A kind of outer slide ring winding motor rotor passes through shaft conductive row lead-out structure

Abstract

This invention relates to a slip ring assembly structure for high-current rotors of wound-rotor motors, belonging to the technical field of electrical transmission component structures. It describes an external slip ring-rotor through-shaft conductive busbar lead-out structure for wound-rotor motors, comprising a stationary unit fixed to a motor base, including fixing rings on both sides for mounting brush holders, which contact conductive rings on a rotating unit via brushes; a sealing cover is provided on the outside of the stationary unit, one end of which is fixed to the motor base; and a rotating unit fixed to the motor shaft, mounting conductive rings and conductive busbars, with a ventilation structure on the conductive rings. The structural design of the brush holder and slip ring components complement each other. The brush holder solves the problem of insufficient installation space for brushes, while the slip ring structure addresses the issues of high rotor current, poor ventilation of the conductive rings, and uneven heat dissipation. This improves the reliability of high-current wound-rotor motors and broadens the application areas of wound-rotor motors.

Description

Technical Field

[0001] This invention relates to a slip ring assembly structure for high current winding of a wound-rotor motor, belonging to the technical field of electrical transmission component structure. Background Technology

[0002] Some large-scale wound-rotor motors have long been plagued by slip ring issues, particularly the risk of slip ring failure and blowouts. This is because the slip ring chamber structure is complex, making it difficult to implement measures to prevent blowouts. Currently, with the increasing capacity of wound-rotor motors, some overseas customers are intentionally reducing rotor voltage, leading to a gradual increase in rotor current and various slip ring problems. These range from minor issues like accelerated wear of the slip rings and brushes, requiring frequent replacements, high slip ring temperatures, and excessive vibration, to more serious problems such as triggering overcurrent protection shutdowns or even causing slip ring failures and motor burnouts, resulting in increasingly higher operating, maintenance, and repair costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a slip ring assembly structure for high current winding motor rotors, which rationally distributes brushes, reduces temperature rise, protects slip rings, ensures reliable motor operation, thereby reducing maintenance costs and improving motor reliability.

[0004] According to the technical solution provided by the present invention, a rotor through-shaft conductive busbar lead-out structure for an externally sliding wound coil motor includes:

[0005] A stationary unit, fixed to a motor base, includes a brush rod, a brush, a brush box, a retaining ring, a first insulating plate, a bent plate, and a sealing cover. The retaining ring is spaced apart on the brush rod by the first insulating plate. Brush boxes are respectively provided on both sides of the retaining ring, and brushes are provided inside the brush boxes. One end of the brush rod is fixed to the motor base, and the other end of the brush rod is fixed to the bent plate. A sealing cover is provided on the outside of the stationary unit, and one end of the sealing cover is fixed to the motor base.

[0006] A rotating unit, fixed on a motor shaft, includes a locking plate, conductive busbars, insulating tubes, baffles, conductive rings, a second insulating plate, insulating bushings, and a sleeve. The sleeve is fitted onto the motor shaft. A locking plate is provided at the end of the motor shaft to limit the sleeve. An insulating bushing is provided on the outer circumference of the sleeve. Conductive rings are spaced apart on the insulating bushings by the second insulating plate. Conductive busbars are fixed on the conductive rings. An insulating tube is provided between the conductive busbars and the conductive rings. A baffle is provided at the end of the sleeve to limit the insulating bushings.

[0007] The surface of the conductive ring is in contact with the brush.

[0008] As a further improvement of the present invention, insulating washers are provided at both ends of the brush rod to separate the fixing rings located at both ends of the brush rod from other metal parts.

[0009] As a further improvement of the present invention, a plurality of annular grooves are provided at intervals on the outer circumference of the conductive ring.

[0010] As a further improvement of the present invention, a plurality of oblique ventilation holes are provided on both sides of the conductive ring, and a ventilation groove is provided in the middle of the conductive ring, the ventilation groove being interconnected with the oblique ventilation holes.

[0011] As a further improvement of the present invention, the oblique ventilation holes are evenly arranged around the ventilation slot.

[0012] As a further improvement of the present invention, the conductive ring is provided with a conductive bus mounting hole, and the conductive bus mounting hole is configured as a tapered hole.

[0013] As a further improvement of the present invention, the conductive busbar and the conductive ring are fixed together by a gasket.

[0014] As a further improvement to the invention, the conductive ring is provided with a plurality of weight-reducing and balancing holes, which are located near the conductive busbar.

