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7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo, 100-8310 Japan
Customer Inquiries
Media Inquiries
Railway Transportation
Public Utility Systems Group
Mitsubishi Electric Corporation
Public Relations Division
Mitsubishi Electric Corporation
[email protected]
Mitsubishi Electric’s Railcar Traction Inverter with All-SiC Power Modules
Achieves 40% Power Savings
Odakyu Railways’ 1000 series commuter train realizes dramatic cut in energy consumption
TOKYO, June 22, 2015 – Mitsubishi Electric Corporation (TOKYO: 6503) announced today its main
circuits featuring traction inverter made with all-silicon carbide (SiC), which were installed in a 1000 series
urban train operated by Odakyu Electric Railway Co., Ltd. in Japan, have been verified to achieve an
approximate 40-percent savings in power consumption compared to a train using conventional circuitry. The
traction inverter, which is rated for 1,500V DC catenaries, was tested over a four-month period.
The verification compared a car retrofitted with an all-SiC traction inverter and another car fitted with a
conventional gate turn-off thyristor traction inverter, both of which were put into actual commercial service.
The test measured power consumption and electric power regeneration ratio of the two cars’ main circuits,
which comprise traction inverters, high-efficiency main motors and filter reactors.
The following results are average values measured between January 17 and May 8, 2015:
- 17% power savings during powered operation
- Increase from 34.1% to 52.1% in power regeneration ratio, calculated as power from regenerative brakes
to catenaries divided by total electric power to drive the rail car
- 40% power savings overall
Specifications of Main Circuit
Input voltage:
1,500V DC
Main circuit system:
Large-capacity all-SiC power modules
Two-level PWM inverter with regenerative brakes
Control system:
Four traction motors with 190kW, parallel control
Cooling system:
Self cooling
Retrofitted Odakyu 1000 series train
Railcar traction inverter with all-SiC power modules
About Mitsubishi Electric Corporation
With over 90 years of experience in providing reliable, high-quality products, Mitsubishi Electric
Corporation (TOKYO: 6503) is a recognized world leader in the manufacture, marketing and sales of
electrical and electronic equipment used in information processing and communications, space development
and satellite communications, consumer electronics, industrial technology, energy, transportation and
building equipment. Embracing the spirit of its corporate statement, Changes for the Better, and its
environmental statement, Eco Changes, Mitsubishi Electric endeavors to be a global, leading green company,
enriching society with technology. The company recorded consolidated group sales of 4,323.0 billion yen
(US$ 36.0 billion*) in the fiscal year ended March 31, 2015. For more information visit:
*At an exchange rate of 120 yen to the US dollar, the rate given by the Tokyo Foreign Exchange Market on
March 31, 2015