Commutator segments that can be spliced ​​end to end

Abstract

A commutator segment that can be spliced ​​end-to-end includes a commutator segment body. One end of the commutator segment body has a raised platform on its upper side, and a copper foot is connected to its lower side via a connecting piece. A dovetail groove is provided on the end face of the commutator segment body near the raised platform. The horizontal edge of the dovetail groove is in the same horizontal plane as the upper surface of the commutator segment body, and the angle α between the hypotenuse and the horizontal edge is 75° to 85°. A convex surface is provided on the end face of the commutator segment body away from the raised platform, and the contour of the convex surface is consistent with the contour of the dovetail groove. When multiple commutator segments are produced and arranged, the material from cutting the dovetail groove of the previous commutator segment body is shaped into the convex surface of the next commutator segment. A stress relief groove is provided on the side wall of the commutator segment body, running through its length, and the bottom of the stress relief groove has an arc transition surface. This invention improves the high-speed rotation performance of the commutator through the dovetail groove structure, reduces production costs through the end-to-end splicing arrangement, and effectively disperses the stress generated by high-speed centrifugal force through the stress relief groove.

Description

Technical Field

[0001] This utility model relates to the field of commutator technology, and in particular to a commutator segment that can be spliced ​​end to end. Background Technology

[0002] The commutator is a crucial component of an electric motor, assembled from multiple commutator segments. A commutator segment typically includes the segment body, a riser, and copper feet. Currently, commutator segments are manufactured using independent punching or molding processes, resulting in low material utilization and high production costs. Furthermore, during high-speed rotation, the commutator segments are subjected to significant centrifugal forces, leading to cracks or even breakage of the segment body, affecting the commutator's lifespan and operational stability. In addition, traditional commutator segment connection structures often experience concentrated shear stress on a single cross-section when subjected to circumferential impact torque, making them prone to fragmentation. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies and provide a commutator that can be spliced ​​end to end, which improves material utilization, reduces production costs, and enhances the centrifugal stress resistance and torsional resistance of the commutator.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a commutator segment that can be spliced ​​end to end, including a commutator segment body, a raised platform provided on the upper side of one end of the commutator segment body, and a copper foot connected to the lower side of the commutator segment body through a connecting piece. A dovetail groove is recessed inward on the end face of the commutator segment body near the raised platform. The dovetail groove includes a horizontal side and a hypotenuse. The horizontal side is on the same horizontal plane as the upper surface of the commutator segment body, and the included angle α between the hypotenuse and the horizontal side is 75° to 85°. °; The commutator body has a convex surface protruding outward on the side away from the riser platform, and the outline of the convex surface is consistent with the outline of the dovetail groove; When multiple commutator bodies are produced and arranged, the material generated by cutting the rear end face of the previous commutator body to form the dovetail groove is shaped into the convex surface of the next commutator body; The side wall of the commutator body is provided with a stress relief groove extending along its length direction, and the bottom of the stress relief groove is provided with an arc transition surface, and the stress relief groove is provided through the length direction of the commutator body.

[0005] Preferably, the longitudinal section of the commutator body is an inverted isosceles trapezoidal structure, the included angle b between the two sides of the commutator body is 10° to 20°, the lower side of the commutator body is provided with a transition surface that connects to the side wall of the connecting piece, and the included angle c between the transition surfaces on both sides of the commutator body is 110° to 120°.

[0006] Preferably, the stress relief groove is disposed on the commutator body sidewall between the inclined side of the dovetail groove and the convex surface.

[0007] Preferably, the connecting piece has at least two fixing holes, and both ends of the connecting piece have U-shaped fixing grooves.

[0008] Preferably, the copper feet are provided with symmetrical slots on both sides, the length of the copper feet is the same as the length of the commutator body, the longitudinal section of the copper feet is trapezoidal, and the longitudinal section of the slots is parallelogram.

[0009] Preferably, the groove is located on the upper part of the copper foot.

[0010] The beneficial effects of this utility model are:

[0011] 1. In the dovetail groove structure, the horizontal side is on the same horizontal plane as the upper surface of the commutator body, and the inclined side is set at a specific angle, so that a dovetail-shaped mating structure is formed inside the raised platform end, which can improve the structural stability of the commutator when rotating at high speed.

[0012] 2. By adopting a head-to-tail splicing and layout method, the material removed from the dovetail groove of the previous commutator segment is directly used to form the convex surface of the next commutator segment, which greatly reduces material waste in the production process and can reduce product production costs by about 8%;

[0013] 3. Stress relief grooves are provided on the side wall of the commutator body, and a bottom structure with a rounded transition surface is adopted, so that the stress generated by high-speed centrifugal force can be effectively dispersed from the dovetail groove tip to the stress relief groove, avoiding stress concentration at the tip and improving the fatigue life of the commutator.

[0014] 4. The groove on the upper part of the copper foot can generate oblique resistance when subjected to circumferential impact torque, converting the torsional torque into uniform compressive stress on the commutator base rather than shear stress, thus avoiding the base from cracking due to shear stress concentration on a single cross section. Attached Figure Description

[0015] Figure 1 This is a front view of an embodiment of the present utility model;

[0016] Figure 2 This is a side view of an embodiment of the present utility model;

[0017] Figure 3 This is a diagram showing the state of the production layout of this utility model.

