CN117458753A - Linear motor secondary and linear motor - Google Patents

Abstract

The invention provides a linear motor secondary and a linear motor, wherein the linear motor secondary comprises a magnetic yoke plate, a permanent magnet and a positioning block; the number of the permanent magnets is more than two, the number of the positioning blocks is equal to that of the permanent magnets, the positioning blocks and the permanent magnets are sequentially staggered on the magnetic yoke plate along the straight line direction, and the polarities of the adjacent two permanent magnets are opposite; each positioning block is distributed on the magnetic yoke plate at equal intervals along the straight line direction; the same side of each positioning block along the linear direction is propped against the adjacent permanent magnets so as to stop and position the same side of each permanent magnet along the linear direction. According to the technical scheme, the positioning block stop is arranged on the same side of each permanent magnet along the linear direction, so that a gap is not required to be formed on each permanent magnet, the structural integrity of the permanent magnet can be ensured, and the technical problems that the permanent magnet is uneven in magnetic field distribution, the magnetic field intensity of the permanent magnet at the gap is weakened and the manufacturing cost of the permanent magnet is increased due to the fact that the gap is formed on the permanent magnet are solved.

Description

Linear motor secondary and linear motor

Technical Field

The invention belongs to the technical field of linear motors, and particularly relates to a secondary of a linear motor and the linear motor.

Background

The linear motor is one of core parts of the high-end numerical control equipment. Through linear motor, parts such as lathe feed system simplification ball and bearing have avoided the lead screw high-speed rotation to produce vibration, long span to lead to problem such as assembly difficulty for the numerical control lathe feed function can satisfy high accuracy, high-speed, high response speed requirement simultaneously, thereby satisfies and improves customer production efficiency, promotes the surface quality and the added value of processing work piece. The accuracy of the feed system depends on the stability of the thrust generated by the linear motor. Therefore, the design and manufacturing links of the linear motor do a lot of work around reducing the thrust fluctuation amount. The position accuracy of the permanent magnet arrangement of the secondary part (stator) of the linear motor has a direct influence on the magnetic field.

As shown in fig. 1, a linear motor secondary is disclosed in the related art, which includes a yoke plate 2, a permanent magnet 1, and a positioning pin 3. Wherein, an arc-shaped left notch 6 is arranged on the left side wall of the permanent magnet 1, and two arc-shaped right notches 7 are arranged on the right side wall of the permanent magnet 1. The magnetic yoke plate 2 is provided with a plurality of first locating holes corresponding to the left notch positions and second locating holes corresponding to the two right notch positions along the length direction respectively, the arrangement sequence of the first locating holes and the second locating holes on the magnetic yoke plate 2 along the length direction is that the first locating holes and the second locating holes are staggered, locating pins 3 are fixed in the first locating holes and the second locating holes of the magnetic yoke plate 2, and the permanent magnets 1 are fixed on the upper surface of the magnetic yoke plate 2 through the first locating holes and the second locating holes, so that the interval distance consistency of the installed permanent magnets 1 is ensured.

The semicircular notches for positioning are formed in the two sides of the permanent magnet 1 in the secondary of the linear motor, so that the magnetic field intensity of the permanent magnet 1 at the corresponding position is reduced, the thrust output of the linear motor is reduced, and the response capability of a machine tool system is affected; meanwhile, after gaps are formed on the left side and the right side of the permanent magnet 1, the magnetic field of the permanent magnet 1 is uneven, so that the fluctuation amount of thrust output is increased, and the positioning accuracy of a machine tool system is affected. In addition, the gaps are formed in the left side and the right side of the permanent magnet 1, so that the manufacturing cost of the permanent magnet 1 is increased, the cost performance of the motor is reduced, and the competitiveness of linear motor products is weakened.

Disclosure of Invention

Therefore, the invention provides a secondary linear motor and a linear motor, which can solve the technical problems of uneven magnetic field distribution of a permanent magnet, weakening of magnetic field intensity of the permanent magnet at a notch and increase of manufacturing cost of the permanent magnet caused by positioning the permanent magnet in a mode of forming the notch in the prior art.

In order to solve the above problems, the present invention provides a secondary of a linear motor, which includes a secondary module including a yoke plate, a permanent magnet, and a positioning block;

the number of the permanent magnets is more than two, the number of the positioning blocks is equal to that of the permanent magnets, the positioning blocks and the permanent magnets are sequentially staggered on the magnetic yoke plate along the straight line direction, and the polarities of the adjacent two permanent magnets are opposite;

wherein each positioning block is distributed on the magnetic yoke plate at equal intervals along the linear direction; and the same side of each positioning block along the linear direction is propped against the adjacent permanent magnets so as to stop and position each permanent magnet at the same side of the linear direction.

