Rotating electrical machines are devices that convert electrical energy into mechanical energy or vice versa. They include two main types: electric motors, which transform electrical energy into motion, and generators, which convert mechanical energy into electrical energy. These machines operate based on electromagnetic principles, utilizing magnetic fields and coils of wire. The key components of rotating electrical machines are the stator and rotor. The stator is the stationary part that generates a magnetic field, while the rotor is the rotating part that interacts with this field. Together, they enable the efficient transfer of energy, making these machines essential in various applications, from household appliances to industrial equipment.