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Axial-flux motors appeal to EV makers because they can deliver high torque and power from a short, disc-shaped package. YASA and Mercedes-Benz promote substantial gains in power density and packaging, and the technology has reached production vehicles. But those advantages do not yet establish that axial-flux motors are cheaper, longer-lived or better for every electric car.
What an axial-flux motor is—and how it differs
In an axial-flux motor, magnetic flux runs parallel to the motor’s rotation shaft. Two rotor discs sit on either side of a stator, giving the motor a broad, flat shape. In the more familiar radial-flux motor, the magnetic flux runs outward from the center through a cylindrical arrangement. Mercedes-Benz describes the axial arrangement in its production announcement.
The geometry changes the packaging trade-off: an axial-flux motor can be short along the shaft while remaining wide across it. Its larger effective radius can also help generate torque. That does not mean every axial motor is smaller overall; the result depends on the motor’s dimensions, cooling, gearbox and vehicle installation.
Why automakers are interested
More output in a constrained space
YASA says its yokeless, segmented-armature design removes up to 80% of stator-iron mass and can achieve two to three times the power density of non-axial machines. It also claims up to 800 Nm, four times the torque density of other EV motors, and 50% less volume and weight than a radial equivalent. These are company claims, not universal results for axial-flux motors. YASA further estimates that reducing vehicle mass could create a 5–10% efficiency and range opportunity; that is a projected vehicle-level opportunity, not a guaranteed gain for a particular car.
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- High‑Quality Material: Multi‑layer PCB coil structure, high‑strength transparent acrylic stacking bracket, durable propeller and metal fasteners. Precision‑assembled magnetic components for stable power output.
- Practical Design: Unique stacked axial‑flux structure, visible internal coil layout. Equipped with propeller for intuitive high‑speed rotation demonstration, adjustment knob for convenient speed control.
- Easy to Use: Pre‑assembled electronic modules, no complicated soldering. Just connect power supply, adjust knob to change rotating speed, easy to observe axial‑flux motor electromagnetic working principle.
- Safe & Durable: Stable stacked acrylic frame reduces shaking during high‑speed running. Fine‑processed propeller, solid fastening structure, avoid loose parts for short‑time demo operation.
- Widely Applied: Perfect for electromagnetic physics teaching, popular science demonstration, tech‑theme desktop ornament, maker lab display, suitable for students, electronic enthusiasts and tech collectors.
Mercedes-AMG’s CONCEPT GT XX release describes a three-motor demonstrator with more than 1,000 kW peak output. Mercedes-AMG says its system offers roughly three times the power density of conventional motors and needs only one-third of their installation space. These figures apply to that high-performance demonstrator, not to axial-flux motors as a category.
Heat management and repeatable output
Peak power is not the same as power a motor can sustain. YASA argues that shorter windings and direct oil cooling improve heat transfer, helping the motor maintain higher output. Its illustrative comparison says a 200 kW peak radial motor might sustain 80–100 kW, while a 200 kW YASA motor can sustain 150 kW. This is the company’s example, not an independently audited or fleet-wide comparison.
Rank #2
- Delivers up to 10.4 kg thrust per axis
- Engineered for 2.5–5 kg single-axis payloads
- Optimized for use with 18–24 inch carbon fiber propellers
- Supports a broad voltage range from 6S to 12S
- Lightweight motor design at 214g
For a fair comparison, sustained output and cooling conditions matter alongside peak figures. A motor that produces more power briefly may not maintain it under prolonged load if heat causes it to derate.
What published specifications show
A 2026 peer-reviewed review of axial-flux in-wheel motors lists these product-specific figures. They are not a controlled head-to-head comparison: duty cycle, cooling, voltage and test conditions must be considered before ranking products.
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Rank #3
- 【Wide Application Scenarios】: Ideal for axial flux generators, DIY wind turbines, and micro hydro power systems. Suitable for small-scale off-grid energy projects, DIY renewable power builds, and backup power setups, meeting various low-power generation needs.
- 【Coreless Disc Coil Design】: Features advanced coreless technology to reduce iron loss, enhance power generation efficiency, and minimize magnetic drag. The disc-shaped design ensures smooth operation and stable performance in DIY power systems.
- 【Precise Dimension Options】: Available in 4 specifications: 90mm diameter × 5mm thick, 90mm × 9mm thick, 160mm × 5mm thick, and 160mm × 9mm thick. Each variant is made to exact dimensions for proper fit in different generator builds.
- 【Durable Construction】: Built with heat-resistant materials rated up to 105℃ for reliable use in diverse environments. The robust winding structure resists wear and maintains consistent output during long-term operation.
