WO2021134314A1

WO2021134314A1 - Linear motor

Info

Publication number: WO2021134314A1
Application number: PCT/CN2019/130143
Authority: WO
Inventors: 毛路斌; 文冬
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-08

Abstract

A linear motor of the present utility model relates to the field of motors. The linear motor comprises a housing shell having an accommodating space, a vibrator and a stator which are accommodated inside the accommodating space, and an elastic supporting member which is connected to the housing shell and suspends the vibrator inside the accommodating space. A magnetic steel assembly comprises a first magnetic steel set arranged at two sides of the solenoid along directions perpendicular to the vibration direction of the vibrator and a second magnetic steel set arranged at two sides of the first magnetic steel set along directions perpendicular to the vibration direction of the vibrator, the first magnetic steel set further comprising a first auxiliary magnet extending in the direction perpendicular to the vibrator. A mass block is provided with a through groove for mounting the first auxiliary magnet. The present utility model is simple, firm and reliable in assembly, a coil of the linear motor is in the form of a solenoid, one side of the solenoid is a three-magnetic-steel structure, and the linear motor has large driving force by optimizing the magnetic steel assembly.

Description

A linear motor

Technical field

The utility model relates to the field of motors, and relates to a linear motor.

Background technique

Linear motor is a transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism. At present, linear motors with solenoid magnetic steel components on the market generally provide system damping through foam.

The applicant found that the current technology of the solenoid single-sided three-magnet linear motor has a small driving force, and the foam assembly of the linear motor that provides system damping through foam is complicated, and the system damping stability is poor.

Summary of the invention

technical problem

The purpose of the utility model is to provide a linear motor with high damping and fast response, which does not need to install foam and has high damping.

The solution to the problem

Technical solutions

The utility model relates to a linear motor, which includes a housing with a housing space, a vibrator and a stator contained in the housing space, and an elastic support connected to the housing and suspended in the housing space The vibrator includes a mass and a magnetic steel component fixed to the mass, the stator includes a solenoid fixed to the housing, and the magnetic steel component includes a vibration direction perpendicular to the vibrator. The first magnetic steel group on both sides of the solenoid and the second magnetic steel group arranged on both sides of the first magnetic steel group along the vibration direction perpendicular to the vibrator, and the first magnetic steel group is directly opposite to the first magnetic steel group. In the solenoid, the first magnetic steel group and the second magnetic steel group are magnetized in the thickness direction, and the adjacent first magnetic steel group and the second magnetic steel group have opposite magnetization directions. The magnetizing direction of the first magnetic steel group is opposite, and the magnetizing direction of the second magnetic steel group arranged opposite is opposite. The first magnetic steel group further includes a first auxiliary magnet extending in a direction perpendicular to the vibrator, The mass block is provided with a through slot for installing the first auxiliary magnet.

As a further improvement of the present invention, the second magnetic steel group further includes a second auxiliary magnet extending in a direction perpendicular to the vibrator, and the second auxiliary magnet is received in the through slot.

As a further improvement of the present invention, the first auxiliary magnet and the first magnetic steel assembly are integrally formed, and the second auxiliary magnet and the second magnetic steel assembly are integrally formed.

As a further improvement of the present invention, the middle part of the through groove is provided with a connecting rib for reinforcing the mass, and the connecting rib divides the through groove to form a first through groove and a second through groove.

As a further improvement of the present invention, the vibrator further includes a magnetic conductive sheet located between the magnetic steel assembly and the mass block, the magnetic conductive sheet is provided with a through hole, and the first The auxiliary magnet and the second auxiliary magnet pass through the through hole and are connected to the magnetic steel assembly.

As a further improvement of the present invention, the linear motor further includes a copper sheet fixed to the housing and facing the magnetic steel component to increase the resistance of the magnetic circuit of the magnetic steel component. The orthographic projection of the vibrating direction of the vibrator all falls into the copper sheet.

As a further improvement of the present invention, the shell includes a shell cover and a bottom cover, the shell cover is provided with a magnetic conductive sheet structure, and the magnetic conductive sheet structure corresponds to the opening of the through slot.

As a further improvement of the present invention, the magnetic steel assembly further includes a third magnetic steel group arranged along the vibration direction of the vibrator, and the third magnetic steel group is respectively located on both sides of the solenoid.

The beneficial effects of the invention

Beneficial effect

The beneficial effects of the utility model are: the assembly of the utility model is simple, firm and reliable, the coil of the linear motor is in the form of a solenoid, and the solenoid is a three-magnet structure on one side. By optimizing the magnetic steel components, the linear motor has a relatively high Big driving force;

Furthermore, in the present invention, copper sheets are added to the periphery of the magnetic circuit, and the copper sheets generate eddy currents in the changing magnetic field to provide electromagnetic damping for the vibration system, and the damping effect is remarkable.

