Motor core assembly

Abstract

A motor core assembly is disclosed. A motor core assembly according to an exemplary embodiment of the disclosed present invention is a stack of a plurality of core sheets cut from electrical steel sheets including two or more overlapping layers, wherein at least one first layer of the core sheets includes a first burr portion extending downward from a first front end portion of the edge end, at least one second layer overlapping the first layer includes a second burr portion extending downward from a second front end portion of the edge end, and the lengths of the first burr portion and the second burr portion may be different from each other.

Description

Motor core assembly

[0001] An embodiment of the present invention relates to a motor core assembly, and more specifically, to a motor core assembly with an improved laminated structure of core sheets.

[0002] Generally, iron core structures are applied to inductors and conductors used in generators, motors, transformers, and power equipment to utilize the electromagnetic induction phenomenon generated by the current flowing through the wires.

[0003] Meanwhile, as an iron core structure, the motor core may be provided as a core laminate in which electrical steel sheets are laminated and bonded. A method for manufacturing such a core laminate involves laminating core sheets of electrical steel and utilizing mechanical joining methods such as welding, clamping, and interlocking to join the laminated core sheets.

[0004] Recently, chemical bonding methods such as dot bonding or self-bonding are being used, in which heat and pressure are applied to core sheets coated with a coating material (e.g., a coating material having insulation and fusion performance) on the surface of electrical steel sheets to heat-fuse the core sheets.

[0005] These core sheets are manufactured by a cutting method in which electrical steel strips unwound from a skelp are press-stamped or punched into a set shape.

[0006] Recently, in order to improve the productivity of motor cores, a method has been developed and introduced in which electrical steel strips are stacked in two or more layers and core sheets are cut by stamping or punching.

[0007] In this way, core sheets that have been cut and processed into two or more layers are laminated, and the laminated core sheets are bonded by a mechanical bonding method or a chemical bonding method, thereby manufacturing a core assembly applicable to a motor.

[0008] The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs.

[0009] Embodiments of the present invention aim to provide a motor core assembly that minimizes the penetration of external heat or foreign substances between core sheets by means of laminated layers of core sheets cut from electrical steel sheet strips stacked in at least two layers.

[0010] A motor core assembly according to an embodiment of the present invention comprises a plurality of core sheets cut from electrical steel sheets stacked in two or more layers, wherein at least one first layer among the core sheets includes a first burr portion extending downward from a first shear portion at an edge end, and at least one second layer overlapping with the first layer includes a second burr portion extending downward from a second shear portion at an edge end, provided that the lengths of the first burr portion and the second burr portion may be different.

[0011] In addition, in the motor core assembly according to an embodiment of the present invention, the first layer may be located on the upper side and the second layer may be located on the lower side.

[0012] In addition, in the motor core assembly according to an embodiment of the present invention, the length of the first burr portion may be longer than the length of the second burr portion.

[0013] In addition, in the motor core assembly according to an embodiment of the present invention, the first burr portion may be formed as a blocking portion that blocks between the first layer and the second layer.

[0014] In addition, in the motor core assembly according to an embodiment of the present invention, the first layer may include a first roll-over portion extending upward from the first front portion.

[0015] In addition, in the motor core assembly according to an embodiment of the present invention, the second layer may include a second roll-over portion extending upward from the second front portion.

[0016] In addition, in the motor core assembly according to an embodiment of the present invention, the height section lengths of the first roll-over section and the second roll-over section may be different.

[0017] In addition, in the motor core assembly according to an embodiment of the present invention, the height section length of the second roll-over portion may be longer than the height section length of the first roll-over portion.

[0018] In addition, in the motor core assembly according to an embodiment of the present invention, the first burr portion may overlap with the second roll-over portion.

[0019] In addition, the motor core assembly according to an embodiment of the present invention can satisfy the condition D=T×0.1, where k1 is the length of the first burr portion, k2 is the length of the second burr portion, D is the difference between k1 and k2 (k1-k2), t1 is the thickness of the first layer, t2 is the thickness of the second layer, and T is the thicker thickness among t1 and t2.

