Carbon brush assembly of direct current brush motor

Abstract

The utility model discloses a carbon brush assembly of a direct current brush motor, which comprises a carbon brush disc, a carbon brush holder, a carbon brush, a mounting column, a first riveting column, an inductor support, an inductor and a capacitor, the carbon brush holder is fixed on the carbon brush disc, the carbon brush is matched with the carbon brush holder, the mounting column and the first riveting column are respectively fixed on the carbon brush disc, and the inductor support is fixed with the carbon brush disc. The inductor support is located on the inner sides of the installation column and the first riveting column, the two ends of the inductor are matched with the inductor support respectively, the capacitor is installed on the carbon brush disc, and the inductor and the capacitor are connected with the carbon brush respectively. The motor is effectively prevented from being interfered by electromagnetic interference, and the operation stability of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brushed motors, and particularly relates to a carbon brush assembly of a DC brushed motor. Background Art

[0002] With the increasing requirements for the use safety and performance reliability of motors in modern medical, agricultural and other fields, in order to prevent high-frequency electromagnetic generated during motor operation from entering the power supply and interfering with the normal operation of other devices, motors in the medical industry generally add capacitors and inductors to the motor to block electromagnetic interference to other devices. The traditional method is to add additional capacitors and inductors outside the motor, but such a design has the following defects:

[0003] (1) It expands the space occupied by the motor and limits some applications with limited space.

[0004] (2) The additional materials lead to an increase in cost, and the complex wiring causes the risk of other interferences.

[0005] (3) The external placement of capacitors and inductors is prone to moisture absorption or dust ingress, reducing the reliability of use, etc.

[0006] In addition, in the current carbon brush assembly of a brushed motor, neither the carbon brush nor the carbon brush holder is constrained. During the use of the motor, it is easy to cause the carbon brush and the carbon brush holder to become loose. Therefore, there is still a risk of carbon brush detachment in the existing carbon brush assembly. Summary of the Utility Model

[0007] In view of the above problems, the utility model provides a carbon brush assembly of a DC brushed motor, which effectively avoids electromagnetic interference to the motor and improves the stability of motor operation.

[0008] The technical solutions to solve the above technical problems are as follows:

[0009] The carbon brush assembly of a DC brushed motor includes a carbon brush disk, a carbon brush holder, a carbon brush, a mounting post, and a first riveting post. The carbon brush holder is fixed on the carbon brush disk, the carbon brush cooperates with the carbon brush holder, the mounting post and the first riveting post are respectively fixed on the carbon brush disk, and further includes an inductor bracket, an inductor, and a capacitor. The inductor bracket is fixed to the carbon brush disk, the inductor bracket is located inside the mounting post and the first riveting post, both ends of the inductor respectively cooperate with the inductor bracket, the capacitor is installed on the carbon brush disk, and the inductor and the capacitor are respectively connected to the carbon brush.

[0010] Further, it also includes a first support member, a second support member, and an insulating plate. The first support member is located on one side of the carbon brush holder, and a first clamping member is provided on the first support member. The second support member is located on the other side of the carbon brush holder, and a second clamping member is provided on the second support member. The insulating plate is provided with a first clamping hole and a second clamping hole. The insulating plate is pressed on the carbon brush holder. The first clamping member is in interference fit with the first clamping hole, and the second clamping member is in interference fit with the second clamping hole.

[0011] Further, it also includes a torsion spring and a mounting seat. The torsion spring is sleeved on the first support member. One end of the torsion spring is engaged with the mounting seat, and an opening is provided on the carbon brush. The other end of the torsion spring is engaged with the opening on the carbon brush.

[0012] Further, the first riveting post includes a column body, a convex portion, and a tightening ring. A shaft hole is provided on the column body. The convex portion and the tightening ring are located in the shaft hole on the column body and are fixed to the column body.

[0013] In the present utility model, an inductor and a capacitor are arranged on the carbon brush disc. The inductor and the capacitor absorb high-frequency energy, prevent the output of high-frequency energy, eliminate electromagnetic interference signals, avoid electromagnetic interference to other devices caused by high-frequency interference generated by the commutator spark during the operation of the motor, and reduce the occupation of the motor installation space caused by external capacitors and inductors. It is applicable to application scenarios with insufficient space structure and has extremely high market value. In addition, the capacitor can also adjust the waveforms of the current and voltage, making the start, operation, and stop of the motor more stable and prolonging the service life of the motor. Description of the Drawings

[0014] Figure 1 It is a three-dimensional view of the carbon brush assembly of the DC brushed motor.

[0015] Figure 2 It is a three-dimensional view of the carbon brush assembly of the DC brushed motor in another direction.

