Vibration motor

Abstract

The invention provides a vibration motor. The vibration motor comprises a stator, an elastic piece and a rotor which vibrates along a first direction, the stator comprises a shell with an accommodating space and a magnetic steel assembly accommodated in the accommodating space, the magnetic steel assembly comprises two first magnetic steels and two second magnetic steels, the two first magnetic steels are arranged at intervals in a second direction and are symmetrically fixed on the shell, and the two second magnetic steels are arranged at intervals in a third direction and are symmetrically fixed on the shell; the first direction, the second direction and the third direction are vertical in pairs; the two ends, in the first direction, of the mover are suspended in the containing space through elastic pieces respectively, the mover comprises an iron core unit and a winding, the iron core unit comprises a first iron core, a second iron core and a third iron core, the second iron core and the third iron core are symmetrically fixed to the two ends, in the first direction, of the first iron core, and the winding is wound outside the first iron core and located between the second iron core and the third iron core. The vibration motor is simple in structure, small in size and easy to assemble, and production cost and production requirements are reduced.

Description

Technical Field

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

[0002] In the prior art, the more common vibration device is the X-axis linear motor, which is not only large in size, but also complex in structure, complicated in assembly, and high in production cost. It is difficult to be used in some occasions that have high requirements on both cost and performance.

[0003] Therefore, it is necessary to provide a vibration motor with small size, simple structure and easy assembly. Summary of the invention

[0004] The object of the present invention is to provide a vibration motor to solve the technical problems in the prior art that the vibration device is large in size, complex in structure and complicated in assembly.

[0005] The technical solution of the present invention is as follows: The present invention provides a vibration motor, comprising: a stator, an elastic member and a mover vibrating along a first direction; The stator comprises a shell having a receiving space, and a magnetic steel assembly received in the receiving space, wherein the magnetic steel assembly comprises two first magnetic steels and two second magnetic steels, wherein the two first magnetic steels are spaced apart in a second direction and symmetrically fixed to the shell, and the two second magnetic steels are spaced apart in a third direction and symmetrically fixed to the shell, and the first direction, the second direction and the third direction are perpendicular to each other; The two ends of the mover in the first direction are suspended in the accommodating space by the elastic members respectively. The mover includes a core unit and a winding. The core unit includes a first core, and a second core and a third core symmetrically fixed to the two ends of the first core in the first direction. The winding is wound outside the first core and located between the second core and the third core.

[0006] Preferably, the winding is arranged around the first direction; The two first magnetic steels are magnetized along the second direction respectively and the magnetization directions of the two are opposite, the first magnetic steel comprises a first magnetization region and a second magnetization region symmetrically arranged at two ends of the first magnetization region in the first direction, and the magnetization direction of the second magnetization region is opposite to the magnetization direction of the first magnetization region; The two second magnetic steels are magnetized along the third direction respectively and the magnetization directions of the two are opposite.

[0007] Preferably, the second magnetic steel includes a third magnetizing region and fourth magnetizing regions symmetrically arranged at two ends of the third magnetizing region in the first direction, and the magnetizing direction of the fourth magnetizing region is opposite to that of the third magnetizing region.

[0008] Preferably, the shell is a hollow structure with two openings, the two openings are arranged opposite to each other in the first direction, and the hollow part of the shell is configured as the receiving space; The vibration motor includes two elastic members, which are arranged in one-to-one correspondence with the openings. Two opposite ends of the elastic members are respectively fixed to the housing so that each elastic member is respectively arranged across the corresponding opening.

[0009] Preferably, the length of the shell in the second direction is smaller than the length of the shell in the third direction, the shell comprises two first surfaces spaced apart in the second direction and two second surfaces spaced apart in the third direction, and the two first surfaces and the two second surfaces enclose the receiving space; The first magnetic steel is fixed to the first surface; There is a gap between the second magnetic steel and the second surface; The elastic member is respectively fixed to the housing at two ends in the third direction.

[0010] Preferably, the stator further comprises two pole cores accommodated in the accommodation space, the two pole cores are spaced apart in the third direction and symmetrically fixed to the housing, and there is a gap between the pole cores and the second surface; The two second magnetic steels are disposed between the two pole cores and are respectively fixed to the corresponding pole cores.

