Commutator and manufacturing method thereof

Abstract

The invention discloses a commutator and a manufacturing method thereof. The commutator comprises an insulating columnar commutator base body (2), a plurality of commutator segments (3) arranged on the commutator base body (2), a plurality of connecting pieces (4) and an annular rheostat (5), wherein one end of each commutator segment (3) is provided with a hook (32); the annular rheostat (5) is arranged at the end of the commutator with the hook; and the end of each commutator segment (3) provided with the hook is electrically connected to a corresponding electrode (51) of the annular rheostat (5) through one connecting piece (4). The commutator of the invention is arranged in a rotor after the annular rheostat is arranged and fixed, and then a wire terminal of a coil is welded on the hooks of the commutator segments, so the commutator avoids the influence of an oxide film, makes the welding of the annular rheostat convenient and is easy to implement. In addition, the annular rheostats are electrically connected with the ends of the commutator segments (3) provided with the hooks, so the annular rheostat is closer to the coil and is of a higher EMC level.

Description

technical field [0001] The invention relates to the field of motors, in particular to a commutator of the motor and a method for manufacturing the commutator. Background technique [0002] Fig. 20 is a schematic diagram of a conventional commutator. As shown in Figure 20, the commutator includes a commutator base 2' and several commutator segments 3'. Wherein, the commutator base body 2' is an insulating hollow cylinder, and the commutator base body 2' is concentrically fixedly mounted on the rotating shaft 1' of the motor rotor, and can rotate along with the rotating shaft 1'. The commutator segments 3' are evenly installed on the commutator base 2', each commutator segment 3' is insulated from each other, and a part of the commutator segment 3' is embedded in the commutator base 2' to be fixed to the commutator Device base 2'. The coil end of the commutator piece 3' has a hook 32', and the wire end 4' of the coil is welded to the hook 32'. [0003] When the commutator ...

AI Technical Summary

Problems solved by technology

[0005] A defect of the solution shown in Figure 21 is that after the wire end 4' of the coil is welded to the hook 32' of the commutator segment, an oxide film will be formed on the surface of the wire end 4' and the hook 32' to prevent the wire end 4' from and hook 32' are oxidized

Because the oxide film is non-conductive, it is difficult to weld the electrode 51' of the ring varistor to the hook 32'; even if the welding is successful, it is difficult to ensure that the two are electrically connected

In addition, the annular varistor 5' is installed on the outer surface of the commutator segment 3', which is easily damaged by the outside

[0006] In addition, in the solution shown in Figure 21, the inner ring of the annular variable resistor is larger than the cylinder surrounded by the commutator segments. If the number of commutator poles is large or the output is large, a large-volume annular variable resistor will be required. resistance, and the existing ring varistor sintering technology is difficult to achieve large size ring varistor

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