Stator core and motors and electrical control equipment containing it.

Abstract

This utility model discloses a stator core and a motor and electrical control device having the same. The stator core includes multiple segmented cores, each segmented core comprising teeth, segmented yokes, and segmented slot wedges. The segmented yokes and slot wedges are located at both ends of the teeth in the radial direction of the stator core. The teeth, segmented yokes, and slot wedges together define a receiving slot for accommodating coil windings. A first sidewall of the segmented yoke defines a sidewall of the receiving slot. The first sidewall includes a first wall portion and a second wall portion. The first wall portion is connected to the teeth and is formed as a plane perpendicular to the teeth. One end of the second wall portion is connected to the first wall portion, and the other end of the second wall portion is located on the side of the first wall portion facing the slot wedge in the radial direction of the stator core. The stator core according to this utility model solves the problem of excessively narrow ends of the segmented yokes, reduces the magnetic saturation of the segmented yokes, and facilitates increased torque output and torque linearity of the motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a stator core and a motor and electrical control equipment having the stator core. Background Technology

[0002] In the segmented stator design of related technologies, the radial dimension of the yoke of each segment unit is strictly constrained by the stator outer diameter and the space requirements within the slots. In order to leave enough space in the stator slots to accommodate the winding coils, the ends of the segmented yokes are often excessively narrowed in structure, resulting in a significant reduction in the effective magnetic cross-sectional area of ​​this region. This narrow region will be the first to produce severe magnetic saturation when the motor is running under high load, becoming a bottleneck in the entire magnetic circuit. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a stator core that solves the problem of excessively narrow ends of the segmented yoke, reduces the magnetic saturation of the segmented yoke, and facilitates increased torque output and torque linearity of the motor.

[0004] This utility model also proposes a motor having the aforementioned stator core.

[0005] This utility model also proposes an electrical control device having the aforementioned motor.

[0006] A stator core according to a first aspect of the present invention includes: a plurality of segmented cores, each segmented core including teeth, segmented yokes, and segmented slot wedges. The segmented yokes and the segmented slot wedges are located at both ends of the teeth in the radial direction of the stator core. The teeth, the segmented yokes, and the segmented slot wedges together define a receiving groove for accommodating coil windings. A first sidewall of the segmented yoke defines a sidewall of the receiving groove. The first sidewall includes a first wall portion and a second wall portion. The first wall portion is connected to the teeth and is formed as a plane perpendicularly connected to the teeth. One end of the second wall portion is connected to the first wall portion in the radial direction of the stator core, and the other end of the second wall portion is located on the side of the first wall portion facing the segmented slot wedge.

[0007] The stator core according to the present invention solves the problem of excessively narrow ends of the segmented yoke, reduces the magnetic saturation of the segmented yoke, and facilitates increasing the torque output and torque linearity of the motor.

[0008] In addition, the stator core according to the above embodiments of this utility model may also have the following additional technical features: According to some embodiments of this utility model, on a cross section perpendicular to the axial direction of the stator core, the projection of the second wall portion is a straight line, an arc, a broken line, or a wave.

[0009] According to some embodiments of the present invention, on a cross section perpendicular to the axial direction of the stator core, the projection of the outer periphery of the stator core is circular, the projection of the second wall portion is arc-shaped, and the circle to which the projection of the second wall portion belongs is concentric with the projection of the outer periphery of the stator core.

[0010] According to some optional embodiments of the present invention, the first wall portion is formed as a tangent surface to the second wall portion.

[0011] According to some optional embodiments of the present invention, on a cross section perpendicular to the axial direction of the stator core, the projection of the segmented slot wedge facing away from the side wall of the receiving groove is arc-shaped, and the circle to which the projection of the segmented slot wedge facing away from the side wall of the receiving groove belongs is concentric with the projection of the outer periphery of the stator core.

[0012] According to some embodiments of the present invention, the tooth extends along a first direction, the first wall extends along a second direction, and on the same cross section perpendicular to the axial direction of the stator core, in the second direction, the distance between the end of the segmented slot wedge facing away from the tooth and the tooth is L1, and the length of the first wall in the second direction is L2, where L2≥L1.

[0013] According to some embodiments of the present invention, in the circumferential direction of the stator core, the ends of a plurality of segmented yokes are connected together; in the circumferential direction of the stator core, the ends of a plurality of segmented slot wedges are spaced apart.

