Rotor punching sheet

Abstract

The utility model discloses a rotor punching sheet, comprising a rotor punching sheet body, the surface of the rotor punching sheet body is provided with a plurality of conducting bar groove groups, the number of the conducting bar groove groups is eight, the conducting bar groove groups are distributed on the surface of the rotor punching sheet body in an annular array mode, the center position of the rotor punching sheet body is provided with a center shaft hole, and the center shaft hole is provided with a through hole. A protruding part is arranged on the inner wall of the central shaft hole, the protruding part is in a square shape, chamfers are arranged at the corners of the extending portion of the protruding part, a groove is formed in the connecting position of the protruding part and the central shaft hole, and a fool-proof groove is further formed in the inner wall of the central shaft hole. The inner wall of the central shaft hole is provided with the projection part, the groove and the fool-proof groove, thereby improving the identification degree, providing convenience for the accurate installation of the rotor punching sheet body, effectively preventing the damage of the key and the groove caused by the installation dislocation, and improving the installation firmness of the rotor punching sheet body.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor punching sheet. Background Art

[0002] The rotor punching is one of the key components in motor manufacturing. It is mainly used to form the rotor of the motor and is an important factor affecting the performance of the motor.

[0003] CN210041479U was found through searching, which discloses a rotor punching positioning structure. The rotor punching positioning structure includes a rotor punching, which has a central axis hole and N guide bar grooves evenly arranged radially on the outer periphery of the rotor punching, where N is an integer; the inner wall of the central axis hole is evenly arranged with M grooves, one of the M grooves is a positioning groove, and the remaining M-1 grooves are semicircular key grooves, where: N is an integer multiple of M, and M is an integer not less than 3. The utility model solves the problem that in the current rotor punching lamination manufacturing, the rotor core appears high on one side and low on the other side, resulting in a small lamination coefficient, which affects the performance of the motor.

[0004] However, there are still some problems and shortcomings in the use process:

[0005] Since there are M grooves arranged on the inner wall of the central shaft hole of the rotor punching sheet, the positioning groove and the semicircular key groove are similar in shape, and the positions of the positioning groove and the semicircular key groove are distributed on the inner wall of the central shaft hole and are distributed in a ring array, the positioning groove and the semicircular key groove are poorly recognizable and are easily confused. If the key on the rotating shaft is inserted into the wrong corresponding groove, not only will the key and groove be damaged, but the rotor punching sheet will also be unstable and prone to shaking.

[0006] Moreover, the multiple guide bar grooves destroy the circular structure of the rotor punching sheet, and it is easy to break between two adjacent guide bar grooves, which affects the structural strength of the entire rotor punching sheet, so it needs to be improved. Utility Model Content

[0007] The purpose of the utility model is to provide a rotor punching sheet to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rotor punching sheet, comprising a rotor punching sheet body, a plurality of guide bar groove groups are provided on the surface of the rotor punching sheet body, a center shaft hole is provided at the center position of the rotor punching sheet body, a protrusion is provided on the inner wall of the center shaft hole, a groove is provided at the connection between the protrusion and the center shaft hole, and an anti-mistake groove is also provided on the inner wall of the center shaft hole.

[0009] Preferably, the protrusion is square in shape, and chamfers are provided at the corners of the protruding portion of the protrusion.

[0010] Preferably, the number of the bar groove groups is eight, and the bar groove groups are distributed in an annular array on the surface of the rotor punching body.

[0011] Preferably, the bar groove group includes a first bar groove, a second bar groove, and a third bar groove. The two ends of the first bar groove have the same shape, the second bar groove and the third bar groove have the same shape. The first bar groove, the second bar groove, and the third bar groove enclose a triangle, and the second bar groove and the third bar groove are symmetric about the central axis of the first bar groove.

[0012] Preferably, the shape of the anti-fooling groove can be semi-circular, trapezoidal, or square.

[0013] Preferably, 8 heat dissipation holes are formed in an annular array on the surface of the rotor punching body, and the shape of the heat dissipation holes is kidney-shaped.

[0014] Preferably, 8 convex blocks are fixedly connected in an annular array on the surface of the rotor punching body.

