A traction linear motor

Abstract

The present invention provides a traction linear motor, wherein the traction linear motor comprises: a motor body and a coil; a plurality of grooves are longitudinally arranged on one side of the motor body, each groove being capable of laterally extending through the motor body; the lateral widths of both ends of the motor body are smaller than the lateral width of the middle portion of the motor body; the two ends of the motor body are the two ends of the motor body in the longitudinal direction, and the middle portion of the motor body is the portion between the two ends of the motor body; the coil passes through the groove and is wound around the motor body. The traction linear motor provided by the embodiment of the present invention, because the lateral widths of the two longitudinal ends of the motor body are smaller than the lateral width of the middle portion, can be extended and passed through the bogie support arm of existing medium and low-speed maglev trains without changing the structure of the bogie. This can directly reduce the longitudinal end effect produced by a single traction linear motor and improve the traction force of the single traction linear motor.

Description

Technical Field

[0001] The present invention relates to the technical field of traction motors, and in particular to a traction linear motor. Background Art

[0002] Although the existing medium- and low-speed maglev trains in operation have advantages such as low noise and strong climbing ability, the traditional linear motors are restricted by the bogie structure (such as the support arm) when installed on the bogie of the maglev train, resulting in limited spatial dimensions of the linear motors and limited motor traction, which in turn limits the train's traction capacity and cannot meet the requirements of higher-speed operation. Summary of the Invention

[0003] In order to solve the above problems, an embodiment of the present invention aims to provide a traction linear motor.

[0004] An embodiment of the present invention provides a traction linear motor, comprising: a motor body and a coil; a plurality of grooves are arranged longitudinally on one side of the motor body, and each of the grooves can pass through the motor body laterally; the lateral widths of both ends of the motor body are smaller than the lateral width of the middle part of the motor body; the two end parts of the motor body are the two end parts in the longitudinal direction of the motor body, and the middle part of the motor body is the part between the two end parts of the motor body; the coil passes through the grooves and is wound around the motor body.

[0005] Optionally, the coil includes: a first coil and a second coil; the first coil is wound in a groove corresponding to the middle of the motor body; the second coil is wound in grooves corresponding to both ends of the motor body; the first coil and the second coil are wound in different ways.

[0006] Optionally, the first coil includes a lapped coil, and the second coil includes a concentric coil; or, the first coil includes a concentric coil, and the second coil includes a lapped coil.

[0007] Optionally, the number of layers of the first coil and the second coil is at least two, and the number of layers of the first coil is different from the number of layers of the second coil.

[0008] Optionally, when the first coil is a concentric coil, the number of layers of the first coil is greater than the number of layers of the second coil.

[0009] Optionally, the first coil has three layers, and the second coil has two layers.

[0010] Optionally, when the first coil is a stacked coil, the number of layers of the first coil is smaller than the number of layers of the second coil.

[0011] Optionally, the first coil has two layers, and the second coil has three layers.

[0012] Optionally, the material of the coil includes copper and / or aluminum.

[0013] Optionally, the longitudinal widths of both end portions of the motor body are the same, and the sum of the longitudinal widths of the both end portions of the motor body is smaller than the longitudinal width of the middle portion of the motor body.

[0014] Optionally, the depth of each of the grooves is the same.

[0015] Optionally, the transverse widths of both ends of the motor body are the same.

[0016] Optionally, the motor body is made of iron silicon steel sheet.

[0017] In the solution provided by the first aspect of the embodiment of the present invention, since the lateral width of the longitudinal ends of the motor body is smaller than the lateral width of the middle part, the traction linear motor can be extended and passed through the bogie support arm without changing the existing medium and low speed maglev train bogie structure, thereby directly reducing the longitudinal end effect generated by the single traction linear motor and improving the traction force of the single traction linear motor; in addition, since the length of the single traction linear motor is increased, the interval between the two traction linear motors on the two bogies connected longitudinally is reduced, and the length of the equivalent motor formed by the two traction linear motors is increased, thereby reducing the longitudinal end effect of the equivalent motor, so that the equivalent motor (the traction linear motors on the two connected bogies) has a sufficiently strong traction capacity. The traction linear motor has a reliable structure, is easy to install and maintain, and can perfectly adapt to the medium and low speed maglev train bogie structure with a speed of up to 160 kilometers per hour.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A top view of a traction linear motor provided by an embodiment of the present invention is shown;

