Linear motor

Abstract

The utility model discloses a linear motor, which comprises a shell with an accommodating cavity, a load plate connected with the shell in a sliding manner, and a first motor stator and a second motor stator which are arranged in the accommodating cavity side by side at an interval, the magnetic track mounting plate is arranged between the first motor stator and the second motor stator; the first magnetic track and the second magnetic track are mounted on the two opposite sides of the magnetic track mounting plate respectively, and the magnetic pole of the first magnetic track and the magnetic pole of the second magnetic track are oppositely arranged; and the connecting piece is fixed at one end of the magnetic track mounting plate, and the magnetic track mounting plate is fixedly connected with the load plate through the connecting piece. The heat generated in the working process of the magnetic track mounting plate is quickly dissipated outwards through the connecting piece, the heat is prevented from being transmitted to the load plate, errors caused by thermal expansion and cold contraction in the working process of the load plate can be reduced, and the working precision of the linear motor can be improved.

Description

Technical Field

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

[0002] like Figure 1 Figure 1 shows a schematic diagram of the three-dimensional structure of a conventional linear motor. Conventional linear motors are rod-shaped motors mounted within a housing. The rod-shaped motor comprises a rod-shaped motor stator 91 fixed to the inner wall of the housing and a rod-shaped motor mover 92 coaxially disposed with the rod-shaped motor stator 91. Load-bearing structures 93 for carrying loads are connected to the ends of the rod-shaped motor mover 92. Because there is no heat dissipation structure between the rod-shaped motor mover 92 and the rod-shaped motor stator 91, heat generated during operation can only be dissipated by the housing. The distances between the various parts of the cylindrical motor stator 91 and the housing vary, and the heat dissipation capacity of windings farther from the housing is poorer than that of windings closer to the housing. This results in heat accumulation in the coil windings of the motor stator 91, resulting in poor heat dissipation. This can easily cause the load-bearing structures 93 at both ends of the rod-shaped motor mover 92 to change in size due to thermal expansion and contraction, affecting the operating accuracy of the linear motor. Furthermore, it is difficult to prevent heat from being transferred through the load-bearing structure to the workpiece mounted on it, which can easily affect the machining accuracy of the workpiece. Utility Model Content

[0003] The utility model aims to solve the technical problem of low working precision caused by poor heat dissipation of linear motors in the prior art, and proposes a linear motor with compact structure, good heat dissipation effect and smooth operation.

[0004] The utility model provides a linear motor, comprising a housing having an accommodating cavity, a load plate slidably connected to the housing, and a first motor stator and a second motor stator arranged side by side and spaced apart in the accommodating cavity; the utility model also comprises: a magnetic rail mounting plate arranged between the first motor stator and the second motor stator; a first magnetic rail and a second magnetic rail respectively mounted on two opposite sides of the magnetic rail mounting plate, with the magnetic poles of the first magnetic rail and the magnetic poles of the second magnetic rail arranged oppositely; and a connecting piece fixed to one end of the magnetic rail mounting plate, wherein the magnetic rail mounting plate is fixedly connected to the load plate via the connecting piece.

[0005] In some preferred embodiments, the connector is provided with a plurality of cooling holes; the cooling holes include at least one first cooling hole penetrating the connector in a first direction, or / and a plurality of second cooling holes extending in a second direction.

[0006] In some preferred embodiments, the plurality of second cooling holes are connected to the first cooling holes.

[0007] In some preferred embodiments, the connecting member and the load plate are an integral structure; the lateral thickness of the connecting member in the direction of the lateral spacing between the first motor stator and the second motor stator is smaller than the lateral spacing between the first motor stator and the second motor stator, but greater than the lateral thickness of the magnetic rail mounting plate.

[0008] In some preferred embodiments, a limiting groove is provided on the top end surface of the connecting member, and a protrusion is provided on the bottom end surface of the load plate, and the protrusion is limitedly assembled in the limiting groove.

[0009] In some preferred embodiments, support plates are respectively extended from two opposite side walls of the housing toward the accommodating cavity, and two opposite sides of the load plate are respectively slidably connected to the corresponding support plates.

[0010] In some preferred embodiments, slide rail structures are provided between two opposite sides of the load plate and the corresponding support plates.

[0011] In some preferred embodiments, the first motor stator and the second motor stator are respectively fixed under one of the support plates, and a wire outlet slot is provided on each of the support plates.

[0012] In some preferred embodiments, a plurality of heat dissipation fins are provided on the outer side of the housing.

