Three-phase flat wire motor stator and flat wire motor

Abstract

The utility model discloses a three-phase flat wire motor stator, which comprises a stator iron core which is integrally in a circular ring shape and comprises a plurality of T-shaped teeth arranged along the inner circumference of the stator iron core, a stator groove is formed between every two adjacent T-shaped teeth, and the width of the stator grooves is gradually increased from inside to outside; the winding comprises a plurality of flat wire conductors which have the same shape and are respectively arranged in the stator slots in a penetrating manner; and the insulating parts are arranged in the stator grooves and are positioned between the inner walls of the stator grooves and the flat wire conductors. According to the scheme, on the premise that the size of the stator is not increased, the copper entering amount and the slot filling rate of the stator can be improved, meanwhile, the winding welding and threading difficulty is lowered, and errors are not likely to occur in the winding and welding process.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a three-phase flat wire motor stator and a flat wire motor. Background Art

[0002] The motor stator of a traditional electric vehicle adopts an enameled round copper wire structure. However, the wire diameter of the enameled round copper wire is usually large, and there are gaps between the enameled round copper wires. Therefore, in order to accommodate the enameled round copper wire structure, the volume of the stator structure needs to be further increased. In the prior art, replacing traditional enameled wire with flat copper bars can increase power and reduce the volume of the stator structure. For example, the utility model patent with authorization announcement number CN217307376U provides a single-channel flat wire hairpin stator winding structure, including a stator core, multiple wire slots, and a hairpin flat wire winding. Each wire slot is provided with multiple wire layers. The hairpin flat wire winding includes U-phase, W-phase and V-phase flat wire windings. The three-phase flat wire windings all include multiple single-layer flat copper wires and multiple cross-layer flat copper wires. All wire layers are arranged in ascending order away from the center of the stator core, namely the first wire layer to the eighth wire layer. The first wire layer is embedded with multiple single-layer flat copper wires, and the second to eighth wire layers are embedded with multiple cross-layer flat copper wires. The flat copper wires are all connected together by welding. By arranging multiple layers of flat wires in one stator slot, the slot fill rate can be improved and the lead wires are concentrated. However, since the flat copper wires are welded together, there are numerous solder joints, which complicates the process, reduces efficiency, and increases the likelihood of welding errors. Furthermore, the windings utilize a variety of flat wires with varying shapes, making the manufacturing process complex. Utility Model Content

[0003] Therefore, in order to solve the above problems, the utility model provides a three-phase flat wire motor stator and a flat wire motor.

[0004] The utility model is realized through the following technical solutions:

[0005] A three-phase flat wire motor stator, comprising:

[0006] The stator core is in the shape of a circular ring and includes a plurality of T-shaped teeth arranged along its inner circumference. Stator slots are formed between two adjacent T-shaped teeth, and the width of the stator slots gradually increases from the inside to the outside;

[0007] The winding comprises a plurality of flat wire conductors of identical shape, each of which is inserted into the stator slots. The number of the flat wire conductors is the same as the number of the stator slots. Each of the flat wire conductors comprises two parallel first and second plug-in wires. The first plug-in wire is disposed on the inner side of one of the stator slots, and the first plug-in wires of the plurality of flat wire conductors collectively form an inner winding. The second plug-in wire is disposed on the outer side of another stator slot, and the second plug-in wires of the plurality of flat wire conductors collectively form an outer winding. Both ends of the first and second plug-in wires in each flat wire conductor extend outside the stator slot, and one end of the first and second plug-in wires is twisted together to form a twisted end, and the other end is bent outward to form two connection ends.

[0008] An insulating member is disposed in each of the stator slots and is located between an inner wall of the stator slot and the flat wire conductor.

[0009] Preferably, the flat wire conductors are formed by twisting a plurality of excitation wires and then punching them into one piece.

[0010] Preferably, the cross-sections of the first patch cord and the second patch cord are both trapezoidal, and the width of the long side of the cross-section of the first patch cord is less than or equal to the width of the short side of the cross-section of the second patch cord.

