Commutator
By introducing structures such as V-shaped grooves, retracting grooves and insulating gaps into the commutator, combined with annular and strip reinforcement plates, the problem of the lead wire breaking of the existing commutator under heavy load conditions is solved, and the mechanical performance is improved and stability ensures normal operation of high-speed rotation for a long time.
Patent Information
- Application Number
- CN202420979081.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-08
AI Technical Summary
When existing mica tank commutators rotate for a long time on heavy load tools, the lead wire is prone to breaking, resulting in limited mechanical and overspeed performance.
A commutator including an insulating sleeve, a copper commutator, a mica piece, annular reinforcement plate and a strip reinforcement plate were designed. The structures such as V-shaped groove, a retracting groove, a wire insertion groove and an insulating gap are strengthened. The stability and strength of the commutator are achieved to prevent the lead wire from swinging and the inflow of encapsulation glue.
It effectively prevents the lead-out line breakage and the inflow of encapsulation glue, improves the mechanical performance and stability of the commutator, and ensures normal operation during long-term high-speed rotation under heavy load conditions.
Smart Images
Figure CN222214749U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of commutators, in particular to a commutator. Background Art
[0002] At present, the power of motors in heavy-load (electric hammer) tools is getting bigger and bigger, the load is getting bigger and bigger, but the size is getting smaller and smaller, and the design and process requirements of motors are becoming more and more stringent. It is necessary to redesign and optimize the key components and processes of motors to meet these high-demand tools; among them, the commutator is the core component of the brushless motor; when the motor rotates, the brush commutates on the surface of the commutator, and it is mainly used in DC brushless micro motors; its technical performance indicators and product quality directly affect the overall performance of the motor.
[0003] A Chinese patent discloses a mica groove type commutator (authorization announcement number CN105958294B). The patented technology has at least three hooks arranged in the vertical direction of the commutation copper sheet, with a lateral opening left between the upper and lower hooks. The width of the lateral opening is greater than the height of the reinforcement ring. Each hook has the same L-shaped structure, and each L-shaped structure surrounds a reinforcement ring groove for placing a reinforcement ring. It has more than two reinforcement rings to improve the structural strength of the groove type commutator, thereby improving the mechanical properties and overspeed performance of the groove type commutator. However, when it is used on a heavy-load tool, the lead wire is easily broken during the long-term rotation of the commutator. Utility Model Content
[0004] The purpose of the utility model is to provide a commutator to solve the problems raised in the above background technology.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A commutator comprises an insulating sleeve, and a plurality of copper commutator segments uniformly distributed in an annular shape on the outside of the insulating sleeve, a mica sheet being fixedly connected between each two adjacent copper commutator segments, a wire embedding groove being provided in the middle of the outside of each copper commutator segment, a V-shaped groove being provided on the outside of the copper commutator segment at the front side of the wire embedding groove, and a tool withdrawal groove being provided on the outside of the copper commutator segment at the rear side of the wire embedding groove, and strip-shaped bayonet holes being provided at the lower ends of both sides of the copper commutator segment.
[0007] As a further solution of the utility model: an annular reinforcement plate is arranged inside the insulating sleeve in the circumferential direction, and a plurality of strip reinforcement plates are arranged inside the insulating sleeve in the axial direction.
[0008] As a further solution of the utility model: a mounting block is fixedly connected to the outside of the insulating sleeve between each two adjacent copper commutator segments, a recessed slot is provided at the upper end of each mounting block, and protruding blocks are fixedly connected at both ends of each mounting block.
[0009] As a further solution of the utility model: the lower end of the mica sheet is embedded in the inner side of the recessed slot, and each of the raised blocks is respectively embedded in the corresponding strip-shaped slot.
[0010] As a further solution of the utility model: an insulating gap is provided between every two adjacent copper commutator segments and on the outside of the mica sheet.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] The utility model can not only prevent the lead wire from swinging left and right in the wire embedding groove through the V-shaped groove, but also prevent the lead wire from being cut when embedded in the V-shaped groove; the tool withdrawal groove can prevent the encapsulating glue from flowing into the insulating gap when the amount of encapsulating glue is required to be increased on a heavy-load tool; the strength of the insulating sleeve is improved by the annular reinforcing plate and the strip reinforcing plate, so as to prevent the insulating sleeve from being deformed during long-term high-speed rotation. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of a commutator;
[0014] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;
[0015] Figure 3 It is a partial cross-sectional schematic diagram of a commutator;
[0016] Figure 4 A schematic cross-sectional view of a copper commutator segment in a commutator;
[0017] Figure 5 It is a schematic diagram of a partial cross-sectional structure of an insulating sleeve in a commutator;
[0018] Figure 6 It is a structural schematic diagram of the installation of a commutator and an armature shaft;
[0019] Figure 7 The figure is a schematic diagram of the structure of a commutator covered with encapsulating glue.