[0013] In some preferred embodiments, a limit block is provided at the bottom of the accommodating cavity, and the first motor stator and the second motor stator are respectively limited on two opposite sides of the limit block, and at least two outer side surfaces of each of the first motor stator and the second motor stator are arranged in contact with the accommodating cavity.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The linear motor disclosed in this utility model adopts a moving magnet drive method, resulting in a more rational overall structure. A magnetic rail mounting plate and first and second magnetic rails respectively fixed to the sides of the magnetic rail mounting plate serve as the linear motor's mover, freeing the mover from cable constraints and making it suitable for high-frequency reciprocating linear motion. Furthermore, a connector is provided at one end of the magnetic rail mounting plate, connecting the magnetic rail mounting plate to the load plate via the connector. The connector quickly dissipates heat generated during operation of the magnetic rail mounting plate, preventing heat transfer to the load plate. This reduces errors caused by thermal expansion and contraction of the load plate during operation, thereby improving the operating accuracy of the linear motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a linear motor in the prior art.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the linear motor of this application.

[0018] Figure 3It is a side structural diagram of the linear motor of the present application.

[0019] Figure 4 This is a schematic diagram of the exploded structure of the linear motor of this application.

[0020] Figure 5 It is a schematic diagram of the assembly structure of the load plate, magnetic rail mounting plate and connecting parts.

[0021] Figure 6 It is a side structural diagram when the magnetic rail mounting plate and the connecting parts are an integrated structure.

[0022] Figure 7 It is a structural diagram of the shell. DETAILED DESCRIPTION

[0023] To further illustrate the technical means and effects employed by this application to achieve its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of this application is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0024] Combine Figures 2 to 7 As shown, the linear motor disclosed in the present utility model specifically includes: a shell 1 with an accommodating cavity 10; a load plate 41 slidably connected to the shell 1; a first motor stator 21 and a second motor stator 22 arranged side by side in the accommodating cavity 10; a magnetic rail mounting plate 42 arranged between the first motor stator 21 and the second motor stator 22; a first magnetic rail 8 and a second magnetic rail 9 respectively mounted on two opposite sides of the magnetic rail mounting plate 42, and the magnetic poles of the first magnetic rail 8 and the magnetic poles of the second magnetic rail 9 are arranged opposite to each other; a connector 43 fixed to one end of the magnetic rail mounting plate 42, and the connector 43 is detachably connected to the load plate 41.

[0025] By fixing a connector 43 at one end of the magnetic rail mounting plate 42, the heat generated during the operation of the magnetic rail mounting plate 42 can be quickly dissipated to the outside by using the connector 43, thereby blocking the heat from being transferred to the load plate 41. This can reduce the error caused by thermal expansion and contraction of the load plate 41 during operation, which is beneficial to improving the working accuracy of the linear motor.

[0026] The linear motor disclosed in this utility model uses a moving magnet drive method. Specifically, a stationary first motor stator 21 drives the first magnetic rail 8, which in turn moves the magnetic rail mounting plate 42. A stationary second motor stator 22 drives the second magnetic rail 9, which in turn moves the magnetic rail mounting plate 42. In other words, the connector 43, magnetic rail mounting plate 42, first magnetic rail 8, and second magnetic rail 9 act as the linear motor's movers.

[0027] Moreover, since the magnetic poles of the first magnetic rail 8 and the magnetic poles of the second magnetic rail 9 are opposite to each other, the driving forces generated by the magnetic poles of the first magnetic rail 8 and the second magnetic rail 9 on the magnetic rail mounting plate 42 are in the same direction. The two work together to enable the magnetic rail mounting plate 42 to drive the load plate 41 to perform reciprocating linear motion as needed through the connecting member 43.

[0028] At the same time, since the magnetic poles of the first magnetic rail 8 are opposite to the magnetic poles of the second magnetic rail 9, when the first magnetic rail 8 and the second magnetic rail 9 act on the magnetic rail mounting plate 42 at the same time, the net external force acting on the magnetic rail mounting plate 42 is zero. Therefore, the structural strength requirements of the magnetic rail mounting plate 42 in the horizontal direction are low. Therefore, the thickness of the magnetic rail mounting plate 42 can be set to be smaller. A thinner magnetic rail mounting plate 42 can avoid a large amount of heat accumulation, which is conducive to faster transfer and dispersion of heat.

