Tamdem vs monoblock

New icebreaker for the NERC

Rolls-Royce has ordered two tandem motors of 2 x 2750KW each for polar oceanographic icebreaker research vessels. This hull will be one operation unit to be added to the current fleet of the NERC (Natural Environment Research Council), that will be built at Cammel Laird Shipyard (UK).

The vessel has very strict low noise requirements to be met, and due to this, Alconza’s motors will be in full compliance with these restrictions, with the remark that there will be rigidly mounted and directly coupled to the propeller.

In comparison with a single 5500KW motor, a tandem solution (2 x 2750KW) offers a redundancy in case of failure on one motor (50% of the power will be in use), a more optimized body dimensions, the chance to operate with two independent frequency converter feeding and the possibility of interchangeability of sleeve bearings if required.

Parallel to this solution, Alconza has delivered monoblock motors. If the tandem is defined as two motors on a common bed plate with an intermediate coupling between the two motors, the difference with the monoblock is that this one has a common bed plate and shaft, with no intermediate coupling.

Dig into the NERC page to see more detailed information of the project:

NERC new polar research vessel: Consultation on science requirements

New polar research ship for UK

Hydropower generators for the second phase of Renace Power Station

 Renace II

The fourth phase of this project will see the conversion of the private electricity generator Renace into the largest hydroelectric power station in Guatemala, with a total installed capacity of 306MW on completion of the project.

Alconza has participated in the second phase of this project, contributing to an improvement in the supply of electricity to the inhabitants of the San Pedro de Carchá municipality (Alta Verapaz), through the exploitation of the Cahabón river.

Alconza's technical team has just finalised the implementation of 4 generators of 33.76MVA power at 450rpm with 13.8KV. These generators have been designed and manufactured by the company, who are specialists in the design of hydroelectric applications. In this phase of the project, Alconza has developed a special design which boasts both low vibration levels and easy maintenance; this in turn, allows the dismantling of the axel when the turbine and machine group are both fully assembled.

Alconza seeks to reinforce its position in the hydropower market through this recent investment in the expansion of the production plant. This will allow the company to take on a greater range of machines.

More information about this: Complejo hidroelectrico Renace generara 306 megavatios

Rigidly mounted motor for Rolls-Royce


Alconza has just delivered to Rolls-Royce a motor for an oceanographic research vessel. This motor will be rigidly mounted, in strict compliance with noise and vibration limits settled by international standards. This motor, a 5000KW at 600rpm one, has been shipped to the shipyard Fincantieri (Italy) after having passed laboratory tests successfully.

Again, Alconza's technical team has achieved the challenge of making the levels of noise and vibrations of the machine without dampers in the assembly be below the established limits.


Renovation at Alconza


Alconza has expanded and renovated its production and testing facilities, following the continuous improvement of the quality standard and always adapting to the changes that dictate the markets where it operates.

Alconza has an extra new manufacturing warehouse of 3,600m2 with ...:

  • Gauge of 15m max.
  • Pit deck of 264 m² for balancing and testing.
  • New paint booth.

In parallel, Alconza has invested in machinery to improve production processes in plant cells, such as self-controlled robot, taping and reeling specific technology, among others.

Thus, not only it has managed to increase the range of machines (larger machines, up to 40MVA), but it has also increased the production capacity to shorten lead times and provide a better response to their customers resulting more competitive.

As the tests of machinery requires a better response to more demanding for approaching to real conditions, Alconza's laboratory has also gone through a number of implementations for its improvement of performance:

  • Improvement of the sound insulation at the machine room.
  • Implementation of new system of control and test data acquisition (SCADA).
  • Project for a better prediction and reduction of electromagnetic noise.
  • Modular installation of semi-anechoic chamber tests at the pit deck.

El Hierro island: supplied in a 100% by renewable sources


On 9/08/2015, Gorona del Viento hydro-wind power plant supplies with energy from clean sources to all the residents of El Hierro island.

Technically, the plant consists of a wind farm of 5 grid-connected wind turbines and an hydroelectric power station with 4 generators made by ALCONZA, capable of producing 35 GW/h of energy to supply the population. These generators (2,825MVA/unit) perform when the windmills do not produce enough energy and due to this the waterfall must be exploited.

The project is a world leader not only by the technological achievement record combining different natural energy sources, but also because it is the first time a project of such magnitude and dimensions has ever built.

For the next decade, it is expected that the implemented system will generate a saving of 80 million of Euros due to 6.000 tons per year of less burned diesel and 20.000 tons of CO2 less poured to the atmosphere.


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