[0016] Marks in the drawings:

[0017] Carbon brush disc 1, connecting member 1a, connecting sleeve 1b, plane 1c, groove 1d, carbon brush holder 2, carbon brush 3, opening 3a, mounting post 4, first riveting post 5, column body 5a, convex portion 5b, tightening ring 5c, inductor bracket 6, inductor 7, capacitor 8, first support member 9, first clamping member 9a, second support member 10, second clamping member 10a, insulating plate 11, torsion spring 12, mounting seat 13, second riveting post 14, wire 15, welding bracket 16. Detailed Description of the Embodiment

[0018] The present utility model will be further described in detail below in conjunction with the drawings and the detailed description of the embodiment.

[0019] As Figures 1 to 2As shown in the figure, the carbon brush assembly of the DC brushed motor of the present utility model includes a carbon brush disc 1, a carbon brush holder 2, a carbon brush 3, a mounting post 4, a first riveting post 5, an inductor bracket 6, an inductor 7, and a capacitor 8. The carbon brush disc 1 is provided with a first hole for the rotor shaft to pass through. The carbon brush disc 1 is provided with connecting components 1a. There are multiple connecting components 1a and they are arranged around the first hole. These connecting components 1a are arranged at intervals. The ends of these connecting components 1a are connected to a connecting sleeve 1b. A part of the connecting sleeve 1b is used to cooperate with the bearing hole opened on the motor end cover (the motor end cover is not shown in the figure). The peripheral surface of the connecting sleeve 1b is composed of a flat surface 1c and an arc surface.

[0020] The carbon brush holder 2 is fixed on the carbon brush disc 1. The carbon brush 3 cooperates with the carbon brush holder 2. The cooperation between the carbon brush 3 and the carbon brush holder 2 is a conventional method and will not be elaborated here. The carbon brush 3 is connected to a wire 15, and the wire 15 is connected to a welding frame 16. The mounting post 4 and the first riveting post 5 are respectively fixed on the carbon brush disc 1. A screw passes through the mounting post 4 to connect with the motor end cover, so that the carbon brush disc 1 and the motor end cover are fastened together as a whole.

[0021] The first riveting post 5 includes a column body 5a, a protruding part 5b, and a tightening ring 5c. One end of the column body 5a is fixed to the carbon brush disc 1. Preferably, the column body 5a and the carbon brush disc 1 are integrally formed. The column body 5a is provided with a shaft hole. The protruding part 5b and the tightening ring 5c are located in the shaft hole on the column body 5a and are fixed to the column body 5a. A first rivet passes through the shaft hole on the column body 5a and has an interference fit with the mounting hole provided on the motor end cover. The first rivet also has an interference fit with the protruding part 5b and the tightening ring 5c, so that the first riveting post 5 and the motor end cover are fastened together as a whole.

[0022] The inductor bracket 6 is fixed to the carbon brush disc 1. The inductor bracket 6 is located inside the mounting post 4 and the first riveting post 5. Both ends of the inductor 7 are respectively cooperated with the inductor bracket 6. The capacitor 8 is installed on the carbon brush disc 1. The inductor 7 and the capacitor 8 are respectively connected to the carbon brush 3. The capacitor 8 is located between the mounting post 4 and the first riveting post 5. A groove 1d is provided on the carbon brush disc 1, and the capacitor 8 cooperates with the groove 1d.

[0023] The inductor 7 utilizes the magnetic field generated by the current in the coil. When the current in the wire changes, the magnetic field will also change. According to Faraday's law of electromagnetic induction, the change of the magnetic field will generate an induced electromotive force around the wire and hinder the change of the current. This characteristic of hindering the change of the current is the working principle of the inductor. Using this principle, on the carbon brush disc 1, the inductor 7 is reasonably added using the space to suppress electromagnetic interference, reduce the instantaneous impact of the current, reduce power loss, and improve the efficiency and stability of the motor.

[0024] Capacitor 8 is a component formed by insulating medium separation between two conductors. When the two conductors carry charges, an electric field is formed between them. According to Coulomb's law, the electric field strength of capacitor 8 is directly proportional to the charge capacity and inversely proportional to the conductor spacing and the dielectric constant of the medium. This characteristic of storing charges is the operating principle of the capacitor. Using this principle, adding capacitor 8 on the carbon brush disc 1 can effectively suppress electric sparks, extend the lifespan of the carbon brush 3, and smooth the current of the motor.

[0025] This utility model uses inductor 7 to reduce the high-frequency interference generated by the brush / commutator spark, and uses capacitor 8 to absorb high-frequency energy to prevent high-frequency noise pollution to other devices. The brushed DC motor of this utility model integrates two inductors 7 and two capacitors 8 on the carbon brush disc 1 through a compact design. Compared with external inductors and capacitors, the size and occupied space of the motor are greatly reduced, and its advantages can be exerted in applications with high space limitation requirements.