[0021] Figure 2 A side view of a traction linear motor provided by an embodiment of the present invention is shown;

[0022] Figure 3 A top view of a "traction linear motor having a first coil and a second coil" provided by an embodiment of the present invention is shown;

[0023] Figure 4 A top view of a "traction linear motor in which the first coil is a stacked coil and the second coil is a concentric coil" provided by an embodiment of the present invention is shown;

[0024] Figure 5 A top view of a "traction linear motor in which the first coil is a concentric coil and the second coil is a stacked coil" provided by an embodiment of the present invention is shown;

[0025] Figure 6 A side view of a "traction linear motor with two layers of first coils and three layers of second coils" provided by an embodiment of the present invention is shown;

[0026] Figure 7 A side view of a "traction linear motor with three layers of first coils and two layers of second coils" provided by an embodiment of the present invention is shown.

[0027] icon:

[0028] 1-motor body, 2-coil, 3-groove, 21-first coil, 22-second coil. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0031] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The maximum operating speed of existing low- and medium-speed maglev trains is less than 120 km / h, typically running at 100 km / h, which is relatively low. However, with the deepening of my country's economic development and the increasing trend of regional integration, the demand for urban rail transportation between the central urban areas of large cities and their suburbs, outskirts, and surrounding towns is increasing. However, the operating speed of these low- and medium-speed maglev trains will not be able to meet the higher speed standards. Therefore, it is necessary to improve the traction linear motors of these low- and medium-speed maglev trains to increase their operating speed.

[0033] However, during the improvement process, the inventors discovered that the traction linear motors of existing medium and low-speed maglev trains adopt an on-board short stator method, and their structure is an equal-stack structure. For example, the traction linear motor can be regarded as a rectangular structure as a whole, and the traction linear motor has equal width in the transverse direction. However, traction linear motors with this type of structure will be subject to the structural limitations of the bogies in the vehicle. For example, the traction linear motors installed on different bogies have support arms at both ends of the bogie, which causes the traction linear motors with this equal-stack structure to be unable to pass through the support arms at both ends of the bogie, so that the length of the traction linear motor can only be set to the length between the support arms at both ends of the bogie; this leads to a larger interval between the traction linear motors on the two bogies arranged in the longitudinal direction of each car. Under high-speed operation conditions, the longitudinal end effect of the traction linear motor with limited length is obvious, which increases the additional loss of the traction linear motor and reduces its traction force and work efficiency.

[0034] Therefore, in order to overcome the above-mentioned defects, an embodiment of the present invention provides a traction linear motor, see Figure 1 and Figure 2 As shown, the traction linear motor includes: a motor body 1 and a coil 2; a plurality of grooves 3 are arranged longitudinally on one side of the motor body 1 ( Figure 1 Not shown, see Figure 2 As shown in the figure), each groove 3 can pass through the motor body 1 horizontally; the lateral width of the two end portions of the motor body 1 is smaller than the lateral width of the middle portion of the motor body 1; the two end portions of the motor body 1 are the two end portions in the longitudinal direction of the motor body 1, and the middle portion of the motor body 1 is the portion between the two end portions of the motor body 1; the coil 2 passes through the groove 3 and is wound around the motor body 2.

[0035] In the embodiment of the present invention, since the traction linear motor is a component fixedly installed in the rail vehicle, the embodiment describes the direction of the traction linear motor according to the transverse and longitudinal directions of the rail vehicle; wherein the longitudinal direction refers to the direction from the front of the vehicle to the rear of the vehicle, and the transverse direction refers to the direction perpendicular to the longitudinal direction. Figure 1 This is a top view of the traction linear motor, where the up-down direction represents the horizontal direction and the left-right direction represents the vertical direction.

