Vibration motor

Abstract

The invention provides a vibration motor which comprises a cover plate, a coil winding and a flexible circuit board which are fixed on one side of the cover plate, a magnetic steel assembly which is provided with a magnetic gap and is arranged at an interval with the cover plate, and elastic pieces which are respectively fixed on the cover plate and the magnetic steel assembly, and the coil winding is inserted and suspended in the magnetic gap. The coil winding is electrically connected with the flexible circuit board, the magnetic steel assembly is arranged opposite to the cover plate, and the magnetic steel assembly is elastically suspended on the cover plate through the elastic piece; the cover plate and the coil winding serve as one of a rotor and a stator of the vibration motor, the magnetic steel assembly serves as the other one of the rotor and the stator of the vibration motor, and the stator is used for driving the rotor to vibrate. The vibration motor is a direct-drive ultrathin motor, and the vibration motor is fast in response, strong in vibration sense, simple in structure and convenient to assemble, reduces production requirements and production cost, and is suitable for small-size and low-cost equipment.

Description

Technical Field

[0001] The present invention relates to the field of vibration technology, and in particular to a vibration motor. Background Art

[0002] The X-axis linear motor is a machine that converts other forms of energy into mechanical vibrations. It is mainly used to provide users with real vibration feedback when using touch screens, such as tablet touch screens, car touch screens, and laptop touch screens with vibration.

[0003] The X-axis linear motor in the related technology mainly includes a housing, a mover, a stator, an amplifier and a flexible circuit board with a control system.

[0004] Although the X-axis linear motor can provide users with real vibration feedback when using touch, it is large in size, complex in structure, cumbersome in assembly, and high in cost, and is not suitable for small and low-cost devices.

[0005] Therefore, it is necessary to provide a new vibration motor to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a new vibration motor to solve the problem that the X-axis linear motor in the related art is not suitable for small-volume and low-cost equipment.

[0007] In a first aspect, the present invention provides a vibration motor, comprising a cover plate, a coil winding fixed to one side of the cover plate, a magnetic steel component having a magnetic gap and arranged opposite to the cover plate, and an elastic member elastically connecting the magnetic steel component to the cover plate, wherein the coil winding is inserted and suspended in the magnetic gap; The cover plate and the coil winding serve as one of the mover and the stator of the vibration motor, the magnetic steel assembly serves as the other of the mover and the stator of the vibration motor, and the stator is used to drive the mover to vibrate.

[0008] Preferably, the magnetic steel assembly includes a lower clamping plate arranged opposite to the cover plate, a main magnetic steel stacked and fixed on the lower clamping plate close to the cover plate, and an auxiliary magnetic steel arranged around the main magnetic steel and spaced with the main magnetic steel to form the magnetic gap, and the auxiliary magnetic steel is stacked and fixed on the lower clamping plate.

[0009] Preferably, the magnetic steel assembly also includes a pole core stacked and fixed on a side of the main magnetic steel close to the cover plate.

[0010] Preferably, the elastic member, the lower clamping plate, the main magnetic steel, the auxiliary magnetic steel and the pole core are coaxially arranged.

[0011] Preferably, the cover plate includes a main body, a bent portion formed by bending and extending the edge of the main body toward a side close to the magnetic steel assembly, a fixed portion formed by protruding and extending outward from the edge of the main body, a through hole penetrating the middle area of ​​the main body, and an elongated extension hole penetrating the main body, the bent portion and the fixed portion in sequence, wherein the extension hole is connected to the through hole; the vibration motor also includes a flexible circuit board, which is fixed to a side of the fixed portion close to the magnetic steel assembly, the coil winding is arranged around the through hole and fixed to a side of the main body close to the magnetic steel assembly, and both ends of the coil winding extend from the extension hole to the flexible circuit board and form a fixed electrical connection with the flexible circuit board.

[0012] Preferably, the elastic member includes a first fixed arm fixed to the bending portion on one side close to the magnetic steel assembly, a second fixed arm fixed to the magnetic steel assembly on one side close to the cover plate, and an elastic arm extending from the first fixed arm to the second fixed arm.

[0013] Preferably, the coil winding is in a ring shape, the main magnetic steel is circular, and the auxiliary magnetic steel is in a ring shape.

[0014] Preferably, the coil winding is in a square ring shape, the main magnetic steel is in a square shape, and the auxiliary magnetic steel is in a square ring shape.

[0015] Preferably, the magnetic steel assembly has at least two magnetic gaps distributed from the inside to the outside, the number of the coil windings is the same as the number of the magnetic gaps, and each of the coil windings is inserted and suspended in one of the magnetic gaps.

