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Neodymium, praseodymium, dysprosium, and terbium, are used in electric motor magnets, but in different ways:

Neodymium: This is the main ingredient in neodymium magnets (NdFeB), the most common type of permanent magnet used in electric motors. These magnets offer a strong magnetic field in a small package, making them efficient and lightweight.

Praseodymium: Often added to neodymium magnets in small amounts to improve corrosion resistance without significantly affecting magnetic performance.

Dysprosium and Terbium: These are heavy rare earths added to neodymium magnets to enhance their high-temperature performance. They increase the coercivity, meaning the magnet's ability to resist demagnetization at high temperatures, which is crucial for electric motors in applications like electric vehicles that generate significant heat.

Neodymium: Main ingredient, providing strong magnetic field
Praseodymium: Improves corrosion resistance (small amounts)
Dysprosium: Enhances high-temperature performance (small amounts)
Terbium: Enhances high-temperature performance (small amounts)

It's important to note that while all four elements play a role, neodymium is the essential component found in all neodymium magnets, while the others are added in smaller quantities for specific functionalities.