CN219163866U - Hollow cup motor commutator - Google Patents

Abstract

The utility model discloses a hollow cup motor commutator, which comprises a bakelite powder matrix, wherein the bakelite powder matrix comprises a cylindrical part and a chassis part which is positioned at the lower part of the cylindrical part and is integrally formed, and an inner hole is formed in the middle of the cylindrical part; the reversing piece is uniformly arranged around the circumference of the bakelite powder matrix, is L-shaped and comprises a vertical part and a horizontal part, wherein the vertical part is combined with the outer side wall of the cylindrical part, and part of the lower part of the vertical part and the horizontal part are positioned in the chassis part. The utility model can solve the problem that the external diameter of the hollow cup motor commutator can not be reduced in the prior art.

Description

Hollow cup motor commutator

Technical Field

The utility model relates to the field of motor commutators, in particular to a hollow cup motor commutator.

Background

The commutator of the existing hollow cup motor generally comprises bakelite powder and commutating pieces, the inner sides of the commutating pieces are provided with dovetail-shaped protruding parts, the dovetail-shaped protruding parts can be wrapped by the bakelite powder, so that the bonding strength between the commutating pieces and the bakelite powder can be ensured, but because of the existence of the dovetail-shaped protruding parts, the outer diameter of the whole commutator needs to be larger under the condition that the inner hole diameter of the bakelite powder is unchanged, the material consumption is larger, and the outer diameter is too large, so that the commutator is not beneficial to being used in the hollow cup motor.

Disclosure of Invention

The utility model provides a hollow cup motor commutator which can solve the problem that the outer diameter of the hollow cup motor commutator cannot be reduced in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the hollow cup motor commutator comprises a bakelite powder matrix, wherein the bakelite powder matrix comprises a cylindrical part and a chassis part which is positioned at the lower part of the cylindrical part and is integrally formed, and an inner hole is formed in the middle of the cylindrical part; the commutator segment is evenly arranged around the circumference of the bakelite powder matrix, the commutator segment is L-shaped and comprises a vertical part and a horizontal part, the vertical part is combined with the outer side wall of the cylindrical part, a part of the vertical part and the horizontal part is positioned in the chassis part, the lower part of the commutator segment is wrapped by the chassis part to ensure the bonding strength of the commutator segment and the bakelite powder matrix, so that the setting of the dovetail-shaped protruding part is omitted, the inner hole can be larger, and the outer diameter of the commutator can be smaller, and the problem that the outer diameter of the hollow cup motor commutator cannot be reduced in the prior art is solved.

Preferably, the inner side part of the vertical part of the reversing piece is embedded into the side wall of the cylindrical part, and a lower notch is formed between the adjacent reversing pieces when the bakelite powder matrix is subjected to injection molding, so that subsequent processing is not needed, and the vertical part and the cylindrical part have enough bonding strength.

Preferably, a circle of boss is arranged at the junction of the upper side of the chassis part and the column part, the vertical part is arranged in the upper end surface range of the boss, the chassis part can structurally strengthen the junction of the chassis part and the column part, and the wrapping area between the bakelite powder matrix and the reversing sheet can be increased.

Preferably, the bakelite powder matrix is made of short glass fiber reinforced phenolic plastic, so that the defects of poor integrity, large centrifugal force and easiness in lug making of the traditional metal pressing ring type commutator can be overcome, and the electrical insulation performance of the commutator is improved.

Compared with the prior art, the utility model has the beneficial effects that:

the novel combination structure of the reversing piece and the bakelite powder is adopted, the lower part of the reversing piece is wrapped by the chassis part, so that the combination strength of the reversing piece and the bakelite powder matrix can be ensured, the setting of a dovetail-shaped protruding part is omitted, the inner hole can be made larger, the outer diameter of the reverser can be made smaller, and the problem that the outer diameter of the reverser of the hollow cup motor in the prior art cannot be reduced is solved.

Drawings

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a top view of the structure of the present utility model;

fig. 3 is a schematic view showing a structure for positioning a commutator segment by using a plastic shell in the production of the commutator of the present utility model.