- 【Efficient Power Generation】: Designed for 300W power output, delivering stable energy conversion for small-scale power systems. Ideal for DIY enthusiasts building low-wattage renewable energy projects at home or off-grid locations.
| Motor | Peak power | Peak torque | Speed | Peak efficiency | Mass | Peak power density |
|---|---|---|---|---|---|---|
| YASA 750R | 200 kW | 790 Nm | 0–3,250 rpm | Over 95% (motor peak) | 37 kg | 5.4 kW/kg |
| Magnax AXF275 | 300 kW | 500 Nm | 8,000 rpm | Not stated in the review | Not stated in the review | Not stated in the review |
These numbers describe specific motors, not a typical axial-flux design. Peak efficiency is not the same as efficiency over a drive cycle, and peak power density does not reveal continuous output, full drive-unit mass or the effect on a vehicle’s range.
Where axial-flux motors have reached production
| Date | Production or vehicle milestone |
|---|---|
| 2018 | YASA says it opened a serial-production facility near Oxford. |
| 2019 | YASA identifies Ferrari as its first volume-production OEM customer. |
| 2021 | YASA became a wholly owned Mercedes-Benz subsidiary to develop motors for the AMG.EA platform. |
| 2024 | YASA says the Lamborghini Temerario hybrid uses three of its axial-flux motors. |
| 2025 | YASA says a £12 million investment supported an Oxfordshire factory designed to scale beyond 25,000 units per year. This is a stated design capacity, not a reported annual output. |
| June 9, 2026 | Mercedes-Benz announced that large-scale axial-flux motor production had begun at Berlin-Marienfelde. The first named production vehicle is the new Mercedes-AMG GT 4-Door Coupe. |
Mercedes-Benz says the front-axle motor exceeds 15,000 rpm and that three motors are packaged into high-performance electric drive units with compact planetary gearboxes. The company reports 98 production steps, including 35 processes it calls new worldwide, and more than 30 patent applications for the manufacturing technology. These details indicate manufacturing complexity as well as investment in scaling the design.
Rank #4
- 1.Advanced 12N14P Brushless Motor – 12 stator slots and 14 permanent magnets provide low cogging, smooth start‑up, and stable rotation.
- 2.Wide Voltage Compatibility – Works with 12V, 24V, or any DC supply in between (12‑24V).
- 3.Energy Efficient – Typical operating power only 4‑5W, ideal for battery‑powered or low‑power systems.
- 4.Speed Adjustable – Built‑in potentiometer allows continuous speed control from 1000 to 1500 RPM.
- 5.Quiet & Balanced – The 85 mm 3‑blade propeller and precision motor reduce vibration and noise during high‑speed rotation.
Are axial-flux motors better than radial-flux motors?
There is no general winner established by the available figures. Axial-flux motors have a persuasive case where high torque and power density or a short motor package are priorities. Whether that translates into a better car depends on the complete drive unit and vehicle, not just the motor’s peak specification.
- Power and torque density: compare both peak and continuous output, normalized by mass and volume.
- Thermal repeatability: account for cooling method, operating conditions and output derating under sustained load.
- Packaging: consider motor length and diameter, gearbox integration and the vehicle architecture they enable.
- Manufacturing maturity: weigh process complexity, tolerances, automation, magnet and copper use, and achieved production volume.
- Whole-vehicle result: judge mass, battery size, efficiency on a defined drive cycle and serviceability—not motor claims in isolation.
Radial-flux motors remain the familiar reference point, but the cited specifications do not provide a like-for-like test against a named radial motor under matching conditions. Manufacturer claims about density or installation space therefore should not be treated as proof that every EV would benefit from switching.
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What are the disadvantages and unresolved questions?
The design’s performance pitch does not answer the ownership and manufacturing questions a mass-market buyer would care about. The sources available here do not establish a comparable long-term dataset for purchase cost, lifetime durability, repair rates or total ownership cost versus radial-flux motors. Nor do the cited peak specifications alone show how an axial-flux motor performs over years of use or across varied driving conditions.
Manufacturing maturity is another consideration. Mercedes-Benz’s reported production process includes many steps and new processes, while YASA describes factory investment and a target capacity. Those milestones demonstrate movement toward scale, but do not by themselves establish the cost or serviceability of motors across a broad range of vehicles.
When might axial-flux motors become common?
They are no longer only a concept: YASA reports use in Ferrari volume production and in the 2024 Lamborghini Temerario, while Mercedes-Benz announced large-scale Berlin production for the AMG GT 4-Door Coupe in June 2026. That evidence supports adoption in premium and specialized applications. It does not establish when—or whether—the technology will become common in mass-market EVs. Broader adoption will depend on manufacturing economics and field evidence on durability, repairs and whole-vehicle benefits.
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