Motor stator structure of spliced iron core and processing method thereof

Abstract

The invention discloses a motor stator structure with spliced iron cores and a processing method thereof, the motor stator structure comprises a stator outer iron core, a stator inner iron core and a stator embedded iron core, and the stator embedded iron core is embedded into the stator outer iron core. The stator structure adopts a structural form of the stator outer iron core, the stator inner iron core and the stator embedded iron core, and the stator outer iron core, the stator inner iron core and the stator embedded iron core are respectively formed through a special processing method, so that the motor stator structure has the effects of low loss, high efficiency and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor stator structure with a spliced ​​iron core and a processing method thereof. Background Art

[0002] With the continuous improvement of new energy vehicle technology, electric drive systems are also constantly developing towards high power density, high efficiency and low cost. As an important component of the electric drive system, it is particularly important to improve motor efficiency and reduce motor production costs.

[0003] There are many kinds of losses in the operation of the motor, and the motor stator iron loss is one of the main losses. How to reduce the stator iron loss has become an effective method to improve the efficiency of the motor. The method of reducing the stator iron loss of the motor in the prior art is mainly to reduce the thickness of the silicon steel sheet, but the reduction in the thickness of the silicon steel sheet is limited, so the impact on the stator iron loss is also limited; on the other hand, the silicon steel sheets that make up the stator core in the prior art are generally made by stamping. This stamping method causes most of the material to be wasted, and the recycling price of the stamped waste is also very low, which also causes the problem of high overall production cost of the motor. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a motor stator structure with an efficient and low-cost spliced ​​iron core and a processing method thereof, which can effectively reduce the iron loss of the stator structure, while improving material utilization and reducing production costs.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A motor stator structure with a spliced ​​iron core comprises a stator outer iron core, a stator inner iron core and a stator embedded iron core, wherein the stator embedded iron core is embedded in the stator outer iron core.

[0006] Preferably, the stator outer core is provided with a plurality of mounting grooves or mounting holes evenly distributed along the circumferential direction, and the stator embedded core includes a plurality of embedded blocks, the embedded blocks correspond one-to-one to the mounting grooves or mounting holes, and the embedded blocks are embedded in the mounting grooves or mounting holes at corresponding positions.

[0007] Preferably, a plurality of first protrusion / depression structures are evenly distributed along the circumferential direction on the inner circumference of the stator outer core, and a plurality of second depression / protrusion structures are evenly distributed on the outer circumference of the stator inner core, and the first protrusion / depression structures cooperate with the second depression / protrusion structures.

[0008] Preferably, a plurality of stator slots are provided on the inner circumference of the stator inner core, and notches are provided on the outer circumference of the stator inner core at positions corresponding to the stator slots, and an axial oil passage is formed between the notches and the stator outer core at corresponding positions.

[0009] A method for processing a motor stator structure with a spliced ​​core as described above includes a method for preparing a stator outer core, a method for preparing a stator inner core, and a method for preparing a stator embedded core.

[0010] Preferably, the preparation method of the stator outer core is as follows: the stator outer core is formed by winding a strip core structure, and the stator outer core is made of non-oriented silicon steel sheets.

[0011] Preferably, the preparation method of the stator inner core is as follows: the stator inner core is formed by stacking a plurality of inner iron core sheets in sequence along the axial direction, and the inner iron core sheets are made of oriented silicon steel sheets.

[0012] Preferably, the inner iron core sheet is formed by a plurality of single-piece arc-shaped structures that are rotated and spliced ​​in sequence along the circumferential direction, and two adjacent single-piece arc-shaped structures are connected by self-adhesion or dispensing.

[0013] Preferably, the single-piece arc-shaped structure is formed by shaping or winding a single-piece structure, and the single-piece structure is processed by oriented silicon steel sheets.