[0011] Preferably, the elastic member is provided with a through hole; The first core includes a first core body, a first protrusion extending from the first core body along the first direction toward the second core and connected to the second core, and a second protrusion extending from the first core body along the first direction toward the third core and connected to the third core, the first protrusion and the second protrusion are symmetrically arranged in the first direction, and the first protrusion and the second protrusion are respectively inserted into the through holes of the corresponding elastic members.

[0012] Preferably, the second iron core is provided with a first plugging hole plug-matched with the first protrusion, and the third iron core is provided with a second plugging hole plug-matched with the second protrusion.

[0013] Preferably, at least one of the first core, the second core and the third core is formed by laminating multiple layers of iron sheets.

[0014] The beneficial effects of the present invention are as follows: the vibration motor of the present invention comprises a stator, an elastic member and a mover vibrating along a first direction; the stator comprises a shell having a receiving space, and a magnetic steel assembly received in the receiving space, the magnetic steel assembly comprises two first magnetic steels and two second magnetic steels, wherein the two first magnetic steels are arranged at intervals in the second direction and symmetrically fixed to the shell, the two second magnetic steels are arranged at intervals in the third direction and symmetrically fixed to the shell, and the first direction, the second direction and the third direction are perpendicular to each other; the mover is suspended in the receiving space at both ends of the first direction by elastic members, and the mover comprises an iron core unit and a winding The core unit includes a first core, and a second core and a third core symmetrically fixed at both ends of the first core in the first direction, and the winding is wound outside the first core and located between the second core and the third core; it not only has a simple structure and a small volume, is easy to assemble, reduces production requirements and production costs, but also has a high space utilization rate, and can provide a stronger vibration experience in a smaller volume; when a periodic current is passed through the winding, the mover is subjected to a periodic electromagnetic force, and this force acts as an excitation source to drive the direct-drive vibration system composed of the mover, stator and elastic member to vibrate, with a fast response and a more realistic vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the vibration motor of the present invention.

[0016] Figure 2 for Figure 1 Schematic diagram of the partial structure of the vibration motor shown.

[0017] Figure 3 for Figure 1 Exploded view of the vibration motor shown.

[0018] Figure 4 for Figure 1 A top view of the vibration motor is shown.

[0019] Figure 5 for Figure 4 Enlarged view of the AA cross-section structure.

[0020] Figure 6 for Figure 4 Enlarged view of the BB cross-section structure.

[0021] Figure 7 for Figure 1 A schematic diagram of the magnetization direction of the first magnetic steel in the vibration motor is shown.

[0022] Figure 8 for Figure 1 A schematic diagram of a first magnetizing direction of the second magnetic steel in a vibration motor is shown.

[0023] Fig. 9for Figure 1 Schematic diagram of the second magnetizing direction of the second magnetic steel in the vibration motor shown.

[0024] Fig.10 for Figure 1 Schematic diagram of the stator structure in the vibration motor shown.

[0025] Fig.11 It is a schematic diagram of the structure of the mover in the vibration motor of the present invention.

[0026] Fig.12 for Fig.11 The exploded diagram of the core unit in the mover is shown.

[0027] Fig.13 This is an exploded view of the first structure of the housing in the vibration motor of the present invention.

[0028] Fig.14 This is an exploded view of the second structure of the housing in the vibration motor of the present invention.

[0029] Wherein: 1-stator (11-housing (111-accommodating space, 112-opening, 113-first surface, 114-second surface, 115-shell (1151-first plate, 1152-second plate), 116-third plate, 117-fourth plate), 12-magnetic steel assembly (121-first magnetic steel (1211-first magnetizing area, 1212-second magnetizing area), 122-second magnetic steel (1221-third magnetizing area, 1222-fourth magnetizing area)), 13-pole core), 2 -elastic member (21-through hole), 3-mover (31-core unit (311-first core (3111-first core body, 3112-first convex portion, 3113-second convex portion), 312-second core (3121-first plug hole), 313-third core (3131-second plug hole)), 32-winding), a-first magnetic circuit, b-second magnetic circuit, c-third magnetic circuit, d-fourth magnetic circuit, e-fifth magnetic circuit, f-sixth magnetic circuit, g-seventh magnetic circuit, h-eighth magnetic circuit. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0031] The embodiment of the present invention provides a vibration motor, comprising a stator 1, an elastic member 2 and a mover 3 vibrating along a first direction, Figures 1 to 6. The stator 1 includes a shell 11 and a magnetic steel assembly 12, the shell 11 has a receiving space 111, and the magnetic steel assembly 12 is received in the receiving space 111. The magnetic steel assembly 12 includes two first magnetic steels 121 and two second magnetic steels 122, wherein the two first magnetic steels 121 are spaced apart in the second direction and symmetrically fixed to the shell 11, and the two second magnetic steels 122 are spaced apart in the third direction and symmetrically fixed to the shell 11. Among them, the first direction, the second direction and the third direction are perpendicular to each other. The two ends of the mover 3 in the first direction are suspended in the receiving space 111 by elastic members 2 respectively, and the mover 3 includes a core unit 31 and a winding 32, the core unit 31 includes a first core 311, a second core 312 and a third core 313, and the second core 312 and the third core 313 are symmetrically fixed to the two ends of the first core 311 in the first direction. The winding 32 is wound outside the first core 311 , and is located between the second core 312 and the third core 313 .

