Norwegian Cruise Line has selected Rolls-Royce to provide permanent magnet tunnel thrusters in order to upgrade the propulsion package onboard its cruise ship, Norwegian Epic.
Rolls-Royce permanent magnet tunnel thrusters will be capable of reducing noise and vibration along with an increase in power output of around 25% from the same size propeller.
Rolls-Royce America Marine Services senior vice-president Jay McFadyen said: "This highly innovative and cutting-edge permanent magnet technology is suitable for a range of applications in both merchant and offshore vessels, where exceptionally low noise levels, high-power output, and rapid response to power demand will benefit operators, crew and, very importantly, passengers alike.
"What we have seen so far through the experience of our first permanent magnet tunnel thruster in operation on the Rolls-Royce designed Olympic Octopus, a highly advanced offshore anchor-handling vessel, is that a permanent magnet motor thruster is quiet, efficient and durable."
The design of these thrusters includes a permanent magnet motor in a rim that drives the propeller in the centre and comprises two parts such as a stator that carries a number of electrical coil windings and a rotor fitted with a number of very strong permanent magnets.
Permanent magnet technology also provide space directly above the thrusters and the symmetrical design will offer equal thrust to port or starboard.
Last week, the Alaska Department of Transportation and Public Facilities selected Rolls-Royce to deliver a new efficient propulsion system for its future Alaska-class ferries.
Image: Norwegian Epic’s propulsion package will be upgraded with Rolls-Royce permanent magnet tunnel thrusters. Photo: courtesy of Rolls-Royce plc.