[0015] The beneficial effects of this invention are as follows:

[0016] The structural design of the brush holder and slip ring complements each other. The brush holder solves the problem of insufficient installation space for the brushes, while the slip ring structure addresses the issues of high rotor current, poor ventilation of the conductive ring, and uneven heat dissipation. This improves the reliability of high-current wound-rotor motors and broadens the application areas of wound-rotor motors. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the overall structure of the present invention.

[0018] Figure 2 for Figure 1 Enlarged view of section B.

[0019] Figure 3 This is a schematic diagram of the axial cross-section of the present invention.

[0020] Figure 4 for Figure 3 Sectional view along the AA direction.

[0021] Explanation of reference numerals in the attached drawings: 1. Brush rod; 2. Brush; 3. Brush box; 4. Retaining ring; 5. First insulating plate; 6. Insulating washer; 7. Bent plate; 8. Locking plate; 9. Conductive busbar; 10. Insulating tube; 11. Baffle; 12. Conductive ring; 13. Second insulating plate; 14. Insulating bushing; 15. Sleeve; 16. Gasket; 17. Motor shaft; 18. Sealing cover; 19. Annular groove; 20. Angled ventilation hole; 21. Ventilation slot; 22. Conductive busbar mounting hole; 23. Weight reduction and balance hole; 24. Motor base. Detailed Implementation

[0022] The present invention will now be further described with reference to the embodiments shown in the accompanying drawings:

[0023] As shown in the figure, a rotor through-shaft conductive busbar lead-out structure for an externally sliding wound coil motor includes a stationary unit and a rotating unit;

[0024] The stationary unit is fixed on the motor base 24. The stationary unit includes a brush rod 1, a brush 2, a brush box 3, a fixing ring 4, a first insulating plate 5, a bending plate 7, and a sealing cover 18. The fixing ring 4 is spaced on the brush rod 1 through the first insulating plate 5. Brush boxes 3 are respectively provided on both sides of the fixing ring 4. The brush 2 is provided inside the brush box 3. One end of the brush rod 1 is fixed to the motor base 24, and the other end of the brush rod 1 is fixed to the bending plate 7. The stationary unit is provided with a sealing cover 18 on the outside, and one end of the sealing cover 18 is fixed to the motor base 24.

[0025] A rotating unit is fixed on a motor shaft 17. The rotating unit includes a locking plate 8, a conductive bar 9, an insulating tube 10, a baffle 11, a conductive ring 12, a second insulating plate 13, an insulating bushing 14, and a sleeve 15. The sleeve 15 is sleeved on the motor shaft 17. A locking plate 8 is provided at the end of the motor shaft 17 to limit the sleeve 15. An insulating bushing 14 is provided on the outer circle of the sleeve 15. Conductive rings 12 are provided on the insulating bushing 14 at intervals through the second insulating plate 13. A conductive bar 9 is fixed on the conductive ring 12. An insulating tube 10 is provided between the conductive bar 9 and the conductive ring 12. A baffle 11 is provided at the end of the sleeve 15 to limit the insulating bushing 14.

[0026] The surface of the conductive ring 12 is in contact with the brush 2. The brush 2 is generally made of metal graphite, which is both wear-resistant and tough and has high conductivity. It can reliably connect the rotor winding to the stationary fixed ring 4 so that an external power supply can be used to supply power to the rotor winding.

[0027] Insulating washers 6 are provided at both ends of the brush rod 1 to separate the fixing rings 4 located at both ends of the brush rod 1 from other metal parts.

[0028] The outer circumference of the conductive ring 12 is provided with multiple annular grooves 19 at intervals to increase the heat dissipation area of ​​the slip ring surface.

[0029] Multiple oblique ventilation holes 20 are provided on both sides of the conductive ring 12, and a ventilation groove 21 is provided in the middle of the conductive ring 12. The ventilation groove 21 is connected to the oblique ventilation holes 20. The oblique ventilation holes 20 are evenly arranged around the ventilation groove 21. In this way, the cooling air can cool the slip ring from the outside to the inside in the slip ring ventilation system, so that each conductive ring can be uniformly cooled.

[0030] The conductive ring 12 is provided with a conductive busbar mounting hole 22, which is a tapered hole. In order to improve the reliable connection between the conductive ring 12 and the conductive busbar 9, the joint between the conductive busbars is made into a tapered shape, which can better ensure the fit between the two when subjected to axial force during installation. The conductive busbar 9 and the conductive ring 12 are fixed by a gasket 16, which also aims to better ensure the fit between the two when subjected to axial force during installation.

