Linear motor rotor and linear motor thereof

Abstract

The utility model belongs to the field of linear motors, and particularly relates to a linear motor mover and a linear motor thereof, which comprise a mover shell, a motor coil assembly, a driver and an encoder reading head, one end of the motor coil assembly is fixedly connected to the rotor shell, and the other end protrudes out of the rotor shell; the rotor shell is provided with a cavity, the driver is arranged in the cavity, and the driver is electrically connected with the motor coil assembly; according to the linear motor mover, the driver, the encoder reading head and the motor coil assembly are integrated, and compared with a traditional linear motor mover, the number of wires is greatly reduced, the installation structure is simplified, the failure rate is reduced, and the reliability of the motor is improved. Wherein the driver is encapsulated in the cavity of the rotor shell through the pouring sealant, and meanwhile, a connecting line of the driver and the motor coil assembly is also fixed by the pouring sealant, so that the fixing stability of the driver and the connecting line of the driver and the motor coil assembly is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of linear motors, and in particular relates to a linear motor mover and a linear motor thereof. Background Art

[0002] Linear motors are motors that convert electrical energy directly into linear motion. They are widely used in automated production lines, precision positioning equipment, and other applications that require linear motion. Compared with traditional rotary motors, linear motors have the advantages of simple structure, fast response speed, and high control accuracy.

[0003] At present, the linear motor mover, driver, encoder and motor mover of the moving coil linear motor are usually separated, resulting in complex interfaces and a large number of wiring, which not only increases the complexity of installation, but also increases the manufacturing cost, and also increases the failure rate of the motor. When used in a vibrating or harsh environment, the split setting will be unstable, which will lead to performance degradation and affect the service life and accuracy of the linear motor. In recent years, there have also been some structures that fix the driver to the motor mover, such as the Chinese invention patent application "202210888043.2 An integrated flat linear motor structure", but its integration method is still to fix the driver directly to the motor mover through fasteners. The stability of its fixing method is general, and it is still unstable when used in a vibrating or harsh environment. In addition, this integration method will affect the heat dissipation effect due to the increase in compactness. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a linear motor mover and a linear motor which are fixed, stable and reliable and integrate a motor coil component, a driver and an encoder reading head into one body.

[0005] The utility model provides a linear motor mover, comprising a mover housing, a motor coil assembly, a driver and an encoder reading head;

[0006] One end of the motor coil assembly is fixedly connected to the mover housing, and the other end protrudes from the mover housing;

[0007] The mover housing is provided with a cavity, the driver is arranged in the cavity, and the driver is electrically connected to the motor coil assembly;

[0008] A potting glue is arranged in the cavity, which is used to pot the mover housing and the driver into one body.

[0009] Furthermore, one end of the motor coil assembly is inserted into the cavity and fixed to the inner wall of the mover housing, and the other end protrudes from the cavity of the mover housing;

[0010] The potting glue is used to pot the mover housing, the motor coil assembly and the driver into one body.

[0011] Furthermore, the motor coil assembly includes two fixing plates and a coil structure fixed between the two fixing plates;

[0012] A plurality of mounting seats are arranged at intervals at the bottom of the cavity, a plurality of mounting plates are arranged at intervals at the bottom of the two fixing plates, and the fixing plates are fastened to the corresponding mounting seats.

[0013] Furthermore, an embedding groove is provided on the upper surface of the mounting seat, and the bottom of a portion of the iron core in the coil structure is embedded in the embedding groove.

[0014] Furthermore, the motor coil assembly divides the cavity into a left cavity and a right cavity.

[0015] Furthermore, the motor coil assembly is arranged outside the cavity;

[0016] A through hole is provided at the bottom of the cavity, a threaded hole is provided at the end of the motor coil assembly, the fastener is a bolt, the screw head of the bolt is located in the cavity, and the screw rod passes through the through hole and is screwed to the threaded hole;

[0017] The potting glue covers the screw head.

[0018] Furthermore, the mover housing is provided with a cover plate at the opening of the cavity.

[0019] Furthermore, the encoder reading head is parallel or perpendicular to the protruding direction of the motor coil assembly relative to the mover housing.

