CN2036330U - Electric motor commutator - Google Patents

Abstract

The utility model relates to an electric motor commutator. The electric motor comprises a motor frame, a permanent magnet single stator supported by the motor frame, a winding armature provided with two commutators and two groups of brush gears cooperated with each corresponding commutator and supported by the motor frame. The armature is provided with two separation windings installed on a public stacked wafer module. The two windings are respectively connected with the two commutators, the windings and the commutators are connected in an electric mode in series, and the magnetic fluxes generated are mutually complemented. The two commutators are at best installed on two opposite ends of the armature.

Description

Electric motor commutator

The present invention relates to motor, and relate to small-power permanent magnet direct current motor (p.m.d.c. motor) in more detail.

Along with the increase of magnet magnetic energy product, the possibility that improves small-power p.m.d.c. power of electric motor-volume ratio has also increased.Owing to reduced the all-in resistance of motor winding, therefore, can improve the total input power of motor by increasing electric current.

This just produces various commutation problems.Usually made brush cross section optimization, to carry the motor current under the saturation level.If further increase the electric current that is transported to motor, then must increase the brush cross section, otherwise in commutation process, will cause serious fault.

In order to increase the brush cross section, can increase its arc length or axial length in theory, or the two increases simultaneously.Yet, a problem that is associated with its arc length is arranged, that is, because brush extends too widely, will make each commutator segment short circuit around commutator.If increase the diameter of commutator for this short circuit is disconnected, then will make major change about the geometry of brush assembling.The axial length that increases brush also means the axial length that increases commutator.Though this is feasible, on long commutator, keeps good circularity and will run into variety of issue.

In order to manage to overcome these problems, the invention provides a kind of motor, it comprises: the motor frame; Single stator of the magneto that is supported by described motor frame; Wound armature, the winding of two separation are installed on the common stacked wafer moudle, and its arrangement mode replenishes the magnetic flux of generation mutually; Two commutators, they are connected respectively on two windings, thereby, on electric, be communicated with each other; And two groups of brushgears, they are by described frame support, and, match with corresponding commutator.

The someone advises producing a kind of rotor winding with two separation, but has the small-sized DC motor or the motor generator of the permanent-magnet stator of two separation.Equally, the someone advises producing and a kind ofly has two rotor windings, but has the motor of single stator, and still, in each suggestion of described prior art, it is not to replenish mutually that the arrangement mode of described each rotor winding makes the magnetic flux of generation.

Yet, in the present invention, importantly have only single permanently magnetic stator, and it being to replenish mutually that the arrangement mode of described two separation windings makes the magnetic flux of generation, this is because demonstrate benefit of the present invention in these cases.

In motor of the present invention, described two commutators can be contained in an end of armature, still, it is contemplated that this will involve the various practical difficulties that outer commutator will be connected to described armature, therefore, the opposite end that two commutators are contained in armature respectively is favourable.

Preferably two groups of brushgear serial or parallel connections are connected according to required motor operating characteristic.

Only is that the motor frame comprises overcoat and two end caps that respectively support one a group of electric electromechanics brush device and a bearing that can support single stator.

Now will be by way of example, and with reference to the accompanying drawings the present invention is described in more detail.

Fig. 1 is a cross-section side view of implementing DC miniature motor of the present invention.

With reference to figure 1, shown in motor comprise by mild steel cover or manage the motor frame 10 that 11 and two end caps of generally being made by plastics (such as nylon) or oxide-film aluminium 12 and 13 are constituted and wound armature 15 is housed and the motor rotary shaft 14 of two commutators 16 and 17 that described two commutators are contained in respectively on the two ends of armature 15.

Described commutator 16 and 17 and armature 15 be fastened in the rotating shaft 14.This armature has the winding 26,27 of two separation, and they are contained on the public stacked wafer moudle 28.Two windings respectively are connected respectively to two commutators in known mode in the prior art, and the magnetic flux of two winding generations is to replenish mutually.

Each end cap 12,13 is equipped with a bearing 18, and the latter can be a kind of self-align bearing, and described rotating shaft 14 is with bearing 18 supportings.Two or one of them end cap also can have the ventilation hole (not shown), so that the ventilation of motor interior.

Each end cap 12,13 respectively supports one group of brushgear that comprises a pair of carbon brush 19, and brush leaf 20 is pushed against on the corresponding commutator carbon brush.One group of brushgear (brushgear at motor right-hand member shown in the drawings place) brush leaf 20 is connected on the power card reed 21, according to required motor performance, by the aerial lug (not shown) with two groups of brushgear connections in series or in parallel with each other.

The single permanently magnetic stator of overcoat 11 supporting, this stator are that the form with two blocks of permanent magnets 22 occurs, and magnet 22 leans against on the corresponding tang 24 at axial edge 23 places, and is pushed open by " U " shape springs 25 at other each axial edge places.Another kind method is that overcoat 11 can support a single stator of being made up of suitable magnetized ring shape permanent magnet.

The most useful is that magnet 22 can be a kind of high energy rare-earth magnet, for example nd-fe-b alloy magnet.

With end cap 12 and 13 with predetermined angle to fixed-site to overcoat 11, so that determine the orientation of brushgear with respect to magnet 22.Can reach this purpose by the recess that the projection that a receivability corresponding end covers is set on each end of overcoat 11, and it is out of shape avoid end cap 13 to separate with overcoat 11 with 14 by on each part of holding of sleeve or a few part, knocking with toe.

By two commutators (arrangement mode of described winding replenishes the magnetic flux of generation mutually) are set in the motor with the single stator of magneto and two windings that separate, just can must not increase the cross section of brush to the motor bigger electric current of input, in order to avoid produce the difficulty of the various associations of discussing the front.Because two commutators and two brushgears are set, therefore, can be along with two groups of brushgears are interconnected into serial or parallel connection on electric and change the motor operating characteristic.

The foregoing description only provides as an example, and in the art professional, obviously can realize various changes under the situation that does not break away from the scope of the invention that is limited by appended claims.

Claims (6)

1, a kind of motor is characterized in that comprising: the motor frame; By the single stator of the magneto of described rack support; Have and be installed on the public stacked wafer moudle and two wound armatures that separate windings that magnetic flux that its arrangement mode makes generation replenishes mutually; Be connected respectively to two windings and series connection is communicated with on electric two commutators and by rack support, and two groups of brushgears cooperating with each commutator respectively.

2, as desired motor in the claim 1, it is characterized in that: described two commutators are installed on the relative two ends of armature.

3, as desired motor in the claim 2, it is characterized in that: described motor frame comprises overcoat and two end caps that support one a group of electric electromechanics brush device and a bearing separately that support described single stator.

4, as desired motor in the claim 1, it is characterized in that: two groups of brushgears are connected in series mutually on electric.

5, as desired motor in the claim 1, it is characterized in that: two groups of brushgears are in parallel mutually on electric.

6, as desired motor in the claim 1, it is characterized in that: described motor is a kind of small power motor.