[Inside the EV Heart] Part 6: Breaking Free from Rare Earth Extortion! No Expensive Magnets? The Engineering Miracle of Rare-Earth-Free Motors
Welcome to the Inside the EV Heart series! In our previous article, we witnessed how the Permanent Magnet Synchronous Motor (PMSM) uses super-strong permanent magnets to deliver terrifying acceleration. But behind this cutting-edge technology hides a fatal flaw that gives global automakers a massive headache: rare-earth dependency.
To manufacture those super magnets, we need rare-earth metals like Neodymium (Nd), Praseodymium (Pr), and Dysprosium (Dy). But not only are these materials incredibly expensive and environmentally disastrous to mine, they also face severe geopolitical and export control risks due to being highly concentrated in a single country. If we can't buy rare earths, do we just stop making EVs?
Of course not! The mad engineers of 2026 decided: "If magnets are such a hassle, let's just ditch them completely!"
The Most Indestructible Minimalist Iron Block: The Switched Reluctance Motor (SRM)
If you had to pick the structurally simplest motor in the world, it would absolutely be the Switched Reluctance Motor (SRM). Its rotor is a solid iron core made of stacked silicon steel plates, with gear-like protrusions. No copper wires, and absolutely no magnets!
Its principle is remarkably similar to playing with a magnet and a nail: when the outer electromagnets are energized, the iron teeth on the rotor, seeking the position of "shortest and easiest magnetic flux lines" (the principle of minimum reluctance), are forcibly pulled into alignment. Just like that, the motor spins.
Early SRMs were cheap and incredibly durable, but they generated massive noise and vibration when spinning, making them completely unviable for passenger cars. But by 2026, engineers introduced "Microsecond Predictive Control (MPC) algorithms" and Silicon Carbide (SiC) inverters to precisely control the force of every electrical pulse, successfully suppressing the noise. Now, even budget passenger cars are gearing up to use them!
A Beast with Cheap Ingredients: The Synchronous Reluctance Motor (SynRM)
Another sibling is the Synchronous Reluctance Motor (SynRM). To generate more power, engineers carved out multiple layers of complex "Flux Barriers" (air gaps) inside its rotor to precisely guide the path of the magnetic flux lines.
The most fascinating new trick of 2026 is Hitachi Astemo's "Magnet-Assisted Synchronous Reluctance Motor." Since they can't afford rare-earth magnets, they stuffed super cheap, widely available "ferrite magnets" (whose main ingredient is basically iron oxide) into the rotor's gaps. Although ferrite has a weak magnetic force, combined with a special flux-concentrating structure and extreme oil-cooling technology, this motor can still unleash a massive 180 kW of power, completely breaking free from rare-earth extortion!
Tesla's Insane Dark Tech: Putting the Motor in a "Carbon Fiber Bodysuit"
Tesla's fourth-generation drive unit, mass-produced in 2026 (equipped on the Cybercab platform and the refreshed Model Y), officially declared the achievement of a "Zero Rare-Earth Permanent Magnet Motor"!
As mentioned earlier, cheap non-rare-earth magnets have one major flaw: they are too brittle. If you rev the motor up to 20,000 rpm, the immense centrifugal force will literally shatter these fragile magnets into pieces.
To counter this, Tesla borrowed tech from the aerospace industry, using high-tension "carbon fiber" to tightly wrap and bind the entire rotor. This "carbon fiber bodysuit" perfectly resists the expansion forces, protecting the fragile magnets inside. Even more mind-blowing is that this pushed the cost of a single motor down to the absolute limit of under $1,000!
Alchemy Come True? Iron Nitride and Contactless Power Supply
Besides the methods above, 2026 brought two more jaw-dropping technological marvels:
- Synthetic Super Magnets: Stellantis teamed up with materials companies to unveil an "Iron Nitride (Fe16N2)" motor. Synthesizing a material out of the earth's most abundant "iron" and "nitrogen" that theoretically possesses a stronger magnetic force than top-tier rare-earth magnets is practically modern alchemy!
- Wireless Charging Motors: BMW and Renault abandoned permanent magnets altogether, opting to use the stator to transmit electricity to the rotor to create a magnetic field (Electrically Excited Synchronous Motor, or EESM). Even wilder is ZF's system, which directly incorporates "high-frequency wireless induction" inside the motor. It completely eliminates the physical brushes used for power transmission, resulting in zero physical wear.
Watching engineers force these crazy ideas into reality just to shake off rare-earth dependency gets your blood pumping, doesn't it?
However, everything we've looked at so far are independent, standalone motors. In the ultimate endgame of 2026, the "shape" and "location" of these motors undergo an even more unbelievable transformation—they are shoved straight into the tires! Stay tuned for the grand finale of the series: [2026 The Future is Here] Shoving Motors into Tires? "In-Wheel Motors" and the 12-in-1 Hyper-Integrated Electric Drive!