In some embodiments, the magnetic yoke plate is provided with positioning grooves, the number of the positioning grooves is equal to that of the positioning blocks, and one end of each positioning block is inserted into the corresponding positioning groove in a one-to-one correspondence manner.

In some embodiments, each positioning groove is a groove body structure with a bottom width larger than an opening width, and one end of each positioning block is provided with an external shape consistent with the corresponding positioning groove.

In some embodiments, each positioning groove penetrates through two ends of the yoke plate along a first direction, the first direction is perpendicular to the straight line direction, and one end of each positioning block is inserted into the corresponding positioning groove along the first direction.

In some embodiments, the yoke plate has a permanent magnet positioning face, the yoke plate providing support to each of the permanent magnets by a permanent magnet positioning face;

each positioning block is a magnetic conduction block and protrudes out of the permanent magnet positioning surface, and each positioning block is used for magnetic conduction along the direction perpendicular to the permanent magnet positioning surface.

In some embodiments, the height of each positioning block protruding out of the permanent magnet positioning surface is uniform.

In some embodiments, each of the positioning blocks is formed by stacking magnetic conductive sheets.

In some embodiments, the number of the secondary modules is more than two, and the secondary modules are sequentially arranged along the linear direction;

wherein the permanent magnet on one side of one sub-module is adjacent to the positioning block on one side of the adjacent other sub-module.

The invention also provides a linear motor, which comprises the linear motor secondary of any one of the above.

The secondary and linear motor provided by the invention has the following beneficial effects:

1. compared with the prior art, the positioning is performed by forming the notch on the permanent magnet, and the positioning block stop is arranged on the same side of each permanent magnet along the linear direction, so that the notch is not required to be formed on the permanent magnet, the structural integrity of the permanent magnet can be ensured, and the technical problems that the magnetic field distribution of the permanent magnet is uneven, the magnetic field intensity of the permanent magnet at the notch is weakened and the manufacturing cost of the permanent magnet is increased due to the notch formed on the permanent magnet are avoided.

2. Because each locating piece is distributed at equal intervals, and each locating piece is positioned to the adjacent permanent magnet stop by the same side in the linear direction, each permanent magnet can be distributed at equal intervals in the linear direction, so that the position arrangement precision of each permanent magnet is improved, the position consistency of each permanent magnet is ensured, the inconformity of the locating force and the thrust of the linear motor in different positions due to the position deviation of the permanent magnet is avoided, the increase of thrust fluctuation is avoided, the thrust fluctuation of the linear motor is limited in the design range, the consistency of motor output is ensured, and the locating precision and the repeated locating precision of the linear feeding system are improved.

3. Because each positioning block protrudes out of the permanent magnet positioning surface and is magnetically conductive along the direction perpendicular to the permanent magnet positioning surface, the magnetic resistances of the primary side of the linear motor and the secondary side of the linear motor are periodically changed in the feeding direction, so that magnetic resistance thrust can be generated in the magnetic field alternating process, the peak thrust of the linear motor can be increased, the response speed of a linear feeding system can be improved, and the dimensional accuracy of corresponding numerical control machine tool processing is improved.

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. The drawings in the following description are merely exemplary and other implementations drawings may be derived from the drawings provided without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a secondary structure of a linear motor according to the prior art;

FIG. 2 is a schematic view of a secondary structure of a linear motor according to an embodiment of the present invention;

FIG. 3a is a cross-sectional view of a linear motor secondary of the present invention;

FIG. 3b is an enlarged view at A in FIG. 3 a;

fig. 4 is a schematic structural view of a yoke plate according to the present invention;

FIG. 5a is a schematic view of a positioning block according to the present invention;

FIG. 5b is a schematic structural view of the magnetic conductive sheet;

FIG. 6a is a schematic diagram of a linear motor primary in opposition to a linear motor secondary positioning block;

FIG. 6b is a schematic diagram of a linear motor primary versus a linear motor secondary permanent magnet positioning surface;

FIG. 7a is a schematic diagram of the correct assembly of two sub-modules according to the present invention;

FIG. 7b is a schematic diagram of a misalignment assembly of two sub-modules according to the present invention.

