Toshiba Expands Its New Propulsi
The effects of energy-saving and the expansion of PMSMapplications grow as operators appreciate their ability to save energy
Formore eco-friendly railway systems The growing demand for energy worldwide and the associated increase in pollution, such as rising carbon
dioxide (CO2) emissions, is encouraging people to think of innovative solutions. Although railways are essentially eco-friendly, it is still necessary to reduce their impact on the environment and one way to do this is to develop energy-saving systems.
How we developed an efficient PMSM Toshiba has been developing Permanent Magnet Synchronous Motor (PMSM) for rail vehicles since the 1990s. A PMSM does not suffer from secondary copper loss since the rotor does not contain a copper bar or coil. By reducing the primary copper loss as well, the total loss from a traction motor with the same size can be cut by 50% compared with a conventional open-frame self-ventilated induction motor.
As a result, comparing the rated
efficiency of a 200kW traction motor, a PMSM propulsion system operates at about 97% efficiency compared with 91% for a conventional induction motor. Efficiency values are measured using the traction inverter drive.
Toshiba has developed a totally- enclosed PMSM, which makes it
DC 600V EMU motor
easier to maintain than a non-enclosed motor, and reduces noise emissions. In addition, the control devices have been made smaller and lighter thanks to developments in power electronics and control technology.
Toshiba has also developed a 4-in-1 traction inverter for
PMSM which uses an integrated power unit to drive four motors. This innovation has achieved a 60% volume reduction and a 50% reduction in mass compared with conventional traction inverters for PMSM. The 4-in-1 traction inverter uses a high-heat- resistant IGBT which has two circuits in one package. As it is almost the same size as the commonly-used traction inverter for induction motors, the PMSM system can easily replace equipment, such as traditional DC traction motor systems and induction motor systems on existing trains.
DC 1500V EMU motor
Energy-saving effects of PMSM Although the amount of energy saving depends on the load condition, operating pattern, and system improvements such as achieving better regenerative performance, it has been demonstrated in the field that energy consumption can be reduced by approximately 50% after replacing a conventional traction system with a PMSM propulsion system with improved
regenerative performance (see graph).
Expansion of PMSMapplications on urban railways In 2007, a PMSM propulsion system was
4-in-1 traction inverter for PMSM
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