Stator core, stator and motor

Abstract

The utility model provides a kind of stator core, stator and motor, in the stator core, multiple the yoke portion is arranged along the circumferential direction interval, one separation groove is equipped on each the magnetic bridge, the separation groove separates the magnetic bridge and forms two connecting ends, two connecting ends of each the magnetic bridge and adjacent two the yoke portion are connected, to make the stator core form integrated structure;The outside of each the yoke portion is equipped with a tooth portion, each the tooth portion is located between adjacent two the magnetic bridge, winding groove for accommodating stator winding is formed between each the tooth portion and two the magnetic bridge.The utility model is improved from structure and applies magnetic flux barrier technology, realizes stator core integration design by modifying the overall shape of magnetic bridge, stator core can adopt stamping forming one-time stamping out the profile of yoke portion, magnetic bridge, tooth portion, compared with prior art, can effectively guarantee the structure tolerance of stator core, improve the reliability and efficiency of product production.

Description

Technical Field

[0001] This utility model relates to the field of stator core technology, and in particular to a stator core, stator and motor. Background Technology

[0002] In flux-barrier motors, the stator core structure must completely isolate one or more stator teeth. This means that a magnetic circuit interruption is artificially created in the stator core through specific design or process, preventing magnetic flux from flowing through specific teeth or allowing it to flow only through a predetermined path. Existing stator cores use a modular design, divided into multiple parts, which are assembled into a circle using tooling. This makes it difficult to guarantee the structural tolerances of the stator core, reducing the reliability and efficiency of product manufacturing. Summary of the Invention

[0003] This invention provides a stator core, a stator, and a motor to solve the problem that the structural tolerance of the stator core is difficult to guarantee in the prior art, which reduces the reliability and efficiency of product manufacturing.

[0004] A stator core comprising multiple yokes and multiple magnetic bridges;

[0005] Multiple yokes are arranged at intervals along the circumferential direction. Each magnetic bridge is provided with a partition groove, which separates the magnetic bridge to form two connecting ends. The two connecting ends of each magnetic bridge are connected to two adjacent yokes, so that the stator core forms an integral structure.

[0006] Each of the yokes has a tooth on its outer side, each tooth is located between two adjacent magnetic bridges, and a winding groove for accommodating the stator winding is formed between each tooth and the two magnetic bridges.

[0007] Preferably, each of the magnetic bridges includes a first bridge arm arranged in a circumferential direction, two second bridge arms extending from both ends of the first bridge arm to the same side, and two third bridge arms extending from one end of the two second bridge arms in the same direction; each of the third bridge arms is connected to a yoke.

[0008] The two second bridge arms are arranged symmetrically, and the included angle between each second bridge arm and the first bridge arm is an acute angle.

[0009] The two third bridge arms are arranged symmetrically, and the angle formed between each third bridge arm and the second bridge arm it connects to is an obtuse angle.

[0010] Preferably, the distance between the two second bridge arms gradually increases from the inside to the outside in the radial direction; the distance between the two third bridge arms is 0.75-0.95mm.

[0011] Preferably, the thickness of the magnetic bridge in the axial direction is 0.9-1.2 mm.

[0012] Preferably, a recess is provided at the junction of the connecting end of each magnetic bridge and its corresponding yoke, and the recess is located on the inner side of the yoke; the two recesses corresponding to each magnetic bridge are arranged symmetrically.

[0013] Preferably, each yoke and / or each second bridge arm is provided with a riveting structure arranged in the axial direction, and two adjacent stator cores are connected by a plurality of the riveting structures.

[0014] Preferably, each of the riveting structures includes a rivet point and a rivet buckle. The rivet point is disposed on the first surface of the yoke and / or the second bridge arm in the axial direction, and the rivet buckle is disposed on the second surface of the yoke and / or the second bridge arm in the axial direction. The rivet buckle on one stator core is connected to the rivet point on the other stator core in a one-to-one correspondence.

[0015] Preferably, each of the teeth includes a main body extending radially from the outside of the yoke and two end portions extending circumferentially from opposite sides of the outer end of the main body;

[0016] There is a gap between each of the said ends and one of the said magnetic bridges.

[0017] A stator includes a stator winding and a plurality of stator cores, wherein the plurality of stator cores are stacked sequentially along an axial direction, and the stator winding is wound in the winding groove of the stator core.

[0018] An electric motor includes a rotor and a stator, the rotor being rotatably mounted within the stator.

