Iron core punching sheet, rotor assembly and motor

Abstract

The invention provides an iron core punching sheet, a rotor assembly and a motor. The iron core punching sheet comprises an annular body and a plurality of tooth yokes, and the tooth yokes are evenly arranged on the outer wall or the inner wall of the body in the circumferential direction of the body. A wire slot is formed between every two adjacent tooth yokes and is used for accommodating a winding; one end of the tooth root part of the tooth yoke is arranged on the body, and the other end of the tooth root part of the tooth yoke is connected with the tooth tip part of the tooth yoke; the tooth top parts are symmetrically arranged in the radial direction of the body and are provided with bulges in the circumferential direction of the body; the tooth tip part comprises a first structural body, and the plane where the first structural body is located and the plane where the body is located are arranged in a crossed mode. According to the iron core, the tooth tip parts of the tooth yokes and the body are arranged in a crossed manner, so that the axial end of the winding is limited, an insulation structure does not need to be additionally arranged, and the phenomenon that an insulation structure on a traditional iron core is prone to damage is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of direct current motors, and in particular relates to an iron core punching sheet, a rotor assembly and a motor. Background Art

[0002] A DC motor is an electric motor that converts DC electrical energy into mechanical energy or a rotating motor that converts mechanical energy into DC electrical energy. It is a motor that can realize mutual conversion between DC electrical energy and mechanical energy. When it operates as a motor, it is a DC motor that converts electrical energy into mechanical energy. When it operates as a generator, it is a DC generator that converts mechanical energy into electrical energy.

[0003] DC motors are widely used in electric traction due to their good speed regulation performance. DC generators are widely used in electric power generation due to their ease of use, reliable operation, good potential waveform and low electromagnetic interference.

[0004] DC motors are divided into three categories according to the excitation method: permanent magnet, externally excited and self-excited. Self-excitation is further divided into shunt excitation, series excitation and compound excitation. The structure is mainly composed of iron core, shaft, shell, etc.; its basic electromagnetic performance is determined by the matching excitation winding of the stator and rotor cores, and the iron core is generally stamped and laminated by metal sheets, which requires a long R&D and mold opening cycle and a large amount of investment.

[0005] Starting motors are developing rapidly with the improvement of social economy and people's living standards. The development of starting motors requires motor rotors to have high reliability, low cost, high efficiency, easy production, and simple model change. Most traditional starting motor rotors use single-flying fork winding machines, and the distributed windings have defects such as large head size, large amount of enameled wire, poor reliability, low efficiency, long model change time, complex winding equipment, high requirements for production personnel, and difficulty in automation. In particular, the iron core in the motor needs to be insulated with an insulating structure, and the insulating structure has the problem of poor strength, which causes a lot of damage during the winding and production process, increasing the production cost.

[0006] Therefore, a reasonable, simple, multi-purpose and universal design scheme for core punching sheets has always been the unremitting pursuit of engineers. Summary of the invention

[0007] Therefore, the present application provides an iron core punching sheet, a rotor assembly and a motor, which can solve the problem of poor strength and easy damage of the insulation structure on the iron core in the prior art.

[0008] In order to solve the above problems, the present application provides a core punching sheet, comprising:

[0009] An annular body and a tooth yoke, wherein the tooth yoke is provided in plurality and is evenly arranged on the outer wall or the inner wall of the body along the circumference of the body; wire grooves are formed between adjacent tooth yokes for accommodating windings;

[0010] One end of the tooth root of the tooth yoke is arranged on the body, and the other end is connected to the tooth tip of the tooth yoke; the tooth tip is symmetrically arranged with respect to the radial direction of the body, and is provided with a protrusion along the circumferential direction of the body;

[0011] The tooth tip portion includes a first structure, and a surface where the first structure is located is cross-arranged with a surface where the main body is located.

[0012] In some embodiments,

[0013] The surface where the first structure is located and the surface where the main body is located are arranged perpendicular to each other.

