超小型VVVFインバーター装置が山手線で試験走行へ/Ultra-Compact VVVF Inverter Device to Undergo Trial Run on the Yamanote Line
2025年9月25日、JR東日本と三菱電機は鉄道車両の機能・品質向上やゼロカーボン化推進の一環として、次世代の超小型VVVFインバーター装置を山手線E235系1編成(トウ18編成)に試験搭載すると発表しました。今回の試験は2026年2月まで実施され、その成果は今後の鉄道車両設計や技術開発に活かされる予定です。
小型・軽量化と省エネ性能の革新
新開発の次世代VVVFインバーター装置は、省エネ性能の大幅な向上と圧倒的な小型・軽量化を実現しています。最新のSiC素子の採用や半導体チップ・パッケージ構造の最適化により、スイッチング損失を従来比で約60%削減。発熱の抑制により冷却器も小型化でき、装置全体の体積は約60%、質量は約50%も低減されました。
鉄道車両設計への影響と艤装性向上
この小型軽量技術により、車両への取り付けが容易になり、スライドレール方式による艤装作業の負担軽減や安全性向上が期待できます。また、搭載場所の自由度が増すことで、床下スペースの最適活用や柔軟な車両設計が可能となります。
交直流・交流電車単行運転の課題と新技術の役割
一般的に、交直流(AC/DC)や交流(AC)電車で単行(1両編成)運転が難しい主な理由は、高電圧交流用の変圧器や整流器といった大型・重量機器の搭載が必要になるためです。これらの機器は大きく重いため、車両の自重増加や製造コストの上昇、効率低下を招きます。そのため、これらの車両では機器を複数車両に分散して搭載する必要がある一方、単純な直流電車や気動車は機器構成が比較的シンプルで、小型編成や単行での運転が普及しています。今回の超小型VVVFインバーター装置の登場は、今後交流電車や交直流電車においても単行運転や小規模編成の実現可能性を高めるものと期待されます。
乗客サービスと車両品質の向上
床下スペースの余裕が生まれることで、新たなサービス機器や車両モニタリング装置の搭載が可能となり、乗客サービスや車両の安全・信頼性向上につながります。また、交流車両やハイブリッド、蓄電池車両など多様な駆動方式への応用も視野に入っています。
今後の展望
今回の試験搭載で得られる知見は、次世代鉄道車両の設計や開発、さらなる省エネ・省資源化の推進に貢献するものです。山手線でのデータ収集・検証を経て、日本の鉄道技術はより快適で効率的な未来へと進化していくことでしょう。
山手線のE235系に試験搭載するという次世代VVVFインバータ装置
— 猪苗代レイクタウン (@Koshigayakohan) September 25, 2025
1ヶ月以上前に撮影した画像です。このときにはもう工事を終えていた模様です。通電もしていたので、構内での試験を重ねていたのでしょうか。
既に何度か本線に出て試運転をした様子なので、営業運転も近いのかと気になります。 pic.twitter.com/fTvwMXZqvI
次世代VVVFインバータ、笑っちゃうぐらい小さい!
🚃次世代VVVFインバータ装置を試験搭載します🚃
\
JR東日本と三菱電機は、鉄道車両のさらなる機能・品質向上や省エネ化を目的として、次世代VVVFインバータ装置を山手線E235系1編成に試験的に搭載します🚃
試験搭載で得られる知見は、次世代車両の設計・開発に活用していきます🚃
詳細はこちら↓…
【フォーラム:山手線E235系1編成で次世代VVVFを試験搭載、来年2月まで 】
— 4号車の5号車寄り(東日本エリア) - 鉄道車両・施設動向をまとめるコミュニティサイト (@4gousya_east) September 25, 2025
JR東日本と三菱電機は25日、山手線E235系1編成に次世代VVVFインバータ装置2台を2026年2月まで試験的に搭載すると発表しました。
制御状態及びメンテナhttps://t.co/pfSHDtXqD6
|次世代VVVF E235系で試験¦車両|
— 山眺 (@2_VIEVV) September 25, 2025
┆次世代VVVFインバータ装置┆
・最新SiC素子→省エネ化→電力量軽減
・艤装性向上→フレキシブル化
・小型化・軽量化
→低減:体積60%、質量50%
・交流車両・HB車等にも応用可
┆試験車両┆E235系0番台(1本、2台)
┆試験時期┆〜2026/2https://t.co/j4OiiyBYMU pic.twitter.com/HUoiiKt75Z
今回の試験搭載で得られる知見は、次世代車両の設計・開発に活かす
— 山眺 (@2_VIEVV) September 25, 2025
…E237系へ採用されるのでしょうか? pic.twitter.com/UsaRgBPIuH
Ultra-Compact
VVVF Inverter Device to Undergo Trial Run on the Yamanote Line
On
September 25, 2025, JR East and Mitsubishi Electric announced that they would
install a next-generation ultra-compact VVVF inverter device on one E235 series
train of the Yamanote Line as part of efforts to enhance train functionality
and quality and promote zero-carbon initiatives. This trial will continue until
February 2026, and the results are expected to be utilized in future train
design and technology development.
