Plug-in type stator core structure of disc type motor

Abstract

The utility model relates to a plug-in type stator core structure of a disc type motor, which comprises a stator tooth part and a stator yoke part, and the stator tooth part and the stator yoke part are connected in a splicing mode. Tooth boots extending towards the two sides are arranged at the top ends of the stator tooth parts, so that the stator winding is wound from bottom to top from the bottoms of the stator tooth parts. And the stator tooth part and the tooth boot are made of oriented silicon steel. When the stator is used, the flat wire can be directly wound from the lower end of the stator tooth part when forming a winding, so that the winding is more convenient, and the slot fullness rate is increased. The area of the tooth boot part can be increased, the problem of flat wire passing does not need to be considered any more, and the electromagnetic performance of the whole machine is improved. The stator tooth part is made of oriented silicon steel, and the stator yoke part is made of non-oriented silicon steel, so that the flux density defect caused by magnetic line turning is reduced and the output torque is increased by utilizing different characteristics of materials.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flux motors, in particular to a plug-in stator core structure of a disc motor, and in particular to a stator core structure with plug-in splicing at the core tooth portion. Background Art

[0002] In the prior art, the stator core of the axial flux disc motor is generally made as a whole, and the stator core usually includes a stator tooth shoe, a stator tooth part and a stator tooth yoke part. Due to the provision of the stator tooth shoe part, it will cause the problem of difficulty in winding the flat wire of the stator tooth part. The protruding part of the tooth shoe will block the winding and unwinding of the flat wire. It is difficult to directly wind the flat wire, and it is also impossible to directly make it into a coil winding to complete the wire embedding process, which reduces the feasibility of mass production. Therefore, some companies will use round wire for winding, but this process is difficult to meet the requirements of mass production efficiency, and reduces the slot full rate, thereby affecting the performance of the motor. Therefore, there is also a design form of canceling the tooth shoe in the prior art, but this design will reduce the overall performance of the motor, which is not worth the loss. On the other hand, traditional iron cores are often formed using a one-time rolling and punching technology, and the overall iron core can only be made of a single traditional silicon steel material, with a relatively low magnetic density and relatively weak overall performance. It can be seen that the prior art also has certain limitations in the breakthrough of new material applications.

[0003] Therefore, the market is in urgent need of a new stator structure that can facilitate the overall nesting of flat wires, improve production efficiency, and at the same time improve the magnetic flux capacity of the core, improve motor performance, and increase output torque through the application of new materials. Summary of the invention

[0004] The purpose of the utility model is to provide a plug-in stator core structure for a disc motor, in which the stator teeth and yoke are spliced ​​using a slot structure. The teeth and tooth shoes are made of oriented steel as a whole, and the magnetic flux density direction is along the axial tooth shape direction; the stator yoke is formed by non-oriented steel roll punching, and the connection position of the teeth and yoke is ensured to be within the range of the teeth, reducing the local loss caused by the oriented rigid characteristics at the bending point of the magnetic lines of force, increasing the output torque, and at the same time expanding the stator tooth shoe area, improving the electromagnetic performance of the whole machine.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a plug-in stator core structure of a disc motor, characterized in that: the stator core includes a stator tooth portion 1 and a stator yoke portion 4, a raised stator tooth portion base 2 is provided on the surface of the stator yoke portion 4, and the stator tooth portion 1 and the stator tooth portion base 2 are connected by splicing; a tooth shoe 5 extending to both sides is provided at the top of the stator tooth portion 1, and the tooth shoe spacing is as small as possible, so that the stator winding is wound from the bottom to the top or directly inserted from the bottom of the stator tooth portion; the stator tooth portion 1 and the tooth shoe 5 are made of oriented silicon steel.

[0006] Preferably, a connecting ridge 11 is provided at the bottom end of the stator tooth 1, and a connecting groove 21 matching the connecting ridge 11 is provided at the top end of the stator tooth base 2; the connecting groove 21 is a dovetail groove, a T-shaped groove or a wedge-shaped groove, and the depth of the connecting groove 21 is less than or equal to the height of the stator tooth base 2.

[0007] Preferably, the top surface of the stator tooth base 2 is a sector-shaped surface, and the bottom surface shape of the stator tooth 1 matches the sector-shaped surface: the connecting groove 21 runs through the entire sector-shaped surface, and the width of the connecting groove 21 is consistent from beginning to end.

[0008] Furthermore, the stator yoke 4 and the stator tooth base 2 are made of non-oriented silicon steel or soft magnetic material to reduce local losses at the bending points of the magnetic lines of force; the height of the stator tooth base is greater than or equal to the depth of the dovetail groove. On the basis of meeting the axial magnetic tensile strength, in this embodiment, the height ratio of the stator tooth and the stator tooth base is 2-8:1.

