Hamm is setting a milestone for the compaction industry with the creation of eight battery-electric tandem rollers.
The new machines complement the HD CompactLine series. Some models are equipped with oscillation drums, including the world’s first E-combination rollers with oscillation.
The rollers are compact, emission-free and particularly quietly.
The battery-electric machines include the HD 10e (1 metre drum, 2.5 tonne operating weight) and the HD 12e (1.2 metre drum width, 2.7 tonne operating weight). Both rollers boast the same compaction power as their combustion engine counterparts, but produce zero local emissions. The e-rollers are operated in almost the same way as the other models in the HD CompactLine series.
A 48V Li-ion battery with 23.4 kWh capacity provides the energy for driving, steering and compaction. Charging from zero to 100 per cent takes about four hours on 220V. The roller is designed to operate in ambient temperatures of up to 45 C, while the battery supplies enough energy for an average working day.
The vibration or oscillation unit is electric driven only via specially designed, compact synchronous motors. As a result, the efficiency rating more than doubles and the energy demand is reduced. The electric drive motor and steering motor power a hydraulic system.
All e-components require zero maintenance and offer high torque. The concept ensures the power is always available to deliver peak performance on demand. As well, a large portion of the braking energy is fed back into the system by means of regeneration.
HammTronic Control system
The HammTronic control system monitors and controls the components of the zero-emissions rollers. Combined with the electronic driving levers, this makes the machine extremely easy to control with precision. Speed ramping is also implemented to ensure smooth accelerating and braking maneuvers.
Hamm has fine-tuned every aspect of the e-rollers to preserve resources.
For example, the models feature an automatic electric motor stop as standard. This deactivates all functions when the machine is idling, thereby reserving battery power. When Eco mode is selected, the control limits the working speed. This also saves energy, as does the LED lighting, which is fitted as standard.
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The innovative steering control also helps to conserve energy: In the parking position, it uses no energy at all. The steering motor does not switch on until the electric driving lever is actuated. Then, the machine steers with sensitive responsiveness and an adaptive energy supply with no additional effort.
Four of the e-models feature oscillation drums, two of which are combination rollers. This is where the already quiet oscillation meets with the quiet e-drive. The result is quiet compaction machines that produce no emissions and cause few vibrations in the surrounding area. They are ideal for compacting in noise-sensitive and vibration-sensitive areas, such as near hospitals or historical buildings.
All electrical components in the e-rollers are maintenance-free. The extensive electrification reduces the oil volume by more than 70 per cent. Across the entire system, there are few wear parts that require grease or that could suffer from abrasion.
The operating hours registered are also lower than on the diesel-engine models, as the operating hour meter is not activated until the driving lever is moved
