motor stator

Abstract

The utility model discloses a motor stator, including stator core and flat wire, be equipped with a plurality of stator slot in the stator core, the flat wire is in the stator slot inner layer and is arranged, the cross section of flat wire is trapezoidal, the same layer includes two combined flat wire in the stator slot, the shape and size of flat wire in the stator slot are same. In the utility model, by setting the cross section of flat wire as trapezoidal, make the arrangement mode of flat wire in the stator slot more flexible and various, can adapt to different shape stator slot, and promote the slot full rate, reduce the skin effect influence.

Description

Technical Field

[0001] This utility model relates to the technical field of motor stators, and more particularly to a motor stator. Background Technology

[0002] The stator of the motor consists of a stator core and flat wires. The stator core has multiple stator slots, and the flat wires, using rectangular cross-section conductors, can be tightly stacked (like hairpins) within the stator slots, significantly improving the slot fill factor. This allows for the embedding of more copper conductors within the same volume, greatly increasing the motor's power density and torque density. Furthermore, the large contact area between the flat wires and the optimized heat conduction path effectively reduce the internal thermal resistance of the windings.

[0003] However, existing flat wires are usually rectangular cross-section conductors. When the stator slots are stepped or other irregularly shaped, this increases the difficulty of arranging the flat wires in the stator slots and reduces the slot fill factor.

[0004] Therefore, it is necessary to design a motor stator that can improve slot fill factor and allow for more flexible arrangement. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a motor stator that can improve slot fill factor and provide more flexible arrangement.

[0006] The present invention provides a motor stator, comprising a stator core and flat wires. The stator core has multiple stator slots, and the flat wires are stacked in the stator slots. The cross-section of the flat wires is trapezoidal. Each layer in the stator slot includes two combined flat wires, and the flat wires in the stator slots have the same shape and size.

[0007] Furthermore, the flat line includes two right angles, one obtuse angle, and one acute angle, with the obtuse angle adjacent to the acute angle.

[0008] Furthermore, the obtuse angle of one of the flat lines in the same layer is joined to the acute angle of another flat line, and the acute angle of one flat line is joined to the obtuse angle of another flat line.

[0009] Furthermore, the obtuse angle of one of the flat lines in the same layer is joined with the obtuse angle of another flat line, and the right angle of one flat line is joined with the right angle of another flat line.

[0010] Furthermore, the acute angle of one of the flat lines in the same layer aligns with the acute angle of another flat line, and the right angle of one flat line aligns with the right angle of another flat line.

[0011] Furthermore, the upper base of the cross-section of the flat wire is a, the lower base is b, and the straight side between the upper and lower bases is h, where a + b = 2h.

[0012] Furthermore, the upper base of the cross-section of the flat line is a, the lower base is b, the straight side between the upper and lower bases is h, and a+b>2h.

[0013] Furthermore, the stator slot is a rectangular slot, and the two flat lines on the same layer are joined together to form a rectangle.

[0014] Furthermore, the stator slot is an irregularly shaped slot, and an external oil cooling channel is provided at the bottom of the stator slot.

[0015] Furthermore, an oil cooling channel is provided between the flat wires in the stator slot, or between the flat wires and the stator slot.

[0016] The above technical solution has the following beneficial effects:

[0017] In this invention, by setting the cross-section of the flat wire to a trapezoidal shape, the arrangement of the flat wire in the stator slot is more flexible and diverse, which can adapt to stator slots of different shapes, improve the slot fill factor, and reduce the skin effect. Attached Figure Description

[0018] The disclosure of this utility model will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0019] Figure 1 This is a perspective view of the motor stator in this utility model;

[0020] Figure 2 This is a schematic diagram of the cross-section of the flat wire in one embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the flat wires combined in one embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of flat wires stacked in the stator slot in one embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the stator slot in another embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of flat wires stacked in the stator slot in another embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the stator slot in another embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of flat wires stacked in the stator slot in another embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of flat wires stacked in the stator slot in another embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the flat wires stacked in the stator slot in the first optional embodiment of this utility model;

