WO2021128172A1

WO2021128172A1 - Linear motor

Info

Publication number: WO2021128172A1
Application number: PCT/CN2019/128736
Authority: WO
Inventors: 毛路斌
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: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-07-01

Abstract

A linear motor, relating to the technical field of motors. The linear motor comprises: a housing (1) having an accommodating space, and a stator (4) and a vibrator (3) accommodated in the accommodating space. The stator (4) is fixedly connected to the housing (1), and the vibrator (3) is elastically connected to the housing (1) by means of an elastic member (2). The stator (4) comprises a fixed member (41) fixed to the housing (1), an iron core (422) riveted to the fixed member (41), and a coil (421) disposed at the periphery of the iron core (422). The vibrator (3) comprises a magnetic circuit system (32) and a mass block (31). The iron core (422) is provided with stepped limiting structures, and the iron core (422) is riveted to the fixed member (41) by means of the limiting structures. The linear motor is simple to assemble, firm and reliable; the stepped limiting structures added to both ends of the iron core provide axial limitation while riveting a copper sheet, so that the iron core is riveted to the copper sheet more firmly; moreover, the structural features of the limiting structures make the assembly easier.

Description

A linear motor

Technical field

The utility model relates to the technical 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. Currently, linear motors with solenoid magnetic circuit structures on the market generally use iron cores to be directly riveted with copper sheets.

The applicant found that the linear solenoid assembly stability in the current technology depends on the riveting strength, which is not easy to assemble, and there is a risk of falling.

Summary of the invention

technical problem

The purpose of the utility model is to provide a linear motor to improve the assembly reliability of the iron core and the copper sheet.

The solution to the problem

Technical solutions

A linear motor of the present invention includes a housing with a housing space, a stator and a vibrator contained in the housing space, the stator is fixedly connected to the housing, and the vibrator is connected to the housing through an elastic member. Body elastic connection, the stator includes a fixing member fixed to the housing, an iron core riveted to the fixing member, and a coil provided on the periphery of the iron core, the vibrator includes a magnetic circuit system and a mass, so The iron core is provided with a stepped limiting structure, and the iron core is riveted with the fixing member through the limiting structure.

As a further improvement of the present invention, the iron core includes a main body part and a limiting part, the limiting part is located at both ends of the main body part, and the cross-section of the limiting part is the same as the cross-sectional shape of the main body part. The cross-sectional area of the limiting portion is smaller than the cross-sectional area of the main body, forming the limiting structure.

As a further improvement of the present invention, the main body part has a quadrangular prism structure, and the cross section of the main body part is rectangular.

As a further improvement of the present invention, the edges of the iron core are all rounded structures.

As a further improvement of the present invention, the axis of the main body part is the same as the axis of the limiting part.

As a further improvement of the present invention, the fixing member is a copper sheet.

As a further improvement of the present invention, there are two fixing parts, which are arranged parallel to each other and relatively spaced apart, the iron core is arranged between the two fixing parts, and the limiting part extends into the fixing part. The through hole is connected with the fixing part, and the edge of the main body part close to the limiting part is close to the fixing part.

As a further improvement of the present invention, the number of the coil and the iron core are both two, and the two iron cores are both riveted to the fixing member through the limiting structure.

As a further improvement of the present invention, the housing includes an upper cover and a lower cover forming the receiving space, and both the upper cover and the lower cover are provided with a card slot, and the fixing member is connected to the card slot Riveted.

As a further improvement of the present invention, the mass block is provided with a cavity located in the center, the magnetic circuit system is arranged in the cavity and fixed to the inner wall of the cavity, and the magnetic circuit system includes an opposite arrangement The two sets of magnetic components are arranged on opposite sides of the inner wall, and the stator is located between the two sets of magnetic components.

The beneficial effects of the invention

Beneficial effect

The beneficial effects of the utility model are: the utility model is simple to assemble, firm and reliable. The linear motor adds a step-like limit structure through the two ends of the iron core, and the copper sheet is riveted while providing the axial limit of the iron core to make it The riveting with the copper sheet is more reliable, and the structural feature of the limit structure makes the assembly easier.

Brief description of the drawings

Description of the drawings

Figure 1 is a perspective view of the overall structure of Figure 1 of the utility model;

Figure 2 is a cross-sectional view of the utility model along the long axis of Figure 1;

Figure 3 is a schematic structural view of the utility model with the upper cover removed from Figure 1;

Figure 4 is a cross-sectional view of the utility model showing the iron core structure cut along the short axis in Figure 1;

Figure 5 is a cross-sectional view of the utility model showing the iron core structure cut along the thickness direction in Figure 1;

Fig. 6 is a schematic diagram of the iron core structure of the present invention.

Among them, 1. housing; 2. elastic part; 3. vibrator; 31, mass block; 32, magnetic circuit system; 321, magnetic steel; 322, pole core; 323, soft magnet; 4. stator; 41, fixed part 42. Coil assembly; 421. Coil; 422. Iron core; 4221. The main body; 4222. The limit part; 5. The upper cover; 6. The lower cover.

