CN111835178A

CN111835178A - Miniature split type linear motor

Info

Publication number: CN111835178A
Application number: CN202010820054.8A
Authority: CN
Inventors: 聂鹏举; 刘辉; 黎平; 伍毅; 罗铁志; 朱勇民
Original assignee: Shenzhen Kelier Motor Co ltd
Current assignee: Shenzhen Kelier Motor Co ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2020-10-27

Abstract

The invention discloses a miniature split type linear motor which comprises a casing (1), a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are arranged in the casing (1), and the rotor assembly comprises a tungsten block (7), an insert (4), a permanent magnet (3), a spring piece (5), a stop block (6) and a yoke (2); the stator assembly comprises an F-PCB (9), a coil (8) and a support (11), the coil (8) and the F-PCB (9) are fixedly connected to the support (11) of the linear motor, and the tungsten block (7) and the permanent magnet (3) are fixedly installed together. The installation position of the spring piece is arranged in the connection part of the tungsten block and the insert, the force arm of the spring piece can be shortened for a linear motor with a wider size in the Y direction, so that the larger gravity in the Z direction of the tungsten block can be borne, the risk of deformation in the Z direction is reduced, the problem of small frequency of two sections in modal analysis is solved, the insert is structurally integrated with a stop part, and the stop part does not need to be additionally welded at the end of the tungsten block.

Description

Miniature split type linear motor

Technical Field

The invention relates to the field of motors, in particular to a miniature split type linear motor.

Background

The linear motor generally comprises a rotor assembly and a stator assembly, wherein the rotor assembly comprises a tungsten block, an insert, a permanent magnet, a spring plate, a yoke, a stop block and the like; the stator assembly includes an F-PCB, a coil, a bracket, etc.

When the spring piece (stainless steel material) and the tungsten block (tungsten alloy material) are directly welded by laser, the difference of melting points of the two materials is large, so that the problems that the consistency of welding and fixing force is poor, more welding bead particles cause high reject ratio of motor noise, part of the spring piece is melted to cause easy breakage in a service life test and the like are caused.

In addition, the assembly structure among the spring leaf, the tungsten block and the insert is unreasonable, and for a linear motor with a wider size in the Y direction, the force arm of the spring leaf is longer, so that the spring leaf cannot bear the larger gravity in the Z direction of the tungsten block, the risk of Z-direction deformation is increased, and the condition of small frequency of two sections in modal analysis is easy to occur.

Disclosure of Invention

The invention aims to solve the technical problem of a miniature split type linear motor, which can effectively overcome the defects in the prior art.

The invention is realized by the following technical scheme: a miniature split type linear motor comprises a casing, a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are installed in the casing;

the stator component comprises an F-PCB, a coil and a bracket, wherein the coil and the F-PCB are fixedly connected to the bracket of the linear motor, and a tungsten block and a permanent magnet are fixedly installed together; the insert is embedded in the tungsten block, and the coil is positioned in the magnetic field range of the permanent magnet;

the insert is provided with a stop part, a clamping groove is formed between the stop part and the insert, one end of a spring piece is buckled into the clamping groove for fixation, the other end of the spring piece is fixedly provided with a stop block, and the spring piece is used for supporting the tungsten block to be parallel.

As a preferred technical scheme, the tungsten block is provided with a mounting groove position for the insert to be installed, the insert is buckled in the mounting groove position, and one end of the spring piece is installed inside the tungsten block along with the insert.

As a preferable technical scheme, the insert is made of stainless steel, and the insert is made of the same material as the spring piece.

As a preferred technical scheme, the spring pieces are arranged into at least two pieces which are respectively arranged at two sides of the tungsten block, the stop blocks are arranged into at least two pieces, and each spring piece corresponds to one stop block.

As a preferred technical scheme, a space is reserved towards the middle of the tungsten block, and a permanent magnet is installed in the space.

As a preferred technical scheme, the permanent magnets are arranged in a Halbach array mode.

As the preferred technical scheme, the insert and the tungsten block are fixed by pressing or glue or riveting, or the two elements are tightly combined together by adopting in-mold injection molding sintering.

As a preferred technical scheme, the insert is welded with the spring piece, the insert protrudes out of the upper end face of the tungsten block, a gap is reserved between the insert and the tungsten block during welding, and the spring piece and the tungsten block are prevented from colliding to generate noise during resonant vibration.

The invention has the beneficial effects that: the insert is made of stainless steel and is close to the melting point of the spring piece, so that the welding temperature can be reduced to a great extent during laser welding, the fixing force can be effectively ensured, and the risks of welding bead splashing and difficulty in melting the position of the spring piece are reduced;

the installation position of the spring piece is arranged in the connection part of the tungsten block and the insert, and the force arm of the spring piece can be shortened for a linear motor with a wider size in the Y direction, so that the larger gravity of the tungsten block in the Z direction can be borne, the risk of Z-direction deformation is reduced, and the problem of small frequency of the two sections in modal analysis is solved;

and thirdly, the insert of the invention structurally integrates a stop part, and the stop part is not required to be additionally welded at the end of the connecting tungsten block.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of the present invention;

FIG. 2 is an internal cross-sectional view of the present invention;

