The Experts below are selected from a list of 41079 Experts worldwide ranked by ideXlab platform
Takashi Kosaka - One of the best experts on this subject based on the ideXlab platform.
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hybrid excitation flux switching motor with permanent magnet placed at middle of Field Coil slots and high filling factor windings
CES Transactions on Electrical Machines and Systems, 2019Co-Authors: Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki MatsuiAbstract:Design and experimental studies on a hybrid excitation flux switching motor as a traction motor for hybrid electric vehicles drive are presented. A stator body of the motor consists of not only laminated silicon-iron electromagnetic steel and three-phase armature windings, but also both of Field excitation Coils and permanent magnets working together as a variable Field magnetomotive force source. On the other hand, a rotor is composed of just laminated silicon-iron electromagnetic steel with salient poles like switched reluctance motor. To bring out the best in drive performances of the hybrid excitation flux switching motor as a variable flux motor for the application, each material adopted for the stator and rotor body should be designed properly in terms of motor efficiency, maximum torque and power densities and so forth. As some of them, in this paper, thinner silicon-iron electromagnetic steel sheet and permanent magnets with high remanent and low amount of Dysprosium used are applied for achieving higher motor efficiency. Moreover, all Coils wound flatwise and edgewise using rectangular wires are introduced to realizing high filling factor for reduced copper losses. Experimental tests using a 60kW prototype of the motor demonstrates the designed motor has good motor efficiency under frequent operating points expected for the target vehicle drive.
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hybrid excitation flux switching motor with permanent magnet placed at middle of Field Coil slots employing high filling factor windings
European Conference on Cognitive Ergonomics, 2018Co-Authors: Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki MatsuiAbstract:Design and experimental studies on Hybrid Excitation Flux Switching Motor (HEFSM) applied to a traction motor for hybrid electric vehicles are presented. A stator body of HEFSM generally consists of not only laminated core and three-phase armature Coils, but also Field excitation Coils and permanent magnets as Field mmf sources. Therefore, each material used in the stator body should be designed properly with the purpose of performance improvements such as efficiency, power and torque densities, cost and so forth. The configuration and the arrangement of all Coils are examined to increase their filling factor for reducing copper losses. Moreover, thinner electromagnetic steel and permanent magnets with high remanent flux density are employed to achieve higher efficiency. Experimental tests using a prototype of HEFSM validate the design results.
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design studies on hybrid excitation motor for main spindle drive in machine tools
IEEE Transactions on Industrial Electronics, 2010Co-Authors: Takashi Kosaka, Muthubabu Sridharbabu, Masayoshi Yamamoto, N MatsuiAbstract:This paper presents a hybrid excitation motor for a main spindle drive in end- and face-milling tools, which is operated with a high speed of 50 000 r/min. The proposed motor has not only a permanent magnet but also the Field Coil which makes Field-weakening and Field-strengthening controls possible with taking no notice of the permanent magnet demagnetization. In addition, the sum of iron and copper losses of the motor at the end-milling operation is significantly reduced by the Field-weakening control. The 3-D finite-element-method-based design studies on the proposed motor for the target application are demonstrated.
Nobuyuki Matsui - One of the best experts on this subject based on the ideXlab platform.
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hybrid excitation flux switching motor with permanent magnet placed at middle of Field Coil slots and high filling factor windings
CES Transactions on Electrical Machines and Systems, 2019Co-Authors: Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki MatsuiAbstract:Design and experimental studies on a hybrid excitation flux switching motor as a traction motor for hybrid electric vehicles drive are presented. A stator body of the motor consists of not only laminated silicon-iron electromagnetic steel and three-phase armature windings, but also both of Field excitation Coils and permanent magnets working together as a variable Field magnetomotive force source. On the other hand, a rotor is composed of just laminated silicon-iron electromagnetic steel with salient poles like switched reluctance motor. To bring out the best in drive performances of the hybrid excitation flux switching motor as a variable flux motor for the application, each material adopted for the stator and rotor body should be designed properly in terms of motor efficiency, maximum torque and power densities and so forth. As some of them, in this paper, thinner silicon-iron electromagnetic steel sheet and permanent magnets with high remanent and low amount of Dysprosium used are applied for achieving higher motor efficiency. Moreover, all Coils wound flatwise and edgewise using rectangular wires are introduced to realizing high filling factor for reduced copper losses. Experimental tests using a 60kW prototype of the motor demonstrates the designed motor has good motor efficiency under frequent operating points expected for the target vehicle drive.
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hybrid excitation flux switching motor with permanent magnet placed at middle of Field Coil slots employing high filling factor windings
European Conference on Cognitive Ergonomics, 2018Co-Authors: Takeshi Okada, Takashi Kosaka, Hiroaki Matsumori, Nobuyuki MatsuiAbstract:Design and experimental studies on Hybrid Excitation Flux Switching Motor (HEFSM) applied to a traction motor for hybrid electric vehicles are presented. A stator body of HEFSM generally consists of not only laminated core and three-phase armature Coils, but also Field excitation Coils and permanent magnets as Field mmf sources. Therefore, each material used in the stator body should be designed properly with the purpose of performance improvements such as efficiency, power and torque densities, cost and so forth. The configuration and the arrangement of all Coils are examined to increase their filling factor for reducing copper losses. Moreover, thinner electromagnetic steel and permanent magnets with high remanent flux density are employed to achieve higher efficiency. Experimental tests using a prototype of HEFSM validate the design results.
