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The EP20 (ЭП20) is a type of 6 axle Bo'Bo'Bo' electric passenger locomotive being built for Russian Railways by Transmashholding's Novocherkassk Electric Locomotive Plant. The locomotive was designed by Tekhnologii Relsovogo Transporta (TRTrans), a joint venture between Transmashholding and Alstom. An order for 200 locomotives was placed in 2010, and the first production unit formally presented in 2012. ==Design== The EP20 was developed by an Alstom-TMH joint venture "TRTrans", established in Novocherkassk, by French, Belgian, and Russia based engineers.〔〔〔(【引用サイトリンク】title=Alstom and Transmashholding sign a contract for the design and production of the EP20 electric locomotive for the Russian market )〕 One specification for the design was the ability to haul 24 coaches at 160 km/h or 17 vehicles at 200 km/h on straight level track.〔 The EP20 has a modular design. The locomotive body consisted of an underframe and sidewalls, with removable roof segments, and separately manufactured cab units. The driving cab modules were sourced from PKPP MDC (Ukraine); the cab design included a progressive deformation steel cage for impact absorption, and incorporated heating and air-conditioning. Access was via side doors in the main bodyshell, accessed via cab unit rear doors. PKPP MDC also supplied washrooms (2 per unit), incorporating a retention toilet system supplied by EVAC. The locomotive body had a central corridor connecting the end cabs, with equipment located on either side. The electrical system included four pantographs (2 for DC, 2 for AC). For AC drive a body mounted 9.3 MW transformer outputs 6 separate traction outputs at 1650 V, and a separate heating winding. The 1650V output is rectified to 3000 V DC; under 3 kV operation the input is connected directly through an intermediate diode four quadrant chopper. DC smoothing is via 8.550 MW rated inductances located under the locomotive. The DC link supplies six IGBT three phase inverters (grouped in three sets of two, one set per bogie), each driving a traction motor. The system allows individual axle control including anti-slip, as well as electrical dynamic braking. The traction motors are three phase asynchronous machines (DTA-1200 model, developed by NEVZ). They are suspended in the bogies and decoupled from the non-rotational motions of the driving wheels. The connection between motor and reduction gear is via a diaphram coupling, and the gearbox output drives a hollow shaft connected to the axle via a flexible coupling. The bogie suspension system consisted of coil primary suspension, and flexicoil secondary suspension with anti-hunting and anti-rocking dampers. Tractive forces from bogie to locomotive were transferred via traction rods connected to a low lying connection at the bogie pivot centre. Mechanical braking was by wheel mounted disc brakes. Electric braking is either up to 4.5MW rheostatic braking via roof mounted resistors, or up to 7.2MW regenerative braking. The locomotives are designed to operate in winter conditions down to , and incorporates underframe snowplows. The locomotive design was proposed as the base for a number of design variants: a single unit dual voltage freight variant ''E20'', and dual unit dual voltage freight variant ''2ES20'', as well as single voltage DC and AC machines. Additional variants with a design derived from the EP20 are freight and passenger 4 axle Bo'Bo' based machines. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「EP20」の詳細全文を読む スポンサード リンク
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