[0036] Among them, on one side of the motor body 1 (such as Figure 2 The lower side of the motor body 1 is shown. Figure 1 (not shown) is provided with a plurality of grooves 3, which are arranged in sequence along the longitudinal direction of the traction linear motor. Such a structure makes it possible for a "tooth" to exist between every two adjacent grooves 3. The "tooth" is also a part of the motor body 1. In the embodiment of the present invention, each "tooth" is referred to as a tooth portion. The motor body 1 is as follows Figure 2 The comb tooth structure shown. The coil 2 in the embodiment of the present invention can pass through the groove 3 and be wound on the tooth portion of the motor body 1, that is, the coil 2 can pass through the groove 3 and be wound on the motor body 1, so that the motor body 1 and the coil 2 are combined into an integrated structure. When the train is running, the magnetic field formed after the coil 2 is energized is inductively coupled to the F rail on the ground (that is, the rail surface with an aluminum plate attached to the surface) to generate the traction force of the train. Optionally, the material of the coil 2 includes copper and / or aluminum, and the embodiment of the present invention can be selected based on actual needs (such as installation space or cost, etc.).

[0037] Each groove 3 is a groove that runs through the motor body 1 in the transverse direction. For example, the length of each groove 3 (such as the length of the groove 3 in the transverse direction of the motor body 1) is consistent with the transverse width corresponding to its position (the transverse width of the motor body 1). Optionally, the depth of each groove 3 is the same. For example, each groove 3 is formed on the motor body 1 along its opening direction (such as the transverse direction of the motor body 1). Figure 2 The height of the lower side of the motor body 1 is the same, such a structure makes the height of each tooth portion of the motor body 1 (such as Figure 2 The height of the middle tooth portion extending downward from the lower side of the motor body 1 is consistent, which can make the structure of the traction linear motor more regular and convenient for manufacturing and installation. Optionally, the material of the motor body 1 is ferrous silicon steel sheet. Among them, the silicon steel sheet is usually a sheet with an insulating paint film and a thickness of 0.5 mm. It is a silicon-iron soft magnetic alloy with extremely low carbon content. When mixed with iron, it can increase the resistivity and maximum magnetic permeability of iron, and reduce coercive force, core loss (iron loss) and magnetic aging. The embodiment of the present invention uses ferrous silicon steel sheet as the material of the motor body 1, which has better effect.

[0038] In the embodiment of the present invention, the motor body 1 can be divided into the middle part of the motor body 1 and the end parts of the motor body 1 according to the installation direction (longitudinal direction) of the traction linear motor; wherein, the motor body 1 has two end parts, and for the convenience of description in the embodiment of the present invention, the two end parts are uniformly referred to as the two end parts of the motor body 1. In the embodiment of the present invention, the two end parts of the motor body 1 are the two end parts located in the longitudinal direction of the motor body 1, and the middle part of the motor body 1 is the part located between the two end parts of the motor body 1, for example, the middle part of the motor body 1. See Figure 1 As shown, the lateral width of the two ends of the motor body 1 (as shown Figure 1 The d2 shown is smaller than the horizontal width of the middle part of the motor body 1 (as shown in FIG. Figure 1 As shown in d1), the traction linear motor does not have a traditional uniform stacking thickness structure, but rather exhibits a non-uniform stacking thickness structure that is wide in the middle and narrow at both ends. This allows the two ends of the motor body 1 to pass through the support arms of the medium- and low-speed maglev train bogie, thereby extending the traction linear motor. Optionally, the lateral widths of the motor body 1 are the same at both ends; for example, the lateral widths of the motor body 1 at both ends are uniform and smaller than the lateral width of the middle portion of the motor body 1, allowing the motor to smoothly pass through the support arms of the same specifications at both ends of the bogie (such as the two ends of the support arms with the same size at the hollowed-out portion in the middle), thus being more compatible with the bogie.

