Rotor core, rotor and motor

Abstract

The utility model provides a rotor iron core, a rotor and a motor. The rotor iron core at least comprises a first sub-iron core and a second sub-iron core which are connected along the axial direction of the rotor iron core. The first sub-iron core is provided with a plurality of first through grooves and first notches which penetrate through the two axial ends of the first sub-iron core, the first notches are communicated with the first through grooves and the peripheral surface of the first sub-iron core, the first sub-iron core at least comprises two first punching sheets, and the projection of the inner wall surface of each first through groove in the axial direction is a first line; the second sub-iron core is provided with a plurality of second through grooves and second notches which penetrate through two axial ends of the second sub-iron core, and the second notches are communicated with the second through grooves and the peripheral surface of the second sub-iron core; the peripheral surface between two adjacent first notches is a first section surface, and the peripheral surface between two adjacent second notches is a second section surface; and on the projection in the axial direction, the first section surface and the second section surface are arranged in a staggered manner, so that the technical problem that the performance of the rotor core is reduced due to inclined arrangement of the aluminum grooves in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a rotor core, a rotor and a motor. Background Art

[0002] Asynchronous motors have been widely used in daily life and industrial scenarios due to their simple structure, low failure rate and relatively low cost. The rotor is the key component of the asynchronous motor.

[0003] The asynchronous motor rotor mostly adopts the skew slot design, which can reduce the harmonic content of the motor, reduce the additional loss of the rotor, reduce the motor operating current, and improve the motor efficiency. The skew slot design can also reduce the running noise of the motor. Figure 9-11 As shown, the conventional chute design is achieved by rotating and staggering identical punchings in the same direction, ensuring that the aluminum slots on any punching do not overlap. The chute slope must meet the design value to achieve the desired effect. Specifically, when the chute slope meets the preset value, harmonic content can be reduced, rotor accessory losses can be lowered, noise levels can be improved, and ultimately rotor performance can be enhanced.

[0004] However, the design and process of the skew slot are affected by many factors, such as the buckle point structure design and the influence of cast aluminum. During the rotor manufacturing process, the skew slot slope may deviate significantly from the design value. When the slope of the rotor skew slot deviates significantly from the design value (exceeding the reasonable error range), the setting of the skew slot will have an adverse effect on the operation of the rotor, that is, the actual performance indicators of the motor are lower than the design values.

[0005] How to avoid the degradation of the rotor performance of the asynchronous motor caused by the change of the aluminum slot inclination angle is a technical problem that needs to be solved urgently. Utility Model Content

[0006] Therefore, the utility model provides a rotor core, a rotor and a motor to solve the technical problem in the prior art that the performance of the rotor core is reduced due to the tilted arrangement of the aluminum slots.

[0007] In a first aspect, the present invention provides a rotor core, wherein the rotor core includes at least a first sub-core and a second sub-core connected along its own axial direction; the first sub-core is provided with a plurality of first through-slots and first notches running through its own axial ends, the first notches communicating with the first through-slots and the outer peripheral surface of the first sub-core, the first sub-core includes at least two first punchings, and the projection of the inner wall surface of the first through-slot along the axial direction is a first line; the second sub-core is provided with a plurality of second through-slots and second notches running through its own axial ends, the second notches communicating with the second through-slots and the outer peripheral surface of the second sub-core;

[0008] The outer peripheral surface between two adjacent first notches is a first segment surface, and the outer peripheral surface between two adjacent second notches is a second segment surface; in the projection in the axial direction, the first segment surface and the second segment surface are staggered.

[0009] In some embodiments, the second sub-core includes at least two second punching sheets, and a projection of an inner wall surface of the second through slot along the axial direction is a second line.

[0010] In some embodiments, when the first line and the second line are formed, the first line and the second line completely coincide with each other.

[0011] In some embodiments, along the circumferential direction of the rotor core, the first slot includes a first side surface A and a first side surface B that are opposite to each other;

[0012] A projection of the first side surface A along the axial direction is linear, and / or a projection of the first side surface B along the axial direction is linear.