Sunghun Lim - One of the best experts on this subject based on the ideXlab platform.
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fault current waveform analysis of a flux lock type sfcl according to lc resonance condition of third winding
Journal of Electrical Engineering & Technology, 2008Co-Authors: Sunghun LimAbstract:The flux-lock type superconducting fault current limiter (SFCL) can apply the magnetic Field into the high-T c superconducting (HTSC) element by adopting the magnetic Field Coil in its third winding. To apply the magnetic Field into the HTSC element effectively, the capacitor for LC resonance is connected in series with the magnetic Field Coil. However, the current waveform of third winding for the application of the magnetic Field is affected by the LC resonance condition for the frequency of the source voltage and can affect the waveform of the limited fault current. In this paper, the current waveform of the third winding in the flux-lock type SFCL according to LC resonance condition during a fault period was analyzed. From the differential equation for its electrical circuit, the current equation of the third winding was derived and described with the natural frequency and the damping ratio as design parameters. Through the analysis according to the design parameters of the third winding, the waveform of the limited fault current was confirmed to be influenced by the current waveform of the third winding and the design condition for the stable fault current limiting operation of this SFCL was obtained.
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the fault current limiting characteristics of a flux lock type high tc superconducting fault current limiter using series resonance
Cryogenics, 2004Co-Authors: Sunghun Lim, Hyosang Choi, Byoungsung HanAbstract:Abstract We analyzed the fault current limiting characteristics of a flux-lock type high- T c superconducting fault current limiter (HTSC-FCL) using series resonance between capacitor for series resonance and magnetic Field Coil which was installed in Coil 3. The capacitor for the series resonance in the flux-lock type HTSC-FCL was inserted in series with the magnetic Field Coil to apply enough magnetic Field into HTSC element, which resulted in higher resistance of HTSC element. However, the impedance of the flux-lock type HTSC-FCL has started to decrease since the current of Coil 3 exceeded one of Coil 2 after a fault accident. The decrease in the impedance of the FCL causes the line current to increase and, if continues, the capacitor for the series resonance to be destructed. To avoid this operation, the flux-lock type HTSC-FCL requires an additional device such as fault current interrupter or control circuit for magnetic Field. This paper investigated the parameter range where the operation as mentioned above for the designed flux-lock type HTSC-FCL using series resonance occurred from the experimental results. In the design of the flux-lock type HTSC-FCL, the some methods to avoid the continuous increase of the line current were suggested and confirmed by the experiments that the suggested methods were available to prevent the continuous increase of the line current after a fault happened.
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current limiting characteristics of flux lock type high t sub c superconducting fault current limiter with control circuit for magnetic Field
IEEE Transactions on Applied Superconductivity, 2003Co-Authors: Sunghun Lim, Hyosang Choi, Hyeonggon Kang, Seongryong Lee, Byoungsung HanAbstract:A flux-lock type superconducting fault current limiter (SFCL) can change the amplitude of the magnetic Field by adjusting either the inserting resistance or the phase adjusting capacitor. However, the magnetic Field Coil cannot generate enough magnetic Field for some time after a fault happens due to resonance between the phase adjusting capacitor and the magnetic Field Coil. It is also required for the magnetic Field generated to be controlled for the application to high-T/sub C/ superconducting (HTSC) elements which have different critical characteristics. This paper proposes a flux-lock type SFCL with a control circuit for the magnetic Field, which is composed of solid state switches connected with the magnetic Field Coil. A current limiting experiment of this model was carried out. We showed that the amplitude of the fault current as well as the magnetic Field could be controlled by the sinusoidal pulse width modulation (SPWM) operation, one of the switching techniques for controlling the magnetic Field.
Hyosang Choi - One of the best experts on this subject based on the ideXlab platform.
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operational characteristics of a flux lock type high t sub c superconducting fault current limiter with a tap changer
IEEE Transactions on Applied Superconductivity, 2004Co-Authors: Hyosang ChoiAbstract:The authors investigate the operational characteristics of a flux-lock-type high-T/sub c/ superconducting (HTSC) fault current limiter (SFCL) with a tap changer which could adjust the number of turns of the third winding. In the case of conventional flux-lock-type SFCL, the phase adjusting capacitor is connected in series with magnetic Field Coil to adjust the magnetic Field applied to the HTSC element in phase with the current flowing through the HTSC element during a fault time. However, the current flowing at the third winding, which is connected with magnetic Field Coil, affects the fault current limiting characteristics. To analyze the influence of current flowing at the third winding on the fault current limiting characteristics, the fault current limiting characteristics of the flux-lock type SFCL, whose inductance of Coil 3 could be adjustable through a tap changer, are investigated through the experiments and the computer-aided simulations. The relation of line currents flowing into the flux-lock-type SFCL during a fault time and numbers of turns of a tap changer is drawn.
