KR20000059727A - Motor for Preventing a noise - Google Patents

Abstract

PURPOSE: A noise preventive motor is provided to reduce wearing of a brush and contact noise as well by simply modifying a design of a brush holder of a switching device. CONSTITUTION: The lower surface of the central part of a holder upper panel(332a) is cut to be inclined downward, and the upper surface of the central part of a holder lower panel(332b) is cut to be inclined upward. A brush holder(330) includes at least one through-holes(335a,335b) which implement tensioning function to adjacent areas to the central parts of the upper and lower panel(332a,332b) of the holder. The brush holder(330) has the through-holes(335a, 335b) and the inclined surfaces so that swaying of the brush due to rotation of a terminal piece(315) can be prevented and contact noise can be reduced.

Description

Motor for Preventing a Noise

The present invention relates to a control motor with a brush, and more particularly, to prevent noise that can reduce contact noise between a brush and a brush holder by improving a brush holder structure of a switching system using a rotational motion of the motor. It's about a motor.

Precision small motors for control are being used in a variety of applications such as sound equipment, imaging equipment, information equipment, office equipment, FA and industrial equipment, and automobile electric equipment, which are rapidly growing in recent years. Induction motors and direct current electric motors have contributed to industrial and economic development for nearly a century as a driving source for industrial machines. Motors and their products are in the same relationship as two wheels of a cart that cannot be separated from each other.

Advances in miniaturization, high performance, low cost, and diversification of such motors are remarkable to this day, and motors with new principles, new configurations, and functions will continue to be developed.

Brushless DC motors have contributed significantly to the development of the industry to this day as an important driving force in parallel with the production or induction motors. Since the elongation is proportional to GNP, it can be said that there is no prosperity today without a DC motor. On the other hand, induction motors are overwhelming because they are robust, inexpensive, and suitable for constant speed continuous operation.However, in the case of small motors, they have excellent controllability despite the shortcomings of brush life. The motor is used steadily.

FIG. 1 is a cross-sectional view schematically showing the structure of a motor using a general brush, and is largely composed of a rectifying system 10, an amateur core 20, and a switching system 30 around a rotating body 5.

The gist of the present invention relates to the switching system 30, the description of the rectifying system 10 and the amateur core 20 will be weak.

Referring to FIG. 2, which shows an enlarged view of the switching system 30 according to the related art, the switching system 30 includes a brush 32 formed on an outer circumferential surface of the conductive terminal 35 and a conductive portion in which the brush 32 is a contact object. The movement of the brush 32 in consideration of the wearability of the spring 34 and the brush 32 to perform a pressing role in the direction of the arrow so that the current is smoothly conducted by minimizing the contact resistance upon contact with the terminal 35 It is configured to include a brush holder 36 surrounding the brush to serve as a guide so that it can be desired.

The switching system 30 having such a configuration is characterized by the fact that the conductors are mutually contacted by instantaneous contact with the conductive terminal 35 by the reciprocating motion of the brushes 32, for example, four brushes 32 as shown in FIG. 2. By the proper combination of, the required switching signal can be obtained.

3 is a cross-sectional view taken along the line AA ′ of FIG. 2. Referring to FIG. 3, the switching brush 32 is driven by contact with the conductive terminal 35 which rotates in the direction of the arrow.

Therefore, since the brush 32 shakes left and right in contact with the conducting terminal 35 in addition to the reciprocating motion, the switching brush 32 generally wears out as the time of use increases. As a result, the brush 32 and the brush holder 36 should not be fully engaged. 'G' in FIG. 3 represents a constant distance between the brush 32 and the brush holder 36.

Accordingly, the role of the brush holder 36 in this structure only serves as a guide of the brush 32 and the contact sound between the brush and the brush holder due to the rotation of the conductive terminal 35 by a constant gap g. This is accompanied by.

Therefore, the contact between the switching brush 32 and the brush holder 36 in accordance with the rotational speed of the rotor is inevitable, which causes the brush 32 and the holder 36 are accompanied by severe contact noise. As a result, the overall noise of the motor is being increased.