[0013] In some embodiments, along the circumferential direction of the rotor core, the second slot includes a second side surface A and a second side surface B that are opposite to each other;

[0014] A projection of the second side surface A along the axial direction is linear, and / or a projection of the second side surface B along the axial direction is linear.

[0015] In some embodiments, the first through slot is symmetrical about a plane D passing through the axis of the rotor core, the maximum distance between the first side surface A and the plane D is L1, the maximum distance between the second side surface A and the plane D is L2, and L1>L2.

[0016] In some embodiments, each of the first punching sheets is provided with a first connecting portion for connecting two adjacent first punching sheets, and the first connecting portion is located at the same position on each of the first punching sheets;

[0017] and / or,

[0018] Each second punch is provided with a second connecting portion for connecting two adjacent second punches, and the second connecting portion is located at the same position on each second punch.

[0019] In some embodiments, the first sub-core is provided with a first through hole passing through each of the first punching sheets, the second sub-core is provided with a second through hole passing through each of the second punching sheets, the first through hole and the second through hole are connected, and rivets are provided in the first through hole and the second through hole.

[0020] In a second aspect, the present invention further provides a rotor comprising the rotor core.

[0021] In a third aspect, the utility model provides a motor including the rotor.

[0022] The utility model achieves the purpose of reducing harmonic content and reducing additional losses of the rotor by staggering the first section surface and the second section surface in the projection in the axial direction; and because the projection of the inner wall surface of the first through slot along the axial direction is the first line, rotation of the first punching sheet during the aluminum casting process of the first sub-core is avoided, the stability of the rotor core is improved, and the performance of the rotor core is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0024] Figure 1 This is a schematic diagram of the first punching structure of an embodiment of the utility model;

[0025] Figure 2 This is an embodiment of the utility model Figure 1 Enlarged view of point E in the middle;

[0026] Figure 3 This is a schematic diagram of the second punching structure of an embodiment of the utility model;

[0027] Figure 4 This is an embodiment of the utility model Figure 3 Enlarged view of point F in the middle;

[0028] Figure 5 This is a radial schematic diagram of the rotor core of an embodiment of the present utility model;

[0029] Figure 6 This is an embodiment of the utility model Figure 5 Enlarged view of point G in the middle;

[0030] Figure 7 This is an axial schematic diagram of the rotor core of an embodiment of the present utility model;

[0031] Figure 8 This is an embodiment of the utility model Figure 7 Enlarged view of H in the middle;

[0032] Figure 9 It is a schematic diagram of the punching structure of the rotor core in the prior art;

[0033] Figure 10It is the axial adaptation diagram of the rotor core in the prior art;

[0034] Figure 11 It is a radial schematic diagram of the rotor core in the prior art;

[0035] The accompanying drawings are:

[0036] 1. First sub-core; 101. First through-slot; 102. First notch; 103. First section; 104. First punch; 105. First connecting portion; 2. Second sub-core; 201. Second through-slot; 202. Second notch; 203. Second section; 204. Second punch; 205. Second connecting portion; 1021. First side A; 1022. First side B; 2021. Second side A; 2022. Second side B. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0040] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0041] The utility model provides a rotor core, a rotor and a motor, so as to solve the technical problem in the prior art that the performance of the rotor core is reduced due to the tilted arrangement of aluminum slots.

[0042] Please refer to the attached Figure 1-8 As shown, the present invention provides a rotor core, which includes at least a first sub-core 1 and a second sub-core 2 connected along its own axial direction; the first sub-core 1 is provided with a plurality of first through-slots 101 and first notches 102 that pass through its own axial ends, and the first notches 102 communicate with the first through-slots 101 and the outer circumferential surface of the first sub-core 1, and the first sub-core 1 includes at least two first punchings 104, and the projection of the inner wall surface of the first through-slot 101 along the axial direction is a first line; the second sub-core 2 is provided with a plurality of second through-slots 201 and second notches 202 that pass through its own axial ends, and the second notches 202 communicate with the second through-slots 201 and the outer circumferential surface of the second sub-core 2;

[0043] The outer circumferential surface between two adjacent first notches 102 is a first segment surface 103 , and the outer circumferential surface between two adjacent second notches 202 is a second segment surface 203 . In the axial projection, the first segment surface 103 and the second segment surface 203 are staggered.

