JPS6148340B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a commutator, and an object of the present invention is to reduce sparks generated during commutation, reduce radio wave interference, and extend the life of the commutator.

A top view and a bottom view of an embodiment of the invention are shown in FIGS. 1 and 2, respectively. However, the second
For convenience of explanation, the figures are drawn with left and right reversed. In these figures, the first pole segment provided on the surface of the insulating substrate is the main segment C ₁ and the auxiliary segment.
The second pole segment consists of _{the main segment C 2 and the auxiliary segments C 21 , C 22 , C 23}
The third pole segment is the main segment.
It consists of C ₃ and auxiliary segments C ₃₁ , C ₃₂ , and C ₃₃ . The auxiliary segments C ₁₁ , C ₂₁ , and C ₃₁ are connected to the conductive layer RC ₁ on the back side of the insulating substrate by through holes φ ₁₁ , φ ₂₁ , and φ ₃₁ , respectively, and the auxiliary segments C ₁₂ ,
C ₂₂ and C ₃₂ are through holes φ ₁₂ , φ ₂₂ and φ respectively
The auxiliary segments C ₁₃ , C ₂₃ , C ₃₃ are connected to _the conductive layer RC ₃ by through holes φ ₁₃ , φ ₂₃ , φ ₃₃ , respectively _. A resistance layer R ₂ is connected between the conductive layers RC ₁ and RC ₂ , and a resistance layer R ₃ is connected between the conductive layers RC ₂ and RC ₃ . As a result, the auxiliary segment on the surface side
The resistance layer R ₂ on the back side is commonly connected between C ₁₁ and C ₁₂ , between the auxiliary segments C ₂₁ and C ₂₂ , and between the auxiliary segments C ₃₁ and C ₃₂ , and the auxiliary segments C ₁₂ on the front side,
This means that the resistance layer R ₃ on the back side is commonly connected between C ₁₃ , between the auxiliary segments C ₂₂ and C ₂₃ , and between the auxiliary segments C ₃₂ and C ₃₃ . On the other hand, the main segment
Separate external resistors R ₁₁ , R ₁₂ , R ₁₃ are connected between C ₁ , C ₂ , C ₃ and the auxiliary segments C ₁₁ , C ₂₁ , C ₃₁ , respectively. Further, the coils L ₁ , L ₂ , L ₃ are connected to the main segments C ₁ , C ₃ ; C ₁ , C ₂ ; C ₂ , C ₃ , respectively, and the brush pieces B ₁ , B ₁ ' of the brushes B, The brush pieces slide on the main segments C ₁ , C ₂ , C ₃ .
_B2 , _B2 ' are configured to slide over the main segments _C1 , _C2 , _C3 and the auxiliary segments _C11 - _C13 , _C21 - _C23 , _C31 - _C33 .

Next, the operation will be explained with reference to FIGS. 3A to 3F. The electrical circuit in the state shown in Figure 1 is
It will look like figure A.

When the commutator rotates clockwise from this state and the brush piece B ₁ is transferred onto the main segment C ₁ , the brush B shorts the coil L ₁ and the electric circuit is switched to the third
It will look like figure B. This period is the rectification period,
Coil _L1 becomes short-circuited, but cannot absorb enough rectification energy.

Next, when the brush piece B ₂ is transferred onto the auxiliary segment C ₃₁ , a resistor R ₁₃ is connected in parallel to the coil L ₁ as shown in FIG. 3C, thereby absorbing the rectifying energy. In this case, a resistor R ₁₂ is connected between the power supplies.

Next, when the brush piece B ₂ is transferred onto the auxiliary segment C ₃₂ , as shown in FIG. 3D, the coil L ₁
A series circuit of resistor R ₁₃ and resistive layer R ₂ is connected in parallel to absorb the rectification energy. In this case, the resistor R ₁₂ is connected between the power supplies through the resistive layer R ₂ , and the auxiliary segments C ₃₂ , ₂₂ , C ₁₂ are electrically connected, so a series circuit of the resistor R ₁₂ and the resistive layer R ₂ is created. is connected between the power supplies.

Next, when the brush piece B ₂ is transferred onto the auxiliary segment C ₃₃ , as shown in FIG. 3E, the coil L ₁
A series circuit of resistor _R13 , resistive layer _R2 , and resistive layer _R3 is connected in parallel to absorb the rectifying energy. In this case, a circuit network as shown in the figure will be connected between the power supplies.

Next, when the brush piece B ₂ transfers to the main segment C ₁ , the state shown in FIG. 3F is reached and the rectifying operation is completed.

In this way, in the process of the brush piece B ₂ transferring from the main segment C ₃ to the main segment C 1 via the auxiliary segments C ₃₁ to C ₃₃ , the resistance connected in parallel to _{the coil L 1 increases} sequentially and rectifies it. Because it absorbs energy, sparks can be reduced.

Further, since the resistance layers R ₂ and R ₃ are provided on the back surface of the insulating substrate and are common to each pole, the power capacity of the resistance layers can be increased and the number of resistance layers can be reduced.

In addition, in the embodiment, the auxiliary segments C ₁₃ ,
Even if C ₂₃ , C ₃₃ , resistors R ₁₁ , R ₁₂ , R ₁₃ and resistive layer R ₃ are removed, the intended purpose can be achieved.

As described above, in the commutator of the present invention, each pole segment formed on one surface of an insulating substrate is divided into a main segment and two or more auxiliary segments, and all of the pair of auxiliary segments of each pole segment are common. a resistance layer formed on the other surface of the insulating substrate to connect the common resistance layer between each pair of auxiliary segments, and a branched brush piece that slides only with respect to the main segment; and a brush having a branched brush piece that slides on both of the auxiliary segment groups, and this configuration provides the following effects.

In other words, sparks generated when the branch brush pieces slide against the auxiliary segment are reduced, reducing radio wave interference, extending the service life, increasing the power capacity of the resistive layer, and reducing the number of resistive layers. .

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a bottom view thereof, and FIGS. 3A to 3F are diagrams for explaining the operation. _C1 ~ _C3 ...Main segment, _C11 ~ _C13 , _C21 ~
C ₂₃ , C ₃₁ to C ₃₃ ... Auxiliary segment, R ₂ , R ₃ ...
Resistive layer, RC ₁ ~ _{RC 3} ... Conductive layer, φ ₁₁ ~ φ ₁₃ , φ ₂₁
~ _φ23 , _φ31 ~ _φ33 ...Through hole, _L1 ~ _L3 ...
... Coil, B, B... Brush, B ₁ , B ₂ ; B ₁ ′,
B ₂ ′...Brush piece.

Claims (1)

[Claims] 1. Divide each pole segment formed on one surface of the insulating substrate into a main segment and two or more auxiliary segments, and apply a common resistance layer for all pairs of auxiliary segments of each pole segment to the other surface of the insulating substrate. a branched brush piece that forms and connects the common resistance layer between each pair of auxiliary segments and that slides only with respect to the main segment; and with respect to both the main segment and each of the auxiliary segment groups. A commutator comprising a sliding branched brush piece and a brush having sliding branched brush pieces.