[0020] In addition, in the motor core assembly according to an embodiment of the present invention, the layer stacking section satisfying the condition D=T×0.1 may be located at one or more of the points 1 / 3, 1 / 2, and 3 / 4 of the total stacking height section of the core sheets.

[0021] In addition, in the motor core assembly according to an embodiment of the present invention, the layer stacking section satisfying the condition D=T×0.1 may be located at one or more points spaced 10 degrees apart from the central axis of the core sheets.

[0022] In addition, the motor core assembly according to an embodiment of the present invention may include any one of a stator core, a rotor core, and a split core.

[0023] According to the motor core assembly according to the embodiments of the present invention, heat and foreign substances penetrating between core sheets can be blocked by utilizing the burr and roll-over portions generated when cutting electrical steel sheet strips stacked in two or more layers.

[0024] Furthermore, other effects that can be obtained or predicted by the embodiments of the present invention will be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to the embodiments of the present invention will be disclosed within the detailed description to be set forth below.

[0025] These drawings are for reference to explain exemplary embodiments of the present invention, and therefore, the technical concept of the present invention should not be interpreted as being limited to the attached drawings.

[0026] FIG. 1 is a schematic diagram illustrating a motor core assembly according to an embodiment of the present invention.

[0027] FIG. 2 is a drawing illustrating an application example of a motor core assembly according to an embodiment of the present invention.

[0028] FIG. 3 is a drawing illustrating the cutting process of a multi-layer electrical steel strip for manufacturing a motor core assembly according to an embodiment of the present invention.

[0029] FIG. 4 is a schematically enlarged view of a layer stacking section applied to a motor core assembly according to an embodiment of the present invention.

[0030] FIG. 5 is a drawing showing the main dimensions of a layer stacking section applied to a motor core assembly according to an embodiment of the present invention.

[0031] FIG. 6 is a drawing showing the location of a layer stacking section applied to a motor core assembly according to an embodiment of the present invention.

[0032] The drawings referenced above are not necessarily drawn to scale and should be understood as presenting somewhat simplified representations of various preferred features illustrating the basic principles of the invention. For example, specific design features of the invention, including specific dimensions, orientations, positions, and shapes, will be partially determined by specific intended applications and usage environments.

[0033] The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used herein, singular forms are intended to also include plural forms unless explicitly otherwise indicated in the context. It will also be understood that the terms “comprising” and / or “comprising,” as used herein, specify the presence of the mentioned features, integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more of other features, integers, steps, operations, components, components and / or groups thereof. As used herein, the term “and / or” includes any one or all combinations of the associated items listed.

[0034] With reference to the attached drawings, the present disclosure is described in detail so that those skilled in the art can easily practice it. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein.

[0035] To clearly explain the present disclosure, parts unrelated to the description have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0036] In addition, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present disclosure is not necessarily limited to what is shown in the drawings; thicknesses have been enlarged to clearly represent various parts and regions.

[0037] The suffixes "absence" and / or "part" for components used in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0038] In addition, when describing the disclosed embodiments, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description is omitted.

[0039] In addition, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of this disclosure are included.

[0040] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms.

[0041] Expressions written in the singular in the description below may be interpreted as singular or plural unless explicit expressions such as "one" or "singular" are used.

[0042] The above terms are used solely for the purpose of distinguishing one component from another.

[0043] Hereinafter, a motor core assembly according to an exemplary embodiment will be described in detail with reference to the attached drawings.

[0044] FIG. 1 is a schematic diagram illustrating a motor core assembly according to an embodiment of the present invention.

[0045] Referring to FIG. 1, a motor core assembly (100) according to an embodiment of the present invention can be applied to a drive motor of an eco-friendly vehicle, including an electric vehicle (or hydrogen electric vehicle) driven by a fuel cell or electricity as a power source, an electric vehicle-based PBV, and a hybrid vehicle driven by an engine and a battery.