[0032] The vibration motor of the embodiment of the present invention comprises a mover 3, a stator 1 and an elastic member 2 vibrating along a first direction, the stator 1 comprises a housing 11 having a receiving space 111, and a magnetic steel assembly 12 received in the receiving space 111, the magnetic steel assembly 12 comprises two first magnetic steels 121 and two second magnetic steels 122, wherein the two first magnetic steels 121 are arranged at intervals in the second direction and are symmetrically fixed to the housing 11, the two second magnetic steels 122 are arranged at intervals in the third direction and are symmetrically fixed to the housing 11, and the mover 3 is suspended in the receiving space 11 at both ends of the first direction by the elastic member 2 1, the mover 3 includes an iron core unit 31 and a winding 32. The iron core unit 31 includes a first iron core 311, and a second iron core 312 and a third iron core 313 symmetrically fixed to the two ends of the first iron core 311 in the first direction. The winding 32 is wound outside the first iron core 311 and is located between the second iron core 312 and the third iron core 313. It not only has a simple structure and low production cost, but is also easy to assemble, further reducing production requirements and production costs. In addition, the vibration motor of the embodiment of the present invention has a small volume and high space utilization, and can provide a stronger vibration experience in a smaller volume. When a periodic current is passed through the winding 32, the mover 3 is subjected to a periodic electromagnetic force. This force acts as an excitation source to drive the direct-drive vibration system composed of the mover 3, the stator 1 and the elastic member 2 to vibrate, with a fast response and a more realistic vibration.

[0033] The vibration motor of the embodiment of the present invention has a simple structure and low cost, and the appearance of the vibration motor can be made into Figure 1 The vibration motor of the embodiment of the present invention has strong performance and can provide great vibration in a small size, and can be applied to automobile steering wheels, central control, notebooks or other related fields.

[0034] As an example, the first direction may be a Z direction, and the vibration motor in the embodiment of the present invention may be a Z-axis linear motor.

[0035] In some preferred embodiments, please refer to Figure 3 , the winding 32 is arranged around the first direction. Please refer to Figure 5 The two first magnetic steels 121 are magnetized along the second direction respectively, and the magnetization directions of the two first magnetic steels 121 are opposite. Figure 7 , the first magnetic steel 121 includes a first magnetizing region 1211 and two second magnetizing regions 1212, the two second magnetizing regions 1212 are symmetrically arranged at both ends of the first magnetizing region 1211 in the first direction, and the magnetizing direction of the second magnetizing region 1212 is opposite to the magnetizing direction of the first magnetizing region 1211. Specifically, the first magnetizing regions 1211 of the two first magnetic steels 121 are arranged correspondingly, and the magnetizing directions of the two first magnetizing regions 1211 are opposite. The second magnetizing regions 1212 of the two first magnetic steels 121 are arranged one by one, and the magnetizing directions of the two corresponding second magnetizing regions 1212 are opposite. Please refer to Figure 8 As shown, the two second magnetic steels 122 are magnetized along the third direction respectively, and the magnetization directions of the two second magnetic steels 122 are opposite.