[0014] Preferably, the embedded block is formed by stacking a plurality of single-piece special-shaped structures, two adjacent single-piece special-shaped structures are connected by self-adhesion or dispensing, and the single-piece special-shaped structure is made of a stator slot cut-out portion of the stator inner core.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention uses a stator structure formed by splicing a stator outer core, a stator inner core and a stator embedded core. At the same time, a mounting groove or a mounting hole is opened on the stator outer core, and the stator embedded core is axially inserted into the mounting groove or the mounting hole on the stator outer core, thereby effectively improving the magnetic conductivity of the yoke of the stator structure. Therefore, the stator structure can effectively reduce stator loss, improve motor efficiency, and is suitable for high-efficiency and low-cost motors.

[0016] 2. The stator outer core of the present invention is made of traditional non-oriented silicon steel sheets, and a strip core structure is obtained by strip stamping or other processing methods, and then the strip core structure is gradually wound into shape. This processing method can effectively save material waste caused by full-circle stamping, improve the utilization rate of motor materials, and reduce the production cost of the motor.

[0017] 3. The inner core of the stator of the present invention is made of oriented silicon steel sheets, and a single arc structure is formed by a single or multiple teeth. It is stacked and wound by self-adhesive or dispensing processes to form a complete inner core of the stator. This processing method can also improve the utilization rate of motor materials and reduce the production cost of the motor.

[0018] 4. A notch structure is provided on the outer circumference of the stator inner core of the present invention. The notch cooperates with other structures such as the stator outer core to form an axial oil channel, thereby improving the heat dissipation capacity of the stator structure during operation, thereby also reducing the loss of the stator structure.

[0019] 5. In the present invention, there is a first protrusion / recess structure at the junction of the stator outer core and the stator inner core, and there is a second recess / protrusion structure at the corresponding position of the stator inner core. The protrusion and recess structures cooperate with each other to effectively improve the stability of the stator structure and the magnetic conductivity.

[0020] 6. The embedded stator core of the present invention is made of oriented silicon steel sheets, and the stator slot portion cut off from the stator inner core is used for stacking design, which greatly improves material utilization and reduces motor production costs.

[0021] 7. The stator structure of the present invention adopts a structural form of a stator outer core, a stator inner core and a stator embedded core, and the stator outer core, the stator inner core and the stator embedded core are formed respectively by a special processing method, so that the motor stator structure of the present invention has the effects of low loss, high efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the motor stator structure of the spliced ​​iron core of the present invention (with installation grooves); Figure 2 It is a schematic structural diagram of the stator outer iron core in the motor stator structure of the spliced ​​iron core of the present invention; Figure 3 It is a structural schematic diagram of the motor stator structure of the spliced ​​core of the present invention (with mounting holes); Figure 4 It is a structural schematic diagram of a single-piece arc structure in the motor stator structure of the spliced ​​iron core of the present invention; Figure 5 It is a schematic diagram of the structure formed by the inner iron core sheets in the motor stator structure of the spliced ​​iron core of the present invention; Figure 6 It is a structural schematic diagram of the stator embedded core embedded in the stator outer core in the motor stator structure with spliced ​​cores of the present invention.

[0023] Explanation of the reference numerals: stator outer core 1 , strip core structure 101 , mounting groove 102 , first protruding structure 103 , stator inner core 2 , single-piece arc structure 201 , single-piece structure 202 , notch 203 , second recessed structure 204 , stator embedded core 3 , embedded block 301 . DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0025] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is 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 cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] As attached Figure 1 As shown, the present solution provides a motor stator structure with a spliced ​​core, including a stator outer core 1 , a stator inner core 2 and a stator embedded core 3 , wherein the stator embedded core 3 is embedded in the stator outer core 1 .

[0027] Specifically, as attached Figure 2 As shown, the preparation method of the stator outer core 1 of the present embodiment is as follows: the stator outer core 1 is made of non-oriented silicon steel sheets, and the stator outer core 1 is composed of a strip core structure 101 (as shown in the attached Figure 2 The strip core structure 101 can be obtained by strip stamping or other processing methods, and then gradually wound into shape by the strip core structure 101. This processing method can effectively save material waste caused by full-circle stamping, improve the utilization rate of motor materials, and reduce the production cost of the motor.

