Insulation end plate structure for preventing displacement of insulation paper and motor rotor

Abstract

The insulation end plate structure comprises an insulation end plate, the insulation end plate comprises an end plate main body and a plurality of end plate tooth parts arranged at the outer side of the end plate main body, the plurality of end plate tooth parts are uniformly distributed along the circumferential direction of the end plate main body, and a wire passing groove for a coil to pass through is formed between the adjacent end plate tooth parts. A shaft hole matched with a shaft is formed in the center of the end plate body, height difference exists between the inner side and the outer side of a notch in one end of the wire passing groove, the notch portion located on the inner side is higher than the notch portion located on the outer side, and the height difference exists between the inner side and the outer side of the notch of the wire passing groove, so that at the initial stage of winding, the turning position of an enameled wire cannot press insulation paper, and displacement of the insulation paper is prevented.

Description

Technical Field

[0001] This utility model relates to a motor rotor, and more particularly to an insulating end plate structure and a motor rotor that prevents the insulation paper from shifting. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. A common type of motor provides power through the relative motion of the stator and rotor. The rotor consists of a shaft and an iron core mounted on the shaft. Coils are wound around the iron core to form the armature. The coils are made of enameled wire, and an insulation layer is placed between the coils and the iron core to meet safety regulations.

[0003] For example, Chinese utility model patent CN221597522U discloses a rotor insulating end plate and a motor rotor that can gather coils, including a rotating shaft, a rotor core, coil insulating paper and two insulating end plates. The rotor core is fitted on the rotating shaft and has circumferentially evenly distributed winding slots. The two insulating end plates are respectively set on both sides of the rotor core and fitted on the rotating shaft. The insulating end plate includes an end plate body and several teeth set on the outside of the end plate body. The teeth are evenly distributed along the circumference of the end plate body, and a tooth groove is formed between adjacent teeth. The tooth groove corresponds one-to-one with the winding slot. The insulating paper is placed in each winding slot of the rotor core, and the two ends of the insulating paper are respectively inserted into the opposite tooth grooves on both sides. Enamelled wire passes through the winding slot and tooth groove to form a winding.

[0004] The length of the existing insulating paper is automatically controlled and cut by the equipment, resulting in a stable length. The rotor core is composed of multiple stacked sheets, which have a stacking coefficient and a certain height deviation. Therefore, the insulating paper may be higher or lower than the insulating end plate. In a conventional planar structure, when the insulating paper is higher than the insulating end plate, during the initial winding of the rotor winding, the turning point where the rotor winding passes around the insulating end plate will press on the insulating paper. The rotor winding that passes around will pull the insulating paper, causing the insulating paper to shift and become displaced. After the displacement, the creepage distance will not meet the design requirements, posing a safety risk. Furthermore, the displacement will cause the insulating paper to fail to provide protection, leading to high-voltage breakdown. Utility Model Content

[0005] Since the rotor core is composed of multiple stacked sheets with a certain overlap coefficient and height deviation, the insulating paper may be higher or lower than the insulating end plate. In a conventional planar structure, when the insulating paper is higher than the insulating end plate, during the initial winding of the rotor winding, the turning point where the rotor winding passes around the insulating end plate will press on the insulating paper. The rotor winding that passes around the insulating end plate will pull the insulating paper, causing the insulating paper to shift and become displaced. This utility model provides an insulating end plate structure and motor rotor that prevents the insulating paper from shifting.

[0006] The utility model discloses a technical scheme that solves the above technical problem is as follows: the technical scheme that the utility model solves above technical problem adopts: the insulating end plate structure of preventing insulation paper displacement, including insulating end plate, the insulating end plate includes end plate main part and sets up a plurality of end plate tooth parts of end plate main part outside, a plurality of end plate tooth parts evenly distribute along the circumference of end plate main part, and the overline slot for coil is formed between adjacent end plate tooth parts, the shaft hole that is cooperated with the shaft is seted up in the center of end plate main part, the inside and outside of the notch of overline slot one end has height difference, and the notch part of inside is higher than the notch part of outside.