[0036] In this embodiment, the excitation principle and magnetic circuit of the winding 32 and the magnetic steel assembly 12 are as follows: Figures 4 to 6 As shown, in Figures 4 to 6 Under the excitation in the direction shown, the vibration system can at least form the first magnetic circuit a, the second magnetic circuit b, the third magnetic circuit c, the fourth magnetic circuit d, the fifth magnetic circuit e, the sixth magnetic circuit f, the seventh magnetic circuit g and the eighth magnetic circuit h. Figures 4 to 6 Under the excitation in the direction shown, the mover 3 is acted upon by the electromagnetic force and the Ampere force, and the resultant force F is directed downward. It can be understood that when the winding 32 is connected to Figure 5 and Figure 6 When the current is in the opposite direction as shown, the direction of the resultant force on the mover 3 is upward. When the winding 32 is supplied with periodic current, the stator 1 will generate a periodic electromagnetic resultant force on the mover 3, and this resultant force acts as an excitation source to drive the vibration system composed of the stator 1, the mover 3 and the spring to vibrate.

[0037] In other preferred embodiments, please refer to Fig. 9 As shown, the magnetization direction of the second magnetic steel 122 is Figure 6 and Figure 8In the illustrated embodiment, the magnetizing direction of the second magnetic steel 122 is different. Specifically, the second magnetic steel 122 includes a third magnetizing region 1221 and two fourth magnetizing regions 1222, the two fourth magnetizing regions 1222 are symmetrically arranged at both ends of the third magnetizing region 1221 in the first direction, and the magnetizing direction of the fourth magnetizing region 1222 is opposite to the magnetizing direction of the third magnetizing region 1221. Specifically, the third magnetizing regions 1221 of the two second magnetic steels 122 are arranged correspondingly, and the magnetizing directions of the two third magnetizing regions 1221 are opposite. The fourth magnetizing regions 1222 of the two second magnetic steels 122 are arranged one-to-one, and the magnetizing directions of the two correspondingly arranged fourth magnetizing regions 1222 are opposite. This embodiment is different from Figures 4 to 8 The embodiments shown are basically the same, so the same parts will not be described again here.

[0038] In some embodiments, the first magnetic steel 121 may be magnetized in one piece. In other embodiments, the first magnetic steel 121 may be magnetized in two pieces.

[0039] In some embodiments, the second magnetic steel 122 may be magnetized in one piece. In other embodiments, the second magnetic steel 122 may be magnetized in two pieces.

[0040] In some preferred embodiments, please refer to Figure 5 and Figure 6 The housing 11 is a hollow structure, and the housing 11 has two openings 112, the two openings 112 are arranged opposite to each other in the first direction, and the hollow part of the housing 11 is constructed as a receiving space 111. The vibration motor includes two elastic members 2, one of which is arranged corresponding to one of the openings 112, and the other elastic member 2 is arranged corresponding to the other opening 112. The two opposite ends of each elastic member 2 are respectively fixed to the housing 11, so that each elastic member 2 is respectively arranged across the corresponding opening 112, so that the mover 3 can be reliably and effectively suspended in the receiving space 111.

[0041] In some more preferred embodiments, please refer to Figure 4, the length of the shell 11 in the second direction is less than the length of the shell 11 in the third direction. The shell 11 includes two first surfaces 113 and two second surfaces 114. The two first surfaces 113 are spaced apart in the second direction, and the two second surfaces 114 are spaced apart in the third direction. The two first surfaces 113 and the two second surfaces 114 are jointly enclosed to form a receiving space 111. One of the first magnetic steels 121 is fixed to one of the first surfaces 113, and the other first magnetic steel 121 is fixed to the other first surface 113. One of the second magnetic steels 122 is spaced apart from one of the second surfaces 114, and the other second magnetic steel 122 is spaced apart from the other second surface 114. The elastic member 2 is fixed to the shell 11 at both ends in the third direction, so that the vibration sense can be effectively enhanced.

[0042] In some more preferred embodiments, please refer to Figure 2 , Figure 3 , Figure 6 and Fig.10 The stator 1 further includes two pole cores 13 accommodated in the accommodation space 111. The pole cores 13 are fixedly connected to the second magnetic steels 122 in a one-to-one correspondence. The two second magnetic steels 122 are arranged between the two pole cores 13, which can reduce magnetic circuit leakage and achieve a high-efficiency magnetic field. The two pole cores 13 are arranged at intervals in the third direction and symmetrically fixed to the housing 11, and there is a gap between the pole cores 13 and the second surface 114.

[0043] Specifically, the pole core 13 may be arranged parallel to the second surface 114 , and the second magnetic steel 122 may be first fixed to the corresponding pole core 13 , and then the pole core 13 may be fixed to the housing 11 .

[0044] In some embodiments, the pole core 13 may be made of a strong magnetic conductive material.

