Long stator structure of linear motor

Abstract

The utility model relates to the technical field of motor structures, in particular to a long stator structure of a linear motor, which comprises two identical stator module units, and each stator module unit comprises a stator core, a winding unit and a plurality of combination keys. The stator iron core is of a cuboid structure, a wire embedding groove unit is formed in the front side of the stator iron core, the winding unit comprises a plurality of stator coils, all the stator coils are evenly distributed in the wire embedding groove unit side by side in a snakelike mode, and the ends of the stator coils are integrally sealed in a plastic mode. All the combination keys are fixed on the rear side of the stator iron core at intervals along the length direction of the stator iron core; the stator module units take the surfaces on which the stator coils are arranged as working surfaces, and the working surfaces of the two stator module units are opposite to each other. According to the technical scheme, modular design is adopted, the structure is simple, and compared with the prior art, the air resistance is small and ultra-high-speed operation can be achieved when the air conditioner runs in a low-vacuum environment.

Description

Technical Field

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

[0002] A linear motor is a transmission device that converts electrical energy directly into linear motion without the need for any intermediate conversion mechanism. In addition to its high thrust and high speed, it also has the characteristics of low speed and precision. It is widely used in industry, civil military and other linear motion occasions.

[0003] With the continuous expansion of the application scope of linear motors, especially the gradual maturity of the application of linear motors abroad, conditions have been created for the research of linear motors. At present, there is a strong demand for linear motors. Listing the theory and application of linear motors as a key research direction is of great significance to greatly promote the development of medium and low-speed linear motor technology. In January 2021, the world's first high-temperature superconducting high-speed maglev engineering prototype and test line was officially put into use. The coreless permanent magnet linear synchronous motor is used as the key device of the drive system. The theoretical design speed can reach 620km / h. However, the high-temperature superconducting high-altitude maglev engineering prototype and test line are still in the early stages of engineering application. That is, in maglev research, in order to achieve high-speed operation of linear motors and provide large thrust, there are mainly the following two structures:

[0004] The first is a superconducting linear motor. Using superconducting blocks or strips to replace the permanent magnets or coil magnets of traditional permanent magnet motors can still maintain a high power factor under a large air gap, and the air gap magnetic density is 2 to 3 times higher than that of traditional linear motors of the same size, which can achieve the propulsion capability of ultra-large loads, provide large thrust for maglev trains, and run at high speed. At present, the maximum speed of maglev trains using superconducting permanent magnets is about 600km / h, and it is a test line. A lot of research and development optimization work is still needed before it can be officially put into commercial application. The cooling cost is high when using low-temperature superconductivity (cooling medium temperature <-269℃), and the preparation and application technology of superconducting materials are relatively complex and energy consumption is higher when using high-temperature superconductivity.

[0005] The second type is a π-type linear motor, which can be regarded as two identical linear motors with a shared magnetic circuit. The thrust provided is twice that of a single motor of the same size. The specific structure is as follows: Figure 7 Although this structure can provide large thrust, the design of the mover structure is relatively complex.

[0006] At present, there are no engineering application cases for linear motor structures with speeds of thousands of kilometers per hour in low-vacuum environments, and there are no systematic technical routes and design criteria for the solutions and structural designs of ultra-high-speed linear motors. Summary of the invention

[0007] The purpose of the utility model is to propose a linear motor long stator structure in view of the deficiencies of the above-mentioned prior art, specifically, a linear motor long stator structure with ultra-high speed and large thrust under low vacuum. The linear motor described in this technical solution is a double-sided long primary and short secondary structure, which is a permanent magnet synchronous motor with a maximum operating speed of 1500km / h. The double-sided long stator adopts a modular design and is installed face-to-face in the middle of the long stator bracket structure. The stator winding is a single-layer wave winding structure. The winding input current generates a traveling wave magnetic field in the longitudinal direction. In the acceleration section, the mover and the model car are accelerated to the test speed. After running at a constant speed for a certain distance, it enters the braking section and relies on the induced braking current in the long stator module to achieve a smooth stop of the mover. In order to facilitate on-site installation and later replacement, the double-sided long stator adopts a face-to-face installation method and is fixed to the middle of the bracket structure by a combination key and a tightening bolt.

