Large synchronous motor slip ring cooling structure
By increasing the number of brushes and optimizing their distribution and angle, the problem of high slip ring temperature of large synchronous motors is solved, and the effective reduction of slip ring temperature and enhanced heat dissipation ability is achieved.
Patent Information
- Application Number
- CN202421651185.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The problem of high slip ring temperature of large synchronous motors leads to a decrease in motor performance and an increased risk of production accidents. The main reason is that the contact area between the brush and the slip ring is too small, resulting in an increase in current density and local overheating.
By increasing the number of brushes and accurately calculating and optimizing the brush distribution and angle on the brush holder board, the current is evenly distributed on the slip ring, reducing the occurrence of local overheating.
Effectively reduce the temperature of the slip ring, enhance the heat dissipation ability of the slip ring, ensure the normal temperature rise of the slip ring when the motor housing is running, and avoid the problem of the increase in the slip ring temperature rise.
Smart Images
Figure CN223007441U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor slip ring cooling, in particular to a large synchronous motor slip ring cooling structure. Background Technique
[0002] In the steel manufacturing industry, large synchronous motors, as key power equipment, their stability and reliability are crucial for the continuous operation of the production line. However, during actual operation, the problem of high temperature of the slip rings of synchronous motors operating online in steel mills often occurs, which not only affects the performance of the motors but also may cause serious production accidents;
[0003] Through in-depth technical analysis and experimental verification, we found that the main reason for the high temperature of the slip rings is the too small contact area between the carbon brushes and the slip rings. During the operation of the synchronous motor, current flows into the slip rings through the carbon brushes, forming a closed electromagnetic circuit. When the contact area between the carbon brushes and the slip rings is insufficient, the current density will increase significantly, resulting in an increase in local resistance and thus generating a large amount of heat. If these heats cannot be dissipated in time, they will accumulate at the slip rings, causing the temperature of the slip rings to rise rapidly. Therefore, we proposed a large synchronous motor slip ring cooling structure to solve the above problems. Content of the Utility Model
[0004] (I) Technical Problems to be Solved
[0005] In view of the deficiencies of the prior art, the utility model provides a large synchronous motor slip ring cooling structure, which solves the problems raised in the above background technique.
[0006] (II) Technical Solutions
[0007] The utility model specifically adopts the following technical solutions to achieve the above purposes:
[0008] A large synchronous motor slip ring cooling structure includes a motor housing, a rotor is provided on the motor housing, four mounting posts are provided on the bottom inner wall of the motor housing, a plurality of brush holder plates are movably contacted on two mounting posts on the same side, a plurality of mounting holes are opened on the brush holder plates, carbon brushes are mounted on the mounting holes, two connecting parts are fixedly connected to one side of the brush holder plates, connecting holes are opened on the connecting parts, and the connecting parts are connected to the corresponding mounting posts through the connecting holes.
[0009] Further, one side of the brush holder plate is set as a protruding part, and two fixing holes are opened on the protruding part.
[0010] Further, a top cover is threadedly connected to the top of the motor housing.
[0011] Further, the distances between two adjacent mounting holes among the plurality of mounting holes are equal.
[0012] (III) Beneficial effects
[0013] Compared with the prior art, the utility model provides a large synchronous motor slip ring cooling structure, which has the following beneficial effects:
[0014] In the utility model, by increasing the number of carbon brushes determined by the mounting holes on the brush holder plate, under the same current load, the current density borne by each carbon brush is reduced. The reduction of the current density means that the heat generated at the contact point between the carbon brush and the slip ring is reduced, thereby effectively reducing the temperature of the slip ring. The carbon brush is connected to the mounting post through the connecting part and fixed on the brush holder plate. The distribution and angle of the carbon brushes are precisely calculated and optimized to ensure uniform current distribution on the slip ring and avoid local overheating. As the number of carbon brushes increases, the number of contact points between the slip ring surface and the carbon brushes also increases accordingly. During the rotation process, these contact points form tiny air gaps, which helps air flow and enhances the heat dissipation ability of the slip ring, making the temperature rise of the slip ring normal during the operation of the motor housing, and there is no phenomenon of increased temperature rise of the slip ring in the motor housing. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a three-dimensional structural schematic diagram of the utility model;
[0016] Figure 2 is a partial three-dimensional structural schematic diagram of the utility model;
[0017] Figure 3 is a three-dimensional structural schematic diagram of the connection between the brush holder plate and the carbon brush of the utility model;
[0018] Figure 4 is the utility model Figure 3 three-dimensional structural schematic diagram with the carbon brush removed in it.
