Traction motor rotor

Abstract

The invention relates to the technical field of motors, in particular to a traction motor rotor, and mainly solves the technical problem that an existing rotor structure cannot meet the high rotating speed requirement of a dynamic set. The traction motor rotor comprises the iron core, the conducting bars, the end rings and the retaining rings, and a mode of full tensioning along the axial length of the iron core is adopted, so that the integration of the rotor is improved, and particularly, the rigidity of the part extending out of the iron core is improved; three conducting bars form a group to be bent, so that the risk of bar breakage can be reduced; and the end rings and the conducting bars are subjected to interference coating by adopting the protective rings, so that the integrity of the rotor is improved, and the overall rigidity is improved. Through the cooperation of the aspects, the reliability of high-speed operation of the rotor structure can be improved, so that the rotor structure can meet the high-rotating-speed requirement of a movable set.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a traction motor rotor. Background Art

[0002] With the development of the domestic railway network, both the high-speed railway network and the conventional railway network have become mature. Due to the limitations of the railway network system, there is a problem that high-speed and conventional railway trains cannot be connected, resulting in a large number of high-speed railway "detours". To solve this problem, the China Railway Group plans to develop a 200 km / h grade power-concentrated EMU (hereinafter referred to as EMU), which has the characteristics of 17 tons axle weight and high speed, and can travel on high-speed railways and conventional railways. It has a very obvious passenger transportation capacity improvement capacity for areas that can only be reached by conventional railways but cannot be reached by high-speed railways, and can also solve the problem of high-speed railway detours in some areas.

[0003] However, the rotor speed of the traction motor installed in the above-mentioned EMU is high, and its rotor linear speed is the highest among the traction motors of the current online locomotives. Due to the factors of vibration and centrifugal force, the high speed has higher requirements on the rotor structure. The existing rotor structure can no longer meet the requirements of its high speed, so it is necessary to optimize the design of the squirrel cage structure to improve the reliability of the rotor operation. Summary of the invention

[0004] In order to overcome the technical defect that the existing rotor structure cannot meet the high speed requirement of the moving set, the present invention provides a traction motor rotor.

[0005] The traction motor rotor provided by the present invention comprises: The core is formed by laminating a plurality of punching sheets, each of which is provided with punching sheet grooves; Conductive bars, which are provided in plurality and are all inserted into the punching sheet slots, the two ends of the conductive bars extending outward from the core and the portions of the conductive bars corresponding to the entire axial length of the core being tensioned, three adjacent conductive bars in the circumferential direction forming a group, and the ends of the conductive bars on both sides of the group being bent in a direction away from the middle conductive bar; Two end rings are provided and are respectively fixed at the two ends of the guide bar; The guard ring is provided with two and respectively corresponds to the two end rings. The guard ring is coaxial with the core and is arranged at the junction of the corresponding end ring and the guide bar. The inner wall of the guard ring is interference fit with the guide bar and the end ring.

[0006] Optionally, the fillet diameter of the punching groove is R1.5mm to R2mm.

[0007] Optionally, the maximum axial length of the end ring from the corresponding core end face is 65 mm to 70 mm.

[0008] Optionally, the inner wall of the guard ring is a stepped wall formed by a large diameter wall and a small diameter wall, and the large diameter wall is interference fit with the guide bar, and the small diameter wall is interference fit with the end ring.

[0009] The technical solution provided by the present invention has the following advantages compared with the prior art: The traction motor rotor provided by the present invention adopts a method of full tensioning along the axial length of the core, which is conducive to improving the integrity of the rotor, especially to improving the rigidity of the part extending out of the core; the guide bars are bent in groups of three to reduce the risk of broken bars; the end rings and guide bars are covered with a guard ring to improve the integrity of the rotor and the overall rigidity. The coordination of these aspects can improve the reliability of the high-speed operation of the rotor structure, so that the rotor structure can meet the high-speed requirements of the dynamic set. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 A cross-sectional view showing a traction motor rotor according to an embodiment of the present invention; Figure 2 express Figure 1 A partial enlarged view of the middle A; Figure 3 A schematic diagram showing the structure of a punching slot in an embodiment of the present invention; Figure 4 A schematic diagram showing the structure of the bending of the guide bar in an embodiment of the present invention.

[0013] In the figure: 1. Iron core; 11. Punching sheet; 12. Punching sheet groove; 2. Guide bar; 3. End ring; 4. Guard ring; 41. Large diameter wall; 42. Small diameter wall. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0015] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] Combine the following Figures 1 to 4 The specific embodiments of the present invention are described in detail.

[0017] This embodiment provides a traction motor rotor, including an iron core 1, a conductive bar 2, an end ring 3 and a guard ring 4.

