JPH0342519U

JPH0342519U -

Info

Publication number: JPH0342519U
Application number: JP10369589U
Authority: JP
Priority date: 1989-09-04
Filing date: 1989-09-04
Publication date: 1991-04-22

Description

[Brief explanation of drawings]

第１図は本考案の第１実施例の構成図、第２図
は本考案の第２実施例の構成図、第３図は歯車式
磁気回転センサの原理図、第４図は従来の磁気回
転センサの構成図、第５図は磁気検出素子を横切
る磁束の特性図、第６図および第７図は磁気検出
素子の出力特性例を示す説明図、第８図は従来の
磁気回転センサの等価回路図、第９図はＭＲ素子
の周辺回路の構成図である。図中、Ａ，Ｂは外輪、Ｃは内輪、Ｍは永久磁石
、Ｅは磁気検出素子、Ｇ１，Ｇ２はギヤツプ、Ａ
３，Ｂ３は突出部、Ａ４，Ｂ４はスリツトである
。 Fig. 1 is a block diagram of the first embodiment of the present invention, Fig. 2 is a block diagram of the second embodiment of the present invention, Fig. 3 is a principle diagram of a gear type magnetic rotation sensor, and Fig. 4 is a diagram of the conventional magnetic rotation sensor. A configuration diagram of a rotation sensor, Fig. 5 is a characteristic diagram of magnetic flux crossing a magnetic detection element, Figs. 6 and 7 are explanatory diagrams showing examples of output characteristics of a magnetic detection element, and Fig. 8 is a diagram of a conventional magnetic rotation sensor. The equivalent circuit diagram, FIG. 9, is a configuration diagram of the peripheral circuit of the MR element. In the figure, A and B are outer rings, C is inner rings, M is a permanent magnet, E is a magnetic detection element, G1 and G2 are gaps, and A
3 and B3 are protrusions, and A4 and B4 are slits.

Claims

[Scope of Claim for Utility Model Registration] 1. A cylindrical permanent magnet M magnetized in the axial direction, and an inner ring C having teeth formed on the circumferential surface of a disc-shaped member and fixed to one surface of the permanent magnet M. Rotor RT
and a first outer ring A having teeth formed on the inner surface of the semi-cylindrical member and disposed in a non-contact manner facing the circumferential surface of the inner ring C, and symmetrically with the first outer ring A. a second outer ring B that is formed to face the opposite circumferential surface of the inner ring C, is shifted by 1/2 pitch from the first outer ring A, and is disposed in a non-contact manner; and the first and second outer rings. A stator ST is constituted by a magnetic detection element E disposed on one side of gaps G1 and G2 between A and B, and the ends of the first and second outer rings A and B facing the magnetic detection element E Projections A3 and B3 in the center, respectively
A magnetic rotation sensor characterized by forming: 2 A rotor RT is formed by a cylindrical permanent magnet M magnetized in the axial direction and an inner ring C having teeth formed on the circumferential surface of a disc-shaped member and fixed to one surface of the permanent magnet M.
and a first outer ring A having teeth formed on the inner surface of the semi-cylindrical member and disposed in a non-contact manner facing the circumferential surface of the inner ring C, and symmetrically with the first outer ring A. a second outer ring B that is formed to face the opposite circumferential surface of the inner ring C, is shifted by 1/2 pitch from the first outer ring A, and is disposed in a non-contact manner; and the first and second outer rings. A stator ST is constituted by a magnetic detection element E disposed on one of the gaps G1 and G2 between A and B, and a slit extending in the circumferential direction is provided at the center of the first and second outer rings A and B. A magnetic rotation sensor characterized by forming A4 and B4.