[0008] This is achieved specifically through the following technical solutions:

[0009] A linear motor long stator structure includes two identical stator module units, and the stator module unit includes a stator core, a winding unit and a plurality of combination keys; the stator core is a rectangular parallelepiped structure, a wire embedding slot unit is provided at the front side of the stator core, the winding unit includes a plurality of stator coils, all the stator coils are arranged in parallel in a serpentine shape and uniformly in the wire embedding slot unit, and the ends of the stator coils are integrally plastic-sealed; all the combination keys are fixed at intervals on the rear side of the stator core along the length direction of the stator core. The stator module unit uses the surface where the stator coils are arranged as the working surface, and the working surfaces of the two stator module units are opposite to each other.

[0010] Preferably, the stator core includes a plurality of tightly stacked stator punchings, a plurality of insulating bolt assemblies, an upper pressure plate and a lower pressure plate, and all the stator punchings are located between the upper pressure plate and the lower pressure plate; all the insulating bolt assemblies are arranged at intervals along the length direction of the stator core, and each insulating bolt assembly vertically passes through the upper pressure plate, all the stator punchings and the lower pressure plate in sequence, and then fixes the upper pressure plate, all the stator punchings and the lower pressure plate.

[0011] Preferably, a stator adhesive sheet is provided between the upper pressing plate and the uppermost stator punching sheet, and between the lower pressing plate and the lowermost stator punching sheet.

[0012] Preferably, a row of avoidance notches are provided at the front edges of the upper pressing plate and the lower pressing plate corresponding to the wire embedding groove units.

[0013] Preferably, the front edge thickness of the upper pressing plate and the lower pressing plate is smaller than the overall thickness of the upper pressing plate and the lower pressing plate themselves.

[0014] Preferably, the insulating bolt assembly comprises a stud, both ends of which are provided with a flat washer, an insulating washer and a nut, and the stud is sleeved with an insulating sleeve.

[0015] Preferably, the winding unit includes twelve-phase stator coils, with a phase difference of 15° between two adjacent phases, and is divided into four groups of three phases.

[0016] Preferably, the combination key includes a main key and a plurality of connecting bolts, a core connecting structure is arranged on the front side of the main key, a pair of oblique keys are welded on the rear side of the main key, and a grounding hole is arranged on the bottom of the combination key; the connecting bolts are vertically and detachably connected to the main key.

[0017] Preferably, the core connection structure is a dove-tail-shaped protrusion, and the rear side of the stator core is provided with dove-tail grooves for cooperating with the dove-tail-shaped protrusion at intervals along the length direction.

[0018] Preferably, the stator punching sheets are made of non-oriented cold-rolled silicon steel sheets.

[0019] Beneficial technical effects brought by the utility model:

[0020] 1) The long stator structure of a linear motor proposed in this technical solution adopts a modular design, has a simple structure, and is easy to disassemble and assemble. In actual use, a double-sided long stator (i.e., two stator module units of this technical solution) and an intermediate permanent magnet mover structure are used to provide large thrust. Compared with the existing superconducting or π-type structure, this technical solution operates in a low vacuum environment, has less wind resistance, and can achieve ultra-high-speed operation.

[0021] 2) The long stator structure of a linear motor proposed in this technical solution is relatively simple to manufacture, apply and maintain. Compared with superconducting linear motors, this technical solution does not require superconducting materials and cooling maintenance systems.

[0022] 3) The long stator structure of the linear motor proposed in this technical solution is suitable for low vacuum environment and can operate reliably in low vacuum environment without winding breakdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the axial view of the long stator structure of the linear motor;

[0024] Figure 2 This is an axial view of the long stator structure of the linear motor;

[0025] Figure 3 It is a schematic diagram of the working surface structure of the stator module unit;

[0026] Figure 4 Schematic diagram of the front structure of the stator core;

[0027] Figure 5It is a schematic diagram of the local structure of the stator punching sheet;

[0028] Figure 6 It is a schematic diagram of the partial front cross-sectional structure of the combination key;

[0029] Figure 7 Schematic diagram of the π-type structure.

