On October 22, 2019 Anonymous commented:
Permanent Magnet Synchronous Motor (PMSM) technology is applied to propulsion motors to reduce the power of propulsion [1, 2].
Anonymous and Pete
Permanent Magnet Synchronous Motor (PMSM) technology is applied to propulsion motors to reduce the power of propulsion [1, 2].
Jeumont Electric and Siemens both manufacture PMSM, i.e., MAGTRONIC and PERMASYN, respectively. The structures of MAGTRONIC and PERMAYN are completely different. While MAGTRONIC presumably consists of two armatures [3], PERMASYN currently has one armature.
From the viewpoint of redundancy, PMSM with two armatures or a tandem combination of PMSM [4] with one armature is desirable.
[Pete added further details about Permanent Magnet Motors [5]. Note that it was announced today that Jeumont Electric had won a major contract to install the electrics of Australia’s future Attack-class submarines [6]. Jeumont will almost certainly supply PMSMs for the Attack-class [7].]
[2] According to Toshiba, PMSM reduced power consumption by 50% . In Anonymous calculations by using the data of Victoria-class submarines (DC motor) and Soryu submarines (PMSM), nearly the same result was obtained.
[3] One armature is used at low speed range, and two armatures are used at middle and high speed ranges. Even if one armature has failed, another armature can be used.
[4] Siemens seems to be developing tandem PERMASYN.
[6] on October 23, 2019 Naval Group announced https://naval-group.com.au/2019/10/23/subcontract-awarded-for-future-submarine-main-electric-propulsion-equipment/“Subcontract Awarded For Future Submarine Main Electric Propulsion Equipment” “Naval Group has signed a subcontract with Jeumont Electric (France) for the design of the Main Electric Propulsion Equipment for the Attack Class Submarines. The Main Electric Propulsion Equipment converts electrical power using Converter Cubicles into mechanical power and then propels the Submarine through the water...”
[7] "November 7, 2019 Jeumont Electric is...also the preferred supplier of new generation permanent magnet motors for the Australian Future Submarine Program." https://www.asc.com.au/news-media/latest-news/asc-enters-into-long-term-collaboration-with-jeumont-electric-of-france/
Anonymous and Pete