Advancing energy efficiency at sea with new shaft generator technology – Awdhesh







ABB’s innovative permanent magnet shaft generator design reduces fuel costs by up to 4 percent, improving the reliability of ocean-going vessels, while being up to 20 percent smaller and 30 percent lighter.

Santiago de Chile.- ABB’s latest online shaft generator will enable ship operators to benefit from the efficiency, performance and reliability of permanent magnet technology. The new generator improves flexibility and ease of installation for a wide variety of ships, including bulk carriers, container ships, liquefied natural gas tankers and ferries carrying passengers and cars.

The AMZ 1400 permanent magnet shaft generator is optimized for drive control and improves the efficiency of electrically excited or induction synchronous machines, both at full and part load. This helps reduce fuel costs by up to 4%, with a payback period of two to four years. It also significantly reduces CO2 emissions by several tons for every day of sailing.

Its compact size reduces the footprint of the equipment package by 20% compared to a conventional induction or synchronous type shaft generator. At the same time, the weight is 30% less. The unit is also easier to install in the shipyard, as the intermediate drive shaft is mounted to the generator and then lifted to the ship for alignment.

Juha-Pekka Kivioja, ABB Global Product Manager for Large Motors and Generators, says: “ABB’s permanent magnet technology has been proving its inherent reliability in large motors and generators for three decades, especially in offshore wind turbines and propulsion applications. Its use in shaft generators is an important step in helping ship power systems meet the targets set by the International Maritime Organization (IMO) for the Energy Efficiency Index (EEDI), the energy efficiency rating applicable to existing ships (EEXI) and the carbon intensity indicator (CII). Its potential to increase energy efficiency makes the permanent magnet shaft generator an important method of reducing emissions from larger ships.”

There are three possible modes of operation of the shaft generator in conjunction with the main propulsion engine. In Power Out (PTO) mode, it supplies the main power for the ship’s electrical grid. This optimizes the use of the larger engine, while reducing the need to run auxiliary generators, saving fuel and reducing emissions. In power acceptance mode (PTI), the shaft generator acts as a synchronous motor to obtain an additional power boost for propulsion. It can also provide basic power take-off (PTH) for emergency propulsion in the event of main engine failure.

The combination of the permanent magnet shaft generator with the converter can also power the thruster motors, allow connections between shore and ship, and connect other DC power sources or DC power consumers. In its first order, ABB will supply permanent magnet shaft generators for a fleet of twelve 210,000 dwt dual-fuel bulk carriers owned by Bermuda-based Himalaya Shipping.

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