[0030] In the figure:

[0031] 1. Stator core; 1.1. Stator punching sheet; 1.11. Wire embedding notch; 1.2. Insulating bolt assembly; 1.21. Double-headed stud; 1.22. Flat washer; 1.23. Insulating washer; 1.24. Nut; 1.25. Insulating sleeve; 1.3. Upper pressure plate; 1.4. Lower pressure plate; 1.5. Avoidance notch; 1.6. Stator adhesive sheet; 1.7. Wire embedding slot unit; 1.71. Wire embedding slot body; 1.8. Dove tail slot; 2. Winding unit; 2.1. Stator coil; 3. Combination key; 3.1. Main key; 3.2. Connecting bolt; 3.3. Grounding hole; 3.4. Dove tail protrusion; 3.5. Oblique key; 4. Bracket structure; 5. Perforation; 6. Motor conductive plate. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments.

[0033] Therefore, the following detailed description of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0036] The stator core 1 is a rectangular parallelepiped structure, that is, the stator core 1 is in the shape of a long strip, and the specific length, cross-sectional dimensions and material selection can be determined according to actual needs. It should be noted that the stator core 1 provides the magnetic flux path required for the motor to operate, and bears the longitudinal force, normal force and vertical force when the motor is running, and must have sufficient rigidity and strength.

[0037] A wire embedding slot unit 1.7 is provided at the front side of the stator core 1. The wire embedding slot unit 1.7 comprises a plurality of wire embedding slot bodies 1.71 arranged along the length direction of the stator core and perpendicular to the length direction of the stator core.

[0038] The winding unit 2 includes a plurality of stator coils 2.1. Based on the principle of "one slot, one line", all stator coils 2.1 are arranged in parallel in a serpentine shape and are evenly arranged in the wire-embedded slot unit 1.7. The ends of the stator coils 2.1 are integrally sealed with plastic. The ends of the stator coils 2.1 refer to the parts outside the wire-embedded slot body 1.71. The so-called serpentine shape is a periodic curve like a sine curve / cosine curve. The specific structure is as follows: Figure 3 In summary, the winding unit 2 of the present technical solution adopts a single-layer, full-pitch and wave-winding layout structure.

[0039] All the combination keys 3 are fixed at intervals on the rear side of the stator core 1 along the length direction of the stator core 1. In this way, when the long stator structure described in the technical solution is installed and used, the long stator structure can be stably installed on the support structure 4 through the combination keys 3.

[0040] like Figure 1 As shown, the stator module unit uses the surface on which the stator coils 2.1 are arranged as the working surface, and the working surfaces of the two stator module units are opposite to each other (ie face to face).

[0041] Example 2

[0042] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0043] The stator core 1 is a rectangular parallelepiped structure, including a number of tightly stacked stator punching sheets 1.1, a number of insulating bolt assemblies 1.2, an upper pressure plate 1.3 and a lower pressure plate 1.4. All stator punching sheets 1.1 are between the upper pressure plate 1.3 and the lower pressure plate 1.4, and the upper pressure plate 1.3 and the lower pressure plate 1.4 are made of ordinary carbon steel Q235. To ensure that the core is reliably pressed, all insulating bolt assemblies 1.2 are arranged at intervals along the length direction of the stator core 1, and each insulating bolt assembly 1.2 vertically passes through the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4 in sequence, and then fixes the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4. According to the structure, it can be seen that the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4 are provided with through holes 5 for the insulating bolt assemblies 1.2 to pass through.

[0044] The front side of the stator core 1 is provided with a wire embedding slot unit 1.7, that is, Figure 3As shown, the front edge of all stator punching sheets 1.1 is provided with a row of wire-embedded notches 1.11. In actual situations, each stator punching sheet 1.1 of the stator core 1 is provided with nearly a hundred wire-embedded notches 1.11. Therefore, it is difficult to solve the precision problem with the traditional double punching die. Only the method of segmented punching and accurate positioning can ensure the dimensional precision of the wire-embedded notches 1.11.

[0045] In order to ensure that the center lines of the height direction and the normal center lines of the numerous stator module units laid along the track are basically consistent, when stacking all the stator punching sheets 1.1, slot sample bars and L-shaped tooling can be used as an aid to ensure that the height tolerance of the stator core 1 after pressing is ≤0.5mm, and the end surface flatness tolerance of the stator core 1 is ≤0.2mm. When all the stator punching sheets 1.1 are in a stacked state, multiple wire embedding notches 1.11 are spliced ​​into a wire embedding slot body 1.71, and the wire embedding slot unit 1.7 contains several wire embedding slot bodies 1.71, that is, the number of wire embedding slots is equal to the number of wire embedding notches 1.11 on a single stator punching sheet 1.1.

