Stator

Abstract

To provide a stator capable of filling the gap between a split coil and a stator core.SOLUTION: A stator 1 includes a stator core 10 provided with a plurality of slots 11 extending in the axial direction, a coil portion 20 arranged in each of the plurality of slots 11, a connecting member 30 for connecting the split wires 20 within the slots 11, and a slot paper 40 inserted between the coil portion 20 and the stator core 10 within the slots 11 and having a foam layer. The connecting member 30 is connected to the coil portion 20. A diameter W2 of the connecting member 30 is larger than a diameter W1 of the coil portion 20. A connection surface between the connecting member 30 and the coil portion 20 has a higher electrical resistance than the coil portion 20.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a stator. [Background technology]

[0002] In Patent Document 1, when connecting the split coils inside the stator using a connecting member, exposed conductor portions are generated at the connection points between the connecting member and the split coils inside the slots. Therefore, in Patent Document 1, when the diameter of the connecting member is smaller than the diameter of the split coils, in order to fill the gap between the stator core and the connecting member, an insulating member is wound around the joint to fill the gap between the connecting member and the stator core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-221114 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, although there is no gap between the connecting member and the stator core, the gap between the split coil and the stator core is large, and this large gap cannot be sufficiently filled, so there is a possibility that electrons may move from the exposed part of the conductor.

[0005] The present disclosure has been made in consideration of the above, and has an object to provide a stator that can fill the gap between the split coils and the stator core. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the stator of the present disclosure comprises a stator core having a plurality of slots extending in the axial direction, a split conductor arranged in each of the plurality of slots, a connecting member connecting the split conductor within the slot, and a slotted paper having a foam layer inserted between the split conductor and the stator core within the slot, wherein the connecting member is connected to the split conductor, the diameter of the connecting member is larger than the diameter of the split conductor, and the connection surface between the connecting member and the split conductor has a higher electrical resistance than the split conductor. Effect of the Invention

[0007] According to the present disclosure, it is possible to obtain an effect of filling the gap between the connecting member and the stator core. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a stator according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of a portion of the stator taken along line AA' in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a stator according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same. Also, each figure referred to in the following description merely shows the shape, size, and positional relationship in a schematic manner to the extent that the contents of the present disclosure can be understood. In other words, the present disclosure is not limited to only the shape, size, and positional relationship exemplified in each figure.

[0010] [Stator Configuration] FIG. 1 is a cross-sectional view of a stator according to an embodiment. FIG. 2 is a cross-sectional view of a portion of the stator taken along line A-A' in FIG. 1. The stator 1 shown in FIGS. 1 and 2 has an annular shape centered on a central axis C1. In the following, the axial direction is the direction along the central axis C1 as shown in FIG. 1. The circumferential direction is the circumferential direction of the stator 1, and is the up-down direction perpendicular to the axial direction. The radial direction is the radial direction of the stator 1.

[0011] As shown in FIGS. 1 and 2, the stator 1 includes a stator core 10, a coil portion 20, a connecting member 30, and a slot paper 40.

[0012] The stator core 10 is provided with a plurality of slots 11 extending in the axial direction. The stator core 10 has a cylindrical shape centered on a central axis C1. The stator core 10 is formed by stacking a plurality of electromagnetic steel plates, for example silicon steel plates, in the axial direction. As shown in FIG. 2, the stator core 10 has a plurality of slots 11 extending in the axial direction. Each of the slots 11 is formed with an opening on both axial sides. Furthermore, each of the slots 11 is provided with an opening 12 that opens radially inward.

[0013] The coil section 20 functions as a divided conductor (divided coil) divided into upper and lower parts and connected within the slot 11, and is disposed in each of the multiple slots 11. The coil section 20 forms an annular shape centered on the central axis C1, which is the same as that of the stator core 10. The coil section 20 is configured, for example, as a wave-wound coil. The coil section 20 is configured by arranging six segments (three in FIG. 2) in the radial direction within the slot 11. The coil section 20 is configured to generate magnetic flux while current flows in the axial direction and in the circumferential direction when power is supplied from a power source section (not shown). The coil section 20 is configured using a flat copper wire having a substantially rectangular cross section. Specifically, the coil section 20 is made of a conductive material, for example, a metal material such as copper or aluminum. Furthermore, a gap is generated between the coil section 20 and the slot 11.