[0045] In some embodiments, the housing 11 may be made of a strong magnetic conductive material.

[0046] In some embodiments, please refer to Figure 3 The housing 11 can be an integrated structure, which further reduces the assembly process of the vibration motor and makes it easier to assemble.

[0047] In some embodiments, please refer to Fig.13In order to facilitate the processing of the housing 11, the housing 11 may be a split structure. The housing 11 is formed by assembling two shell parts 115. The two shell parts 115 are centrally symmetrically arranged about the central axis of the housing 11. Each shell part 115 includes a first plate 1151 and a second plate 1152 formed by bending from one end of the first plate 1151. One end of the first plate 1151 of one of the shell parts 115 away from the second plate 1152 is fixed to the second plate 1152 of the other shell part 115, and one end of the second plate 1152 of the shell part 115 away from the first plate 1151 is fixed to the first plate 1151 of the other shell part 115, so as to enclose and form the receiving space 111.

[0048] As an example, the two shell parts 115 can be fixedly connected by welding or the like.

[0049] In some embodiments, please refer to Fig.14 In order to further simplify the structure of the housing 11, the housing 11 can be assembled by two third plates 116 and two fourth plates 117. The two third plates 116 are spaced apart and symmetrically arranged, the two fourth plates 117 are spaced apart and symmetrically arranged, and the two third plates 116 are connected by the two fourth plates 117 to enclose and form a receiving space 111.

[0050] As an example, the third plate body 116 and the fourth plate body 117 may be fixedly connected by welding or the like.

[0051] In some preferred embodiments, please refer to Figure 3 The elastic member 2 may be a spring sheet, and a through hole 21 is provided on the elastic member 2. The first core 311 includes a first core body 3111, a first convex portion 3112, and a second convex portion 3113. The first convex portion 3112 extends and protrudes from the first core body 3111 toward the second core 312 along the first direction, and the first convex portion 3112 is connected to the second core 312. The second convex portion 3113 extends and protrudes from the first core body 3111 toward the third core 313 along the first direction, and the second convex portion 3113 is connected to the third core 313. The first convex portion 3112 and the second convex portion 3113 are symmetrically arranged in the first direction, and the first convex portion 3112 is inserted and fixed in the through hole 21 of one of the elastic members 2, and the second convex portion 3113 is inserted and fixed in the through hole 21 of the other elastic member 2.

[0052] In some embodiments, please refer to Figure 3 and Fig.12 , the first convex portion 3112 may be a step-shaped structure. It should be noted that, in other embodiments, the first convex portion 3112 may be a structure of other shapes. For example, the first convex portion 3112 may be a cylinder or a square body or any other convex shape, which may be set according to actual conditions and will not be described in detail here.

[0053] In some embodiments, please refer to Figure 3 and Fig.12 , the second convex portion 3113 may be a step-shaped structure. It should be noted that, in other embodiments, the second convex portion 3113 may be a structure of other shapes. For example, the second convex portion 3113 may be a cylinder or a square body or any other convex shape, which may be set according to actual conditions and will not be described in detail here.

[0054] In some embodiments, the core unit 31 may be made of a strong magnetic material. For example, the first core 311 may be made of a strong magnetic material, the second core 312 may be made of a strong magnetic material, and the third core 313 may be made of a strong magnetic material.

[0055] In some embodiments, the core unit 31 may be an integrally formed structure, that is, the first core 311 , the second core 312 , and the third core 313 are an integrally formed structure, which further reduces the assembly process of the vibration motor and makes it easier to assemble.

[0056] In some embodiments, please refer to Figure 3 , the core unit 31 can be a split structure. The second core 312 is installed at one end of the first core 311 in the first direction. Specifically, the second core 312 is installed at one end of the first core 311 having the first protrusion 3112, and the second core 312 is provided with a first plug hole 3121 that is plugged and matched with the first protrusion 3112. The third core 313 is installed at the other end of the first core 311 in the first direction. Specifically, the third core 313 is installed at one end of the first core 311 having the second protrusion 3113, and the third core 313 is provided with a second plug hole 3131 that is plugged and matched with the second protrusion 3113.

[0057] In some embodiments, please refer to Fig.11 and Fig.12 The core unit 31 may be a partially split structure. The first core 311 and the second core 312 are an integrated structure, the third core 313 is mounted on the first core 311 , and the third core 313 is provided with a second plug hole 3131 that is plugged and matched with the second protrusion 3113 .