[0029] Figure 11 This is a schematic diagram of the flat wires stacked in the stator slot in the second optional embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of the flat wires stacked in the stator slot in the third optional embodiment of this utility model;

[0031] Figure 13 This is a schematic diagram of the flat wires stacked in the stator slot in the fourth optional embodiment of this utility model;

[0032] Figure 14 This is a schematic diagram of the flat wires stacked in the stator slot in the fifth optional embodiment of this utility model;

[0033] Figure 15 This is a schematic diagram of the flat wires stacked in the stator slot in the sixth optional embodiment of this utility model;

[0034] Figure 16 This is a schematic diagram of the flat wires stacked in the stator slot in the seventh optional embodiment of this utility model.

[0035] Appendix Label Reference Table:

[0036] Flat line 1: Right angle 11, obtuse angle 12, acute angle 13;

[0037] Stator core 2: stator slot 21, external oil cooling channel 22, internal oil cooling channel 23, conical slot opening 211. Detailed Implementation

[0038] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0039] It is readily understood that, based on the technical solution of this utility model, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0040] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0041] In some embodiments of this utility model, such as Figures 1-3 As shown, the motor stator includes a stator core 2 and flat wires 1. The stator core 2 has multiple stator slots 21. The flat wires 1 are stacked in the stator slots 21. The cross-section of the flat wires 1 is trapezoidal. The same layer in the stator slots 21 includes two combined flat wires 1. The flat wires 1 in the stator slots 21 have the same shape and size.

[0042] Specifically, such as Figure 1 As shown, the stator core 2 is cylindrical, and multiple stator slots 21 are spaced apart along the circumference on the stator core 2. Multiple flat wires 1 are stacked in each stator slot 21.

[0043] like Figure 2 As shown, the cross-section of flat line 1 is trapezoidal.

[0044] like Figure 3 As shown, all flat wires 1 have the same model number, that is, the same shape and size, which helps to save costs and increases the versatility of flat wires 1.

[0045] The flat wires 1 in the stator slot 21 are arranged in multiple layers, with each layer consisting of two flat wires 1. Because the cross-section of the flat wires 1 is trapezoidal, their arrangement in the stator slot 21 is more flexible and diverse, adapting to stator slots 21 of different shapes, improving slot fill factor, and reducing the skin effect. The skin effect refers to the eddy electric field generated within a conductor by a changing magnetic field produced by a high-frequency current, hindering the current from penetrating deep into the conductor and causing the current to concentrate on the surface; the high magnetic field strength at the slot opening exacerbates the skin effect. Traditionally, flat wires with rectangular cross-sections have only one flat wire per layer in the stator slot. In this embodiment, each layer is formed by a combination of two flat wires 1; this segmented combination of flat wires helps reduce the skin effect.

[0046] Furthermore, such as Figure 2 As shown, the flat line 1 includes two right angles 11, an obtuse angle 12, and an acute angle 13, with the obtuse angle 12 and the acute angle 13 being adjacent.

[0047] In this embodiment, the flat line 1 is a right trapezoid, which includes three straight sides and one hypotenuse. The three straight sides form two right angles 11, one straight side forms an obtuse angle 12 with one end of the hypotenuse, and the other straight side forms an acute angle 13 with the other end of the hypotenuse. Multiple flat lines 1 with right trapezoidal cross-sections can be combined to form flat line combinations of different shapes.

[0048] like Figure 3 As shown, two right-angled trapezoids can form a standard rectangle, a rectangle with a concave top, or a rectangle with a convex bottom. By combining flat wires of different shapes, it is possible to adapt to stator slots 21 with different structures, especially irregularly shaped stator slots 21, thereby improving the slot fill factor. However, traditional rectangular cross-section flat wires cannot fill irregular areas when facing irregularly shaped stator slots, resulting in a reduced slot fill factor. Furthermore, it may be necessary to use rectangular flat wires of different sizes for the stator slots, increasing the cost of the flat wires.

