Axial-flux motors deliver high torque in a short, flat package, which suits direct-drive lift rotors. Compare continuous power, torque, mass and cooling across manufacturers.
In an axial-flux motor the magnetic flux crosses the air gap parallel to the shaft, between disc-shaped rotors and stators. The result is a short, flat machine with a large active diameter, which produces high torque without a gearbox.
Why they suit lift rotors
Torque grows with the radius at which the magnetic force acts. Because an axial-flux motor puts its active material at a large radius in a short length, it can drive a large, slow lift rotor directly. Removing the gearbox saves mass, removes a maintenance item and a failure mode, and reduces noise.
Configurations
Single rotor, single stator: the simplest and most compact layout.
Double rotor, single stator (often yokeless): two magnet discs around one stator, a common high-power-density layout.
Multi-stage stacks: several rotor and stator pairs on the same shaft to increase torque.
Trade-offs to check
Manufacturing tolerance: the axial air gap must be held precisely against strong magnetic attraction.
Cooling: the stator sits between the rotors, so heat removal is a design focus; liquid cooling is common at high power.
Mechanical loads: the large diameter has to resist gyroscopic and rotor loads.
Speed range: axial-flux machines are at their best at moderate speeds and high torque; for very high speeds a radial-flux motor may be lighter.
What to compare
Compare continuous torque and power at the same coolant or ambient temperature, the mass with and without the inverter, the efficiency at cruise and whether the motor has redundant windings. The listing above filters only axial-flux products; the electric motors page covers every topology.
Frequently asked questions
What is an axial-flux motor?
An electric motor in which the magnetic flux runs parallel to the shaft, between disc-shaped rotors and stators. It is shorter and flatter than a conventional radial-flux motor and produces high torque for its size.
Do axial-flux motors need a gearbox for eVTOL rotors?
Usually not. Their high torque at low speed is what lets them drive lift rotors directly, which is one of the main reasons eVTOL designers choose them.
Are axial-flux motors harder to cool?
The stator sits between the rotor discs, so heat has a longer path out than in many radial-flux designs. Manufacturers solve it with direct liquid cooling of the stator or with careful air paths; compare continuous ratings at the stated cooling conditions.
A literature-based review of how axial-flux permanent-magnet machines are sized for direct-drive lift rotors: hover torque requirement, torque-sizing relations, design and optimisation methods, reported parameter ranges, fault behaviour and regulatory context.
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