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the fault current limiting characteristics of a flux lock type high tc superconducting fault current limiter using series resonance
Cryogenics, 2004Co-Authors: Sunghun Lim, Hyosang Choi, Byoungsung HanAbstract:Abstract We analyzed the fault current limiting characteristics of a flux-lock type high- T c superconducting fault current limiter (HTSC-FCL) using series resonance between capacitor for series resonance and magnetic Field Coil which was installed in Coil 3. The capacitor for the series resonance in the flux-lock type HTSC-FCL was inserted in series with the magnetic Field Coil to apply enough magnetic Field into HTSC element, which resulted in higher resistance of HTSC element. However, the impedance of the flux-lock type HTSC-FCL has started to decrease since the current of Coil 3 exceeded one of Coil 2 after a fault accident. The decrease in the impedance of the FCL causes the line current to increase and, if continues, the capacitor for the series resonance to be destructed. To avoid this operation, the flux-lock type HTSC-FCL requires an additional device such as fault current interrupter or control circuit for magnetic Field. This paper investigated the parameter range where the operation as mentioned above for the designed flux-lock type HTSC-FCL using series resonance occurred from the experimental results. In the design of the flux-lock type HTSC-FCL, the some methods to avoid the continuous increase of the line current were suggested and confirmed by the experiments that the suggested methods were available to prevent the continuous increase of the line current after a fault happened.
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current limiting characteristics of flux lock type high t sub c superconducting fault current limiter with control circuit for magnetic Field
IEEE Transactions on Applied Superconductivity, 2003Co-Authors: Sunghun Lim, Hyosang Choi, Hyeonggon Kang, Seongryong Lee, Byoungsung HanAbstract:A flux-lock type superconducting fault current limiter (SFCL) can change the amplitude of the magnetic Field by adjusting either the inserting resistance or the phase adjusting capacitor. However, the magnetic Field Coil cannot generate enough magnetic Field for some time after a fault happens due to resonance between the phase adjusting capacitor and the magnetic Field Coil. It is also required for the magnetic Field generated to be controlled for the application to high-T/sub C/ superconducting (HTSC) elements which have different critical characteristics. This paper proposes a flux-lock type SFCL with a control circuit for the magnetic Field, which is composed of solid state switches connected with the magnetic Field Coil. A current limiting experiment of this model was carried out. We showed that the amplitude of the fault current as well as the magnetic Field could be controlled by the sinusoidal pulse width modulation (SPWM) operation, one of the switching techniques for controlling the magnetic Field.
Byoungsung Han - One of the best experts on this subject based on the ideXlab platform.
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the fault current limiting characteristics of a flux lock type high tc superconducting fault current limiter using series resonance
Cryogenics, 2004Co-Authors: Sunghun Lim, Hyosang Choi, Byoungsung HanAbstract:Abstract We analyzed the fault current limiting characteristics of a flux-lock type high- T c superconducting fault current limiter (HTSC-FCL) using series resonance between capacitor for series resonance and magnetic Field Coil which was installed in Coil 3. The capacitor for the series resonance in the flux-lock type HTSC-FCL was inserted in series with the magnetic Field Coil to apply enough magnetic Field into HTSC element, which resulted in higher resistance of HTSC element. However, the impedance of the flux-lock type HTSC-FCL has started to decrease since the current of Coil 3 exceeded one of Coil 2 after a fault accident. The decrease in the impedance of the FCL causes the line current to increase and, if continues, the capacitor for the series resonance to be destructed. To avoid this operation, the flux-lock type HTSC-FCL requires an additional device such as fault current interrupter or control circuit for magnetic Field. This paper investigated the parameter range where the operation as mentioned above for the designed flux-lock type HTSC-FCL using series resonance occurred from the experimental results. In the design of the flux-lock type HTSC-FCL, the some methods to avoid the continuous increase of the line current were suggested and confirmed by the experiments that the suggested methods were available to prevent the continuous increase of the line current after a fault happened.
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current limiting characteristics of flux lock type high t sub c superconducting fault current limiter with control circuit for magnetic Field
IEEE Transactions on Applied Superconductivity, 2003Co-Authors: Sunghun Lim, Hyosang Choi, Hyeonggon Kang, Seongryong Lee, Byoungsung HanAbstract:A flux-lock type superconducting fault current limiter (SFCL) can change the amplitude of the magnetic Field by adjusting either the inserting resistance or the phase adjusting capacitor. However, the magnetic Field Coil cannot generate enough magnetic Field for some time after a fault happens due to resonance between the phase adjusting capacitor and the magnetic Field Coil. It is also required for the magnetic Field generated to be controlled for the application to high-T/sub C/ superconducting (HTSC) elements which have different critical characteristics. This paper proposes a flux-lock type SFCL with a control circuit for the magnetic Field, which is composed of solid state switches connected with the magnetic Field Coil. A current limiting experiment of this model was carried out. We showed that the amplitude of the fault current as well as the magnetic Field could be controlled by the sinusoidal pulse width modulation (SPWM) operation, one of the switching techniques for controlling the magnetic Field.