Block stator punching sheet, stator and motor
The block stator punching sheet design addresses magnetic field saturation issues by maintaining consistent yoke width and increasing the magnetic field channel area, enhancing torque output and reducing losses in permanent magnet synchronous servo motors.
Patent Information
- Application Number
- CN202421068301.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-15
AI Technical Summary
Existing permanent magnet synchronous servo motors face issues with the right-angle segmented stator technology, which results in localized magnetic field saturation, reduced torque output, increased iron and copper loss, and reduced torque control linearity due to the narrowing width of the stator yoke.
A block stator punching sheet design with a tooth portion and yoke portion, featuring a shoulder with a gradually increasing distance from the tooth body, and a second connecting surface that transitions smoothly, maintaining consistent yoke width and increasing the cross-sectional area of the magnetic field magnetic line channel.
This design reduces magnetic resistance, enhances torque output, improves torque control characteristics, and decreases iron and copper losses by maintaining consistent yoke width and reducing magnetic flux density.
Smart Images
Figure CN222262260U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a block stator punching sheet and a stator and a motor having the block stator punching sheet. Background Art
[0002] In the prior art, most permanent magnet synchronous servo motors use right-angle segmented stator technology, that is, the teeth and yoke of the segmented stator punching sheets are arranged at a right angle. Affected by the right-angle shape, the width of the yoke gradually narrows in the direction away from the teeth. As a result, the width of the magnetic conductive area of the yoke gradually narrows accordingly. The gradual narrowing of the width of the magnetic conductive area will form a bottleneck area of magnetic conductivity, resulting in local magnetic field saturation, reducing the torque output of the motor, increasing the iron loss and copper loss of the motor, and reducing the linearity of torque control. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a block stator punching sheet to reduce the magnetic field saturation degree of the stator yoke part and increase the torque output and torque control linearity.
[0004] The utility model also provides a stator and a motor having the divided stator punching sheets.
[0005] According to the embodiment of the first aspect of the utility model, the segmented stator punching sheet includes a tooth portion and a yoke portion; the tooth portion includes a tooth body; the yoke portion is arranged at one end of the tooth body, and the yoke portion extends in a direction away from the tooth body along the circumference of the stator, the yoke portion includes a connecting portion and a shoulder portion, the connecting portion is connected to the tooth body, the shoulder portion is located at the end of the connecting portion away from the tooth body, the connecting portion has a first connecting surface on the side facing the tooth body, the first connecting surface is a plane, and the first connecting surface is arranged at a right angle to the wall surfaces on both sides of the tooth body along the circumference of the stator, the shoulder portion has a second connecting surface, the first connecting surface is connected to the second connecting surface, and the distance between the second connecting surface and the plane where the first connecting surface is located gradually increases along the direction away from the tooth body.
[0006] The segmented stator punching sheets according to the embodiment of the utility model have at least the following beneficial effects: the segmented stator punching sheets according to the embodiment of the utility model increase the width of the shoulder away from the end of the tooth portion, so that the width of the yoke of the segmented stator punching sheets remains basically consistent, thereby eliminating the bottleneck area affecting the magnetic conductivity, and increasing the cross-sectional area of the magnetic field magnetic line channel of the segmented stator yoke, so that the magnetic resistance of the magnetic field of the yoke is reduced, thereby increasing the torque output; due to the increase in the cross-sectional area of the magnetic field magnetic line channel, the magnetic flux density is reduced, the saturation degree is reduced, and the nonlinear characteristics of the yoke are reduced, thereby correspondingly improving the torque control characteristics, and the reduction in magnetic flux density can reduce the iron loss and copper loss of the motor caused by the iron core.
[0007] According to some embodiments of the present utility model, the tooth body and the yoke define a winding groove, in which the winding of the stator is arranged, and the shoulder extends along the edge of the winding in a direction away from the winding.
[0008] According to some embodiments of the present invention, the second connecting surface is a curved surface.
[0009] According to some embodiments of the present invention, the second connecting surface is an arc surface.
[0010] According to some embodiments of the present invention, the center of the cross section of the arc surface coincides with the center of the outer circle of the stator core.
[0011] According to some embodiments of the present invention, the second connecting surface is a plane.