[0028] A plurality of mounting grooves 102 or mounting holes are evenly distributed along the circumferential direction on the stator outer core 1. Figure 2 The figure shows the case where the mounting groove 102 is provided. The stator embedded core 3 includes a plurality of embedded blocks 301. The embedded blocks 301 correspond to the mounting grooves 102 or mounting holes one by one, and the embedded blocks 301 are embedded in the mounting grooves 102 or mounting holes at the corresponding positions. Figure 1 FIG. 1 is a schematic diagram showing a structure in which a mounting groove 102 is provided on the stator outer core 1 and a stator embedded core 3 is embedded in the mounting groove 102. Figure 3 The figure shows a schematic diagram of a structure in which a mounting hole is provided on the stator outer core 1 and the stator embedded core 3 is embedded in the mounting hole. A plurality of first protrusion / recess structures are evenly distributed along the circumference on the inner circumference of the stator outer core 1. Figure 2 As shown, in this specific embodiment, a plurality of first protrusion structures 103 are provided on the inner circumference of the stator outer core 1 .

[0029] The method uses a stator structure formed by splicing a stator outer core 1, a stator inner core 2 and a stator embedded core 3, and at the same time, a mounting groove 102 or a mounting hole is opened on the stator outer core 1, and the stator embedded core 3 is axially inserted into the mounting groove 102 or the mounting hole on the stator outer core 1, thereby effectively improving the magnetic conductivity of the yoke of the stator structure. Therefore, the stator structure can effectively reduce stator loss, improve motor efficiency, and is suitable for high-efficiency and low-cost motors.

[0030] In this embodiment, the preparation method of the stator inner core 2 is as follows: the stator inner core 2 is formed by a plurality of inner iron core sheets stacked in sequence along the axial direction, and the inner iron core sheets are made of oriented silicon steel sheets. The inner iron core sheets are formed by a plurality of single-piece arc structures 201 rotated and spliced ​​in sequence along the circumferential direction, and two adjacent single-piece arc structures 201 are connected by self-adhesion or dispensing. The single-piece arc structure 201 is formed by a single-piece structure 202 by shaping or winding, and the single-piece structure 202 is made of oriented silicon steel sheets. For details, see the attached Figure 4 As shown, the monolithic structure 202 is made of oriented silicon steel sheets and can be made by stamping or other methods (such as the attached Figure 4 As shown in (a) in the figure, when the monolithic structure 202 is obtained, since the monolithic structure 202 is provided with stator slots, the material removed from the stator slots can be used as the material for the stator embedded core 3 (as shown in the attached figure). Figure 4 The monolithic structure 202 is specifically shown in the attached Figure 4 As shown in (c) in the figure, a notch 203 is provided on the monolithic structure 202. After the stator inner core 2 is formed, the notch 203 cooperates with other structures such as the stator outer core 1 to form an axial oil channel, thereby improving the heat dissipation capacity of the stator structure during operation, thereby reducing the loss of the stator structure. At this time, the monolithic structure 202 directly formed by stamping is a planar structure. In order to form the annular stator inner core 2, the monolithic structure 202 needs to be further shaped or wound to form a monolithic arc-shaped structure 201 with a certain arc shape, as shown in the attached figure. Figure 4 As shown in (d), in order to cooperate with the first protrusion / recess structure on the stator outer core 1, a corresponding second recess / protrusion structure is also arranged on the single arc structure 201. In this specific embodiment, since the first protrusion structure 103 is arranged on the stator outer core 1, the single arc structure 201 is provided with a second recess structure 204. The protrusion and recess structures cooperate with each other to effectively improve the stability and magnetic conductivity of the stator structure. The single arc structures 201 are then bonded or glued in pairs, thereby forming a single inner iron core, as shown in the attached figure. Figure 5 As shown, the single-piece inner iron core sheets are stacked to finally form the entire stator inner iron core 2.