[0014] According to some optional embodiments of the present invention, the end faces of adjacent segmented yokes are in planar contact.

[0015] According to a second aspect of the present invention, an electric motor is provided, the electric motor comprising the stator core described in the first aspect of the present invention.

[0016] The motor according to the embodiments of the present invention solves the problem of excessively narrow ends of the segmented yoke by utilizing the stator core described in the first aspect of the present invention, thereby reducing the magnetic saturation of the segmented yoke and facilitating an increase in the motor's torque output and torque linearity.

[0017] According to a third aspect of the present invention, an electrical control device is provided, the electrical control device including the motor described in the second aspect of the present invention.

[0018] The electrical control device according to the embodiment of the present invention solves the problem of the segmented yoke end being too narrow by utilizing the motor described in the embodiment of the second aspect of the present invention, reduces the magnetic saturation of the segmented yoke, and facilitates the increase of the motor's torque output and torque linearity.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the stator core structure according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of two segmented iron cores according to an embodiment of the present utility model; Figure 3 This is a schematic diagram showing the distribution of magnetic lines of force on two segmented iron cores according to an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged view of the central area; Figure 5 This is a schematic diagram of the segmented iron core according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of a structure in which a coil winding is wound on a segmented iron core according to an embodiment of the present utility model.

[0021] Reference numerals: 1000, stator core; 100, segmented core; 101, receiving groove; 10, tooth; 20. Segmented yoke; 21. First sidewall; 211. First wall portion; 212. Second wall portion; 30. Segmented slot wedge; 400. Coil winding. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] The stator core 1000 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0024] like Figures 1-4As shown, the stator core 1000 according to an embodiment of the present invention includes a plurality of segmented cores 100.

[0025] The segmented iron core 100 includes a toothed portion 10, a segmented yoke portion 20, and a segmented slot wedge 30. The segmented yoke portion 20 and the segmented slot wedge 30 are located at both ends of the toothed portion 10 in the radial direction of the stator iron core 1000. The toothed portion 10, the segmented yoke portion 20, and the segmented slot wedge 30 together define a receiving slot 101, which is used to receive the coil winding 400.

[0026] Specifically, the coil winding 400 is adapted to be wound on the tooth 10, the coil winding 400 is located in the receiving groove 101, the segmented yoke 20 and the segmented slot wedge 30 are located at both ends of the tooth 10 in the radial direction to restrict the two ends of the coil winding 400, thereby limiting the position of the coil winding 400 and preventing the coil winding 400 from coming off the two ends of the tooth 10.

[0027] The first sidewall 21 of the segmented yoke 20 defines the sidewall of the receiving groove 101. The first sidewall 21 includes a first wall portion 211 and a second wall portion 212. The first wall portion 211 is connected to the tooth portion 10 and is formed as a plane perpendicular to the tooth portion 10. Specifically, a 90° angle is formed between the first wall portion 211 and the tooth portion 10, which facilitates the arrangement of the coil winding 400 and improves the space utilization of the winding in the receiving groove 101.

[0028] Furthermore, the segmented yoke 20 serves as the main return path for magnetic flux, creating a 90° angle between the first wall portion 211 and the tooth portion 10. When the magnetic lines of force are diverted through the tooth portion 10 to the segmented yoke 20, the direction of the magnetic lines of force can be smooth and natural, making the magnetic circuit short and straight, which facilitates the optimization of the magnetic circuit path. At the same time, this symmetrical and vertical structure helps to achieve a more uniform magnetic flux density distribution on the tooth portion 10 and the segmented yoke 20, avoiding local oversaturation and thus reducing iron loss.

[0029] One end of the second wall portion 212 is connected to the first wall portion 211. In the radial direction of the stator core 1000, the other end of the second wall portion 212 is located on the side of the first wall portion 211 facing the segmented slot wedge 30, so as to adapt to the distribution of magnetic lines of force on the segmented yoke portion 20 and facilitate the reduction of magnetic field loss.