[0020] In the figure: 1. Insulating sleeve; 2. Copper commutator segment; 3. Insulating gap; 4. Back-off groove; 5. Wire embedding groove; 6. V-shaped groove; 7. Strip bayonet; 8. Ring reinforcement plate; 9. Strip reinforcement plate; 10. Mica sheet; 11. Raised card block; 12. Recessed card slot; 13. Mounting block; 20. Armature shaft; 30. Armature core; 40. Encapsulating glue. DETAILED DESCRIPTION
[0021] See also Figures 1 to 7 In the embodiment of the utility model, a commutator comprises an insulating sleeve 1, and a plurality of copper commutator segments 2 uniformly distributed in an annular shape on the outside of the insulating sleeve 1, a mica sheet 10 is fixedly connected between each two adjacent copper commutator segments 2, and the adjacent copper commutator segments 2 are isolated by the mica sheet 10, so that any two copper commutator segments 2 are insulated to prevent short circuit; a wire embedding groove 5 is provided in the middle of the outer side of each copper commutator segment 2, a V-shaped groove 6 is provided on the outer side of the copper commutator segment 2 at the front side of the wire embedding groove 5, and a backing groove 4 is provided on the outer side of the copper commutator segment 2 at the rear side of the wire embedding groove 5, and a strip bayonet 7 is provided at the lower end of both sides of the copper commutator segment 2; the commutator is mounted on the armature shaft 20, such as Figure 6 As shown, the coil lead wires on the armature core 30 are regularly embedded in the wire embedding groove 5 from the V-shaped groove 6, and then the lead wires are welded to the copper commutator segment 2, so that the copper commutator segment 2 and the coil form a passage, and the encapsulation glue 40 is covered on the wire embedding groove 5 and the V-shaped groove 6, as shown in FIG. Figure 7 As shown; the V-shaped groove 6 can not only prevent the lead wire from swinging left and right in the wire embedding groove 5, but also ensure that when the lead wire is embedded in the V-shaped groove 6, it can avoid cutting the lead wire when the lead wire turns; the backing groove 4 can prevent the encapsulating glue from flowing into the insulating gap 3 when the encapsulating glue amount is increased on the heavy-load tool.
[0022] exist Figure 3 In the figure, an annular reinforcement plate 8 is arranged circumferentially inside the insulating sleeve 1, and a plurality of strip reinforcement plates 9 are arranged axially inside the insulating sleeve 1. The annular reinforcement plate 8 and the strip reinforcement plates 9 are used to improve the strength of the insulating sleeve 1 and prevent the insulating sleeve 1 from deforming during long-term high-speed rotation.
[0023] exist Figure 3 , Figure 4 and Figure 5In the embodiment, a mounting block 13 is fixedly connected to the outer side of the insulating sleeve 1 between each two adjacent copper commutator segments 2, a recessed card slot 12 is provided at the upper end of each mounting block 13, and a protruding card block 11 is fixedly connected to both ends of each mounting block 13, the lower end of the mica sheet 10 is embedded in the inner side of the recessed card slot 12, and each protruding card block 11 is respectively embedded in the corresponding strip-shaped card slot 7, thereby improving the stability between the copper commutator segments 2, the mica sheet 10 and the insulating sleeve 1, and ensuring the quality of the commutator.
[0024] exist Figure 1 and Figure 3 In the embodiment, an insulating gap 3 is provided between each two adjacent copper commutator segments 2 and on the outside of the mica sheet 10. The insulating gap 3 makes the height of the mica sheet 10 lower than the height of the copper commutator segment 2, so as to prevent the copper commutator segment 2 from protruding from the copper commutator segment 2 due to wear and contact with the brush during long-term high-speed rotation, thereby affecting the contact between the brush and the copper commutator segment 2, causing commutation deterioration, and the motor cannot operate normally.
[0025] The working principle of the utility model is as follows: the steering gear and the armature core 30 are mounted on the armature shaft 20, and the coil is mounted on the armature core 30; the coil lead wire is regularly embedded in the wire embedding groove 5 from the V-shaped groove 6, and the lead wire is welded together with the copper commutator segment 2, and the wire embedding groove 5 and the V-shaped groove 6 are covered with an encapsulating glue 40; the brush is in contact with one of the copper commutator segments 2, and when the brush is energized, the current is transmitted to the copper commutator segment 2, and the alternating current in the winding is converted into direct current between the brushes, or the frequency of the alternating current between the brushes is adjusted in the AC motor; the armature shaft 20 and the armature core 30 rotate together with the commutator, and during the rotation of the commutator, the brush is connected with one of the copper commutator segments 2 at any time.
[0026] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.
Claims
1. A commutator, comprising an insulating sleeve (1), and a plurality of copper commutator segments (2) uniformly distributed in an annular shape on the outside of the insulating sleeve (1), characterized in that: A mica sheet (10) is fixedly connected between each two adjacent copper commutator segments (2), a wire embedding groove (5) is provided in the middle of the outer side of each copper commutator segment (2), a V-shaped groove (6) is provided on the outer side of the copper commutator segment (2) at the front side of the wire embedding groove (5), and a knife retreat groove (4) is provided on the outer side of the copper commutator segment (2) at the rear side of the wire embedding groove (5), and strip-shaped bayonet (7) is provided at the lower end of both sides of the copper commutator segment (2).
2. A commutator according to claim 1, characterized in that: An annular reinforcement plate (8) is arranged inside the insulating sleeve (1) in the circumferential direction, and a plurality of strip reinforcement plates (9) are arranged inside the insulating sleeve (1) in the axial direction.
3. A commutator according to claim 1, characterized in that: A mounting block (13) is fixedly connected to the outside of the insulating sleeve (1) between each two adjacent copper commutator segments (2), a recessed card slot (12) is provided at the upper end of each mounting block (13), and raised card blocks (11) are fixedly connected to both ends of each mounting block (13).
4. A commutator according to claim 3, characterized in that: The lower end of the mica sheet (10) is embedded in the inner side of the recessed card slot (12), and each of the protruding card blocks (11) is respectively embedded in a corresponding strip-shaped card slot (7).
5. A commutator according to claim 1, characterized in that: An insulating gap (3) is provided between every two adjacent copper commutator segments (2) and located outside the mica sheet (10).