[0046] For example, the drive motor may include a permanent magnet synchronous motor (PMSM) or a wound rotor synchronous motor (WRSM).

[0047] As described above, although the motor core assembly (100) according to the embodiment of the present invention is described as being applied to the drive motor of eco-friendly vehicles, the scope of protection of the present invention should not be understood as necessarily being limited thereto, and the technical concept of the present invention may be applied to drive motors of various types and uses.

[0048] A motor core assembly (100) according to an embodiment of the present invention comprises a plurality of core sheets (10) that are cut into a set shape from an electrical steel sheet having a coating layer (1) on which a coating material (e.g., a coating material having insulation performance and fusion performance) is applied to the surface, and are stacked in a set number.

[0049] Here, the core sheets (10) may be provided as a core laminate joined by mechanical joining methods such as welding, clamping, and interlocking, and may also be provided as a core laminate heat-fused by a coating layer (1) in a set temperature and pressure atmosphere.

[0050] The motor core assembly (100) according to such an embodiment of the present invention may be hollow stator cores (3) as shown in FIG. 2 (a), hollow rotor cores (5) as shown in FIG. 2 (b), and block-shaped segmented cores (7) as shown in FIG. 2 (c).

[0051] In this specification, the reference direction for describing the following components may be set to the vertical direction (e.g., height direction) with respect to the drawings.

[0052] Furthermore, in this specification, the 'upper part', 'upper', 'upper', or 'upper surface' of a component indicates an end, part, end, or surface of a component that is relatively higher in the drawing, and the 'lower part', 'lower', 'lower', or 'lower surface' of a component indicates an end, part, end, or surface of a component that is relatively lower in the drawing.

[0053] Furthermore, in this specification, an end of a component (e.g., one end or the other end, etc.) indicates an end of the component in any one direction, and an end portion of a component (e.g., one end or the other end, etc.) indicates a certain part of the component including the end.

[0054] Meanwhile, the motor core assembly (100) according to an embodiment of the present invention may be composed of a laminate of core sheets (10) cut by a press stamping or punching cutting method from electrical steel sheet strips (2) that are unwound from a skelp in two or more layers, as shown in FIG. 3.

[0055] The motor core assembly (100) according to the embodiment of the present invention provides a structure that minimizes external heat or foreign substances from penetrating between the core sheets (10) by means of stacked layers of core sheets (10) cut from electrical steel strips (2) stacked in at least two layers (or multi-layers).

[0056] FIG. 4 is a schematically enlarged view of a layer stacking section applied to a motor core assembly according to an embodiment of the present invention.

[0057] Referring to FIG. 4, a motor core assembly (100) according to an embodiment of the present invention may include a layer stacking section (11) in which a burr is formed among the core sheets (10) as described above.

[0058] In an embodiment of the present invention, the layer stacking section (11) may include at least one first layer (21) and at least one second layer (31) arranged continuously along the stacking direction of the core sheets (10).

[0059] Here, the first layer (21) and the second layer (31) are stacked along the vertical direction, for example, the first layer (21) may be located on the upper side and the second layer (31) may be located on the lower side.

[0060] The first layer (21) includes a first burr section (23) and a first roll over section (25).

[0061] The first burr portion (23) extends downward from the first shear portion (27) at the edge end of the first layer (21). The first roll-over portion (25) extends upward from the first shear portion (27).

[0062] And, the second layer (31) overlapping with the first layer (21) includes a second burr portion (33) and a second roll over portion (35).

[0063] The second burr portion (33) extends downward from the second shear portion (37) at the edge end of the second layer (31). The second roll-over portion (35) extends upward from the second shear portion (37).

[0064] The first burr portion (23) and second burr portion (33) of the first layer (21) and second layer (31), the first roll-over portion (25) and second roll-over portion (35), and the first shear portion (27) and second shear portion (37) can be formed by cutting the electrical steel sheet strips (2) stacked in two layers by a cutting method of press stamping or punching, as shown in FIG. 3.