[0016] Preferably, the magnetic steel assembly includes a lower clamping plate arranged opposite to the cover plate, a main magnetic steel stacked and fixed on the lower clamping plate close to the cover plate, a secondary magnetic steel arranged around the main magnetic steel and spaced from the main magnetic steel, and a first secondary magnetic steel arranged around the secondary magnetic steel and spaced from the secondary magnetic steel, the secondary magnetic steel and the first secondary magnetic steel are both stacked and fixed on the lower clamping plate, the secondary magnetic steel and the main magnetic steel are spaced to form a first magnetic gap, and the first secondary magnetic steel and the secondary magnetic steel are spaced to form a second magnetic gap; the two coil windings are respectively inserted in the two magnetic gaps.

[0017] Compared with the related art, the vibration motor in the present invention can form a direct-drive ultra-thin motor by setting a cover plate, a coil winding fixed to the cover plate, a magnetic steel assembly having a magnetic gap and arranged opposite to the cover plate, and an elastic part that elastically connects the magnetic steel assembly to the cover plate. The vibration motor has fast response, strong vibration sensation, simple structure, and easy assembly, which reduces production requirements and production costs and is suitable for small-volume and low-cost equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 A schematic diagram of the three-dimensional structure of a first vibration motor provided by an embodiment of the present invention; Figure 2 A schematic diagram of partial structural decomposition of a first vibration motor provided by an embodiment of the present invention; Figure 3 For along Figure 1 The cross-section diagram of the AA line; Figure 4 A schematic diagram of the state of the cover plate and the coil winding in the first vibration motor provided by an embodiment of the present invention when they are used as a stator; Figure 5 A schematic diagram of the state of the cover plate and the coil winding in the first vibration motor provided by an embodiment of the present invention when they are used as a mover; Figure 6 A schematic diagram of a magnetic steel assembly in a first vibration motor provided by an embodiment of the present invention; Figure 7 A layout diagram of the coil winding and the magnetic steel assembly in the second vibration motor provided by an embodiment of the present invention; Figure 8 A layout diagram of coil windings and magnetic steel components in a third vibration motor provided in an embodiment of the present invention.

[0019] Among them, 100, vibration motor; 1, cover plate; 11, main body; 12, bending part; 13, fixing part; 14, through hole; 15, extension hole; 2, coil winding; 3, flexible circuit board; 4, magnetic steel assembly; 41, lower clamping plate; 42, main magnetic steel; 43, auxiliary magnetic steel; 44, pole core; 45, first auxiliary magnetic steel; 5, elastic member; 51, first fixed arm; 52, second fixed arm; 53, elastic arm; 10, magnetic gap. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1 The embodiment of the present invention provides a vibration motor 100, Figures 1 to 3 As shown, it includes a cover plate 1, a coil winding 2 fixed to one side of the cover plate 1, a magnetic steel assembly 4 having a magnetic gap 10 and arranged opposite to the cover plate 1, and an elastic member 5 elastically connecting the magnetic steel assembly 4 to the cover plate 1, and the coil winding 2 is inserted and suspended in the magnetic gap 10.

[0022] Among them, Figure 4 As shown, if the cover plate 1 is used as a fixed component, the cover plate 1 and the coil winding 2 are used as the stator of the vibration motor 100, and accordingly, the magnetic steel assembly 4 is used as the mover of the vibration motor 100, and the stator is used to drive the mover to vibrate. Figure 5 As shown, if the magnetic steel assembly 4 is used as a fixed component, the magnetic steel assembly 4 is used as a stator of the vibration motor 100 , and the cover plate 1 and the coil winding 2 are used as a mover of the vibration motor 100 .

[0023] The cover plate 1 is a non-magnetic cover plate 1 , the elastic member 5 is a magnetic elastic member or a non-magnetic elastic member, the lower clamping plate 41 is a strong magnetic lower clamping plate 41 , and the pole core 44 is a strong magnetic pole core 44 .

[0024] The cover plate 1 includes a main body 11, a bent portion 12 formed by bending and extending the edge of the main body 11 toward a side close to the magnetic steel assembly 4, a fixing portion 13 formed by protruding and extending outward from the edge of the main body 11, a through hole 14 penetrating the middle area of ​​the main body 11, and an elongated extension hole 15 penetrating the main body 11, the bent portion 12 and the fixing portion 13, and the extension hole 15 is connected to the through hole 14.

[0025] The vibration motor 100 also includes a flexible circuit board 3, which is fixed to one side of the fixed portion 13 close to the magnetic steel assembly 4. The coil winding 2 is arranged around the through hole 14 and fixed to one side of the main body 11 close to the magnetic steel assembly 4. Both ends of the coil winding 2 extend from the extension hole 15 to the flexible circuit board 3 and form a fixed electrical connection with the flexible circuit board 3.