[0049] In one embodiment of this utility model, such as Figure 4 As shown, the obtuse angle 12 of one flat line 1 on the same layer is joined to the acute angle 13 of another flat line 1, and the acute angle 13 of one flat line 1 is joined to the obtuse angle 12 of another flat line 1.

[0050] Figure 4 The stator slot 21 is a rectangular slot. Two flat lines 1 on the same layer combine to form a standard rectangle. The flat lines 1 are arranged in five layers in the stator slot 21, four of which are standard rectangles. The bottom of the stator slot 21 is a conical slot opening 211, so the flat lines 1 on the bottom layer form a shape with a raised center at the bottom, which improves the slot fill factor of the stator slot 21. Among them, the two flat lines 1 on the bottom layer are joined at acute angles.

[0051] Better, such as Figure 2 As shown, the upper base of the cross-section of flat line 1 is a, the lower base is b, and the straight side between the upper and lower bases is h. Figure 4 The flat wire 1 needs to satisfy a+b=2h. After combination, the width of each layer of flat wire 1 is the same, and the rectangular stator slot is compatible with existing silicon steel sheet molds.

[0052] In another embodiment of this utility model, such as Figure 5 As shown, stator slot 21 is a trapezoidal slot.

[0053] like Figure 6 As shown, flat line 1 is a+b>2h. The trapezoidal stator slot 21 has a wider upper section and a narrower lower section. The wider upper section has five layers of flat lines 1, with two flat lines 1 in each layer forming a standard rectangle. The narrower lower section has two flat lines 1 joined at acute angles, forming a downward convex shape in the middle, which matches the conical slot opening 211 of the stator slot 21.

[0054] In another embodiment of this utility model, such as Figure 7 As shown, the bottom of the stator slot 21 is an irregularly shaped slot bottom, and an external oil cooling channel 22 is provided outside the bottom. The external oil cooling channel 22 is a circular oil channel formed outside the bottom of the stator slot 21.

[0055] like Figure 8 As shown, to match the shape of the bottom of the stator slot 21, the two flat lines 1 are joined at obtuse and right angles respectively, forming a recessed structure in the upper center, which is used to match the recessed structure at the bottom of the stator slot 21. The recessed bottom of the stator slot 21 is provided with an external oil cooling channel 22 for the flow of cooling oil.

[0056] Furthermore, such as Figure 8 As shown, the two flat lines 1 of the second layer of the stator slot 21 are joined at acute and right angles respectively; the two flat lines 1 of the third layer are joined at obtuse and right angles respectively; the two flat lines 1 of the fourth layer are joined at acute and right angles respectively; the two flat lines 1 of the fifth layer are joined at obtuse and right angles respectively; and the two flat lines 1 of the sixth layer are joined at acute and right angles respectively, forming a shape that bulges downward in the middle.

[0057] Optionally, Figure 8 The flat lines 1 from the second to the fifth layer can also form a standard rectangle.

[0058] In another embodiment of this utility model, such as Figure 9 As shown, an oil cooling channel 23 is provided between the flat wire 1 inside the stator slot 21 and the stator slot 21. Specifically, an oil cooling channel 23 is formed between the bottom of the stator slot 21 and the flat wire 1 of the first layer. The two flat wires 1 of the first layer are joined at an obtuse angle, and a recess is formed in the upper middle part, which forms a space between them and the bottom of the stator slot 21.

[0059] Optionally, such as Figure 10 As shown, the oil cooling channel 22 outside the bottom of the irregular stator slot 21 can also be rhomboid.

[0060] Optionally, such as Figure 11 As shown, the flat line 1 of the fifth layer of the stator slot 21 forms an oil cooling channel 23 between the stator slot 21 and the stator slot 21. The obtuse angle and right angle between the two flat lines 1 of the fifth layer are respectively connected, and a depression is formed in the lower middle part, which forms a space with the stator slot 21.

