Brushless DC motor with improved grounding structure
阅读说明:本技术 具有改进接地结构的无刷直流电机 (Brushless DC motor with improved grounding structure ) 是由 李京柱 梁玹诚 姜玟硕 于 2019-03-14 设计创作,主要内容包括:本发明的无刷直流电机包括:壳体(10),内部含有定子(15),并具有中空部(11),耦合到轴(21)的转子(20)位于上述中空部(11)的中间部分;上轴承(22),耦合到轴(21)的输出侧,以旋转方式支撑上述轴;上轴承盖(31),容纳上述上轴承(22),并覆盖上述中空部(11);下轴承(23),耦合到上述轴(21)的下端,以旋转方式支撑上述轴;下轴承座(32),容纳上述下轴承(23),并耦合到从上述壳体(10)的中下部;第一接地构件(50),其上端部(50a)弯曲耦合到上述上轴承盖(31)的外部,其下端部(50b)耦合到下轴承座(32)的中间部分,使上述上轴承盖(31)与上述下轴承座(32)达到等电位。(The brushless DC motor of the present invention comprises: a housing (10) containing a stator (15) therein and having a hollow portion (11), a rotor (20) coupled to a shaft (21) being located at a middle portion of the hollow portion (11); an upper bearing (22) coupled to an output side of the shaft (21) to rotatably support the shaft; an upper bearing cover (31) that houses the upper bearing (22) and covers the hollow portion (11); a lower bearing (23) coupled to a lower end of the shaft (21) to rotatably support the shaft; a lower bearing housing (32) accommodating the lower bearing (23) and coupled to a middle-lower portion of the housing (10); and a first grounding member (50) having an upper end portion (50a) bent to be coupled to an outer portion of the upper bearing cap (31) and a lower end portion (50b) coupled to a middle portion of the lower bearing housing (32) such that the upper bearing cap (31) and the lower bearing housing (32) are equipotential.)
1. A brushless dc motor comprising:
a housing (10) containing a stator (15) therein and having a hollow portion (11), a rotor (20) coupled to a shaft (21) being located at a middle portion of the hollow portion (11);
an upper bearing (22) coupled to an output side of the shaft (21) to rotatably support the shaft;
an upper bearing cover (31) that houses the upper bearing (22) and covers the hollow portion (11);
a lower bearing (23) coupled to a lower end of the shaft (21) to rotatably support the shaft;
a lower bearing housing (32) accommodating the lower bearing (23) and coupled to a middle-lower portion of the housing (10); and
and a first grounding member (50) having an upper end portion (50a) bent to be coupled to an outer portion of the upper bearing cap (31) and a lower end portion (50b) coupled to a middle portion of the lower bearing housing (32) such that the upper bearing cap (31) and the lower bearing housing (32) are equipotential.
2. The brushless dc motor according to claim 1, wherein the first grounding member (50) is located on a first groove (13), and the first groove (13) is formed to connect an upper surface, a side surface, and a bottom surface of the housing (10).
3. The brushless dc motor according to claim 1, further comprising a first grounding member (50) on the housing side surface; and a second grounding member (51) electrically contacting the core of the stator (15) through a side surface of the first grounding member (50).
4. The brushless dc motor according to claim 1, wherein the lower end portion (50b) has a curved shape, and the end portion of the curved shape is interposed between the lower bearing (23) and the lower bearing housing (32).
5. The brushless dc motor according to claim 1, wherein the lower bearing housing (32) is coupled to an inner side of a lower protrusion (14), the lower protrusion (14) protruding downward in a direction of the housing (10).
6. The brushless DC motor according to claim 5, wherein the lower end (50b) of the first grounding member (30) leads to a second groove (14a), said second groove (14a) being formed on said lower protrusion (14).
7. The brushless dc motor according to claim 1, wherein a lower end portion (50b) of the first grounding member (30) is coupled to a third groove (32a), the third groove (32a) being formed on the lower bearing housing (32).
Technical Field
The present invention relates to a grounding structure of an electric machine. More particularly, the present invention relates to a motor having a ground structure, which can more effectively prevent electrolytic corrosion of bearings by improving the ground structure, improve performance and durability, and have characteristics of small vibration and low noise.
Background
Generally, an electric machine includes a stator and a rotor. The rotor rotates under the influence of the magnetic field formed by the stator. A shaft coupled to and rotating with the rotor has bearings for supporting rotation of the shaft mounted on the upper and lower portions of the rotor.
