Why are copper coils commonly used in an induction motor stator?

In an induction motor, copper is the standard material for stator coils primarily due to its exceptional electrical properties. Copper is highly valued in electrical industries because it possesses high conductivity, which is essential for efficient energy transmission within the motor's windings.12

The stator coils are constructed using round conductors for smaller motors or rectangular bars for larger machines, both of which are electrically insulated to ensure proper operation. By utilizing high-conductivity copper, manufacturers can minimize resistance and optimize the performance of the electric motor. This choice of material aligns with the industry-wide adoption of the International Annealed Copper Standard, which serves as the benchmark for electrical conductivity in industrial applications.12