The reference numerals are:

1. a yoke plate; 2. a permanent magnet; 3. a positioning block; 31. one end of the positioning block; 10. a primary stage; 100. a permanent magnet positioning surface; 101. a positioning groove; 102. a fixing hole; 200. a secondary module; 301. magnetic conductive sheets; a. a straight line direction; b. a first direction.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. It should be understood, however, that the construction, proportion, and size of the drawings, in which the present invention is practiced, are all intended to be illustrative only, and not to limit the scope of the present invention, which should be defined by the appended claims. Any structural modification, proportional change or size adjustment should still fall within the scope of the disclosure without affecting the efficacy and achievement of the present invention. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations 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 "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

Referring to fig. 2 to 5b in combination, according to an embodiment of the present invention, there is provided a linear motor secondary including a secondary module 200, the secondary module 200 including a yoke plate 1, a permanent magnet 2, and a positioning block 3. The number of the permanent magnets 2 is more than two, the number of the positioning blocks 3 and the number of the permanent magnets 2 are equal, and the positioning blocks 3 and the permanent magnets 2 are sequentially staggered on the magnetic yoke plate 1 along the linear direction a. The polarities of the adjacent two permanent magnets 2 are opposite, specifically, the polarities of the permanent magnets 2 are sequentially alternated along the linear direction a, i.e. arranged in a manner of N pole, S pole, N pole, S pole … ….

The positioning blocks 3 are equally spaced apart from each other in the straight line direction a on the yoke plate 1. The same side of each positioning block 3 along the linear direction a is abutted against the adjacent permanent magnet 2 so as to stop and position each permanent magnet 2 on the same side of the linear direction a. Specifically, the two sides of each positioning block 3 along the straight line direction a are respectively a left side and a right side, and in one example, as shown in fig. 2, the left side of each positioning block 3 along the straight line direction a abuts against the adjacent permanent magnet 2 to stop and position each permanent magnet 2 on the right side of the straight line direction a. Alternatively, in another example, each positioning block 3 abuts against the adjacent permanent magnet 2 on the right side in the straight line direction a to stop and position each permanent magnet 2 on the left side in the straight line direction a.

In the above example, since the positioning blocks 3 are distributed at equal intervals, and the adjacent permanent magnets 2 are stopped and positioned on the same side of the linear direction a by the positioning blocks 3, the permanent magnets 2 can also be distributed at equal intervals in the linear direction a, so that the position arrangement precision of the permanent magnets 2 is improved, the position consistency of the permanent magnets 2 is ensured, the inconsistent positioning force and the inconsistent thrust of the linear motor at different positions caused by the position deviation of the permanent magnets 2 is avoided, the increase of thrust fluctuation is avoided, the thrust fluctuation of the linear motor can be limited within the design range, the consistency of motor output is ensured, and the positioning precision and the repeated positioning precision of the linear feeding system are improved.

In addition, compared with the positioning in the prior art by forming the notch on the permanent magnet, the positioning block 3 is arranged on the same side of each permanent magnet 2 along the linear direction a for stopping and positioning, so that the notch on the permanent magnet 2 is not required, the structural integrity of the permanent magnet 2 can be ensured, and the technical problems that the magnetic field distribution of the permanent magnet 2 is uneven, the magnetic field intensity of the permanent magnet 2 at the notch is weakened and the manufacturing cost of the permanent magnet 2 is increased due to the notch on the permanent magnet 2 are avoided.

What needs to be explained here is: as shown in fig. 2, the above-described feeding method is a feeding method in which the linear direction a is a linear motor. The secondary of the linear motor of the present invention may be plate-shaped. The yoke plate 1 is positioned at the bottom, and the permanent magnet 2 and the positioning block 3 are arranged on the permanent magnet positioning surface 100 of the yoke plate 1. In a specific application example, the secondary side of the linear motor of the invention is arranged with the permanent magnets 2 starting at one side and the positioning blocks 3 ending at the other side.

As shown in the figure, the whole of the yoke plate 1 may be a rectangular plate, and the yoke plate 1 is made of a magnetic conductive material. The yoke plate 1 has fixing holes 102 on both sides for fixing the yoke plate 1 to the apparatus.

The direction of magnetization of the permanent magnet 2 is the same as the normal direction of the permanent magnet positioning surface 100. As shown in fig. 2, the same column of permanent magnets 2 has the same polarity, and the polarities of two adjacent columns of permanent magnets 2 are opposite.

