CN213782984U - Flat wire stator structure and flat wire motor - Google Patents
Flat wire stator structure and flat wire motor Download PDFInfo
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- CN213782984U CN213782984U CN202022709579.2U CN202022709579U CN213782984U CN 213782984 U CN213782984 U CN 213782984U CN 202022709579 U CN202022709579 U CN 202022709579U CN 213782984 U CN213782984 U CN 213782984U
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Abstract
The utility model relates to a flat wire stator structure and flat wire motor. The flat wire stator structure comprises a stator core and a stator winding; the stator iron core comprises a cylindrical iron core body with an inner cylindrical cavity; a plurality of stator slots extending along the axial direction of the iron core body are uniformly formed in the annular end face of the iron core body, and each stator slot is communicated with the inner cylinder cavity of the iron core body through a notch; the stator winding comprises a winding unit inserted in each stator slot; the winding unit comprises a plurality of flat wire conductors which are inserted in the stator slots side by side and at least one thin wire rod which is formed by winding a plurality of strands of thin wires in parallel, wherein the thin wire rod is arranged adjacent to the notches of the stator slots. The utility model discloses can solve among the correlation technique the skin effect is more obvious and produces great eddy current loss when the motor high speed operation problem.
Description
Technical Field
The utility model relates to the technical field of electric machines, in particular to flat wire stator structure flat wire motor.
Background
The flat wire motor adopts the flat wire conductor with larger sectional area as the stator winding, although the advantages of high efficiency and high power density are brought to the motor. However, when the motor is operated at a high speed, the skin effect of the flat wire conductor near the notch is more practical and more obvious due to the high-frequency change of the magnetic field, and the eddy current loss generated by the skin effect influences the operation performance of the motor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a flat wire stator structure and flat wire motor to the skin effect is more obvious and produces great eddy current loss's problem when the motor high speed operation in solving the correlation technique.
In a first aspect, the utility model provides a flat wire stator structure, include:
the stator iron core comprises a cylindrical iron core body with an inner cylindrical cavity; a plurality of stator slots extending along the axial direction of the iron core body are uniformly formed in the annular end face of the iron core body, and each stator slot is communicated with the inner cylinder cavity of the iron core body through a notch; and the number of the first and second groups,
a stator winding including a winding unit inserted in each of the stator slots; the winding unit comprises a plurality of flat wire conductors which are inserted in the stator slots side by side and at least one thin wire rod which is formed by winding a plurality of strands of thin wires in parallel, wherein the thin wire rod is arranged adjacent to the notches of the stator slots.
In some embodiments, each of said winding units comprises one said slim bar and a plurality of said flat wire conductors inserted side by side in said stator slots.
In some embodiments, the thin wire rod comprises a plurality of strands of the thin wire in a round shape disposed around a winding;
each flat wire conductor is set to be a flat copper wire.
In some embodiments, the hairline bar is provided as a flat shaped bar.
In some embodiments, the flat wire conductors have a gap between them and the stator slots in which the slim rods are lodged.
In some embodiments, each said slim bar is provided as a U-shaped bar;
the U-shaped bar comprises a bar bending part and two bar straight line sections which are respectively connected to two ends of the bar bending part, and the two bar straight line sections are respectively inserted into the two stator slots.
In some embodiments, the bar bend is formed by twist bending a length of linear bar.
In some embodiments, each of the flat wire conductors is provided as a U-shaped flat wire;
the U-shaped flat wire comprises a flat wire bending section part and two flat wire straight line section parts which are respectively connected to two ends of the flat wire bending section part, and the two flat wire straight line section parts are respectively inserted into the two stator slots.
In some embodiments, the ends of the slim rods and the ends of the flat wire conductors, which are disposed side-by-side in the same stator slot, are welded together.
In a second aspect, the present invention provides a flat wire motor, including the flat wire stator structure as described above.
The utility model provides a beneficial effect that technical scheme brought includes: when the motor runs at high speed, the skin effect generated by the flat wire conductor close to the notch due to the high-frequency change of the magnetic field can be reduced, the eddy current loss can be reduced, and the running performance of the motor can be ensured.