[0030] Specifically, such as Figure 4As shown, the dashed line M is the extension line of the first wall portion 211. Since the side of the segmented yoke portion 20 facing away from the receiving groove 101 is arc-shaped, if the first side wall 21 is kept in the shape of the first wall portion 211, the size of the segmented yoke portion 20 at the upper end of the stator core 1000 circumferential direction will become smaller and smaller. The excessively narrow segmented yoke portion 20 forms a magnetic bottleneck area, which leads to local magnetic field saturation on the segmented yoke portion 20, reduces torque output, increases iron loss and copper loss, reduces the linearity of motor torque control, and results in low utilization of the internal space of the receiving groove 101.

[0031] To address the issue of the excessively small size of the segmented yoke 20 at its upper end in the 1000-circumference direction of the stator core, this invention connects one end of the second wall portion 212 to the first wall portion 211, and extends the other end of the second wall portion 212 in a direction away from the tooth portion 10 and towards the segmented slot wedge 30. This increases the size of the segmented yoke 20 at its upper end in the 1000-circumference direction of the stator core, solves the problem of the segmented yoke 20 being too narrow at the end, reduces the magnetic saturation of the segmented yoke 20, and facilitates an increase in the torque output and torque linearity of the motor. At the same time, by increasing the size of the end of the segmented yoke 20, the number of conductive magnetic lines of force on the segmented yoke 20 is also increased, which facilitates a reduction in the magnetic reluctance of this part of the magnetic field.

[0032] Therefore, the stator core 1000 according to the present invention solves the problem of the segmented yoke 20 being too narrow at the end, reduces the magnetic saturation of the segmented yoke 20, and facilitates the increase of the motor's torque output and torque linearity.

[0033] The stator core 1000 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0034] In some specific embodiments of this utility model, such as Figures 1-4 As shown, the stator core 1000 includes multiple segmented cores 100.

[0035] In some embodiments of this utility model, the projection of the second wall portion 212 on a cross section perpendicular to the axial direction of the stator core 1000 is a straight line, an arc, a broken line, or a wave.

[0036] Specifically, the second wall portion 212 is located on the side of the segmented yoke portion 20 facing the receiving groove 101. Therefore, the shape of the second wall portion 212 will not affect the outer peripheral shape of the stator core 1000, and thus will not affect the installation and fixation of the stator core 1000.

[0037] The shape of the second wall portion 212 can be determined according to actual needs. For example, the shape of the second wall portion 212 can be determined according to the position of the magnetic lines of force on the segmented yoke portion 20. No restrictions are imposed here.

[0038] In some embodiments of this utility model, such as Figure 1 , Figure 5 As shown, on a cross section perpendicular to the axial direction of the stator core 1000, the projection of the outer periphery of the stator core 1000 is circular, and the projection of the second wall portion 212 is arc-shaped. The circle to which the projection of the second wall portion 212 belongs is concentric with the projection of the outer periphery of the stator core 1000.

[0039] Specifically, the side of the multiple segmented yokes 20 facing away from the receiving groove 101 defines the outer periphery of the stator core 1000, so that the circle to which the projection of the second wall portion 212 belongs is concentric with the projection of the outer periphery of the stator core 1000. In this way, an annular portion is formed in the radial direction of the stator core 1000 between the side wall of the segmented yoke 20 facing away from the receiving groove 101 and the second wall portion 212. The size of the annular portion formed by the segmented yoke 20 in the radial direction of the stator core 1000 is uniform. In this way, while increasing the end size of the segmented yoke 20, the optimal space utilization of the segmented yoke 20 can be achieved. At the same time, the span of the arc of the second wall portion 212 covers the part not covered by the original winding arrangement, increasing the cross-sectional area of ​​the magnetic field line channel, which facilitates the increase of motor torque output.

[0040] like Figure 4 As shown, the dashed line M is the extension of the first wall portion 211. By setting the second wall portion 212, the number of conductive magnetic lines of force on the segmented yoke portion 20 is increased. This facilitates a reduction in the magnetic reluctance of this part of the magnetic field, thereby increasing the output torque of the motor. At the same time, due to the reduction in magnetic flux density and saturation, the nonlinear characteristics of the segmented yoke portion 20 are reduced, thereby improving the control characteristics of the motor torque. Furthermore, the reduction in magnetic flux density can lead to a partial reduction in core losses.

[0041] Furthermore, although the second wall portion 212 will affect the area inside the receiving groove 101, the portion of the second wall portion 212 facing into the receiving groove 101 belongs to the area inside the receiving groove 101 where the wire is not wound, and the original winding method will not be affected.

