Tech • AI • Robotics • Game
Elon Musk's Next-Gen Motor Destroys the Entire EV Industry
9.4/10TL;DR
Tesla is advancing a rare earth-free drive unit for the Cybercab to cut supply-chain risk and lower costs, while separate signs point to a long-delayed Roadster with active aerodynamics and extreme performance targets.
KEY POINTS
Why Tesla wants to eliminate rare earths
Since 2017, starting with the Model 3, Tesla has relied on neodymium permanent-magnet motors for compact size and strong cruising efficiency. But those motors often need small amounts of heavy rare earths such as dysprosium and terbium to resist heat-related loss of magnetism, creating a critical dependency on a tightly concentrated supply chain.
China’s dominance creates a bottleneck
China processes about 90% of the world’s rare earth elements and produces roughly 90% of rare earth magnets. Even a few dozen grams of dysprosium or terbium can determine whether a high-performance EV motor can be built, which means a tiny materials shortfall can stop production of vehicles worth tens of thousands of dollars.
Export controls exposed the risk
In April last year, China added export controls on seven medium and heavy rare earth elements, including dysprosium and terbium, as well as some magnets containing them. The disruption spread quickly through the auto sector, with Ford temporarily halting Explorer production in Chicago, while Tesla also faced delays in magnet supplies for Optimus robot joints.
The new Cybercab motor appears to be the answer
Tesla said in March 2023 that its next-generation permanent-magnet motor would use zero rare earth elements. The drive unit later shown for the Cybercab is reported to be 18% smaller and 25% lighter than Tesla’s previous high-performance unit, while also improving efficiency.
Ferrite magnets are the leading theory
Tesla has not disclosed the magnet chemistry, but engineering speculation has centered on ferrite magnets, which are inexpensive, iron-based and abundant. Their drawback is far lower magnetic energy than neodymium, so the likely breakthrough is not a stronger magnet but a smarter motor architecture that uses available magnetic flux more effectively.
A redesigned motor could offset weaker magnets
One plausible approach is a Halbach array, a configuration that concentrates magnetic field strength on one side and cancels much of it on the other. Combined with Tesla’s packaging and electromagnetic design, that could allow a weaker magnet system to achieve competitive performance, higher efficiency and reduced material vulnerability.
Cybercab is optimized for robotaxi economics
The Cybercab uses a rear-mounted 163 kW three-phase AC permanent-magnet synchronous motor, a single-speed gearbox and regenerative braking through the driven wheels. With a vehicle weight of about 1,412 kg and a battery near 48 kWh, energy use is put at roughly 165 Wh/mile, aligning the powertrain with low operating cost rather than maximum straight-line speed.
Manufacturing speed is central to the strategy
The drive unit uses hairpin windings with a slot fill factor of around 70%, improving resistance and heat management, and can spin above 15,000 rpm. Tesla says the line is fully automated and produces one completed drive unit about every 10 seconds, a cycle time aimed at high-volume output under its unboxed manufacturing approach.
The cost implications could be large
Rare earth permanent magnets can account for roughly 25% to 35% of an electric motor’s material cost, in some cases exceeding the value of copper in the stator or the laminated electrical steel. Removing them could give Tesla a meaningful advantage if Cybercab production reaches the multi-million-unit scale planned for a robotaxi fleet.
The benefits could extend beyond cars
A rare earth-free motor architecture would also matter for Optimus, where each humanoid robot could require dozens of actuators across the arms, legs, hands and torso. Tesla has not indicated that Model 3, Model Y or Cybertruck will immediately adopt the same design, but success in one platform could influence a much broader product range.
Roadster signs point to active aero and delayed launch
Separate filings and teasers suggest the next Roadster may use an active rear wing that can increase downforce, reduce drag, retract in a collision and interface with driver-assistance systems. Tesla’s long-standing claims include 0-60 mph in under 2 seconds, a sub-1-second launch with an optional SpaceX cold-air thruster package, about 620 miles of range, more than 250 mph top speed, a starting price near $200,000, and possible production around 2027 at Gigafactory Texas.
CONCLUSION
Tesla’s rare earth-free motor effort is as much a supply-chain and manufacturing strategy as an engineering project. If the Cybercab system performs at scale, it could reshape how EVs and robots are built by reducing reliance on some of the world’s most concentrated critical materials.
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