[0044] By staggering the above-mentioned first section surface 103 and second section surface 203 in the axial direction, while ensuring that the rotor core reduces the harmonic content during operation, reduces the additional loss of the rotor, and improves the efficiency of the motor, since the inner wall surface of the first through slot 101 included in the first sub-core 1 is projected as a first line along the direction of the rotating shaft, the first sub-core 1 includes at least two first punching sheets 104. Compared with the prior art, all the first punching sheets 104 of the present application do not need to rotate around the axis of the rotor core, and the inner wall surface of the first through slot 101 is projected as a first line along the axial direction (that is, the first through slot 101 is a straight slot along the axial direction, and the first through slot 101 of the first sub-core 1 is not tilted). When multiple first punching sheets 104 are fixed together, they are more firmly. During the aluminum casting process in the first through slot 101, the probability of multiple first punching sheets 104 rotating is greatly reduced. This allows the staggered position between the first section surface 103 and the second section surface 203 to remain stable, thereby ensuring the stability of reducing the harmonic content during operation of the rotor core. The production process of the first sub-core 1 is simplified, production time is saved, and the production cost of the motor is reduced.

[0045] The offset distance between the first segment 103 and the second segment 203 is not greater than the width of any one of the two notches. Figure 6 As shown, the first notch 102 has a width D1, the second notch 202 has a width D2, and the offset distance is D3, where D3<D1 and D3<D2.

[0046] The first through slots 101 of the first sub-core 1 are straight slots, eliminating misalignment between adjacent first punchings 104. This prevents aluminum from being trapped during aluminum casting (where misalignment between adjacent first punchings 104 could cause aluminum to enter the molten aluminum), improving the quality of the rotor core. Similarly, the straight nature of the first through slots 101 simplifies the production process of the first sub-core 1, improving production efficiency and quality.

[0047] Compared with the prior art in which the cast aluminum slots are set as inclined slots, the straight slot structure of the present application requires less aluminum, thereby reducing the cost of the rotor core.

[0048] Preferably, Figure 6 As shown, the second sub-core 2 includes at least two second punching sheets 204 , and the projection of the inner wall surface of the second through slot 201 along the axial direction is a second line.

[0049] The projection of the inner wall surface of the second through slot 201 along the axial direction is a second line, that is, compared with the axis of the rotor core, the second through slot 201 is a straight slot, not an inclined shape, and the multiple second punching sheets 204 are more firmly fixed together. During the aluminum casting process in the second through slot 201, the probability of the multiple second punching sheets 204 rotating relative to the axis of the rotor core is greatly reduced, which enables the misalignment between the first section 103 and the second section 203 to remain stable, thereby ensuring the stability of reducing the harmonic content during the operation of the rotor core.

[0050] Preferably, Figure 7 and Figure 8 As shown, when the first line and the second line are formed, the first line and the second line completely overlap.

[0051] The first line coincides with the second line, so that the inner wall surface of the first through slot 101 and the inner wall surface of the second through slot 201 form the same surface, which is conducive to the convenience and stability of aluminum casting, avoids aluminum clamping, further improves the stability of the rotor core, and avoids the possibility of rotation of the first punching sheet 104 and the second punching sheet 204.

[0052] Preferably, Figure 2 、 Figure 6 As shown, along the circumferential direction of the rotor core, the first slot 102 includes a first side surface A1021 and a first side surface B1022 that are opposite to each other;

[0053] The projection of the first side surface A1021 along the axial direction is linear, and / or the projection of the first side surface B1022 along the axial direction is linear.