[0020] Furthermore, a braking resistor is also arranged in the cavity, and the braking resistor is electrically connected to the driver.

[0021] Furthermore, the driver includes a plurality of circuit boards, and the plurality of circuit boards are electrically connected to each other.

[0022] The utility model also provides a linear motor, comprising a linear motor stator and the linear motor mover;

[0023] The linear motor stator comprises a bracket and a stator magnetic steel arranged on the bracket along the length direction of the bracket;

[0024] The motor coil assembly on the linear motor mover interacts with the stator magnet on the linear motor stator.

[0025] Furthermore, the encoder reading head is an inductive encoder reading head; the bracket is provided with an inductive encoder ruler;

[0026] The inductive encoder scale is composed of a plurality of plates joined together, and a seam is provided between two plates.

[0027] Furthermore, the linear motor further comprises a guide rail assembly, wherein the guide rail assembly comprises a linear guide rail arranged on the bracket and a slider arranged on the mover housing.

[0028] The beneficial effect of the utility model is that the utility model integrates the driver, encoder reading head and motor coil assembly into one, which greatly reduces the number of wiring, simplifies the installation structure, and reduces the failure rate compared to the traditional linear motor mover, wherein the driver is potted in the cavity of the mover housing by potting glue, and the connection line between the driver and the motor coil assembly is also fixed by potting glue, which ensures the fixed stability of the driver and the connection line between the driver and the motor coil assembly, greatly improves the stability and reliability of the linear motor mover, and improves the service life and vibration resistance. At the same time, the heat on the driver can be transferred to the mover housing through the potting glue for heat dissipation, so that the linear motor mover has a good heat dissipation effect and meets the performance requirements. Moreover, the above structure is applicable to both single-sided moving coil linear motors and double-sided moving coil linear motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 It is a structural schematic diagram of the double-sided moving coil linear motor in the utility model;

[0030] Attached Figure 2 It is a front cross-sectional view of the double-sided moving coil linear motor in the utility model;

[0031] Attached Figure 3 It is a structural schematic diagram of a linear motor mover in the structural schematic diagram of a double-sided moving coil linear motor in the utility model;

[0032] Attached Figure 4 This is a schematic diagram of the first angle structure of the utility model after the cover plate and the potting glue are hidden;

[0033] Attached Figure 5 This is a schematic diagram of the second angle structure of the utility model after the cover plate and the potting glue are hidden;

[0034] Attached Figure 6 This is a top view of the utility model after the cover plate and the potting glue are hidden;

[0035] Attached Figure 7 For attachment Figure 6 Upper AA section view;

[0036] Attached Figure 8 This is a schematic diagram of the structure at a third angle after the cover plate and the potting glue are hidden in the utility model;

[0037] Attached Fig. 9 For attachment Figure 8 The schematic diagram of the structure behind a fixed plate is hidden below;

[0038] Attached Fig.10 It is a structural schematic diagram of a single-sided moving coil linear motor in the utility model;

[0039] Attached Fig.11 It is a front cross-sectional view of the single-sided moving coil linear motor in the utility model;

[0040] Attached Fig.12 This is a schematic diagram of the structure of the unilateral moving coil linear motor in the utility model after the cover plate is hidden;

[0041] Attached Fig.13 It is a top view of the single-sided moving coil linear motor in the utility model;

[0042] Attached Fig.14 For attachment Fig.13 Upper BB section view;

[0043] Attached Fig.15 For attachment Fig.13 Upper CC section view;

[0044] Attached Fig.16 The utility model is a schematic diagram of the structure of the single-sided moving coil linear motor after the cover plate and the driver are hidden.

