$NVDAB Tesla Cybercab hits the road: rare-earth-free motor and a new Robotaxi paradigm
In early September, Tesla’s autonomous taxi Cybercab officially began operations in Austin, Texas, with the first batch of about 45 vehicles operating as Robotaxis within a designated city area. Along with the fleet rollout came a drive unit Musk described as "extremely difficult to achieve" — a rare-earth-free permanent magnet motor.
Zero rare earths, no loss in range
Musk confirmed on X that Cybercab’s motor "contains no rare earth metals at all, but the range is exactly the same". EPA certification data shows that this 1,412-kilogram two-seater can achieve a combined range of 673 kilometers on about 48 kWh of electricity, with energy consumption as low as 10.2 kWh per 100 kilometers, setting a new high for mass-produced electric vehicle efficiency.
The drive unit volume is reduced by 18% and the weight by 25%, with the production line cycle time pushed to within 10 seconds.
Ferrite + magnetic circuit design—use engineering to make up for the physical gap
Tesla hasn’t disclosed the exact magnet materials, but industry consensus widely suggests it uses a ferrite permanent-magnet solution. Ferrite contains no rare earths; its magnetic energy is only about one-tenth of that of neodymium-iron-boron, and it’s also prone to demagnetization at high temperatures.
Tesla’s solution is a set of integrated moves: arrange magnets in a Halbach array to concentrate the magnetic field toward the working side; use a comb-like flat wire winding to raise slot fill ratio from roughly 40% in traditional designs to 70%; and combine improved heat dissipation and lubrication to push the motor speed to above 15,000 rpm—using high rotational speed to achieve a smaller size. Reluctance torque is also driven to the limit: with magnetic-circuit design, it extracts enough power from "weak-field" materials.
Rare-earth permanent magnets account for about 25%–35% of a motor’s material cost. Remove that portion, and the cost advantage becomes significant after scaling up. It also directly addresses supply-chain anxiety: China controls more than 90% of global rare-earth separation capacity. Export controls in 2025 once caused Tesla’s Optimus robot mass-production plans to stall.
From consumer product to production tool
The Cybercab’s real disruption isn’t in the motor, but in its positioning. Two seats, no steering wheel, no pedals, and pure vision-based sensing—every subtraction is made to give way to operational efficiency. It’s Tesla’s first front-wheel-drive vehicle. By doing away with the rear subframe and the drive shaft, it pushes "good enough" to the extreme.
For buyers, the Cybercab isn’t a traditional private car—it’s a production tool that can take orders 24 hours a day. It runs trips and charges itself, without a driver and without needing a dedicated parking spot. With that, the operating logic changes, and the car’s nature shifts from consumer product to an asset.
However, the limitation still remains
What needs to be addressed calmly is that this zero-rare-earth motor has currently only been confirmed for the 1,412-kilogram Cybercab. With a ferrite-based solution, the power density is about 60%–80% of that of rare-earth permanent magnets. Reliability under high temperature and high load in heavier vehicles is still unknown. From the Cybercab to the Model Y and Cybertruck, the entire lineup has done away with rare earths—there is still a long engineering road ahead.
In one sentence: Tesla has proven, with a two-seat small car, that a zero-rare-earth permanent-magnet motor is feasible in engineering. But the real test is whether it can replicate that statement in the next mass-production vehicle.