[0065] FIG. 5 is a drawing showing the main dimensions of a layer stacking section applied to a motor core assembly according to an embodiment of the present invention.

[0066] Referring to FIG. 5, in an embodiment of the present invention, the length (k1) of the first burr portion (23) of the first layer (21) and the length (k2) of the second burr portion (33) of the second layer (31) may be different from each other.

[0067] And, the height section length (RO1) of the first roll-over section (25) of the first layer (21) and the height section length (RO2) of the second roll-over section (35) of the second layer (31) may be different from each other.

[0068] Furthermore, in an embodiment of the present invention, the length (k1) of the first burr portion (23) of the first layer (21) may be longer than the length (k2) of the second burr portion (33) of the second layer (31).

[0069] In addition, in an embodiment of the present invention, the height section length (RO2) of the second roll-over section (35) of the second layer (31) may be longer than the height section length (RO1) of the first roll-over section (25) of the first layer (21).

[0070] Here, the first burr portion (23) of the first layer (21) as described above overlaps with the second roll-over portion (35) of the second layer (31). Accordingly, the first burr portion (23) of the first layer (21) can be formed as a blocking portion (24) that blocks between the first layer (21) and the second layer (31).

[0071] Meanwhile, the layer stacking section (11) according to an embodiment of the present invention can satisfy the condition D=T×0.1 when the length of the first burr portion (23) is k1, the length of the second burr portion (33) is k2, the difference between k1 and k2 (k1-k2) is D, the thickness of the first layer (21) is t1, the thickness of the second layer (31) is t2, and the thicker thickness among t1 and t2 is T.

[0072] That is, the length difference (k1-k2) (or height difference) between the first burr portion (23) and the second burr portion (33) is preferably greater than 10% of the thickness of the layer having the thicker thickness between t1 and t2 of the first layer (21) and the second layer (31).

[0073] The reason the difference in length between the first burr portion (23) and the second burr portion (33) is limited to a value exceeding 10% of the thickness of the layer having the thicker thickness between t1 and t2 of the first layer (21) and the second layer (31) is to allow the first burr portion (23) to easily block between the first layer (21) and the second layer (31).

[0074] A layer stacking section (11) satisfying the condition D=T×0.1 as described above may be located at one or more of the 1 / 3, 1 / 2, and 3 / 4 points in the entire stacking height section of the core sheets (10), as shown in FIG. 6.

[0075] And, the layer stacking section (11) satisfying the condition D=T×0.1 above may be located at one or more points at an angle (e.g., 10 degrees) interval from the central axis (C1) of the core sheets (10) constituting the stator core (3), rotor core (5) and split core (7) as shown in FIG. 2.

[0076] Accordingly, according to the motor core assembly (100) of the embodiment of the present invention configured as described above, the electrical steel sheet strips (2) stacked in two layers can be composed of a laminate of core sheets (10) cut by a cutting method of press stamping or punching.

[0077] Thus, according to the motor core assembly (100) according to an embodiment of the present invention, the productivity of the motor core and the drive motor can be improved.

[0078] Furthermore, according to the motor core assembly (100) of the embodiment of the present invention, heat and foreign substances penetrating between the core sheets (10) can be blocked by using the burr and roll-over portions generated when cutting the electrical steel sheet strips (2) stacked in two or more layers.

[0079] To elaborate, the motor core assembly (100) according to an embodiment of the present invention provides a structure in which the length of the first burr portion (23) formed in the first layer (21) of the layer stacking section (11) is longer than the length of the second burr portion (33) formed in the second layer (31).

[0080] In addition, the motor core assembly (100) according to an embodiment of the present invention provides a structure in which the height section length of the second roll-over portion (35) formed in the second layer (31) is longer than the height section length of the first roll-over portion (25) formed in the first layer (21).