[0019] The stator core provided in this embodiment of the utility model improves the structure by applying magnetic flux barrier technology. By modifying the overall shape of the magnetic bridge, the stator core is integrated into a single design. The stator core can be stamped in one go to form the contours of the yoke, magnetic bridge, and teeth. Compared with the prior art, this can effectively guarantee the structural tolerance of the stator core, improve the reliability and efficiency of product manufacturing, and maintain the motor performance characteristics of the magnetic flux barrier motor while reducing costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1This is a first axonometric view of the stator in one embodiment of the present invention;

[0022] Figure 2 This is a second axonometric view of the stator in one embodiment of the present invention;

[0023] Figure 3 This is a front view of the stator in one embodiment of the present invention.

[0024] Among them, 1. yoke; 2. magnetic bridge; 21. partition groove; 22. first bridge arm; 23. second bridge arm; 24. third bridge arm; 3. tooth; 31. main body; 32. end; 4. winding groove; 5. recess; 6. riveting structure; 61. rivet point; 62. rivet buckle. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] In the description of this application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, 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, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] This utility model provides a stator core, referring to... Figures 1-3The stator core includes multiple yokes 1 and multiple magnetic bridges 2; the multiple yokes 1 are arranged at intervals along the circumferential direction, and each magnetic bridge 2 is provided with a partition groove 21, which separates the magnetic bridge 2 to form two connecting ends. The two connecting ends of each magnetic bridge 2 are connected to two adjacent yokes 1 so that the stator core forms an integral structure; each yoke 1 is provided with a tooth 3 on its outer side, and each tooth 3 is located between two adjacent magnetic bridges 2. A winding groove 4 for accommodating the stator winding is formed between each tooth 3 and the two magnetic bridges 2.

[0029] As an example, the stator core, used to manufacture the stator of a motor, specifically includes multiple yokes 1 and multiple magnetic bridges 2. In the design, the multiple yokes 1 are arranged at intervals along the circumference, forming a ring-shaped skeleton for the stator core. Each magnetic bridge 2 has a dividing groove 21, which separates the magnetic bridge 2 into two connecting ends. The magnetic bridge 2 is designed as a "broken bridge" structure, which can block short-circuit paths of magnetic flux within the magnetic bridge 2, reducing eddy current losses. The two connecting ends of each magnetic bridge 2 are connected to two adjacent yokes 1, so that the stator core forms an integral structure, ensuring mechanical strength. Specifically, the stator core can be manufactured using only ordinary stamping processes, thus reducing manufacturing steps and effectively lowering costs. Each yoke 1 has a tooth 3 on its outer side. The direct connection between the yoke 1 and the tooth 3 reduces magnetic resistance, making the magnetic flux more concentrated in the tooth 3, and improving magnetic utilization. Each tooth 3 is located between two adjacent magnetic bridges 2, and a winding groove 4 is formed between each tooth 3 and the two magnetic bridges 2. The winding groove 4 is used to accommodate the stator winding for stator fabrication. In this example, magnetic flux barrier technology is applied to improve the structure. By modifying the overall shape of the magnetic bridges 2, an integrated stator core design is achieved. The stator core can be stamped out in one piece using stamping, forming the contours of the yoke 1, magnetic bridges 2, and tooth 3. Compared with existing technologies, this effectively ensures the structural tolerance of the stator core, improves the reliability and efficiency of product manufacturing, and maintains the motor performance characteristics of the magnetic flux barrier motor while reducing costs. Each partition groove 21 is arranged between two teeth 3 of the stator core, which can also be described as the area between two winding grooves 4, and the partition groove 21 is arranged radially. This modification significantly reduces any unwanted harmonic components of the magnetomotive force (all harmonic components not used as the operating wave are considered unwanted). Reducing unwanted harmonics can improve motor efficiency and / or reduce unwanted hearing damage and vibration.

[0030] In one embodiment, reference is made to Figure 1Each magnetic bridge 2 includes a first bridge arm 22 arranged along the circumferential direction, two second bridge arms 23 extending from both ends of the first bridge arm 22 to the same side, and two third bridge arms 24 extending from one end of the two second bridge arms 23 in the same direction; each third bridge arm 24 is connected to a yoke 1; the two second bridge arms 23 are symmetrically arranged, and the included angle between each second bridge arm 23 and the first bridge arm 22 is an acute angle; the two third bridge arms 24 are symmetrically arranged, and the included angle between each third bridge arm 24 and the second bridge arm 23 connected to it is an obtuse angle.