[0012] According to some embodiments of the present invention, two yokes are provided, and the two yokes are correspondingly arranged on both sides of the tooth body.
[0013] According to some embodiments of the present invention, the tooth portion further includes a tooth shoe, the tooth portion includes a tooth body and a tooth shoe, the tooth shoe is arranged at the other end of the tooth body, and along the circumference of the stator, the tooth shoe extends away from the tooth body.
[0014] According to some embodiments of the present invention, two tooth shoes are provided, and the two tooth shoes are correspondingly arranged on both sides of the tooth body, and the tooth shoes are arranged opposite to the corresponding yoke.
[0015] According to some embodiments of the present invention, a process groove is provided on a side of the yoke portion facing away from the tooth portion.
[0016] The stator according to the embodiment of the second aspect of the utility model includes a stator core, which includes a plurality of segmented stator cores, which are arranged along the circumference of the stator, and the segmented stator core includes a plurality of segmented stator punching sheets described in any of the above embodiments which are stacked.
[0017] The motor according to the third aspect of the present invention comprises the stator as described in the above embodiment.
[0018] The motor according to the embodiment of the utility model has at least the following beneficial effects: the stator adopted by the motor of the utility model has an improved yoke width in the bottleneck area of the stator core that affects the magnetic conductivity, that is, the width of the shoulder is increased, and then the width of the bottleneck area of the yoke that affects the magnetic conductivity is increased, so that the width of the yoke of the stator core remains basically consistent, thereby increasing the cross-sectional area of the magnetic field magnetic line channel of the yoke, so that the magnetic resistance of the magnetic field of the yoke is reduced, thereby increasing the torque output; due to the increase in the cross-sectional area of the magnetic field magnetic line channel, the magnetic flux density is reduced, the saturation degree is reduced, and the nonlinear characteristics of the yoke are reduced, thereby correspondingly improving the torque control characteristics, and the reduction in the magnetic flux density can reduce the iron loss and copper loss of the motor caused by the core.
[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:
[0021] Figure 1 This is a schematic structural diagram of a divided stator punching sheet according to an embodiment of the utility model;
[0022] Figure 2 for Figure 1 A partial enlarged view of the middle A;
[0023] Figure 3 It is a schematic diagram of winding of the block stator punching of the utility model;
[0024] Figure 4 This is a schematic structural diagram of a stator core of a stator in one embodiment of the utility model;
[0025] Figure 5 A schematic diagram of the magnetic force line distribution of a segmented stator punching sheet according to an embodiment of the utility model;
[0026] Figure 6 The figure is a schematic diagram of the magnetic field line distribution of the segmented stator punching sheets in the prior art.
[0027] Figure Number:
[0028] Segmented stator punching sheet 100, tooth portion 101, tooth body 102, tooth shoe 103, first tooth shoe 104, second tooth shoe 105, yoke 106, winding groove 107, process groove 108, connecting portion 109, first connecting surface 110, shoulder 111, second connecting surface 112;
[0029] Stator core 200, block stator core 201, winding 202; DETAILED DESCRIPTION
[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0031] In the description of the present invention, it should be understood that the descriptions involving orientation, such as left, right, etc., the orientation or positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.
[0032] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0034] In the prior art, most permanent magnet synchronous servo motors use block stator technology, which means that the stator of the motor is assembled from multiple block stator cores, and the block stator core is stacked by multiple block stator punching sheets. The use of block stator punching sheets has low requirements on high-pressure punching machines and molds, high material utilization, less waste, and effectively reduces material costs.
[0035] Taking the commonly used stator 12 slot rotor 10 pole pole slot selection as an example, the stator is composed of 12 blocks of stator cores. After the teeth of each block stator core are wound, the 12 blocks of stator cores are combined to form the entire stator.
[0036] The existing segmented stator solutions often adopt right-angle segmented stators. Right angle means that the teeth and yoke of the segmented stator are arranged at right angles. The right-angle segmented stator can arrange the winding more conveniently and improve the space utilization of the winding in the winding slot.
