ABB launches energy-efficient motor and inverter package for electric buses up to 12% fewer motor losses

The first 3-level inverter in the market for electric buses, the HES580 boasts superior energy efficiency and power output. Compared to conventional 2-level inverters, the HES580 achieves a substantial reduction of up to 75 percent in motor harmonic losses, significantly minimizing heat dissipation and maximizing energy conservation. The key to this superior performance lies in its innovative 3-level architecture. Unlike 2-level inverters, which switch between two voltage levels (DC+ and DC-), the HES580 introduces a third voltage step - the neutral.

This addition effectively halves the voltage step during each switching operation, resulting in reduced current ripple and subsequently lower harmonic losses. Consequently, the AMXE250 motor operates with enhanced efficiency, delivering greater performance across diverse driving conditions. The motor and inverter were developed together, meaning that they work optimally with one another. The new package, featuring the first 3-level inverter for buses, enables greater lifespan and significant efficiency gains with up to 12% less motor losses on typical drive cycles compared to previous 2-level inverters. The motor also offers high torque density for improved dynamic performance, as well as a quieter operation for increased passenger comfort.

Moreover, the HES580 not only demonstrates up to 12% fewer motor losses on typical drive cycles compared to conventional 2-level inverters but also significantly benefits the AMXE250 motor by extending its lifespan and enhancing its reliability. By mitigating harmonic effects and minimizing stress on motor windings, this advanced technology offers sustained performance and longevity of the entire electric drivetrain.

Additionally, the AMXE250 stands out as a compact, permanent magnet synchronous motor designed for high-efficiency propulsion. The motor also offers high torque density for improved dynamic performance, as well as a quieter operation for increased passenger comfort. The HES580 and AMXE250 have been designed to offer flexibility, allowing them to be placed further away from each other, thus providing operators with the possibility to further optimize space. With its easy parameter setting, commissioning, and start-up capabilities, the package can be swiftly installed into a vehicle.

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