[0007] The further preferred technical scheme of the utility model is as follows: the end plate main part and the part end plate tooth part of adjoining end plate main part are thickened, and the inside of the notch of the overline slot formed by the two adjacent end plate tooth parts and the end plate main part is higher than the outside.

[0008] The further preferred technical scheme of the utility model is as follows: the end plate tooth part is partially thickened, and the end plate tooth part forms the high area of inside and the low area of outside, and the high area and the low area are connected through the inclined plane.

[0009] The further preferred technical scheme of the utility model is as follows: the end plate tooth part is partially thickened, and the end plate tooth part forms the high area of inside and the low area of outside, and the high area and the low area are connected through the arc surface.

[0010] The further preferred technical scheme of the utility model is as follows: the end plate main part is circular.

[0011] The further preferred technical scheme of the utility model is as follows: the end of the end plate tooth part away from the end face of end plate main part is flush.

[0012] The further preferred technical scheme of the utility model is as follows: the end of the end plate tooth part away from the end face of end plate main part is flush.

[0013] The further preferred technical scheme of the utility model is as follows: the high place of the notch of inside is U-shaped.

[0014] Another subject: motor rotor, including rotor shaft, rotor core, insulation paper, commutator and the insulating end plate structure of preventing insulation paper displacement, the rotor core and the commutator are all set on the rotor shaft, and the outside of rotor core is equipped with a plurality of rotor tooth parts, and a plurality of rotor tooth parts evenly distribute along the circumference of rotor core, and the wire slot is formed between adjacent rotor tooth parts, and the insulating end plate is equipped with two, and two insulating end plates are arranged at the both ends of rotor core, and the overline slot on the insulating end plate corresponds to the wire slot on the rotor core one by one, and the insulation paper is arranged in the wire slot one by one, and two ends are inserted into the overline slot of both sides respectively, and the notch of the overline slot away from the rotor core has height difference, and the insulation paper is lower than the high place of the notch of overline slot, and the wire coil is wound on the wire slot and overline slot.

[0015] Compared with the prior art, the utility model has the advantages that the inner side and the outer side of the notch of one end of the wire slot have height difference, the notch part at the inner side is higher than the notch part at the outer side, when the enameled wire is wound into a coil to form a rotor winding by passing through the wire slot, the enameled wire is first wound from the inner side of the notch in the initial stage, so that the coil formed will not directly press on the insulation paper inserted into the wire slot, preventing the insulation paper from being displaced due to the coil turning in the initial stage of winding, when the enameled wire is wound to the low position of the notch in the later stage of winding, the enameled wire turning part contacts the insulation paper again, the insulation paper has been fixed by the coil wound previously, and is not easy to be displaced due to the coil turning, in addition, the notch is provided with high and low positions, so that the insulation end plate does not need to be thickened as a whole, avoiding the space between the commutator and the rotor core being reduced, and the length of the enameled wire wound will be increased due to the insulation end plate being thickened as a whole, so that the cost and weight of the rotor will be greatly increased. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be described in further detail below in combination with the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be regarded as a limitation on the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0017] Figure 1 Structure diagram of motor rotor Figure 1 ;

[0018] Figure 2 Structure diagram of motor rotor Figure 2 ;

[0019] Figure 3 A partial enlarged view of A of Figure 2 ;

[0020] Figure 4 Exploded view of motor rotor

[0021] Figure 5 Structure diagram of insulation end plate

[0022] Figure 6 Top view of insulation end plate

[0023] In the drawings: 1, rotor core; 2, commutator; 3, rotor shaft; 4, insulation paper; 5, insulation end plate; 6, coil; 7, inner notch part; 8, outer notch part; 9, rotor tooth part; 10, wire slot; 11, shaft core; 12, shaft sleeve; 13, end plate main body; 14, shaft hole; 15, end plate tooth part; 16, wire slot; 17, first notch; 18, inclined surface; 19, high position area; 20, low position area; 21, protruding part. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present application will be described in detail below with reference to the drawings. Those skilled in the art will appreciate that the description is merely descriptive and exemplary, and should not be interpreted as limiting the scope of protection of the present application.

[0025] It should be noted that similar reference numerals refer to similar items throughout the accompanying drawings, and once an item is defined in one drawing, it can not be further defined and explained in subsequent drawings.

