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RISS 인기검색어
- 검색키워드
- 저자 : Nobukazu HOSHI (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Masashi Kajino,Nobukazu Hoshi,Meifen CAO 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper shows the considerations of the control characteristics when the surface permanent magnet synchronous motor installed in an electric vehicle is controlled by direct torque control or current control type vector control. Current control type vector control is generally used as a control method of permanent magnet synchronous motor; however, that requires a rotor position detector, the rotating coordinate transformation, and current controller, which needs the gain adjustment. As a result, the controller configuration becomes complicated. In contrast, direct torque control does not require rotor position detector and current controller on the rotating coordinate system. Thus, position sensorless control can be realized more easily. In this research, the controller, which includes a three-phase voltage source inverter and controller board, of an electric vehicle was replaced in order to enable change of the motor control scheme. In addition, simulation verification, comparison of transient characteristics between two control schemes, was conducted. As a simulation result, vehicle speed characteristics of two schemes were almost same. However, the torque and the current of DTC have large ripple than those of vector control. Moreover, some experimental results are shown in this paper.
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Comparison of FPGA-based Direct Torque Controllers for Permanent Magnet Synchronous Motors
Yoshiharu Utsumi,Nobukazu Hoshi,Kuniomi Oguchi 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper reports two types of direct torque controllers for permanent magnet synchronous motors (PMSMs) in which the hardware configuration differs. These controllers used a single-chip FPGA (Field Programmable Gate Array). One of the controllers was constructed by programming the soft-CPU and the hardware logics written in VHDL (Very high speed ic Hardware Description Language), another was constructed only by hardware.<br/> The characteristics of these two controllers were compared in this paper. As the result, the controller constructed only by the hardware was able to shorten the control period, and it was able to suppress the torque ripple low.
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Hiroshi HAYAMA,Nobukazu HOSHI 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Auxiliary resonant snubber inverters (RSIs) have been proposed as a solution of demands for inverter, which are high efficiency and low EMI. In RSI, zero voltage switching (ZVS) on the inverter main switches is achieved by use of the auxiliary circuit; however, additional conduction loss increases simultaneously. The operating frequency of the auxiliary circuit in RSI can be reduced to a half of switching transition of a main switch when lossless snubber commutation, in which ZVS can be achieved without using auxiliary circuit by using output current, is used. As a result, additional conduction loss can be suppressed. However, in this scheme, ZVS turn-on on main switch is failed near zero output current when dead-time was constant. As a solution for this problem, adjustable dead-time control scheme for RSI has been proposed. Adjustable dead-time control has not been applied to a rectifier with auxiliary resonant snubber circuit ?auxiliary resonant snubber rectifier (RSR)in the previous work. Thus, adjustable dead-time control is applied to RSR in this paper. This paper shows a control scheme for RSR. Moreover, the effectiveness of adjustable dead-time control by comparing between the adjustable and the fixed dead-time control is described.
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Comparison of FPGA-based Direct Torque Controllers for Permanent Magnet Synchronous Motors
Utsumi Yoshiharu,Hoshi Nobukazu,Oguchi Kuniomi The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.2
This paper compares two types of direct torque controllers for permanent magnet synchronous motors(PMSMs). These controllers both use a single-chip FPGA(Field Programmable Gate Array) but have differing hardware configurations. One of the controllers was constructed by programming a soft-core CPU and hardware logic circuits written in VHDL(Very high speed IC Hardware Description Language), while the other was constructed of only hardware logic circuits. The characteristics of these two controllers were compared in this paper. The results show the controller constructed of only hardware logic circuits was able to shorten the control period and it was able to suppress the low torque ripple.
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Comparison of FPGA-based Direct Torque Controllers for Permanent Magnet Synchronous Motors
Yoshiharu Utsumi,Nobukazu Hoshi,Kuniomi Oguchi 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.2
This paper compares two types of direct torque controllers for permanent magnet synchronous motors(PMSMs). These controllers both use a single-chip FPGA(Field Programmable Gate Array) but have differing hardware configurations. One of the controllers was constructed by programming a soft-core CPU and hardware logic circuits written in VHDL(Very high speed IC Hardware Description Language), while the other was constructed of only hardware logic circuits.<br/> The characteristics of these two controllers were compared in this paper. The results show the controller constructed of only hardware logic circuits was able to shorten the control period and it was able to suppress the low torque ripple.
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Hikari Nitta,Nobukazu Hoshi,Koki Ishizuka,Kazuhito Fukuda 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Hydrogen engine generator has attracted attention because it is cheaper than fuel cells and does not emit CO₂. However, hydrogen flow rate must be controlled appropriately according to output power, which changes depending on the load. If the hydrogen flow rate input into the engine was not controlled appropriately, the output voltage is dropped or the fuel efficiency becomes worse. In this paper, output voltage control of a hydrogen engine generator using a hill climbing method with an evaluation function simulating a quadratic function is proposed. It is clarified by experiments that the output voltage of the generator can be controlled to a constant value by applying the hill climbing method with the evaluation function even when the load fluctuates. In addition, it is shown that the response time can be shortened by 0.4 sec with the same system configuration as the previously proposed PI controlled system.
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