By: Dr. Franyi Sarmiento, Ph.D., Inspenet, April 8, 2022.
ABB’s new online shaft generator will allow 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 vessels, including bulk carriers, container ships, LNG tankers, and passenger and car ferries.
The AMZ 1400 permanent magnet shaft generator is optimized for inverter 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 equipment package footprint 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 raised up to the ship for alignment.
Juha-Pekka Kivioja, ABB’s global product manager for large motors and generators, says: “ABB’s permanent magnet technology has proven 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 ships’ power systems meet the goals set by the International Maritime Organization (IMO) for the Energy Efficiency Index (EEDI), the efficiency index 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 Output (PTO) mode, it supplies the main power for the ship’s electrical network. This optimizes use of the larger engine, while reducing the need to run auxiliary generators, saving fuel and reducing emissions. In Power Acceptance (PTI) mode, the shaft generator acts as a synchronous motor to get an additional boost of power for propulsion. It can also provide a basic power take-off (PTH) for emergency propulsion in case the main engine fails.
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.
Source and photo : https://junkoagencia.cl/2022/03/31/nueva-tecnologia-de-generador-de-ejes-aumenta-la-eficiencia-energetica-en-el-mar/
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