Brief description of the drawings

Description of the drawings

Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

Figure 2 is an exploded view of Figure 1 of the utility model;

Fig. 3 is a schematic diagram of the structure of Fig. 1 of the present utility model;

Figure 4 is a cross-sectional view of the utility model A-A' in Figure 3;

Figure 5 is a schematic diagram of the structure of the utility model in Figure 1 with the copper sheet removed;

Figure 6 is a schematic structural diagram of Embodiment 2 of the present utility model;

Figure 7 is a partial structural diagram of Embodiment 2 of the present utility model;

Figure 8 is a schematic structural diagram of Embodiment 3 of the present invention;

Figure 9 is a schematic structural diagram of Embodiment 4 of the present utility model;

Fig. 10 is a schematic structural diagram of Embodiment 5 of the present invention.

Among them, 10, vibrator; 1, mass; 101, through slot; 102, connecting rib; 20, stator; 2, magnetic steel assembly; 21, the first magnetic steel group; 22, the second magnetic steel group; 23, the first Three-magnet steel group; 201, first auxiliary magnet; 202, second auxiliary magnet 3, solenoid; 31, pole shoe; 32, coil; 33, iron core; 4. magnetic sheet; 5. housing; 51 5. Shell cover; 52. Bottom cover; 53, Magnetic conductive sheet structure; 6. Copper sheet; 7. Elastic support.

Invention embodiment

Detailed ways

Hereinafter, five embodiments of the present utility model will be described in detail with reference to the accompanying drawings.

Implementation 1, as shown in Figures 1 to 5:

The linear motor of this embodiment includes a housing 5 having a housing space, a vibrator 10 and a stator 20 received in the housing space, and the housing 5 is connected to the housing 5 and the vibrator is suspended in the housing. As an elastic support in the space, the housing 5 includes a shell cover 51 with a hollow structure and a bottom cover 52 sealed with the shell cover 51.

1 and 2, the stator 20 includes a solenoid 3 fixed to the housing 20. The solenoid 3 includes an iron core 33 and a coil 32 wound around the iron core. The two ends of the shoe 31 and the pole shoe 31 are riveted to the shell cover 51 and the bottom cover 52 respectively.

2 and 3, the vibrator 10 includes a mass block 1 and a magnetic steel assembly 2 fixed to the mass block 1, the length direction of the mass block 1 is consistent with the vibration direction of the vibrator 10, the mass block 1 An elastic support 7 is provided on both sides of the length direction respectively, and the elastic support 7 abuts against the cover 51, and a through hole is provided in the middle of the mass 1 to penetrate the mass 1 in the direction perpendicular to the vibration direction. The through hole is provided with a solenoid 3, and a certain gap is maintained between the mass 1 and the solenoid 3, and the magnetic steel assembly 2 is firmly connected to the inside of the through hole of the magnetic conductive sheet 4 and the mass 1, and the The magnet assembly 2 includes a first magnet assembly 21 arranged on both sides of the solenoid 3 along a vibration direction perpendicular to the vibrator 10, and a first magnet assembly 21 arranged on both sides of the solenoid 3 along a vibration direction perpendicular to the vibrator 10. The second magnetic steel group 22 on both sides of the group 21, the first magnetic steel group 21 is facing the solenoid 3, the first magnetic steel group 21 and the second magnetic steel group 22 are all along the thickness direction The magnetizing direction is opposite to that of the adjacent first magnet group 21 and the second magnet group 22, the oppositely arranged first magnet group 21 has the opposite magnetizing direction, and the oppositely arranged second magnet group 22. The magnetizing direction is opposite, so that the magnetic steel assembly 2 formed is two rows of magnets parallel to the solenoid 3, and the magnetic fields of the adjacent magnets are opposite. In this embodiment, the first magnetic steel assembly 21 is Two magnets with opposite S poles, and the second magnet group 22 is a magnet with four N poles opposite to each other.

Please refer to Figures 2, 4 and 5, the width direction of the mass 1 is provided with two through grooves 101, the through groove 101 is provided with a first auxiliary magnet 201, the first auxiliary magnet 201 and the first magnet assembly 21 is integrally formed. The cross-section of the integrally formed structure is a T-shape placed on the side. A magnetic conductive sheet 4 is provided between the first magnetic steel group 21 and the mass block 1, and the magnetic conductive member 4 is provided with a through hole. The first auxiliary magnet 201 is connected to the first magnetic steel assembly 21 through the through hole, and the two through slots 101 away from the solenoid are provided with copper sheets 6 to increase the resistance of the magnetic circuit of the magnetic steel assembly. The copper sheets 6 The flat area of is larger than the area of the outlet of the through slot 101.

In this embodiment, the magnetic steel assembly 2 has a three-magnetic steel structure on one side, which has a greater driving force. At the same time, because the first auxiliary magnet 201 integrally formed with the first magnetic steel assembly 21 is added, the two ends of the solenoid can be removed The magnetic steel makes the structure of the motor simpler, and the driving force is also improved, which is greater than the conventional magnetic circuit structure. At the same time, the copper sheet generates eddy current in the changing magnetic field to provide electromagnetic damping for the vibration system. The damping effect is significant and the response is more fast.