The embodiment of the utility model provides a flat wire stator structure sets up the winding unit that flat wire conductor and fine rule stick are constituteed in the stator slot through the week side setting at stator core to make the fine rule stick that is formed by stranded thin wire duplex winding be close to the notch setting of stator slot inboard. Therefore, the skin effect can be generated only in the section of the thin wire rod with smaller diameter, so that the eddy current loss can be reduced, and the running performance of the motor can be ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic perspective view of a flat wire stator structure according to an embodiment of the present invention;
fig. 2 is a schematic view of a partially enlarged structure of a flat wire stator structure according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of a thin wire rod of a flat wire stator structure according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a flat wire conductor of a flat wire stator structure according to an embodiment of the present invention;
fig. 5 is a graph comparing the eddy current loss simulation results of the stator winding using the slim rod (formed by winding a plurality of strands of fine wires) and the conventional stator winding not using the slim rod (using the flat copper wire) according to the embodiment of the present invention.
In the figure: 100. a stator core; 102. a stator slot; 104. a notch; 200. a stator winding; 210. a flat wire conductor; 212. bending the section part of the flat wire; 214. a flat wire linear section; 220. a thin wire rod; 222. a wire rod bending part; 224. a bar straight section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Because the flat-wire motor adopts the flat copper wire with larger sectional area as the stator winding, the advantages of high efficiency and high power density are brought to the motor. However, when the motor is operated at a high speed, the skin effect of the flat copper wire near the notch is more practical and obvious due to the high-frequency change of the magnetic field, and the eddy current loss generated by the skin effect influences the operation performance of the motor. In order to solve the technical problem, the utility model provides a flat wire stator structure and flat wire motor.
As shown in fig. 1 to fig. 2, the present invention provides a flat wire stator structure, which includes a stator core 100 and a stator winding 200 disposed on the stator core 100. Further, the stator core 100 includes a core body, and a plurality of stator slots 102 opened on the core body; also, the stator winding 200 includes a winding unit embedded in each stator slot 102.
Specifically, the core body of the stator core 100 is a cylindrical structure having an inner cylindrical cavity, and the inner cylindrical cavity of the core body is used for penetrating through the motor rotor. As shown in fig. 2, the plurality of stator slots 102 are uniformly opened on the annular end surface of the core body and extend along the axial direction of the core body, that is, the plurality of stator slots 102 are annularly opened on the core body, the length direction of the stator slots 102 is the axial direction of the core body, and the width direction of the stator slots 102 is the radial direction of the core body. Moreover, each stator slot 102 is communicated with the inner cylinder cavity of the iron core body through a notch 104, that is, the notch 104 communicating the stator slot 102 and the iron core body is opened at the inner side of each stator slot 102. Furthermore, the winding unit includes a plurality of flat wire conductors 210 inserted side by side in the stator slot 102 and at least one thin wire rod 220 formed by winding a plurality of strands of thin wire, and the thin wire rod 220 is disposed adjacent to the notch 104 of the stator slot 102. That is, the fine bar 220 is disposed close to the inner cylindrical cavity of the stator core 100, and the flat wire conductor 210 is disposed close to the outer ring of the stator core 100, so that the fine bar 220 is located at a position where the skin effect is easily generated in the flat wire stator structure, and the flat wire conductor 210 is located away from the position where the skin effect is easily generated.
Further, the above-described flat wire stator structure is such that a winding unit composed of a flat wire conductor 210 and a thin wire rod 220 is provided in a stator slot 102 provided on the circumferential side of the stator core 100, and the thin wire rod 220 formed by winding around a plurality of strands of thin wire is disposed close to a notch 104 inside the stator slot 102. Thus, the skin effect is generated only in the section of the thin wire rod 220 with smaller diameter, so that the eddy current loss can be reduced, and the running performance of the motor can be ensured.
Further, in some embodiments, each winding unit may include one slim bar 220 and a plurality of flat wire conductors 210 inserted side-by-side in stator slots 102. A plurality of flat wire conductors 210 and a thin wire rod 220 are arranged side by side, and the thin wire rod 220 is located at the position of the notch 104 of the stator slot 102 (i.e. adjacent to the inner cylindrical cavity of the stator core), and the plurality of flat wire conductors 210 are located at the outer side of the thin wire rod 220 (i.e. close to the outer ring side of the stator core 100), so that the thin wire with a small cross section is located at the position of the notch 104 where the skin effect is easily generated, and the flat wire conductors 210 with a large cross section are located at the position away from the position where the skin effect is easily generated, so that the flat wire conductors 210 with a large cross section are not easily generated with the skin effect, and thus the overall eddy current loss can be reduced.
