of chopping switches in the converter when operated in the current regulated mode (chopping mode). The proposed method uses the mixed parallel operation of IGBT (chopping switch) and MOSFET (auxiliary switch). MOSFET is precisely controlled to momentarily conduct prior to the turn-off interval of the IGBT. Consequently, the voltage across the switches is clamped to approximately zero, substantially decreasing the turn-off switching losses. The analytical expressions of power losses are extensively elaborated. Compared with the conventional asymmetric half-bridge converter, the modified converter can effectively minimize the switching losses. Therefore, the efficiency of the converter is eventually improved. Computer simulation and experimental results confirm the effectiveness of the proposed technique.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    An improved asymmetric half-bridge converter for switched reluctance motor in low-speed operation with current regulated mode
    (2015-01-01)
    Woothipatanapan, Sakhon
    ;
    Chancharoensook, Phop
    ;
    Jangwanitlert, Anuwat
    This study presents a novel method for reducing the switching losses of an asymmetric half-bridge converter for a three-phase, 12/8 switched reluctance motor operated in low speed. In particular, this study aims to reduce the switching-off losses of chopping switches in the converter when operated in the current regulated mode (chopping mode). The proposed method uses the mixed parallel operation of IGBT (chopping switch) and MOSFET (auxiliary switch). MOSFET is precisely controlled to momentarily conduct prior to the turn-off interval of the IGBT. Consequently, the voltage across the switches is clamped to approximately zero, substantially decreasing the turn-off switching losses. The analytical expressions of power losses are extensively elaborated. Compared with the conventional asymmetric half-bridge converter, the modified converter can effectively minimize the switching losses. Therefore, the efficiency of the converter is eventually improved. Computer simulation and experimental results confirm the effectiveness of the proposed technique.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Efficiency improvement of converter for switched reluctance motor drives by mixed parallel operation of IGBT and MOSFET
    (2010-12-01)
    Woothipatanapan, Sakhon
    ;
    Jangwanitlert, Anuwat
    ;
    Chancharoensook, Phop
    This paper presents a method to improve the efficiency of a standard asymmetric half-bridge converter for 3-phase, 12/8 switched reluctance motor (SRM) drives at low speed operation. At that speed range, the converter operates mainly in current chopping modes. The proposed method employs mixed parallel operation of IGBT/MOSFET pairs. The technique is aiming for minimizing the turn-off switching losses of IGBT which are the main chopping switches. MOSFET are placed in parallel with each IGBT in order to momentarily conduct the phase current during IGBT's turn-off intervals. While the MOSFET is on, the voltage across the IGBT is close to zero resulting in substantially decreased turn-off loss. Those fast switching MOSFET later instantaneously turn-off the current with almost lossless. The algorithm is verified by computer simulation and experimental results. The results have satisfactorily shown validity of the proposed concept. Furthermore, performance of the proposed strategy is superior to those of the typical hard switching technique and the conventional soft switching scheme using optimum sized snubber capacitors. ©2010 IEEE.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Efficiency improvement of converter for switched reluctance motor drives at low speed operation
    (2009-12-01)
    Woothipatanapan, S.
    ;
    Chancharoensook, P.
    ;
    Jangwanitlert, A.
    This paper presents a method to improve the efficiency of a standard asymmetric half-bridge converter for 3 phase, 12/8 switched reluctance motor (SRM) drives at low speed operation. At that speed range, the SRM converter operates mainly in current chopping modes either hard chopping or soft chopping control. This work emphasizes on minimizing the main power losses during the turn-off interval of each cycle. Once the optimum size of snubber capacitor is obtained from calculation, such snubber capacitors are paralleled with chopping switches in order to reduce rate of voltage rise across those switches and ultimately their switching losses can be decreased. The developed dynamic model based on measured data of flux linkage and static torque characteristics of the SRM has been used for simulation in MATLAB/Simulink environment. The results have satisfactorily verified the validity of the proposed concept.