Implementation 2, as shown in Figure 6-7:

The structure of this embodiment is roughly the same as that of embodiment 1, except that: the magnetic steel assembly 2 further includes a third magnetic steel group 23, and two magnetic steels of the third magnetic steel group 23 are located in the solenoid 3. Along the two sides of the vibrating direction of the vibrator 10, a magnetic conductive sheet is provided between the third magnetic steel group 23 and the mass 1, so that the magnetic steel assembly 2 surrounds the solenoid 3 in a ring shape, and the third magnetic steel group 23 The N poles of the two magnets are opposed to each other, so that an N pole magnetic field is formed at both ends of the solenoid 3. This embodiment further strengthens the magnetic field of the magnet assembly 2 to increase the driving force of the motor.

Implementation 3, as shown in Figure 8:

The structure of this embodiment is roughly the same as that of embodiment 1, but the difference is that the second magnetic steel group 22 and the second auxiliary magnet 202 are integrally formed, and the two sides of the through groove 101 respectively extend in the length direction. The second auxiliary magnet 202 is received in the through slot 101, and the copper sheet 6 is elongated corresponding to the through slot 101, which can further improve the driving force and response.

Implementation 4, as shown in Figure 9:

The structure of this embodiment is roughly the same as that of embodiment 3, but the difference is that: the middle part of the through groove 101 is provided with a connecting rib 102 that reinforces the mass 1, and the connecting rib 102 divides the through groove 101 to form a first through The groove and the second through groove, the second auxiliary magnet 202 and part of the first auxiliary magnet 201 are accommodated in the first and second through grooves. Since the opening span of the through groove 101 is too large, it is easy to deform the through groove 101. The connecting ribs 102 for reinforcement are arranged between the through grooves 101 to ensure the connection strength of the mass 1.

Implementation 5, as shown in Figure 10:

The structure of this embodiment is roughly the same as that of embodiment 1, except that: the shell cover 51 has a magnetic conductive sheet structure 52, the magnetic conductive sheet structure 52 corresponds to the opening of the through slot 101, and the shell cover 51 has In the storage slot, the magnetic conductive sheet structure 52 is embedded in the receiving slot, thereby further optimizing the magnetic circuit structure of the motor to achieve greater driving force, and the magnetic conductive sheet structure is arranged in the housing cover 51, which can effectively save the housing 5 Internal space.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

A linear motor includes a housing with an accommodation space, a vibrator and a stator accommodated in the accommodation space, and an elastic support connected to the housing and suspends the vibrator in the accommodation space, so The vibrator includes a mass and a magnet assembly fixed to the mass. The stator includes a solenoid fixed to the housing. The feature is that the magnet assembly includes a vibration direction perpendicular to the vibrator. A first magnetic steel group on both sides of the solenoid and a second magnetic steel group arranged on both sides of the first magnetic steel group along a vibration direction perpendicular to the vibrator, the first magnetic steel group being directly opposite The solenoid, the first magnetic steel group and the second magnetic steel group are all magnetized in the thickness direction, and the adjacent first magnetic steel group and the second magnetic steel group have opposite magnetization directions, and are arranged opposite to each other. The magnetizing direction of the first magnet group is opposite, and the magnetizing direction of the second magnet group arranged opposite is opposite. The first magnet group further includes a first auxiliary magnet extending in a direction perpendicular to the vibrator , The mass block is provided with a through slot for installing the first auxiliary magnet.
The linear motor according to claim 1, wherein the second magnetic steel group further comprises a second auxiliary magnet extending in a direction perpendicular to the vibrator, and the second auxiliary magnet is received in the through slot in.
The linear motor according to claim 2, wherein the first auxiliary magnet and the first magnetic steel assembly are integrally formed, and the second auxiliary magnet and the second magnetic steel assembly are integrally formed.
3. The linear motor according to claim 3, wherein a connecting rib for reinforcing the mass is provided in the middle of the through groove, and the connecting rib divides the through groove to form a first through groove and a second through groove.
The linear motor according to claim 2, wherein the vibrator further comprises a magnetic conductive sheet, the magnetic conductive sheet is located between the magnetic steel assembly and the mass block, and the magnetic conductive sheet is provided with a flux The first auxiliary magnet and the second auxiliary magnet pass through the through hole to be connected to the magnetic steel assembly.
The linear motor according to any one of claims 1-5, wherein the linear motor further comprises a copper sheet fixed to the housing and facing the magnetic steel component to increase the resistance of the magnetic circuit of the magnetic steel component. All of the magnetic steel components fall into the copper sheet along the orthographic projection perpendicular to the vibration direction of the vibrator.
The linear motor according to any one of claims 1-5, wherein the housing includes a cover and a bottom cover, the cover is provided with a magnetic conductive sheet structure, and the magnetic conductive sheet structure is connected to the magnetic conductive sheet structure. The opening of the through slot corresponds.
The linear motor according to any one of claims 1 to 5, wherein the magnetic steel assembly further comprises a third magnetic steel group arranged along the vibration direction of the vibrator, and the third magnetic steel groups are respectively located at On both sides of the solenoid.