British electrical drive specialist Helix builds among the most power-dense electrical motors on the planet. Now it is working to springboard that compact, power-packed design right into a marine drive ecosystem it believes will assist change the face (or at the least underbody) of on a regular basis leisure and utility boating. The corporate’s all-new Pod Cartridge brings the e-drive parts essential to make 360-degree pod drives a extensively out there answer able to rising effectivity and boosting maneuverability throughout an enormous market of vessels.
Developed from the azimuth thruster methods relationship again to the mid-Twentieth century and past, electrical pod drives function a versatile, decentralized type of marine propulsion that will increase effectivity, improves maneuverability and frees up house in a ship’s hull. As a substitute of counting on a big central engine to run a propeller by way of an prolonged driveshaft, and a separate rudder system for steering, these models combine all of these powertrain and operating gear parts right into a horizontally gimbaled subaquatic pod put in on the keel of the ship.
The pod then serves as each a propulsion and steering mechanism that features 360-degree rotational capabilities made doable by the slip rings that ship electrical energy. This full rotation permits every pod to direct thrust exactly the place it is wanted to maneuver within the desired route, making a separate rudder system pointless whereas vastly enhancing maneuverability to the purpose of giving huge ships the power to show in place, very like a torque-vectoring electrical automobile does on land.
Past elevated maneuverability, pod drives additionally boast improved effectivity, utilizing their full rotational capabilities to direct thrust in essentially the most environment friendly approach for the present route of journey and circumstances whereas additionally smoothening out energy-sapping vibrations and eliminating the added drag of rudder parts.
In line with Swedish-Swiss multinational ABB Group, which now markets the Azipod – the very first electrical pod drive launched within the early Nineteen Nineties, open-water vessels generally take pleasure in power consumption reductions between 5 and 15 p.c when propelled by an Azipod system, with decreases as a lot as 20 to 25 p.c doable.
ABB
That is no small financial savings when speaking about one thing like a cruise ship that sucks up a whole lot of 1000’s, even thousands and thousands, of gallons of gasoline when pushing from port to port. A few years back, a research by Deltamarin discovered Azipod-driven ferries might save as much as US$1.7 million in annual gasoline prices.
That suite of benefits has established the pod drive as a well-liked answer for among the largest seagoing vessels – cruise liners, container ships, tankers and ferries, to call just a few. We have beforehand checked out how a pod’s capability to rotate directional propulsion 180 levels between a “pulling” orientation and a “pushing” orientation has been a selected boon to polar-ready icebreaking ships.
However Helix believes pod drives have a great deal of untapped downmarket potential, explaining that they’ve lengthy been restricted to make use of in giant vessels due to the ability density shortcomings of typical electrical motors. In an effort to obtain the excessive ranges of energy required to propel a ship, it has been obligatory to put in large motors inside even huger underwater pods, inducing excessive ranges of drag. It is solely within the very giant megawatt+ vary that drag, as proportionate to energy, decreases sufficient to appreciate the effectivity positive factors of pod propulsion. In smaller pods, the proportional drag turns into too excessive to beat.
Helix
Helix is able to shift your complete equation by way of its quickly evolving electrical motor topography, which creates excessive ranges of energy and torque from tiny, ultra-lightweight packages. Whereas Helix’s top-tier 25-kW/kg SPX177 motor was developed by its experimental division for a hypercar prototype, not optimized for mass market use, the SPC177 radial flux motor it plans to make use of for its marine pod ecosystem nonetheless gives a excessive density as much as 9.7 kW/kg, placing out 300 kW of steady energy from a 31-kg (68-lb) bundle.
At that sort of energy density degree, the drag induced by the pod physique turns into trivial at sub-megawatt sizes, Helix causes, opening the door for the environment friendly propulsion of small to midsize boats. In truth, the corporate goes as far as to say its small, highly effective motor development will enable shipbuilders to chop 70 p.c of the drag as in comparison with conventional (huge) pod drives.
Helix
Slightly than creating full pods, Helix intends to create modular flexibility by supplying what it calls Pod Cartridges to builders of sub-megawatt, small to midsize leisure, industrial and passenger vessels. Every cartridge might be a plug-and-play set of pod internals for shipbuilders and propulsion methods producers to suit inside their very own subaquatic pod buildings and pair with propellers, battery methods, electrical mills, and management software program options specced for the precise necessities of the vessel in query.
Every of the launch cartridges will embrace an SPC177 motor packaged with an Xtrac gear discount system, CAN bus interfaces, bearings and seals, and out there Helix inverter.
“By releasing up deck house beforehand reserved on the transom for outboard motors, or inside house reserved for engine compartments and propeller shafts, our Helix Pod Cartridge gives the trade a generational probability to revisit the way it designs vessels,” Helix’s chief marine engineer James Edwards mentioned throughout final month’s announcement, “all whereas unlocking extra environment friendly journey and serving to marine in its journey in direction of web zero emissions.”
Helix offers examples of utilizing the additional hull quantity to make a trawler extra comfy and practical for fishermen or a yacht extra enjoyable and pleasurable for leisure prospects.
Three sub-megawatt Pod Cartridge sizes might be out there at launch: 100, 200 and 300 kW. The 100 and 200 fashions might be provided in each low- and high-torque variations, and Helix plans to ultimately increase out the lineup to output sizes between 480 kW and three MW.
Helix
Given the restricted ranges of battery-powered electric boats, you may be questioning how precisely marine operators energy a traditional multi-megawatt electrical pod motor. It is not by mere battery, requiring an onboard electrical era system utilizing the likes of diesel gasoline or hydro era.
Equally, Helix notes that Pod Cartridge prospects will be capable to develop their very own energy methods, whether or not comprising purely batteries or a sequence hybrid setup that develops electrical energy from a diesel generator or different supply. Unsurprisingly, the corporate expects prospects to skew towards hybrid methods within the preliminary levels.
Supply: Helix