[0037] The side of the yoke of the right-angle segmented stator facing the tooth part is flat. Due to the limitations of the right-angle segmented stator's own structure, the width of the magnetic conductive area of the yoke gradually narrows from the end connected to the tooth part to the end of the yoke away from the tooth part. A too narrow yoke will form a bottleneck area of magnetic conductivity, resulting in local magnetic field saturation, reducing the torque output of the motor, increasing the iron loss and copper loss of the motor, and reducing the linearity of torque control.
[0038] To this end, the utility model proposes a segmented stator punching sheet 100 to solve the problem that the width of the yoke 106 of the right-angle segmented stator gradually narrows in the direction away from the tooth portion 101 .
[0039] Reference Figure 1 , Figure 2 The first aspect of the utility model proposes a block stator punching sheet 100, which is used for the stator. It can be understood that the stator core 200 is a component of the stator, wherein the stator core 200 is formed by a plurality of block stator cores 201 arranged along the circumferential direction of the stator, and the block stator core 201 is formed by stacking a plurality of block stator punching sheets 100. The use of the block stator punching sheets 100 can reduce the difficulty of stator processing and improve the slot fill rate of the motor. The segmented stator punching sheet 100 includes a tooth portion 101 and a yoke portion 106. The tooth portion 101 includes a tooth body 102. The tooth body 102 has a surface on both sides along the circumference of the stator. The yoke portion 106 is arranged at one end of the tooth body 102. In the same direction of the stator, the yoke portion 106 extends in a direction away from the tooth body 102. In this embodiment, two yoke portions 106 are provided, and the two yoke portions 106 are correspondingly arranged on both sides of the tooth body 102. The segmented stator punching sheet 100 can be made of a material with good electromagnetic properties, high magnetic permeability, and small residual magnetism, such as silicon steel sheets, ferrites, aluminum-nickel-cobalt alloys, etc. The segmented stator punching sheet 100 is the basic component of the stator core 200. When manufacturing the stator core 200, it is only necessary to process a plurality of segmented stator punching sheets 100, and then stack and assemble the plurality of segmented stator punching sheets 100 into a segmented stator core 201, and then assemble the plurality of segmented stator cores 201 into a complete stator core 200. The stator core 200 can be wound in an inner winding manner using a winding machine after the plurality of segmented stator cores 201 are assembled to form a stator winding 202, or can be formed into a coil in an outer winding manner before the segmented stator cores 201 are assembled, and the coils are further connected into a stator winding 202 after the segmented stator cores 201 are assembled. Compared with processing a complete stator, the difficulty of processing the segmented stator punching sheets 100 is reduced, thereby reducing the production cost, and the automated production of the stator can be realized through an automated production line.
[0040] like Figure 1As shown, the yoke 106 includes a connecting portion 109 and a shoulder 111, one end of the connecting portion 109 is connected to the tooth body 102, the shoulder 111 is located at the other end of the connecting portion 109 away from the tooth body 102, and is connected to the connecting portion 109, the connecting portion 109 and the shoulder 111 are an integral structure, and the connecting portion 109 has a first connecting surface 110 on the side facing the tooth body 102, the first connecting surface 110 is set as a plane, and the first connecting surface 110 and the surfaces of the tooth body 102 on both sides along the stator circumference are arranged at right angles. In other words, referring to Figure 1 , the stator core is cut along the radial direction of the stator core 200, the cross section of the tooth body 102 is rectangular, the cross section of the connecting portion 109 is trapezoidal, the cross section of the connecting portion 109 is connected to the cross section of the tooth body 102, and the angle formed by one side of the cross section of the connecting portion 109 and one side of the cross section of the tooth body 102 is a right angle, that is, Figure 1 The angle shown at B is a right angle. It can be understood that the first connecting surface 110 and the surface of the tooth body 102 on both sides of the stator circumferential direction are arranged at a right angle, which can facilitate the arrangement of windings, improve the space utilization rate of the windings in the winding slots 107, and appropriately improve the slot fill rate of the winding slots 107, reduce the air gap area, thereby reducing magnetic resistance, improving the magnetic field strength of the motor, and correspondingly improving the output power and efficiency. At the same time, the high slot fill rate helps to reduce the use of copper wires, silicon steel sheets, ferromagnetic materials, etc., increase material utilization, and reduce costs.
