High-speed flat wire motor stator and high-speed flat wire motor

Abstract

The utility model discloses a high-speed flat wire motor stator and a high-speed flat wire motor. The stator comprises a stator core and a flat wire winding. The stator core comprises a stator slot, the stator slot comprises an outer threading part and an inner threading part, and a plurality of wire layers are arranged in the stator slot along the radial direction of the stator core; the flat wire winding comprises a first flat wire and a second flat wire, a cross wire layer of the first flat wire is arranged in the outer threading parts of the two different stator slots in a penetrating manner, a cross wire layer of the second flat wire is arranged in the inner threading parts of the two different stator slots in a penetrating manner, and the cross sectional area of the first flat wire is larger than or equal to two times of the cross sectional area of the second flat wire; and the number of the second flat wires is twice that of the first flat wires. According to the scheme, the effective copper sectional area in the stator slot is ensured, the alternating current loss of the second flat wire close to the rotor is reduced, the heat dissipation of the motor is facilitated, and circulating current is avoided.

Description

Technical Field

[0001] This utility model relates to the field of electric motors, and in particular to a high-speed flat wire motor stator and a high-speed flat wire motor. Background Technology

[0002] Motor windings are typically divided into two types: flat wire and round wire. Round wire windings generally have a pure copper slot fill factor of 40%-45%, while flat wire windings can reach 65%-70%. Therefore, flat wire windings can fill the same space with more copper wire, allowing them to carry larger currents, generate higher armature magnetomotive force, and thus improve the motor's torque density and power output. They also offer better heat dissipation and voltage withstand capability. However, as motor speed increases, due to the skin effect and proximity effect, the AC losses of flat wire windings continuously increase. Especially the flat wire windings near the rotor, affected by the rotating rotor's magnetic field, generate most of the AC losses, leading to reduced motor efficiency at high speeds. Simultaneously, the winding temperature rises rapidly, affecting the motor's operating range.

[0003] To reduce AC losses in high-speed regions, existing solutions include increasing the number of flat wires in each stator slot (i.e., increasing the number of wire layers in the stator slot) and increasing the number of parallel branches in the motor. For example, the utility model patent with authorization number CN216216163U adjusts a motor with one or two parallel branches to a stator with three parallel flat wire windings. Another example is a scheme with four wire layers and two parallel branches, where the radial thickness of each flat wire is reduced to half and adjusted to an eight-wire layer, four-branch parallel scheme, achieving the goal of reducing AC losses and providing wider application. However, each flat wire in the stator slot requires an insulation layer, and gaps must be maintained between adjacent wire layers. Therefore, simply increasing the number of wire layers leads to a reduction in effective copper area, increasing DC losses and reducing motor efficiency. Furthermore, thinner flat wires and an increased number of layers result in smaller gaps between conductors, increasing voltage and resistance differences between winding branches, leading to more pronounced circulating currents and causing localized overheating of the motor. Utility Model Content

[0004] Therefore, in order to solve the above problems, this utility model provides a high-speed flat wire motor stator and a high-speed flat wire motor.

[0005] The utility model is realized through the following technical solutions:

[0006] A high-speed flat wire motor stator includes a stator core and flat wire windings;

[0007] The stator core has multiple stator slots of the same shape arranged at equal angular intervals along its inner circumference. Two different stator slots form stator teeth. The stator slot includes an outer wire-passing part and an inner wire-passing part. Multiple wire layers are arranged in the stator slot along the radial direction of the stator core. At least two wire layers are distributed in both the outer wire-passing part and the inner wire-passing part.

[0008] The flat wire winding includes a plurality of first flat wires and second flat wires arranged in the stator slots. The first flat wires are laid in the outer wire passing parts of two different stator slots, and the second flat wires are laid in the inner wire passing parts of two different stator slots. The cross-sectional area of ​​the first flat wires is greater than or equal to twice the cross-sectional area of ​​the second flat wires, and the number of second flat wires is twice that of the first flat wires.

[0009] Preferably, the width of the outer thread portion is greater than the width of the inner thread portion, and a transition surface is formed between the outer thread portion and the inner thread portion.

[0010] Preferably, the thickness of the first flat wire is twice the thickness of the second flat wire, and the width of the first flat wire is greater than the width of the second flat wire.

