Slip ring for motor

Abstract

A slip ring for a motor, relating to the technical field of electric slip rings, and comprising a mounting mechanism. The mounting mechanism comprises an inner steel sleeve and an inner insulating sleeve. A slip ring assembly is arranged outside the inner insulating sleeve. The slip ring assembly comprises: three slip ring sleeves, a connection slot being formed in the outer wall on one side of each slip ring sleeve; three lead wires separately fixed to inner walls of the three slip ring sleeves; and two inter-ring insulating sleeves separately sleeved on the outer wall of the inner insulating sleeve. A small end cover is arranged outside the slip ring sleeves, and six mounting openings are formed on an annular outer wall of the small end cover. The present invention has the advantages of small size, light weight, compact structure, and large current-carrying capacity, and during long-term operation, and phenomena such as low inter-ring insulation and low insulation to ground are less likely to occur, thereby improving practicability.

Description

A slip ring for an electric motor Technical Field

[0001] This invention relates to the field of slip ring technology, and more particularly to a slip ring for motors. Background Technology

[0002] Electrical slip rings are the most widely used type of slip ring in all slip ring series. They are also called brushes, carbon brushes, collector rings, current collector rings, swivel rings, and rotary electrical joints. They are specifically used to transmit power and signal power during unrestricted continuous rotation. The stator and rotor sections each have wires leading out to connect the power supply and terminal electrical components of the fixed and rotating structures, and rotate accordingly. Based on their overall structure, they are divided into solid round slip rings (a hole is drilled in the rotating body to install the slip ring), hollow round slip rings (the slip ring is installed on the rotating shaft), as well as split slip rings, flat disc slip rings, mercury slip rings, special slip rings, etc.

[0003] In actual use, slip rings can be damaged due to prolonged operation, and may experience problems such as low inter-ring insulation and low insulation to ground. In addition, existing slip rings are large in size and heavy in weight, making them impractical. Summary of the Invention

[0004] This invention provides a slip ring for motors, which solves the problems of slip rings in the prior art being damaged due to long-term operation, and easily exhibiting low inter-ring insulation and low insulation to ground. At the same time, existing slip rings are large in size, heavy in weight, and have low practicality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A slip ring for a motor includes a mounting mechanism. The mounting mechanism includes an inner steel sleeve and an inner insulating sleeve. A slip ring assembly is provided outside the inner insulating sleeve. The slip ring assembly includes three slip ring sleeves, each with a connecting groove on one side of its outer wall; three lead wires respectively fixed to the inner walls of the three slip ring sleeves; and two inter-ring insulating sleeves respectively fitted onto the outer walls of the inner insulating sleeve. A small end cap is provided outside the slip ring sleeve, and the annular outer wall of the small end cap has six mounting holes. An insulating assembly is provided inside the small end cap. The insulating assembly includes four insulating plates, each with a collector ring groove on one side of its outer wall; and three collector rings respectively embedded in three of the collector ring grooves. Six connecting assemblies are provided between the four insulating plates. Each connecting assembly includes a brush box with fixing holes on both sides of its outer wall; a carbon brush embedded in the brush box; and compression springs with their two ends respectively embedded in two fixing holes.

[0007] Preferably, the outer wall of the inner insulating sleeve has three mounting grooves, and the inner insulating sleeve is fitted onto the outer wall of the inner steel sleeve.

[0008] Preferably, the three slip ring sleeves are respectively fitted onto the outer wall of the inner insulating sleeve, and the three leads are respectively embedded in the three mounting slots. One end of the two inter-ring insulating sleeves is respectively inserted into the connecting slots on two of the slip ring sleeves, and the two inter-ring insulating sleeves are both located between the three slip ring sleeves.

[0009] Preferably, one side of the small end cap abuts against the outer wall of the inner steel sleeve, and the small end cap is bolted to the outer wall of the end cap.

[0010] Preferably, the four insulating plates are respectively sleeved on the outer walls of the three slip ring sleeves, and the four insulating plates are respectively sleeved on the inner wall of the small end cap. Six limiting grooves are opened on the outer wall of the four insulating plates near the collector ring groove, and several locking grooves are opened on the outer wall of the four insulating plates away from the collector ring groove.

[0011] Preferably, one side of the brush box is engaged in the limiting groove, and the other side of the brush box is engaged in two of the slots, and one end of the compression spring abuts against the outer wall of the carbon brush.

[0012] Preferably, the small end cap has three ring-shaped terminals connected to its annular outer wall by bolts, and the three terminals are respectively connected to the collector ring by brush wires.