[0026] The magnetic steel assembly 4 includes a lower clamping plate 41 which is arranged opposite to the cover plate 1, a main magnetic steel 42 which is stacked and fixed on the side of the lower clamping plate 41 close to the cover plate 1, and an auxiliary magnetic steel 43 which is arranged around the main magnetic steel 42 and is spaced from the main magnetic steel 42 to form a magnetic gap 10. The auxiliary magnetic steel 43 is stacked and fixed on the lower clamping plate 41.

[0027] The magnetic steel assembly 4 further includes a pole core 44 which is stacked and fixed on a side of the main magnetic steel 42 close to the cover plate 1. This design can further enhance the magnetic field strength of the magnetic steel assembly 4.

[0028] In this embodiment, the lower clamping plate 41, the main magnet 42, and the pole core 44 are all circular, and the auxiliary magnet 43 is in the shape of a circular ring; the elastic member 5, the lower clamping plate 41, the main magnet 42, the auxiliary magnet 43, and the pole core 44 are coaxially arranged; correspondingly, the coil winding 2 is a circular ring-shaped coil, and the coil winding 2 and the lower clamping plate 41 are also coaxially arranged; at this time, the coil winding 2 and the magnet assembly 4 are circularly arranged.

[0029] The elastic member 5 includes a first fixing arm 51 fixed to one side of the bending portion 12 close to the magnet assembly 4, a second fixing arm 52 fixed to one side of the auxiliary magnet 43 close to the cover plate 1, and an elastic arm 53 connecting the first fixing arm 51 and the second fixing arm 52; the elastic member 5 forms a single circular planar spring structure; in this embodiment, the elastic arm 53 includes three arranged at equal intervals. Of course, according to actual requirements, the elastic member 5 can also be an elastic structure such as a double-arc planar elastic piece, a double-square planar elastic piece, or a single circular three-dimensional spring.

[0030] The pole core 44 is fixed to the main magnet 42 by means of bonding or the like, the spring is fixed to the auxiliary magnet 43 by means of bonding or the like, and the auxiliary magnet 43 is fixed to the lower clamping plate 41 by means of bonding or the like.

[0031] Combined Figures 4 to 6 As shown, the mover is subjected to a reverse Ampere force, and the direction is from the magnet assembly 4 towards the cover plate 1; when a reverse current is passed through the coil winding 2, the force direction of the mover is from the cover plate 1 towards the magnet assembly 4; when a periodic current is passed through the coil winding 2, the stator will generate a periodic electromagnetic resultant force on the mover, and this resultant force serves as an excitation source to drive the vibration motor 100 composed of the stator, the mover, and the elastic member 5 to vibrate.

[0032] Compared with the related art, the vibration motor 100 in this embodiment forms a direct-drive ultra-thin motor by arranging the cover plate 1, the coil winding 2 fixed to the cover plate 1, the magnet assembly 4 having a magnetic gap 10 and arranged opposite to the cover plate 1 at an interval, and the elastic member 5 elastically connecting the magnet assembly 4 to the cover plate 1. Moreover, the vibration motor 100 has a fast response, a strong vibration feeling, a simple structure, convenient assembly, reduces the production requirements and production costs, and is suitable for small-volume and low-cost devices.

[0033] Embodiment Two The difference between this embodiment and the above Embodiment One is that, as Figure 7 shown, the lower clamping plate 41, the main magnet 42, and the pole core 44 are all square, and the auxiliary magnet 43 is in the shape of a square ring; correspondingly, the coil winding 2 is a square ring-shaped coil; at this time, the coil winding 2 and the magnet assembly 4 are both square arranged.

[0034] Embodiment Three The difference between this embodiment and the above Embodiment One is that, as Figure 8As shown, the magnetic steel assembly 4 includes a lower clamping plate 41 spaced opposite to the cover plate 1, a main magnetic steel 42 stacked and fixed on the side of the lower clamping plate 41 close to the cover plate 1, a secondary magnetic steel 43 arranged around the main magnetic steel 42 and spaced from the main magnetic steel 42, and a first secondary magnetic steel 45 arranged around the secondary magnetic steel 43 and spaced from the secondary magnetic steel 43. The secondary magnetic steel 43 and the first secondary magnetic steel 45 are both stacked and fixed on the lower clamping plate 41. The secondary magnetic steel 43 and the main magnetic steel 42 are spaced to form a first magnetic gap 10, and the first secondary magnetic steel 45 and the secondary magnetic steel 43 are spaced to form a second magnetic gap 10; the two coil windings 2 are respectively inserted in the two magnetic gaps 10; correspondingly, the coil windings 2 include two, each coil winding 2 is inserted and suspended in one magnetic gap 10. The magnetic steel assembly 4 and the coil winding 2 form a three-magnet two-coil winding magnetic circuit.