[0045] In the figure, 1- linear motor mover; 11- mover housing; 111- cavity; 1111- left cavity; 1112- right cavity; 1113- through hole; 1114- wiring hole; 112- mounting seat; 1121- fitting groove; 113- cover plate; 12- motor coil assembly; 121- fixing plate; 1211- mounting plate; 122- coil structure; 1221- iron core; 1222- coil; 123- threaded hole; 13- driver; 14- encoder reading head; 15- brake resistor; 16- potting glue; 2- linear motor stator; 21- bracket; 22- stator magnet; 23- encoder induction board; 3- guide rail assembly; 31- linear guide rail; 32- slider. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] As attached Figure 1 -Attached Fig.16 As shown, the utility model provides a linear motor mover 1, comprising a mover housing 11, a motor coil assembly 12, a driver 13 and an encoder reading head 14;

[0052] One end of the motor coil assembly 12 is fixedly connected to the mover housing 11, and the other end protrudes from the mover housing 11;

[0053] The mover housing 11 is provided with a cavity 111, the driver 13 is arranged in the cavity 111, and the driver 13 is electrically connected to the motor coil assembly 12;

[0054] The cavity 111 is provided with a potting compound 16 for potting the mover housing 11 and the driver 13 together.

[0055] The utility model integrates the driver 13, the encoder reading head 14 and the motor coil assembly 12 into one body, which greatly reduces the number of wiring, simplifies the installation structure and reduces the failure rate compared with the traditional linear motor mover 1, wherein the driver 13 is potted in the cavity 111 of the mover housing 11 by potting glue 16, and the connection line between the driver 13 and the motor coil assembly 12 is also fixed by the potting glue 16, which ensures the fixing stability of the driver 13 and the connection line between the driver 13 and the motor coil assembly 12, greatly improving the stability and reliability of the linear motor mover 1, and improving the service life and vibration resistance. At the same time, the heat on the driver 13 can be transferred to the mover housing 11 through the potting glue 16 for heat dissipation, so that the linear motor mover 1 has a good heat dissipation effect and ensures the performance requirements. Moreover, the above structure is applicable to both single-sided moving coil linear motors and double-sided moving coil linear motors.

[0056] In one embodiment, one end of the motor coil assembly 12 is inserted into the cavity 111 and fixed to the inner wall of the mover housing 11, and the other end protrudes from the cavity 111 of the mover housing 11;

[0057] The potting compound 16 is used to pot the mover housing 11, the motor coil assembly 12 and the driver 13 together. In the present embodiment, a portion of the motor coil assembly 12 is directly potted in the cavity 111, which greatly improves the fixing stability of the motor coil assembly 12 and the mover housing 11, and further improves the overall life and vibration resistance. Moreover, a portion of the motor coil assembly 12 is covered by the potting compound 16 in the cavity 111, so that the motor coil assembly 12 can also conduct heat through the potting compound 16 in the cavity 111, thereby improving the heat dissipation effect of the motor coil assembly 12.

[0058] In one embodiment, the motor coil assembly 12 includes two fixed plates 121 and a coil structure 122 fixed between the two fixed plates 121; wherein the coil structure 122 includes a plurality of iron cores 1221 arranged at intervals and coils 1222 arranged on an even number of iron cores 1221, and both ends of each coil 1222 are electrically connected to the driver 13. Preferably, a connection structure is directly provided on one of the fixed plates 121, and each coil 1222 is connected to the connection structure on the fixed plate 121, and the connection structure is electrically connected to the driver 13, so that both ends of each coil 1222 are electrically connected to the driver 13. Of course, each coil 1222 can also be directly electrically connected to the driver 13 at both ends. The coil structure 122 is clamped and fixed by two fixed plates 121, which can ensure the fixing stability and straightness of the coil structure 122. Several mounting seats 112 are arranged at intervals at the bottom of the cavity 111, and several mounting plates 1211 are arranged at intervals at the bottom of the two fixing plates 121. The fixing plates 121 are fastened to the corresponding mounting seats 112. In this embodiment, the motor coil assembly 12 and the mover housing 11 are initially fixed before the cavity 111 is potted to ensure the relative position of the motor coil assembly 12 and the mover housing 11 during and after the potting process, thereby improving the installation accuracy of the two. The mounting plate 1211 arranged at the bottom of the fixing plate 121 is fixed to the corresponding mounting seat 112 to facilitate the installation of the fixing plate 121 and the mounting seat 112. The mounting plate 1211 is preferably fastened to the mounting seat 112 by fasteners, such as bolts, rivets and other fasteners. Of course, the mounting plate 1211 can also be fixed to the mounting seat 112 in other ways, such as welding, plug-in or snap-on connection. The specific installation method can be selected according to actual needs. The two opposite mounting plates 1211 of the two opposite fixing plates 121 clamp and fix a mounting seat 112 relatively.

