Servo motors usually wrap a three-pole rotor with a thin copper wire. When current flows through the coil, a magnetic field is generated, which repels the magnets around the rotor and generates a rotating force. According to the laws of physics, the moment of inertia of an object is proportional to its mass, so the greater the mass, the greater the force required to turn it. In order to find the servo with high speed and low energy consumption, the thin copper wire is then wound into a very thin hollow cylinder,