[0035] Of course, according to actual needs, the magnetic steel assembly 4 has a plurality of magnetic gaps 10 distributed from the inside to the outside, the number of coil windings 2 is the same as the number of magnetic gaps 10, and each coil winding 2 is inserted and suspended in a magnetic gap 10. That is, the magnetic steel assembly 4 and the coil winding 2 can also form a magnetic circuit structure of four magnetic steels and three coil windings, five magnetic steels and four coil windings, etc.

[0036] Embodiment 4 This embodiment provides an electronic device, which includes the vibration motor 100 in any one of the above embodiments 1 to 3. The electronic device can be a touch screen of a notebook computer, a touch screen of a car, a touch screen of a tablet, or a touch screen of other related devices.

[0037] Since the electronic device in this embodiment includes the vibration motor 100 in any one of the above-mentioned embodiments 1 to 3, it can also achieve the technical effects achieved by the vibration motor 100 in any one of the above-mentioned embodiments 1 to 3, which will not be elaborated here.

[0038] The above are merely embodiments of the present invention. It should be pointed out that, for those skilled in the art, improvements can be made without departing from the creative concept of the present invention, but these all fall within the protection scope of the present invention.

Claims

1. A vibration motor, characterized in that: The vibration motor comprises a cover plate, a coil winding fixed to one side of the cover plate, a magnetic steel component having a magnetic gap and arranged opposite to the cover plate, and an elastic member elastically connecting the magnetic steel component to the cover plate, and the coil winding is inserted and suspended in the magnetic gap; The cover plate and the coil winding serve as one of the mover and the stator of the vibration motor, the magnetic steel assembly serves as the other of the mover and the stator of the vibration motor, and the stator is used to drive the mover to vibrate.

2. The vibration motor according to claim 1, wherein: The magnetic steel assembly includes a lower clamping plate arranged opposite to the cover plate, a main magnetic steel stacked and fixed on the side of the lower clamping plate close to the cover plate, and an auxiliary magnetic steel arranged around the main magnetic steel and spaced with the main magnetic steel to form the magnetic gap, and the auxiliary magnetic steel is stacked and fixed on the lower clamping plate.

3. The vibration motor according to claim 2, characterized in that The magnetic steel assembly also includes a pole core stacked and fixed on a side of the main magnetic steel close to the cover plate.

4. The vibration motor according to claim 3, characterized in that The elastic member, the lower clamping plate, the main magnetic steel, the auxiliary magnetic steel and the pole core are coaxially arranged.

5. The vibration motor according to claim 1, wherein: The cover plate includes a main body, a bent portion formed by bending and extending the edge of the main body toward a side close to the magnetic steel assembly, a fixed portion formed by protruding and extending the edge of the main body outward, a through hole penetrating the middle area of ​​the main body, and an elongated extension hole penetrating the main body, the bent portion and the fixed portion in sequence, wherein the extension hole is connected to the through hole; the vibration motor also includes a flexible circuit board, which is fixed to a side of the fixed portion close to the magnetic steel assembly, the coil winding is arranged around the through hole and fixed to a side of the main body close to the magnetic steel assembly, and both ends of the coil winding extend from the extension hole to the flexible circuit board and form a fixed electrical connection with the flexible circuit board.

6. The vibration motor according to claim 5, characterized in that The elastic member includes a first fixed arm fixed to a side of the bending portion close to the magnetic steel assembly, a second fixed arm fixed to a side of the magnetic steel assembly close to the cover plate, and an elastic arm connecting the first fixed arm and the second fixed arm.

7. The vibration motor according to claim 2, wherein: The coil winding is in a ring shape, the main magnetic steel is in a circle, and the auxiliary magnetic steel is in a ring shape.

8. The vibration motor according to claim 2, wherein: The coil winding is in a square ring shape, the main magnetic steel is in a square shape, and the auxiliary magnetic steel is in a square ring shape.

9. The vibration motor according to claim 1, wherein: The magnetic steel component has at least two magnetic gaps distributed from the inside to the outside, the number of the coil windings is the same as the number of the magnetic gaps, and each of the coil windings is inserted and suspended in one of the magnetic gaps.

10. The vibration motor according to claim 9, characterized in that The magnetic steel assembly includes a lower clamping plate arranged opposite to the cover plate, a main magnetic steel stacked and fixed on the lower clamping plate close to the cover plate, an auxiliary magnetic steel arranged around the main magnetic steel and spaced from the main magnetic steel, and a first auxiliary magnetic steel arranged around the auxiliary magnetic steel and spaced from the auxiliary magnetic steel. The auxiliary magnetic steel and the first auxiliary magnetic steel are both stacked and fixed on the lower clamping plate, the auxiliary magnetic steel and the main magnetic steel are spaced to form a first magnetic gap, and the first auxiliary magnetic steel and the auxiliary magnetic steel are spaced to form a second magnetic gap; the two coil windings are respectively inserted in the two magnetic gaps.

Images