[0031] In this embodiment, the preparation method of the stator embedded core 3 is as follows: the embedded block 301 is formed by stacking multiple single-piece special-shaped structures, and two adjacent single-piece special-shaped structures are connected by self-adhesion or dispensing to form a single embedded block 301, and the single-piece special-shaped structure is made of the stator slot cut-out part of the stator inner core 2, which is made of oriented silicon steel sheet. The prepared single embedded blocks 301 are then respectively embedded in the installation slots 102 of the stator outer core 1, thereby forming the entire stator embedded core 3, as shown in the attached figure. Figure 6The stator embedded core is made of oriented silicon steel sheets, and the stator slot part cut off from the stator inner core is used for stacking design, which greatly improves the material utilization rate and reduces the production cost of the motor.

[0032] The stator structure of the present invention adopts a structural form of a stator outer core 1, a stator inner core 2 and a stator embedded core 3, and the stator outer core 1, the stator inner core 2 and the stator embedded core 3 are formed respectively by a special processing method, so that the motor stator structure of the present invention has the effects of low loss, high efficiency and low cost.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A motor stator structure with a spliced ​​core, It is characterized in that The invention comprises a stator outer core, a stator inner core and a stator embedded core, wherein the stator embedded core is embedded in the stator outer core.

2. The motor stator structure of the spliced ​​core according to claim 1, It is characterized in that The stator outer core is uniformly provided with a plurality of mounting grooves or mounting holes along the circumferential direction, and the stator embedded core includes a plurality of embedded blocks, the embedded blocks correspond to the mounting grooves or mounting holes one by one, and the embedded blocks are embedded in the mounting grooves or mounting holes at corresponding positions.

3. The motor stator structure of the spliced ​​core according to claim 2, It is characterized in that A plurality of first protrusion / recess structures are evenly distributed along the circumferential direction on the inner circumference of the stator outer core, and a plurality of second recess / protrusion structures are evenly distributed on the outer circumference of the stator inner core, and the first protrusion / recess structures cooperate with the second recess / protrusion structures.

4. The motor stator structure of the spliced ​​core according to claim 1, It is characterized in that A plurality of stator slots are provided on the inner circumference of the stator inner core, and notches are provided on the outer circumference of the stator inner core at positions corresponding to the stator slots, forming axial oil passages between the notches and the stator outer core at corresponding positions.

5. A method for processing the motor stator structure of the spliced ​​core as claimed in claim 1, It is characterized in that The invention comprises a method for preparing a stator outer core, a method for preparing a stator inner core and a method for preparing a stator embedded core.

6. The method for processing the motor stator structure of the spliced ​​core according to claim 5, It is characterized in that The preparation method of the stator outer core is as follows: the stator outer core is formed by winding a strip core structure, and the stator outer core is made of non-oriented silicon steel sheets.

7. The method for processing the motor stator structure of the spliced ​​core according to claim 5, It is characterized in that The preparation method of the stator inner core is as follows: the stator inner core is formed by stacking a plurality of inner iron core sheets in sequence along the axial direction, and the inner iron core sheets are made of oriented silicon steel sheets.

8. The method for processing the motor stator structure of the spliced ​​core according to claim 7, It is characterized in that The inner iron core sheet is formed by a plurality of single arc-shaped structures which are rotated and spliced ​​in sequence along the circumferential direction, and two adjacent single arc-shaped structures are connected by self-adhesion or glue dispensing.

9. The method for processing the motor stator structure of the spliced ​​core according to claim 8, It is characterized in that The single-piece arc-shaped structure is formed by shaping or winding a single-piece structure, and the single-piece structure is processed from oriented silicon steel sheets.

10. The method for processing the motor stator structure of the spliced ​​core according to claim 5, It is characterized in that The embedding block is formed by stacking a plurality of single-piece special-shaped structures, two adjacent single-piece special-shaped structures are connected by self-adhesion or glue dispensing, and the single-piece special-shaped structure is made of the stator slot cut-out portion of the stator inner core.

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