Accordingly, the present invention has been made to solve the above problems, the object is to reduce the wear rate of the brush through the simple structure improvement of the brush holder of the switching element, and to reduce the noise of the contact noise motor To provide.

1 is a cross-sectional view schematically showing a general motor,

2 is an enlarged view of the switching system of FIG. 1;

3 is a cross-sectional view taken along the line AA ′ of FIG. 2;

4 is an enlarged view of a switching system of a motor according to the present invention;

5 is an enlarged view of a brush and a brush holder of FIG. 4;

6 is a perspective view showing in detail the brush holder in FIG.

6A is a side view of FIG. 6.

* Description of the symbols for the main parts of the drawings *

300-switching system 305-switching terminals

315-Conductive Terminal Piece 310-Brush

320-spring

330-brush holder

332a- Holder top 332b-Holder bottom

335a, 335b-U-shaped through groove

The present invention for achieving the above object is a control motor comprising a rectifying system, an armature core, and a switching system surrounding the rotating body of the motor,

The switching system includes: a switching terminal surrounding the rotating body, a plurality of conductive terminal pieces provided at predetermined intervals along an outer circumferential surface of the switching terminal, and the conductive terminal piece according to rotation of the conductive terminal piece or according to its reciprocating motion. At least one switching brush in contact with the spring, a spring attached to the brush to press the brush to minimize contact resistance during rectification, and

And a brush holder surrounding the brush to smoothly guide the reciprocating motion of the switching brush,

The brush holder has a thickness of a central contact surface that is in contact with the brush of the upper and lower plates of the brush holder in order to prevent abrasion and contact noise of the brush when the brush is in contact with the rotating conductive terminal piece. Is characterized in that the inclined surface formed to be inclined to the upper surface of the lower surface and the lower surface of the upper plate so as to become thicker toward the insertion direction of the brush.

Preferably, the brush holder further includes at least one through groove for applying a tension action to adjacent portions of the upper and lower center portions of the brush holder to fluidly fix the brush.

In addition, the tension through grooves have a U-shape when viewed in the inserting direction of the brush, and the U-shaped through grooves are formed in two, one at both left and right ends of the brush.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is an enlarged cross-sectional view showing a switching system having a brush according to the invention, Figure 5 is a view showing in detail the structure of the brush and brush holder of the switching system according to the invention, and Figure 6 The perspective view which shows the structure of the brush holder in detail is shown, respectively.

4 and 5, the switching system 300 of the motor according to the present invention includes a switching terminal 305 surrounding a rotating body and a plurality of conductive parts installed at predetermined intervals along an outer circumferential surface of the switching terminal 305. A terminal piece 315, at least one switching brush 310 in contact with the conductive terminal piece 315 according to the rotation of the conductive terminal piece 315 or its own reciprocating motion, and the switching A spring 320 for pressurizing the brush to minimize contact resistance with the conductive terminal piece 315 during rectification, and the switching to smoothly guide the reciprocating motion of the switching brush 310. It consists of a brush holder 330 surrounding the brush 310.

The switching principle of the switching system having the above-described configuration will be described below with reference to FIG.

As shown in Fig. 4, a plurality of conductive terminal pieces 315 (four in this embodiment) are inserted on the outer circumferential surface of the rotating body at equal intervals or at predetermined intervals, and the conductive terminal pieces 315 are internal or external. It is selectively connected by the wiring wired to it.

In the present embodiment, four conductive terminal pieces 315 are formed, but the conductive terminal pieces 315 may be selectively connected to six or eight pieces.

When the switching brushes 310 are in contact with each other and the switching terminals 305 are rotated in the direction of the arrow in the state where the switching brush 310 is in contact with the conductive terminal piece 315, the switching is performed in the switch cut region. Brushes 310 are shorted to each other. As such, by switching the power supplied to the high frequency transformer using the switching brush 310 and the switching terminal, it is possible to increase the frequency efficiency of the transformer.

The efficiency of the transformer can be appropriately adjusted by adjusting the rotation speed of the switching terminal 305, the number of conductive terminal pieces 315, and the number of switching brushes 310.