[0026] Figures 1-6 As shown, the motor rotor comprises a rotor shaft 3, a rotor core 1, insulation paper 4, a commutator 2 and an insulation end plate 5, the rotor core 1 and the commutator 2 are sleeved on the rotor shaft 3, the rotor core 1 is provided with a plurality of rotor tooth portions 9 on the outer side, the plurality of rotor tooth portions 9 are uniformly distributed along the circumference of the rotor core 1, and a winding slot 10 is formed between adjacent rotor tooth portions 9, the insulation end plate 5 is provided with two, the two insulation end plates 5 are arranged at the two ends of the rotor core 1, the insulation end plate 5 is provided with a wire passing groove 16 corresponding to the winding slot 10 one by one, the insulation paper 4 is arranged in the winding slot 10 one by one, and the two ends are respectively inserted into the wire passing grooves 16 on the two sides, and the winding slot 10 and the wire passing groove 16 are provided with a coil 6.

[0027] Figure 5 As shown, the insulation end plate 5 comprises an end plate body 13 and a plurality of end plate tooth portions 15 arranged on the outer side of the end plate body 13, the plurality of end plate tooth portions 15 are uniformly distributed along the circumference of the end plate body 13, and the wire passing groove 16 through which the coil 6 passes is formed between adjacent end plate tooth portions 15, the end plate body 13 is provided with a shaft hole 14 in the center for cooperation with the shaft, and the end plate body 13 is sleeved on the rotor shaft 3 through the central shaft hole 14. Preferably, the end plate body 13 is in the shape of a circular ring.

[0028] The rotor shaft 3 comprises a shaft core 11 and a shaft sleeve 12, and the shaft sleeve 12 is sleeved on the outside of the shaft core 11 and fixed with the shaft core 11.

[0029] Figure 3 、 Figure 5As shown, the overline slot 16 has a height difference between the inner side and the outer side of the first slot opening 17 at one end of the rotor core 1, the slot opening part 7 at the inner side is higher than the slot opening part 8 at the outer side, so that the inserted insulation paper 4 in the overline slot 16 is lower than the high position of the first slot opening 17, when the enameled wire is wound into the coil 6 through the overline slot 16 to form the rotor winding, the enameled wire is first wound from the inner side of the first slot opening 17, so that the coil 6 formed does not directly press on the insulation paper 4 inserted into the overline slot 16, preventing the coil 6 from pressing on the insulation paper 4 at the initial stage of winding, causing the insulation paper 4 to be displaced, when the enameled wire is wound at the later stage, the enameled wire is wound to the low position of the first slot opening 17, at this time, the enameled wire is contacted by the insulation paper 4, the insulation paper 4 has been fixed by the previously wound coil 6, and is not easily displaced due to the coil 6 pressing on it, in addition, the slot opening is provided with high and low positions, so that the insulation end plate 5 does not need to be thickened as a whole to reserve the space for the length deviation of the rotor core 1, avoiding the space between the commutator 2 and the rotor core 1 to be reduced, the insulation end plate 5 being thickened as a whole will increase the length of the enameled wire wound, thereby greatly increasing the cost and weight of the rotor.

[0030] The end plate body 13 and the part of the end plate tooth part 15 adjacent to the end plate body 13 are thickened, so that the inner side of the first slot opening 17 at one end of the overline slot 16 enclosed by the adjacent two end plate tooth parts 15 and the end plate body 13 is higher than the outer side, by thickening the end plate body 13 and the part of the end plate tooth part 15 at the inner side, the space between the commutator 2 and the rotor core 1 can be kept as much as possible on the basis of reserving the space for the length deviation of the rotor core 1, and the length of the enameled wire wound can also be reduced, thereby the cost and weight will not be increased too much.

[0031] In addition, the part of the end plate tooth part 15 is thickened, so that the end plate tooth part 15 forms the high position area 19 at the inner side and the low position area 20 at the outer side, and the high position area 19 and the low position area 20 are connected by the inclined surface 18. Or the high position area 19 and the low position area 20 can also be connected by the arc surface.