[0013] The beneficial effects of this invention are as follows:

[0014] After being bent by a mold, the three lead wires are welded to the three slip rings respectively. The steel sleeve and the inner insulating sleeve are aligned and assembled. The slip ring with bow wire is connected to the outer side of the inner insulating sleeve and then fitted. Finally, it is basically completed after impregnation and potting. Each phase terminal is connected to the slip ring through the soft copper wire of the brush. The corresponding compression spring is installed in each brush box to apply sufficient pressure to the conduction between the brush and the slip ring. The brush box and the insulating plate are installed with insulating screws to ensure overall performance and high reliability. The internal parts of the small end cover are fixed to the end cover with six countersunk screws to ensure integrity. It has been applied to a 91kW brushless permanent magnet DC motor (DC input of the frequency converter is 450DC, 202A). The product has been tested and verified to be stable and reliable (short time 20min, long time can be used with derating according to user requirements).

[0015] In summary, this invention has the advantages of small size, light weight, compact structure, and high conductivity. During long-term operation, it is less prone to problems such as low inter-ring insulation and low insulation to ground, thus improving its practicality. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the overall main structure of a slip ring for a motor proposed in this invention.

[0017] Figure 2 is a schematic diagram of the main structure of the mounting mechanism for a slip ring for a motor proposed in this invention.

[0018] Figure 3 is a schematic diagram of the main structure of a slip ring assembly for a motor proposed in this invention.

[0019] Figure 4 is a schematic diagram of the main structure of the inter-ring insulating sleeve of a slip ring for a motor proposed in this invention.

[0020] Figure 5 is a side view of the small end cap structure of a slip ring for motors proposed in this invention.

[0021] Figure 6 is a schematic diagram of the main structure of the insulation component of a slip ring for a motor proposed in this invention.

[0022] Figure 7 is a schematic diagram of the main structure of the connecting component of a slip ring for a motor proposed in this invention.

[0023] In the diagram: 1. Mounting mechanism; 101. Inner steel sleeve; 102. Inner insulating sleeve; 2. Slip ring assembly; 201. Slip ring sleeve; 202. Lead wire; 203. Inter-ring insulating sleeve; 3. Small end cap; 4. Insulation assembly; 401. Insulation plate; 402. Slip ring; 5. Connecting assembly; 501. Brush box; 502. Carbon brush; 503. Compression spring; 6. Terminal block. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Example 1, referring to Figures 1-7, a slip ring for a motor includes a mounting mechanism 1. The mounting mechanism 1 includes an inner steel sleeve 101 and an inner insulating sleeve 102. The outer wall of the inner insulating sleeve 102 has three mounting grooves, and the inner insulating sleeve 102 is fitted onto the outer wall of the inner steel sleeve 101. A slip ring assembly 2 is provided outside the inner insulating sleeve 102. The slip ring assembly 2 includes three slip ring sleeves 201, each with a connecting groove on one side of its outer wall, three lead wires 202 respectively fixed to the inner walls of the three slip ring sleeves 201, and two inter-ring insulation rings respectively fitted onto the outer walls of the inner insulating sleeves 102. The three slip ring sleeves 201 are respectively fitted onto the outer wall of the inner insulating sleeve 102, and the three leads 202 are respectively embedded in the three mounting slots. One end of each of the two inter-ring insulating sleeves 203 is inserted into the connecting slot on two of the slip ring sleeves 201, and the two inter-ring insulating sleeves 203 are both located between the three slip ring sleeves 201. The slip ring sleeve 201 is provided with a small end cap 3 on its outside, and the annular outer wall of the small end cap 3 has six mounting holes. One side of the small end cap 3 abuts against one side of the outer wall of the inner steel sleeve 101, and the small end cap 3 is connected to one side of the outer wall of the end cap by bolts. The small end cap 3 is provided with an insulating component 4. The insulating component 4 includes four insulating plates 401, each with a collector ring groove on one side of its outer wall, and three collector rings 402 respectively embedded in three of the collector ring grooves. The four insulating plates 401 are respectively sleeved on the outer walls of three slip ring sleeves 201, and the four insulating plates 401 are respectively sleeved on the inner wall of the small end cap 3. The outer wall of the four insulating plates 401 near the collector ring groove has six limiting grooves, and the outer wall of the four insulating plates 401 away from the collector ring groove has several locking grooves. Each part is provided with six connecting components 5. Each connecting component 5 includes a brush box 501 with fixing holes on both outer walls, a carbon brush 502 embedded in the brush box 501, and a compression spring 503 with its two ends respectively embedded in two fixing holes. One side of the brush box 501 is engaged in a limiting groove, and the other side of the brush box 501 is engaged in two of the slots. One end of the compression spring 503 abuts against the outer wall of the carbon brush 502. Three terminals 6 distributed in a ring are connected to the annular outer wall of the small end cap 3 by bolts, and the three terminals 6 are respectively connected to the collector ring 402 through the soft copper wire of the brush.