[0042] In some embodiments, such as Figure 3 , Figure 4 As shown, the curvature of the second wall portion 212 on the multiple segmented iron cores 100 is the same, and when the multiple segmented iron cores 100 are assembled together, two adjacent second wall portions 212 are connected by an arc transition.

[0043] In some embodiments of this utility model, such as Figure 4 , Figure 5 As shown, the first wall portion 211 is formed as the tangent surface of the second wall portion 212 so that the first wall portion 211 and the second wall portion 212 are smoothly connected. In this way, when the coil winding 400 is wound in the receiving groove 101, the connection between the first wall portion 211 and the second wall portion 212 can be avoided from causing the coil winding 400 to rub against it, which makes it easier to reduce the difficulty of winding.

[0044] In some embodiments of this utility model, such as Figure 4 , Figure 5 As shown, Figure 1 As shown, on a cross section perpendicular to the axial direction of the stator core 1000, the projection of the segmented slot wedge 30 onto the side wall of the receiving slot 101 is arc-shaped, and the circle to which the projection of the segmented slot wedge 30 onto the side wall of the receiving slot 101 belongs is concentric with the projection of the outer periphery of the stator core 1000.

[0045] Specifically, when multiple segmented iron cores 100 are assembled to form a stator iron core 1000, multiple segmented slot wedges 30 are arranged circumferentially along the stator iron core 1000. Among them, the multiple segmented slot wedges 30 form the inner ring of the stator iron core 1000 on the side wall opposite to the receiving slot 101, and the multiple segmented yokes 20 form the outer ring of the stator iron core 1000 on the side wall opposite to the receiving slot 101.

[0046] The projection of the segmented slot wedge 30 onto the side wall of the receiving slot 101 is made concentric with the projection of the outer circumference of the stator core 1000, so that the inner and outer rings of the stator core 1000 are concentric. This can improve the strength of the stator core 1000 and increase the uniform mechanical strength of the stator core 1000 in the circumferential direction.

[0047] Furthermore, this eliminates concerns about interference between multiple segmented slot wedges 30 when assembling them. Specifically, each segmented slot wedge 30 has the same shape, eliminating the need to sort the multiple segmented iron cores 100 and reducing assembly difficulty.

[0048] In some embodiments of this utility model, such as Figure 5 As shown, the tooth 10 extends along the first direction, and the first wall 211 extends along the second direction. On the same cross section perpendicular to the axial direction of the stator core 1000, in the second direction, the distance between the end of the segmented slot wedge 30 facing away from the tooth 10 and the tooth 10 is L1, and the length of the first wall 211 in the second direction is L2, where L2≥L1.

[0049] Specifically, the segmented slot wedge 30 serves to support the coil winding 400. The coil winding 400 will not exceed the end of the segmented slot wedge 30 facing away from the tooth portion 10, ensuring that L2 ≥ L1. This allows the first sidewall 21 to have sufficient length to support the coil winding 400 together with the segmented slot wedge 30. Simultaneously, when the second wall portion 212 begins to extend towards the segmented slot wedge 30, although the second wall portion 212 affects the area within the receiving slot 101, the portion of the second wall portion 212 facing into the receiving slot 101 belongs to the unwound area within the receiving slot 101. The original winding method of the coil winding 400 will not be affected, nor will the original arrangement of the windings inside the receiving slot 101 be affected, thus ensuring the winding density of the coil winding 400.

[0050] In some embodiments of this utility model, such as Figure 1 As shown, the ends of multiple segmented yokes 20 are connected in the circumferential direction of the stator core 1000; the ends of multiple segmented slot wedges 30 are spaced apart in the circumferential direction of the stator core 1000. When the ends of multiple segmented yokes 20 are connected to form the stator core 1000, the ends of the segmented slot wedges 30 are spaced apart to avoid interference between adjacent two segmented slot wedges 30, which would affect the assembly of multiple segmented cores 100.

[0051] In some optional embodiments of this utility model, such as Figure 2 , Figure 3 As shown, the end faces of adjacent segmented yokes 20 are in planar contact so that there is sufficient contact surface between two adjacent segmented yokes 20, which facilitates improving the connection strength between multiple segmented iron cores 100.