[0032] The high position area 19 and the low position area 20 are connected by the inclined surface 18 or the arc surface, so that the position transition between the high position area 19 and the low position area 20 is smoother, preventing the angle formed by the height difference from contacting the wound coil 6, causing the coil 6 to be damaged.

[0033] The thickened part of the end plate tooth part 15 is flush with the end surface of the end plate body 13, so that the connection between the end plate tooth part 15 and the end plate body 13 is flat without an angle, preventing the angle from contacting the wound coil 6, causing the coil 6 to be damaged, and being more convenient for processing, only the height difference of the end plate tooth part 15 needs to be processed.

[0034] Figure 6 As shown, preferably, the high position of the first slot opening 17 at the inner side is U-shaped, the U-shaped slot opening part can ensure that the enameled wire is wound from the high position of the first slot opening 17 at the initial stage of winding.

[0035] The end plate tooth portion 15 is provided with a protruding protrusion 21 on the outer end away from the end plate body 13, which gathers the coils 6 of the winding on the inner side.

[0036] The structure of the insulation end plate and the motor rotor are introduced above, the principle and the implementation mode of the utility model are described by applying specific examples in this paper, the above embodiment is only used for helping understanding the utility model and the core thought. It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claim.

Claims

1. An insulation end plate structure for preventing insulation paper displacement, comprising an insulation end plate, the insulation end plate comprising an end plate main body and a plurality of end plate tooth portions provided on the outer side of the end plate main body, the plurality of end plate tooth portions being uniformly distributed along the circumference of the end plate main body, a wire passage being formed between adjacent end plate tooth portions for a coil to pass through, and a shaft hole being formed in the center of the end plate main body for cooperating with a shaft, characterized in that, The inner and outer sides of the notch at one end of the wire slot have a height difference, and the notch part on the inner side is higher than the notch part on the outer side.

2. The insulation end plate construction which prevents displacement of the insulation paper according to claim 1, characterized by The end plate body and the part of the end plate tooth part adjacent to the end plate body are thickened, so that the inner side of the notch at one end of the wire slot enclosed by the two adjacent end plate tooth parts and the end plate body is higher than the outer side.

3. The insulation end plate construction which prevents displacement of the insulation paper according to claim 2, characterized by The end plate tooth part is partially thickened, so that the end plate tooth part forms a high position area on the inner side and a low position area on the outer side, and the high position area and the low position area are connected by a slope.

4. The insulation end plate construction which prevents displacement of the insulation paper according to claim 2, characterized by The end plate tooth part is partially thickened, so that the end plate tooth part forms a high position area on the inner side and a low position area on the outer side, and the high position area and the low position area are connected by a curved surface.

5. The insulation end block construction of claim 1, wherein, The end plate body is in the shape of a circular ring.

6. The insulation end plate construction which prevents displacement of the insulation paper according to claim 2, characterized by The thickened part of the end plate tooth part is flush with the end surface of the end plate body.

7. The insulation end plate construction which prevents displacement of insulation paper according to claim 1, wherein The outer end of the end plate tooth part away from the end plate body is provided with a protruding protruding part.

8. The insulation end plate construction which prevents displacement of insulation paper according to claim 1, wherein The high position of the notch on the inner side is in the shape of a U.

9. An electric machine rotor, characterised in that The structure comprises a rotor shaft, a rotor core, insulation paper, a commutator, and the insulation end plate structure of any one of claims 1-8, the rotor core and the commutator are sleeved on the rotor shaft, the outer side of the rotor core is provided with a plurality of rotor tooth parts, the plurality of rotor tooth parts are uniformly distributed along the circumference of the rotor core, the adjacent rotor tooth parts form a wire slot, two insulation end plates are provided, the two insulation end plates are arranged at the two ends of the rotor core, the wire slots on the insulation end plates correspond to the wire slots on the rotor core one by one, the insulation paper is arranged in the wire slots one by one, and the two ends are inserted into the wire slots on the two sides, the notch at one end of the wire slot away from the rotor core has a height difference, the insulation paper is lower than the high position of the notch of the wire slot, and coils are wound on the wire slots and the wire slots.

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