CN209766809U - A sawtooth type commutator piece and commutator - Google Patents

Abstract

The utility model provides a sawtooth pattern commutator segment, it is rectangular form copper bar, its including be used for with the sliding part of carbon brush contact and with the gomphosis portion of commutator bakelite main part looks gomphosis, gomphosis portion both sides are equipped with the multislot body combination that the cross-section becomes sawtooth pattern respectively, the length direction of the single cell body is parallel with commutator segment length direction in the multislot body combination, the groove maximum depth degree of depth of multislot body combination is 1/8-1/5 of the outer arc length of commutator segment. The combination of multislot body sets up in commutator segment gomphosis portion both sides uniformly, has improved the cohesion of commutator segment with the bakelite main part greatly, and the commutator segment position is more firm, and when the motor is high-speed rotatory, the shearing force that the commutator segment received is by homodisperse, prevents that local atress is too big, and the segment interval of commutator segment is poor when reducing the operation, has promoted the whole mechanical properties of commutator.

Description

A sawtooth type commutator piece and commutator

technical field

The utility model relates to a sawtooth type commutator piece and a commutator.

Background technique

The commutator is the main part of the motor, which is mainly composed of commutator pieces and bakelite main body. The commutating piece is fixed in the bakelite main body, and the pulling force of the bakelite main body on the commutating piece offsets the centrifugal force of the commutating piece during high-speed rotation.

At present, high-efficiency motors require that the commutator can withstand higher speeds, so there are higher requirements for the destructive rotation test of the commutator. The strength of the existing structure of the commutator can no longer meet the high-speed performance of high-efficiency motors. , so it is necessary to design a stronger commutator to meet the increasing requirements of customers.

Utility model content

In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide a saw-tooth type commutator segment and a commutator.

In order to achieve the above purpose, the technical solution adopted by the utility model to solve the technical problem is: a zigzag commutator piece, which is a long strip copper bar, which includes a sliding part for contacting with the carbon brush and a commutator The fitting part where the main body of the bakelite is fitted, the two sides of the fitting part are respectively provided with a multi-slot body combination with a zigzag cross-section, and the length direction of the single-slot body in the multi-slot body combination is the same as the length of the commutator segment. The directions are parallel, and the maximum depth of the grooves of the multi-groove combination is 1/8-1/5 of the length of the outer arc of the commutator segment.

Compared with the prior art, the utility model has a combination of multi-groove bodies evenly arranged on both sides of the interlocking part of the reversing piece, which greatly improves the bonding force between the reversing piece and the main body of the bakelite, and the position of the reversing piece is more stable. When the motor rotates at a high speed, the shear force on the commutator segments is evenly dispersed to prevent excessive local stress, reduce the segment difference between the commutator segments during operation, and improve the overall mechanical performance of the commutator. The groove direction is set along the length direction of the commutator segment, and the structure of the groove body is directly formed during extrusion molding, eliminating the need for subsequent separate stamping processes, and the manufacturing process of the commutator segment is simpler and saves costs.

Further, the cross-section of a single tank of the combination of multiple tanks is triangular.

Further, the multi-groove combination is composed of a plurality of deep grooves and a plurality of shallow grooves at intervals, and the depth of the shallow grooves is 1/3-1/2 of the depth of the deep grooves.

By adopting the above preferred scheme, the fluidity of the bakelite powder between multiple tanks during filling can be improved, and the fullness of the bakelite powder filling can be improved.

Further, the multi-slot combination is composed of a plurality of isosceles trapezoidal slots.

By adopting the above preferred scheme, the filling amount of bakelite powder in the slot of the commutator plate is increased, and the bonding force between the commutator plate and the bakelite powder is improved.

Further, at least one side of the sliding part is provided with a concave groove body, the position of the groove body corresponds to the maximum wear allowed by the commutator segment, and the groove body is filled with rubber that rubs against the carbon brush to generate abnormal noise Pronunciation body.

With the above preferred solution, when the commutator reaches a certain service life, the commutator plate is worn to the sounding body, and the friction between the carbon brush and the rubber sounding body produces a prompt sound, which reminds the motor to be repaired and replaced in time.

A commutator includes a plurality of the above-mentioned sawtooth-type commutator pieces, and the sawtooth-type commutator pieces are uniformly embedded in a bakelite main body.

With the above-mentioned preferred scheme, when the motor rotates at high speed, the shear force on the commutator segment is evenly dispersed to prevent excessive local force, reduce the segment difference between the commutator segments during operation, and improve the overall mechanical strength of the commutator. performance.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural representation of an embodiment of the utility model commutator segment;

Fig. 2 is a schematic cross-sectional view of an embodiment of the commutator segment of the present invention;

Fig. 3 is a schematic cross-sectional view of another embodiment of the commutator segment of the present invention;

Fig. 4 is a structural schematic diagram of the utility model commutator.