[0041] Reference Figure 1 , Figure 2 The shoulder 111 has a second connecting surface 112, and the first connecting surface 110 is connected to the second connecting surface 112 and smoothly transitions. Along the direction away from the tooth body 102, the spacing d between the second connecting surface 112 and the plane where the first connecting surface 110 is located gradually increases, thereby increasing the width of the shoulder 111 away from the tooth body 102, so that the width of the magnetic conductive area of the yoke 106 of the segmented stator punching 100 is basically consistent, thereby eliminating the bottleneck area affecting the magnetic conductivity, increasing the cross-sectional area of the magnetic field magnetic line channel of the segmented stator yoke 106, so that the magnetic resistance of the magnetic field of the yoke 106 is reduced, thereby increasing the torque output; due to the increase in the cross-sectional area of the magnetic field magnetic line channel, the magnetic flux density is reduced, the saturation degree is reduced, and the nonlinear characteristics of the yoke 106 are reduced, thereby correspondingly improving the torque control characteristics, and the reduction in magnetic flux density can reduce the iron loss and copper loss of the motor caused by the iron core.
[0042] Reference Figure 3In some embodiments, a winding groove 107 is defined between the yoke 106 and the tooth body 102. When a plurality of segmented stator laminations 100 form a segmented stator core 201, the stator winding 202 is wound in the winding groove 107, wherein the shoulder 111 extends along the edge of the winding 202 in a direction away from the winding 202, that is, no winding is set in the area of the winding groove 107 below the shoulder 111, and the winding of the segmented stator core 201 assembled by the segmented stator laminations 100 of this embodiment can meet the requirements of the slot fill rate. Therefore, the segmented stator laminations 100 of this embodiment can eliminate the bottleneck area affecting the magnetic conductivity, increase the cross-sectional area of the magnetic field magnetic line channel of the segmented stator yoke 106, reduce the magnetic resistance of the magnetic field of the yoke 106, thereby increasing the torque output, and will not reduce the magnetic field strength of the motor using the segmented stator laminations 100, so as not to affect the output power and efficiency of the motor, thereby ensuring the performance of the motor.
[0043] Reference Figure 1 , Figure 2 In some embodiments, the second connecting surface 112 is configured as an arc surface. The use of the arc surface can better utilize the space utilization of the yoke 106, improve the magnetic conductivity and electrical conductivity of the stator, and thus improve the output power and efficiency of the motor.
[0044] Reference Figure 1 , Figure 2 In some embodiments, when the second connecting surface 112 is an arc surface, the center of the cross section of the arc surface coincides with the center of the outer circle of the stator core 200, that is, the shoulder 111 is in a circular ring shape, and the inner and outer sides of the cross section of the shoulder 111 are concentric with the outer circle of the stator core 200, thereby increasing the width of the shoulder 111 away from the end of the tooth portion 101, so that the width of the magnetic conductive area of the yoke 106 of the segmented stator punching sheet 100 remains basically consistent, thereby eliminating the bottleneck area affecting the magnetic conductivity, increasing the cross-sectional area of the magnetic field magnetic line channel of the segmented stator yoke 106, and reducing the magnetic resistance of the magnetic field of the yoke 106, thereby increasing the torque output, and due to the increase in the cross-sectional area of the magnetic field magnetic line channel, the magnetic flux density is reduced, the saturation degree is reduced, and the nonlinear characteristics of the yoke 106 are reduced, thereby correspondingly improving the torque control characteristics, and the reduction in magnetic flux density can reduce the iron loss and copper loss of the motor caused by the core.
[0045] It can be understood that, in some embodiments, the second connecting surface 112 can also be set to a plane and a curved surface of other shapes. The curved surfaces of other shapes can be a curved surface with a parabolic cross-section, a curved surface with an involute cross-section, etc. When the second connecting surface 112 adopts a plane or a curved surface of other shapes, it can also increase the width of the magnetic conductive area of the shoulder 111 and the cross-sectional area of the magnetic field magnetic line channel, so that the magnetic resistance of the magnetic field of the yoke 106 is reduced, thereby increasing the torque output, improving the torque control characteristics, and reducing the iron loss and copper loss of the motor caused by the iron core.