[0031] As an example, the structure of each magnetic bridge 2 is described, specifically including a first bridge arm 22, two second bridge arms 23, and two third bridge arms 24. The first bridge arm 22 is arranged in a circumferential direction, the two second bridge arms 23 are components extending from both ends of the first bridge arm 22 to the same side, and the two third bridge arms 24 are components extending from one end of the two second bridge arms 23 in the same direction. The first bridge arm 22, the two second bridge arms 23, and the two third bridge arms 24 cooperate to form a partition groove 21. The magnetic bridge 2 is designed as a "broken bridge" structure, which can block the short-circuit path of magnetic flux in the magnetic bridge 2 and reduce eddy current losses. Each third bridge arm 24 is connected to a yoke 1 so that the stator core forms an integral structure, which can ensure mechanical strength. Specifically, the stator core can be manufactured by ordinary stamping process, which can reduce the steps in product manufacturing and effectively reduce costs. The two second bridge arms 23 are symmetrically arranged, and the angle formed between each second bridge arm 23 and the first bridge arm 22 is an acute angle; the two third bridge arms 24 are symmetrically arranged, and the angle formed between each third bridge arm 24 and the second bridge arm 23 it connects to is an obtuse angle. This arrangement makes the overall structure of the magnetic bridge 2 symmetrical in the radial direction. Moreover, by adjusting the size of the angle according to actual needs, the electromagnetic field distribution of the stator core can be optimized, the space utilization rate can be improved, the mechanical reliability can be enhanced, the torque can be increased, and the performance of the motor can be significantly improved.

[0032] In one embodiment, reference is made to Figure 1 The distance between the two second bridge arms 23 gradually increases from the inside to the outside in the radial direction; the distance between the two third bridge arms 24 is 0.75-0.95mm.

[0033] As an example, the distance between the two second bridge arms 23 and the distance between the two third bridge arms 24 are limited. The distance between the two second bridge arms 23 gradually increases from the inside to the outside in the radial direction; the distance between the two third bridge arms 24 is 0.75-0.95mm, with an optimal value of 0.85mm. This setting ensures the magnetic flux barrier effect while also ensuring the radial strength of the stator core, enhancing mechanical reliability, increasing torque, and significantly improving the performance of the motor.

[0034] In one embodiment, reference is made to Figure 1The thickness of magnetic bridge 2 in the axial direction is 0.9-1.2mm.

[0035] As an example, the thickness of the magnetic bridge 2 in the axial direction is limited to 0.9-1.2mm. This setting ensures the magnetic flux barrier effect while also ensuring the axial and radial strength of the stator core, enhancing mechanical reliability, increasing torque, and significantly improving the performance of the motor.

[0036] In one embodiment, reference is made to Figures 1-3 Each magnetic bridge 2 has a recess 5 at the junction of its connecting end and its corresponding yoke 1. The recess 5 is located on the inner side of the yoke 1. The two recesses 5 corresponding to each magnetic bridge 2 are arranged symmetrically.

[0037] As an example, in the design, a recess 5 is provided at the junction of the connection end of each magnetic bridge 2 and its corresponding yoke 1. The recess 5 is located inside the yoke 1. This design of the recess 5 can reduce the undesirable harmonic components of the stator core's magnetomotive force. The two recesses 5 corresponding to each magnetic bridge 2 are symmetrically arranged, and the two recesses 5 cooperate to form a recess that communicates with the partition groove 21, which can further reduce the undesirable harmonic components of the stator core's magnetomotive force, thereby improving the efficiency of the motor and / or reducing undesirable hearing damage and vibration.

[0038] In one embodiment, reference is made to Figure 3 Each yoke 1 and / or each second bridge arm 23 is provided with a riveting structure 6 arranged in the axial direction, and two adjacent stator cores are connected by multiple riveting structures 6.

[0039] Currently, existing stator cores are mostly joined using adhesive bonding, which is costly, complex, and difficult to automate. To address this issue, the stator core in this example features axially arranged riveting structures 6 on each yoke 1 and / or each second bridge arm 23. Adjacent stator cores are connected by multiple riveting structures 6, thus assembling adjacent stator cores into a single unit. This simplifies the manufacturing process, avoids additional adhesive bonding costs, saves costs, and improves production efficiency. To ensure the advantages of the magnetic flux barrier technology, namely cost reduction and efficiency improvement, the riveting structure 6 is set at the yoke 1 and / or the second bridge arm 23. Specifically, there are three arrangements of the riveting structure 6: the first is to set the riveting structure 6 only on each yoke 1; the second is to set the riveting structure 6 only on each second bridge arm 23; and the third is to set the riveting structure 6 on both each yoke 1 and each second bridge arm 23. This arrangement isolates the magnetic circuit of the stator core without affecting the overall structural tolerance and structural strength, thereby realizing the magnetic flux barrier technology and ensuring the performance advantage of increasing performance with the same materials. Moreover, setting the riveting structure 6 at the yoke 1 and / or the second bridge arm 23 minimizes the unwanted harmonic components of the stator core. Suppressing unwanted harmonic components can improve the efficiency of the motor and / or reduce unwanted hearing damage and vibration effects.