[0039] The traction linear motor provided in the embodiment of the present invention has a smaller transverse width at both ends of the motor body 1 than at the middle, so that the traction linear motor can be extended and passed through the bogie support arm without changing the existing medium and low speed maglev train bogie structure, thereby directly reducing the longitudinal end effect generated by a single traction linear motor and improving the traction force of the single traction linear motor; in addition, since the length of the single traction linear motor is increased, the interval between the two traction linear motors on the two bogies connected longitudinally is reduced, and the length of the equivalent motor formed by the two traction linear motors is increased, thereby reducing the longitudinal end effect of the equivalent motor, so that the equivalent motor (the traction linear motors on the two connected bogies) has a sufficiently strong traction capacity. The traction linear motor has a reliable structure, is easy to install and maintain, and can perfectly adapt to the medium and low speed maglev train bogie structure with a speed increase to 160 kilometers per hour.

[0040] Alternatively, see Figure 3 As shown, the coil 2 includes: a first coil 21 and a second coil 22; the first coil 21 is wound in the corresponding groove 3 in the middle of the motor body 1; the second coil 22 is wound in the corresponding grooves 3 at both ends of the motor body 1; the winding methods of the first coil 21 and the second coil 22 are different.

[0041] Normally, the coils wound on the traction linear motors of medium and low-speed maglev trains adopt a single winding method, that is, the same traction linear motor only adopts one winding method for winding the coils. Such a single winding method makes it impossible to fully utilize the limited installation space of the motor, and the overall weight is large, which is not conducive to improving the traction force. However, the traction linear motor provided by the embodiment of the present invention can simultaneously adopt two different winding methods to wind the coil 2, that is, the coil 2 in the embodiment of the present invention includes a first coil 21 and a second coil 22. Among them, the first coil 21 is a coil wound on the middle part of the motor body 1, that is, the first coil 21 can pass through the groove 3 corresponding to the middle position of the motor body 1, and be wound on the teeth on both sides of the groove 3; the second coil 22 is a coil wound on both ends of the motor body 1, for example, the second coil 22 can be wound on any end of the motor body 1, pass through the groove 3 corresponding to the end position, and be wound on the teeth on both sides of the groove 3. The traction linear motor provided by the embodiment of the present invention can adopt two different coil winding methods at the same time, which is more diversified in the coil winding method, so that the coil 2 can be wound according to actual needs; and by planning different winding methods at different positions of the motor body 1, the advantages of the two winding methods can be combined, weakening the defects brought by a single winding method, thereby making full use of the motor installation space and maximizing the motor traction force.

[0042] Alternatively, see Figure 4 As shown, the first coil 21 includes a stacked coil and the second coil 22 includes a concentric coil; or, see Figure 5 As shown, the first coil 21 comprises a concentric coil, and the second coil 22 comprises a lapped coil.

[0043] The two different winding methods of the coil 2 are winding in an overlapping manner and winding in a concentric manner. Figure 4 As shown, the first coil 21 wound in the middle of the motor body 1 is a lapped coil, and the second coils 22 wound at both ends of the motor body 1 are concentric coils; or Figure 5As shown, the first coil 21 wound in the middle of the motor body 1 is a concentric coil, and the second coil 22 wound at both ends of the motor body 1 are lapped coils. Among them, since the lapped winding method will cause the coils 2 to cross and overlap on both sides of the traction linear motor, its manufacturing process is relatively complicated and the lateral width dimension will be larger; while the concentric method will not cause the coils 2 to cross and overlap on both sides of the traction linear motor, and its manufacturing process is relatively simple compared to the lapped winding method, the concentric method will cause the groove 3 for embedding the coil to be deeper, which will increase the overall weight of the traction linear motor. Therefore, the embodiment of the present invention can combine the above two winding methods of the coil 2, such as combining the advantages of the first coil 21 and the second coil 22, and combining the structure of the motor body 1, to plan the winding method of the coil 2 on the motor body 1, while ensuring that the process manufacturing is not difficult to implement, maximize the use of the motor installation space and improve the motor traction force.

[0044] Alternatively, see Figure 6 and Figure 7 As shown, the number of layers of the first coil 21 and the second coil 22 are both at least two, and the number of layers of the first coil 21 is different from the number of layers of the second coil 22 .

