JPS5843418Y2 - motor commutator - Google Patents

Description

【考案の詳細な説明】 本考案はモータの整流子に関するものであり、その目的
とするところは、刷子の共振発生を防ぐことができるモ
ータの整流子を提供するにある。[Detailed Description of the Invention] The present invention relates to a motor commutator, and its purpose is to provide a motor commutator that can prevent brush resonance.

一般ニ所謂マイクロモータのようなｌＪ型全モータ場合
、各構成部品は共通とし、コイル仕様のみ変えて異なる
回転数、トルクの用途に用いられることが多く刷子は必
らず、固有の共振周波数を持つので、使用回転数範囲が
広い際、特定の回転数で共振して使用できない場合があ
るという欠点があった。In general, all LJ type motors, such as so-called micro motors, have the same component parts, and are often used for applications with different rotation speeds and torques by changing only the coil specifications. Therefore, when using a wide range of rotation speeds, there is a drawback that resonance may occur at a specific rotation speed, making it unusable.

即ち第１図において刷子３の加振力を刷子圧と逆向きの
力で考えると、刷子３は整流子５の各セグメント１間を
絶縁分離する極切替え溝２を渡るときに大きな加振力を
受けることになる。That is, if we consider the excitation force of the brush 3 as a force in the opposite direction to the brush pressure in FIG. will receive.

そこで刷子３の固有振動数をｆとし、周期をＴとすると
極切替え溝２の溝１１ｆｆｌＢがｎ＝告に略一致しセグ
メント１０幅Ｄ＝ ｎ Ｂ （ｎ＝ １．２・・・）と
なるとき毎極の極切替え溝２で同位相の加振力を受ける
ことになるので、刷子３が非常に共振し易くなるのであ
る。Therefore, if the natural frequency of the brush 3 is f and the period is T, then the groove 11fflB of the pole switching groove 2 approximately matches n = , and the segment 10 width D = n B (n = 1.2...). Since the pole switching grooves 2 of each pole receive excitation forces of the same phase, the brush 3 is very likely to resonate.

また共振を避けるためには、ＴＮ２Ｂの回転数で使用す
るか、Ｄ”５ｎＢとなるように谷幅り、Ｂを決めれば良
いが、溝幅Ｂは加振力を小さくする置床では、できるだ
け小さい方が良く、整流子５の外形寸法によって、幅り
、Ｂ寸法関係が制約を受けることが多い。In addition, in order to avoid resonance, it is best to use the rotation speed of TN2B or to determine the groove width and B so that it becomes D"5nB, but the groove width B should be kept as small as possible when placed on a floor that reduces the excitation force. However, the relationship between the width and the B dimension is often restricted by the external dimensions of the commutator 5.

また幅り、Ｂの各寸法精度を低くしてばらつきをある程
度持たせると、Ｄ＝ｎＢとなるのは防止できて、共振防
止面から見れば好都合である。Furthermore, if the dimensional precision of the width and B is reduced to allow some variation, it is possible to prevent D=nB, which is advantageous from the perspective of preventing resonance.

しかしながら単に寸法精度を低くくすることは刷子３と
整流子５との最適整流角度を精度よく得ることができな
くなり問題がある。However, simply reducing the dimensional accuracy poses a problem as it becomes impossible to accurately obtain the optimum commutating angle between the brush 3 and the commutator 5.

さた平板状の整流子５の場合、幅り、Ｂの寸法割合は回
転半径により異なり、刷子３も一般げ複数個の刷子片３
ａを第２図に示すように有するので、ある刷子片３ａの
通過部分では極切替え溝２，２間の距離つまりセグメン
ト１０幅りを０％ ｎ Ｂと設定しても、他の刷子片３
ａではＤ＝ｎＢとなって、刷子３が結局共振し、電波障
害、寿命等の阻害要因となるという欠点がある。In the case of a flat commutator 5, the width and the dimensional ratio of B vary depending on the radius of rotation, and the brush 3 is generally made up of a plurality of brush pieces 3.
a as shown in FIG. 2, so even if the distance between the pole switching grooves 2, 2, that is, the width of the segment 10 is set to 0% nB in the passage part of a certain brush piece 3a, other brush pieces 3a
In case a, D=nB, and the brush 3 eventually resonates, which has the disadvantage of causing interference with radio waves, shortening the service life, and the like.

本考案は上述の問題点に鑑みて提供したもので、以下実
施例にて説明する。The present invention has been proposed in view of the above-mentioned problems, and will be explained below with reference to Examples.

第３図は本考案の一実施例の整流子５の斜視図を示し、
整流子５の各セグメント１を分離して絶縁する極切替え
溝２以外に、各セグメント１の刷子３の軌跡上に、共振
防止用の凹溝４を設けである。FIG. 3 shows a perspective view of a commutator 5 according to an embodiment of the present invention,
In addition to the pole switching grooves 2 for separating and insulating each segment 1 of the commutator 5, a groove 4 for preventing resonance is provided on the locus of the brush 3 of each segment 1.

この凹溝４を設ける場合には銅面積層板上にセグメント
１を形成するため接点金属鍍金を施す方法をとればよく
、凹溝４形戊位置に錠金が施されないように吹り、或い
はエツチングで銅箔を削除したりする。When providing this groove 4, it is sufficient to apply contact metal plating to form the segment 1 on the copper laminate, and to do so by blowing so that a lock is not applied at the position where the groove 4 is formed. The copper foil can be removed by etching.

第４図は凹溝４に錠金が施されていない状態を示す断面
図である。FIG. 4 is a sectional view showing a state in which the groove 4 is not fitted with a lock.