[0031] The conductive ring 12 is provided with a plurality of weight-reducing and balancing holes 23. The weight-reducing and balancing holes 23 are located near the conductive busbar 9. The purpose of these holes is to balance the mass distribution of each part of the circumferential conductive ring 12 and prevent it from affecting the balance of the motor speed.

[0032] The working process of this invention is as follows:

[0033] When the motor is running, the external power supply is connected to the fixed ring 4. The current flows through the metal fixed ring and disperses to each brush 2. Due to its unique wear resistance, softness, and high conductivity, the brush 2 contacts the conductive ring 12 during rotor rotation, ensuring reliable current conduction to the conductive ring 12. The conductive ring 12 is reliably connected to the conductive busbar 9 through a tapered interface, ultimately connecting the current to the rotor windings through the conductive busbar 9, thus enabling the external power supply to power the rotor windings. As the motor capacity increases, the rotor current increases, and the heat generated by the conductive ring 12 also becomes more severe. However, using the unique heat dissipation structure of the conductive ring 12 in this patent, the external cooling air of the slip ring enters the ventilation groove 21 and then enters the oblique ventilation holes 20 on both sides, effectively and evenly dissipating heat at the root of each conductive ring 12, preventing the slip ring from being "cold on the outside and hot on the inside" during motor operation, and reducing the risk of backfire. In addition, the ventilation and heat dissipation of the spiral groove 19 on the outer circumference of the conductive ring effectively ensures the operational reliability of the high-capacity, high-rotor-current wound-rotor motor.

Claims

1. A rotor through-shaft conductive busbar lead-out structure for an externally sliding wound coil motor, characterized in that, include: A stationary unit is fixed on a motor base (24). The stationary unit includes a brush rod (1), a brush (2), a brush box (3), a fixing ring (4), a first insulating plate (5), a bending plate (7), and a sealing cover (18). The fixing ring (4) is spaced on the brush rod (1) through the first insulating plate (5). Brush boxes (3) are respectively provided on both sides of the fixing ring (4). The brush box (3) is provided with a brush (2) inside. One end of the brush rod is fixed on the motor base (24), and the other end of the brush rod (1) is fixed to the bending plate (7). A sealing cover (18) is provided on the outside of the stationary unit. One end of the sealing cover (18) is fixed on the motor base (24). A rotating unit is fixed on a motor shaft (17). The rotating unit includes a locking plate (8), a conductive bar (9), an insulating tube (10), a baffle (11), a conductive ring (12), a second insulating plate (13), an insulating bushing (14), and a sleeve (15). The sleeve (15) is sleeved on the motor shaft (17). A locking plate (8) is provided at the end of the motor shaft (17) to limit the sleeve (15). An insulating bushing (14) is provided on the outer circle of the sleeve (15). A conductive ring (12) is provided on the insulating bushing (14) at intervals through the second insulating plate (13). A conductive bar (9) is fixed on the conductive ring (12). An insulating tube (10) is provided between the conductive bar (9) and the conductive ring (12). A baffle (11) is provided at the end of the sleeve (15) to limit the insulating bushing (14). The surface of the conductive ring (12) is in contact with the brush (2); The outer circumference of the conductive ring (12) is provided with a plurality of annular grooves (19) at intervals. Multiple oblique ventilation holes (20) are provided on both sides of the conductive ring (12), and a ventilation groove (21) is provided in the middle of the conductive ring (12). The ventilation groove (21) is connected to the oblique ventilation holes (20). The oblique ventilation holes (20) are evenly arranged around the ventilation slot (21); The conductive ring (12) is provided with a plurality of weight-reducing balance holes (23), and the weight-reducing balance holes (23) are located near the conductive busbar (9).

2. The rotor through-shaft conductive busbar lead-out structure of an external sliding wound coil motor as described in claim 1, characterized in that, Insulating washers (6) are provided at both ends of the brush rod (1) to separate the fixing rings (4) located at both ends of the brush rod (1) from other metal parts.

3. The rotor through-shaft conductive busbar lead-out structure of an externally sliding wound coil motor as described in claim 1, characterized in that, The conductive ring (12) is provided with a conductive bus mounting hole (22), and the conductive bus mounting hole (22) is provided as a tapered hole.

4. The rotor through-shaft conductive busbar lead-out structure of an external sliding wound coil motor as described in claim 3, characterized in that, The conductive bus (9) and the conductive ring (12) are fixed together by a gasket (16).

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