[0009] Furthermore, the orientation silicon steel magnetic circuit direction of the stator tooth 1 and the tooth shoe 5 is arranged along the axial direction of the stator tooth.

[0010] Furthermore, there is a gap between adjacent tooth shoes 5, and the gap is less than 1 mm.

[0011] Furthermore, the stator is designed to have the teeth 1 and the tooth shoes 5 connected as one, formed by rolling and punching of oriented silicon steel, and the stator yoke is formed by rolling and punching or sintering. The stator teeth and the stator yoke are processed separately after forming, which can improve the overall production efficiency.

[0012] Compared with the prior art, the technical solution of the utility model not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0013] According to the improved scheme described in the utility model, the stator core includes a stator tooth portion and a stator yoke portion, and the stator tooth portion and the stator yoke portion are connected by splicing; a tooth shoe extending to both sides is provided at the top of the stator tooth portion, so that the stator winding is wound from the bottom to the top from the bottom of the stator tooth portion; the stator winding is generally wound by embedding a flat wire from the stator tooth shoe portion, and the tooth portion and the yoke portion are spliced ​​at the straight tooth portion, so that the stator winding can be directly inserted therein as a whole, which greatly improves the production processability and production efficiency.

[0014] The external winding is inserted as a whole. Compared with winding through the tooth boot, it can increase the slot fill rate of the winding and improve the motor performance. Compared with the method of directly embedding the coil on a single tooth, it reduces the solder joints between the wire packages and improves reliability and processability.

[0015] In the technical solution of the utility model, the stator teeth and tooth shoes are made of oriented silicon steel. The oriented silicon steel has the characteristics of low hysteresis loss, strong magnetic saturation induction and high magnetic permeability. The stator yoke and the stator tooth base are made of non-oriented silicon steel, which reduces the local loss at the bending point of the magnetic lines of force, and the motor has a larger margin. When the current continues to increase, the motor output torque can be further improved.

[0016] In the technical solution of the utility model, since there is no need to embed the winding from the position of the stator tooth shoe, the area of ​​the tooth shoe can be increased, the gap between adjacent tooth shoes can be reduced, and the motor performance is improved.

[0017] The utility model has a simple structure, a reasonable layout, a low manufacturing cost, and significantly improves the electromagnetic performance and assembly process performance of the whole machine, and is easy to promote and utilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a dispersed structure of an embodiment of the utility model.

[0019] Figure 2 The figure is a schematic diagram of the assembly structure of the stator teeth and the stator yoke according to an embodiment of the utility model.

[0020] Figure 3 for Figure 2 A partial enlarged schematic diagram of .

[0021] Figure 4 Schematic diagram of magnetic lines of force of stator teeth in the prior art.

[0022] Figure 5 It is a schematic diagram of the magnetic lines of force of the stator teeth when the utility model adopts the tooth splicing structure.

[0023] Reference numerals:

[0024] 1 stator tooth, 2 stator tooth base, 3 stator winding, 4 stator yoke, 5 tooth shoe;

[0025] 11 connecting convex strips;

[0026] 21 connecting groove;

[0027] 51 gap. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model provides a plug-in stator core structure of a disc motor, wherein the stator core comprises a stator tooth portion 1 and a stator yoke portion 4, wherein a protruding stator tooth portion base 2 is provided on the surface of the stator yoke portion 4, and the stator tooth portion 1 is connected to the stator tooth portion base 2 by splicing; a tooth shoe 5 extending to both sides is provided at the top of the stator tooth portion 1, so that the stator winding is wound from the bottom of the stator tooth portion to the top, or the winding coil is made into a whole, and the whole is inserted, thereby reducing welding points, improving reliability, ensuring the compactness of the stator winding, and increasing the slot filling rate; the stator tooth portion 1 and the tooth shoe 5 are made of oriented silicon steel. The stator tooth portion and the tooth shoe can be connected as one, thereby increasing the tooth shoe area. The tooth portion connected as one can be directly formed by an overall rolling and punching process.

[0030] During implementation, the stator core of the utility model is composed of two parts: the stator tooth part and the stator yoke part. The stator tooth part is made of oriented silicon steel, and the stator yoke part is made of non-oriented silicon steel. The different characteristics of the two materials are used to reduce the magnetic density defects caused by the turning of the magnetic lines of force and increase the output torque. Specifically, the stator tooth part and the stator yoke part are detachable structures, so that the flat wire can be directly wound from the lower end of the stator tooth part when forming the winding, which is not only more convenient to wind, but also increases the slot fill rate. At the same time, the tooth shoe part of the stator tooth part can increase the area. By taking advantage of the relatively low magnetic leakage of the oriented steel tooth shoe position, the adjacent tooth shoe parts can be connected into one, and there is no need to consider the problem of flat wire passing. The tooth shoe of the utility model can be made wider than the tooth shoe of the prior art, reducing torque pulsation and improving the electromagnetic performance of the whole machine.

