Hamm will introduce eight electric tandem rollers from the HD CompactLine series. A Li-ion battery with a capacity of approximately 23 kWh supplies the components via a 48 V on-board power supply.
The maintenance-free battery can last for an entire working day, said Hamm. “When operating the electric tandem rollers, there are no differences with the diesel-powered models, and even the compaction power is identical.”
The energy released from the drive engines and vibration motors when braking is used via recuperation. To charge the permanently installed battery, plugs for 230 V and 400 V mains power are included on-board.
Electric combination roller with oscillation
The electric drive drastically reduces the noise emissions since there is no longer any noise from the engine. This makes the electric tandem rollers ideal for all areas in which users want to compact with as little noise as possible.
In such environments, since a low load with vibrations is often required, Hamm is presenting electric vibration and oscillation rollers, as well as an electric combination roller with oscillation. The company said it is the only manufacturer in the world to offer a tandem roller that works quietly, with low vibrations and free from emissions.
According to Hamm, most of its rollers on the market today can be operated with non-fossil fuels. These include biodiesel, i.e. diesel fuel that is derived from plants, as well as HVO (hydrotreated vegetable oil). They can be mixed with the diesel fuel or can replace it entirely. This also includes biodegradable hydraulic oils for the standard product range.
Eco Mode and hybrid solutions
Over the years, Hamm has been developing fuel-efficient machine technology in order to achieve an efficient and, in turn, resource-conserving workflow on the construction site.
For example, in all current series, the power train has been continuously optimised and designed for operation at reduced speeds, resulting in high fuel efficiency. The automatic engine stop also reduces consumption; it automatically switches off the engine after a few minutes of downtime, while taking into consideration the requirements for the exhaust gas cleaning systems. The Eco mode, which is integrated into all series, helps the driver to compact in a way that they can easily save fuel.
Furthermore, back in 2016, Hamm was already the first manufacturer in the world to combine a diesel engine with a hydraulic accumulator for the development of alternative drives. With this Power Hybrid roller from the HD+ series, it was possible to reduce the fuel expenditure by approximately 15% – all without having to compromise on compaction power. This was also coupled with a reduction in noise emissions.
Bauma booth: FS.1011