A Chinese team says it has built an axial-flux motor that pushes power density to 25.73 kW/kg, or 35 hp/kg, while spinning above 18,000 rpm. The claim comes from Pangoo Power, working with engineers at the Ningbo Institute of Material Technology and Engineering, and if it holds up outside the lab, it could make electric powertrains smaller, lighter, and much easier to package.
The Pangoo Power axial-flux motor record is the headline here. High power density is one of the few motor metrics that can still move the needle for electric cars, robotics, and electric aviation, where every kilogram is a tax. China has been stacking similar advances across the EV sector, and that pressure is forcing motor makers to chase not just more power, but more power per unit of mass.
Why axial-flux motors keep coming back
Axial motors are not a shiny new idea dressed up in modern marketing. Michael Faraday described the basic disk-motor principle in the 19th century; what changed is that materials and manufacturing have finally caught up enough to make the geometry useful. In an axial design, the magnetic field runs along the rotation axis rather than from the center outward, which helps place the active area where torque can be extracted more efficiently.
That geometry is also why engineers keep circling back to it. Compared with conventional radial motors, disk-shaped layouts can cut length and mass sharply, with some estimates putting the reduction at as much as 50% for similar power. For an EV maker, that can mean more usable cabin space, better chassis packaging, and a few extra miles of range without resorting to larger batteries.
The magnet problem was always the catch
The weak link has usually been heat. At high speeds and sustained loads, magnets in axial motors can lose magnetization, which drags performance down and makes the whole concept feel more elegant than practical. Pangoo Power says its new magnetic alloy and microstructure improve thermal resistance and resistance to demagnetization, letting the motor stay stable at high rpm without the usual slide in output.
That matters more than the marketing gloss. A motor that looks brilliant for a minute and then fades under load is useful mainly as a conference slide; one that can sustain its numbers starts to look like hardware a manufacturer might actually build around. Competitors such as Xiaomi Auto and BYD are already making powertrains more aggressive, which raises the bar for everyone else trying to turn lab performance into production parts.
What the 35 hp/kg claim would change
If the figure is repeatable in real-world use, the downstream effects are easy to guess. Lighter motors leave more room for structure, cooling, and batteries; in aircraft, they reduce the burden on the airframe; in robots, they let designers move fast without carrying dead weight. The catch is that none of those markets forgive numbers that only work in ideal test conditions.
- Reported output: 25.73 kW/kg
- Equivalent claim: 35 hp/kg
- Operating speed: above 18,000 rpm
- Architecture: axial-flux, or disk motor
The bigger question is not whether axial motors are clever; they are. It is whether this round of Chinese motor development marks the moment when the format moves from promising engineering to mainstream production, or whether it stays stuck in the familiar gap between record claims and the boring realities of mass manufacturing.