The core, which generates magnetic force as the most essential component of the motor, is wound with copper wire to supply electricity. It is crucial that the copper wire is inserted without damaging the enamel insulation (approximately 0.02mm thick) on its surface, ensuring high-quality products. Damage to the insulation can lead to various defects. Additionally, perfect insulation between the conductive part carrying electricity and the core frame, which does not conduct electricity, is essential to prevent electric shock incidents. There should also be no interference between the rotor and other parts of the casing during operation.