CN87211278U

CN87211278U - Small value force magneto elastic sensor

Info

Publication number: CN87211278U
Application number: CN 87211278
Authority: CN
Inventors: 史硕东; 周贤; 谢昭华
Original assignee: Shanghai Inst Of Industrial Automation Meter State Machine-Building Industry C
Current assignee: Shanghai Inst Of Industrial Automation Meter State Machine-Building Industry C
Priority date: 1987-10-14
Filing date: 1987-10-14
Publication date: 1988-06-08

Abstract

The utility model discloses a small value force magneto elastic sensor, which is characterized in that the sensor is composed of a magnetic conductor (1) which is glued and folded by a middle cross shape and circular silicon steel sheets of four arms, and four coils on four arms; the four coils form a differential bridge circuit. Because the upright arm is in compression, and the horizontal arm is in tension; the output differential signals eliminate or decrease the non-linear error and the errors caused by other factors such as temperature, etc. Therefore, the small value force magneto elastic sensor has self-compensating ability and high measuring accuracy; the small value force magneto elastic sensor can be widely used for measuring the force values (or weights) of various industrial departments.

Description

Small value force magneto elastic sensor

The utility model is a kind ofly to measure one's own ability or weight causes that material magnetic conduction change of properties carries out measured sensor by tested, can be widely used in the measurement of each industrial sector power and weight.

At present, small value force is measured structure that the general magnetoelastic sensor that adopts mostly is matrix pattern as shown in Figure 1, is wound with coil respectively and constitutes an alternating current bridge on four arms that sensor intersects vertically, and an end of electric bridge adds certain voltage, and the other end is the output of bridge circuit.Sensor does not have external force and does the time spent, bridge balance, and no signal output is subjected to external force and does the time spent on the sensor upright arm, make the electric bridge out of trim, output voltage signal, this signal is directly proportional with adding external force (or weight).Owing to adopt this version, according to mechanics principle, when vertical two arms are under pressure, be subjected to the pulling force effect hardly with two horizontal arms that intersect, therefore, even adopt differential bridge circuit, can not eliminate or reduce the error that factors such as nonlinearity erron and made flow-route and temperature cause, sensor accuracy is improved meet difficulty.

The purpose of this utility model does not have self-compensating shortcoming for the magnetoelastic sensor that overcomes the matrix pattern structure, designs a kind of self compensation ability that structurally has, and can eliminate or reduce the error that nonlinearity erron and material, temperature etc. cause.

For this purpose, the magnetic conductor of small value force magnetoelastic sensor is to be that the garden ring siliconized plate bonding of cruciform four arms builds up by the centre, is wound with 4 groups of coils on four arms, is connected into differential bridge circuit.Like this, when on upright arm, being under pressure, be subjected to pulling force on the horizontal arm, according to the ferromagnetics theory, the vertical direction magnetoconductivity descends, two bridge arm voltages that corresponding coil is formed reduce, and the horizontal direction magnetoconductivity increases, and voltage increases on corresponding two brachium pontis, both change on the contrary, in output place stack, make both obtain differential compensation by nonlinear properties, and eliminate or reduce the error that material, temperature variation cause.

The utility model embodiment is described in conjunction with the accompanying drawings.

Accompanying drawing 1 is a matrix pattern magnetoelastic sensor structure principle chart;

Accompanying drawing 2 is the utility model small value force magnetoelastic sensor profile synoptic diagram;

Accompanying drawing 3 is the utility model small value force magnetoelastic sensor structure principle chart;

Accompanying drawing 4 is the differential bridge circuit figure of the utility model small value force magnetoelastic sensor.

As shown in Figure 2, the small value force magnetoelastic sensor is that the garden ring siliconized plate of cross four arms forms magnetic conductor 1 with the glue bonding by the centre, and its sheet is several according to the decision of power value size.Cruciform four

arms

2,4,6,8 put insulation pad 10 respectively as shown in Figure 3, and then correspondingly

coil

3,5,7,9, the head and coil 5 ends of coil 3 are joined, the head of coil 5 and the end of coil 7 join, the head of coil 7 and the end of coil 9 join, the head of coil 9 and the end of the coil 3 formation differential bridge circuit as shown in Figure 4 that joins, bridge circuit one end is given excitation voltage 12.When having external force P, magnetic conductor 1 do not do the time spent, each winding coil 3 on cruciform four arms in the middle of the output characteristics of sensor depends on, 5,7,9 initial magnetic characteristic and electrical parameter values, corresponding coil impedance Z 1 * Z3=Z2 * Z4, output terminal 11 signals of electric bridge are zero, P does the time spent as external force, according to mechanics principle, 2 of magnetic conductor 1,6 upright arms are under pressure, 4, be subjected to pulling force on 8 horizontal arms, add in output terminal choosing with pressure direction respective coil 3 and 7 output electric signal with direction of pull respective coil 5 and 9 output electric signal, make both obtain differential compensation by nonlinear signal, eliminate or reduced non-linear composition in the signal, in addition, in the working sensor process, because temperature and other factors cause that the magnetic material parameter changes the sensor error that causes and also reduced.

The utility model has the advantages that the error that elimination or the factors such as nonlinear error reduction and temperature cause, improved the precision of sensor, bring up to 0.3% through evidence precision in identical power value scope from original 0.5%, can be widely used in the measurement of each industrial department power value (or weight).

Claims

1, a kind of small value force magnetoelastic sensor that is made of coil and siliconized plate is characterized in that:

A. sensor by the centre be the magnetic conductor 1 that builds up of the garden ring-shaped silicon steel sheet bonding of cruciform 2,4,6,8 four arms and on 2,4,6,8 four arms coil 3,5,7,9 form,

B. coil 3,5,7,9 is formed differential bridge circuit.