[0018] The core 1 is formed by stacking a plurality of punching sheets 11 , and the punching sheets 11 are provided with punching sheet slots 12 .

[0019] Specifically, in this embodiment, the fillet diameter of the punching slot 12 is R1.5mm to R2mm, for example, R1.5mm or R1.8mm or R2mm. Compared with the existing conventional rotor, this embodiment increases the fillet of the punching slot 12, which can reduce the local stress of the punching sheet 11, enhance the fatigue resistance, extend the life of the punching sheet 11, and is more conducive to use in high-speed scenarios.

[0020] Among them, there are multiple conductor bars 2 and they are all inserted in the punching slots 12. Both ends of the conductor bars 2 extend outward from the core 1 and the conductor bars 2 corresponding to the entire axial length of the core 1 are tightened. Three adjacent conductor bars 2 in the circumferential direction are grouped together, and the ends of the conductor bars 2 on both sides of the same group are bent in a direction away from the middle conductor bar 2.

[0021] It should be noted that the present embodiment makes two improvements to the conductor bars 2: first, the entire axial length of the core 1 is fully tightened, which is beneficial to improving the integrity of the rotor, especially to improving the stiffness of the portion extending out of the core 1; second, three conductor bars 2 are bent as a group, which is beneficial to reducing the risk of broken bars.

[0022] It is easy to understand that tensioning is a relatively mature fastening method of the conductor bar 2 in the core 1 slot. The conductor bar 2 is fixed in the core 1 slot by causing plastic deformation of the top of the conductor bar 2 through external force to ensure the integrity of the rotor.

[0023] There are two end rings 3 which are fixed at two ends of the guide bar 2 respectively.

[0024] Specifically, in this embodiment, the maximum axial length of the end ring 3 from the end face of the corresponding core 1 is 65 mm to 70 mm, for example, 65 mm or 68 mm or 70 mm. Compared with the existing rotor structure, the cantilever length of the combined structure of the conductor bar 2 and the end ring 3 is shortened, which is conducive to reducing the pulsating stress of the conductor bar 2 during operation, thereby being more conducive to use in high-speed scenarios.

[0025] It is easy to understand that, since the end ring 3 has a certain thickness, the distance between it and the end face of the core 1 is within a range, and there is a maximum axial length and a minimum axial length.

[0026] There are two guard rings 4 which are respectively arranged corresponding to the two end rings 3 . The guard ring 4 is coaxial with the core 1 and is arranged at the joint between the corresponding end ring 3 and the guide bar 2 . The inner wall of the guard ring 4 is interference fit with the guide bar 2 and the end ring 3 .

[0027] Specifically, the inner wall of the retaining ring 4 of this embodiment is a stepped wall formed by a large diameter wall 41 and a small diameter wall 42, and the large diameter wall 41 is interference fit with the guide bar 2, and the small diameter wall 42 is interference fit with the end ring 3. The retaining ring 4 forms a double interference fit structure with the guide bar 2 and the end ring 3 through the large diameter wall 41 and the small diameter wall 42, which is conducive to improving the integrity of the rotor and the rigidity of the overall structure.

[0028] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A traction motor rotor, characterized in that: include: An iron core (1) is formed by laminating a plurality of punching sheets (11), wherein the punching sheets (11) are provided with punching sheet grooves (12); Conductive bars (2) are provided in plurality and are all inserted into the punching slots (12), both ends of the conductive bars (2) extend outward from the iron core (1), and the portion of the conductive bars (2) corresponding to the entire axial length of the iron core (1) is tensioned, three conductive bars (2) adjacent to each other in the circumferential direction form a group, and the ends of the conductive bars (2) on both sides of the group are bent in a direction away from the middle conductive bar (2); Two end rings (3) are provided and are respectively fixed at two ends of the guide bar (2); The guard ring (4) is provided with two and is respectively arranged corresponding to the two end rings (3); the guard ring (4) is coaxial with the iron core (1) and is provided at the junction of the corresponding end ring (3) and the guide bar (2); the inner wall of the guard ring (4) is interference fit with the guide bar (2) and the end ring (3).

2. The traction motor rotor according to claim 1, characterized in that: The rounded corner diameter of the punching slot (12) is R1.5 mm to R2 mm.

3. The traction motor rotor according to claim 1, characterized in that: The maximum axial length of the end ring (3) from the corresponding end face of the iron core (1) is 65 mm to 70 mm.

4. The traction motor rotor according to any one of claims 1 to 3, characterized in that: The inner wall of the guard ring (4) is a stepped wall formed by a large diameter wall (41) and a small diameter wall (42), and the large diameter wall (41) is interference fit with the guide bar (2), and the small diameter wall (42) is interference fit with the end ring (3).

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