[0029] Furthermore, the first motor stator 21 and the second motor stator 22 are disposed within the housing 1 and correspondingly relative to the first magnetic rail 8 and the second magnetic rail 9, respectively. Both the first motor stator 21 and the second motor stator 22 include coil windings. Compared to the prior art, which places coil windings on the mover of a linear motor and requires cables to be connected to the mover, posing a severe challenge to the cable's service life during high-frequency reciprocating motion, the linear circuit of the present invention utilizes a magnetic rail as the mover, eliminating the need for cables. Therefore, there is no need to consider cable service life, making the present invention more suitable for high-frequency reciprocating linear motion.

[0030] The connecting member 43 is provided with a plurality of cooling holes. By providing the cooling holes, the contact area with the air can be greatly increased, the heat dissipation capacity of the magnetic rail mounting plate 42 can be improved, and the heat generated by the first magnetic rail 8 and the second magnetic rail 9 can be effectively blocked from being transferred to the load plate 41, thereby improving the working accuracy of the linear motor.

[0031] The cooling holes include at least one first cooling hole 431 penetrating the connector 43 in a first direction, and / or a plurality of second cooling holes 432 extending in a second direction.

[0032] like Figure 5 As shown, one or more first cooling holes 431 are arranged along the length of the connector 43; several second cooling holes 432 are arranged along the width of the connector 43, with each of the second cooling holes 432 communicating with the first cooling holes 431. This structure not only provides the connector 43 with a larger heat dissipation surface area, allowing external cool air to circulate through the first and second cooling holes 431, improving heat dissipation, but also reduces the mass of the connector 43, thereby reducing the total mass of the linear motor's rotor. This improves the linear motor's motion response and reduces its inertia.

[0033] The connector 43 and the load plate 41 are either integrally formed or assembled separately. Furthermore, the connector 43 has a transverse thickness in the direction of the transverse spacing between the first motor stator 21 and the second motor stator 22 that is smaller than the transverse spacing between the first motor stator 21 and the second motor stator 22, but larger than the transverse thickness of the magnetic rail mounting plate 42. This allows the connector 43 to fully utilize the transverse spacing between the first motor stator 21 and the second motor stator 22, resulting in a design with as large a size as possible to enhance heat dissipation.

[0034] In some embodiments, the magnetic rail mounting plate 42 , the connector 43 and the load plate 41 are an integrated structure.

[0035] In some embodiments, the magnetic rail mounting plate 42 is detachably connected to the load plate 41 via a connector 43. The advantage is that the magnetic rail mounting plate 42 needs to be made of magnetically conductive steel, while the load plate 41 used in conjunction with it is made of aluminum with a lower density, which can greatly reduce the total mass of the mover. The benefits brought about are: increasing the acceleration of the mover and reducing the influence of inertia in the movement of the mover.

[0036] The load plate 41 can be fixed to the connector 43 by any existing means, such as screws. Furthermore, a retaining groove 433 is provided on the top surface of the connector 43, and a protrusion 411 is provided on the bottom surface of the load plate 41. The protrusion 411 is retained within the retaining groove 433, thereby further strengthening the assembly structure between the load plate 41 and the connector 43.

[0037] Support plates 19 extend from opposite side walls of the housing 1 toward the accommodating cavity 10, and opposite sides of the load plate 41 are slidably connected to the corresponding support plates 19. For example, a slide rail structure 3 is provided between the two opposite sides of the load plate 41 and the corresponding support plates 19. The two guide rail structures 3 are provided on both sides of the load plate 41 and connected to the load plate 41, which facilitates a more stable movement of the load plate 41.

[0038] The slide rail structure 3 can be a cross-roller guide as shown in the accompanying drawings, or a combination of a slider and a guide rail, where the slider is mounted on the support plate 19 of the housing 1 and the guide rail is mounted on the load plate 41. The combination of a slider and a guide rail facilitates installation and makes the linear motor more suitable for high-speed motion scenarios.

[0039] In order to improve the strength of the support plate 19, a reinforcing plate 13 is provided between the outer end of the support plate 19 and the side plate of the housing 1. Figure 7 The reinforcing plate 13 is a separate fixed structure or an integrally formed structure relative to the housing 1 .

[0040] The first motor stator 21 and the second motor stator 22 are respectively fixed under one of the support plates 19 . A wire outlet slot 11 is provided on each support plate 19 , and the wires of the first motor stator 21 and the second motor stator 22 are routed through the wire outlet slot 11 .

[0041] Furthermore, a plurality of heat dissipation fins 13 are provided on the outer side of the housing 1. The heat generated by the first motor stator 21 and the second motor stator 22 is quickly dissipated to the outside through the plurality of heat dissipation fins 13 of the housing 1, and the heat dissipation effect is good.