Names of corresponding parts indicated by numbers and letters in the figure:

1-commutator piece; 11-sliding part; 12-fitting part; 121-multi-slot body combination; 1211-deep groove; 1212-shallow groove; 13-rubber sounding body; 2-bakelite main body.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figures 1 and 2, a zigzag commutator piece 1 is a strip-shaped copper bar, which includes a sliding part 11 for contacting with a carbon brush and an embedding part fitted with the commutator Bakelite body. The joint part 12 and the two sides of the fitting part 12 are respectively provided with a multi-groove combination 121 with a zigzag cross-section. The length direction of the single groove body in the multi-groove combination 121 is parallel to the length direction of the commutator segment. The maximum depth d of the slot is 1/8-1/5 of the length l of the outer arc of the commutator segment.

The beneficial effect of adopting the above-mentioned technical solution is: the multi-groove combination is evenly arranged on both sides of the commutator piece fitting part, which greatly improves the bonding force between the commutator piece and the bakelite main body, and the position of the commutator piece is more stable. When rotating at high speed, the shear force on the commutator segments is evenly dispersed to prevent excessive local stress, reduce the segment difference between the commutator segments during operation, and improve the overall mechanical performance of the commutator.

As shown in Figure 3, in other embodiments of the present utility model, the cross-section of a single tank of the multi-tank combination 121 is triangular; The depth of the shallow groove 1212 is 1/3-1/2 of the depth of the deep groove 1211. The beneficial effect of adopting the above technical solution is that it can improve the fluidity of the bakelite powder among multiple tanks during filling, and improve the filling degree of the bakelite powder.

In some other embodiments of the present utility model, the multi-slot combination is composed of a plurality of isosceles trapezoidal slots. The beneficial effect of adopting the above technical solution is to increase the filling amount of bakelite powder in the slot of the commutator segment and increase the bonding force between the commutator segment and the bakelite powder.

As shown in Figure 3, in some other embodiments of the present invention, at least one side of the sliding part 12 is provided with a recessed groove, and the position of the groove corresponds to the maximum wear allowed by the commutator segment. The body is filled with the rubber sounding body 13 which can produce abnormal sound by friction with the carbon brush. The beneficial effect of adopting the above technical solution is: when the commutator is used to a certain life, the commutator plate is worn to the sounding body, and the carbon brush rubs against the rubber sounding body 13 to generate a prompt sound, which reminds the motor to be repaired and replaced in time.

As shown in FIG. 4 , a commutator includes a plurality of the above-mentioned sawtooth-shaped commutator segments 1 , and the sawtooth-type commutator segments 1 are uniformly embedded in a bakelite main body 2 . The beneficial effect of adopting the above technical solution is: when the motor rotates at high speed, the shear force on the commutator segments is evenly dispersed, preventing excessive local stress, reducing the segment difference between the commutator segments during operation, and improving the commutation efficiency. overall mechanical properties.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present utility model. Equivalent changes or modifications made by the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (6)

1. A sawtooth type commutator segment is characterized by being a strip-shaped copper bar and comprising a sliding portion and an embedding portion, wherein the sliding portion is used for being in contact with a carbon brush, the embedding portion is embedded with a commutator bakelite main body, a multi-groove body combination with a sawtooth-shaped cross section is arranged on each of two sides of the embedding portion, the length direction of a single groove body in the multi-groove body combination is parallel to the length direction of the commutator segment, and the maximum depth of a groove of the multi-groove body combination is 1/8-1/5 of the length of an outer circular arc of the commutator segment.

2. The sawtooth type commutator segment as claimed in claim 1, wherein the cross section of the single slot body of the multi-slot body combination is triangular.

3. The zigzag commutator segment as claimed in claim 2, wherein the multi-groove combination is formed by combining a plurality of deep grooves and a plurality of shallow grooves at intervals, and the depth of the shallow grooves is 1/3-1/2 of the depth of the deep grooves.

4. The sawtooth type commutator segment as claimed in claim 1, wherein the multi-groove body combination is formed by combining a plurality of isosceles trapezoid grooves.

5. The sawtooth type commutator segment as claimed in claim 1, wherein at least one side surface of the sliding part is provided with an inward-concave groove body, the position of the groove body corresponds to the maximum wear position allowed by the commutator segment, and a rubber sounding body which can generate abnormal sound by friction with the carbon brush is filled in the groove body.

6. A commutator, characterized in that the commutator comprises a plurality of sawtooth-shaped commutator segments as claimed in any one of claims 1 to 5, and the sawtooth-shaped commutator segments are uniformly embedded in a bakelite body.