Ultraminiature continuous current dynamo for facilitating commutator installation

Abstract

The invention relates to an ultraminiature continuous current dynamo for facilitating commutator installation, comprising a rotor, a stator and a brush group. The rotor comprises a rotor support and a winding; while the rotor support comprises a revolving shaft, a fixed ring sheathed at one end of the revolving shaft and a commutator located at one end of the revolving shaft. The brush group comprises a base plate at one end of a machine shell and an upper electric brush and a lower electric brush which are arranged on the base plate; the central part of the base plate, which is close to the machine shell is provided with center holes; each electric brush is provided with a straight panel part, a vertical part which vertical extends out from one end of the straight panel part and a slant part which slantly extends out from the other end of the straight panel part in a bent manner. Wherein, an end surface of the base plate, which is close to the machine shell is provided with a commutator installation slide rail, one end of the slide rail is communicated with the center holes, the lower edge of the slide rail is contacted with the edges of the center holes and the spacing between the lower edge of the slide rail and the slant part of the electric brush is equal to allowed deformation of the electric brush. With the structure adopted, when being installed, the commutator can slide along the lower edge of the slide rail to the center of the base plate, thus effectively avoiding deformation of the electric brush.

Description

technical field [0001] The invention belongs to the technical field of micro-motors, and in particular relates to an ultra-miniature DC motor which is convenient for installing a commutator. Background technique [0002] At present, micro DC motors are widely used in the fields of mobile communication and model aircraft, as the vibration source of mobile communication tools and the driving source of model aircraft. With the continuous development of mobile communication tools and aircraft model aircraft in the direction of stronger functions, smaller size, thinner and lighter weight, motors are also required to be smaller and more efficient. [0003] Such as figure 1 As shown, the existing micro-motor usually includes a rotor 1', a stator 2' and a brush group 3'. The rotor 1' includes a rotor frame 11' and a winding 12'. The rotor frame 11' includes a rotating shaft 111', a fixing ring 112' sleeved at one end of the rotating shaft 111', and a commutator 113' located at one...

AI Technical Summary

Problems solved by technology

The wire 4' of the existing motor can move up and down, left and right after being drawn out from the through hole 311'. like Figure 4 middle I'), friction occurs, and the root of the wire 4' is prone to fatigue and fracture

[0010] (3) In order to ensure the contact area between the pull tube 222' and the casing 21', as well as the adhesion between the pull tube 222' and the casing 21', the outer diameter of the pull tube 222' cannot be made too small. For small motors (such as ultra-miniature motors with a diameter of 3.2 mm), if the above structure is adopted, the wall thickness of the magnetic steel 223' is too thin and difficult to process. In addition, even if high magnetic NdFeB magnetic materials are used, the surface magnetism cannot reach According to the design requirements, the overall performance of the motor is too poor

[0011] (4) if Figure 5 As shown, the existing motor generally adopts three-pole commutation, and its commutator 113' has three commutator segments. Since the average voltage between the commutator segments is inversely proportional to the number of commutator segments, the potential difference is relatively large , the spark is large, which will affect the life of the motor and may generate electrical noise

[0012] (5) The existing motors generally use manual soldering to weld the brush 32' and the wire 4' together. However, the raw materials for soldering are not environmentally friendly, and the amount of tin used in manual soldering is too much, and the harmful gas discharged in the operation is relatively large. large, polluting the environment

On the other hand, since the brush 32' of the micro-motor is too small, the welding surface is very small, the operation of manual soldering is difficult and the efficiency is low

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