[0046] The winding unit 2 comprises a plurality of stator coils 2.1, all of which are arranged in parallel in a serpentine shape and uniformly in the wire embedding slot unit 1.7, and the ends of the stator coils 2.1 are integrally sealed with plastic; all the combination keys 3 are fixed at intervals on the rear side of the stator core 1 along the length direction of the stator core 1.

[0047] The surface of the stator module unit on which the stator coils 2.1 are arranged is the working surface, and the working surfaces of the two stator module units are opposite to each other.

[0048] Example 3

[0049] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0050] Among them, the stator core 1 is a rectangular structure, including a number of tightly stacked stator punching sheets 1.1, a number of insulating bolt assemblies 1.2, an upper pressure plate 1.3 and a lower pressure plate 1.4, all stator punching sheets 1.1 are between the upper pressure plate 1.3 and the lower pressure plate 1.4; all insulating bolt assemblies 1.2 are arranged at intervals along the length direction of the stator core 1, and each insulating bolt assembly 1.2 vertically passes through the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4 in sequence, and then fixes the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4.

[0051] Considering that the installation of the long stator of the linear motor is limited by the space size in the vacuum pipe, the allowable space of the long stator of the linear motor is compressed to the limit, and the thickness of the upper pressure plate 1.3 and the lower pressure plate 1.4 is limited, which may not be enough to completely compress the stacked stator punching sheets 1.1. Based on this, it is preferred to use a stator adhesive sheet 1.6 to increase the rigidity of the upper and lower ends of the stator core 1 to ensure that the stator core 1 is reliably compressed. Specifically: a stator adhesive sheet 1.6 is provided between the upper pressure plate 1.3 and the uppermost stator punching sheet 1.1, and between the lower pressure plate 1.4 and the lowermost stator punching sheet 1.1.

[0052] In actual production, the surfaces of several double-sided painted silicon steel sheets are evenly coated with F-class epoxy silicon steel sheet adhesive, and then all the aforementioned silicon steel sheets are stacked, shaped, pressed, and baked to solidify into one, thereby obtaining the stator adhesive sheet 1.6 described in the present technical solution. It should be noted that the surface of the silicon steel sheet must be clean, free of impurities, and free of paint nodules before and after gluing, before and after lamination. Furthermore, after baking and curing, the surface of the stator adhesive sheet 1.6 can be sprayed with epoxy paint to prevent rust. In the present technical solution, the stator module unit is relatively long, and 20 to 30 silicon steel sheets can be used to bond into a stator adhesive sheet 1.6.

[0053] A wire embedding slot unit 1.7 is provided at the front side of the stator core 1, that is, a row of wire embedding notches 1.11 are provided at the front edges of all stator punching sheets 1.1. When all stator punching sheets 1.1 are in a stacked state, a plurality of wire embedding notches 1.11 are spliced ​​into a wire embedding slot body 1.71, and the wire embedding slot unit 1.7 includes a plurality of wire embedding slot bodies 1.71.

[0054] The winding unit 2 comprises a plurality of stator coils 2.1, all of which are arranged in parallel in a serpentine shape and uniformly in the wire embedding slot unit 1.7, and the ends of the stator coils 2.1 are integrally sealed with plastic; all the combination keys 3 are fixed at intervals on the rear side of the stator core 1 along the length direction of the stator core 1.

[0055] The surface of the stator module unit on which the stator coils 2.1 are arranged is the working surface, and the working surfaces of the two stator module units are opposite to each other.

[0056] Example 4

[0057] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0058] Among them, the stator core 1 is a rectangular structure, including a number of tightly stacked stator punching sheets 1.1, a number of insulating bolt assemblies 1.2, an upper pressure plate 1.3 and a lower pressure plate 1.4, all stator punching sheets 1.1 are between the upper pressure plate 1.3 and the lower pressure plate 1.4; all insulating bolt assemblies 1.2 are arranged at intervals along the length direction of the stator core 1, and each insulating bolt assembly 1.2 vertically passes through the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4 in sequence, and then fixes the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4.

