| Satoru Inarida | Rolling Stock Development Center, Mito Transportation Systems Product Div., |
| Tetsuo Kojima | Rolling Stock Development Center, Mito Transportation Systems Product Div., |
| Motomi Shimada | Rolling Stock Development Center, Mito Transportation Systems Product Div., |
| Seikichi Masuda | Generator Systems Dept., Power & Industrial Systems Div., Power & Industrial Systems, |
Hitachi, Ltd. has been developing vector-control techniques, high-voltage insulated gate bipolar transistors (IGBTs), snubberless inverters, soft-gate circuits which can control switching behavior of IGBTs, airless line breakers, and electronic master controllers to make train traction systems smaller, lighter, more functional, and easier to maintain. Recently, however, the need for upgrading train traction systems has been growing due to changes in social conditions such as heightened environmental consciousness. In particular, train traction systems need to be even easier to maintain, more energy efficient, smaller and lighter (through simplification of cooling equipment by reducing refrigerant and blowers), and more functional (improved passenger comfort). To meet these new needs, Hitachi has developed (1) high-conductivity, high-voltage power devices to make cooling equipment smaller and lighter, (2) snubberless inverters using high-voltage power devices to reduce the number of components, (3) control systems to achieve advanced rolling-stock control and high functionality, (4) train power control using on-board data-transmission equipment, and (5) low-maintenance motors. Hitachi is enhancing these technologies to provide a train traction system that is smaller and lighter and easier to maintain while improving passenger comfort.
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Mito Transportation Systems Product Div. (Japanese Only) |
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HITACHI Rail Systems |
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The Hitachi Hyoron (Japanese Only) |
train traction system, power supply converter, IGBT, on-board LAN
