Splicing unit of spliced stator, spliced stator and motor

Abstract

The utility model relates to a splicing unit of a spliced stator, the spliced stator and a motor. Each splicing unit of the spliced stator comprises an iron core spliced block, an insulation structure and a coil. Each iron core block comprises a yoke part and a tooth part, the yoke part extends along an arc shape, one end of the tooth part is connected with the inner surface of one side of the yoke part along the radial direction, and the other end of the tooth part faces the center of the block stator; the coil is wound on the periphery of the tooth part, and the insulation structure is arranged between the coil and the iron core splicing block; along the radial direction of the block stator, the width of the tooth part along the circumferential direction of the block stator becomes smaller. The reduction of the width of the tooth part makes space for the winding of the coil, thereby reducing or avoiding the coil extrusion between the ends, close to the center of the spliced stator, of the two adjacent splicing units, and reducing the risk of poor insulation and voltage resistance.

Description

Technical Field

[0001] The present application relates to the technical field of motor stators, and in particular to a splicing unit of a block stator, a block stator, and a motor. Background Art

[0002] The block stator has the advantages of high slot fill rate, convenient and efficient winding, low wire package end, small copper loss, low temperature rise, low cogging torque and small torque fluctuation.

[0003] The block stator generally includes a plurality of splicing units connected end to end in a circumferential direction. Each splicing unit includes an iron core block, an insulating structure and a coil. The iron core block includes a yoke and a tooth portion, the yoke portion extends along an arc, and the yoke portions of a plurality of iron core blocks are connected end to end in sequence, so that a plurality of block units are connected end to end in sequence. One end of the tooth portion is connected to the inner surface of the yoke portion along one radial side, and the other end faces the center of the block stator. The coil is wound around the periphery of the tooth portion. The insulating structure is arranged between the coil and the iron core block.

[0004] The slot fill rate of the block stator is usually high, which makes it easy for the coils of two adjacent spliced ​​units to be squeezed, causing the problem of poor insulation withstand voltage. Utility Model Content

[0005] Based on this, it is necessary to provide a splicing unit, a splicing stator and a motor for a splicing stator in order to address the problem that the slot filling rate of the splicing stator in the prior art is high, which makes it easy for the coils of adjacent splicing units to be squeezed and causes poor insulation withstand voltage.

[0006] A splicing unit of a block stator, characterized in that it comprises: an iron core block, an insulating structure and a coil; the iron core block comprises a yoke and a tooth portion, the yoke extends along an arc, one end of the tooth portion is connected to the inner surface of the yoke along one radial side, and the other end of the tooth portion faces the center of the block stator; the coil is wound around the periphery of the tooth portion, and the insulating structure is arranged between the coil and the iron core block; wherein, along the radial inward direction of the block stator, the width of the tooth portion along the circumferential direction of the block stator decreases from large to small.

[0007] In one embodiment, the tooth portion includes a main body section and a narrowed section, one end of the main body section is connected to the inner surface of the yoke portion along the radial side, the other end of the main body section is connected to one end of the narrowed section, and the narrowed section is facing away from the end of the main body section toward the center of the block stator; wherein the width of the narrowed section along the circumferential direction of the block stator is smaller than the width of the main body section along the circumferential direction of the block stator.

[0008] In one embodiment, the insulation structure includes two lateral insulation portions respectively located on two sides of the tooth portion along the circumferential direction of the split stator; each lateral insulation portion includes a tooth fitting portion and a yoke fitting portion, the yoke fitting portion is in contact with the yoke portion, and the tooth fitting portion is in contact with the side surface of the tooth portion facing the circumferential direction of the split stator.

[0009] In one embodiment, the tooth fitting portion includes a main section fitting portion and a narrowing section fitting portion. The main section fitting portion is in contact with the side surface of the main section facing the circumferential direction of the split stator, and the narrowing section fitting portion is in contact with the side surface of the narrowing section facing the circumferential direction of the split stator, so that a stepped surface is formed at the connection between the main section fitting portion and the narrowing section fitting portion.