[0031] In the prior art, in order to consider the problem of winding over-wire, space for winding needs to be left between adjacent tooth shoes. For example, if a 1.5*3.8mm flat wire is used, the spacing between adjacent tooth shoes needs to be reserved to be more than 3.8mm, which will cause serious magnetic leakage. However, with this patent solution, the tooth shoe gap can be reduced to 0.1mm or even zero, which can greatly improve the motor performance. Example 1

[0032] In this embodiment, the stator core includes a stator tooth portion 1 and a stator yoke portion 4. A raised stator tooth base 2 is provided on the surface of the stator yoke portion 4. The stator tooth portion 1 is connected to the stator tooth base 2 by splicing. A tooth shoe 5 extending to both sides is provided at the top of the stator tooth portion 1, so that the stator winding is wound from the bottom to the top from the bottom of the stator tooth portion, or the whole is made into a winding wire package and inserted as a whole, which reduces welding points, improves reliability, and increases slot fill rate. The stator tooth portion 1 and the tooth shoe 5 are made of oriented silicon steel.

[0033] Specifically, during splicing, a connecting ridge 11 is provided at the bottom end of the stator tooth 1, and a connecting groove 21 matching the connecting ridge 11 is provided at the top end of the stator tooth base 2, thereby reducing spare parts and improving assembly accuracy; the connecting groove 21 is a dovetail groove, a T-shaped groove or a wedge-shaped groove, and the depth of the connecting groove 21 is less than or equal to the height of the stator tooth base 2.

[0034] In this embodiment, the stator teeth are used as a detachable part. When the stator teeth are spliced, the material properties of the anisotropic oriented silicon steel in the rolling direction can be fully utilized. At this time, the direction of the magnetic moment and the direction of the magnetic field can be kept consistent, and the magnetic lines do not need to be bent and closed in the stator tooth yoke part. The anisotropic oriented silicon steel can be fully utilized to achieve the best advantage in the magnetic properties in a specific direction, thereby increasing the output torque of the stator.

[0035] The features are further described here as follows: the top surface of the stator tooth base 2 is a fan-shaped surface, one end is larger than the other end, and the bottom surface shape of the stator tooth 1 matches the fan-shaped surface: the connecting groove 21 runs through the entire fan-shaped surface, and the width of the connecting groove 21 is consistent from beginning to end and will not change with the change of the fan-shaped surface, thereby ensuring that the splicing between the stator tooth and the stator tooth base is firm and reliable.

[0036] Since the stator teeth 1 and the stator yoke 4 are separated, the stator winding 3 can be wound from the bottom of the stator teeth from bottom to top without being affected by the stator tooth shoes. Therefore, the tooth shoes at the top of the stator teeth can be extended to both ends without considering the wire crossing. The tooth shoe area can be expanded, and even adjacent tooth shoes can be connected as one, so that the motor performance is further improved. At the same time, the stator teeth 1 and the tooth shoes 5 are also connected as one, and are formed by rolling and punching of oriented silicon steel, and the stator yoke is formed by rolling and punching or sintering.

[0037] In practice, the stator teeth 1 and the tooth shoe 5 are made of oriented silicon steel, the stator yoke 4 is made of non-oriented silicon steel, and the magnetic field lines of the oriented silicon steel of the stator teeth 1 and the tooth shoe 5 are arranged along the axis direction of the stator teeth. The material properties of the oriented silicon steel in the rolling direction can be fully utilized, and the direction of the magnetic moment can be consistent with the direction of the magnetic field, thereby increasing the output torque. Example 2

[0038] The stator tooth 1 is made of oriented silicon steel, and the stator yoke 4 and the stator tooth bottom bracket 2 are made of non-oriented silicon steel or soft magnetic material; this can make full use of the material properties of anisotropic oriented silicon steel in the rolling direction, so that the splicing point is set in the straight area of ​​the magnetic force line, increase stability, and maximize the magnetic capacity of oriented silicon steel. At this time, the direction of the magnetic moment can be consistent with the direction of the magnetic field, reduce the local loss caused by the oriented rigid characteristics at the bending of the magnetic force line, increase the magnetic density, and the magnetic force line does not need to be bent and closed in the stator tooth yoke part, which can fully utilize the anisotropic oriented silicon steel in a specific direction. The magnetic property achieves the best advantage, so that the output torque of the stator is increased. The soft magnetic material here can be a composite soft magnetic material (SMC soft magnetic material). SMC soft magnetic material is a new type of soft magnetic material prepared by powder metallurgy technology using high-purity iron powder as raw material, surface insulation and compression forming, and heat treatment. Since this material is an existing technology, it will not be repeated here.