[0061] Optionally, such as Figure 12 As shown, an oil cooling channel 23 is formed between the flat wire 1 of the first layer and the flat wire 1 of the second layer, an oil cooling channel 23 is formed between the flat wire 1 of the third layer and the flat wire 1 of the fourth layer, and an oil cooling channel 23 is formed between the flat wire 1 of the fifth layer and the flat wire 1 of the sixth layer.

[0062] Optionally, such as Figure 13 As shown, the flat lines 1 in the same layer can also be connected at two right angles respectively. Each flat line 1 forms an oil cooling channel 23 in the slot with the side of the stator slot 21. The outer sides of the two flat lines 1 in the same layer are parallel to each other.

[0063] Optionally, such as Figure 14 As shown, the flat lines 1 in the same layer can also be connected at two right angles respectively. Each flat line 1 forms an oil cooling channel 23 in the slot with the side of the stator slot 21. The outer sides of the two flat lines 1 in the same layer are arranged symmetrically.

[0064] Optionally, such as Figure 15 As shown, the flat lines 1 in the same layer only have acute-angle connections, forming in-slot oil cooling channels 23. Specifically, the in-slot oil cooling channels 23 of the first and second layers are combined to form a rhombus-shaped oil cooling channel. The in-slot oil cooling channels 23 of the third and fourth layers are combined to form a rhombus-shaped oil cooling channel. The in-slot oil cooling channels 23 of the fifth and sixth layers are combined to form a rhombus-shaped oil cooling channel.

[0065] Optionally, such as Figure 16 As shown, the two flat lines 1 of each layer are joined at obtuse and right angles respectively. The flat line 1 of the first layer forms an in-slot oil cooling channel 23 between itself and the bottom of the stator slot 21. The remaining adjacent layers form in-slot oil cooling channels 23.

[0066] In this invention, by setting the cross-section of the flat wire to a trapezoidal shape, the arrangement of the flat wire in the stator slot is more flexible and diverse, which can adapt to stator slots of different shapes, improve the slot fill factor, and reduce the skin effect.

[0067] The above description is merely the principle and preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of this utility model, and these modifications should also be considered within the protection scope of this utility model.

Claims

1. A motor stator, comprising a stator core and flat wires, wherein the stator core has a plurality of stator slots, and the flat wires are stacked in layers within the stator slots, characterized in that, The flat wire has a trapezoidal cross-section, and the same layer in the stator slot includes two combined flat wires. The flat wires in the stator slot have the same shape and size.

2. The motor stator according to claim 1, characterized in that, The flat line includes two right angles, one obtuse angle, and one acute angle, with the obtuse angle adjacent to the acute angle.

3. The motor stator according to claim 2, characterized in that, The obtuse angle of one of the flat lines on the same layer meets the acute angle of another flat line, and the acute angle of one flat line meets the obtuse angle of another flat line.

4. The motor stator according to claim 2, characterized in that, The obtuse angle of one of the flat lines on the same layer is joined with the obtuse angle of another flat line, and the right angle of one flat line is joined with the right angle of another flat line.

5. The motor stator according to claim 2, characterized in that, The acute angle of one of the flat lines on the same layer aligns with the acute angle of another flat line, and the right angle of one flat line aligns with the right angle of another flat line.

6. The motor stator according to claim 2, characterized in that, The cross-section of the flat wire has an upper base of a, a lower base of b, and a straight side between the upper and lower bases, where a + b = 2h.

7. The motor stator according to claim 2, characterized in that, The cross-section of the flat wire has an upper base of a, a lower base of b, and a straight edge between the upper and lower bases of h, where a + b > 2h.

8. The motor stator according to claim 2, characterized in that, The stator slot is a rectangular slot, and the two flat lines on the same layer are joined together to form a rectangle.

9. The motor stator according to claim 2, characterized in that, The stator slot is an irregularly shaped slot, and an external oil cooling channel is provided at the bottom of the stator slot.

10. The motor stator according to claim 2, characterized in that, Oil cooling channels are provided between the flat wires in the stator slot or between the flat wires and the stator slot.

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