[0014] In some embodiments,

[0015] The tooth tip portion further includes a second structure, and a surface where the second structure is located is in the same plane as a surface where the main body is located.

[0016] In some embodiments,

[0017] Along the circumferential direction of the body, the width of the tooth tip is set to W2, and the width of the tooth root is set to W1; in the radial direction of the body, the length of the tooth tip is set to H2, and the length of the tooth root is set to H1, satisfying W2>4×W1, H1>2×H2.

[0018] In some embodiments,

[0019] The side wall of the main body connected to the tooth yoke is formed by a plurality of straight line segment sides connected in sequence, one end of the tooth root is arranged on the straight line segment side, and both are arranged radially symmetrically with respect to the main body; when the tooth tip is the second structure, the protrusion is arranged close to the side of the main body and parallel to the straight line segment side.

[0020] In some embodiments,

[0021] The length of the straight line segment is set to W3, satisfying W3≥4 / 5×W2.

[0022] According to another aspect of the present application, a rotor assembly is provided, including a rotor core, wherein the rotor core is formed by stacking the core punching sheets as described above.

[0023] In some embodiments,

[0024] When the tooth tip is in the first structure, the core punching sheet is set as a bent punching sheet; when the tooth tip is in the second structure, the core punching sheet is set as a flat punching sheet; the rotor core is composed of a plurality of the flat punching sheets and at least one bent punching sheet stacked together, and a plurality of the flat punching sheets stacked together form a flat punching sheet group; the bent punching sheet is arranged on one side of the flat punching sheet group, and the tooth tip of the bent punching sheet is located in a direction away from the stacked flat punching sheets.

[0025] In some embodiments,

[0026] The rotor assembly also includes an insulating layer, which covers the rotor core; the insulating layer is arranged on the surface of the rotor core by injection molding or spraying.

[0027] According to another aspect of the present application, a motor is provided, comprising the core punching sheet as described above or the rotor assembly as described above.

[0028] The present application provides an iron core punching sheet, comprising: an annular body and a tooth yoke, wherein a plurality of the tooth yokes are provided and are evenly arranged on the outer wall or the inner wall of the body along the circumference of the body; wire grooves are formed between adjacent tooth yokes for accommodating windings; one end of the tooth root of the tooth yoke is provided on the body, and the other end is connected to the tooth tip of the tooth yoke; the tooth tip is symmetrically arranged with respect to the radial direction of the body, and is provided with a protrusion along the circumferential direction of the body; the tooth tip comprises a first structure, and the surface where the first structure is located is cross-arranged with the surface where the body is located.

[0029] This application has the following beneficial effects:

[0030] By cross-setting the tooth tip of the tooth yoke and the body, the axial end of the winding is limited, and there is no need to set up an additional insulation structure, thus avoiding the phenomenon that the insulation structure on the traditional iron core is easily damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the implementation methods or the prior art descriptions. The drawings described below are merely exemplary, and for those of ordinary skill in the art, other implementation drawings can be derived from the provided drawings without creative work.

[0032] Figure 1 A schematic diagram of the structure of the core punching sheet of the embodiment of the present application;

[0033] Figure 2 For the embodiment of this application Figure 1 Side view of

[0034] Figure 3For the embodiment of this application Figure 1 Middle partial enlarged picture;

[0035] Figure 4 Another schematic diagram of the structure of the core punching sheet of the embodiment of the present application;

[0036] Figure 5 For the embodiment of this application Figure 4 A partial enlarged view of

[0037] Figure 6 For the embodiment of this application Figure 5 Dimensional diagram of

[0038] Figure 7 Schematic diagram of the structure of the rotor core of an embodiment of the present application.