Invention embodiment

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 6: a linear motor includes a housing 1 with a housing space, a stator 4 and a vibrator 3 received in the housing space, and the stator 4 is fixedly connected to the housing 1, so The vibrator 3 is elastically connected to the housing 1 through an elastic member 2. The housing 1 includes an upper cover 5 and a lower cover 6 forming the receiving space, and both the upper cover 5 and the lower cover 6 are provided with There is a card slot, and a fixing member 41 is riveted to the card slot.

The stator 4 includes a fixing member 41 fixed to the housing 1 and a coil assembly 42. The coil assembly 42 includes an iron core 422 riveted to the fixing member 41 and a coil 421 provided on the periphery of the iron core 422. The iron core 422 is provided with a step-shaped limiting structure, and the iron core 422 is riveted to the fixing member 41 through the limiting structure. While riveting with the fixing member 41, an axial limit of the iron core 422 is provided, so that it can be riveted with the fixing member 41 more firmly, and the structural feature of the limit structure makes the assembly easier. The core 422 includes a main body portion 4221 and a limiting portion 4222. The limiting portion 4222 is located at both ends of the main body portion 4221. The limiting portion 4222 has the same cross-section as the main portion 4221 and has the same shape. The cross-sectional area of the limiting portion 4222 is smaller than the cross-sectional area of the main body portion 4221 to form the limiting structure. The main body portion 4221 has a quadrangular prism structure, the cross-section of the main body portion 4221 is rectangular, the edges of the iron core 422 are rounded, and the axis of the main portion 4221 and the axis of the limiting portion 4222 Similarly, the limiting structure is a stepped structure formed by the different cross sections of the edge of the main body portion 4221 and the limiting portion 4222, and the limiting portion 4222 extends into the groove of the fixing member 41 to be interference-connected with the fixing member 41, The edge of the main body portion 4221 is close to the inner wall of the fixing member 41. In this embodiment, the fixing member 41 is a copper sheet. There are two fixing members 41, which are arranged parallel to each other and spaced apart from each other. The iron core 422 is arranged between the two fixing members 41, and the limiting portion 4222 It extends into the through hole of the fixing member 41 and is connected to the fixing member 41, and the edge of the main body portion 4221 close to the limiting portion 4222 is close to the fixing member 41.

The vibrator 3 includes a magnetic circuit system 32 and a mass block 31, the mass block 31 is provided with a cavity in the center, and the magnetic circuit system 32 is arranged in the cavity and fixed to the inner wall of the cavity, The magnetic circuit system 32 includes two sets of oppositely arranged magnetic parts, the two sets of the magnetic parts are arranged on opposite sides of the inner wall, the stator 4 is located between the two sets of the magnetic parts, and each set of the magnetic parts The components include a main magnet 321, an auxiliary magnet 322 and a pole core 323. The main magnet 321 has three and the auxiliary magnet 322 has two. The three main magnets 321 are arranged in parallel and the two auxiliary magnets 322 are arranged in parallel. Interspersed between the magnets 321, the pole core 323 surrounds the outer sides of the main magnet 321 and the auxiliary magnet 322, and the position of the auxiliary magnet 322 corresponds to the position of the iron core 422.

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 stator and a vibrator accommodated in the accommodation space, the stator is fixedly connected to the housing, and the vibrator is elastically connected to the housing through an elastic member, The stator includes a fixing part fixed to the housing, an iron core riveted to the fixing part, and a coil arranged on the periphery of the iron core. The vibrator includes a magnetic circuit system and a mass, and is characterized in that: The iron core is provided with a stepped limiting structure, and the iron core is riveted with the fixing member through the limiting structure.
The linear motor according to claim 1, wherein the iron core includes a main body part and a limit part, the limit part is located at both ends of the main part, and the cross section of the limit part is the same as the The main body has the same cross-sectional shape and the cross-sectional area of the limiting portion is smaller than the cross-sectional area of the main body, forming the limiting structure.
The linear motor according to claim 2, wherein the main body part has a quadrangular prism structure, and the cross section of the main body part is rectangular.
The linear motor according to claim 3, wherein the edges of the iron core are all rounded.
The linear motor according to claim 4, wherein the axis of the main body part is the same as the axis of the limiting part.
The linear motor according to claim 5, wherein the fixing member is a copper sheet.
The linear motor according to claim 6, characterized in that there are two fixing parts, which are arranged parallel to each other and at a relatively spaced interval, the iron core is arranged between the two fixing parts, and the limiting part extends It is inserted into the through hole of the fixing piece to be connected with the fixing piece, and the edge of the main body part close to the limiting part is close to the fixing piece.
The linear motor according to claim 1, wherein the number of the coil and the iron core are both two, and the two iron cores are both riveted to the fixing member through the limiting structure.
The linear motor according to claim 1, wherein the housing includes an upper cover and a lower cover forming the accommodating space, and both the upper cover and the lower cover are provided with a card slot, and the fixing The piece is riveted with the card slot.
The linear motor according to claims 1-9, wherein the mass block is provided with a cavity in the center, and the magnetic circuit system is arranged in the cavity and fixed to the inner wall of the cavity, The magnetic circuit system includes two sets of oppositely arranged magnetic parts, the two sets of the magnetic parts are arranged on opposite sides of the inner wall, and the stator is located between the two sets of the magnetic parts.