[0040] In one embodiment, reference is made to Figure 1 and Figure 2 Each riveting structure 6 includes a rivet point 61 and a rivet 62. The rivet point 61 is disposed on the first surface of the yoke 1 and / or the second bridge arm 23 in the axial direction, and the rivet 62 is disposed on the second surface of the yoke 1 and / or the second bridge arm 23 in the axial direction. The rivet 62 on one stator core is connected to the rivet point 61 on another stator core in a one-to-one correspondence.

[0041] As an example, the structure of each riveting structure 6 is described. The riveting structure 6 includes a rivet point 61 and a rivet buckle 62. In the design, the rivet point 61 is located on the first surface of the yoke 1 and / or the second bridge arm 23 in the axial direction, and the rivet buckle 62 is located on the second surface of the yoke 1 and / or the second bridge arm 23 in the axial direction. Specifically, the rivet point 61 and the rivet buckle 62 are manufactured on the yoke 1 and / or the second bridge arm 23 using a stamping process. During installation, the rivet buckle 62 on one stator core is correspondingly fastened to the rivet point 61 on another stator core. This facilitates the assembly of two adjacent stator cores into a single unit, simplifies the processing, avoids additional bonding costs, saves costs, and improves production efficiency.

[0042] In one embodiment, reference is made to Figure 3Each yoke 1 is an arc-shaped structure, which makes the magnetic flux path closer to a semi-circle, reduces magnetic resistance, and disperses mechanical stress. Multiple yokes 1 enclose a ring structure, so that the magnetic flux forms a closed loop in the yoke, avoiding magnetic flux leakage. The overall structure is in force balance, which can reduce local stress concentration.

[0043] In one embodiment, reference is made to Figure 1 Each tooth 3 includes a main body 31 extending radially from the outside of the yoke 1 and two end portions 32 extending circumferentially from opposite sides of the outer end of the main body 31; each end portion 32 has a gap with a magnetic bridge 2.

[0044] As an example, each tooth 3 includes a main body 31 and two ends 32; the main body 31 is a component extending radially from the outside of the yoke 1, and the two ends 32 are components extending circumferentially from opposite sides of the outer end of the main body 31. There is a gap between each end 32 and a magnetic bridge 2. In this arrangement, the main body 31 and the two ends 32 form a T-shaped structure, which can disperse mechanical stress; the radial force is borne by the main body 31, and the circumferential force (such as rotor centrifugal force or stator vibration torque) is dispersed by the ends 32 and the gap, avoiding stress concentration at the tooth root; the gap allows the ends 32 to deform slightly when subjected to force, absorbing some energy (such as vibration impact) and reducing the risk of cracking.

[0045] This utility model embodiment provides a stator, with reference to... Figures 1-3 It includes a stator winding and multiple stator cores, with the multiple stator cores stacked sequentially along the axial direction, and the stator winding wound in the winding groove 4 of the stator core.

[0046] As an example, the stator includes stator windings and multiple stator cores, each stator core comprising multiple yokes 1 and multiple magnetic bridges 2. In the design, the multiple yokes 1 are arranged at intervals along the circumference, forming a ring-shaped skeleton of the stator core. Each magnetic bridge 2 has a dividing slot 21, which separates the magnetic bridge 2 into two connecting ends. The magnetic bridge 2 is designed as a "broken bridge" structure, which can block short-circuit paths of magnetic flux within the magnetic bridge 2, reducing eddy current losses. The two connecting ends of each magnetic bridge 2 are connected to two adjacent yokes 1, so that the stator core forms an integral structure, ensuring mechanical strength. Specifically, the stator core can be manufactured using only ordinary stamping processes, thus reducing manufacturing steps and effectively lowering costs. Each yoke 1 has a tooth 3 on its outer side. The direct connection between the yoke 1 and the tooth 3 reduces magnetic resistance, concentrating magnetic flux more in the tooth 3 and improving magnetic utilization. Each tooth 3 is located between two adjacent magnetic bridges 2, and a winding groove 4 is formed between each tooth 3 and the two magnetic bridges 2. The winding groove 4 is used to accommodate the stator winding for stator fabrication. In this example, magnetic flux barrier technology is applied to improve the structure. By modifying the overall shape of the magnetic bridges 2, an integrated stator core design is achieved. The stator core can be stamped out in one piece using stamping, forming the contours of the yoke 1, magnetic bridges 2, and tooth 3. Compared with existing technologies, this effectively ensures the structural tolerance of the stator core, improves the reliability and efficiency of product manufacturing, and maintains the motor performance characteristics of the magnetic flux barrier motor while reducing costs. Each partition groove 21 is arranged between two teeth 3 of the stator core, which can also be described as the area between two winding grooves 4, and the partition groove 21 is arranged radially. This modification significantly reduces any unwanted harmonic components of the magnetomotive force (all harmonic components not used as the operating wave are considered unwanted). Reducing unwanted harmonics can improve motor efficiency and / or reduce unwanted hearing damage and vibration.

