Which metal is most likely used for an electrical motor shaft?

The most likely metal used for an electrical motor shaft is steel. Steel is chosen for its high strength, durability, and resistance to wear, making it ideal for applications where a robust component is necessary. The motor shaft must be able to transmit torque and withstand stresses during operation, and steel's properties allow it to perform these functions effectively.

In contrast, while aluminum is lightweight and has good corrosion resistance, it does not possess the same level of tensile strength as steel, which may limit its effectiveness in high-stress environments like those found in motor applications. Copper is an excellent conductor of electricity and is commonly used in windings and electrical connections but lacks the necessary structural properties to serve as a shaft. Brass, though it has good mechanical properties and corrosion resistance, is typically used in applications requiring good machinability or electrical conductivity rather than the high strength and rigidity needed for a motor shaft. Therefore, steel stands out as the most suitable material for this purpose, ideally matching the requirements for functionality and durability in an electrical motor.