[0059] A wire embedding slot unit 1.7 is provided at the front side of the stator core 1, that is, a row of wire embedding notches 1.11 are provided at the front edges of all stator punching sheets 1.1. When all stator punching sheets 1.1 are in a stacked state, a plurality of wire embedding notches 1.11 are spliced ​​into a wire embedding slot body 1.71, and the wire embedding slot unit 1.7 includes a plurality of wire embedding slot bodies 1.71.

[0060] Furthermore, considering that the clamping force of the insulating bolt assembly 1.2 on the stator core can be well transmitted to the tooth portion of the stator core 1 (i.e., the position where the wire embedding groove unit 1.7 is opened), the technical solution extends the leading edges of the upper pressure plate 1.3 and the lower pressure plate 1.4 to the position of the wire embedding groove unit 1.7. According to this structure, the leading edges of the upper pressure plate 1.3 and the lower pressure plate 1.4 are provided with a row of avoidance notches 1.5 corresponding to the wire embedding groove unit 1.7, and the avoidance notches 1.5 are processed by laser cutting.

[0061] Furthermore, the winding unit 2 includes a plurality of stator coils 2.1, all of which are arranged in parallel in a serpentine shape and are uniformly arranged in the wire embedding slot unit 1.7, and the ends of the stator coils 2.1 are integrally sealed with plastic; all combination keys 3 are fixed at intervals on the rear side of the stator core 1 along the length direction of the stator core 1.

[0062] Furthermore, taking into account the discharge distance of the stator coil 2.1 and the stiffness of the pressure plate, the thickness of the pressure plate close to the stator coil 2.1 is thin, and the thickness of the pressure plate away from the stator coil 2.1 is thick, which is specifically expressed as: the leading edge thickness of the upper pressure plate 1.3 and the lower pressure plate 1.4 is smaller than the overall thickness of the upper pressure plate 1.3 and the lower pressure plate 1.4 themselves.

[0063] The surface of the stator module unit on which the stator coils 2.1 are arranged is the working surface, and the working surfaces of the two stator module units are opposite to each other.

[0064] Example 5

[0065] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0066] Among them, the stator core 1 is a rectangular structure, including a number of tightly stacked stator punching sheets 1.1, a number of insulating bolt assemblies 1.2, an upper pressure plate 1.3 and a lower pressure plate 1.4, all stator punching sheets 1.1 are between the upper pressure plate 1.3 and the lower pressure plate 1.4; all insulating bolt assemblies 1.2 are arranged at intervals along the length direction of the stator core 1, and each insulating bolt assembly 1.2 vertically passes through the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4 in sequence, and then fixes the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4.

[0067] Furthermore, the insulating bolt assembly 1.2 includes a stud 1.21, and both ends of the stud 1.21 are provided with a flat washer 1.22, an insulating washer 1.23 and a nut 1.24, and the stud 1.21 is provided with an insulating sleeve 1.25. More specifically: the stud 1.21 is formed by straightening 35# cold-drawn round steel and then integrally processed, the insulating sleeve 1.25 is made of epoxy phenolic glass cloth tube, and the insulating washer 1.23 is a high-strength laminated glass cloth board. The insulating washer 1.23 and the insulating sleeve 1.25 are used to block the current flow path between the stud 1.21 and other components to prevent the stud 1.21 from burning and melting due to the flow of induced current during the operation of the linear motor, thereby affecting safe operation. The insulating bolt assembly 1.2 bears the stator module unit compression requirement to avoid large vibrations caused by the stator core 1 not being compressed during operation, and large deformation during the installation and transportation of the long stator. When the stator core 1 is installed and pressed, the interval between the pieces is 16kg / cm by a hydraulic press or a special pressing tool. 2 The stator core 1 is compressed with a pressure of , lubricant is sprayed on the thread surface of the stud 1.21 and the surface of the nut 1.24, and the nuts 1.24 are tightened in sequence according to a torque value of 100N.m when the stator core 1 is under pressure. After the pressure is released, the nuts 1.24 are spot welded to the stud 1.21, and at least one pair of sides of each nut 1.24 is spot welded.