[0015] Preferably, a plurality of outer positioning grooves are formed in an annular array on the outer surface of the rotor punching body, and the number of the outer positioning grooves is three or four times the number of the bar groove groups.

[0016] Preferably, the depth and width dimensions of the groove on the inner wall of the central shaft hole and the anti-fooling groove can both cooperate with the key on the motor shaft, and an inner concave clamping groove that cooperates with the convex portion is formed on the motor shaft.

[0017] Beneficial effects

[0018] The present utility model provides a rotor punching, having the following beneficial effects:

[0019] 1. For this rotor punching, by providing a convex portion, a groove, and an anti-fooling groove on the inner wall of the central shaft hole, not only the recognition is improved, which facilitates the accurate installation of the rotor punching body, but also the damage of the key and the groove caused by the installation misalignment is effectively avoided, and at the same time, the installation firmness of the rotor punching body is improved.

[0020] 2. For this rotor punching, by providing bar groove groups, since the bar grooves are not communicated with the outside, the circular structure of the rotor punching body will not be damaged. While reducing the weight of the rotor punching body, the structural strength of the rotor punching body is not affected. Moreover, by reducing the weight of the rotor punching body, the moment of inertia can be reduced, making the motor respond faster, especially suitable for occasions that require frequent start and stop.

[0021] 3. For this rotor punching, by providing heat dissipation holes, ventilation can be carried out to help the motor dissipate heat during operation, so as to keep the working temperature of the motor within a reasonable range and prevent damage due to overheating. Moreover, the kidney-shaped heat dissipation holes can be used to reduce eddy current loss and improve the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic top view of a rotor punching sheet proposed by the present utility model;

[0023] Figure 2 FIG. 2 is a schematic enlarged view of A in a rotor punching sheet proposed by the present utility model; Figure 1

[0024] Figure 3 FIG. 3 is a schematic enlarged view of B in a rotor punching sheet proposed by the present utility model; Figure 1

[0025] Figure 4 FIG. 4 is a schematic front view of a rotor punching sheet proposed by the present utility model.

[0026] In the figure: 1, rotor punching sheet body; 2, guide bar groove group; 3, central shaft hole; 4, protrusion; 5, groove; 6, anti-fooling groove; 7, first guide bar groove; 8, second guide bar groove; 9, third guide bar groove; 10, heat dissipation hole; 11, protrusion block; 12, outer positioning groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] Please refer to Figures 1-4 , the present utility model provides a technical solution: a rotor punching sheet, including a rotor punching sheet body 1, a plurality of guide bar groove groups 2 are provided on the surface of the rotor punching sheet body 1, a central shaft hole 3 is provided at the central position of the rotor punching sheet body 1, a protrusion 4 is provided on the inner wall of the central shaft hole 3, a groove 5 is provided at the connection between the protrusion 4 and the central shaft hole 3, and an anti-fooling groove 6 is further provided on the inner wall of the central shaft hole 3. The protrusion 4 is square in shape, and a chamfer is provided at the corner of the protruding part of the protrusion 4. By providing the protrusion 4, the groove 5 and the anti-fooling groove 6 on the inner wall of the central shaft hole 3, not only the recognition degree is improved, which provides convenience for the accurate installation of the rotor punching sheet body 1, but also the damage of the key and the groove caused by the installation misalignment is effectively avoided, and at the same time, the installation firmness of the rotor punching sheet body 1 is improved.

[0029] ​​The number of the bar slot groups 2 is eight, and the bar slot groups 2 are distributed in an annular array on the surface of the rotor punching body 1. By setting the bar slot groups 2, since the bar slots are not connected to the outside, the circular structure of the rotor punching body 1 will not be damaged. While reducing the weight of the rotor punching body 1, the structural strength of the rotor punching body 1 is not affected. Moreover, by reducing the weight of the rotor punching body 1, the moment of inertia can be reduced, making the motor respond faster, especially suitable for occasions that require frequent starting and stopping.