[0052] In some embodiments, the segmented iron core 100 is adapted to be disposed within the housing of the motor. Multiple segmented iron cores 100 are arranged circumferentially within the housing. In the radial direction of the stator iron core 1000, the arcuate sidewall of the segmented yoke 20 facing away from the tooth 10 is in contact with the inner wall of the housing. In the circumferential direction of the stator iron core 1000, due to the constraint of the inner wall of the housing, the end faces of adjacent segmented yokes 20 abut against each other, thereby fixing multiple segmented iron cores 100 to form a stator iron core 1000 within the housing.

[0053] Other configurations and operations of the stator core 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0054] The following describes a motor according to an embodiment of the present invention. The motor according to an embodiment of the present invention includes a stator core 1000 according to the above embodiment of the present invention.

[0055] The motor according to the present invention solves the problem of the segmented yoke 20 being too narrow at the end by utilizing the stator core 1000 according to the above embodiment of the present invention, thereby reducing the magnetic saturation of the segmented yoke 20 and facilitating the increase of the motor's torque output and torque linearity.

[0056] Other configurations and operations of the motor according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0057] The following describes an electrical control device according to an embodiment of the present invention. The electrical control device according to an embodiment of the present invention includes a motor according to the above-described embodiment of the present invention.

[0058] The electrical control device according to the present invention solves the problem of the segmented yoke 20 being too narrow at the end by utilizing the motor according to the above embodiment of the present invention, reduces the magnetic saturation of the segmented yoke 20, and facilitates the increase of the motor's torque output and torque linearity.

[0059] The electrical control equipment mentioned here can be power tools, electric vehicles, robots, electric cars, ships, spacecraft, etc.

[0060] Spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0061] Other components and operations of the electrical control equipment according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0062] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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 utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0063] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0064] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that, include: Multiple segmented iron cores, each segmented iron core including teeth, segmented yokes, and segmented slot wedges, wherein the segmented yokes and the segmented slot wedges are located at both ends of the teeth in the radial direction of the stator iron core, and the teeth, the segmented yokes, and the segmented slot wedges together define a receiving slot for accommodating coil windings. The first sidewall of the segmented yoke defines the sidewall of the receiving groove. The first sidewall includes a first wall portion and a second wall portion. The first wall portion is connected to the tooth portion and is formed as a plane perpendicularly connected to the tooth portion. One end of the second wall portion is connected to the first wall portion. In the radial direction of the stator core, the other end of the second wall portion is located on the side of the first wall portion facing the segmented groove wedge.

2. The stator core according to claim 1, characterized in that, On a cross section perpendicular to the axial direction of the stator core, the projection of the second wall portion is a straight line, an arc, a broken line, or a wave.

3. The stator core according to claim 1, characterized in that, On a cross section perpendicular to the axial direction of the stator core, the projection of the outer periphery of the stator core is circular, the projection of the second wall portion is arc-shaped, and the circle to which the projection of the second wall portion belongs is concentric with the projection of the outer periphery of the stator core.

4. The stator core according to claim 3, characterized in that, The first wall portion is formed as a tangent surface to the second wall portion.

5. The stator core according to claim 3, characterized in that, On a cross section perpendicular to the axial direction of the stator core, the projection of the segmented slot wedge onto the side wall of the receiving slot is arc-shaped, and the circle to which the projection of the segmented slot wedge onto the side wall of the receiving slot belongs is concentric with the projection of the outer periphery of the stator core.

6. The stator core according to claim 1, characterized in that, The tooth extends along a first direction, and the first wall extends along a second direction. On the same cross-section perpendicular to the axial direction of the stator core, in the second direction, the distance between the end of the segmented slot wedge facing away from the tooth and the tooth is L1, and the length of the first wall in the second direction is L2, where L2 ≥ L1.

7. The stator core according to claim 1, characterized in that, In the circumferential direction of the stator core, the ends of a plurality of segmented yokes are connected; in the circumferential direction of the stator core, the ends of a plurality of segmented slot wedges are spaced apart.

8. The stator core according to claim 7, characterized in that, The end faces of adjacent segmented yokes are in planar contact.

9. An electric motor, characterized in that, Includes a stator core, wherein the stator core is the stator core of any one of claims 1-8.

10. An electrical control device, characterized in that, Includes the motor as described in claim 9.

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