[0046] Reference Figure 1 In some embodiments, the tooth portion 101 includes a tooth body 102 and a tooth shoe 103, the yoke 106 is arranged at one end of the tooth body 102, and the tooth shoe 103 is arranged at the other end of the tooth body 102, and the tooth shoe 103 extends in a direction away from the tooth body 102. In this embodiment, two yokes 106 are provided, and two tooth shoes 103 are correspondingly provided, namely, a first tooth shoe 104 and a second tooth shoe 105, wherein the first tooth shoe 104 is arranged on a side of the tooth body 102 away from the yoke 106, and the second tooth shoe 105 is arranged on a side of the tooth portion 101 away from the first tooth shoe 104, and the first tooth shoe 104 and the second tooth shoe 105 are arranged relative to the yoke 106 in a one-to-one correspondence. The first tooth shoe 104 , the second tooth shoe 105 , the tooth body 102 and the yoke 106 cooperate to form a winding slot 107 , and the first tooth shoe 104 and the second tooth shoe 105 limit the segmented stator winding 202 to ensure that the stator winding 202 is stably wound in the winding slot 107 .
[0047] Reference Figure 1 In some embodiments, a process groove 108 is provided on the side of the yoke 106 facing away from the tooth portion 101. Through the cooperation between the process groove 108 and the end face of the tooth portion 101, the assembly tool can be conveniently used to position the segmented stator punching sheet 100, so as to facilitate the assembly of the segmented stator and the winding of the winding 202, thereby improving the assembly efficiency of the segmented stator.
[0048] Reference Figure 5 , Figure 6 , Figure 5 The figure shows the distribution of magnetic lines of force in the stator core 200 when the winding 202 of the stator using the segmented stator punching sheet 100 of the embodiment of the utility model is powered on. Figure 6 The figure shows the distribution of magnetic lines of force in the stator core 200 when the winding 202 of the stator using the segmented stator laminations 100 of the prior art is energized.
[0049] Reference Figure 6 , Figure 6The width of the shoulder 111 of the segmented stator punching sheet 100 of the prior art gradually narrows, resulting in a gradually reduced cross-sectional area of the magnetic field magnetic line of force channel of the shoulder 111. As a result, the first magnetic line of force 1 and the second magnetic line of force 2 in the middle position of the shoulder 111 of the segmented stator punching sheet 100 can be connected with the corresponding magnetic lines of force of the adjacent segmented stator punching sheet 100, while the third magnetic line of force 3 located on the side of the shoulder 111 is cut off by the narrowed shoulder 111 and cannot be connected with the corresponding magnetic lines of force of the adjacent segmented stator punching sheet 100, thereby forming a magnetic bottleneck area at the shoulder 111, which increases the magnetic resistance of the magnetic field of the shoulder 111, resulting in local magnetic field saturation, reduced torque output, increased iron loss and copper loss, and reduced torque control linearity.
[0050] like Figure 5 As shown, the width of the shoulder 111 of the segmented stator punching sheet 100 used in this embodiment is increased, and the cross-sectional area of the corresponding magnetic field magnetic line of force channel is increased. Therefore, the first magnetic line of force 1, the second magnetic line of force 2 and the third magnetic line of force 3 of a segmented stator shown in the figure can be connected with the corresponding magnetic lines of force of the adjacent segmented stators, so that the magnetic resistance of the magnetic field of the shoulder 111 is reduced, thereby increasing the torque output; due to the increase in the cross-sectional area of the magnetic field magnetic line of force channel, the magnetic flux density is reduced, the saturation degree is reduced, and the nonlinear characteristics of the yoke 106 are reduced, thereby improving the torque control characteristics, and the reduction in magnetic flux density can reduce iron loss.
[0051] Reference Figure 4 The stator proposed in the embodiment of the second aspect of the utility model includes a stator core 200, and the stator core 200 includes a plurality of block stator cores 201. The block stator core 201 includes a plurality of stacked block stator punching sheets 100 of any of the above-mentioned embodiments, and the plurality of block stator cores 201 are arranged along the circumference of the stator core 200.