[0010] In one embodiment, along the radial direction of the split stator inward, the length of the tooth portion along the axial direction of the split stator increases from small to large.

[0011] In one embodiment, both ends of the narrowing section along the axial direction of the split stator protrude from both ends of the main section along the axial direction of the split stator.

[0012] In one embodiment, the insulation structure includes two end insulation portions respectively located at both ends of the iron core segment along the axial direction of the split stator; each end insulation portion includes a tooth covering portion, and the tooth covering portion includes a main section covering portion and a narrowing section covering portion. The main section covering portion is in contact with the end face of the main section facing the axial direction of the split stator, and the narrowing section covering portion is in contact with the end face of the narrowing section facing the axial direction of the split stator, so that a stepped surface is formed at the connection between the main section covering portion and the narrowing section covering portion.

[0013] In one embodiment, the lateral insulation portion is a plastic insulation framework.

[0014] In one embodiment, the lateral insulation portion includes an insulation framework and insulation paper, and the insulation paper is located between the insulation framework and the iron core segment.

[0015] In one embodiment, the lateral insulation portion includes an insulation coating applied on the iron core segment.

[0016] A split stator includes a plurality of splicing units according to any one of the above embodiments, and the plurality of splicing units are sequentially connected end to end in the circumferential direction.

[0017] An electric motor is characterized by including the split stator described above.

[0018] For the splicing unit, the segmented stator, and the motor of the above segmented stator, along the radial direction of the segmented stator inward, the width of the tooth part in the circumferential direction of the segmented stator decreases from large to small. That is, the closer to the center of the segmented stator, the smaller the width of the tooth part in the circumferential direction of the segmented stator. Thus, the decrease in the width of the tooth part makes room for the winding of the coil, and further reduces or avoids the coil extrusion between the ends of two adjacent splicing units close to the center of the segmented stator, and can reduce the risk of poor insulation withstand voltage. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a segmented stator of an embodiment.

[0020] Figure 2 For Figure 1 It is a schematic structural diagram of the splicing unit of the segmented stator shown.

[0021] Figure 3 For Figure 2 Top view.

[0022] Figure 4 For Figure 2 It is a schematic structural diagram of the iron core segment in.

[0023] Figure 5 For Figure 4 Top view.

[0024] Figure 6 For Figure 4 Side view.

[0025] Figure 7 For Figure 2 It is a schematic structural diagram of the lateral insulation part in.

[0026] Reference Signs: 100, iron core segment; 110, yoke part; 120, tooth part; 121, main body section; 122, narrowing section; 200, insulation structure; 210, lateral insulation part; 211, tooth fitting part; 2111, main body section fitting part; 2112, narrowing section fitting part; 212, yoke fitting part; 213, side plate; 300, coil. Detailed Embodiments

[0027] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed embodiments of the present application in conjunction with the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 construed as a limitation to the present application.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0030] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0032] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0033] The segmented stator generally includes a plurality of splicing units that are sequentially connected end to end in the circumferential direction. Each splicing unit includes a core segment, an insulating structure, and a coil. The core segment includes a yoke portion and a tooth portion. The yoke portion extends along an arc, and the yoke portions of the plurality of core segments are sequentially connected end to end, so that the plurality of segment units are sequentially connected end to end. One end of the tooth portion is connected to the inner surface of the yoke portion on one side in the radial direction, and the other end faces the center of the segmented stator. The coil is wound around the periphery of the tooth portion. The insulating structure is disposed between the coil and the core segment. The slot fill factor of the segmented stator is usually relatively high, resulting in easy extrusion between the coils of two adjacent splicing units, causing problems such as poor insulation withstand voltage.

[0034] It is found by the inventor's research that in the segmented stator, since a plurality of splicing units are arranged sequentially in the circumferential direction, therefore, the closer to the center of the segmented stator in the radial direction, the smaller the winding space of the coil located around the tooth portion, which results in the coil extrusion mainly occurring between the ends of two adjacent splicing units close to the center of the segmented stator.

