JPS6175151U

JPS6175151U -

Info

Publication number: JPS6175151U
Application number: JP1984159207U
Authority: JP
Priority date: 1984-10-23
Filing date: 1984-10-23
Publication date: 1986-05-21
Also published as: JPH0241869Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の断面図、第２図は
第１図中の第２の磁石回転体の正面図、第３図は
磁気抵抗効果の説明図、第４図ａは従来構造の断
面図、ｂは第１の磁石回転体の正面図、ｃは第２
の磁石回転体の正面図、第５図ａは磁気抵抗セン
サと磁石回転体との配置関係図、ｂ及びｃは出力
信号波形図、ｄ及びｅは各磁気抵抗センサの電気
回路図である。符号の説明、１……被検回転体、１−１……取
付板、１−２……回転軸、２−１……第１の磁気
抵抗センサ、２−２……第２の磁気抵抗センサ、
３……空隙、４−１……第１の磁石回転体、４−
２……第２の磁石回転体、４−３……スペーサ、
５……ブツシング、６……締結ねじ、７……ねじ
孔。 Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a front view of the second magnet rotating body in Fig. 1, Fig. 3 is an explanatory diagram of the magnetoresistive effect, and Fig. 4 a is a conventional A sectional view of the structure, b is a front view of the first magnet rotating body, c is a second
FIG. 5a is a diagram of the arrangement relationship between the magnetoresistive sensor and the magnetoresistive member, FIG. 5b and c are output signal waveform diagrams, and d and e are electrical circuit diagrams of each magnetoresistive sensor. Explanation of symbols, 1...Rotating body to be tested, 1-1...Mounting plate, 1-2...Rotating shaft, 2-1...First magnetic resistance sensor, 2-2...Second magnetic resistance sensor,
3... Air gap, 4-1... First magnet rotating body, 4-
2... Second magnet rotating body, 4-3... Spacer,
5...butsuing, 6...fastening screw, 7...screw hole.

Claims

[Scope of utility model registration request]

A magnetoresistive sensor consisting of a plurality of magnetoresistive elements whose electrical resistance changes depending on the strength of the magnetic field is arranged at a constant pitch, and a circle with a large number of N poles and S poles alternately magnetized at the same pitch on the outer periphery. A voltage signal is output in accordance with the rotational movement of the rotating body to be tested, which is installed opposite to the plate-shaped rotating magnetic body, and the rotating magnetic body is integrally attached.
Further, on the outer periphery of the disk-shaped second rotating magnet body that rotates integrally with the rotating magnet body, one N pole and one S pole are formed at the same pitch as the magnetizing pitch of the first rotating magnet body.
Only the pole pair is magnetized and the output of a second magnetoresistive sensor placed opposite to this second magnet rotating body is waveform-shaped to produce an origin pulse signal that has a constant phase relationship with the output of the first magnetoresistive sensor. In the magnetic encoder configured as follows, the first and second magnet rotating bodies are fixedly held on the outer periphery of a bushing with a spacer sandwiched between them in the axial direction, and the bushing is axially outward from the outermost end surface of the magnet rotating body. The axial length of the bushing is determined so that it does not protrude into the bushing. A magnetic encoder, characterized in that the encoder is fastened to the rotating shaft of a rotating body to be tested.