FIG. 3 is a schematic view of the assembly of the tungsten block and the spring plate according to the present invention;

fig. 4 is a schematic view of the insert structure.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

In the description of the present invention, it is to be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "central", "end", "length", "outer end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

Further, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The use of terms such as "upper," "above," "lower," "below," and the like in describing relative spatial positions herein is for the purpose of facilitating description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly

In the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "sleeved," "connected," "penetrating," "plugged," and the like are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-3, the miniature split linear motor of the present invention comprises a casing 1, and a mover assembly and a stator assembly installed in the casing 1, wherein the mover assembly comprises a tungsten block 7, an insert 4, a permanent magnet 3, a spring plate 5, a stop block 6 and a yoke 2;

the stator assembly comprises an F-PCB9, a coil 8 and a bracket 11, wherein the coil 8 and the F-PCB9 are fixedly connected to the bracket 11 of the linear motor, and a tungsten block 7 and a permanent magnet 3 are fixedly installed together; the insert 4 is embedded in the tungsten block 7, and the coil 8 is positioned in the magnetic field range of the permanent magnet 3;

the insert 4 is provided with a stop part 41, and a clamping groove 42 is formed between the stop part 41 and the insert 4, as shown in fig. 4, the insert structurally integrates a stop block, and the stop block does not need to be additionally welded at the end for connecting the tungsten block; one end of the spring piece 5 is buckled in the clamping groove for fixing, the other end of the spring piece 5 is fixedly provided with a stop block 6, and the spring piece 5 is used for supporting the tungsten block 7 to be parallel.

In this embodiment, the tungsten block 7 is provided with a mounting slot into which the insert is inserted, the insert 4 is buckled into the mounting slot, and one end of the spring piece 5 is inserted into the tungsten block 7 together with the insert 4.

The insert 4 is made of stainless steel and is made of the same material as the spring piece 5, the melting point of the insert is close to that of the spring piece, welding temperature can be reduced to a great extent during laser welding, fixing force of the insert can be effectively guaranteed, and risks of splashing of welding beads and difficulty in melting of the spring piece are reduced.

In this embodiment, the spring pieces 5 are provided as at least two pieces, which are respectively installed on both sides of the tungsten block 7, and the stoppers 41 are provided as at least two pieces, each spring piece 5 corresponding to one stopper 41.

Wherein, tungsten block 7 reserves a space to the middle, installs permanent magnet 3 in this space.

In this embodiment, the permanent magnets 3 are arranged in a halbach array manner, which increases the magnetic induction intensity and improves the utilization rate of the permanent magnets.

In this embodiment, the insert 4 and the tungsten block 7 are fixed by pressing or glue or riveting, or the two elements are tightly combined together by in-mold injection molding and sintering, and any one of the two elements can be selected according to actual needs.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. A miniature split type linear motor is characterized in that: the stator comprises a machine shell (1), a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are installed in the machine shell (1), and the rotor assembly comprises a tungsten block (7), an insert (4), a permanent magnet (3), a spring piece (5), a stop block (6) and a yoke (2);

the stator assembly comprises an F-PCB (9), a coil (8) and a bracket (11), the coil (8) and the F-PCB (9) are fixedly connected to the bracket (11) of the linear motor, and the tungsten block (7) and the permanent magnet (3) are fixedly installed together; the insert (4) is embedded in the tungsten block (7), and the coil (8) is positioned in the magnetic field range of the permanent magnet (3);

the insert (4) is provided with a stop part (41), a clamping groove (42) is formed between the stop part (41) and the insert (4), one end of the spring piece (5) is buckled into the clamping groove for fixation, the other end of the spring piece (5) is fixedly provided with a stop block (6), and the spring piece (5) is used for supporting the tungsten block (7) to be parallel.

2. The miniature split-type linear motor according to claim 1, wherein: the tungsten block (7) is provided with a mounting groove position for the insert to be installed, the insert (4) is buckled in the mounting groove position, and one end of the spring piece (5) is installed inside the tungsten block (7) along with the insert (4).

3. The miniature split-type linear motor according to claim 1, wherein: the insert (4) is made of stainless steel and is made of the same material as the spring piece (5).

4. The miniature split-type linear motor according to claim 1, wherein: the spring pieces (5) are arranged into at least two pieces and are respectively arranged on two sides of the tungsten block (7), the stop blocks (41) are arranged into at least two pieces, and each spring piece (5) corresponds to one stop block (41).

5. The miniature split-type linear motor according to claim 1, wherein: the tungsten block (7) reserves a space towards the middle, and the permanent magnet (3) is arranged in the space.

6. The miniature split-type linear motor according to claim 1, wherein: the permanent magnets (3) are arranged in a Halbach array mode.

7. The miniature split-type linear motor according to claim 1, wherein: the insert (4) and the tungsten block (7) are fixed by pressing in or glue or riveting, or the two elements are tightly combined together by adopting in-mold injection molding sintering.

8. The miniature split-type linear motor according to claim 1, wherein: the insert (4) is welded with the spring piece (5), the insert (4) protrudes out of the upper end surface of the tungsten block (7), and a gap is reserved between the insert and the tungsten block (7) during welding.