[0026] After being bent by a mold, the three lead wires 202 are welded to the three slip ring sleeves 201 respectively. The inner steel sleeve 101 and the inner insulating sleeve 102 are aligned and assembled. The slip ring sleeve 201 with lead wires 202 is connected to the inter-ring insulating sleeve 203 and assembled to the outside of the inner insulating sleeve 102. Finally, it is basically completed after impregnation and potting. Each phase terminal 6 is connected to the collector ring through the soft copper wire of the brush. The corresponding compression spring 503 is installed in each brush box 501 to apply sufficient pressure to the conduction between the brush 502 and the slip ring sleeve 201. The brush box 501 and the insulating plate 401 are installed with insulating screws to ensure overall performance and high reliability. The internal parts of the small end cover 3 are fixed to the end cover with 6 countersunk screws to ensure integrity. In actual testing, the slip ring structure was tested for phase-to-phase and phase-to-ground insulation at 160℃. No breakdown or flashover occurred at 50Hz 5000ACV.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A slip ring for an electric motor, comprising a mounting mechanism (1), characterized in that, The installation mechanism (1) includes an inner steel sleeve (101) and an inner insulating sleeve (102); The inner insulating sleeve (102) is provided with a slip ring assembly (2) on the outside. The slip ring assembly (2) includes three slip ring sleeves (201) with connecting grooves on one side of the outer wall, three lead wires (202) respectively fixed on the inner wall of the three slip ring sleeves (201), and two inter-ring insulating sleeves (203) respectively sleeved on the outer wall of the inner insulating sleeve (102). The slip ring sleeve (201) is provided with a small end cap (3) on the outside, and the small end cap (3) has six mounting holes on its annular outer wall; The small end cap (3) is provided with an insulating component (4), which includes four insulating plates (401) with a current collecting ring groove on one side of the outer wall and three current collecting rings (402) respectively embedded in three of the current collecting ring grooves; Six connecting components (5) are provided between the four insulating plates (401). Each connecting component (5) includes a brush box (501) with fixing holes on both outer walls, a carbon brush (502) embedded in the brush box (501), and a compression spring (503) with its two ends embedded in two fixing holes respectively.

2. The slip ring for a motor according to claim 1, characterized in that, The inner insulating sleeve (102) has three mounting grooves on its outer wall, and the inner insulating sleeve (102) is fitted onto the outer wall of the inner steel sleeve (101).

3. A slip ring for a motor according to claim 2, characterized in that, The three slip ring sleeves (201) are respectively sleeved on the outer wall of the inner insulating sleeve (102), and the three leads (202) are respectively embedded in the three mounting slots. One end of the two inter-ring insulating sleeves (203) is respectively inserted into the connecting slots on two of the slip ring sleeves (201), and the two inter-ring insulating sleeves (203) are both located between the three slip ring sleeves (201).

4. A slip ring for a motor according to claim 1, characterized in that, The small end cap (3) abuts against the outer wall of the inner steel sleeve (101) on one side, and the small end cap (3) is connected to the outer wall of the end cap by bolts.

5. A slip ring for a motor according to claim 1, characterized in that, The four insulating plates (401) are respectively sleeved on the outer wall of the three slip ring sleeves (201), and the four insulating plates (401) are respectively sleeved on the inner wall of the small end cap (3). Six limiting grooves are opened on the outer wall of the four insulating plates (401) near the collector ring groove, and several locking grooves are opened on the outer wall of the four insulating plates (401) away from the collector ring groove.

6. A slip ring for a motor according to claim 5, characterized in that, The brush box (501) is engaged in the limiting groove on one side, and the brush box (501) is engaged in two of the slots on the other side. One end of the compression spring (503) abuts against the outer wall of the carbon brush (502).

7. A slip ring for a motor according to claim 1, characterized in that, The small end cap (3) has three ring-shaped terminals (6) connected to its annular outer wall by bolts, and the three terminals (6) are respectively connected to the collector ring (402) by brush soft copper wire.

Images