In a key move, Tesla is looking to rid its electric vehicles of rare Earth minerals, potentially eliminating the biggest environmental concern over the increasing number of EVs on the road, it has been revealed.

The surprise announcement came during Tesla's Master Plan 3 Investor event where the company outlined its business strategy for the next few years. At one point, according to Wired, a member of Tesla's power train executive team, Colin Campbell, declared that the power train team were going to eliminate rare Earth magnets from the motors over concerns about the instability of supply of such minerals, as well as their often high toxicity during mining. 

Campbell presented a few slides to show the investors that showed the weight of rare Earth materials used in the company's Model Y motors (which amounted to about 520g worth).

'Next generation permanent magnet motor'

In a subsequent slide, Campbell showed off what Tesla calls its "next generation permanent magnet motor", which did not include a single gram of rare Earths.

Tesla did not indicate which rare Earth minerals they were referring to, but it appears that the culprits are obvious to EV engineers, with fully 500g of neodymium making its way into every Model Y. When neodymium is combined with other elements like iron, the metal can generate an always-present magnetic field powerful enough to move a car as large as the Model Y.

Unfortunately, there aren't a lot of minerals in the world that can have this kind of effect, so a number of engineers and scientists that Wired spoke to expressed doubt that Tesla would be able to pull something like this off.

Without neodymium, a few of the experts Wired talked to pointed to old-fashioned ferrite, an iron-and-oxygen ceramic material that has long been used for commercial magnets, as a possible replacement. Unfortunately, it's not known how ferrite, which is about 10 times weaker than the neodymium magnets currently being used, will manage to move a nearly 2,270kg vehicle using what are essentially large kitchen magnets. 

At present, Teslas are powered by permanent magnets in the rear wheels with the front wheels using externally provided electrical current to generate the required electrical field to turn the wheels.

Sourcing minerals like cobalt isn't just expensive, it's also potentially hazardous, especially for mine workers, and the supply from mines is becoming increasingly unstable.

A lot more than half of the rare Earths mined in the world come from China, which also processes these minerals into magnets. Some estimates put the number of magnets processed in China at more than 90% of the total world's supply.