In order to mount the positioning blocks 3 on the yoke plate 1, as shown in fig. 3a and 3b, positioning grooves 101 may be provided on the yoke plate 1, the number of the positioning grooves 101 is equal to that of the positioning blocks 3, and one end 31 of each positioning block is inserted into the corresponding positioning groove 101 in a one-to-one correspondence manner.

In the above example, each positioning block 3 is mounted on the yoke plate 1 in a plugging manner, which is particularly convenient for assembly.

As shown in fig. 3b, each positioning groove 101 has a groove structure with a bottom width larger than an opening width, and one end 31 of each positioning block has an external shape consistent with the corresponding positioning groove 101. In a specific application example, each positioning groove 101 may be a dovetail groove, and each positioning block has one end 31 with a dovetail shape.

In the above example, by designing each positioning groove 101 as a groove body structure having a bottom width larger than an opening width and having one end 31 of each positioning block with an outer shape conforming to the corresponding positioning groove 101, it is possible to prevent the positioning block 3 from coming out of the positioning groove 101, thereby improving the fitting stability of the positioning block 3 with the yoke plate 1.

In order to facilitate the assembly of the positioning blocks 3 into the positioning slots 101 having a bottom width larger than the opening width, as shown in fig. 2 and 4, each positioning slot 101 penetrates through two ends of the yoke plate 1 along a first direction b, which is perpendicular to the straight line direction a, and one end 31 of each positioning block is inserted into the corresponding positioning slot 101 along the first direction b.

As shown in fig. 2 and 4, the aforementioned yoke plate 1 has a permanent magnet positioning surface 100, and the yoke plate 1 provides support for each permanent magnet 2 through the permanent magnet positioning surface 100. Wherein each positioning block 3 is a magnetic conductive block and protrudes out of the permanent magnet positioning surface 100, and each positioning block 3 is used for magnetic conduction along the direction c perpendicular to the permanent magnet positioning surface 100.

In the above example, since each positioning block 3 protrudes out of the permanent magnet positioning surface 100 and is magnetically conductive in the direction c perpendicular to the permanent magnet positioning surface 100, the magnetic resistances of the primary 10 and the secondary of the linear motor of the present invention periodically change in the feeding direction, specifically, when the primary 10 and the positioning block 3 of the linear motor are opposite, the length L1 of the air gap in the magnetic circuit formed by the primary 10 and the secondary is short at this time, so that the magnetic field magnetic resistance is small, as shown in fig. 6 a; as shown in fig. 6b, when the primary 10 of the linear motor is opposite to the permanent magnet positioning surface 100 between the adjacent two positioning blocks 3, the length L2 of the air gap in the magnetic circuit formed by the primary 10 and the secondary is longer, so that the magnetic field has large magnetic resistance. The magnetic resistance between the primary 10 and the secondary is periodically changed, so that magnetic resistance thrust can be generated in the magnetic field alternating process, the peak thrust of the linear motor is increased, the response speed of a linear feeding system can be improved, and the dimensional accuracy of corresponding numerical control machine tool processing is improved.

In a specific application example, the permanent magnet positioning surface 100 is a plane, and each of the aforementioned permanent magnets 2 may be adhered to the permanent magnet positioning surface 100. Each of the positioning blocks 3 may be made of silicon steel. The magnetic conductivity of the silicon steel material is anisotropic, but the dominant magnetic direction of the positioning block 3 made of the silicon steel material is perpendicular to the permanent magnet positioning surface 100, namely the normal direction of the permanent magnet positioning surface 100.

In a specific application example, the heights of the protruding permanent magnet positioning surfaces 100 of the positioning blocks 3 are consistent, so that the distance between the primary 10 of the linear motor and the secondary of the linear motor can be periodically changed in the feeding direction, constant reluctance thrust is generated in the magnetic field alternating process, the positioning force and thrust fluctuation of the linear motor are reduced, and the positioning precision and repeated positioning precision of a feeding system are improved.

As shown in fig. 5a and 5b, each of the positioning blocks 3 may be formed by stacking magnetic conductive sheets 301, for example, silicon steel sheets, so as to facilitate processing. In a specific application example, each positioning block 3 is formed by stacking the magnetic conductive sheets 301 along the first direction b.

When the single sub-module 200 fails to satisfy the travel of the feeding system, as shown in fig. 7a, the number of the sub-modules 200 is more than two and are sequentially arranged along the linear direction a. The permanent magnet 2 on one side of one secondary module 200 is adjacent to the positioning block 3 on one side of the adjacent other secondary module 200, so that the situation that the magnetic poles of the permanent magnet 2 are reversed can be avoided through visual direct inspection, the splicing step of the magnetic yoke plate 1 is simplified, the installation efficiency is improved, and the secondary installation quality of the linear motor is guaranteed.

