JPS63160079U

JPS63160079U -

Info

Publication number: JPS63160079U
Application number: JP5306087U
Authority: JP
Priority date: 1987-04-07
Filing date: 1987-04-07
Publication date: 1988-10-19

Description

[Brief explanation of the drawing]

第１図は本考案の第一実施例としての位置検知
素子を備えた軸方向に厚みの薄いＰＭ形ステツピ
ングモータの縦断面図、第２図は同ステツピンギ
モータの構造を示す一部切欠分解斜視図、第３図
は位置検知素子とマグネツトロータに形成した磁
気エンコーダ磁極との関係を示す斜視図、第４図
は本考案第２実施例を示すマグネツトロータの縦
断面図、第５図は本考案の第３実施例を示す位置
検知素子を備えた軸方向に厚みの薄いＰＭ形ステ
ツピングモータの縦断面図、第６図は本考案の第
４実施例を示す位置検知素子を備えた軸方向に厚
みの薄いＰＭ形ステツピングモータの縦断面図、
第７図は同ＰＭ形ステツピングモータのマグネツ
トロータの下面斜視図、第８図は本考案第５実施
例を示すマグネツトロータの縦断面図、第９図は
本考案第６実施例を示すマグネツトロータの斜視
図、第１０図は本考案の第７実施例を示すマグネ
ツトロータの斜視図である。１，１′，１″…軸方向に厚みの薄いＰＭ形ス
テツピングモータ、２…回転軸、３，３′…ＰＭ
形ステツピングモータ用駆動用磁極、４，４′，
４″…磁気エンコーダ磁極、５，５′，５″…カ
ツプ型マグネツトロータ、６，７…微小空隙、８
，９…ステータ電機子、１０…モータハウジング
構成部材、１１…軸受、１２…モータハウジング
構成部材、１３…ＰＭ形ステツピングモータ用ハ
ウジング、１４…磁気センサ支持部材、１５…リ
ード線、１６…リング状磁性体、１７…磁気抵抗
効果素子、１８ａ，１８ｂ…ステータ磁極片、１
９…コイルボビン、２０ａ，２０ｂ…ステータ磁
極片、２１…コイルボビン、２２，２３…リード
線、２４…内側中空部。 Fig. 1 is a longitudinal sectional view of a PM type stepping motor with a thin axial thickness and equipped with a position sensing element as a first embodiment of the present invention, and Fig. 2 is a partially cutaway view showing the structure of the same stepping motor. FIG. 3 is an exploded perspective view, FIG. 3 is a perspective view showing the relationship between the position sensing element and the magnetic encoder magnetic poles formed on the magnet rotor, and FIG. Figure 5 is a vertical cross-sectional view of a PM type stepping motor with a thin axial thickness and equipped with a position sensing element according to a third embodiment of the present invention, and Figure 6 is a position sensing element showing a fourth embodiment of the present invention. A longitudinal cross-sectional view of a PM type stepping motor with a thin axial thickness,
Fig. 7 is a bottom perspective view of the magnet rotor of the PM type stepping motor, Fig. 8 is a vertical sectional view of the magnet rotor showing the fifth embodiment of the invention, and Fig. 9 shows the sixth embodiment of the invention. FIG. 10 is a perspective view of a magnet rotor showing a seventh embodiment of the present invention. 1, 1', 1''... PM type stepping motor with thin thickness in the axial direction, 2... Rotating shaft, 3, 3'... PM
Magnetic poles for driving stepping motors, 4, 4',
4"...Magnetic encoder magnetic pole, 5, 5', 5"...Cup type magnet rotor, 6, 7...Minute gap, 8
, 9... Stator armature, 10... Motor housing component, 11... Bearing, 12... Motor housing component, 13... Housing for PM type stepping motor, 14... Magnetic sensor support member, 15... Lead wire, 16... Ring magnetic body, 17... magnetoresistive element, 18a, 18b... stator pole piece, 1
9... Coil bobbin, 20a, 20b... Stator pole piece, 21... Coil bobbin, 22, 23... Lead wire, 24... Inner hollow part.

Claims

[Scope of claims for utility model registration] (1) N and S on both the inner and outer circumferences of the magnetic rotor.
A driving magnetic pole for a stepping motor is formed by radially magnetizing the magnetic poles of 2P (P is an integer) with a fine pitch, and a driving magnetic pole for a stepping motor is formed on both the inner and outer periphery of the magnet rotor through a minute gap with the driving magnetic pole. A stator armature is provided, at least one axial end of the magnet rotor is formed to protrude from an axial end of the stator armature, and the protruding side surface of the magnet rotor is substantially N. , S magnetic poles are formed into 2P pieces and used as magnetic encoder magnetic poles, and a magnetic sensor for the magnetic encoder is disposed opposite to the magnetic encoder magnetic poles via a gap, and the thickness is thin in the axial direction. PM type stepping motor. (2) The above-mentioned magnetic encoder magnetic poles utilize drive magnetic poles that have been magnetized and formed on the magnetic rotor as they are, according to Utility Model Registration Claim No. (1)
A PM type stepping motor having a thin thickness in the axial direction and equipped with the position sensing element described in Section 1. (3) The portion of the magnet rotor used as the magnetic encoder magnetic pole is formed by magnetizing substantially 2P N and S magnetic poles at a finer pitch than the drive magnetic pole to form the magnetic encoder magnetic pole; A PM type stepping motor having a thin thickness in the axial direction and having a position detecting element according to claim (1) of the registered utility model. (4) The above-mentioned magnetic encoder magnetic poles are formed by forming unevenness on the magnet rotor and magnetizing N poles or S poles on the uneven parts, thereby effectively converting the N and S magnetic poles into 2P.
Forming individually magnetized magnetic encoder magnetic poles,
A PM type stepping motor having a thin thickness in the axial direction and having a position detecting element according to claim (1) of the registered utility model.