[0047] Multiple stator cores are stacked sequentially along the axial direction, and stator windings are wound in the winding grooves 4 of the stator cores. Each yoke 1 and / or each second bridge arm 23 is provided with a riveting structure 6 arranged along the axial direction. Two adjacent stator cores are connected by multiple riveting structures 6. In this way, two adjacent stator cores are assembled into one piece by riveting structures 6. The processing technology is simple, no additional bonding costs are added, costs are saved and production efficiency is improved.

[0048] This utility model provides an electric motor, including a rotor and a stator, wherein the rotor is rotatably mounted inside the stator.

[0049] As an example, the motor includes a rotor and a stator, with the rotor rotatably mounted within the stator in the above embodiment to make the motor a flux-barrier motor.

[0050] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A stator core, characterized in that, Includes multiple yokes and multiple magnetic bridges; Multiple yokes are arranged at intervals along the circumferential direction. Each magnetic bridge is provided with a partition groove, which separates the magnetic bridge to form two connecting ends. The two connecting ends of each magnetic bridge are connected to two adjacent yokes, so that the stator core forms an integral structure. Each of the yokes has a tooth on its outer side, each tooth is located between two adjacent magnetic bridges, and a winding groove for accommodating the stator winding is formed between each tooth and the two magnetic bridges.

2. The stator core according to claim 1, characterized in that, Each of the magnetic bridges includes a first bridge arm arranged in a circumferential direction, two second bridge arms extending from both ends of the first bridge arm to the same side, and two third bridge arms extending from one end of the two second bridge arms in the same direction; each of the third bridge arms is connected to a yoke. The two second bridge arms are arranged symmetrically, and the included angle between each second bridge arm and the first bridge arm is an acute angle. The two third bridge arms are arranged symmetrically, and the angle formed between each third bridge arm and the second bridge arm it connects to is an obtuse angle.

3. The stator core according to claim 2, characterized in that, The distance between the two second bridge arms gradually increases radially from the inside to the outside; the distance between the two third bridge arms is 0.75-0.95 mm.

4. The stator core according to claim 1, characterized in that, The thickness of the magnetic bridge in the axial direction is 0.9-1.2 mm.

5. The stator core according to claim 1, characterized in that, Each magnetic bridge has a recess at the junction of its connecting end and its corresponding yoke, the recess being located on the inner side of the yoke; the two recesses corresponding to each magnetic bridge are arranged symmetrically.

6. The stator core according to claim 2, characterized in that, Each yoke and / or each second bridge arm is provided with a riveting structure arranged in the axial direction, and two adjacent stator cores are connected by a plurality of the riveting structures.

7. The stator core according to claim 6, characterized in that, Each of the riveting structures includes a rivet point and a rivet buckle. The rivet point is disposed on the first surface of the yoke and / or the second bridge arm in the axial direction, and the rivet buckle is disposed on the second surface of the yoke and / or the second bridge arm in the axial direction. The rivet buckle on one stator core is connected to the rivet point on the other stator core in a one-to-one correspondence.

8. The stator core according to claim 1, characterized in that, Each of the teeth includes a main body extending radially from the outside of the yoke and two end portions extending circumferentially from opposite sides of the outer end of the main body; There is a gap between each of the said ends and one of the said magnetic bridges.

9. A stator, characterized in that, It includes a stator winding and a plurality of stator cores as described in any one of claims 1-8, wherein the plurality of stator cores are stacked sequentially along the axial direction, and the stator winding is wound in the winding groove of the stator core.

10. An electric motor, characterized in that, It includes a rotor and a stator as described in claim 9, wherein the rotor is rotatably mounted within the stator.

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