Innovation
in Miniaturization, Weight Reduction, and Energy Efficiency
The
newly developed next-generation VVVF inverter device achieves significant
improvements in energy efficiency as well as outstanding miniaturization and
weight reduction. By adopting the latest SiC elements and optimizing the
structure of semiconductor chips and packages, switching losses have been
reduced by approximately 60% compared to conventional models. The suppression
of heat generation allows for smaller cooling systems, resulting in an overall
reduction of around 60% in volume and about 50% in weight for the device.
Impact
on Train Design and Improved Installability
Thanks
to its compact and lightweight design, the device can be more easily installed
on rolling stock. The use of a slide rail system is expected to reduce workload
during installation and improve safety. Additionally, increased flexibility in
mounting locations allows for more effective use of underfloor space and
enables flexible train design.
Challenges
of Single-Car Operation in AC/DC and AC Trains and the Role of New Technology
Generally,
single-car operation for AC/DC or AC trains is difficult because they require
large and heavy equipment like high-voltage AC transformers and rectifiers.
These devices increase the train's self-weight, manufacturing costs, and
decrease efficiency. As a result, such equipment is typically distributed
across multiple cars, while simpler DC electric trains and diesel railcars are
more commonly operated in small formations or as single cars. The introduction
of this ultra-compact VVVF inverter device is expected to increase the
feasibility of single-car or small-formation operation for AC and AC/DC trains
in the future.
Ultra-Compact
VVVF Inverter Device to Undergo Trial Run on the Yamanote Line
On
September 25, 2025, JR East and Mitsubishi Electric announced that they would
install a next-generation ultra-compact VVVF inverter device on one E235 series
train of the Yamanote Line as part of efforts to enhance train functionality
and quality and promote zero-carbon initiatives. This trial will continue until
February 2026, and the results are expected to be utilized in future train
design and technology development.
Innovation
in Miniaturization, Weight Reduction, and Energy Efficiency
The
newly developed next-generation VVVF inverter device achieves significant
improvements in energy efficiency as well as outstanding miniaturization and
weight reduction. By adopting the latest SiC elements and optimizing the
structure of semiconductor chips and packages, switching losses have been
reduced by approximately 60% compared to conventional models. The suppression
of heat generation allows for smaller cooling systems, resulting in an overall
reduction of around 60% in volume and about 50% in weight for the device.
Impact
on Train Design and Improved Installability
Thanks
to its compact and lightweight design, the device can be more easily installed
on rolling stock. The use of a slide rail system is expected to reduce workload
during installation and improve safety. Additionally, increased flexibility in
mounting locations allows for more effective use of underfloor space and
enables flexible train design.
Challenges
of Single-Car Operation in AC/DC and AC Trains and the Role of New Technology
Generally,
single-car operation for AC/DC or AC trains is difficult because they require
large and heavy equipment like high-voltage AC transformers and rectifiers.
These devices increase the train's self-weight, manufacturing costs, and
decrease efficiency. As a result, such equipment is typically distributed
across multiple cars, while simpler DC electric trains and diesel railcars are
more commonly operated in small formations or as single cars. The introduction
of this ultra-compact VVVF inverter device is expected to increase the
feasibility of single-car or small-formation operation for AC and AC/DC trains
in the future.
Additional
Note: For electric locomotives that operate as a single car, the onboard
equipment is usually packed onto the floor inside the vehicle. In past trial
operations of AC electric trains, it is likely that the necessary equipment was
installed inside the passenger compartment. As of 2025, there are still no AC
electric trains in Japan that operate as a single car.
Advancement
in Passenger Service and Vehicle Quality
With
the newly available underfloor space, it becomes possible to install new
service equipment or train monitoring devices, which will contribute to
improved passenger service and increased safety and reliability of the trains.
The technology is also envisioned for application in various traction systems
such as AC trains, hybrid trains, and battery-powered trains.
Future
Outlook
The
knowledge gained from this trial installation will contribute to the design and
development of next-generation railway vehicles and further promote energy and
resource conservation. Through data collection and validation on the Yamanote
Line, Japanese railway technology is expected to evolve towards a more
comfortable and efficient future.
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