[0011] Preferably, the difference in width between the first flat wire and the second flat wire is equal to the difference in width between the outer thread portion and the inner thread portion.

[0012] Preferably, the first flat wire is a hairpin-type flat wire, including two parallel first plug-in portions and a first connecting end connecting the two first plug-in portions. The two first plug-in portions are disposed across wire layers in the outer wire passing portions of two different stator slots, and the difference in the number of wire layers of the two first plug-in portions of the same first flat wire is 1.

[0013] Preferably, the second flat wire is a hairpin-type flat wire, including two parallel second plug-in portions and a second connecting end connecting the two second plug-in portions. The two second plug-in portions are arranged across wire layers in the inner wire passing portions of two different stator slots, and the difference in the number of wire layers of the two second plug-in portions of the same second flat wire is 1.

[0014] Preferably, the number of stator slots between the two first plug-in portions of the first flat wire is the same as the number of stator slots between the two second plug-in portions of the second flat wire.

[0015] Preferably, the outer threaded section has two thread layers, and the inner threaded section has four thread layers.

[0016] Preferably, a gap is provided between two adjacent wire layers in the stator slot, and an insulating layer is provided on the outer periphery of each first and second insertion part.

[0017] High-speed flat wire motor, including the high-speed flat wire motor stator as described above.

[0018] The beneficial effects of this utility model's technical solution are mainly reflected in:

[0019] 1. Each stator slot is provided with an outer wire threading section and an inner wire threading section, and the outer wire threading section and the inner wire threading section are provided with at least two layers of wire. The cross-sectional area of ​​the first flat wire in the outer wire threading section is greater than or equal to twice the cross-sectional area of ​​the second flat wire in the inner wire threading section, and the number of second flat wires is twice that of the first flat wire. This reduces the AC loss of the second flat wire near the rotor and is also beneficial to the heat dissipation of the motor. The cross-sectional area of ​​the first flat wire in the outer wire threading section is larger and the number of wire layers is smaller, which minimizes the consumption of the effective copper cross-sectional area in the stator slot by the gap between wire layers and the area of ​​the insulation layer.

[0020] 2. In a preferred embodiment, the width of the outer wire passage portion of the stator slot is greater than the width of the inner wire passage portion, and the width of the first flat wire is also greater than the width of the second flat wire. By widening the width of the outer wire passage portion and the width of the first flat wire, the effective copper cross-sectional area in the stator slot can be guaranteed without extending the radial slot depth of the stator slot, thereby reducing AC losses and improving the continuous performance of the motor.

[0021] 3. Both the first flat wire and the second flat wire are passed through two different stator slots across the wire layer, and the first flat wire and the second flat wire are preferably hairpin flat wires, so as to realize the parallel transposition design of the flat wire winding and avoid the occurrence of circulating current. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the flat wire winding in Embodiment 1 of this utility model;

[0023] Figure 2 This is a schematic diagram of the flat wire winding in Embodiment 2 of this utility model;

[0024] Figure 3 This is a schematic diagram of the parallel connection of each branch of the flat wire winding in Embodiment 1 and Embodiment 2;

[0025] Figure 4 This is a cross-sectional view of the stator of the high-speed flat wire motor according to Embodiment 1 of this utility model. Detailed Implementation

[0026] To make the objectives, advantages, and features of this utility model clearer and more detailed, the following non-limiting description of preferred embodiments will be illustrated and explained. These embodiments are merely typical examples of applying the technical solutions of this utility model; any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this utility model.

[0027] It should also be stated that, in the description of the solution, the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" in this solution are used for descriptive purposes only and should not be construed as indicating or implying a ranking of importance, or implicitly specifying the number of technical features shown. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0029] This utility model discloses a high-speed flat wire motor stator, including a stator core and flat wire windings;

[0030] The stator core has multiple identical stator slots 1 spaced at equal angles along its inner circumference. Two different stator slots 1 form stator teeth 2, such as... Figure 1 As shown, in one embodiment, the stator tooth 2 is a T-shaped tooth, including limiting blocks 201 disposed on both sides of its inner end, the limiting blocks 201 extending toward the opening of the stator groove 1 on its side.

