All-plastic commutator with mica isolation

Abstract

The utility model discloses a fully plastic commutator with mica isolation, comprising a plastic substrate and a plurality of commutation copper sheets of the same structural shape which are integrally injection molded with the plastic substrate, characterized in that: multiple mica isolations of small blocks are arranged between adjacent commutation copper sheets, and the multiple mica isolations are composed of mutually independent small mica pieces located on the side of the welding wire step and the side of the main sheet body of the commutation copper sheet; when the commutator is not processed into a finished product outer circle, the small mica pieces on the side of the welding wire step and the side of the main sheet body are components of the connected large mica pieces, the small mica pieces on the side of the welding wire step are the main body top of the large mica pieces, and the small mica pieces on the side of the main body are the hook feet of the large mica pieces. The utility model not only improves the insulation strength between the commutator sheets while having the performance of a fully plastic commutator, but also prevents the problems of extrusion deformation, narrowing of the gap, easy breakdown and carbonization of the medium at the welding wire step during welding.

Description

Technical Field

[0001] The utility model relates to the technical field of commutators, in particular to a full-plastic commutator with mica isolation. Background Art

[0002] The advantage of the all-plastic commutator is that there is no mica sheet between adjacent commutation copper sheets for insulation isolation. The disadvantage is that there is only bakelite powder between the sheets for insulation isolation, and the dielectric strength of bakelite powder for insulation between sheets is weak. In addition, at the welding wire step of the commutator, because the welding wire slot is opened and the coil wire is welded and connected, the high temperature generated by welding will soften the plastic matrix at the welding wire step, and the adjacent commutation copper sheets will be squeezed and deformed at the welding wire step, resulting in a smaller gap between the adjacent commutation copper sheets at the welding wire step, so the plastic medium is easily broken down and carbonized. The commutator with mica sheets between adjacent commutation copper sheets for insulation isolation has improved the dielectric strength of the insulation between the sheets, but the mica sheets are easily thrown out from the outer cylindrical surface of the commutator when the commutator is running at high speed, resulting in a short service life. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a full-plastic commutator with mica isolation, which not only improves the insulation strength between the commutator segments, but also prevents problems such as extrusion deformation, narrowing of the gap, and easy breakdown and carbonization of the medium at the welding step during welding, while having the performance of a full-plastic commutator.

[0004] The utility model is implemented through the following technical solutions:

[0005] The all-plastic commutator with mica isolation comprises a plastic substrate and a plurality of commutation copper sheets of the same structural shape which are integrally injection molded with the plastic substrate, and is characterized in that: a plurality of mica isolations of small blocks are arranged between adjacent commutation copper sheets, and the plurality of mica isolations are composed of small pieces of mica which are independent of each other and are located on the side of the welding wire step and the side of the main sheet body of the commutation copper sheet; when the commutator is not processed into the outer circle of the finished product, the small pieces of mica on the side of the welding wire step and the side of the main sheet body are components of the connected large piece of mica, the small pieces of mica on the side of the welding wire step are the main body top of the large piece of mica, and the small pieces of mica on the side of the main body are the hook feet of the large piece of mica.

[0006] The hook feet of the large mica are provided at two locations, upper and lower.

[0007] The hook foot of large mica is in the shape of a dovetail.

[0008] The commutator adopting the above technical solution has the following beneficial technical effects: after the outer circle of the commutator is processed, only a plurality of mica isolations of small blocks are arranged between adjacent commutation copper sheets, and the commutator has the performance of a full-plastic commutator. Because the side of the welding wire step located on the commutation copper sheet has a small piece of mica for insulation isolation, it can be ensured that when the welding wire step of the commutator is welded to the coil conductor after the welding wire groove is opened, the high temperature generated by welding will not soften the small piece of mica at the welding wire step, thereby preventing the adjacent commutation copper sheets from being squeezed and deformed at the welding wire step. This will prevent the gap between adjacent commutation copper sheets at the welding wire step from becoming smaller, ensuring that the plastic medium is not punctured and carbonized; in addition, because the small piece of mica located on the side of the main sheet body ensures the insulation distance between adjacent commutation copper sheets, the dielectric strength of the insulation between the sheets can be effectively guaranteed and improved; in addition, because the small piece of mica located on the side of the main sheet body has a dovetail shape and is firmly combined with the plastic matrix, and is very light in weight, the problem of the commutator being easily thrown out from the outer cylindrical surface of the commutator when running at high speed is avoided, thereby ensuring the service life of the commutator. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model has the following drawings:

[0010] Figure 1 This is a top view of the all-plastic commutator with mica isolation of the utility model;

[0011] Figure 2 for Figure 1 View after removing the plastic matrix;

[0012] Figure 3 for Figure 2 AA direction view (after the commutator is finished with outer circle processing);

[0013] Figure 4 for Figure 3 View of the commutator without finished external machining. DETAILED DESCRIPTION

[0014] like Figure 1-3 As shown, the all-plastic commutator with mica isolation of the utility model comprises a plastic substrate 3 and twenty-five commutation copper sheets 2 of the same structure and shape which are integrally injection molded with the plastic substrate 3. Three mica isolations of small blocks are arranged between adjacent commutation copper sheets 2. The three mica isolations are composed of small mica pieces 3 located on the side of the welding wire step of the commutation copper sheet 2 and small mica pieces 4 and 5 located on the side of the main sheet body, which are independent of each other. When the commutator is not processed for the outer circle of the finished product (see Figure 4), small pieces of mica 3, small pieces of mica 4 and small pieces of mica 5 are components of a connected large piece of mica 6, small pieces of mica 3 is the main body top of the large piece of mica 6, small pieces of mica 4 and small pieces of mica 5 are the hook feet of the large piece of mica 6, the hook feet of the large piece of mica 6 are provided with two upper and lower parts, and the hook feet are in a dovetail shape.

Claims

1. A fully plastic commutator with mica isolation, comprising a plastic substrate and a plurality of commutation copper sheets of the same structure and shape integrally injection-molded with the plastic substrate, characterized in that: Multiple mica isolations of small blocks are arranged between adjacent commutation copper sheets, and the multiple mica isolations are composed of independent small mica pieces located on the side of the welding wire step and the side of the main sheet body of the commutation copper sheet; when the commutator is not processed into the finished outer circle, the small mica pieces on the side of the welding wire step and the side of the main sheet body are components of the connected large mica piece, the small mica piece on the side of the welding wire step is the main body top of the large mica piece, and the small mica piece on the side of the main body is the hook foot of the large mica piece.

2. The all-plastic commutator with mica isolation according to claim 1 is characterized in that: The hook feet of the large mica are provided at two locations, upper and lower.

3. The all-plastic commutator with mica isolation according to claim 1 or 2, characterized in that: The hook foot of large mica is in the shape of a dovetail.

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