[0039] The reference numerals are:

[0040] 1. Main body; 11. Side of straight line segment;

[0041] 2. tooth yoke; 21. tooth root; 22. second structure; 23. first structure. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0046] See also Figures 1 to 7 As shown, according to an embodiment of the present application, a core punching sheet includes:

[0047] An annular body 1 and a gear yoke 2, wherein a plurality of the gear yokes 2 are provided and are evenly arranged on the outer wall or the inner wall of the body 1 along the circumference of the body 1; wire grooves are formed between adjacent gear yokes 2 for accommodating windings;

[0048] One end of the tooth root portion 21 of the tooth yoke 2 is arranged on the body 1, and the other end is connected to the tooth tip portion of the tooth yoke 2; the tooth tip portion is symmetrically arranged with respect to the radial direction of the body 1, and is provided with a protrusion along the circumferential direction of the body 1;

[0049] The tooth tip portion includes a first structure 23 , and a surface where the first structure 23 is located is cross-arranged with a surface where the body 1 is located.

[0050] The present application realizes the axial end limitation of the winding by cross-setting the tooth tip of the tooth yoke 2 and the main body 1, and does not need to provide an additional insulation structure, thus avoiding the phenomenon that the insulation structure on the traditional iron core is easily damaged.

[0051] The tooth tip of the tooth yoke 2 and the body 1 are bent relative to each other. When the first structure 23 is located at the axial end of the iron core, the first structure 23 can limit the end of the winding; therefore, in an iron core with an insulating structure, the first structure 23 can be embedded in the insulating structure to provide shear stress for the insulating structure and increase the strength of the insulating structure. The above-mentioned insulating structure is wound with a winding, and the insulating structure plays an insulating role to prevent the winding from directly contacting the iron core.

[0052] The core punching sheet can be used for the rotor core or the stator core. For the stator core, the tooth yoke 2 is arranged on the inner wall of the body 1, while for the core punching sheet of the rotor core, the tooth yoke 2 is arranged on the outer wall of the body 1.

[0053] Since the iron core punching sheet of the present application is provided with a bent tooth tip portion, the winding can be limited, so there is no need to provide an additional insulating structure to separate the winding and the iron core, such as directly spraying an insulating layer on the iron core, which has better structural stability; in addition, since the insulating structure can be reduced, the production cost is reduced, and the winding can be closer to the iron core, reducing the total length of the winding, making the winding simpler and enabling automated operation.

[0054] In some embodiments,

[0055] The surface where the first structure 23 is located and the surface where the main body 1 is located are perpendicular to each other.

[0056] The surface where the first structure 23 is located is perpendicular to the surface where the main body 1 is located, which has the best limiting effect and is convenient for the winding of the winding. Specifically, if the surface where the first structure is located is not perpendicular to the surface where the main body 1 is located, when the enameled wire is automatically wound to form the winding, the winding is prone to wire derailment, and the efficiency is low.

[0057] In some embodiments,

[0058] The tooth tip portion further includes a second structure 22 , and the surface where the second structure 22 is located is in the same plane as the surface where the body 1 is located.

[0059] The tooth tip portion can also be set as a second structure 22, and the surface where the second structure 22 is located is the same plane as the surface where the body 1 is located, so that the core punching sheet has two different structural forms, one is that the tooth tip portion is the first structure 23, and the other is that the tooth tip portion is the second structure 22. Since the second structure 22 and the body 1 are arranged in the same plane, the first structure 23 can be obtained by bending the second structure 22, or the second structure 22 can be obtained by bending the first structure 23 to the surface where the body 1 is located. These two different structural forms of the core punching sheets are obtained by bending and deforming each other, so when the whole is made, the same mold can be used. For example, first all are stamped to make the core punching sheet containing the second structure 22, and then only the tooth tip of some of the core punching sheets is bent to obtain the core punching sheet of the first structure 23, and the process is simple.

[0060] When the first structure 23 is bent by the second structure 22, the main change is from a flat design to a vertical bending, and the bending angle is 90°. To facilitate bending, a semicircular hole is set on the side of the second structure 22 facing the main body 1, and the hole diameter is R2. To make room for bending, a reasonable design scheme is R2≤1 / 4 of the circumferential width of the tooth root 21.

[0061] In some embodiments,

[0062] Along the circumference of the main body 1, the width of the tooth tip is set to W2, and the width of the tooth root 21 is set to W1; in the radial direction of the main body 1, the length of the tooth tip is set to H2, and the length of the tooth root 21 is set to H1, satisfying W2>4×W1, H1>2×H2.

