著者

Kota Teramoto Kiyoshi Ohishi Takahiro Kondo Shingo Makishima Keiichi Uezono Shinobu Yasukawa

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.3, no.1, pp.75-85, 2014-01-01 (Released:2014-01-01)

参考文献数

25

被引用文献数

3 7

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Trains require high deceleration and stable traveling performance. Improvement in adhesion characteristics is, thus, very important for electric trains. We have previously proposed an anti-slip/skid re-adhesion control system that is based on a disturbance observer and possesses a high adhesion force utilization ratio. In the present work, we focus on the deceleration mode. Generally, a train has an electric regenerative brake (electric brake) and an air brake (mechanical brake). Under wet railway track conditions, the regenerative brake may be suspended because of the air brake response. This paper proposes a regenerative brake priority control and an electro-pneumatic blended braking control based on an estimated adhesion coefficient. Furthermore, this paper evaluates and discusses regenerative brake priority control using numerical simulations.

著者

Taisei Shinagawa Kiyoshi Ohishi Kodai Abe Yuki Yokokura

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.12, no.1, pp.45-53, 2023-01-01 (Released:2023-01-01)

参考文献数

16

被引用文献数

2

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In an electrolytic capacitor-less inverter, source current harmonics are caused by LC-circuit resonance, and the source power factor deteriorates. Therefore, an inverter must reduce harmonics control without additional circuits. This paper proposes a source current control method to reduce source current harmonics in a three-phase to three-phase electrolytic capacitor-less inverter of a permanent magnet synchronous motor drive. The proposed method consists of a source current control using the full-state feedbacks of a LC-resonance state observer. The validity of the proposed method is confirmed through experimental results.

著者

Yoshiaki Seki Kiyoshi Ohishi Yuki Yokokura Toshiki Sano Yuji Ide Daigo Kuraishi Akihiko Takahashi

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.6, no.2, pp.73-82, 2017-03-01 (Released:2017-03-01)

参考文献数

32

被引用文献数

1 5

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In the field of high precision positioning control, the position servo system must be highly robust against disturbance torque. A Permanent Magnet Synchronous Motor (PMSM) has various torque ripple components that degrade control performance. A portion of the torque ripple is caused by the harmonic current. The torque ripple can be suppressed using a highly robust current control system. The remaining torque ripple is defined as the disturbance torque and is compensated for using a Disturbance OBserver (DOB). However, it is very difficult for a DOB to perform the appropriate compensation because it uses a low-pass filter to reduce noise. To obtain highly robust performance, this paper proposes a new position servo system using a disturbance torque hybrid observer and a current control system in the α-β stationary frame. In addition, this paper uses the torque ripple equation instead of a torque ripple table so as to reduce the amount of Digital Signal Processor (DSP) memory. The effectiveness of the proposed position servo system is confirmed using numerical and experimental results.

著者

Yuto Kobayashi Kiyoshi Ohishi Yuki Yokokura Tenjiro Hiwatari Akira Satake

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.11, no.3, pp.494-505, 2022-05-01 (Released:2022-05-01)

参考文献数

19

被引用文献数

1

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This paper focuses on the voltage modulation method to reduce the switching frequency and proposes a voltage-integral-based reference tracking modulation (VIRTM) method. The proposed method calculates an evaluation function by considering the factors of the switching frequency. Thereafter, the proposed method outputs the voltage vector based on the evaluation function and reduces the switching frequency. The switching frequency of the conventional discontinuous pulse width modulation (DPWM) and that of the proposed VIRTM are evaluated by using simulations and experiments based on feed-forward and feedback control systems. From the results, the usefulness and effectiveness of the proposed method are confirmed.