Direct current motor

Abstract

The invention relates to the field of motors and discloses a direct current motor. The direct current motor comprises a rotor assembly (10), a stator assembly (20) and a bracket assembly (30) for packaging the rotor assembly (10) and the stator assembly (20). The rotor assembly (10) comprises a rotor body and an electric brush (13) mounted to the rotor body. The stator assembly (20) comprises a stator core (21) and a winding (22) which is fixed in an insulated mode relative to the stator core (21). The direct current motor further includes a commutator (23) electrically connected to the winding (22). The commutator (23) is fixed to the stator assembly (20) or the bracket assembly (30). According to the direct current motor of the present invention, the winding is arranged in the stator assembly, and so a rotating magnetic field is generated by the stator assembly.

Description

technical field [0001] The invention relates to the field of motors, in particular to a DC motor. Background technique [0002] The structure of the existing DC motor is usually as follows Figure 1 to Figure 3 In the shown situation, that is, the DC motor includes a rotor assembly 10, a stator assembly 20 and a bracket assembly 30, wherein: the rotor assembly 10 includes a rotating shaft 11, a rotor core 12, a rotor winding 15 and a commutator 23, and the rotor The iron core 12 and the rotor winding 15 are installed on the rotating shaft 11 in an insulated manner, and the rotor winding 15 is electrically connected to the commutator 23; the bracket assembly 30 includes an upper bracket 31' and a lower bracket 32', and the lower bracket 32' is provided with a commutator. The brush 13 that is in contact with the device 23. In use, a rotating magnetic field is generated by the rotor windings 15 of the rotor assembly 10 . Among them, the rotor assembly 10 rotates at a high spe...

AI Technical Summary

Problems solved by technology

Among them, the rotor assembly 10 rotates at a high speed, which will cause many problems, such as the commutator 23 is easy to be detached from the installation during high-speed rotation, resulting in the "flying piece" problem, and the rotor winding 15 is easy to loosen or displace under high-speed rotation and cause Problems such as large unbalance and large vibration of rotor assembly 10

In addition, in this structure, the commutator 23 needs to be turned to have an appropriate curved surface, but the ellipticity after turning and the jump between the commutator segments are large, resulting in large sparks in the DC motor and easy friction with the brush 13 noise

In addition, if figure 2 and 3 As shown, in this traditional structure, the brush 13 and the commutator 23 are in contact with the arc surface, and the brush 13 and the commutator 23 need to run for a long time before they can be completely worn in.

In addition, the running direction of the commutator 23 is single. If it is double-turning, the noise of the brush 13 jumping will be generated. If the problem is improved by reducing the gap between the brush 13 and the brush sleeve, the electric current will be generated. The problem of brushing 13 and brush cover stuck

Moreover, the static brush 13 is not conducive to the dissipation of heat, which may easily cause damage to the brush 13 or the brush holder.

In addition, such traditional DC motors used in home appliances generally have two poles (that is, a pair of stator poles), and at most four poles. If this DC motor is to be made into multi-poles, the size of the whole machine must It is difficult to meet the requirements of miniaturization of home appliances

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