[0063] The size of the tooth tip is limited as described above, so that the volume of the wire slot is maximized, and when winding the winding, the number of turns of the wire diameter is increased, thereby increasing the slot fill rate of the tooth yoke 2. In this way, the number of turns of the wire diameter of the winding can be increased without increasing the cost of the core, thereby optimizing the performance of the motor.

[0064] In some embodiments,

[0065] The side wall of the main body 1 connected to the tooth yoke 2 is formed by a plurality of straight segment side edges 11 connected in sequence, one end of the tooth root portion 21 is arranged on the straight segment side edge 11, and both are radially symmetrically arranged with respect to the main body 1; when the tooth tip portion is the second structure 22, the protrusion is arranged close to the side edge of the main body 1 and parallel to the straight segment side edge 11.

[0066] The side wall connecting the tooth yoke 2 is formed by connecting a plurality of straight segment sides 11 in sequence, and the tooth yoke 2 and the straight segment side 11 are coaxially symmetrically arranged. In particular, when the tooth tip is the second structure 22, the side of the protrusion close to the main body 1 is parallel to the straight segment side 11, thereby maximizing the space of the wire slot and facilitating the winding of the coil.

[0067] In some embodiments,

[0068] The length of the straight line segment is set to W3, satisfying W3≥4 / 5×W2.

[0069] For the iron core punching sheet whose tooth tip is the second structure 22, the tooth root 21 is the winding area of ​​the excitation winding, and the magnetic field lines of the excitation winding radiate to the second structure 22 and the side 11 of the straight segment. Through electromagnetic simulation comparison, the main tooth yoke 2 scheme W2>4×W1, W3≥4 / 5×W2, H1>2×H2, R1<1 / 3×H2; R1 is the fillet radius of the side of the protrusion away from the main body 1; matching the main magnetic core scheme d2>1 / 2D, d1>1 / 4D or d1>1 / 2d2, wherein d1 is the inner diameter of the main body 1, d2 is the outer diameter of the main body 1, and D is the outer diameter of the iron core punching sheet. This iron core punching sheet can be used for multi-pole odd and even number designs of 4 to 18 teeth; when designed as an odd number, the function of the motor can be effectively realized, and one of the teeth can be designed as a power output for power generation or as an inductance output for harmonics...etc.; effectively realizing the multi-purpose and universal design.

[0070] According to another aspect of the present application, a rotor assembly is provided, including a rotor core, wherein the rotor core is formed by stacking the core punching sheets as described above.

[0071] In some embodiments,

[0072] When the tooth tip is the first structure 23, the core punching sheet is set as a bent punching sheet; when the tooth tip is the second structure 22, the core punching sheet is set as a flat punching sheet; the rotor core is composed of a plurality of the flat punching sheets and at least one bent punching sheet stacked together, and a plurality of the flat punching sheets stacked together form a flat punching sheet group; the bent punching sheet is arranged on one side of the flat punching sheet group, and the tooth tip of the bent punching sheet is located in a direction away from the stacked flat punching sheets.

[0073] By arranging bent punching sheets on the end faces of the flat punching sheet group, the magnetic conductive cross-sectional area of ​​the slot can be effectively increased, the magnetic induction can be enhanced, the magnetic flux can be concentrated, and the eddy current loss of the slot can be reduced, thereby improving the energy efficiency of the motor and reducing the temperature rise and cost.

[0074] In the actual structure, the bent punches can be arranged at two ends, respectively, of the flat punch group.

[0075] In some embodiments,

[0076] The rotor assembly also includes an insulating layer, which covers the rotor core; the insulating layer is arranged on the surface of the rotor core by injection molding or spraying.