[0054] The projections of the first side surface A1021 and the first side surface B1022 along the axial direction are linear, which is beneficial to improving the efficiency of aluminum casting, avoiding aluminum inclusions in the slots, and improving the performance of the rotor core.

[0055] Preferably, Figure 4 and Figure 6 As shown, along the circumferential direction of the rotor core, the second slot 202 includes a second side surface A2021 and a second side surface B2022 that are opposite to each other;

[0056] The projection of the second side surface A2021 along the axial direction is linear, and / or the projection of the second side surface B2022 along the axial direction is linear.

[0057] The projections of the second side surface A2021 and the second side surface B2022 along the axial direction are linear, which is beneficial to improving the efficiency of aluminum casting, avoiding aluminum sandwiches in the slots, and improving the performance of the rotor core.

[0058] Preferably, Figure 2 、 Figure 4 and Figure 6 As shown, the first through slot 101 is symmetrical about a plane D passing through the axis of the rotor core, the maximum distance between the first side surface A1021 and the plane D is L1, the maximum distance between the second side surface A2021 and the plane D is L2, and L1>L2.

[0059] By L1>L2 (that is, the first side surface A1021 and the first side surface B1022 are asymmetric about plane D, and the second side surface A2021 and the second side surface B2022 are asymmetric about plane D), the slots of the rotor core form an asymmetric structure, which can reduce the harmonic content and reduce the additional loss of the rotor.

[0060] The rotor core also includes more sub-cores along its own axial direction. From the first end to the second end of the rotor core, multiple sub-cores are arranged in sequence. The slot of each sub-core has side A and side B. The projections of the side A of each sub-core in the axial direction all overlap, and the projections of the side B of each sub-core in the axial direction all overlap. From one end to the other end of the rotor core, the side A of each sub-core (the sub-core here includes the first sub-core 1 and the second sub-core 2 mentioned above) is gradually deflected along the same circumferential direction of the rotor core, that is, multiple slots are inclined, thereby ensuring that the harmonic content of the rotor core is reduced, thereby reducing additional losses.

[0061] Preferably, Figure 1 、 Figure 3 As shown, each of the first punching sheets 104 is provided with a first connecting portion 105 for connecting two adjacent first punching sheets 104 , and the first connecting portion 105 is located at the same position on each of the first punching sheets 104 ;

[0062] and / or,

[0063] Each second punching piece 204 is provided with a second connecting portion 205 for connecting two adjacent second punching pieces 204 , and the second connecting portion 205 is located at the same position on each second punching piece 204 .

[0064] Each first punching plate 104 is provided with a first connecting portion 105 for connecting two adjacent first punching plates 104, and the first connecting portion 105 is located in the same position on each first punching plate 104; this enables the first punching plates 104 to be mass-produced, with higher efficiency and guaranteed quality. It is precisely because the first through slot 101 of the first sub-core 1 is a straight slot that the first connecting portion 105 is located in the same position on each first punching plate 104. This improves production efficiency while ensuring a lower harmonic content. Since the first connecting portion 105 is located in the same position on the first punching plates 104, the difficulty of mold design is reduced and the mold's service life is increased.

[0065] The configuration of the second punching plate 204 is the same as that of the first punching plate 104 and will not be further described.

[0066] Preferably, Figure 1 and Figure 3 As shown, the first connecting portion 105 is a first buckle point, and the second connecting portion 205 is a second buckle point. The first buckle point and the second buckle point have the same structure. This connection method is a prior art, and its specific structure and connection principle are not described again. Each punch (including the first punch 104 and the second punch 204) is stacked together, and the buckle points on each punch completely correspond to each other. After the punches are stacked, they are connected and fixed together by the buckle points.

[0067] Preferably, the first sub-core 1 is provided with a first through hole passing through each of the first punching sheets 104, and the second sub-core 2 is provided with a second through hole passing through each of the second punching sheets 204, the first through hole and the second through hole are connected, and rivets are provided in the first through hole and the second through hole.

