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Electrification of construction machinery
Electrical vibratory hammers have been an integral part of the MÜLLER vibration technology product range since the 1960s. At that time, the electric motors mounted on the vibratory hammers were still powered by diesel-driven generators. Mobile hydraulics were not yet widely available, which is why electrical motors were the preferred drive solution.
The three-phase asynchronous motors used were robust and easy to handle, but also heavy and not very powerful – characteristics that still apply today (compared to mobile hydraulic components).
With the advent of mobile hydraulics in the late 1970s and early 1980s, drive technology changed. Hydraulic motors and pumps impressed with their high power density, i.e., high output at a compact installation space. Diesel remained the preferred energy source: diesel engines were now used to operate pumps, which in turn supplied the hydraulic motors on the vibratory hammer – a departure from the diesel generators that had previously powered the electric motors.
Our solution at MÜLLER: zero emissions at half the price
The current situation has changed significantly: modern electrical motors, such as permanent magnet synchronous motors (PMSM), offer significantly better output than the electrical engines of the 1960s. At the same time, the need to reduce CO₂ emissions requires a move away from conventional diesel as an energy source.
Our solution addresses three key aspects:
- We are retaining the established hydraulic system with its high energy density. This means that we will not only continue to operate all vibratory hammers on the market, but now also emission-free ones.
- When using electrical components, we rely on the latest technologies, such as PMSM motors, which offer maximum output in a compact installation space.
- We offer a completely emission-free electrical-hydraulic drive unit (at use of 100% electricity from renewable energies). This can be powered by battery or, if possible at the construction site, by direct connection to the existing construction site power supply. The battery has sufficient capacity to ensure operation for an entire working day. At the end of the day, only the power pack needs to be replaced, which is a huge advantage. This means 100% emission savings and 50% investment savings at a new vibratory hammer.
Our four modular power packs, including modular battery storage systems, can be operated completely independently, respectively connected to the power grid in parallel to extend the service life or reduce the battery size. This allows vibratory hammers up to the size of an MS-28 HFV (medium-sized) to be operated:
• MS-A 170 E
170 kW hydraulic output -> approx. 290 l/min. oil flow rate
• MS-A 240 E
240 kW hydraulic output -> approx. 410 l/min. oil flow rate
• MS-A 315 E
315 kW hydraulic output -> approx. 540 l/min. oil flow rate
• MS-A 410 E
410 kW hydraulic power -> approx. 700 l/min. oil flow rate
Our self-sufficient power packs offer the possibility of optimally utilizing the range of the batteries through innovative solutions on large construction sites or at longer operations. Construction machines can be designed to operate efficiently even under these conditions, with operational continuity ensured through the use of mobile charging units or regular battery changes. In addition, the battery storage units can be fully recharged overnight using a standard construction site power distributor (63A).
RTG Hybrid
With our products from the RTG piling technology division of the internationally active Bauer Maschinen Group, we are your specialist for energy-efficient vibration, piling, and pressing technology. Our RTG telescopic and rigid piling rigs are designed to transmit high tensile and compressive forces and to absorb torques. Together with their high installed motor capacities, they are ideally suited as carrier devices for a wide range of applications, e.g., excavation pits, pile foundations and piling, bridge and harbour engineering, and urban construction sites with emission restrictions.
To drive the decarbonization process forward in a targeted manner, you will find the eRG19 hybrid telescopic guide in our product range. The hybrid drive combines two different drive types: the diesel engine for maximum output when high force is required, and the electric motor for emission-reduced and noise-reduced operation, ideal for use in environmental protection areas or inner-city construction sites with strict noise protection and exhaust gas regulations. The advantages of this technology are compelling:
• Flexibility: Demand-oriented power control between electric and diesel engines – enabling use in areas without a direct power supply and in environmentally sensitive zones.
• Productivity: Increased thanks to improved efficiency
• Fuel efficiency: Fuel consumption reduced by up to 68% thanks to the supplementary electric drive.
• Emission reduction: Up to 45 kg/h reduction in CO₂ emissions – ideal for meeting sustainability targets.
• Optimized paralleles working of main and auxiliary consumers
• Noise reduction: Quieter operation at more sensitive projects – reduced sound power by up to 2 dB (A).
RG 19T Hybrid – actual construction site measurements
In addition to RTG's 430 kW diesel engine, the RG19 T hybrid power pack uses an 80 kW electrical engine that can be operated either independently or simultaneously.
• The diesel engine ensures that the installation can be used at any time, even without an additional power connection.
• The electric motor can be switched on when a power connection is available.
• The combined output of the two engines is 510 kW and represents a plug-in hybrid.
Modular hybrid line