[0059] In one embodiment, the surfaces of the two fixing plates 121 are coated with copper, so as to enhance the heat conduction to the coil structure 122 and strengthen the heat dissipation path.

[0060] In one embodiment, an engaging groove 1121 is provided on the upper surface of the mounting seat 112, and the bottom of at least part of the iron core 1221 in the coil structure 122 is engaged with the engaging groove 1121. Preferably, the bottom of the iron core 1221 without the coil 1222 is engaged with the engaging groove 1121. In this embodiment, the installation positioning of the coil structure 122 and the mounting seat 112 can be provided to ensure that the positions of the two are accurate after installation, which is convenient for accurately docking the coil structure 122 with the mounting seat 112, facilitating the fastening of the fixing plate 121 and the mounting seat 112, and improving the fixing stability of the coil structure 122 after potting, thereby improving the bearing capacity of the linear motor mover 1. Preferably, the mounting seat 112 and the mover housing 11 are integrally formed and are both made of good thermal conductive materials. At this time, the iron core 1221 engaged with the engaging groove 1121 can directly dissipate heat to the outside through the mounting seat 112 and the mover housing 11, further enhancing the heat dissipation effect of the coil structure 122.

[0061] In one of the embodiments, the motor coil assembly 12 divides the cavity 111 into a left cavity 1111 and a right cavity 1112, so that the cross-section of the motor coil assembly 12 and the mover housing 11 is a T-shaped structure. In this embodiment, the cavity 111 is divided into two independent cavities, and the driver 13 and other circuit boards can be reasonably arranged. For example, the driver 13 is arranged in one of the cavities, and the brake resistor 15 and the motor terminal board are arranged in another cavity, which can reduce the mutual influence of heat sources, improve the heat dissipation efficiency, and achieve reasonable heat dissipation.

[0062] In another embodiment, referring to the attached Fig.10 -Attached Fig.16 , the motor coil assembly 12 is fixed to the outside of the cavity 111 by fasteners. In this embodiment, a connection hole 1114 is provided on the outer wall of the rotor housing 11, which penetrates into the cavity 111, so as to electrically connect the multiple coils 1222 on the motor coil assembly 12 with the driver 13 in the cavity 111. In this embodiment, the motor coil assembly 12 is arranged outside the rotor housing 11, which can simplify the arrangement difficulty of the motor coil assembly 12 and improve the assembly efficiency. Preferably, a through hole 1113 is provided at the bottom of the cavity 111, and a threaded hole 123 is provided at the end of the motor coil assembly 12. The fastener is a bolt, and the screw head of the bolt is located in the cavity 111. The screw passes through the through hole 1113 and is screwed to the threaded hole 123. In this embodiment, the motor coil assembly 12 and the rotor housing 11 are fixed by bolts, and the installation is simple and reliable, which improves the assembly efficiency;

[0063] The potting glue 16 covers the screw head, that is, the potting glue 16 in the cavity 111 can also lock the fastener to prevent the fastener from loosening, so that the fixation of the mover housing 11 and the motor coil assembly 12 is permanent.

[0064] In one of the embodiments, the mover housing 11 is provided with a cover plate 113 at the opening of the cavity 111. Preferably, the cover plate 113 is detachably connected to the opening of the cavity 111 via fasteners, thereby sealing and covering the potting glue 16, which improves the aesthetics on the one hand and helps dissipate the heat of the potting glue 16 on the other.

[0065] In one embodiment, the encoder reading head 14 is parallel or perpendicular to the protruding direction of the motor coil assembly 12 relative to the mover housing 11 .