[0011] Preferably, the insulating member is insulating paper provided along the inner wall of the stator slot, and the axial length of the insulating paper is greater than the height of the stator slot, so that both ends of the insulating paper are exposed outside the two ends of the stator slot.

[0012] Preferably, the number of the stator slots, stator teeth, insulating parts and flat wire conductors is 54.

[0013] Preferably, the stator core is formed by stamping multiple layers of laminations of the same shape into one piece, and the laminations include a plurality of T-shaped teeth arranged along their inner circumference, each T-shaped tooth extends in the axial direction of the lamination, and a slot portion that is wide outside and narrow inside is formed between two adjacent T-shaped teeth.

[0014] Preferably, a plurality of through holes are provided on each of the laminations at equal angles along the circumferential direction, the through holes on the plurality of laminations correspond to each other one by one, and a plurality of cooling oil channels penetrating along the axial direction are formed in the stator core.

[0015] A flat wire motor comprises any one of the above three-phase flat wire motor stators.

[0016] The beneficial effects of the technical solution of this utility model are mainly reflected in:

[0017] 1. The same number of hairpin-type flat wires as the number of stator slots is used, and all hairpin-type flat wires have the same shape. The first plug-in wires and the second plug-in wires of several hairpin-type flat wires jointly form inner and outer windings in the stator slots, eliminating the need to use several flat wires with different shapes. One end of the first plug-in wire and the second plug-in wire of the hairpin-type flat wire are twisted together, reducing the number of welding points. This not only improves the uniformity of the flat wire shape processing, but also reduces the difficulty of welding and threading, making it less likely to make mistakes during winding and welding.

[0018] 2. In a preferred embodiment, the flat wire conductor is formed by twisting a plurality of excitation wires and then stamping them into one piece, and the cross-sections of the first plug-in wire and the second plug-in wire of the flat wire conductor are both trapezoidal, and the long side width of the cross-section of the first plug-in wire is less than or equal to the short side width of the cross-section of the second plug-in wire, so that the first plug-in wire and the second plug-in wire fit the trapezoidal shape of the stator slot. Therefore, only two layers of windings, the first plug-in wire and the second plug-in wire, need to be inserted into the stator slot to ensure extremely high copper input and slot fill rate, without increasing the size of the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the stator of a three-phase flat wire motor;

[0020] Figure 2 This is a top view of the stator of a three-phase flat wire motor;

[0021] Figure 3 This is a schematic diagram of the assembly status of two flat wire conductors and the stator core;

[0022] Figure 4 yes Figure 3 A top view of

[0023] Figure 5 is a partial cross-sectional view of a first patch cord and a second patch cord assembled in the same stator slot;

[0024] Figure 6 It is a structural diagram of a flat wire conductor. DETAILED DESCRIPTION

[0025] To more clearly and in detail illustrate the objectives, advantages, and features of the present invention, the following non-limiting description of preferred embodiments is provided for illustration and explanation. This embodiment is merely a typical example of the application of the present invention's technical solution. Any technical solution formed by equivalent substitution or equivalent transformation falls within the scope of protection claimed by the present invention.

[0026] It is also stated that in the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] 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, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0028] The utility model discloses a three-phase flat wire motor stator, such as Figures 1-4 As shown, including:

[0029] The stator core 1 is annular in shape and includes a plurality of T-shaped teeth 101 arranged along its inner circumference. Stator slots 102 are formed between two adjacent T-shaped teeth 101. The width of the stator slots 102 gradually increases from the inside to the outside, making the cross-section of the stator slots 102 roughly trapezoidal. This ensures that the accommodation space of the stator slots 102 is increased while the overall volume of the stator remains unchanged, thereby facilitating the increase of the copper content in the stator slots 102.