Hereinafter, the structure of the brush holder 330 according to the present invention will be described with reference to the perspective view of FIG. 6 and the side view of FIG. 6A.

In this embodiment, the brush holder 330 surrounding the brush in order to prevent abrasion and contact noise of the brush due to the left and right shake of the brush when the switching brush 310 and the rotating conductive terminal piece 315 is in contact with the brush. The upper surface 332a and the lower surface 332b of the contact surface with the brush is formed so as to become thicker toward the insertion direction of the switching brush 310.

That is, as shown in FIGS. 6 and 6a, the bottom of the center of the holder upper plate 332a is cut inclined downward toward the arrow direction in the brush insertion direction, and the top of the center of the holder lower plate 332b is arrowed. The cutting surface is formed to be inclined upward toward the direction.

In addition, the brush holder 330 is at least one through groove for applying a tension action to the adjacent portions of the central portion of the upper plate 332a and the lower plate 332b of the brush holder to fluidly fix the brush. And 335a and 335b, which are formed to have a U-shape as shown in FIG. 6 when viewed in the direction of insertion of the brush.

At this time, the inclination of the upper plate (332a) and the lower plate (332b) of the brush holder, as shown in Figure 6 and 6a, the inclination angle is formed from the cut-out portion (A), the U-shaped through groove 335a , 335b) may be determined in consideration of the size of the brush or the size of the upper plate 332a and the lower plate 332b of the brush holder to give an optimal twist. In this embodiment, in order to give an optimum tensioning action, as shown in Fig. 6, two U-shaped through-grooves are designed to be provided at the left and right ends of the brush one by one.

As described above, in the present invention, the brush holder 330 of the switching system 300 is provided with through grooves 335a and 335b which can impart a torsion function and an inclined cutting surface, thereby preventing the rotation of the conductive terminal piece 315. The left and right shake of the brush can be prevented, and the position of the brush can be fixed fluidly. In addition, the contact noise generated through the contact between the brush and the brush holder can be greatly reduced.

This invention can be implemented in other various forms, without deviating from the mind or main character. Therefore, the above-described embodiments are merely examples in all respects and should not be interpreted limitedly. The scope of the present invention is shown by the Claims, and is not restrict | limited by the specification body. In addition, all the deformation | transformation and a change which belong to the equal range of a claim are within the scope of this invention.

As described above, according to the present invention, a simple structure improvement of the brush holder can reduce the wear rate of the brush and reduce the contact noise. That is, according to the present invention, through the structural improvement of the brush holder having a through groove and an inclined incision surface that can have a tension function, it is possible to prevent the left and right shake of the brush due to the rotation of the conductor piece and also the position of the brush Can be fixed fluidly. In addition, it has an effect that can greatly reduce the contact noise generated through the contact between the brush and the brush holder.

Claims (4)

In a control motor comprising a rectifying system, an armature core, and a switching system surrounding a rotating body of a motor, The switching system, A switching terminal surrounding the rotating body; A plurality of conductive terminal pieces disposed along a circumferential surface of the switching terminal at predetermined intervals; At least one switching brush in contact with the conductive terminal piece according to the rotation of the conductive terminal piece or its reciprocating motion; A spring attached to the brush to press the brush to minimize contact resistance during rectification; And And a brush holder surrounding the brush to smoothly guide the reciprocating motion of the switching brush, The brush holder has a thickness of the contact surface with the brush at the center of the upper plate and the lower plate of the brush holder in order to prevent abrasion and contact noise of the brush caused by left and right shake of the brush when the brush is in contact with the rotating conductive terminal piece. Noise prevention motor, characterized in that formed to be inclined the incision surface, the bottom surface of the upper plate and the upper surface of the lower plate so as to become thicker toward the insertion direction of the brush. The method of claim 1, wherein the brush holder, And at least one through groove for tensioning the upper and lower portions of the center of the brush holder so as to fluidly fix the brush. The method of claim 2, wherein the tension through groove, Noise prevention motor, characterized in that the U-shaped through groove when viewed in the insertion direction of the brush. The method of claim 3, wherein the U-shaped through groove, Noise prevention motor, characterized in that formed in two one at both ends of the left and right sides of the brush