JPS6434881U

JPS6434881U -

Info

Publication number: JPS6434881U
Application number: JP12774487U
Authority: JP
Priority date: 1987-08-21
Filing date: 1987-08-21
Publication date: 1989-03-03

Description

[Brief explanation of the drawing]

第１図は本考案の第１の実施例におけるインデ
ツクスの斜視図、第２図は同インデツクスの断面
図、第３図は同インデツクスを取付けたステツピ
ングモータの要部の断面図、第４図は本考案の第
２の実施例におけるインデツクスの断面図、第５
図は同インデツクスの下面図、第６図は同インデ
ツクスを取付けるロータコアの要部平面図、第７
図は同インデツクスを取付けたステツピングモー
タの要部の断面図、第８図はインデツクスマグネ
ツトのロータコアからの距離とリツプル電圧との
関係を示すグラフ、第９図は従来のインデツクス
を装着したステツピングモータの要部を破断した
側面図、第１０図は同ステツピングモータのロー
タコアの断面図、第１１図及び第１２図はインデ
ツクスとロータの歯との位置関係を説明する平面
図および要部拡大図、第１３図Ｘ，Ｙはロータコ
アの歯の位置とインデツクス信号のタイミングを
示すグラフ、第１４図は従来のインデツクスにお
けるモータメイン磁界への影響を示すグラフであ
る。２ａ……回転軸、４，１８……ロータコア、９
，１４……インデツクス本体、１０，１５……位
置決めピン、１２……貫通孔、１１，１７……イ
ンデツクスマグネツト、１６……位置決め突起、
２０……クランプ用凹部、α……位置決めピンと
インデツクスマグネツトとの距離（０．３mm）。 Fig. 1 is a perspective view of the index according to the first embodiment of the present invention, Fig. 2 is a sectional view of the index, Fig. 3 is a sectional view of the main parts of a stepping motor to which the index is attached, and Fig. 4. is a sectional view of the index in the second embodiment of the present invention;
The figure is a bottom view of the index, Figure 6 is a plan view of the main part of the rotor core to which the index is attached, and Figure 7 is a bottom view of the index.
The figure is a cross-sectional view of the main parts of a stepping motor equipped with the same index, Figure 8 is a graph showing the relationship between the distance of the index magnet from the rotor core and ripple voltage, and Figure 9 is a diagram showing the relationship between the ripple voltage and the distance of the index magnet from the rotor core. FIG. 10 is a cross-sectional view of the rotor core of the stepping motor, and FIGS. 11 and 12 are plan views and main points illustrating the positional relationship between the index and the teeth of the rotor. FIG. 13, an enlarged view, is a graph showing the position of the teeth of the rotor core and the timing of the index signal, and FIG. 14 is a graph showing the influence of the conventional index on the motor main magnetic field. 2a... Rotating shaft, 4, 18... Rotor core, 9
, 14... Index body, 10, 15... Positioning pin, 12... Through hole, 11, 17... Index magnet, 16... Positioning projection,
20... Clamp recess, α... Distance between positioning pin and index magnet (0.3 mm).

Claims

[Claims for Utility Model Registration] (1) A rotor core having a rotating shaft, a positioning pin that fits into a mounting hole provided in the rotor core, and a positioning pin that is disposed on the positioning pin and formed through the rotor core. An index for a stepping motor, comprising an index magnet magnetized in a direction perpendicular to the driving magnetic flux, and the index magnet is separated from the end face of the rotor core by 0.3 mm or more in the direction of the rotation axis. (2) The stepping motor index according to claim 1, which is a utility model, in which the positioning pins are made of resin and the index magnet is integrally molded with resin.