[0019] In the figure: 1, motor housing; 2, rotor; 3, mounting post; 4, brush holder plate; 5, mounting hole; 6, carbon brush; 7, connecting part; 8, connecting hole; 9, protruding part; 10, fixing hole; 11, top cover. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model. Embodiment
[0021] As Figures 1-4As shown in the figure, a large synchronous motor slip ring cooling structure proposed in an embodiment of the present utility model includes a motor housing 1, a rotor 2 is provided on the motor housing 1, four mounting posts 3 are provided on the bottom inner wall of the motor housing 1, and a plurality of brush holder plates 4 are movably contacted on two mounting posts 3 on the same side. A plurality of mounting holes 5 are provided on the brush holder plate 4, and carbon brushes 6 are mounted on the mounting holes 5. Two connecting parts 7 are fixedly connected to one side of the brush holder plate 4, and connecting holes 8 are provided on the connecting parts 7. The connecting parts 7 are connected to the corresponding mounting posts 3 through the connecting holes 8. By increasing the number of carbon brushes 6, which is determined by the mounting holes 5 on the brush holder plate 4, under the same current load, the current density borne by each carbon brush 6 is reduced. The reduction of the current density means that the heat generated at the contact point between the carbon brush 6 and the slip ring is reduced, thereby effectively reducing the slip ring temperature. The carbon brush 6 is connected to the mounting post 3 through the connecting part 7 and fixed on the brush holder plate 4. The distribution and angle of the carbon brushes 6 are precisely calculated and optimized to ensure uniform current distribution on the slip ring and avoid local overheating. As the number of carbon brushes 6 increases, the number of contact points between the slip ring surface and the carbon brushes 6 also increases accordingly. These contact points form tiny air gaps during rotation, which helps air flow and enhances the heat dissipation ability of the slip ring, enabling the slip ring temperature rise to be normal during the operation of the motor housing 1, and there is no phenomenon of increased slip ring temperature rise in the motor housing 1.
[0022] In some embodiments, one side of the brush holder plate 4 is provided as a protruding part 9, and two fixing holes 10 are provided on the protruding part 9. The setting of the fixing holes 10 plays a stabilizing role.
[0023] In some embodiments, a top cover 11 is threadedly connected to the top of the motor housing 1. The setting of the top cover 11 plays a connecting role.
[0024] In some embodiments, the distance between two adjacent mounting holes 5 among the plurality of mounting holes 5 is equal.
[0025] Working principle or structural principle: During use, by increasing the number of carbon brushes 6, which is determined by the mounting holes 5 on the brush holder plate 4, under the same current load, the current density borne by each carbon brush 6 is reduced. The reduction of the current density means that the heat generated at the contact point between the carbon brush 6 and the slip ring is reduced, thereby effectively reducing the slip ring temperature. The carbon brush 6 is connected to the mounting post 3 through the connecting part 7 and fixed on the brush holder plate 4. The distribution and angle of the carbon brushes 6 are precisely calculated and optimized to ensure uniform current distribution on the slip ring and avoid local overheating. As the number of carbon brushes 6 increases, the number of contact points between the slip ring surface and the carbon brushes 6 also increases accordingly. These contact points form tiny air gaps during rotation, which helps air flow and enhances the heat dissipation ability of the slip ring, enabling the slip ring temperature rise to be normal during the operation of the motor housing 1, and there is no phenomenon of increased slip ring temperature rise in the motor housing 1.
[0026] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A large synchronous motor slip ring cooling structure, comprising a motor housing (1), characterized in that: The motor housing (1) is provided with a rotor (2), and four mounting columns (3) are provided on the inner wall of the bottom of the motor housing (1). Two mounting columns (3) on the same side are movably contacted with a plurality of brush holder plates (4), and a plurality of mounting holes (5) are provided on the brush holder plates (4). Brushes (6) are installed on the mounting holes (5). Two connecting parts (7) are fixedly connected to one side of the brush holder plates (4), and connecting holes (8) are provided on the connecting parts (7). The connecting parts (7) are connected to corresponding mounting columns (3) through the connecting holes (8).
2. A large synchronous motor slip ring cooling structure according to claim 1, characterized in that: One side of the brush holder plate (4) is provided with a protrusion (9), and two fixing holes (10) are provided on the protrusion (9).
3. A large synchronous motor slip ring cooling structure according to claim 1, characterized in that: A top cover (11) is threadedly connected to the top of the motor housing (1).
4. A large synchronous motor slip ring cooling structure according to claim 1, characterized in that: The spacing between two adjacent mounting holes (5) among the plurality of mounting holes (5) is equal.