The role of voice coil

(1) When the voice coil in the magnetic gap of the speaker with a magnetic field strength of B is energized with a current I, the voice coil will receive an electrical force F=BLI (L is the length of the voice coil), and the direction of the force is determined by the left hand rule.The position of the voice coil in the speaker(2) After the force occurs, when the electromagnetic system including the voice coil cuts the magnetic induction line at speed V, it will generate an induced voltage BLV inside the voice coil, the direction of which conforms to the right hand rule and is in line with the original current direction. At this time, the voice coil is the initial actor and acceptor of damping

The function of a voice coil is to convert electrical signals into mechanical vibrations, producing sound. When an electrical signal is transmitted to the voice coil, it generates a magnetic field that interacts with the permanent magnet, producing mechanical vibration and driving the diaphragm to produce sound. The performance of the voice coil can affect the sound intensity characteristics, sound intensity level, impedance curve, distortion, transient characteristics, speaker parameters, sound quality, etc. of the speaker.