[0031] like Figure 2 As shown, the stator slot 1 includes an outer wire threading section 101 and an inner wire threading section 102, and multiple wire layers are arranged in the stator slot 1 along the radial direction of the stator core. At least two wire layers are distributed in both the outer wire threading section 101 and the inner wire threading section 102. A gap 6 is provided between adjacent wire layers in the stator slot 1.

[0032] The flat wire winding includes a plurality of first flat wires 3 and second flat wires 4 arranged in the stator slot 1. The first flat wires 3 are passed through the outer wire passing part 101 of two different stator slots 1 in a cross-wire layer. The second flat wires 4 are passed through the inner wire passing part 102 of two different stator slots 1 in a cross-wire layer. The cross-sectional area of ​​the first flat wires 3 is greater than or equal to twice the cross-sectional area of ​​the second flat wires 4, and the number of second flat wires 4 is twice that of the first flat wires 3.

[0033] Each of the first and second plug-in portions is provided with an insulating layer 5 on its outer periphery. In one embodiment, the insulating layer 5 is insulating paper wrapped around the outer periphery of the first and second plug-in portions.

[0034] In some embodiments, the number of stator slots 1 between the two first insertion portions of the first flat wire 3 is the same as the number of stator slots 1 between the two second insertion portions of the second flat wire 4, so as to simplify the winding structure and winding steps.

[0035] like Figure 1 As shown, this is Embodiment 1 of the present invention. In this embodiment, the widths of the outer wire threading portion 101 and the inner wire threading portion 102 are the same. The outer wire threading portion 101 contains two layers of wire, and the inner wire threading portion 102 contains four layers of wire. The flat wire winding includes two layers of first flat wire 3 (e0, f0 and e, f) and four layers of second flat wire 4 (a0, b0, c0, d0 and a, b, c, d), as shown. Figure 1 As shown, a0 and a are two insertion ends of the same second flat wire 4, b0 and b are two insertion ends of the same second flat wire 4, c0 and c are two insertion ends of the same second flat wire 4, and d0 and d are two insertion ends of the same second flat wire 4. The first flat wire 3 is threaded through the outer threading portion 101, and the two insertion ends of the same second flat wire 4 are located in different wire layers of different positioning slots. e0 and e are two insertion ends of the same first flat wire 3, and f0 and f are two insertion ends of the same first flat wire 3. The second flat wire 4 is threaded through the inner threading portion 102, and the two insertion ends of the same first flat wire 3 are located in different wire layers of different positioning slots. Figure 3 As shown, the first flat wire 3 and the second flat wire 4 located in the two stator slots 1 together form 6 parallel branches; the thickness of the first flat wire 3 is twice the thickness of the second flat wire 4, and the width of the first flat wire 3 is equal to the width of the second flat wire 4.

[0036] like Figure 2 As shown, this is Embodiment 2 of the present invention. In this embodiment, the width of the outer wire-passing portion 101 is greater than the width of the inner wire-passing portion 102, and a transition surface 103 is formed between the outer wire-passing portion 101 and the inner wire-passing portion 102. The outer wire-passing portion 101 contains two wire layers, and the inner wire-passing portion 102 contains four wire layers. The flat wire winding includes two layers of first flat wires 3 (e0, f0 and e, f) and four layers of second flat wires 4 (a0, b0, c0, d0 and a, b, c, d), as shown. Figure 1As shown, a0 and a are two insertion ends of the same second flat wire 4, b0 and b are two insertion ends of the same second flat wire 4, c0 and c are two insertion ends of the same second flat wire 4, and d0 and d are two insertion ends of the same second flat wire 4. The first flat wire 3 is threaded through the outer threading portion 101, and the two insertion ends of the same second flat wire 4 are located in different wire layers of different positioning slots. e0 and e are two insertion ends of the same first flat wire 3, and f0 and f are two insertion ends of the same first flat wire 3. The second flat wire 4 is threaded through the inner threading portion 102, and the two insertion ends of the same first flat wire 3 are located in different wire layers of different positioning slots. Figure 3 As shown, the first flat wire 3 and the second flat wire 4 located in the two stator slots 1 together form 6 parallel branches; in order to ensure the effective copper cross-sectional area in the stator slots 1, the thickness of the first flat wire 3 is twice the thickness of the second flat wire 4, and the width of the first flat wire 3 is greater than the width of the second flat wire 4. At this time, the difference in width between the first flat wire 3 and the second flat wire 4 is equal to the difference in width between the outer wire passing part 101 and the inner wire passing part 102.