[0077] After the rotor core is formed by stacking, insulation isolation is required when the excitation winding is wound. The insulation method of the present application can be achieved by injection molding or grease spraying, and there is no need to design a special insulation structure to match the rotor core for insulation. Therefore, under special conditions of structural limitations, high speed, and high weather resistance, the use of the folding yoke design of the present application can not only effectively enhance the insulation structure, but also effectively improve the energy efficiency of the motor and reduce costs.

[0078] According to another aspect of the present application, a motor is provided, comprising the core punching sheet as described above or the rotor assembly as described above.

[0079] The motor of the present application, especially the DC motor, adopts the above-mentioned iron core punching sheet or rotor assembly, which has a reasonable and simple structure and is convenient for industrialization; it adopts a multi-purpose and universal innovative design scheme; when its tooth yoke 2 is folded and assembled, it can also effectively increase the magnetic cross-sectional area of ​​the slot, enhance magnetic induction, gather magnetic flux, and reduce eddy current loss at the slot, thereby improving the energy efficiency of the motor, reducing temperature rise and cost.

[0080] It is easy for those skilled in the art to understand that the above-mentioned implementation modes can be freely combined and superimposed without conflict.

[0081] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A core punching sheet, characterized in that: include: An annular body (1) and a tooth yoke (2), wherein a plurality of the tooth yokes (2) are provided and are evenly arranged on the outer wall or the inner wall of the body (1) along the circumference of the body (1); wire grooves are formed between adjacent tooth yokes (2) for accommodating windings; One end of the tooth root portion (21) of the tooth yoke (2) is arranged on the body (1), and the other end is connected to the tooth tip portion of the tooth yoke (2); the tooth tip portion is symmetrically arranged with respect to the radial direction of the body (1), and is provided with a protrusion along the circumferential direction of the body (1); The tooth tip portion comprises a first structure (23), and the surface where the first structure (23) is located is cross-arranged with the surface where the body (1) is located.

2. The core punching sheet according to claim 1, characterized in that: The surface where the first structure (23) is located and the surface where the main body (1) is located are arranged perpendicular to each other.

3. The core punching sheet according to claim 1 or 2, characterized in that: The tooth tip portion further comprises a second structure (22), and the surface where the second structure (22) is located is in the same plane as the surface where the main body (1) is located.

4. The core punching sheet according to claim 3, characterized in that: Along the circumferential direction of the main body (1), the width of the tooth tip portion is set to W2, and the width of the tooth root portion (21) is set to W1; in the radial direction of the main body (1), the length of the tooth tip portion is set to H2, and the length of the tooth root portion (21) is set to H1, satisfying W2>4×W1, H1>2×H2.

5. The core punching sheet according to claim 4, characterized in that: The side wall of the body (1) connected to the tooth yoke (2) is formed by a plurality of straight segment side edges (11) connected in sequence, one end of the tooth root portion (21) is arranged on the straight segment side edge (11), and both are arranged radially symmetrically with respect to the body (1); when the tooth tip portion is the second structure (22), the protrusion is arranged close to the side edge of the body (1) and parallel to the straight segment side edge (11).

6. The core punching sheet according to claim 5, characterized in that: The length of the straight line segment is set to W3, satisfying W3≥4 / 5×W2.

7. A rotor assembly, characterized in that: It comprises a rotor core, which is formed by stacking the core punching sheets as described in any one of claims 1 to 6.

8. The rotor assembly according to claim 7, characterized in that: When the tooth tip is the first structure (23), the core punch is set as a bent punch; when the tooth tip is the second structure (22), the core punch is set as a flat punch; the rotor core is composed of a plurality of the flat punches and at least one bent punch stacked together, and a plurality of the flat punches are stacked to form a flat punch group; the bent punch is arranged on one side of the flat punch group, and the tooth tip of the bent punch is located in a direction away from the stacked flat punches.

9. The rotor assembly according to claim 8, characterized in that: The rotor assembly also includes an insulating layer, which covers the rotor core; the insulating layer is arranged on the surface of the rotor core by injection molding or spraying.

10. A motor, characterized in that: It comprises the core punching sheet as described in any one of claims 1 to 6 or the rotor assembly as described in any one of claims 7 to 9.

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