Vibration unit, speaker and manufacturing method of the vibration unit

A vibration unit, comprising a shell with a hollow cavity and a vibration shaft arranged in the hollow cavity;

• wherein the shell is provided with two elastic support structures located at two ends of the vibration shaft, and at least two permanent magnet rings and at least one magnetic insulator ring are fixed to an outer periphery of the vibration shaft, with each magnetic insulator ring arranged between every two adjacent permanent magnet rings;
• and further comprising coils fixed on an inner wall of the hollow cavity and located on an outer periphery of each of the permanent magnet rings, wherein a change in a current flowing through each of the coils causes magnetic field force at two ends of each of the permanent magnet rings to change, so as to produce vibration of each of the permanent magnet rings in proportion to the change in the current, which in turn drives the vibration shaft to vibrate in proportion.