[0042] A limit block 14 is provided at the bottom of the accommodating cavity 10 , and the first motor stator 21 and the second motor stator 22 are respectively limited on two opposite sides of the limit block 14 . The limit block 14 has a limiting function on the first motor 21 and the second motor 22 , and the limit block 14 also has the function of increasing the overall structural strength of the shell 1 .

[0043] Among them, several fixing holes can be set on the shell 1. After the first motor stator 21 and the second motor stator 22 are respectively inserted into the two sides of the limit block 14, the first motor stator 21 and the second motor stator 22 are respectively fixed in the shell 1 by using screws and other components through the fixing holes.

[0044] When the first motor stator 21 and the second motor stator 22 are respectively installed in the accommodating cavity 10 and are located on two opposite sides of the limit block 14, at least two outer side surfaces of the first motor stator 21 and the second motor stator 22 are respectively fitted with the accommodating cavity 10. For example, the bottom side surfaces and outer vertical side surfaces of the first motor stator 21 and the second motor stator 22 are respectively fitted with the inner side walls of the accommodating cavity 10, ensuring a good heat conduction area between the housing 1, which is conducive to allowing the heat generated by the first motor stator 21 and the second motor stator 22 to be quickly transferred to the housing 1 for heat dissipation.

[0045] In addition, a grating ruler 6 is fixed on one side of the load plate 41, and a reading head 7 that matches the grating ruler 6 is correspondingly provided on the housing 1, so that the reading head 7 reads the scale of the grating ruler 6 to determine the motion displacement of the linear motor.

[0046] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A linear motor comprising a housing (1) having a receiving cavity (10), a load plate (41) slidably connected to the housing (1), and a first motor stator (21) and a second motor stator (22) arranged side by side and spaced apart in the receiving cavity (10); characterized in that: Also includes: A magnetic rail mounting plate (42) is arranged between the first motor stator (21) and the second motor stator (22); The first magnetic track (8) and the second magnetic track (9) are respectively mounted on two opposite sides of the magnetic track mounting plate (42), and the magnetic poles of the first magnetic track (8) and the magnetic poles of the second magnetic track (9) are arranged opposite to each other; The connecting member (43) is fixed to one end of the magnetic rail mounting plate (42), and the magnetic rail mounting plate (42) is fixedly connected to the load plate (41) through the connecting member (43).

2. The linear motor according to claim 1, characterized in that: The connecting member (43) is provided with a plurality of cooling holes; the cooling holes include at least one first cooling hole (431) penetrating the connecting member (43) in a first direction, or / and a plurality of second cooling holes (432) extending in a second direction.

3. The linear motor according to claim 2, characterized in that: The plurality of second cooling holes (432) are all arranged in communication with the first cooling hole (431).

4. The linear motor according to claim 1, characterized in that: The connecting member (43) and the load plate (41) are an integral structure; the transverse thickness of the connecting member (43) in the transverse spacing direction between the first motor stator (21) and the second motor stator (22) is smaller than the transverse spacing between the first motor stator (21) and the second motor stator (22), but greater than the transverse thickness of the magnetic rail mounting plate (42).

5. The linear motor according to claim 1, characterized in that: The top end surface of the connecting member (43) is provided with a limiting groove (433), and the bottom end surface of the load plate (41) is provided with a protrusion (411), and the protrusion (411) is limitedly assembled in the limiting groove (433).

6. The linear motor according to claim 1, characterized in that: Two opposite side walls of the housing (1) extend outwards of support plates (19) towards the accommodating cavity (10), and two opposite sides of the load plate (41) are slidably connected to the corresponding support plates (19).

7. The linear motor according to claim 6, characterized in that: Slide rail structures (3) are provided between two opposite sides of the load plate (41) and the corresponding support plates (19).

8. The linear motor according to claim 6, characterized in that: The first motor stator (21) and the second motor stator (22) are respectively fixed below one of the support plates (19), and a wire outlet slot (11) is provided on each of the support plates (19).

9. The linear motor according to claim 1, characterized in that: A plurality of heat dissipation fins (13) are provided on the outer side surface of the housing (1).

10. The linear motor according to any one of claims 1 to 9, characterized in that: A limiting block (14) is provided at the bottom of the accommodating cavity (10), and the first motor stator (21) and the second motor stator (22) are respectively limited on two opposite sides of the limiting block (14), and at least two outer side surfaces of each of the first motor stator (21) and the second motor stator (22) are arranged to fit the accommodating cavity (10).

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