[0066] Reference Figure 1 -Attached Figure 6 When the encoder reading head 14 is perpendicular to the protruding direction of the motor coil assembly 12 relative to the mover housing 11, the encoder reading head 14 can be directly attached to the mover housing 11. At this time, the linear motor stator 2 and the mover housing 11 are provided with an encoder sensing plate 23 on the corresponding fitting surface. The encoder reading head 14 and the encoder sensing plate 23 are horizontally relatively parallel and aligned, which has the advantages of avoiding interference from foreign objects, being beautiful, and improving anti-interference. At this time, the encoder reading head 14 can be directly encapsulated in the mover housing 11 through the encapsulation glue 16, or it can be detachably connected with fasteners.

[0067] Reference Fig.10 and attached Fig.14 When the encoder reading head 14 is parallel to the protruding direction of the motor coil assembly 12 relative to the mover housing 11, the encoder reading head 14 is vertically mounted on the mover housing 11, so that the encoder reading head 14 and the encoder sensing plate 23 are vertically aligned in parallel. At this time, the encoder reading head 14 is fixed to the mover housing 11 by fasteners.

[0068] In one of the embodiments, a Hall return to zero detection sensor may be integrated into the driver 13 to improve the accuracy of position detection.

[0069] In one of the embodiments, a braking resistor 15 is further provided in the cavity 111 , and the braking resistor 15 is electrically connected to the driver 13 . In this embodiment, the braking resistor 15 is directly integrated into the linear motor mover 1 , so as to further improve the integration of the equipment and simplify the number of line connections.

[0070] In one embodiment, the driver 13 includes multiple circuit boards, for example, two circuit boards can be arranged longitudinally, and the multiple circuit boards are electrically connected to each other. Among them, the multiple circuit boards at least include a main control board, a power board, and a power supply board. In this embodiment, the driver 13 is reasonably divided into boards, and arranged in a staggered manner at high and low levels to solve the height space limitation. The multiple circuit boards are connected by pins.

[0071] The utility model also provides a linear motor, comprising a linear motor stator 2 and a linear motor mover 1;

[0072] The linear motor stator 2 includes a bracket 21 and a stator magnet 22 arranged on the bracket 21 along the length direction of the bracket 21;

[0073] The motor coil assembly 12 on the linear motor mover 1 interacts with the stator magnet 22 on the linear motor stator 2 to enable the linear motor mover 1 to move along the length direction of the linear motor stator 2 .

[0074] In one embodiment, the encoder reading head 14 is an inductive encoder reading head, and an encoder sensing plate 23 is provided on the bracket 21. The encoder sensing plate 23 is an inductive encoder scale. The inductive encoder scale corresponds to the encoder reading head 14 on the linear motor mover 1. The inductive encoder scale is composed of a plurality of plates spliced ​​together, and there is a seam between two plates. The seam can be temperature compensated to avoid deformation of the plate caused by thermal expansion and contraction. In this embodiment, the inductive encoder has the advantages of strong anti-interference ability, no influence of light, and compact structure. Of course, the encoder can also use other encoders, such as a grating encoder.

[0075] In one embodiment, the linear motor further includes a guide rail assembly 3, wherein the guide rail assembly 3 includes a linear guide rail 31 disposed on the bracket 21 and a slider 32 disposed on the mover housing 11. In this embodiment, the guide rail assembly 3 can limit the moving direction of the linear motor mover 1 and the linear motor stator 2, and provide a moving guide function.

[0076] In one embodiment, referring to the attached Figure 1 -Attached Fig. 9 , the stator magnetic steel 22 is correspondingly provided with two groups, at this time, the motor coil assembly 12 on the linear motor mover 1 is arranged between the two groups of stator magnetic steel 22, and the motor coil assembly 12 interacts with the two groups of stator magnetic steel 22: forming a double-sided moving coil linear motor. In this embodiment, the motor coil assembly 12 has two parallel motor air gaps and two-sided stator magnetic steel 22, which can reduce the normal force of the motor.

[0077] In one embodiment, referring to the attached Fig.10 -Attached Fig.16, the stator magnetic steel 22 is only provided in one group, and at this time, the motor coil assembly 12 on the linear motor mover 1 is arranged opposite to the stator magnetic steel 22 to form a unilateral moving coil linear motor.

