CN2241345Y

CN2241345Y - Magnetosensor

Info

Publication number: CN2241345Y
Application number: CN 95216928
Authority: CN
Inventors: 陈立民
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-06
Filing date: 1995-07-06
Publication date: 1996-11-27
Anticipated expiration: 2005-07-06

Abstract

The utility model discloses a magnetic sensor. The interior of a non-magnetism shell body is sealed with a permanent magnet and a sensing element. The sensing element is an induction coil at least which is in spiral winding. The sensing element is fixed on the polar plane of any polar of the permanent magnet of the interior of the shell body and is abutted with the inner wall of the shell body. The shaft line of the coil is perpendicular to the polar plane, and is connected with a lead wire pin which is positioned on the vicinity of the other magnetic polar of the permanent magnet. Compared with the publicly known technique, the utility model has the advantages of novel structure, stable performance, high sensitivity, lower requirement of the manufacture technology, no additional drive voltage, small temperature drift, etc. The utility model is used for the high-precision detection and the magnetic imaging scan of the magnetic object.

Description

Magneto-dependent sensor

The utility model relates to the sensor that magnetic is sensed as feature.

Having not as detection, magnetic exists, the magneto-dependent sensor of the strong and weak and detection magnetic bodies movement velocity of detection magnetic bodies, in known technology all with the semiconductor Hall element as sensing element, Hall element not only manufacture craft is had relatively high expectations, and need add the driving voltage of parameter stability when using, even after having satisfied voltage request, also still exist the peculiar temperature drift phenomenon of Hall element, influence accuracy of detection, in high-acruracy survey, eliminate this temperature and float phenomenon, have suitable difficulty.

The purpose of this utility model is to overcome the defective of prior art and provides a kind of manufacture craft requirement relatively low, need not add driving voltage, and the minimum magneto-dependent sensor of temperature drift.

The purpose of this utility model realizes by following scheme: be packaged with permanent magnet and sensing element in non magnetic housing, described sensing element is at least one inductive coil that coils twist, this coil is fixed on the polar plane of the arbitrary magnetic pole of permanent magnet in the housing and near inner walls, coil axis and polar plane are perpendicular, and by the lead-in wire be positioned at another magnetic pole of permanent magnet near terminal pin link to each other.In the time of near magnetic bodies passes through this inductive coil, the variation of magnetic flux makes coil produce induction electromotive force, and the output electric signal reaches testing goal.

This magneto-dependent sensor is compared with known technology, overcome the defective of prior art, be a kind of novel structure, stable performance, highly sensitive sensor, its manufacture craft requires relatively low, do not need to add driving voltage in addition, temperature drift is minimum, can be used for the scanning of the high Precision Detection of magnetic bodies and magnetic imaging.

Fig. 1 is the utility model structural representation (non magnetic housing encapsulates situation with transparent plastic).

Fig. 2 is the vertical view of Fig. 1.

Be further elaborated again in conjunction with above-mentioned accompanying drawing embodiment.

Magneto-dependent sensor (referring to Fig. 1-2) adopts and to be packaged with permanent magnet (3) in the housing (1) of nonmagnetic substance system and as the inductive coil (2) of sensing element, this inductive coil coils twist and is fixed on the polar plane of the arbitrary magnetic pole of permanent magnet in the housing and near inner walls, coil axis and polar plane are perpendicular, and link to each other by near lead-in wire (4) terminal pin (5) with being positioned at another magnetic pole of permanent magnet.Nonmagnetic substance comprises metal material and nonmetallic materials.

Inductive coil is made by metallic conductor, at least one, perhaps two reach 100 more than even, coil number the more difficulty of processing is bigger, but resolution is higher, particularly scans as magnetic imaging, must have abundant coil unit,, be advisable with two if as general sensor.It is independent mutually that the arrangement of inductive coil is in-line, adjacent near and do not link to each other, have separately lead-in wire and terminal pin.

Must not surpass 3 millimeters for thickness, otherwise influence sensitivity near that a part of non magnetic housing of inductive coil.Inner walls and inductive coil can be close to or apart several millimeters.

Claims

1. magneto-dependent sensor, in non magnetic housing (1), be packaged with permanent magnet (3) and sensing element, it is characterized in that described sensing element is at least one inductive coil that coils twist (2), on the polar plane of this coil stationary arbitrary magnetic pole of permanent magnet in housing and near inner walls, coil axis and polar plane are perpendicular, and link to each other by near lead-in wire (4) terminal pin (5) with being positioned at another magnetic pole of permanent magnet.

2. magneto-dependent sensor as claimed in claim 1, the arrangement that it is characterized in that described inductive coil (2) are independent mutually, adjacent near and do not link to each other, have separately lead-in wire (4) and terminal pin (5).

3. magneto-dependent sensor as claimed in claim 1 or 2, it is characterized in that must not be above 3 millimeters near the thickness of that a part of non magnetic housing (1) of inductive coil (2).