[0068] A wire embedding slot unit 1.7 is provided at the front side of the stator core 1, that is, a row of wire embedding notches 1.11 are provided at the front edges of all stator punching sheets 1.1. When all stator punching sheets 1.1 are in a stacked state, a plurality of wire embedding notches 1.11 are spliced ​​into a wire embedding slot body 1.71, and the wire embedding slot unit 1.7 includes a plurality of wire embedding slot bodies 1.71.

[0069] The winding unit 2 comprises a plurality of stator coils 2.1, all of which are arranged in parallel in a serpentine shape and uniformly in the wire embedding slot unit 1.7, and the ends of the stator coils 2.1 are integrally sealed with plastic; all the combination keys 3 are fixed at intervals on the rear side of the stator core 1 along the length direction of the stator core 1.

[0070] The surface of the stator module unit on which the stator coils 2.1 are arranged is the working surface, and the working surfaces of the two stator module units are opposite to each other.

[0071] Example 6

[0072] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0073] The stator core 1 is a rectangular parallelepiped structure, that is, the stator core 1 is in the shape of a long strip, and the specific length and cross-sectional dimensions can be determined according to actual needs. A wire embedding slot unit 1.7 is provided at the front side of the stator core 1, and the wire embedding slot unit 1.7 includes a plurality of wire embedding slot bodies 1.71 arranged along the length direction of the stator core and perpendicular to the length direction of the stator core.

[0074] The winding unit 2 includes a plurality of stator coils 2.1. Based on the principle of "one line per slot", all stator coils 2.1 are arranged in parallel in a serpentine shape and are evenly arranged in the wire-embedded slot unit 1.7. The so-called serpentine shape is a periodic curve like a sine curve or a cosine curve. The specific structure is as follows: Figure 3 In summary, the winding unit 2 of the present technical solution adopts a single-layer, full-pitch and wave-winding layout structure.

[0075] All the combination keys 3 are fixed at intervals on the rear side of the stator core 1 along the length direction of the stator core 1. In this way, when the long stator structure described in the technical solution is installed and used, the long stator structure can be stably installed on the support structure 4 through the combination keys 3.

[0076] like Figure 1 As shown, the stator module unit uses the surface on which the stator coils 2.1 are arranged as the working surface, and the working surfaces of the two stator module units are opposite to each other (ie face to face).

[0077] In order to realize the connection and fixation between the stator module unit and the support structure 4, multiple sets of combination keys 3 are set on the back of each stator module unit. The material of the combination key 3 is forged steel 35. The combination key 3 includes a main key 3.1 and a plurality of connecting bolts 3.2. The front side of the main key 3.1 is provided with an iron core connection structure, and a pair of oblique keys 3.5 are welded on the rear side of the main key 3.1. Further, the iron core connection structure is a dove-tail protrusion 3.4, and the rear side of the stator core 1 is provided with dove-tail grooves 1.8 for cooperating with the dove-tail protrusion 3.4 at intervals along the length direction. Based on this structure, after the dove-tail protrusion is embedded in the dove-tail groove 1.8, the main key 3.1 is welded and fixed on the rear side of the stator core 1. The design of the oblique key 3.5 is to facilitate the on-site longitudinal fine-tuning of the position of the stator module unit. During on-site installation, after the position of the stator module unit is adjusted, the end with a larger cross section of the oblique key 3.5 is knocked at the same time. After it is in place, the oblique key 3.5 is welded with the main key 3.1. Considering the reliable grounding of the stator module unit, a grounding hole 3.3 is provided at the bottom of the combination key 3, and it is directly grounded through a grounding cable. The connecting bolt 3.2 is vertically and detachably connected to the main key 3.1, such as Figure 2 As shown, when the stator module unit is installed, the connecting bolt 3.2 is removed from the main key 3.1, passed through the support structure 4, and then reconnected to the main key 3.1.

[0078] Example 7

[0079] This embodiment discloses a linear motor long stator structure as a preferred implementation scheme of the utility model. Figure 1 As shown, two identical stator module units are included, and the stator module unit includes a stator core 1, a winding unit 2 and a plurality of combination keys 3.

