YASA Axial Flux Electrical Motor Makes 1000+ HP – However Weighs Simply 28 Kilos!

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Earlier this 12 months, UK-based YASA amazed the world by exhibiting off an axial flux electrical motor that weighed simply 13.1 kg (29 lb) and was rated at 550 kW (738 hp), for an power density of 42 kW per kg. Now it’s again with a brand new and improved model of that motor that weighs much less — 12.7 kg (28 lb) — and is able to a staggering 750 kW (1018 HP) peak energy, which is definitely a world report for power density at 59 kW per kg.

So what’s an axial flux motor anyway? Is it by some means associated to the legendary flux capacitor within the Delorean that starred within the film Again To The Future? No, it’s not. In line with Wikipedia,

“An axial flux motor is a geometry of electrical motor building the place the hole between the rotor and stator — and subsequently the course of magnetic flux between the 2 — is aligned parallel with the axis of rotation, relatively than radially as with the concentric cylindrical geometry of the extra widespread radial flux motor.

“With axial flux geometry, torque will increase with the dice of the rotor diameter, whereas in a radial flux the rise is simply quadratic. Axial flux motors have a bigger magnetic floor and total floor space (for cooling) than radial flux motors for a given quantity.”

How The YASA Motor Works

Three years in the past, after Mercedes-Benz purchased YASA, we reported that the axial flux motor is the mind little one of Tim Woolmer, who got here up with the thought whereas a Ph.D candidate at Oxford College.

“I used to be 5 weeks into my Ph.D at Oxford College, once I abruptly realized there was a a lot better method to construct an electrical machine known as a torus axial-flux motor. The perception I had was that by eradicating the motor’s stator yoke, and splitting it into segments, we might cut back the motor’s weight — and but on the identical time enhance its torque, energy density, effectivity and manufacturability, making it doubtlessly transformative throughout the then nascent electrification business.”

What’s so nice about an axial flux motor? A number of issues. It’s lighter and thinner than the radial flux motors that energy most electrical automobiles as we speak, but it has as much as 4 occasions the torque output. Merely put, it does extra with much less and is extra environment friendly as nicely. The one space the place it doesn’t excel is in final high velocity, which is of little curiosity to the overwhelming majority of motorists.

On its web site, YASA explains the core benefit of an axial flux motor is that the spinning rotor has a bigger diameter as a result of it turns alongside the stator relatively than inside it. Torque equates to power multiplied by radius. With an axial flux design, there’s a bigger radius than in a traditional radial motor, which suggests extra torque from a given quantity of for the everlasting magnets and copper windings

The YASA motor topology additionally removes the stator yoke, which reduces the stator iron mass by as much as 80%. This innovation supplies a big energy density benefit and a 5 to 10% vary enchancment over the standard radial motors.

What Does YASA Imply?

YASA axial flux electrical motors characteristic a proprietary Yokeless And Segmented Armature — that’s the place the corporate identify comes from. Its armature windings encompass separate segments ideally suited to mass manufacture with minimal software engineering. Whereas its peak energy is spectacular, the corporate estimates that its steady energy will likely be within the area of 350 to 400 kW (469 to 536 hp). On its web site, YASA says,

“Designed and developed at YASA’s high-tech Oxford Innovation Centre, the breakthrough represents one other main validation of the corporate’s axial flux expertise. And crucially, this isn’t a theoretical mannequin or digital idea: it’s a absolutely useful prototype, present process a rigorous improvement program. Compact, scalable and with no unique supplies used, it achieves distinctive efficiency by precision engineering, superior thermal administration and optimised packaging. This extraordinary motor design has been developed and realised with help from the Superior Propulsion Centre, UK.”

Don’t gloss over that “no unique supplies” a part of the announcement. Uncommon earth minerals are a scorching subject as we speak because the US and China play “my tariffs are larger than yours.” Many electrical automobile producers depend on them, however China controls about 95% of the worldwide uncommon earth provide chain. Now it’s threatening to vastly diminish the provision or uncommon earth minerals outdoors of China.

Simon Odling, YASA’s head of latest expertise, commented, “The early outcomes are extraordinarily encouraging. The motor’s efficiency on the dyno has exceeded even our most optimistic simulations. In addition to its unimaginable peak energy and total energy density, we estimate this new motor will be capable of ship all-important steady energy within the area of 350kW-400kW. That is actual {hardware}, in actual life, delivering actual information — and it’s performing superbly.”

“This report demonstrates what makes YASA distinctive,” added Joerg Miska, CEO of YASA. “With thrice the efficiency density of as we speak’s main radial flux motors, YASA continues to redefine the boundaries of what’s doable in electrical motor design — turning pure innovation into tangible engineering progress. Our expertise is delivering measurable outcomes as we speak, whereas paving the best way for a brand new era of light-weight, environment friendly electrical propulsion techniques.”

The Mercedes Idea AMG GT XX

Earlier this 12 months, Mercedes unveiled its C0ncept AMG GT XX, a four-passenger sports activities sedan that units daring new requirements for the way forward for automotive design, however it’s greater than that. It’s the first idea from Mercedes powered by YASA axial flux motors — two on the rear and one on the entrance.

In a press assertion, Mercedes stated, “Axial flux motors provide many advantages — they’re considerably extra compact, lighter and, above all, extra highly effective than typical electrical motors. The ability density of axial flux motors is round thrice that of typical electrical motors. On the identical time, the modern motors are round two-thirds lighter and are only one third of the scale.”

The 2 rear motors are simply 3.1 inches vast whereas the entrance motor is a tad wider at 3.5 inches. “This compact motor design provides extra flexibility in the case of drivetrain packaging,” the corporate stated. That’s an essential level. Automotive engineers are simply starting to discover how battery-electric powertrains can open new design potentialities which might be merely not doable with the array of engines, transmissions, and differentials wanted to make a traditional automobile go.

Prepared Proper Now

YASA is fast to level out that the brand new motor will not be some “by no means to be seen outdoors of a laboratory” experimental merchandise, however relatively “proof of what centered engineering innovation can obtain. And this isn’t an idea on a display screen. It’s operating, proper now, on the dynos. We’ve constructed an electrical motor that’s considerably extra power-dense than something earlier than it — all with scalable supplies and processes. This motor will convey game-changing expertise to the excessive efficiency automotive sector.”

Does “excessive efficiency” imply it’ll solely be utilized in excessive greenback automobiles? In all probability, at the least at first. YASA motors are being utilized by Ferrari and some different producers of unique automobiles. However with quantity comes decrease costs. We might not see axial stream motors in our battery-powered Honda Civics anytime quickly, however we are going to ultimately. Simply as the value of photo voltaic panels has plummeted over the previous ten years, the price of these motors will fall quickly as nicely. We are able to’t wait!