[0052] Specifically, the stator includes a plurality of segmented stators, each segmented stator includes a segmented stator core 201 and a winding 202, the winding 202 is wound in the winding slot 107 of the segmented stator core 201, and the plurality of segmented stators are arranged along the circumference of the stator to form an annular stator structure, the segmented stator core 201 includes a plurality of segmented stator punchings 100, and the plurality of segmented stator punchings 100 are stacked, and the segmented stator punchings 100 adopt the segmented stator punchings 100 proposed in any of the above-mentioned embodiments.
[0053] The structure and principle of the stator of the present utility model are described in detail below in conjunction with the specific embodiments disclosed in the accompanying drawings.
[0054] Reference Figures 1 to 5In the specific embodiment of the stator disclosed in the figure, the segmented stator punching sheet 100 includes a tooth portion 101 and two yoke portions 106, the tooth portion 101 includes a tooth body 102 and a tooth shoe 103, the tooth body 102 has a surface on both sides along the circumference of the stator, the yoke portion 106 is arranged at one end of the tooth body 102, and along the same direction of the stator, the yoke portion 106 extends in a direction away from the tooth body 102, the two yoke portions 106 are correspondingly arranged on both sides of the tooth body 102, the tooth shoe 103 is arranged at the other end of the tooth body opposite to the yoke portion 106, along the circumference of the stator, the tooth shoe 103 extends in a direction away from the tooth body 102, the two tooth shoes 103 are correspondingly arranged on both sides of the tooth body 102, and the tooth shoe 103 and the yoke portion 106 are arranged opposite to each other.
[0055] Reference Figure 1 The yoke 106 includes a connecting portion 109 and a shoulder 111. One end of the connecting portion 109 is connected to the tooth body 102. The shoulder 111 is located at the other end of the connecting portion 109 away from the tooth body 102 and is connected to the connecting portion 109. The connecting portion 109 and the shoulder 111 are an integrated structure. The connecting portion 109 has a first connecting surface 110 on the side facing the tooth body 102. The first connecting surface 110 is set as a plane. The first connecting surface 110 and the surfaces of the tooth body 102 on both sides along the stator circumference are arranged at right angles. In other words, Figure 1 As shown, the stator core is cut along the radial direction of the stator core 200, the cross section of the tooth body 102 is rectangular, the cross section of the connecting portion 109 is trapezoidal, the cross section of the connecting portion 109 is connected to the cross section of the tooth body 102, and the angle formed by one side of the cross section of the connecting portion 109 and one side of the cross section of the tooth body 102 is a right angle, that is, Figure 1 The angle shown at B is a right angle.
[0056] Reference Figure 1 , Figure 2 The shoulder 111 has a second connection surface 112, the first connection surface 110 is connected to the second connection surface 112, and the transition is smooth. The second connection surface 112 is set as an arc surface, and the distance d between the second connection surface 112 and the plane where the first connection surface 110 is located gradually increases in the direction away from the tooth body 102. In addition, the center of the cross section of the arc surface coincides with the center of the outer circle of the stator core 200, that is, the shoulder 111 adopts a circular ring shape, and the inner and outer sides of the cross section of the shoulder 111 are concentric with the outer circle of the stator core 200.
[0057] Reference Figure 3 A winding groove 107 is defined between the yoke 106 and the tooth body 102 and the tooth shoe 103. When a plurality of segmented stator punching sheets 100 form a segmented stator core 201, the stator winding 202 is wound in the winding groove 107, wherein the shoulder 111 extends along the edge of the winding 202 in a direction away from the winding 202, that is, no winding is set in the area of the winding groove 107 below the shoulder 111.
[0058] Reference Figure 1 A process groove 108 is provided on the side of the yoke 106 facing away from the tooth portion 101. Through the cooperation between the process groove 108 and the end face of the tooth portion 101, the assembly tool can be conveniently used to position the segmented stator punching sheet 100, so as to facilitate the assembly of the segmented stator and the winding of the winding 202, thereby improving the assembly efficiency of the segmented stator.