[0035] In view of this, please refer to Figure 1 and Figure 2 , an embodiment of the present application provides a splicing unit 10 of a segmented stator. The splicing unit 10 includes: a core segment 100, an insulating structure 200, and a coil 300. Combining Figure 3 and Figure 4 , the core segment 100 includes a yoke portion 110 and a tooth portion 120. The yoke portion 110 extends along an arc. One end of the tooth portion 120 is connected to the inner surface of the yoke portion 110 on one side in the radial direction, and the other end of the tooth portion 120 faces the center of the segmented stator. The coil 300 is wound around the periphery of the tooth portion 120, and the insulating structure 200 is disposed between the coil 300 and the core segment 100. Wherein, along the radial direction of the segmented stator inward, the width of the tooth portion 120 in the circumferential direction of the segmented stator becomes smaller from large.

[0036] For the splicing unit 10 of the above-mentioned segmented stator, radially inward along the segmented stator, the width of the tooth portion 120 in the circumferential direction of the segmented stator decreases from large to small. That is, the closer to the center of the segmented stator, the smaller the width of the tooth portion 120 in the circumferential direction of the segmented stator. Thus, the reduction in the width of the tooth portion 120 creates space for winding the coil 300, thereby reducing or avoiding the coil extrusion between the ends of two adjacent splicing units 10 close to the center of the segmented stator, and being able to reduce the risk of poor insulation withstand voltage.

[0037] Reference Figures 2 to 4 , in an embodiment, the tooth portion 120 includes a main body section 121 and a narrowing section 122. One end of the main body section 121 is connected to the inner surface of one side of the yoke portion 110 in the radial direction. The other end of the main body section 121 is connected to one end of the narrowing section 122. The end of the narrowing section 122 facing away from the main body section 121 faces the center of the segmented stator. Wherein, the width d2 of the narrowing section 122 in the circumferential direction of the segmented stator is smaller than the width d1 of the main body section 121 in the circumferential direction of the segmented stator.

[0038] The narrowing section 122 is located on the side of the main body section 121 close to the center of the segmented stator. Due to the reduction in the width d2 of the narrowing section 122, the space for accommodating the coil 300 on both sides of the narrowing section 122 increases, thereby reducing or avoiding the coil extrusion between the ends of two adjacent splicing units 10 close to the center of the segmented stator, and being able to reduce the risk of poor insulation withstand voltage.

[0039] In an embodiment, along the radial direction of the segmented stator, the width d2 of the narrowing section 122 is uniform, and the width d1 of the main body section 121 is uniform.

[0040] Optionally, the width of the narrowing section 122 can also be non-uniform, and the width of the main body section 121 can also be non-uniform.

[0041] In other embodiments, along the radial direction of the segmented stator, the width of the tooth portion can also be gradually changed.

[0042] Since radially inward along the segmented stator, the width of the tooth portion 120 in the circumferential direction of the segmented stator decreases from large to small, the magnetic flux density at the position where the width of the tooth portion 120 is smaller will become smaller. To increase the magnetic flux density, reference Figure 2 , Figure 4 and Figure 6 , in an embodiment, radially inward along the segmented stator, the length of the tooth portion 120 in the axial direction of the segmented stator increases from small to large. That is, the closer to the center of the segmented stator, the longer the length of the tooth portion 120 in the axial direction of the segmented stator. The increase in the length of the tooth portion 120 can increase the magnetic flux density, thereby compensating for the decrease in the magnetic flux density caused by the reduction in the width of the tooth portion 120.

[0043] Reference Figure 2 , Figure 4 and Figure 6, in one embodiment, the length L2 of the narrowing section 122 is greater than the length L1 of the main body section 121, so that both ends of the narrowing section 122 along the axial direction of the segmented stator protrude beyond both ends of the main body section 121 along the axial direction of the segmented stator, thereby improving the magnetic flux density at the narrowing section 122. Thus, the increase in the length of the narrowing section 122 compensates for the decrease in the magnetic flux density caused by the decrease in the width of the narrowing section 122.