[0030] In some embodiments, the stator core 1 is formed by stamping multiple layers of laminations of the same shape into one piece. The laminations are in a circular ring shape and include a plurality of T-shaped teeth arranged along their inner circumference. Each T-shaped tooth extends in the axial direction of the lamination, and a slot portion that is wide on the outside and narrow on the inside is formed between two adjacent T-shaped teeth 101. Multiple laminations are stacked axially and then stamped to form the stator core 1. Therefore, the T-shaped teeth on the multiple laminations are also stacked axially to form a plurality of T-shaped teeth 101 arranged at equal angles on the inner circumference of the stator core 1. At the same time, a stator slot 102 is formed between two adjacent T-shaped teeth 101, which penetrates the stator core 1 axially. The stamping method of the stator core 1 is a prior art and will not be described here.

[0031] In a preferred embodiment, a plurality of through holes are provided on each lamination at equal angles along the circumferential direction, the through holes on the plurality of laminations correspond to each other one by one, and a plurality of cooling oil passages 103 penetrating along the axial direction are formed in the stator core 1 .

[0032] like Figure 3-Figure 6As shown, the stator of the three-phase flat wire motor further includes a winding, which includes a plurality of flat wire conductors 2 of the same shape and each of which is inserted into the stator slot 102. The number of the flat wire conductors 2 is consistent with the number of the stator slots 102. Each of the flat wire conductors 2 includes two parallel first plug-in wires 201 and second plug-in wires 202. The first plug-in wire 201 is arranged on the inner side of one of the stator slots 102, and the first plug-in wires 201 of the plurality of flat wire conductors 2 together form an inner winding, the second plug-in wire 202 is arranged on the outer side of another stator slot 102, and the second plug-in wires 202 of the plurality of flat wire conductors 2 together form an outer winding, thereby forming a plurality of parallel first and second second plug-in wires 201 and second second plug-in wires 202 in the stator slot 102. 2 forms an inner and outer layer of windings, and both ends of the first patch cord 201 and the second patch cord 202 in each flat wire conductor 2 extend to the outside of the stator slot 102, wherein the first ends of the first patch cord 201 and the second patch cord 202 respectively extend to the outside of the first end of the stator slot 102 in which they are located, and the two are twisted together to form a twisted end 203, and the second ends of the first patch cord 201 and the second patch cord 202 are each bent outward to form two outwardly expanding terminal ends 204, wherein a gap is formed between the first patch cord 201 and the second patch cord 202 located in the same stator slot 102, thereby ensuring that the two are arranged in the stator slot 102 at intervals.

[0033] like Figure 5 、 Figure 6 As shown, in one embodiment, the flat wire conductor 2 is formed by twisting a plurality of excitation wires 4 and then stamping them into one piece, and then the stamped flat wire conductor 2 is bent, wherein the middle portion of the flat wire conductor 2 is bent to form the twisted end 203 at the bending portion of the middle portion, and a first patch cord 201 and a second patch cord 202 parallel to each other are formed at both ends of the twisted end 203, and then the ends of the first patch cord 201 and the second patch cord 202 are bent outwards respectively to form the connection terminals 204 of the first patch cord 201 and the second patch cord 202 respectively.

[0034] Among them, when processing the flat wire conductor 2, a segmented stamping method can also be used for processing. When stamping multiple twisted excitation wires 4, the positions of the first patch cord 201 and the second patch cord 202 can be determined first, and then the stamping pressure of the positions of the first patch cord 201 and the second patch cord 202 can be controlled to achieve control of the cross-sectional shape and size of the two after stamping. The method of changing the shape and size accuracy of the product by controlling the stamping pressure is a prior art and will not be described in detail here. In a preferred embodiment, the cross-sections of the first patch cord 201 and the second patch cord 202 are both trapezoidal, and the long side width of the cross-section of the first patch cord 201 is less than or equal to the short side width of the cross-section of the second patch cord 202, thereby ensuring that the first patch cord 201 and the second patch cord 202 are more adapted to the narrow inside and wide outside shape of the stator slot 102, and further improving the copper input and slot fill rate in the stator slot 102.