[0078] The above is only an embodiment and does not limit the present invention in any way. Any person skilled in the art can make many possible changes, modifications or modifications to the present invention without departing from the scope of the present invention by using the above disclosed technical contents. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the present invention should fall within the scope of protection of the present invention.

Claims

1. A linear motor mover, characterized in that: It comprises a mover housing (11), a motor coil assembly (12), a driver (13) and an encoder reading head (14); One end of the motor coil assembly (12) is fixedly connected to the mover housing (11), and the other end protrudes from the mover housing (11); The mover housing (11) is provided with a cavity (111), the driver (13) is arranged in the cavity (111), and the driver (13) is electrically connected to the motor coil assembly (12); A potting glue (16) is arranged in the cavity (111) and is used to pot the mover housing (11) and the driver (13) together.

2. The linear motor mover according to claim 1, characterized in that: One end of the motor coil assembly (12) is inserted into the cavity (111) and fixed to the inner wall of the mover housing (11), and the other end protrudes from the cavity (111) of the mover housing (11); The potting glue (16) is used to pot the mover housing (11), the motor coil assembly (12) and the driver (13) into one body.

3. The linear motor mover according to claim 2, characterized in that: The motor coil assembly (12) comprises two fixing plates (121) and a coil structure (122) fixed between the two fixing plates (121); A plurality of mounting seats (112) are arranged at intervals at the bottom of the cavity (111), a plurality of mounting plates (1211) are arranged at intervals at the bottom of the two fixing plates (121), and the fixing plates (121) are fastened to the corresponding mounting seats (112).

4. The linear motor mover according to claim 3, characterized in that: An embedding groove (1121) is provided on the upper surface of the mounting seat (112), and the bottom of a portion of the iron core (1221) in the coil structure (122) is embedded in the embedding groove (1121).

5. The linear motor mover according to claim 2, characterized in that: The motor coil assembly (12) divides the cavity (111) into a left cavity (1111) and a right cavity (1112).

6. The linear motor mover according to claim 1, characterized in that: The motor coil assembly (12) is arranged outside the cavity (111); A through hole (1113) is provided at the bottom of the cavity (111), a threaded hole (123) is provided at the end of the motor coil assembly (12), the fastener is a bolt, the screw head of the bolt is located in the cavity (111), and the screw rod passes through the through hole (1113) and is threadedly connected with the threaded hole (123); The potting glue (16) covers the screw head.

7. The linear motor mover according to any one of claims 1 to 6, characterized in that: The mover housing (11) is provided with a cover plate (113) at the opening of the cavity (111).

8. The linear motor mover according to any one of claims 1 to 6, characterized in that: The encoder reading head (14) is parallel or perpendicular to the protruding direction of the motor coil assembly (12) relative to the mover housing (11).

9. The linear motor mover according to any one of claims 1 to 6, characterized in that: A braking resistor (15) is also provided in the cavity (111), and the braking resistor (15) is electrically connected to the driver (13).

10. The linear motor mover according to any one of claims 1 to 6, characterized in that: The driver (13) comprises a plurality of circuit boards, and the plurality of circuit boards are electrically connected to each other.

11. A linear motor, characterized in that: It comprises a linear motor stator (2) and a linear motor mover (1) according to any one of claims 1 to 10; The linear motor stator (2) comprises a bracket (21) and a stator magnetic steel (22) arranged on the bracket (21) along the length direction of the bracket (21); The motor coil assembly (12) on the linear motor mover (1) interacts with the stator magnetic steel (22) on the linear motor stator (2).

12. The linear motor according to claim 11, characterized in that: The encoder reading head (14) is an inductive encoder reading head; the bracket (21) is provided with an inductive encoder scale; The inductive encoder scale is composed of a plurality of plates joined together, and a seam is provided between two plates.

13. The linear motor according to claim 11, characterized in that: It also includes a guide rail assembly (3), wherein the guide rail assembly (3) includes a linear guide rail (31) arranged on a bracket (21) and a slider (32) arranged on a mover housing (11).

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