Typically, such motors are controlled by a drive circuit. When the driving circuit is operated, electrolytic corrosion of the bearings occurs due to a potential difference between the upper and lower bearings or an axial current generated due to another cause. When the motor operates under electrolytic corrosion, noise and vibration are generated, which seriously affect the performance and durability of the motor.
In order to prevent electrolytic corrosion of a bearing, korean patent laid-open publication No. 10-2008-0109168 discloses a technique for preventing electrolytic corrosion of a bearing, in which an output side bracket surrounding an upper bearing and an opposite output side bracket surrounding a lower bearing are connected by a conductive cloth tape so that potentials at both sides are equalized. However, the member for fixing the end of the conductive cloth tape is structurally weak, and thus there may be a problem in maintaining the allelism.
Meanwhile, korean patent No. 10-1562736 discloses a structure in which a metal member for grounding is installed outside a motor case so that upper and lower ends of the metal member for grounding are directly connected to an upper bearing cap and a lower bearing cap. In the prior art, an effective ground connection is made between the upper and lower bearing caps, but since it has a structure in which the bearings are inserted to the outside of the upper and lower bearing caps, the two bearings are easily exposed to the outside. In particular, due to the structure in which one end of the metal member for grounding is in light contact with the lower bearing cap, the grounding member is likely to be isolated, and thus there may be a problem in that electrolytic corrosion of the bearing cannot be effectively prevented.
In this respect, in order to solve the above-mentioned problems, the present inventors have proposed a motor having an improved grounding structure not proposed in the prior art.
Disclosure of Invention
Technical problem
It is an object of the present invention to provide an electric machine with an improved grounding structure.
Another object of the present invention is to provide a motor capable of more effectively preventing electrolytic corrosion of a bearing by effectively maintaining allelism between an upper bearing and a lower bearing by simultaneously contacting a lower bearing cover and a grounding member structure of the bearing.
The above objects and other inherent objects of the present invention can be easily achieved by the present invention as hereinafter explained.
Technical scheme
The brushless DC motor of the present invention comprises:
a
an upper bearing 22 coupled to an output side of the
an upper bearing cover 31 for accommodating the upper bearing 22 and covering the hollow portion 11;
a
a lower bearing
the
In the present invention, the
In the present invention, the brushless dc motor may further include a
In the present invention, it is preferable that the
In the present invention, it is preferable that the lower bearing
In the present invention, it is preferable that the
In the present invention, it is preferable that the
ADVANTAGEOUS EFFECTS OF INVENTION
The invention has the advantages that the allelism between the upper bearing and the lower bearing is effectively maintained through the novel structure of the grounding component which simultaneously contacts the lower bearing cover and the bearing, thereby more effectively preventing the electrolytic corrosion of the bearing.
Drawings
Fig. 1 is an exploded view of an electric machine according to the present invention;
FIG. 2 is an exploded schematic view of a motor according to the present invention;
FIG. 3 is a bottom exploded schematic view of a motor according to the present invention;
FIG. 4 is a bottom exploded view of the motor according to the present invention;
fig. 5 is an exploded schematic view of a grounding structure of a lower bearing cap of the motor according to the present invention; and is
Fig. 6 is a cross-sectional view taken along line a-a' of fig. 1.
The present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
Fig. 1 is an exploded view of the above-described motor 100 according to the present invention; fig. 2 is an exploded view of the motor 100 according to the present invention; fig. 3 is a bottom exploded schematic view of the above-described motor 100 according to the present invention.
As can be seen from fig. 1 to 3, the motor 100 according to the present invention may include a
The
The
The rotor 20 includes a magnet positioned facing the stator. The
The upper bearing cap 31 is coupled to cover the hollow portion 11 of the
The
FIG. 4 is a bottom exploded view of the electric machine 100 according to the present invention; fig. 5 is an exploded view of the grounding structure of the
Referring to fig. 4 and 6, the
The
As shown in fig. 4, the
As shown in fig. 6, a curved portion at the end of the
The description of the present invention provided above is intended only to provide examples to aid understanding of the present invention and is not intended to limit the scope of the present invention. The description of the present invention should be defined by the appended claims, and it should be noted that simple modifications or changes made to the present invention within the scope of the claims belong to the invention claimed in the present invention.
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