PMSM — permanent-magnet synchronous traction motor, 205–400 kW

Description

Traction permanent-magnet synchronous motors (PMSM) are the newest direction in the traction machine range; the company developed them in 2018, continuing development from DC traction motors (1911) and asynchronous traction motors. Compared with asynchronous machines with a copper rotor winding, PMSM provides higher efficiency of about 98%, smaller dimensions, reduced noise and full torque at low speeds, which reduces energy consumption and life-cycle cost. Two basic designs are produced, and the suitability table evaluates each separately for metro, suburban, inter-regional and high-speed trains, which simplifies the choice for a given type of rolling stock. The open motor with self-ventilation, 400 kW, has dimensions 705.5 × 512 mm (length × diameter) and a mass of 432 kg; it is optimal for inter-regional and high-speed trains, is acceptable for metro and suburban services, and can be equipped with a lightweight design and a filterless cooling system. The totally enclosed motor with self-ventilation, 205 kW (517.5 × 540 mm, 590 kg), is recommended for metro and suburban trains; it is equipped with a bearing replacement system without removing the rotor, which reduces the time of this operation by 70%, and the enclosed design reduces noise by about 20% relative to the open design and extends the overhaul interval. This motor is used on Tokyo Metro 17000 series trains (since 2021, more than 15 sets and more than 240 motors, maximum speed 110 km/h). The design of each motor is adapted to the characteristics of a specific train using the finite element method; the motors can be equipped with sensors for IoT systems and condition-based maintenance. Production takes place at the plant in Japan, certified to EN 15085-2, ISO 9001 and ISO 14001.

Technical specifications