SU1173209A1 - Magneto-elastic transducer of force - Google Patents

Abstract

MAGNETIC ELASTIC SENSOR OF EFFORT containing multielement ser-; A sensor magnetizing and perpendicular measuring windings located at an angle of 45 to the direction of the measured force, the magnetizing windings being connected according to, and the measuring windings consistently and according to, characterized in that, in order to improve the accuracy by linearizing the output characteristic, the magnetizing and The measuring windings placed in parallel planes are located in each first element of the core, and in each second element there are additional I windings whose planes x are parallel to the measuring planes of about (L coil, with additional windings connected in series and in accordance with the measuring.

Description

one

. The invention relates to force-measuring equipment and can be applied in weighing devices and in devices for measuring rolling forces.

A magnetoelastic force sensor is known, which contains a magnetic core with a measuring winding connected to it, and a magnetizing winding connected to the power supply circuit, as well as to improve the accuracy of measurement by improving the linearity of the output characteristics and the correction unit, made in the form in contact with the main additional magnetic circuit with the windings and connected in series to the additional winding circuit, and the latter is located on the main magnetic circuit gadfly. In this case, the secondary winding of the correction unit is connected parallel to the primary winding of the main magnetic circuit in the power supply circuit lj.

However, this sensor is characterized, firstly, by increased power consumption, which is necessary to power the primary winding of the correction unit, and secondly, by reduced static stability, since with a constant cross section, the sensor height increases due to the correction unit, which is an additional magnetic circuit, in contact with the main plane, perpendicular to the direction of application of the load, And this, in turn, limits the upper limit of the measured forces. In addition, the linearization method implemented in the sensor reduces sensitivity.

The closest in technical essence to the present invention is a multi-element magnetoelastic sensor containing a multi-element core, assembled from electrical steel sheets. In each element of the core there is a chain of holes in which mutually perpendicularly magnetizing and measuring windings are stacked, and the winding plates have an angle of 45 to the direction of action of the measured vortex 2.

However, this device is characterized by relatively low accuracy due to the nonlinearity of the output

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specifications. There is a need to complicate the design of the measuring device, since it is necessary to introduce an electric-line linearization unit. In addition, high-force sensors are characterized by a large L of power consumption, which is explained by the operation of the core of this sensor in magnetic saturation mode.

0 to reduce output variation. Thus, for example, to measure forces in the order of 4–5 thousand tons at a supply voltage frequency of 50 Hz, a 5 kW source is required.

5 The aim of the invention is to reduce power consumption, to increase measurement accuracy (while at the same time simplifying the design) by linearizing the output characteristic and increasing the sensitivity of the sensor.

The goal is achieved by the fact that in a magnetoelastic force sensor containing multiple elements

5 the core, the magnetizing and perpendicular measuring windings for them, located at an angle of 45 to the direction of the measured force, the magnetizing windings being connected according, and the measuring windings sequentially and according to, magnetizing and placed in parallel planes, measuring windings located in each ground an element of the serc of the sensor, and in every second element there are additional windings, the planes of which are parallel to the planes of the measuring windings, while the additional windings are included

IQ consistently, and according to the measurement.

The magnetizing current generated in the magnetizing winding by the alternating current source causes a magnetic flux in the core of the sensor. In this case, the connection circuit of the magnetization windings of individual elements among themselves is such that there is a flow of self-induction coupled only with the magnetizing winding in each odd (even) element, the main flow of mutual induction coupled with the magnetizing and measuring windings in each odd

5 (even) element, and mutual induction flow, covering all windings of the core and passing through all its elements.

3

FIG. 1 shows schematically the claimed magnetoelastic force sensor; FIG. 2 - curves of output signals taken only from the measuring signal, only from the additional windings and from both windings connected in series, on the magnitude of the measured force.

The magnetoelastic force sensor (Fig. 1) consists of a three-element core 1, the extreme (odd) elements of which contain magnetizing 2 and 3 and measuring 4 and 5 windings whose planes are mutually perpendicular and oriented at an angle of 45 to the direction of the measured force, and also from the additional winding 6, which is located in the middle (even) core element, mainly in a plane parallel to the planes of the measuring windings 4 and 5

When the magnetizing sensor winding is connected to the AC source and when measuring and additional windings are open, magnetic flux appears in the magnetic circuit, partially coupled only with the magnetizing winding (self-induction flow), partly with the magnetizing winding and measuring (primary mutual induction flow) and

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coupled with all sensor windings.

Under the action of the measured force on the frontal part of the surface of the core of the magnetic core, magnetic flux deformation occurs. The flux linkages of the measuring and auxiliary windings are changed in such a way that their output characteristics are inverse to each other.

The sum signal taken from the measuring and additional windings connected in series is a linear function of the measured force.

FIG. 2 curve 1 represents the dependence of the signal taken from the measuring winding of the sensor on the measured force, curve 2 the dependence of the signal removed by the additional sensor winding on the measured force, curve 3 the dependence of the signal taken from the measuring and additional windings power on.

The claimed magnetoelastic data on the comparison with the prototype ensures the reduction of the consumed

power by 30-50% and increase the accuracy of the characteristics and absolute sensitivity of approximately doubled.

Claims (1)

MAGNETOELASTIC EFFICIENT SENSOR, containing a multi-element core, magnetizing and perpendi- / measuring windings located at an angle of 45 ° to the direction of the measured force, the magnetizing windings being connected in accordance and the measuring ones sequentially and in accordance, characterized in that, in order to increase the accuracy by linearizing the output characteristic, the magnetizing and placed in parallel planes windings are located in each first element of the core, and in each second element additional windings are located, the planes of which are parallel to the planes of the measuring coil, with additional windings connected in series and in accordance with the measuring. from SU ...> 1173209 eleven