[0039] The top of the stator tooth is provided with a tooth boot 5 extending to both sides. The tooth boot is symmetrically arranged on both sides of the top of the stator tooth in a wing shape. The gap between adjacent tooth boots 5 is less than 1 mm, which is much smaller than the diameter of the flat wire. To prevent the flat wire from slipping out, the flat wire can be wound on the stator tooth directly from the bottom to the top at the lower end of the stator tooth, which improves the slot fill rate of the winding and improves the performance of the motor. Another effect is that since the size of the stator tooth boot 5 is no longer restricted, a wider area of ​​tooth boot 5 can be made, and the width of the tooth boot 5 can ensure that the spacing is as small as possible within the allowable range. In this case, the spacing can be within 1 mm, and even in extreme cases, the tooth boots can be connected.

[0040] Furthermore, in order to meet the axial magnetic pull strength, the height ratio of the stator tooth 1 and the stator tooth base 2 structure in this embodiment is 2-8:1; the preferred value is 3.5-6:1, and the specific value needs to be formulated on the basis of satisfying the magnetic flux capacity, axial magnetic pull and structural assembly strength. In addition, the specific value is specifically designed according to the actual design power and diameter, and the number of slots. Here, the connecting groove 21 of the stator tooth is a dovetail groove, a T-shaped groove or a wedge-shaped groove, and the depth of the connecting groove is less than the height of the stator tooth base, so that the magnetic lines of force are avoided as much as possible from passing through the magnetic vertical surface of the oriented steel.

[0041] In summary, the advantages of the utility model are as follows:

[0042] The winding direction of the stator winding is changed, and the winding is carried out from the bottom of the stator teeth from bottom to top, which improves the process convenience and the slot fill rate of the winding. The completed winding is more compact and the motor performance is improved;

[0043] Oriented steel is used for the stator teeth, and non-oriented steel is used for the stator yoke. The different characteristics of the two materials are used to enhance the magnetic flux density in the direction of the magnetic flux lines, reduce the magnetic flux density defects when the magnetic flux lines are bent, and increase the output torque.

[0044] The tooth boots can be made wider than those in the prior art, and the gaps between adjacent tooth boots are reduced or even eliminated, thereby improving the electromagnetic performance of the entire machine.

[0045] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A plug-in stator core structure of a disc motor, characterized in that: The stator core comprises a stator tooth portion (1) and a stator yoke portion (4); a protruding stator tooth portion base (2) is provided on the surface of the stator yoke portion (4); and the stator tooth portion (1) and the stator tooth portion base (2) are connected by splicing; The top end of the stator tooth portion (1) is provided with a tooth shoe (5) extending to both sides; The stator tooth portion (1) and the tooth shoe (5) are made of oriented silicon steel.

2. The plug-in stator core structure of a disc motor according to claim 1, characterized in that: A connecting convex strip (11) is provided at the bottom end of the stator tooth portion (1), and a connecting groove (21) matching with the connecting convex strip (11) is provided at the top end of the stator tooth portion base (2); The connecting groove (21) is a dovetail groove, a T-shaped groove or a wedge-shaped groove, and the depth of the connecting groove (21) is less than or equal to the height of the stator tooth base (2).

3. The plug-in stator core structure of a disc motor according to claim 2, characterized in that The top surface of the stator tooth base (2) is a sector-shaped surface, and the bottom surface of the stator tooth (1) matches the sector-shaped surface: The connecting groove (21) runs through the entire sector-shaped surface, and the width of the connecting groove (21) is consistent from beginning to end.

4. The plug-in stator core structure of a disc-type motor according to claim 1, characterized in that: The stator yoke (4) and the stator tooth base (2) are made of non-oriented silicon steel or soft magnetic material; the height ratio of the stator tooth (1) to the stator tooth base (2) is 2-8:

1.

5. The plug-in stator core structure of a disc motor according to claim 1, characterized in that: The orientation silicon steel magnetic circuit direction of the stator tooth portion (1) and the tooth shoe (5) is arranged along the axial direction of the stator tooth portion.

6. The plug-in stator core structure of a disc-type motor according to claim 1, characterized in that: There is a gap between adjacent tooth shoes (5), and the gap is less than 1 mm.

7. The plug-in stator core structure of a disc-type motor according to claim 1, characterized in that: Adjacent tooth shoes are connected to each other as a whole.

8. The plug-in stator core structure of a disc-type motor according to claim 1, characterized in that: The stator tooth portion (1) and the tooth shoe (5) are connected as one body and are formed by rolling and punching of oriented silicon steel, and the stator yoke portion is formed by rolling and punching or sintering.

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