[0035] like Figure 3 、 Figure 5 As shown, the three-phase flat wire motor stator further includes a plurality of insulating members 3, which are respectively arranged in each of the stator slots 102 and located between the inner wall of the stator slot 102 and the flat wire conductor 2; in a preferred embodiment, the insulating member 3 is an insulating paper arranged along the inner wall of the stator slot 102, and the insulating paper is wrapped around the outside of the first plug wire 201 and the second plug wire 202 in the stator slot 102 where it is located, to prevent the first plug wire 201 and the second plug wire 202 from contacting the inner wall of the stator slot 102, and the axial length of the insulating paper is greater than the height of the stator slot 102, so that the two ends of the insulating paper are exposed outside the two ends of the stator slot 102.

[0036] In one embodiment, the number of the stator slots 102 , the number of the stator teeth, the number of the insulating elements 3 , and the number of the flat wire conductors 2 are all 54.

[0037] The utility model discloses a flat wire motor, comprising any one of the above three-phase flat wire motor stators.

[0038] There are many implementation methods for the present utility model, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present utility model.

Claims

1. Three-phase flat wire motor stator, characterized by: include: The stator core is in the shape of a circular ring and includes a plurality of T-shaped teeth arranged along its inner circumference. Stator slots are formed between two adjacent T-shaped teeth, and the width of the stator slots gradually increases from the inside to the outside; The winding comprises a plurality of flat wire conductors of identical shape, each of which is inserted into the stator slots. The number of the flat wire conductors is the same as the number of the stator slots. Each of the flat wire conductors comprises two parallel first and second plug-in wires. The first plug-in wire is disposed on the inner side of one of the stator slots, and the first plug-in wires of the plurality of flat wire conductors collectively form an inner winding. The second plug-in wire is disposed on the outer side of another stator slot, and the second plug-in wires of the plurality of flat wire conductors collectively form an outer winding. Both ends of the first and second plug-in wires in each flat wire conductor extend outside the stator slot, and one end of the first and second plug-in wires is twisted together to form a twisted end, and the other end is bent outward to form two connection ends. An insulating member is disposed in each of the stator slots and is located between an inner wall of the stator slot and the flat wire conductor.

2. The three-phase flat wire motor stator according to claim 1, characterized in that: The flat wire conductors are formed by twisting a plurality of excitation wires and then punching them into one piece.

3. The three-phase flat wire motor stator according to claim 2, characterized in that: The cross sections of the first patch cord and the second patch cord are both trapezoidal, and the width of the long side of the cross section of the first patch cord is less than or equal to the width of the short side of the cross section of the second patch cord.

4. The three-phase flat wire motor stator according to claim 1, characterized in that: The insulating member is an insulating paper arranged along the inner wall of the stator slot. The axial length of the insulating paper is greater than the height of the stator slot, so that both ends of the insulating paper are exposed outside the two ends of the stator slot.

5. The three-phase flat wire motor stator according to claim 1, characterized in that: The number of the stator slots, stator teeth, insulating parts and flat wire conductors is 54.

6. The three-phase flat wire motor stator according to claim 1, characterized in that: The stator core is formed by stamping multiple layers of laminations of the same shape into one piece. The laminations include a plurality of T-shaped teeth arranged along their inner circumferences. Each T-shaped tooth extends in the axial direction of the laminations, and a slot portion that is wide outside and narrow inside is formed between two adjacent T-shaped teeth.

7. The three-phase flat wire motor stator according to claim 6, characterized in that: A plurality of through holes are arranged at equal angles along the circumferential direction on each of the laminations, the through holes on the plurality of laminations correspond to each other one by one, and a plurality of cooling oil channels penetrating along the axial direction are formed in the stator core.

8. Flat wire motor, characterized by: It comprises the three-phase flat wire motor stator as described in any one of claims 1-7.

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