[0058] In some embodiments, the first iron core 311 may be formed by laminating multiple layers of iron sheets, thereby reducing eddy current loss. It should be noted that in other embodiments, the first iron core 311 may also be an integrated structure, which may be configured according to actual conditions, and will not be described in detail here.

[0059] In some embodiments, the second core 312 may be formed by laminating multiple layers of iron sheets, thereby reducing eddy current loss. It should be noted that in other embodiments, the second core 312 may also be an integrated structure, which may be configured according to actual conditions, and will not be described in detail here.

[0060] In some embodiments, the third core 313 may be formed by laminating multiple layers of iron sheets, thereby reducing eddy current loss. It should be noted that in other embodiments, the third core 313 may also be an integrated structure, which may be configured according to actual conditions, and will not be described in detail here.

[0061] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A vibration motor, characterized in that: include: A stator, an elastic member, and a mover vibrating along a first direction; The stator comprises a shell having a receiving space, and a magnetic steel assembly received in the receiving space, wherein the magnetic steel assembly comprises two first magnetic steels and two second magnetic steels, wherein the two first magnetic steels are spaced apart in a second direction and symmetrically fixed to the shell, and the two second magnetic steels are spaced apart in a third direction and symmetrically fixed to the shell, and the first direction, the second direction and the third direction are perpendicular to each other; The two ends of the mover in the first direction are suspended in the accommodating space by the elastic members respectively. The mover includes a core unit and a winding. The core unit includes a first core, and a second core and a third core symmetrically fixed to the two ends of the first core in the first direction. The winding is wound outside the first core and located between the second core and the third core.

2. The vibration motor according to claim 1, wherein: The winding is arranged around the first direction; The two first magnetic steels are magnetized along the second direction respectively and the magnetization directions of the two are opposite, the first magnetic steel comprises a first magnetization region and a second magnetization region symmetrically arranged at two ends of the first magnetization region in the first direction, and the magnetization direction of the second magnetization region is opposite to the magnetization direction of the first magnetization region; The two second magnetic steels are magnetized along the third direction respectively and the magnetization directions of the two are opposite.

3. The vibration motor according to claim 2, characterized in that The second magnetic steel includes a third magnetizing region and fourth magnetizing regions symmetrically arranged at two ends of the third magnetizing region in the first direction, and a magnetizing direction of the fourth magnetizing region is opposite to that of the third magnetizing region.

4. The vibration motor according to claim 1, wherein: The shell is a hollow structure with two openings, the two openings are arranged opposite to each other in the first direction, and the hollow part of the shell is configured as the receiving space; The vibration motor includes two elastic members, which are arranged in one-to-one correspondence with the openings. Two opposite ends of the elastic members are respectively fixed to the housing so that each elastic member is respectively arranged across the corresponding opening.

5. The vibration motor according to claim 4, characterized in that The length of the shell in the second direction is less than the length of the shell in the third direction, the shell comprises two first surfaces spaced apart in the second direction and two second surfaces spaced apart in the third direction, the two first surfaces and the two second surfaces enclose the receiving space; The first magnetic steel is fixed to the first surface; There is a gap between the second magnetic steel and the second surface; The elastic member is respectively fixed to the housing at two ends in the third direction.

6. The vibration motor according to claim 5, characterized in that The stator further includes two pole cores accommodated in the accommodation space, the two pole cores are spaced apart in the third direction and symmetrically fixed to the housing, and there is a gap between the pole cores and the second surface; The two second magnetic steels are disposed between the two pole cores and are respectively fixed to the corresponding pole cores.

7. The vibration motor according to claim 1, wherein: The elastic member is provided with a through hole; The first core includes a first core body, a first protrusion extending from the first core body along the first direction toward the second core and connected to the second core, and a second protrusion extending from the first core body along the first direction toward the third core and connected to the third core, the first protrusion and the second protrusion are symmetrically arranged in the first direction, and the first protrusion and the second protrusion are respectively inserted into the through holes of the corresponding elastic members.

8. The vibration motor according to claim 7, wherein: The second iron core is provided with a first plugging hole plug-matched with the first protrusion, and the third iron core is provided with a second plugging hole plug-matched with the second protrusion.

9. The vibration motor according to claim 1, wherein: At least one of the first core, the second core and the third core is formed by laminating multiple layers of iron sheets.

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