[0026] This utility model further includes a first support member 9, a second support member 10, and an insulating plate 11. The first support member 9 is located on one side of the carbon brush holder 2, and a first clamping member 9a is provided on the first support member 9. The second support member 10 is located on the other side of the carbon brush holder 2, and a second clamping member 10a is provided on the second support member 10. The insulating plate 11 is provided with a first clamping hole and a second clamping hole. The insulating plate 11 is pressed on the carbon brush holder 2. The first clamping member 9a is in interference fit with the first clamping hole, and the second clamping member 10a is in interference fit with the second clamping hole. The insulating plate 11 is fixed by the first clamping member 9a and the second clamping member 10a, and the insulating plate 11 is pressed on the carbon brush holder 2, thereby restricting the displacement of the carbon brush holder 2. The peripheral surface of the insulating plate 11 has a flat surface, and the flat surface on the insulating plate 11 cooperates with the flat surface 1c on the connecting sleeve 1b, thereby increasing the strength of the connecting sleeve 1b.

[0027] This utility model further includes a torsion spring 12 and a mounting seat 13. The torsion spring 12 is sleeved on the first support member 9. One end of the torsion spring 12 cooperates with the mounting seat 13. An opening 3a is provided on the carbon brush 3, and the other end of the torsion spring 12 cooperates with the opening 3a on the carbon brush 3. Through the cooperation of the torsion spring 12 and the carbon brush 3, the carbon brush 3 is kept in cooperation with the carbon brush holder 2 by the elastic force of the torsion spring, avoiding the carbon brush 3 from slipping out of the carbon brush holder 2.

[0028] This utility model further includes a second riveting post 14. One end of the second riveting post 14 is fixed to the carbon brush disc 1. A through hole is provided on the second riveting post 14. The second riveting post 14 is the same as the first riveting post 5, and a rivet also passes through the carbon brush disc 1 and the second riveting post 14 and is in interference fit with the motor end cover, thereby fixing the carbon brush disc 1 and the motor end cover into one body.

[0029] Finally, it should be noted that the above-described embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, rather than limiting it, let alone limiting the protection scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the claims.

Claims

1. A carbon brush assembly for a brushless DC motor, comprising a carbon brush disc (1), a carbon brush holder (2), a carbon brush (3), a mounting post (4), and a first riveted post (5), wherein the carbon brush holder (2) is fixed on the carbon brush disc (1), the carbon brush (3) cooperates with the carbon brush holder (2), the mounting post (4) and the first riveted post (5) are respectively fixed on the carbon brush disc (1), and characterized in that: It also includes an inductor bracket (6), an inductor (7), and a capacitor (8). The inductor bracket (6) is fixed to the carbon brush disc (1). The inductor bracket (6) is located on the inner side of the mounting column (4) and the first riveted column (5). The two ends of the inductor (7) are respectively matched with the inductor bracket (6). The capacitor (8) is mounted on the carbon brush disc (1). The inductor (7) and the capacitor (8) are respectively connected to the carbon brush (3).

2. The carbon brush assembly of a DC brushed motor according to claim 1, characterized in that: The invention also comprises a first supporting component (9), a second supporting component (10), and an insulating plate (11); the first supporting component (9) is located on one side of the carbon brush holder (2); a first clamping component (9a) is provided on the first supporting component (9); the second supporting component (10) is located on the other side of the carbon brush holder (2); a second clamping component (10a) is provided on the second supporting component (10); a first clamping hole and a second clamping hole are provided on the insulating plate (11); the insulating plate (11) is pressed onto the carbon brush holder (2); the first clamping component (9a) is interference-fitted with the first clamping hole; and the second clamping component (10a) is interference-fitted with the second clamping hole.

3. The carbon brush assembly of a DC brushed motor according to claim 2, characterized in that: It also includes a torsion spring (12) and a mounting seat (13). The torsion spring (12) is sleeved on the first supporting component (9). One end of the torsion spring (12) cooperates with the mounting seat (13). The carbon brush (3) is provided with an opening (3a). The other end of the torsion spring (12) cooperates with the opening (3a) on the carbon brush (3).

4. The carbon brush assembly of a DC brushed motor according to claim 1, characterized in that: The first riveted column (5) comprises a column (5a), a protruding portion (5b), and a tightening ring (5c); an axial hole is provided on the column (5a); the protruding portion (5b) and the tightening ring (5c) are located in the axial hole on the column (5a) and are fixed to the column (5a).

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