[0081] And, the motor core assembly (100) according to an embodiment of the present invention provides a structure in which a first layer (21) and a second layer (31) are stacked along the vertical direction, and a first burr portion (23) of the first layer (21) overlaps with a second roll-over portion (35) of the second layer (31).

[0082] Thus, according to the motor core assembly (100) according to an embodiment of the present invention, the bonding strength of the core sheets (10) can be increased.

[0083] In addition, according to the motor core assembly (100) according to an embodiment of the present invention, the first burr portion (23) of the first layer (21) is formed as a blocking portion (24) that blocks between the first layer (21) and the second layer (31), thereby preventing external heat and foreign substances from penetrating between the core sheets (10).

[0084] Accordingly, according to the motor core assembly (100) according to an embodiment of the present invention, the assembly and productivity of the core sheets (10) can be improved, and the driving efficiency of the driving motor can be further improved.

[0085] Although embodiments of the present invention have been described above, the technical concept of the present invention is not limited to the embodiments presented in this specification. A person skilled in the art who understands the technical concept of the present invention may easily propose other embodiments by adding, changing, deleting, or adding components within the scope of the same technical concept, and such are also to be included within the scope of the rights of the present invention.

[0086] [Explanation of the symbol]

[0087] 1: Coating layer

[0088] 2: Electrical steel strip

[0089] 3: Stator core

[0090] 5: Rotor core

[0091] 7: Split Core

[0092] 10: Core Sheet

[0093] 11: Layer Stacking Section

[0094] 21: 1st Layer

[0095] 23: The 1st Burbu

[0096] 24: Blocking section

[0097] 25: 1st Roll Over

[0098] 27: First shear section

[0099] 31: 2nd layer

[0100] 33: 2nd Burbu

[0101] 35: 2nd Roll Over

[0102] 37: Second front section

[0103] 100: Motor core assembly

Claims

A motor core assembly having a plurality of core sheets cut from electrical steel sheets stacked in 1.2 or more layers, wherein At least one first layer among the above core sheets includes a first burr portion extending downward from a first shear portion of an edge end, and At least one second layer overlapping with the first layer includes a second burr portion extending downward from a second shear portion of the edge end, wherein A motor core assembly having different lengths for the first burr portion and the second burr portion.

2. In Paragraph 1, The first layer is located on the upper side, and the second layer is located on the lower side, and A motor core assembly in which the length of the first burr portion is longer than the length of the second burr portion.

3. In Paragraph 2, The above-mentioned first burr part is, A motor core assembly formed with a blocking portion that blocks the space between the first layer and the second layer.

4. In Paragraph 2, The first layer above includes a first roll-over portion extending upward from the first shear portion, and The second layer includes a second roll-over portion extending upward from the second shear portion, wherein A motor core assembly having different height section lengths for the first roll-over section and the second roll-over section.

5. In Paragraph 4, A motor core assembly in which the height section length of the second roll-over section is longer than the height section length of the first roll-over section.

6. In Paragraph 5, The above first burr portion is a motor core assembly that overlaps with the above second roll-over portion.

7. In Paragraph 2, A motor core assembly satisfying the condition D=T×0.1, where k1 is the length of the first burr portion, k2 is the length of the second burr portion, D is the difference between k1 and k2 (k1-k2), t1 is the thickness of the first layer, t2 is the thickness of the second layer, and T is the thicker thickness among t1 and t2.

8. In Paragraph 7, A layer stacking section satisfying the condition D=T×0.1 above is a motor core assembly located at one or more of the 1 / 3, 1 / 2, and 3 / 4 points in the total stacking height section of the core sheets.

9. In Paragraph 7, A layer stacked section satisfying the condition D=T×0.1 above is a motor core assembly located at one or more points spaced 10 degrees apart from the central axis of the core sheets.

10. In Paragraph 1, The above motor core assembly is, A motor core assembly comprising any one of a stator core, a rotor core, and a split core.

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