そして極切替え溝２と、との極切替え溝２の位置より回
転方向の前方及び後方位置に並設された凹溝４との間の
距離Ａ及びＡ′は前記極切替え溝２の溝幅Ｂの寸法に対
して１倍より大きな非整数倍とし、オた凹溝４の幅寸法
を極切替え溝２より小さくしである。The distances A and A' between the pole switching groove 2 and the concave grooves 4 arranged in parallel at positions forward and backward in the rotational direction from the position of the pole switching groove 2 are the groove width B of the pole switching groove 2. The width of the groove 4 is made smaller than that of the pole switching groove 2.

尚実施例では距離ＡをＡ′と等しくしていない。In the embodiment, the distance A is not made equal to A'.

しかして、回転中の整流子５からの加振力は凹溝４を刷
子３が乗越える際に乱されることとなり、刷子３の固有
共振周波数による共振が起りにくくなって、刷子３の各
刷子片３ａは整流子５に対して、安定追従する。Therefore, the excitation force from the rotating commutator 5 is disturbed when the brush 3 crosses the groove 4, and resonance due to the natural resonance frequency of the brush 3 is less likely to occur, and each of the brushes 3 The brush piece 3a follows the commutator 5 stably.

尚、積層板に接点金属箔を貼付ける場合には第５図で示
した別の実施例のように凹溝４を適宜手段で陥設しても
勿論よく、寸た第６図で示した他の実施例のように各セ
グメント１に凹溝４を切込み形成してもよく、この場合
、凹溝４の両側部分が電気的に絶縁されないように連続
部分Ｘを残しておく。Incidentally, when attaching the contact metal foil to the laminate, the grooves 4 may of course be recessed by appropriate means as shown in another embodiment shown in FIG. As in other embodiments, the grooves 4 may be cut into each segment 1, and in this case, a continuous portion X is left so that both side portions of the grooves 4 are not electrically insulated.

本考案は平板状の整流子の各セグメント間を分離するた
めに整流子の中心より放射状に略等間隔に削設された極
切替え溝の夫々に並行するように当該極切替え溝の回転
方向の前後側位置でかつ各セグメントの刷子軌跡上に凹
溝な夫々設け、対応する凹溝と極切替え溝との間の距離
を極切替え溝の溝幅の非整数倍の距離に設定するととも
に、極切替え溝の幅を凹溝の幅より大きくしであるので
、捷ず凹溝で刷子の力唾力を乱れさせるとともに小さく
し、その後凹溝を越え極切替え溝に至った刷子は凹溝と
極切替え溝との距離と極切替え溝の幅とを非整数倍とし
であるから共振が防止されるものであって、刷子の刷子
片の整流子に対する安定追従が広い使用回転数領域で得
られるという利点を有する。In order to separate each segment of a flat commutator, the present invention has been developed so that the direction of rotation of the pole switching grooves is parallel to each of the pole switching grooves, which are cut radially from the center of the commutator at approximately equal intervals. Concave grooves are provided at the front and rear positions and on the brush locus of each segment, and the distance between the corresponding concave groove and the pole switching groove is set to a distance that is a non-integral multiple of the groove width of the pole switching groove. Since the width of the switching groove is larger than the width of the concave groove, the force of the brush is disturbed and reduced in the concave groove without being separated, and then the brush that crosses the concave groove and reaches the pole switching groove is connected to the concave groove and the pole. Since the distance from the switching groove and the width of the pole switching groove are set to a non-integral multiple, resonance is prevented, and stable tracking of the brush piece of the brush to the commutator can be achieved over a wide range of operating speeds. has advantages.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来例の動作説明図、第２図は同上のロータの
斜視図、第３図は本考案−実施例の斜視図、第４図は同
上の動作説明図、第５図は本考案の別の実施例の要部拡
大断面図、第６図は本考案の他の実施例の拡大斜視図で
あり、１はセグメント、２は極切替え溝、３は刷子、４
■溝、５は整流子、Ａは凹溝と極切替え溝との距離、Ｂ
は切替え溝の溝幅、Ｃは凹溝の溝幅である。Fig. 1 is an explanatory diagram of the operation of the conventional example, Fig. 2 is a perspective view of the same rotor as above, Fig. 3 is a perspective view of the present invention-embodiment, Fig. 4 is an explanatory diagram of the operation of the same as the above, and Fig. 5 is the same as the present invention. FIG. 6 is an enlarged perspective view of another embodiment of the invention, in which 1 is a segment, 2 is a pole switching groove, 3 is a brush, and 4 is an enlarged perspective view of another embodiment of the invention.
■ Groove, 5 is the commutator, A is the distance between the concave groove and the pole switching groove, B
is the groove width of the switching groove, and C is the groove width of the concave groove.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 平板状の整流子の各セグメント間を分離するために整流
子の中心より放射状に略等間隔に削設された極切替え溝
の夫々に並行するように当該極切替え溝の回転方向の前
後周位置でかつ各セグメントの刷子軌跡上に凹溝を夫々
設け、対応する凹溝と極切替え溝との間の距離を極切替
え溝の溝幅の非整数倍の距離に設定するとともに、極切
替え溝の幅を凹溝の幅より大きくして成ることを特徴と
するモータの整流子。In order to separate each segment of the flat commutator, the front and rear peripheral positions of the pole switching grooves in the rotational direction are parallel to each of the pole switching grooves that are cut radially from the center of the commutator at approximately equal intervals. A groove is provided on the brush trajectory of each segment, and the distance between the corresponding groove and the pole switching groove is set to a non-integral multiple of the width of the pole switching groove. A commutator for a motor, characterized in that the width is larger than the width of a concave groove.