[0018] In the diagram: 1. Commutator body; 11. Transition surface; 2. Elevation platform; 3. Connecting piece; 31. Fixing hole; 32. Fixing groove; 4. Copper foot; 41. Setting groove; 5. Dovetail groove; 51. Horizontal edge; 52. Beveled edge; 6. Convex surface; 7. Stress relief groove; 71. Arc transition surface. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. Example

[0020] like Figures 1 to 3 The diagram shows a commutator segment that can be spliced ​​end to end, comprising a commutator segment body 1, a raised platform 2 on the upper side of one end of the commutator segment body 1, and a copper foot 4 connected to the lower side of the commutator segment body 1 via a connecting piece 3. The commutator segment body 1, the raised platform 2, the connecting piece 3, and the copper foot 4 can be manufactured using an integral molding process, and the material can be copper or a copper alloy.

[0021] The commutator body 1 has a dovetail groove 5 recessed inward on one end face near the lifting platform 2. The dovetail groove 5 includes a horizontal side 51 and a hypotenuse 52. The horizontal side 51 is in the same horizontal plane as the upper surface of the commutator body 1, and the angle α between the hypotenuse 52 and the horizontal side 51 is 75° to 85°. This angle range ensures effective fit between the dovetail groove and the convex surface, and also facilitates full utilization of material during layout. Preferably, the angle α between the hypotenuse 52 and the horizontal side 51 is 83°.

[0022] The commutator body 1 has a convex surface 6 protruding outward on the side away from the lifting platform 2. The contour of the convex surface 6 is consistent with the contour of the dovetail groove 5. The convex surface 6 is used to cooperate with the dovetail groove 5 of the adjacent commutator segments to realize the splicing and assembly between adjacent commutator segments.

[0023] When multiple commutator segments are produced and arranged, the material generated from cutting the dovetail groove 5 on the rear end face of the previous commutator segment body 1 is used to form the convex surface 6 of the next commutator segment. This end-to-end arrangement method makes full use of the cutting waste and significantly reduces material loss.

[0024] The commutator body 1 has a stress relief groove 7 extending along its length on its side wall. The bottom of the stress relief groove 7 has an arc-shaped transition surface 71, and the stress relief groove 7 extends through the commutator body 1 along its length. Preferably, the stress relief groove 7 is located on the side wall of the commutator body 1 between the inclined side 52 of the dovetail groove 5 and the convex surface 6. When the commutator rotates at high speed and generates centrifugal force, the stress can be dispersed into the stress relief groove 7 through the arc-shaped transition surface 71, effectively preventing stress concentration at the sharp corner of the dovetail groove.

[0025] The longitudinal section of the commutator body 1 is an inverted isosceles trapezoid. The included angle b between the two sides of the commutator body 1 is 10° to 20°. The lower side of the commutator body 1 is provided with a transition surface 11 that connects to the side wall of the connecting segment 3. The included angle c between the transition surfaces 11 on both sides of the commutator body 1 is 110° to 120°. This structure facilitates the assembly of multiple commutator segments into a ring-shaped commutator.

[0026] The connecting piece 3 has at least two fixing holes 31 for fixing the commutator segment to the base. Both ends of the connecting piece 3 have U-shaped fixing grooves 32 for easy positioning and installation.

[0027] The copper foot 4 has symmetrical slots 41 on both sides. The length of the copper foot 4 is the same as the length of the commutator body 1. The longitudinal section of the copper foot 4 is trapezoidal, and the longitudinal section of the slot 41 is parallelogram. The slot 41 is located on the upper part of the copper foot 4.

Claims

1. A commutator segment that can be spliced ​​end to end, comprising a commutator segment body (1), wherein a raised platform (2) is provided on the upper side of one end of the commutator segment body (1), and a copper foot (4) is connected to the lower side of the commutator segment body (1) via a connecting piece (3), characterized in that: The commutator body (1) has a dovetail groove (5) recessed inward on one end face near the riser platform (2). The dovetail groove (5) includes a horizontal side (51) and a hypotenuse (52). The horizontal side (51) is in the same horizontal plane as the upper surface of the commutator body (1), and the angle α between the hypotenuse (52) and the horizontal side (51) is 75° to 85°. The commutator body (1) has a convex surface (6) protruding outward on one end face away from the riser platform (2). The outline of the dovetail groove (5) is consistent with the outline of the dovetail groove (5); when multiple commutator segments are produced and arranged, the material generated by cutting the rear end face of the previous commutator segment body (1) to form the dovetail groove (5) is formed into the convex surface (6) of the next commutator segment; the side wall of the commutator segment body (1) is provided with a stress relief groove (7) extending along its length direction, the bottom of the stress relief groove (7) is provided with an arc transition surface (71), and the stress relief groove (7) is provided through the commutator segment body (1) along its length direction.

2. A commutating segment of a head-to-tail splicable layout according to claim 1, characterised in that: The longitudinal section of the commutator body (1) is an inverted isosceles trapezoidal structure. The included angle b between the two sides of the commutator body (1) is 10° to 20°. The lower side of the commutator body (1) is provided with a transition surface (11) that connects to the side wall of the connecting piece (3). The included angle c between the transition surfaces (11) on both sides of the commutator body (1) is 110° to 120°.

3. The end-to-end splicable lay of commutator segments according to claim 1, characterized in that: The stress relief groove (7) is located on the side wall of the commutator body (1) between the inclined side (52) of the dovetail groove (5) and the convex surface (6).

4. The end-to-end splicable die of claim 1, wherein: The connecting piece (3) has at least two fixing holes (31), and both ends of the connecting piece (3) have fixing grooves (32) in a U-shape.

5. The end-to-end splicable die of claim 1, wherein: The copper foot (4) has symmetrical slots (41) on both sides. The length of the copper foot (4) is the same as the length of the commutator body (1). The longitudinal section of the copper foot (4) is trapezoidal, and the longitudinal section of the slot (41) is parallelogram.

6. A commutator segment of a head-to-tail splicable layout according to claim 5, characterised in that: The setting groove (41) is located on the upper part of the copper foot (4).

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