[0068] The first punching sheets 104 are fixed together by rivets to form the first sub-core 1 , and the second punching sheets 204 are fixed together to form the second sub-core 2 , thereby improving production efficiency.

[0069] In a second aspect, the utility model discloses a rotor, comprising the rotor core.

[0070] A non-magnetic connecting member is provided in the first through slot 101, and the rotor is a squirrel cage rotor. The non-magnetic material is preferably aluminum.

[0071] The utility model also provides a motor, comprising the rotor.

[0072] The use of the above-mentioned rotor can reduce the additional loss of the motor, improve the efficiency of the motor, and have the advantages of reducing the production cost and material cost of the motor.

[0073] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. The above description is only a preferred embodiment of the present invention. 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 invention. Such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A rotor core, characterized in that: The rotor core comprises at least a first sub-core (1) and a second sub-core (2) connected to each other along its own axial direction; the first sub-core (1) is provided with a plurality of first through slots (101) and first notches (102) passing through its own axial ends, the first notches (102) communicating with the first through slots (101) and the outer peripheral surface of the first sub-core (1); the first sub-core (1) comprises at least two first punching sheets (104), the inner wall surface of the first through slot (101) being projected along the axial direction as a first line; the second sub-core (2) is provided with a plurality of second through slots (201) and second notches (202) passing through its own axial ends, the second notches (202) communicating with the second through slots (201) and the outer peripheral surface of the second sub-core (2); The outer peripheral surface between two adjacent first notches (102) is a first segment surface (103), and the outer peripheral surface between two adjacent second notches (202) is a second segment surface (203); in the projection in the axial direction, the first segment surface (103) and the second segment surface (203) are staggered.

2. The rotor core according to claim 1, characterized in that The second sub-core (2) comprises at least two second punching sheets (204), and the projection of the inner wall surface of the second through slot (201) along the axial direction is a second line.

3. The rotor core according to claim 2, characterized in that: When the first line and the second line are formed, the first line and the second line completely overlap.

4. The rotor core according to any one of claims 1 to 3, characterized in that: Along the circumferential direction of the rotor core, the first slot (102) includes a first side surface A (1021) and a first side surface B (1022) that are opposite to each other; The projection of the first side surface A (1021) along the axial direction is linear, and / or the projection of the first side surface B (1022) along the axial direction is linear.

5. The rotor core according to claim 4, characterized in that: Along the circumferential direction of the rotor core, the second slot (202) includes a second side surface A (2021) and a second side surface B (2022) that are opposite to each other; The projection of the second side surface A (2021) along the axial direction is linear, and / or the projection of the second side surface B (2022) along the axial direction is linear.

6. The rotor core according to claim 5, characterized in that The first through slot (101) is symmetrical about a plane D passing through the axis of the rotor core, the maximum distance between the first side surface A (1021) and the plane D is L1, the maximum distance between the second side surface A (2021) and the plane D is L2, and L1>L2.

7. The rotor core according to claim 6, characterized in that: Each of the first punching sheets (104) is provided with a first connecting portion (105) for connecting two adjacent first punching sheets (104), and the first connecting portion (105) is located at the same position on each of the first punching sheets (104); and / or, Each second punch (204) is provided with a second connecting portion (205) for connecting two adjacent second punches (204), and the position of the second connecting portion (205) on each second punch (204) is the same.

8. The rotor core according to claim 6, wherein: The first sub-core (1) is provided with a first through hole penetrating each of the first punching sheets (104), and the second sub-core (2) is provided with a second through hole penetrating each of the second punching sheets (204), the first through hole and the second through hole are communicated, and rivets are provided in the first through hole and the second through hole.

9. A rotor, characterized in that: The rotor core comprises the rotor core according to any one of claims 1 to 8.

10. A motor, characterized in that: Comprising the rotor according to claim 9.

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