Reference numerals:

1. the commutator segment comprises 11, a horizontal part, 12, a vertical part, 2, a bakelite powder matrix, 21, a chassis part, 22, a column part, 23, a boss, 3, an inner hole, 4, a plastic shell, 5 and a lower notch.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

As shown in fig. 1-3, the utility model provides the following technical scheme for solving the problem that the external diameter of the hollow cup motor commutator cannot be reduced in the prior art: in order to achieve the above purpose, the present utility model provides the following technical solutions: the hollow cup motor commutator comprises a bakelite powder matrix 2, wherein the bakelite powder matrix 2 comprises a cylindrical part 22 and a chassis part 21 which is positioned at the lower part of the cylindrical part 22 and is integrally formed, and an inner hole 3 is arranged in the middle of the cylindrical part 22; the commutator segment 1 is evenly arranged around the circumference of the bakelite powder matrix 2, the commutator segment 1 is L-shaped and comprises a vertical part 12 and a horizontal part 11, the vertical part 12 is combined with the outer side wall of a cylindrical part 22, a part of the lower part of the vertical part 12 and the horizontal part 11 is positioned in a chassis part 21, the lower part of the commutator segment 1 is wrapped by the chassis part 21 to ensure the bonding strength of the commutator segment 1 and the bakelite powder matrix 2, so that the setting of a dovetail-shaped protruding part is omitted, the inner hole 3 can be made bigger, and the outer diameter of the commutator can be made smaller, and the problem that the outer diameter of the hollow cup motor commutator in the prior art cannot be reduced is solved.

Specifically, the inner side of the vertical portion 12 of the commutator segment 1 is embedded into the side wall of the cylindrical portion 22, the lower notch 5 is formed between the adjacent commutator segments 1 when the bakelite powder matrix 2 is subjected to injection molding, subsequent processing is not needed, sufficient bonding strength is also provided between the vertical portion 12 and the cylindrical portion 22, during production, the commutator segments 1 are positioned and arranged by utilizing the plastic shell 4, then the bakelite powder matrix 2 and the commutator segments 1 are integrally molded, and the lower notch 5 between the commutator segments 1 is formed by utilizing the plastic shell 4.

After the plastic shell 4 is positioned, a mica sheet is not needed to be used for filling the lower positioning notch 5, so that the defects that the mica sheet is mechanically damaged in the pressing process, the glue is carbonized after high temperature due to high glue content, short circuit and spark jump among commutator sheets are easily caused are overcome.

Wherein, the cross section of the vertical part 12 of the reversing sheet 1 is isosceles trapezoid, and the cross section of the horizontal part 11 is rectangle, and the rectangle can improve the bonding strength with the bakelite powder matrix 2.

In order to improve the strength of the commutator, a circle of boss 23 is arranged at the junction of the upper side of the chassis part 21 and the column part 22, the vertical part 12 is arranged in the upper end surface range of the boss 23, the chassis part 21 can structurally strengthen the junction of the chassis part 21 and the column part 22, and the wrapping area between the bakelite powder matrix 2 and the commutator segment 1 can be increased.

Wherein, bakelite powder base member 2 be by short glass fiber reinforced phenolic plastic makes, can overcome traditional metal clamping ring formula commutator wholeness poor, centrifugal force is big, the shortcoming of easy lug, has improved the electric insulation performance of commutator simultaneously.

In this embodiment, the production process of the commutation of the present utility model is as follows:

s1, pulling and arranging: straightening copper bars used by the reversing sheet and drawing the copper bars into corresponding shapes;

s2, punching a reversing piece: cutting the straightened copper bar into sections, and punching to form two sections of straight strip-shaped reversing pieces with different shapes;

s3, bending the reversing piece: bending the straight strip-shaped reversing piece to form an L-shaped reversing piece

S4, arranging sheets: the plastic shell 4 is utilized to uniformly arrange the reversing pieces along the circumferential direction

S5, press forming: placing the arranged plastic shell 4 and the reversing pieces into a mould to press and form the bakelite powder matrix 2

S6, curing: solidifying the bakelite powder matrix 2, and removing the plastic shell 4

S7, numerical control boring: the inner bore 3 is machined.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims (4)

1. A coreless motor commutator comprising:

the bakelite powder comprises a bakelite powder matrix (2), wherein the bakelite powder matrix (2) comprises a cylindrical part (22) and a chassis part (21) which is positioned at the lower part of the cylindrical part (22) and is integrally formed, and an inner hole (3) is formed in the middle of the cylindrical part (22);

the reversing piece (1) is evenly arranged around the circumference of the bakelite powder matrix (2), the reversing piece (1) is L-shaped and comprises a vertical portion (12) and a horizontal portion (11), the vertical portion (12) is combined with the outer side wall of the cylindrical portion (22), and a part of the lower portion of the vertical portion (12) and the horizontal portion (11) is located in the chassis portion (21).

2. The coreless motor commutator of claim 1, wherein: the inner side part of the vertical part (12) of the reversing sheet (1) is embedded into the side wall of the cylindrical part (22).

3. The coreless motor commutator of claim 1, wherein: a circle of boss (23) is arranged at the junction of the upper side of the chassis part (21) and the cylindrical part (22), and the vertical part (12) is arranged in the upper end surface range of the boss (23).

4. The coreless motor commutator of claim 1, wherein: the bakelite powder matrix (2) is made of short glass fiber reinforced phenolic plastic.

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