CN215120347U

CN215120347U - Magnetic ring assembly structure of miniature direct current motor

Info

Publication number: CN215120347U
Application number: CN202120270827.XU
Authority: CN
Inventors: 莫卫根; 王宽亮; 张洪军; 卢山
Original assignee: Dongguan Longlink Motor Technology Co ltd
Current assignee: Dongguan Longlink Motor Technology Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-12-10
Anticipated expiration: 2031-01-29

Abstract

The utility model discloses a miniature direct current motor's magnetic ring assembly structure, including casing and magnetic ring, the casing inner wall is provided with the muscle position, and this muscle position is at the convex arch of casing inner wall, and the magnetic ring forms interference fit with the arch after packing into in the casing for the magnetic ring dress is tight at the casing inner wall, and bellied quantity is provided with the dibit usually, and the distribution of symmetry is at the casing inner wall. The utility model discloses utilize arch and magnetic ring to produce interference fit, play the effect of fixed magnetic ring, guarantee the angle of the magnetic ring setpoint and the casing setpoint after magnetizing simultaneously, guaranteed the motoricity.

Description

Magnetic ring assembly structure of miniature direct current motor

Technical Field

The utility model relates to a direct current motor, specifically speaking are miniature direct current motor's magnetic ring assembly structure who mainly uses in fields such as image equipment, car product, domestic appliance, game machine class.

Background

The existing micro direct current motor generally comprises a rotor part, an end cover part and a stator part, wherein the rotor part comprises a commutator, a shaft core, an iron chip, a piezoresistor, a coil and other parts, the end cover part comprises an electric brush assembly, an oil-containing bearing, a cover plate and other parts, and the stator part comprises a shell, an oil-containing bearing, a magnetic ring and other parts.

From the perspective of a motor forming mechanism, the casing and the magnetic ring are matched in a clearance fit design, the matching has the advantages that the magnetic ring can be assembled in place by 100%, but the defect is that the angle between the positioning point of the magnetic ring and the positioning point of the casing after assembly cannot be ensured, and the structure is easy to cause poor motor performance because the angle between the positioning point of the magnetic ring and the positioning point of the casing is not in the design requirement.

The two parts are in clearance fit, and when the magnetic ring is carried and subjected to glue dispensing operation after assembly, the magnetic ring rotates relative to the casing, so that the magnetic poles of the magnetic ring cannot meet the design requirements. The performance parameters of the motor can be ensured to meet the design requirements only when the magnetic ring positioning point and the shell are positioned within the design angle. Otherwise, the bad conditions of large motor revolution and large current caused by the angle between the magnetic ring and the casing are not right.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a miniature direct current motor's magnetic ring assembly structure.

In order to solve the technical problem, the utility model discloses take following technical scheme:

a magnetic ring assembly structure of a miniature direct current motor comprises a casing and a magnetic ring, wherein rib positions are arranged on the inner wall of the casing and are protrusions protruding from the inner wall of the casing, and the magnetic ring is assembled in the casing in an interference fit mode with the protrusions, so that the magnetic ring is tightly assembled on the inner wall of the casing.

Further, the inner wall of the machine shell is provided with at least two bulges.

Furthermore, the bulges are symmetrically arranged on the inner wall of the machine shell.

Furthermore, the bulge is directly formed on the inner wall of the shell in an integrated mode.

Further, the protrusion height of the protrusion relative to the inner wall of the casing is 0.02-0.05 mm. The utility model discloses utilize arch and magnetic ring to produce interference fit, play the effect of fixed magnetic ring, guarantee the angle of magnetic ring setpoint and casing setpoint after magnetizing simultaneously, guaranteed the motor nature_，The problem of the bad in the aspect of the motor performance because of the bad magnetic ring angle has been improved.

Drawings

FIG. 1 is a schematic three-dimensional structure of the housing of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is a schematic sectional view taken along line A-A of FIG. 2;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

fig. 5 is a schematic side view of the assembled device of the present invention.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

As shown in fig. 1-5, the utility model discloses a miniature direct current motor's magnetic ring assembly structure, including casing 1 and magnetic ring 2, casing 1 inner wall is provided with the muscle position, and this muscle position is at the convex arch 3 of casing inner wall, and magnetic ring 2 packs into in casing 1 after magnetizing, then forms interference fit with the arch for the magnetic ring dress is tight at the casing inner wall, plays the effect of fixed magnetic ring, guarantees the angle of magnetic ring locating point and casing locating point after magnetizing simultaneously, has guaranteed motor performance.

The inner wall of the shell is provided with at least two bulges, and the number of the bulges is usually even, so that the bulges are symmetrically distributed on the inner wall of the shell, the installation is convenient, the stress is balanced, and the assembly is more firm.

Furthermore, the bulge is directly formed on the inner wall of the shell in an integrated mode. The inner wall of the shell is ribbed through a corresponding cutter, so that a part of the rib is recessed into the inner wall of the shell, and a part of the rib is protruded out of the inner wall of the shell, so that the installation is convenient.

Further, the protrusion height of the protrusion relative to the inner wall of the casing is 0.02-0.05 mm, and it is preferable to set the protrusion to 0.03 mm.

For the position setting of the bulge, the corresponding setting is usually carried out according to the assembly position of the casing and the magnetic ring, and the flexible design is carried out according to casings of different models along the axial position of the casing.

The independent bulges are arranged on the inner wall of the shell and are in interference assembly with the magnetized magnet, so that the requirement on the tolerance matching degree of the shell and the magnet ring is not high, the assembly problem of the circular shell and the magnet ring is solved, the poor positioning of the magnet ring after being installed in the shell can be effectively improved, and the yield of finished motors is improved.

It should be noted that the above is only a preferred embodiment of the present invention, and the present invention is not limited to the above, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments can be modified or some technical features can be replaced with equivalents, but any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic ring assembly structure of a miniature direct current motor comprises a casing and a magnetic ring and is characterized in that rib positions are arranged on the inner wall of the casing and are protrusions protruding from the inner wall of the casing, and the magnetic ring is assembled in the casing in an interference fit mode with the protrusions, so that the magnetic ring is tightly assembled on the inner wall of the casing.

2. The magnetic ring assembling structure of miniature DC motor according to claim 1, wherein the inner wall of said casing is provided with at least two protrusions.

3. The magnetic ring assembling structure of miniature DC motor according to claim 2, wherein the protrusions are symmetrically disposed on the inner wall of the housing.

4. A magnetic ring assembling structure of a micro dc motor according to claim 3, wherein the protrusions are directly formed integrally on the inner wall of the housing.

5. The magnetic ring assembling structure of miniature DC motor according to claim 4, wherein the protrusion height of said protrusion relative to the inner wall of the housing is 0.02-0.05 mm.