CN2330085Y

CN2330085Y - Electrical brush

Info

Publication number: CN2330085Y
Application number: CN 97239570
Authority: CN
Inventors: 王锐
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-25
Filing date: 1997-04-25
Publication date: 1999-07-21
Anticipated expiration: 2007-04-25

Abstract

The utility model relates to a novel electrical brush for a motor. The working zone of the utility model, which can actuality contact a commutator is composed of a resistance changing zone and a good conductor zone, wherein, the resistance changing zone is made from composite material with different electrical. The conductivity on the cross section which is perpendicular to the main current direction of the electric brush, the conductivity along the direction of relative movement between the electric brush and the commutator of the motor is gradually reduced from some center position to both sides and until zero. The utility model which can improve the turning of the motor and reduce a turning spark is especially suitable for a large-scale a pulsating current motor.

Description

Brush

The utility model relates to a kind of motor brush, especially large-scale pulse current electric motor brush.

The brush of motor use at present generally all is made of commaterial, and each point has identical conductance in the brush.Because each side such as motor manufacturings, assembling, use maintenance, during machine operation, be in the closed-loop path that commutation element and brush below the brush are formed, can add the current of commutation because of synthesizing non-vanishing generation of electromotive force.This electric current is crossed conference makes the commutation deterioration spark occur, can endanger motor when serious and normally move, and burns damage etc. as commutator ring.Improve motor commutation, the approach that reduces spark is to reduce synthetic potential value and increase commutation element resistance in circuit value in the commutation element.Realize that from brush above-mentioned purpose is to increase the contact resistance resistance that itself reaches with the commutator contact-making surface, yet the excessive normal water conservancy diversion of brush that can influence again of resistance, produce big thermal losses and adverse consequences thereof, thereby the brush of large-size machine has all just adopted division formula structure at present, although played certain effect, the not harm that fundamentally solves the additional current of commutation and bring.

The purpose of this utility model just provides a kind of brush, and the problems referred to above are effectively solved.

The purpose of this utility model is achieved in that to adopt level or stepless method, brush and commutator can actual contact the cross section vertical, service area with main current flow direction in the brush on, prolong brush and commutator direction of relative movement, make its conductance begin to reduce gradually to make it form good conductor district and resistance variation zone until being zero to both sides by the position, center.Therefore, entering or leave its electric current of element that brush commutates below will increase because of the restriction of brush resistance or reduce gradually.The resistance characteristic that the brush edge is bigger, will increase the resistance value of commutation element closed-loop path, especially when element commutation beginning or end, its loop will progressively carry out the transition to open-circuit condition, thereby can play the effect that restriction adds the current of commutation, make the normal water conservancy diversion of brush unaffected simultaneously.

Owing to adopt such scheme, be in the commutation element below the brush, along with away from the brush center, its additional current of commutation will reduce gradually until being zero, thereby can improve motor commutation, reduce electrical fault.

Below in conjunction with accompanying drawing the utility model is further specified:

Fig. 1 is profile and the conductance curve chart of first embodiment of brush.

Fig. 2 is profile and the conductance curve chart of second embodiment of brush.

A prolongs brush and the commutator direction of relative movement is a directions X among the figure, and is in contact with one another the brush profile of face perpendicular to it; B is that directions X each point conductance ρ scatter chart is prolonged in a figure center brush service area.Wherein 1, two soft line 2, top briquetting 3, good conductor district 4, good conductor interface 5, have different conductance ρ thin slice 6, by the 5 change in resistance districts 7 that form, dotted line be insulator interface 8, insulating barrier 9, non-conductor or insulant 10, by the 9 change in resistance districts that form.

In Fig. 1, thin slice with different conductance ρ (5) is laminated (3) two sides in good conductor district, brush center successively by conductance ρ is descending, form change in resistance district (6), the outside, change in resistance district (6) overlays insulating barrier (8), forming insulator interface with insulant between each thin slice (5) and good conductor district (3) is dotted line (7), form good conductor interface (4) between each thin slice top and good conductor district (3), make brush service area conductance ρ prolong the directions X distribution and meet curve shown in Fig. 1 b.

In Fig. 2, non-conductor or insulant (9) are dissolved in formation change in resistance district (10) in the brush body, the how little density of dissolving in bad lead or insulant (9) that shown of the interior point in change in resistance district (10), the outside, change in resistance district (10) forms insulating barrier (8), makes brush service area conductance prolong the directions X distribution and meets curve shown in Fig. 2 b.

In two figure, two soft lines (1) pass the both sides apical position that its brush top briquetting (2) is cast into good conductor district (3) respectively; Good conductor district (3) forms the bifurcation shape shape of separating and surrounding change in resistance district (6) or (9), and fits naturally with top briquetting (2).

Claims

1, a kind of brush, it is characterized in that: the brush service area is made up of with change in resistance district two parts that composite material by different conductances forms the good conductor district, prolong the brush and the mutual direction of motion of motor commutator on the cross section vertical with main current flow direction in the brush, its conductance is begun progressively to reduce to the edge, both sides until being zero by the position, center.

2, brush according to claim 1 is characterized in that: the good conductor district manifests the bifurcation shape of separating and surrounding the change in resistance district.

3, brush according to claim 1 is characterized in that: the change in resistance district is made up of the thin slice stack.

4, brush according to claim 1 is characterized in that: the change in resistance district is dissolved in by the poor conductor material and forms.

5, brush according to claim 1 is characterized in that: between two soft lines and good conductor casting point the solid space straight line apart be not less than brush and motor commutator direction of relative movement thickness 1/2nd.