[0080] The stator core 1 is a rectangular parallelepiped structure, and the stator core 1 includes a plurality of tightly stacked stator punching sheets 1.1, a plurality of insulating bolt assemblies 1.2, an upper pressure plate 1.3 and a lower pressure plate 1.4, and all stator punching sheets 1.1 are located between the upper pressure plate 1.3 and the lower pressure plate 1.4; all insulating bolt assemblies 1.2 are arranged at intervals along the length direction of the stator core 1, and each insulating bolt assembly 1.2 vertically passes through the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4 in sequence, and then fixes the upper pressure plate 1.3, all stator punching sheets 1.1 and the lower pressure plate 1.4.

[0081] Furthermore, stator adhesive sheets 1.6 are provided between the upper pressing plate 1.3 and the uppermost stator punching sheet 1.1, and between the lower pressing plate 1.4 and the lowermost stator punching sheet 1.1.

[0082] Furthermore, the stator punching sheet 1.1 is the main magnetic flux path of the linear motor. In view of the ultra-high frequency operation requirements in this technical solution, non-oriented cold-rolled silicon steel sheets with good high-frequency characteristics and low losses are selected to make the stator punching sheet 1.1.

[0083] Furthermore, a row of avoidance notches 1.5 are provided at the front edges of the upper pressing plate 1.3 and the lower pressing plate 1.4 corresponding to the wire embedding groove units 1.7.

[0084] Furthermore, the thickness of the front edges of the upper pressing plate 1.3 and the lower pressing plate 1.4 is smaller than the overall thickness of the upper pressing plate 1.3 and the lower pressing plate 1.4 themselves.

[0085] Furthermore, the insulating bolt assembly 1.2 comprises a stud 1.21, both ends of which are provided with a flat washer 1.22, an insulating washer 1.23 and a nut 1.24, and an insulating sleeve 1.25 is sleeved on the stud 1.21.

[0086] The front side of the stator core 1 is provided with a wire-embedded slot unit 1.7, which includes a plurality of wire-embedded slot bodies 1.71 arranged along the length direction of the stator core and perpendicular to the length direction of the stator core. The winding unit 2 includes a plurality of stator coils 2.1, and all stator coils 2.1 are arranged in parallel in a serpentine shape and uniformly arranged in the wire-embedded slot unit 1.7. More specifically, in the present technical solution, the linear motor is a twelve-phase motor, based on which the winding unit 2 includes a twelve-phase stator coil 2.1, with a phase difference of 15° between adjacent phases, divided into four groups of three phases, and arranged in the wire-embedded slot unit 1.7 in a single-layer, full-pitch, wave-wound form.

[0087] Considering the limitation of vacuum pipe space, the total height of the stator coil 2.1 must meet the specified requirements. After the stator coil 2.1 comes out of the wire embedding slot 1.71, the end has a large inclination angle. Taking into account the accuracy of the bending size of the stator coil 2.1 and the density of the end insulation wrapping, the winding material is copper plate, and there is one conductor in each wire embedding slot 1.71. The same-phase windings in the same stator module unit are twisted at the nose end and brazed into one. Since each wire embedding slot 1.71 has only one conductor, the two conductors in the same phase and each span need to be staggered in the normal direction to avoid interference between the sides of the stator coil 2.1 and the inability to embed the wire.

[0088] After the wire embedding is completed, the stator module unit is solidified by post-VPI dipping and baking. Due to the end space requirements, the bevel gap between the ends of adjacent two-phase windings is small and cannot meet the low-vacuum winding discharge distance requirements. The stator coil 2.1 can be integrally filled with glue and plastic-sealed to ensure that the bevel gap is densely filled and the motor winding will not be broken down during low-vacuum operation.

[0089] All the combination keys 3 are fixed to the rear side of the stator core 1 at intervals along the length direction of the stator core 1. More specifically, the combination key 3 includes a main key 3.1 and a plurality of connecting bolts 3.2. A core connection structure is provided on the front side of the main key 3.1. A pair of oblique keys 3.5 are welded on the rear side of the main key 3.1. A grounding hole 3.3 is provided at the bottom of the combination key 3. The connecting bolts 3.2 are vertically and detachably connected to the main key 3.1. Furthermore, the core connection structure is a dove-tail protrusion 3.4. The rear side of the stator core 1 is provided with dove-tail grooves 1.8 for cooperating with the dove-tail protrusion 3.4 at intervals along the length direction.

