Vibration motor with a closed-loop magnetic circuit

1 . A vibration motor with closed-loop magnetic circuit, comprising a motor body, which further comprising:

a stator fixed seat, further comprising:

a coil group, disposed inside the stator fixed seat;

a stator yoke, made of magnetically permeable material, connected to the stator fixed seat, and disposed on one side of the coil group; and

a flexible circuit board, electrically connected to the coil group to supply and distribute current to the coil group;

a mover, disposed on the other side of the coil group relative to the stator yoke, and further comprising:

a mover carrier, connected to the stator fixed seat through a suspension device;

a magnet, connected to the mover carrier, a side of the magnet near the coil group forming a magnet surface; and

a mover yoke, disposed on the side of the mover carrier away from the coil group; and

the suspension device, further comprising: an elastic support element, with one end connected to the mover carrier to enable the mover to move back- and forth with respect to the stator fixed seat; and

a fixed element, fixedly connected to the other end of the elastic support element and the stator fixed seat, and forming a gap between the mover and the coil group;

wherein the flexible circuit board provides a current to the coil group, and cooperates with a magnetic field of the mover generated by the magnet to form an electromagnetic thrust to move the mover; and

wherein the stator yoke forms a stator yoke projection surface on the magnet surface of the corresponding magnet, and the area of the stator yoke projection surface is smaller than the area of the corresponding magnet surface.

2 . The vibration motor with closed-loop magnetic circuit according to claim 1 , wherein the stator yoke projection surface can be located inside the magnet surface of the corresponding magnet.

3 . The vibration motor with closed-loop magnetic circuit according to claim 2 , wherein the geometric center of the stator yoke projection surface overlaps the geometric center of the magnet surface to reduce the suction force between the stator yoke and the magnet.

4 . The vibration motor with closed-loop magnetic circuit according to claim 1 , wherein a plurality of magnets is disposed, the magnets are arranged in the same direction, and the adjacent magnet surfaces have opposite magnetic poles.

5 . The vibration motor with closed-loop magnetic circuit according to claim 4 , wherein the adjacent magnets are not in contact with each other.

6 . The vibration motor with closed-loop magnetic circuit according to claim 5 , wherein the magnetization direction of the magnet is perpendicular to the magnet surface.

7 . The vibration motor with closed-loop magnetic circuit according to claim 5 , wherein the elastic support element can be a flat strip spring.

8 . The vibration motor with closed-loop magnetic circuit according to claim 5 , wherein the flexible circuit board has an electronic control processing unit for receiving external signals and adjusting the magnitude and flow direction of the current.