Furthermore, in other embodiments, each winding unit may include a plurality of slim rods 220 and a plurality of flat wire conductors 210 inserted side by side in the stator slot 102, and the plurality of slim rods 220 are closely arranged at the slot opening side of the stator slot 102 (i.e. adjacent to the inner cavity side of the stator core 100), and the plurality of flat wire conductors 210 are closely arranged at the outer side of the stator slot 102 (i.e. adjacent to the outer ring side of the stator core 100), which may further cause a skin effect to occur at the plurality of slim rods 220 adjacent to the slot opening 104 to reduce the overall eddy current loss. In the present embodiment, the thin wire rods 220 may be provided in 2, 3, or 4, and so on.
Also, the above-described slim rod 220 may include a plurality of strands of round-shaped thin wires arranged in parallel, i.e., the cross-section of the thin wires forming the slim rod 220 may be arranged in a circle. Further, the cross-sectional shape of the thin wire may be set to an oval shape or other shapes. The thin wire rod 220 may be a flat wire rod, so that the shape of the thin wire rod 220 is consistent with the shape of the flat wire conductor 210, and the overall performance is not affected. The wire rod 220 may have a circular or elliptical shape as a whole. The thin wire may be a thin copper wire or another thin metal wire. Each of the flat wire conductors 210 may be a flat copper wire, or may be a flat wire body structure formed of another metal conductor.
Further, in some embodiments, the flat wire conductor 210 is spaced from the slot wall of the stator slot 102, and the slim rod 220 is engaged in the stator slot 102. A certain gap is formed between two ends of the plurality of flat wire conductors 210 in the stator slot 102 and two corresponding side walls of the stator slot 102, so that the flat wire conductors 210 are convenient to install; and no gap is left between two ends of the thin wire rod 220 positioned in the stator slot 102 and two corresponding side walls of the stator slot 102, so that the thin wire rod 220 can be clamped in the stator slot 102 to clamp a plurality of thin wires forming the thin wire rod 102.
Further, as shown in FIG. 3, in some embodiments, each of the slim bars 220 may be provided as a U-shaped bar. Also, the U-shaped bar may include a bar bending portion 222, and one bar straight section 224 connected to both ends of the bar bending portion 222, respectively, the two bar straight sections 224 being inserted into the two stator slots 102, respectively. The bar bending portion 222 may be U-shaped or V-shaped. By providing the slim rods 220 in a U-shaped configuration, it is convenient to embed the two rod straight section portions 224 of the slim rods 220 in the two stator slots 102, respectively, and to connect each rod straight section portion 224 with another slim rod (or flat wire conductor).
The bar bending portion 222 is formed by twisting and bending a single linear bar. Specifically, the linear type fine line rod can be folded in half to form a semi-finished fine line rod which is provided with two linear type rod bodies and is close to each other side by side; and bending the two straight rod bodies in the direction away from each other at the turning end of the semi-finished product fine line rod to form a finished product fine line rod in a twisting form. The thin wire rod formed by winding a plurality of thin wires in parallel is adopted, and the torsion transposition is carried out at the middle end part of the thin wire rod (namely, the middle end part of the thin wire rod is set to be a torsion structure), so that the skin effect can be only generated in the section of the thin wire rod with smaller height, the eddy current loss is further reduced, the circulating current loss generated by winding in parallel can be reduced, and the running performance of the motor can be ensured.
Further, as shown in fig. 4, in some embodiments, each of the above-described flat wire conductors 210 is provided as a U-shaped flat wire. Moreover, the U-shaped flat wire may include a flat wire bending section 212 and two flat wire straight sections 214 respectively connected to two ends of the flat wire bending section 212, and the two flat wire straight sections 214 are respectively inserted into the two stator slots 102. By providing the flat wire conductor 210 with a U-shaped structure, it is convenient to embed the two flat wire linear sections 214 of the flat wire conductor 210 in the two stator slots 102, respectively, and to connect each flat wire linear section 214 with another flat wire conductor (or thin wire rod).