[0030] The bar slot group 2 includes a first bar slot 7, a second bar slot 8 and a third bar slot 9. The two ends of the first bar slot 7 have the same shape, and the second bar slot 8 and the third bar slot 9 have the same shape. The first bar slot 7, the second bar slot 8 and the third bar slot 9 enclose a triangle, and the second bar slot 8 and the third bar slot 9 are symmetric about the central axis of the first bar slot 7. The bar, which is part of the rotor winding, is placed through the first bar slot 7, the second bar slot 8 and the third bar slot 9. The triangular-designed bar slot group 2 helps to isolate the bar from the rotor core and other bars, thereby reducing eddy current loss and short-circuit risk.

[0031] The shape of the anti-fooling slot 6 can be semicircular, trapezoidal or square. By setting the anti-fooling slot 6, the reverse installation of the rotor punching body 1 can be effectively avoided.

[0032] Eight heat dissipation holes 10 are formed in an annular array on the surface of the rotor punching body 1, and the shape of the heat dissipation holes 10 is kidney-shaped. By setting the heat dissipation holes 10, ventilation can be carried out to help the motor dissipate heat during operation, so as to keep the working temperature of the motor within a reasonable range and prevent damage due to overheating. Moreover, the kidney-shaped heat dissipation holes 10 can be used to reduce eddy current loss and improve the motor efficiency.

[0033] Eight convex blocks 11 are fixedly connected in an annular array on the surface of the rotor punching body 1, and a plurality of outer positioning grooves 12 are formed in an annular array on the outer surface of the rotor punching body 1. The number of the outer positioning grooves 12 is three or four times the number of the bar slot groups 2. By setting the convex blocks 11 and the outer positioning grooves 12, the installation and fixing effect of the rotor punching body 1 can be further improved.

[0034] The depth and width dimensions of the groove 5 and the anti-fooling slot 6 on the inner wall of the central shaft hole 3 can both cooperate with the key on the motor shaft, and an inner concave card slot that cooperates with the convex part 4 is formed on the motor shaft. This design can realize the positioning and fixing of the rotor punching body 1.

[0035] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0036] Finally, the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A rotor punching, comprising a rotor punching body (1), characterized in that: The surface of the rotor punch body (1) is provided with a plurality of guide bar groove groups (2), a central axis hole (3) is provided at the center of the rotor punch body (1), a protrusion (4) is provided on the inner wall of the central axis hole (3), a groove (5) is provided at the connection between the protrusion (4) and the central axis hole (3), and an anti-misalignment groove (6) is also provided on the inner wall of the central axis hole (3).

2. A rotor punching according to claim 1, characterized in that: The shape of the protruding portion (4) is square, and chamfers are arranged at the corners of the protruding portion of the protruding portion (4).

3. A rotor punching according to claim 1, characterized in that: The number of the guide bar groove groups (2) is eight, and the guide bar groove groups (2) are distributed in a ring array on the surface of the rotor punching body (1).

4. A rotor punching according to claim 3, characterized in that: The guide bar groove group (2) comprises a first guide bar groove (7), a second guide bar groove (8) and a third guide bar groove (9); the two ends of the first guide bar groove (7) are of the same shape; the second guide bar groove (8) and the third guide bar groove (9) are of the same shape; the first guide bar groove (7), the second guide bar groove (8) and the third guide bar groove (9) together form a triangle; and the second guide bar groove (8) and the third guide bar groove (9) are symmetrical about the central axis of the first guide bar groove (7).

5. A rotor punching according to claim 1, characterized in that: The shape of the fool-proof groove (6) can be semicircular, trapezoidal or square.

6. A rotor punching according to claim 1, characterized in that: The surface of the rotor punch body (1) is provided with eight heat dissipation holes (10) in a ring array, and the heat dissipation holes (10) are in the shape of a broad bean.

7. A rotor punching according to claim 1, characterized in that: The surface of the rotor punch body (1) is fixedly connected with eight protruding blocks (11) in an annular array.

8. A rotor punching sheet according to claim 4, characterized in that: The outer surface of the rotor punch body (1) is provided with a plurality of external positioning grooves (12) in an annular array, and the number of the external positioning grooves (12) is three or four times the number of the guide bar groove group (2).

9. A rotor punching according to claim 1, characterized in that: The depth and width of the groove (5) and the foolproof groove (6) on the inner wall of the central shaft hole (3) can cooperate with the key on the motor shaft, and the motor shaft is provided with an inner concave groove that cooperates with the protrusion (4).

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