[0037] In some embodiments, the first flat wire 3 is a hairpin-type flat wire, including two parallel first plug-in portions and a first connecting end connecting the two first plug-in portions. The first connecting end and the two first plug-in portions are preferably integrally formed. The first connecting end and the two first plug-in portions can also be connected by welding or other means. The two first plug-in portions are arranged in the outer wire passing portion 101 of two different stator slots 1, and the difference in the number of wire layers between the two first plug-in portions of the same first flat wire 3 is 1. In one embodiment, the second flat wire 4 is also a hairpin-type flat wire, including two parallel second plug-in portions and a second connecting end connecting the two second plug-in portions. The second connecting end and the two second plug-in portions are preferably integrally formed. The second connecting end and the two second plug-in portions can also be connected by welding or other means. The two second plug-in portions are arranged in the inner wire passing portion 102 of two different stator slots 1, and the difference in the number of wire layers between the two second plug-in portions of the same second flat wire 4 is 1.

[0038] This utility model also discloses a high-speed flat wire motor, including the high-speed flat wire motor stator as described above.

[0039] This utility model has many other embodiments. All technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A high-speed flat wire motor stator, characterized in that: Including stator core and flat wire winding; The stator core has multiple stator slots of the same shape arranged at equal angular intervals along its inner circumference. Two different stator slots form stator teeth. The stator slot includes an outer wire-passing part and an inner wire-passing part. Multiple wire layers are arranged in the stator slot along the radial direction of the stator core. At least two wire layers are distributed in both the outer wire-passing part and the inner wire-passing part. The flat wire winding includes a plurality of first flat wires and second flat wires arranged in the stator slots. The first flat wires are laid in the outer wire passing parts of two different stator slots, and the second flat wires are laid in the inner wire passing parts of two different stator slots. The cross-sectional area of ​​the first flat wires is greater than or equal to twice the cross-sectional area of ​​the second flat wires, and the number of second flat wires is twice that of the first flat wires.

2. The high-speed flat wire motor stator according to claim 1, characterized in that: The width of the outer thread portion is greater than the width of the inner thread portion, and a transition surface is formed between the outer thread portion and the inner thread portion.

3. The high-speed flat wire motor stator according to claim 2, characterized in that: The thickness of the first flat wire is twice the thickness of the second flat wire, and the width of the first flat wire is greater than the width of the second flat wire.

4. The high-speed flat wire motor stator according to claim 3, characterized in that: The difference in width between the first flat wire and the second flat wire is equal to the difference in width between the outer thread portion and the inner thread portion.

5. The high-speed flat wire motor stator according to claim 1, characterized in that: The first flat wire is a hairpin-type flat wire, including two parallel first plug-in parts and a first connecting end connecting the two first plug-in parts. The two first plug-in parts are arranged across wire layers in the outer wire passing parts of two different stator slots, and the difference in the number of wire layers of the two first plug-in parts of the same first flat wire is 1.

6. The high-speed flat wire motor stator according to claim 5, characterized in that: The second flat wire is a hairpin-type flat wire, including two parallel second plug-in parts and a second connecting end connecting the two second plug-in parts. The two second plug-in parts are arranged across the wire layers in the inner wire passing parts of two different stator slots, and the difference in the number of wire layers of the two second plug-in parts of the same second flat wire is 1.

7. The high-speed flat wire motor stator according to claim 2, characterized in that: The outer threaded section has two layers of thread, and the inner threaded section has four layers of thread.

8. The high-speed flat wire motor stator according to claim 6, characterized in that: The number of stator slots between the two first plug-in portions of the first flat wire is the same as the number of stator slots between the two second plug-in portions of the second flat wire.

9. The high-speed flat wire motor stator according to claim 6, characterized in that: A gap is provided between adjacent wire layers in the stator slot, and an insulating layer is provided on the outer periphery of each first and second insertion part.

10. A high-speed flat wire motor, characterized in that: Includes the high-speed flat wire motor stator as described in any one of claims 1-8.

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