[0014] The connecting member 30 electrically connects the coil portion 20 to another coil portion 20 within the slot 11. The connecting member 30 is formed using a flat copper H wire having a substantially rectangular cross section. Specifically, the connecting member 30 is made of a conductive material, for example, a metal material such as copper. The diameter W2 of the connecting member 30 is larger than the diameter W1 of the coil portion 20. The connecting member 30 has a small cross-sectional area and has a contact resistance, so that it has a high resistance. Furthermore, the connection surface (contact surface) between the connecting member 30 and the coil portion 20 has a higher electrical resistance than the coil portion 20 due to the contact resistance.

[0015] The slot paper 40 is inserted between the coil portion 20 and the stator core 10 in the slot 11, and is formed so as to cover the coil portion 20 and the connecting member 30 in the slot 11. The slot paper 40 has a foam layer containing foam beads that expand when heated, and is made of a sheet-like insulating material such as aramid paper or polymer film. The slot paper 40 functions to ensure insulation between the coil portion 20 and the stator core 10.

[0016] In the stator 1 configured in this manner, the clearance between the stator core 10 and the coil portion 20 is narrow, so the foaming ratio of the slot paper 40 is increased. Furthermore, the connecting member 30 has a small cross-sectional area, contact resistance is present, resistance is high, and heat is generated locally. Therefore, when the stator 1 is energized, the electrical resistance of the contact surface between the connecting member 30 and the coil portion 20 is high, so the connecting member 30 starts to heat up earlier than the coil portion 20, and heat generation at a predetermined temperature or higher is maintained for a longer period of time than the coil portion 20. Furthermore, the foaming condition of the slot paper 40 depends on the temperature, and foaming occurs when the temperature reaches a predetermined temperature or higher. Therefore, the temperature at the time of foaming of the slot paper 40 is high and foaming continues for a long period of time, so the foaming ratio of the slot paper 40 is increased. That is, the foaming layer of the slot paper 40 is sufficiently foamed. As a result, the foaming ratio of the slot paper 40 is increased in the stator 1, so that radial sealing can be performed. That is, the stator 1 can fill the gap between the stator core 10 and the coil portion 20 with the foaming layer of the slot paper 40. Furthermore, the stator 1 can reliably seal in the radial direction due to the expansion of the diameter by the connecting member 30. This allows the stator 1 to seal the electron path in the radial direction, as shown by the arrow A1 in Fig. 2. As a result, the stator 1 can ensure insulation in the radial direction simply by winding the slot paper 40 in the usual way.

[0017] According to the embodiment described above, the connecting member 30 electrically connects the coil portion 20 to the other coil portions 20 within the slots 11, the diameter W2 of the connecting member 30 is larger than the diameter W1 of the coil portions 20, and the contact surface between the connecting member 30 and the coil portions 20 has a higher electrical resistance than the coil portions 20, so that the foam layer of the slot paper 40 is sufficiently foamed. As a result, the stator 1 can fill the gap between the stator core 10 and the coil portions 20 with the foam layer of the slot paper 40, and therefore the gap between the stator core 10 and the coil portions 20 can be filled with the foam layer of the slot paper 40.

[0018] Further advantages and modifications may readily occur to those skilled in the art. The invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Thus, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

[0019] Although some of the embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be embodied in other forms that incorporate various modifications and improvements based on the knowledge of those skilled in the art, including the forms described in the disclosure of the present invention. [Explanation of symbols]

[0020] 1 Stator 10 Stator core 11 Slots 12 Opening 20 Coil section 30 Connecting members 40 slot paper

Claims

[Claim 1] A stator core having a plurality of axially extending slots; a divided conductor disposed in each of the plurality of slots; a connecting member that connects the divided conductors within the slot; a slot paper having a foam layer, the slot paper being inserted between the divided conductor and the stator core in the slot; A stator comprising: The connecting member is connected to the split conductor, The diameter of the connecting member is larger than the diameter of the divided conductor, The connection surface between the connecting member and the divided conductor is Higher electrical resistance than the split conductor; Stator.

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