- 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
ABB announced the launch of an innovative new package, consisting of AMXE250 motor and HES580 inverter, tailored for electric buses. The new propulsion package, designed to work in harmony for a more efficient, reliable, and readily available solution for the industry, marks a significant leap forward in cleaner, more sustainable transportation options.
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.
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.
Compared to conventional 2-level inverters, the HES580 achieves a substantial reduction of up to 75 percent in motor harmonic losses 
The AMXE250 offers high torque density for improved dynamic performance
David Segbers, Global Product Manager at ABB’s Traction Division said, “We’re delighted to bring the first 3-level inverter for electric buses to the market. The motor-inverter package has been designed to work in perfect harmony and will bring significant energy efficiency gains for operators and OEMs alike.”
Global Head of Mobile e-Power at ABB, Fabiana Cavalcante said “Electrifying buses in this way is a key part of bringing sustainable, clean public transport that improves the quality of life. We’re thrilled to provide future-proof solutions that helps the industry to meet their sustainability and performance objectives.”
ABB Motion, a global leader in motors and drives, is at the core of accelerating a more productive and sustainable future. We innovate and push the boundaries of technology to contribute to energy efficient, decarbonizing and circular solutions for customers, industries and societies. With our digitally enabled drives, motors and services we support our customers and partners to achieve better performance, safety and reliability. We deliver motor driven solutions for a wide range of applications in all industrial segments. Building on over 140 years of domain expertise in electric powertrains, our more than 22,000 employees across 100 countries learn and improve every day. go.abb/motion