Fig. 7a shows a mounting manner in which two adjacent sub-modules 200 are correctly arranged, in which fig. 7a the permanent magnet 2 on one side of one sub-module 200 is adjacent to the positioning block 3 on the side of the other sub-module 200. Fig. 7b shows a mounting manner of the adjacent two sub-modules 200 arranged in error, in fig. 7b, the positioning block 3 on one side of one sub-module 200 is adjacent to the positioning block 3 on one side of the adjacent other sub-module 200, so that the mounting error can be rapidly judged by visual manner, and the error is avoided.

The invention also provides a linear motor which can comprise any of the linear motor secondary stages described above. In this example, since the linear motor adopts the secondary linear motor, the positioning blocks 3 are distributed at equal intervals, and the adjacent permanent magnets 2 are stopped and positioned on the same side of the linear direction a by the positioning blocks 3, so that the permanent magnets 2 can also be distributed at equal intervals in the linear direction a, the position arrangement precision of the permanent magnets 2 is improved, the position consistency of the permanent magnets 2 is ensured, the inconsistent positioning force and thrust of the linear motor at different positions due to the position deviation of the permanent magnets 2 is avoided, the increase of thrust fluctuation is avoided, the thrust fluctuation of the linear motor can be limited within the design range, the consistency of motor output is ensured, and the positioning precision and the repeated positioning precision of the linear feeding system are improved.

Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (9)

1. A linear motor secondary, characterized by: the magnetic yoke device comprises a secondary module (200), wherein the secondary module (200) comprises a magnetic yoke plate (1), a permanent magnet (2) and a positioning block (3);

the number of the permanent magnets (2) is more than two; the number of the positioning blocks (3) is equal to that of the permanent magnets (2), the two positioning blocks and the permanent magnets (2) are sequentially staggered on the magnetic yoke plate (1) along the linear direction (a), and the polarities of the two adjacent permanent magnets (2) are opposite;

wherein each positioning block (3) is distributed on the magnetic yoke plate (1) at equal intervals along the linear direction (a); the same side of each positioning block (3) along the straight line direction (a) is propped against the adjacent permanent magnet (2) so as to stop and position each permanent magnet (2) on the same side of the straight line direction (a).

2. The linear motor secondary of claim 1, wherein:

the magnetic yoke plate (1) is provided with positioning grooves (101), the number of the positioning grooves (101) is equal to that of the positioning blocks (3), and one ends (31) of the positioning blocks are inserted in the corresponding positioning grooves (101) in a one-to-one correspondence mode.

3. The linear motor secondary of claim 2, wherein:

each positioning groove (101) is of a groove body structure with the bottom width being larger than the opening width, and one end (31) of each positioning block is provided with an appearance shape consistent with the corresponding positioning groove (101).

4. A linear motor secondary according to claim 3, wherein:

each positioning groove (101) penetrates through two ends of the magnetic yoke plate (1) along a first direction (b), the first direction (b) is perpendicular to the linear direction (a), and one end (31) of each positioning block is inserted into the corresponding positioning groove (101) along the first direction (b).

5. The linear motor secondary according to any one of claims 1 to 4, wherein:

the magnetic yoke plate (1) is provided with a permanent magnet positioning surface (100), and the magnetic yoke plate (1) provides support for each permanent magnet (2) through the permanent magnet positioning surface (100);

each positioning block (3) is a magnetic conduction block and protrudes out of the permanent magnet positioning surface (100), and each positioning block (3) is used for magnetic conduction along the direction perpendicular to the permanent magnet positioning surface (100).

6. The linear motor secondary of claim 5, wherein:

the heights of the positioning blocks (3) protruding out of the permanent magnet positioning surfaces (100) are consistent.

7. The linear motor secondary of claim 5, wherein:

each positioning block (3) is formed by stacking magnetic conductive sheets (301).

8. The linear motor secondary according to any one of claims 1 to 4, 6, 7, wherein: the number of the secondary modules (200) is more than two, and the secondary modules are sequentially distributed along the linear direction (a);

wherein the permanent magnet (2) on one side of one sub-module (200) is adjacent to the positioning block (3) on the side of the adjacent other sub-module (200).

9. A linear motor, characterized in that: comprising a linear motor secondary according to any one of claims 1-8.