[0044] Reference Figure 2 , Figure 3 and Figure 7 , in one embodiment, the insulation structure 200 includes two lateral insulation portions 210, and the two lateral insulation portions 210 are respectively located on both sides of the tooth portion 120 along the circumferential direction of the segmented stator. The lateral insulation portion 210 includes a tooth fitting portion 211 and a yoke fitting portion 212. The yoke fitting portion 212 is in contact with the yoke portion 110, so as to insulate between the coil 300 and the yoke portion 110. The tooth fitting portion 211 is in contact with the side surface of the tooth portion 120 facing the circumferential direction of the segmented stator, so as to insulate between the coil 300 and the tooth portion 120.

[0045] Reference Figure 2 , Figure 3 and Figure 7 , in one embodiment, the lateral insulation portion 210 includes a side plate 213. One end of the side plate 213 is connected to the end of the yoke fitting portion 212 away from the tooth fitting portion 211, and the side plate 213 is opposite to the tooth fitting portion 211. Thus, the coil 300 is located between the tooth fitting portion 211 and the side plate 213, and the side plate 213 can insulate and isolate the coil 300 from the coils of adjacent splicing units.

[0046] Reference Figure 2 , Figure 3 and Figure 7 , in one embodiment, the tooth fitting portion 211 includes a main body section fitting portion 2111 and a narrowing section fitting portion 2112. The main body section fitting portion 2111 is in contact with the side surface of the main body section 121 facing the circumferential direction of the segmented stator, and the narrowing section fitting portion 2112 is in contact with the side surface of the narrowing section 122 facing the circumferential direction of the segmented stator, so that a stepped surface is formed at the connection between the main body section fitting portion 2111 and the narrowing section fitting portion 2112.

[0047] It can be understood that since the width d2 of the narrowing section 122 is smaller than the width d1 of the main body section 121, a stepped surface is formed at the connection between the side surface of the narrowing section 122 facing the circumferential direction of the segmented stator and the side surface of the main body section 121 facing the circumferential direction of the segmented stator. In this embodiment, by forming a stepped surface at the connection between the main body section fitting portion 2111 and the narrowing section fitting portion 2112, the tooth fitting portion 211 is adapted to the tooth portion 120, and good isolation is achieved between the side surface of the tooth portion 120 facing the circumferential direction of the segmented stator and the coil 300.

[0048] In one embodiment, the insulation structure 200 includes two end insulation portions which are respectively located at two ends of the core segment 100 along the axial direction of the segment stator. The end insulation portions cover the yoke portion 110 and the tooth portion 120, so that the surfaces of the yoke portion 110 and the tooth portion 120 at two ends along the axial direction of the segment stator are insulated from the outside.

[0049] In one embodiment, the end insulation portion includes a tooth covering portion. The tooth covering portion includes a main segment covering portion and a narrowing segment covering portion. The main segment covering portion fits onto the end face of the main segment 121 facing the axial direction of the segment stator, and the narrowing segment covering portion fits onto the end face of the narrowing segment 122 facing the axial direction of the segment stator, so that a stepped surface is formed at the connection between the main segment covering portion and the narrowing segment covering portion.

[0050] It can be understood that since the two ends of the narrowing segment 122 along the axial direction of the segment stator respectively protrude from the two ends of the main segment 121 along the axial direction of the segment stator, a stepped surface is formed at the connection between the end face of the narrowing segment 122 facing the axial direction of the segment stator and the end face of the main segment 121 facing the axial direction of the segment stator. In this embodiment, by forming a stepped surface at the connection between the main segment covering portion and the narrowing segment covering portion, the tooth covering portion is adapted to the tooth portion 120, and good insulation between the end face of the tooth portion 120 facing the axial direction of the segment stator and the outside is achieved.

