JPH0397665U

JPH0397665U -

Info

Publication number: JPH0397665U
Application number: JP614890U
Authority: JP
Priority date: 1990-01-29
Filing date: 1990-01-29
Publication date: 1991-10-08

Description

[Brief explanation of the drawing]

第１図は本考案に係る回転数検出器の要部構成
例を示す図、第２図は疑似ホール素子とホール素
子の出力信号のタイムチヤート、第３図は疑似ホ
ール素子の動作・配列を示す図、第４図は本考案
に係るリング磁石周辺の構成斜視図、第５図は本
考案に係る磁気バブルチツプの外観図、第６図は
第１図回路部のタイムチヤート、第７図はリング
磁石と読出しコイルによる磁界のベクトル軌跡を
示す図、第８図〜第１２図は従来例を説明するた
めの図である。１…磁気バブル素子、３，４…読出しコイル、
５…リング磁石、２１，２２…疑似ホール素子、
２３…角度演算器、２７…象限判別器、２８，２
９…ホール素子、３０…Ｘ軸用ＲＯＭ、３１…Ｙ
軸用ＲＯＭ。 Fig. 1 is a diagram showing an example of the main part configuration of the rotation speed detector according to the present invention, Fig. 2 is a time chart of a pseudo Hall element and the output signal of the Hall element, and Fig. 3 is a diagram showing the operation and arrangement of the pseudo Hall element. 4 is a perspective view of the structure around the ring magnet according to the present invention, FIG. 5 is an external view of the magnetic bubble chip according to the present invention, FIG. 6 is a time chart of the circuit section of FIG. 1, and FIG. FIGS. 8 to 12, which are diagrams showing vector trajectories of magnetic fields caused by a ring magnet and a readout coil, are diagrams for explaining a conventional example. 1... Magnetic bubble element, 3, 4... Readout coil,
5... Ring magnet, 21, 22... Pseudo Hall element,
23... Angle calculator, 27... Quadrant discriminator, 28, 2
9...Hall element, 30...X-axis ROM, 31...Y
ROM for shaft.

Claims

[Claims for Utility Model Registration] A magnetic field from a permanent magnet 5 attached to a rotating shaft is applied to a magnetic valve element 1 to move a magnetic valve consisting of a plurality of bit patterns, and an alternating current is passed through a readout coil to generate a rotating magnetic field. In an apparatus for measuring the cumulative number of rotations of a rotating shaft by generating a magnetic valve, forcibly moving the magnetic valve, and detecting a bit pattern of the magnetic valve with a magnetic valve detection element, the apparatus is provided on the same wafer as the magnetic valve element. θ
Or an angle calculator that outputs (θ+180°) and (
θ is the angle between the magnetic field of the permanent magnet and the current direction of the pseudo Hall effect element), based on two Hall elements that measure the X-axis component and Y-axis component of the magnetic field of the permanent magnet, respectively, and the output of the two Hall elements. and a quadrant discriminator that selects either the output value θ or (θ+180°) of the angle calculator, and a quadrant discriminator that selects either the output value θ or (θ+180°) of the angle calculator, and a quadrant discriminator that selects either the output value θ or (θ+180°) of the angle calculator, and a a first memory means in which a signal is written; a second memory means in which a signal corresponding to the strength of the Y-axis component magnetic field applied by the permanent magnet to the magnetic bubble element is written at an address corresponding to the angle θ; circuit means for superimposing a direct current on the direct current to cancel the magnetic field applied to the magnetic bubble element by the permanent magnet and flowing it through the readout coil based on the signals introduced from the first and second storage means; number detector.