Linear motors and electronic devices

Abstract

This application discloses a linear motor and an electronic device. The linear motor includes an upper shell, a lower shell, a mover assembly, a stator assembly, and a heat sink. The upper and lower shells surround and form a receiving cavity. The mover assembly and the stator assembly are disposed within the receiving cavity. The stator assembly includes an iron core, a coil sleeved on the iron core, and pole shoes located on both sides of the coil. The heat sink is injection molded on the lower shell and is also injection molded on the circumferential outer side of the coil and on the outer side of the shaft ends of the pole shoes located at both ends of the iron core. The circumferential outer side of the pole shoes protrudes from the heat sink. This linear motor increases the contact area between the heat sink and the coil by using a heat sink injection molded on the circumferential outer side of the coil and connected to the lower shell, thereby improving the heat dissipation performance and overall performance of the linear motor.

Claims

1. A linear motor, comprising: An upper shell and a lower shell surround and form a receiving cavity; a moving part assembly is disposed within the receiving cavity; a stator assembly is disposed within the receiving cavity, the stator assembly including a coil, an iron core, and a pole shoe, at least one coil and the pole shoe located on both sides of the coil are sleeved on the iron core; a heat sink is injection molded on the lower shell and injection molded on the circumferential outer side of the coil and the axial outer side of the pole shoe located at both ends of the iron core, the circumferential outer side of the pole shoe protruding from the heat sink.

2. The linear motor as described in claim 1, wherein, The upper shell is provided with a first heat dissipation hole, and the lower shell is provided with a second heat dissipation hole. The positions of the first heat dissipation hole and the second heat dissipation hole correspond to the positions of the coil.

3. The linear motor as described in claim 2, wherein, The linear motor also includes a top sealing film and a bottom sealing film. The top sealing film is adhered to the outer surface of the upper housing and covers the first heat dissipation hole, and the bottom sealing film is adhered to the outer surface of the lower housing and covers the second heat dissipation hole.

4. The linear motor as claimed in claim 1, wherein, The mover assembly includes a through hole, the stator assembly is located within the through hole, and the mover assembly reciprocates relative to the stator assembly along the length direction of the mover assembly.

5. The linear motor as claimed in claim 4, wherein, The moving part assembly includes: a vibrator with the through hole, the stator assembly being housed within the through hole; two sets of magnets disposed within the through hole and located opposite each other on both sides of the stator assembly in the width direction; and two elastic members disposed on both sides of the vibrator in the length direction, the two elastic members having opposite opening directions.

6. The linear motor as claimed in claim 5, wherein, The mover assembly also includes two magnetic plates disposed within the through hole and located opposite each other on both sides of the stator assembly in the width direction, with each magnetic plate disposed between the corresponding magnet and the side wall of the through hole.

7. The linear motor as described in claim 4 or 5, wherein, The linear motor also includes two damping elements, which are respectively disposed on the two side walls of the through hole in the length direction or at both ends of the stator assembly in the length direction.

8. The linear motor as claimed in claim 5, wherein, The elastic element is mounted on the oscillator via a first positioning piece, and the elastic element is also mounted inside the upper shell via a second positioning piece.

9. The linear motor as claimed in claim 1, wherein, The linear motor also includes a circuit board, part of which is located on the lower housing and electrically connected to the stator assembly, and part of which is located on the outer surface of the upper housing and connected to an external control circuit.

10. The linear motor as claimed in claim 1, wherein, The linear motor also includes a connecting lug that is fixed to the outside of the upper housing.

11. The linear motor as claimed in claim 9, wherein, The linear motor also includes a Hall sensor and a magnet paired with the Hall sensor. The magnet is fixed to the outer wall of the actuator assembly, and the Hall sensor is fixed to the circuit board and positioned opposite to the magnet.

12. An electronic device comprising a housing, a control circuit board, and a linear motor as claimed in any one of claims 1 to 11, wherein the control circuit board and the linear motor are disposed within the housing, and the control circuit board is electrically connected to the linear motor.

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