[0051] In one embodiment, the lateral insulation portion is a plastic insulation skeleton.

[0052] In one embodiment, the lateral insulation portion 210 includes an insulation skeleton and insulation paper, and the insulation paper is located between the insulation skeleton and the core segment 100.

[0053] The plastic insulation skeleton can be manufactured by injection molding, encapsulation or other methods.

[0054] In one embodiment, the lateral insulation portion 210 includes an insulation coating coated on the core segment 100.

[0055] One embodiment of the present application provides a segment stator, which includes a plurality of splicing units 10 in any one of the above embodiments, and the plurality of splicing units 10 are sequentially connected end to end in the circumferential direction.

[0056] One embodiment of the present application provides an electric motor, which includes the segment stator in any one of the above embodiments.

[0057] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0058] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A splicing unit of a block stator, characterized in that: include: An iron core block, an insulating structure and a coil; the iron core block includes a yoke and a tooth portion, the yoke extends along an arc, one end of the tooth portion is connected to the inner surface of the yoke along one radial side, and the other end of the tooth portion faces the center of the block stator; the coil is wound around the periphery of the tooth portion, and the insulating structure is arranged between the coil and the iron core block; wherein, along the radial direction inward of the block stator, the width of the tooth portion along the circumferential direction of the block stator decreases from large to small.

2. The splicing unit according to claim 1, characterized in that: The tooth portion includes a main body section and a narrowed section, one end of the main body section is connected to the inner surface of the yoke portion along one radial side, the other end of the main body section is connected to one end of the narrowed section, and the end of the narrowed section is away from the main body section toward the center of the block stator; wherein the width of the narrowed section along the circumferential direction of the block stator is smaller than the width of the main body section along the circumferential direction of the block stator.

3. The splicing unit according to claim 2, characterized in that: The insulating structure includes two lateral insulating parts, which are respectively located on both sides of the tooth portion along the circumference of the block stator; the lateral insulating part includes a tooth fitting part and a yoke fitting part, the yoke fitting part is fitted with the yoke portion, and the tooth fitting part is fitted with the side of the tooth portion facing the circumference of the block stator.

4. The splicing unit according to claim 3, characterized in that: The tooth fitting portion includes a main section fitting portion and a narrowed section fitting portion, wherein the main section fitting portion fits to the side surface of the main section facing the circumferential direction of the block stator, and the narrowed section fitting portion fits to the side surface of the narrowed section facing the circumferential direction of the block stator, so that a step surface is formed at the connection between the main section fitting portion and the narrowed section fitting portion.

5. The splicing unit according to claim 1 or 2, characterized in that: Along the radial direction inward of the segment stator, the length of the tooth portion along the axial direction of the segment stator increases from small to large.

6. The splicing unit according to claim 2, characterized in that: Two ends of the narrowed section along the axial direction of the block stator respectively protrude from two ends of the main body section along the axial direction of the block stator.

7. The splicing unit according to claim 6, characterized in that: The insulating structure includes two end insulating parts, which are respectively located at the two ends of the core block along the axial direction of the block stator; the end insulating part includes a tooth covering part, which includes a main section covering part and a narrowed section covering part, the main section covering part is attached to the end face of the main section facing the axial direction of the block stator, and the narrowed section covering part is attached to the end face of the narrowed section facing the axial direction of the block stator, so that a step surface is formed at the connection between the main section covering part and the narrowed section covering part.

8. The splicing unit according to claim 3, characterized in that: The lateral insulating portion is a plastic insulating frame; or, The lateral insulating part comprises an insulating frame and insulating paper, and the insulating paper is located between the insulating frame and the core block; or, The lateral insulating portion includes an insulating coating applied on the core segments.

9. A block stator, characterized in that: It comprises a plurality of splicing units according to any one of claims 1 to 8, wherein the plurality of splicing units are sequentially connected end to end along a circumferential direction.

10. A motor, characterized in that: It comprises the segment stator as claimed in claim 9.

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