[0090] The stator module unit uses the surface on which the stator coils 2.1 are arranged as the working surface, and the working surfaces of the two stator module units are opposite to each other.

Claims

1. A linear motor long stator structure, characterized in that: It comprises two identical stator module units, and the stator module units comprise a stator core (1), a winding unit (2) and a plurality of combination keys (3); The stator core (1) is of a rectangular parallelepiped structure, a wire embedding slot unit (1.7) is provided on the front side of the stator core (1), the winding unit (2) comprises a plurality of stator coils (2.1), all the stator coils (2.1) are arranged in parallel in a serpentine shape and are evenly arranged in the wire embedding slot unit (1.7), and the ends of the stator coils (2.1) are integrally plastic-sealed; all the combination keys (3) are fixed at intervals on the rear side of the stator core (1) along the length direction of the stator core (1); The stator module unit uses the surface on which the stator coil (2.1) is arranged as a working surface, and the working surfaces of the two stator module units are opposite to each other.

2. A linear motor long stator structure as claimed in claim 1, characterized in that: The stator core (1) comprises a plurality of tightly fitted and stacked stator punching sheets (1.1), a plurality of insulating bolt assemblies (1.2), an upper pressure plate (1.3) and a lower pressure plate (1.4), wherein all the stator punching sheets (1.1) are located between the upper pressure plate (1.3) and the lower pressure plate (1.4); all the insulating bolt assemblies (1.2) are arranged at intervals along the length direction of the stator core (1), and each insulating bolt assembly (1.2) vertically passes through the upper pressure plate (1.3), all the stator punching sheets (1.1) and the lower pressure plate (1.4) in sequence, thereby fixing the upper pressure plate (1.3), all the stator punching sheets (1.1) and the lower pressure plate (1.4).

3. A linear motor long stator structure as claimed in claim 2, characterized in that: A stator adhesive sheet (1.6) is provided between the upper pressing plate (1.3) and the uppermost stator punching sheet (1.1), and between the lower pressing plate (1.4) and the lowermost stator punching sheet (1.1).

4. A linear motor long stator structure as claimed in claim 2, characterized in that: The front edges of the upper pressing plate (1.3) and the lower pressing plate (1.4) are provided with a row of avoidance notches (1.5) corresponding to the wire embedding groove units (1.7).

5. A linear motor long stator structure as claimed in claim 4, characterized in that: The front edge thickness of the upper pressing plate (1.3) and the lower pressing plate (1.4) is smaller than the overall thickness of the upper pressing plate (1.3) and the lower pressing plate (1.4) themselves.

6. A linear motor long stator structure as claimed in claim 2, characterized in that: The insulating bolt assembly (1.2) comprises a stud (1.21), both ends of which are provided with a flat washer (1.22), an insulating washer (1.23) and a nut (1.24), and an insulating sleeve (1.25) is sleeved on the stud (1.21).

7. A linear motor long stator structure as claimed in claim 1, characterized in that: The winding unit (2) comprises twelve-phase stator coils (2.1), with a phase difference of 15° between two adjacent phases, and the winding unit (2) is divided into four groups of three phases.

8. A linear motor long stator structure as claimed in claim 1, characterized in that: The combination key (3) comprises a main key (3.1) and a plurality of connecting bolts (3.2); an iron core connecting structure is arranged on the front side of the main key (3.1); a pair of oblique keys (3.5) are welded on the rear side of the main key (3.1); and a grounding hole (3.3) is arranged at the bottom of the combination key (3); and the connecting bolts (3.2) are vertically and detachably connected to the main key (3.1).

9. A linear motor long stator structure as claimed in claim 8, characterized in that: The core connection structure is a dove-tail shaped protrusion (3.4), and dove-tail grooves (1.8) for cooperating with the dove-tail shaped protrusion (3.4) are arranged at intervals along the length direction on the rear side of the stator core (1).

10. A linear motor long stator structure as claimed in claim 2, characterized in that: The stator punching sheet (1.1) is made of non-oriented cold-rolled silicon steel sheet.

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