Further, in some embodiments, the ends of the thin wire rods 220 and the ends of the flat wire conductors 210, which are disposed side by side in the same stator slot 102, are welded together. The ends of the two bar straight section portions 224 of the thin bar 220 can be provided as weld ends, and the ends of the two flat wire straight section portions 214 of the flat wire conductors 210 can be provided as weld ends, so that the weld ends of the thin bar 220 in the same stator slot 102 can be welded to the weld ends of the flat wire conductors 210, or the weld ends of one thin bar 220 in the same stator slot 102 can be welded to the weld ends of another thin bar 220, or the weld ends of one flat wire conductor 210 in the same stator slot 102 can be welded to the weld ends of another flat wire conductor 210. In this way, the thin wire rods and the flat wire conductors in the plurality of stator slots of the stator core are connected to form a U-phase winding, a V-phase winding, and a W-phase winding.
In a second aspect, the present invention provides a flat wire motor, including the flat wire stator structure as described above. The utility model provides a flat wire stator structure, when the high-speed operation of flat wire motor, reducible because the high frequency in magnetic field changes and the produced skin effect of the flat wire conductor that is close to notch department, the production of reducible eddy current loss to guarantee the runnability of motor. By adopting the method, the eddy current loss caused by the skin effect and the proximity effect when the flat wire motor runs at a high speed can be greatly reduced, and the high-efficiency interval of the flat wire motor can be further improved.
As shown in FIG. 5, by replacing the flat wire conductor near the slot of the stator slot with a plurality of strands of thin wires and winding the thin wire rod, and twisting the thin wire rod at the end, the eddy current loss can be reduced from the original 2.48kW to 1.88kW, and the overall eddy current loss is reduced by about 32%, so that the eddy current loss value of the flat wire motor can be obviously reduced.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
It is noted that, in the present invention, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A flat wire stator structure, comprising:
the stator iron core comprises a cylindrical iron core body with an inner cylindrical cavity; a plurality of stator slots extending along the axial direction of the iron core body are uniformly formed in the annular end face of the iron core body, and each stator slot is communicated with the inner cylinder cavity of the iron core body through a notch; and the number of the first and second groups,
a stator winding including a winding unit inserted in each of the stator slots; the winding unit comprises a plurality of flat wire conductors which are inserted in the stator slots side by side and at least one thin wire rod which is formed by winding a plurality of strands of thin wires in parallel, wherein the thin wire rod is arranged adjacent to the notches of the stator slots.
2. The flat wire stator structure according to claim 1, wherein each of the winding units includes one of the slim rods and a plurality of the flat wire conductors inserted side by side in the stator slots.
3. The flat wire stator structure according to claim 1, wherein the thin wire bar includes a plurality of strands of the thin wire in a circular shape disposed around a winding;
each flat wire conductor is set to be a flat copper wire.
4. The flat wire stator structure according to claim 1, wherein the thin bar is provided as a flat-shaped bar.
5. The flat wire stator structure of claim 1, wherein there is a gap between the flat wire conductors and the stator slots in which the slim rods are lodged.
6. The flat wire stator structure according to any one of claims 1 to 5, wherein each of the thin bars is provided as a U-shaped bar;
the U-shaped bar comprises a bar bending part and two bar straight line sections which are respectively connected to two ends of the bar bending part, and the two bar straight line sections are respectively inserted into the two stator slots.
7. The flat wire stator structure of claim 6, wherein the bar bend is formed by twist bending a length of straight bar.
8. The flat wire stator structure according to any one of claims 1 to 5, wherein each of the flat wire conductors is provided as a U-shaped flat wire;
the U-shaped flat wire comprises a flat wire bending section part and two flat wire straight line section parts which are respectively connected to two ends of the flat wire bending section part, and the two flat wire straight line section parts are respectively inserted into the two stator slots.
9. The flat wire stator structure according to any one of claims 1 to 5, wherein end portions of the thin wire bars and end portions of the flat wire conductors, which are provided side by side in the same stator slot, are welded.
10. A flat wire electric machine comprising a flat wire stator structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022709579.2U CN213782984U (en) | 2020-11-20 | 2020-11-20 | Flat wire stator structure and flat wire motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022709579.2U CN213782984U (en) | 2020-11-20 | 2020-11-20 | Flat wire stator structure and flat wire motor |
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| Publication Number | Publication Date |
|---|---|
| CN213782984U true CN213782984U (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022709579.2U Active CN213782984U (en) | 2020-11-20 | 2020-11-20 | Flat wire stator structure and flat wire motor |
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| CN (1) | CN213782984U (en) |
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