[0059] like Figure 5 As shown, the width of the shoulder 111 of the segmented stator punching sheet 100 used in this embodiment is increased, and the cross-sectional area of the corresponding magnetic field magnetic line of force channel is increased. Therefore, the first magnetic line of force 1, the second magnetic line of force 2 and the third magnetic line of force 3 of a segmented stator shown in the figure can be connected with the corresponding magnetic lines of force of the adjacent segmented stators, so that the magnetic resistance of the magnetic field of the shoulder 111 is reduced, thereby increasing the torque output; due to the increase in the cross-sectional area of the magnetic field magnetic line of force channel, the magnetic flux density is reduced, the saturation degree is reduced, and the nonlinear characteristics of the yoke 106 are reduced, thereby improving the torque control characteristics, and the reduction in magnetic flux density can reduce iron loss.
[0060] Therefore, the width of the bottleneck part of the yoke 106 of the stator at the shoulder 111 is improved and increased, which increases the cross-sectional area of the magnetic field magnetic line channel, reduces the magnetic resistance of this part of the magnetic field, and thus increases the torque output; since the magnetic flux density is reduced and the saturation level is reduced, the nonlinear characteristics of the yoke 106 are reduced, thereby improving the torque control characteristics, and the reduction in magnetic flux density can reduce the iron loss and copper loss of the motor caused by the iron core.
[0061] The motor proposed in the third embodiment of the utility model includes the stator proposed in the above embodiment, and the width of the bottleneck part of the yoke 106 of the stator at the shoulder 111 is improved and increased, thereby increasing the cross-sectional area of the magnetic field magnetic line channel, so that the magnetic resistance of this part of the magnetic field is reduced, thereby increasing the torque output; due to the reduction of magnetic flux density and the reduction of saturation, the nonlinear characteristics of the yoke 106 are reduced, thereby improving the torque control characteristics, and the reduction of magnetic flux density can reduce the iron loss and copper loss of the motor caused by the iron core.
[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0063] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A block stator punching sheet, used for a stator, characterized in that: include: Tooth, including tooth body; A yoke portion is provided at one end of the tooth body, and extends in a direction away from the tooth body along the circumference of the stator. The yoke portion includes a connecting portion and a shoulder portion, wherein the connecting portion is connected to the tooth body, and the shoulder portion is located at the end of the connecting portion away from the tooth body. The connecting portion has a first connecting surface on the side facing the tooth body, and the first connecting surface is a plane. The first connecting surface and the wall surfaces on both sides of the tooth body along the circumference of the stator are arranged at a right angle. The shoulder portion has a second connecting surface, and the first connecting surface is connected to the second connecting surface. Along the direction away from the tooth body, the distance between the second connecting surface and the plane where the first connecting surface is located gradually increases.
2. The segmented stator lamination according to claim 1, characterized in that: The tooth body and the yoke define a winding groove, the winding groove is used to arrange the winding of the stator, and the shoulder extends along the edge of the winding in a direction away from the winding.
3. The segmented stator lamination according to claim 1 or 2, characterized in that: The second connecting surface is a curved surface.
4. The segmented stator lamination according to claim 3, characterized in that: The second connecting surface is an arc surface.
5. The segmented stator lamination according to claim 4, characterized in that: The center of the cross section of the arc surface coincides with the center of the outer circle of the stator.
6. The segmented stator lamination according to claim 1 or 2, characterized in that: The second connecting surface is a plane.
7. The segmented stator lamination according to claim 1 or 2, characterized in that: The yoke parts are provided with two, and the two yoke parts are correspondingly arranged on both sides of the tooth body.
8. The segmented stator lamination according to claim 7, characterized in that: The tooth portion further includes a tooth shoe, which is disposed at the other end of the tooth body and extends in a direction away from the tooth body along the circumferential direction of the stator.
9. The segmented stator lamination according to claim 8, characterized in that: The tooth shoes are provided with two, and the two tooth shoes are correspondingly arranged at two sides of the tooth body, and the tooth shoes are arranged opposite to the corresponding yoke.
10. The segmented stator lamination according to claim 1 or 2, characterized in that: A process groove is provided on a side of the yoke portion away from the tooth portion.
11. A stator, characterized in that: It comprises a stator core, wherein the stator core comprises a plurality of segmented stator cores, the plurality of segmented stator cores are arranged along the circumference of the stator, and the segmented stator core comprises a plurality of segmented stator punching sheets as claimed in any one of claims 1 to 10 which are stacked.
12. A motor, characterized in that: Comprising the stator as claimed in claim 10.