It's not surprising that the powertrains of electric cars differ quite a bit from traditional internal-combustion engines.
Although they have fewer moving parts, the rare-earth magnets that help power electric cars can be quite complex to fabricate.
So, what is there to know about rare-earth magnets—and how do automakers choose which kind of magnet is best for an electric car's motor?
First, there are four main types of magnets: ceramic (ferrite), AlNiCo, Samarium Cobalt (SmCo), and Neodymium (NdFeB).
The latter is the most common choice for automakers since it possesses the best properties for electric cars, as detailed in an informative feature at Charged EVs.
NdFeB magnets aren't the least expensive option, but they're stronger than the other three, and least resistant to corrosion.
With strength measurements, there are two key ways to place a figure on how powerful a magnet is: remanence and coercive force.