[0045] In the traction linear motor provided by the embodiment of the present invention, not only can the winding methods of the coil 2 be mixed and matched in two ways, but the number of layers of the coil 2 can also be distributed differently according to the different positions where it is wound (such as whether the coil 2 is the first coil 21 or the second coil 22), that is, the number of layers of the first coil 21 wound in the middle of the motor body 1 is different from the number of layers of the second coil 22 wound at both ends of the motor body 1. Among them, both the first coil 21 and the second coil 22 are wound in at least two layers, that is, no matter which winding method the coil 2 is wound in, and no matter whether the position where the coil 2 is wound is the middle of the motor body 1 or its two ends, the coil 2 is at least two layers. For example, in the traction linear motor, the number of layers of the first coil 21 can be 2 layers, and the number of layers of the second coil 22 can be 3 layers (such as Figure 6 Alternatively, in the traction linear motor, the number of layers of the first coil 21 may be 3 layers, and the number of layers of the second coil 22 may be 2 layers (as shown in FIG. Figure 7 The embodiment of the present invention does not limit this.

[0046] The embodiment of the present invention is directed to a motor body 1 having a non-uniform stacking thickness structure, and different layers of coils 2 are wound at positions of different transverse widths, which can fully utilize the limited installation space of the traction linear motor and maximize the motor traction capacity.

[0047] Alternatively, see Figure 6 As shown, in the case where the first coil 21 is a stacked coil, the number of layers of the first coil 21 is smaller than the number of layers of the second coil 22 .

[0048] Among them, when the coil 2 is wound in an overlapping manner in the middle of the motor body 1, that is, when the first coil 21 is a overlapping coil, correspondingly, the coil 2 is wound in a concentric manner at both ends of the motor body 1, that is, the second coil 22 is a concentric coil; in the traction linear motor of this structure, the number of layers of the first coil 21 is less than the number of layers of the second coil 22. Optionally, the number of layers of the first coil 21 is 2 layers, and the number of layers of the second coil 22 is 3 layers; that is Figure 7 Two layers of stacked coils are wound around the middle of the motor body 1 , and three layers of concentric coils are wound around the two ends of the motor body 1 .

[0049] The embodiment of the present invention adopts such a structure, so that the coil 2 can be wound in a lap-winding manner at the longitudinally longer portion of the traction linear motor, that is, the middle portion thereof, thereby reducing the overall weight of the traction linear motor and improving the traction force.

[0050] Alternatively, as Figure 7 As shown, when the first coil 21 is a concentric coil, the number of layers of the first coil 2 is greater than the number of layers of the second coil 22.

[0051] Among them, when the coil 2 is wound concentrically in the middle of the motor body 1, that is, when the first coil 21 is a concentric coil, correspondingly, the coil 2 is wound in an overlapping manner at both ends of the motor body 1, that is, the second coil 22 is an overlapping coil; in the traction linear motor of the above structure, the number of layers of the first coil 21 is greater than the number of layers of the second coil 22. Optionally, the number of layers of the first coil 21 is 3 layers, and the number of layers of the second coil 22 is 2 layers; that is Figure 6 The middle part of the motor body 1 is wound with three layers of concentric coils, and the two ends of the motor body 1 are wound with two layers of stacked coils.

[0052] Typically, since the coil 2 is wound around the teeth of the motor body 1, portions of the coil 2 extend from both sides of the motor body 1. Figure 5 As shown, the extended width can be the width of the coil 2 protruding from the lateral edge of the motor body 1 after being wound, or the extended width can also be equal to the thickness of the coil 2; wherein, the stacked coil has a larger width protruding from the lateral sides of the motor body 1 than the concentric coil. However, in actual applications, the smaller the width of the coil 2 protruding from the lateral sides of the motor body 1 (such as the thinner the coil 2), the larger the lateral width of the motor body 1 itself, and the smaller the lateral end effect of the traction linear motor. Therefore, when the embodiment of the present invention adopts a traction linear motor with the above structure (such as the first coil 21 is a 3-layer concentric coil, and the second coil 22 is a 2-layer stacked coil), the width of the motor body 1 extending to the lateral sides at the middle position can be reduced, thereby maximizing its traction force.

[0053] It should be noted that, for the convenience of description, the embodiments of the present invention are Figure 6 and Figure 7 As a result, the motor body 1 is simplified, and only a part of the teeth and the winding method of a part of the coil 2 are schematically shown.

[0054] Optionally, the longitudinal widths of both ends of the motor body 1 are the same, and the sum of the longitudinal widths of both ends of the motor body 1 is smaller than the longitudinal width of the middle portion of the motor body 1 .

[0055] The dimensions of the motor body 1 at both ends can be the same. For example, if the lateral widths of the motor body 1 at both ends are consistent, their longitudinal widths are also consistent. This design makes it easier to insert the motor into the bogie's support arm. Furthermore, the longitudinal width of the middle portion of the motor body 1 is larger and can be greater than the sum of the longitudinal widths of the two ends. That is, the overall dimensions of the wider lateral portion (the middle portion) of the motor body 1 account for the vast majority of the overall dimensions of the traction linear motor. This structural arrangement can significantly reduce the lateral end effect of the longer longitudinal portion (the middle portion) of the motor body 1 when concentric coils are wound in the middle portion of the motor body 1. Furthermore, when overlapping coils are wound in the middle portion of the motor body 1, the overall weight of the traction linear motor can be significantly reduced.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A traction linear motor, characterized in that: include: Motor body (1) and coil (2); A plurality of grooves (3) are arranged longitudinally on one side of the motor body (1), and each groove (3) is capable of passing through the motor body (1) transversely; The transverse widths of both ends of the motor body (1) are smaller than the transverse width of the middle portion of the motor body (1); the two ends of the motor body (1) are the two ends in the longitudinal direction of the motor body (1), and the middle portion of the motor body (1) is the portion between the two ends of the motor body (1); The coil (2) passes through the groove (3) and is wound on the motor body (1); the coil (2) comprises a first coil (21) and a second coil (22); the first coil (21) is wound in the groove (3) corresponding to the middle portion of the motor body (1); the second coil (22) is wound in the grooves (3) corresponding to the two ends of the motor body (1); the first coil (21) and the second coil (22) are wound in different ways; The first coil (21) includes a stacked coil, and the second coil (22) includes a concentric coil; or the first coil (21) includes a concentric coil, and the second coil (22) includes a stacked coil.

2. The traction linear motor according to claim 1, characterized in that: The number of layers of the first coil (21) and the second coil (22) are both at least two, and the number of layers of the first coil (21) is different from the number of layers of the second coil (22).

3. The traction linear motor according to claim 2, characterized in that: When the first coil (21) is a stacked coil, the number of layers of the first coil (21) is smaller than the number of layers of the second coil (22).

4. The traction linear motor according to claim 3, characterized in that: The first coil (21) has two layers, and the second coil (22) has three layers.

5. The traction linear motor according to claim 2, characterized in that: In the case where the first coil (21) is a concentric coil, the number of layers of the first coil (21) is greater than the number of layers of the second coil (22).

6. The traction linear motor according to claim 5, characterized in that: The number of layers of the first coil (21) is 3, and the number of layers of the second coil (22) is 2.

7. The traction linear motor according to claim 1, characterized in that: The material of the coil (2) includes copper and / or aluminum.

8. The traction linear motor according to claim 1, characterized in that: The longitudinal widths of both ends of the motor body (1) are the same, and the sum of the longitudinal widths of both ends of the motor body (1) is smaller than the longitudinal width of the middle portion of the motor body (1).

9. The traction linear motor according to claim 1, characterized in that: The depth of each groove (3) is the same.

10. The traction linear motor according to claim 1, characterized in that: The transverse widths of both ends of the motor body (1) are the same.

11. The traction linear motor according to claim 1, characterized in that: The motor body (1) is made of iron silicon steel sheet.

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