SU1281876A1 - Differential transformer angle transducer - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to increase the accuracy of measuring the angle of rotation by increasing the sensitivity by increasing the magnetic permeability gradient of the measuring circuit of the transformer angle sensor. Sensor Contains a ferromagnetic stator 1, made in the form of a hollow cylinder with a torp, new covers 2 and 3. In the annular grooves of the covers there are excitation windings 4 and 5 and 6 and 7 measurements. A ferromagnetic cylindrical rotor 8 associated with the object of control is placed in the cavity of the stator. On the inner surfaces of the stator covers there is one pair of shielding plates 9 and 10 symmetrical about the transverse axis of the sensor, and on both rotor bases a second pair of shielding plates 11 and 12 placed diametrically opposite to the longitudinal axis of the sensor. Both pairs of plates are made of non-magnetic material with high electrical conductivity. When the rotor is rotated, the area of overlap of the magnetic flux by the shielding plates changes, as a result of which the EMF in one of the measuring windings increases, and the EMF in the other measuring winding decreases, As a result, when the rotor turns 90 º the sensor output varies from maximum to zero. 1 or t with a (L

Description

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The invention relates to a measurement technique and can be applied to measure the angle of rotation in various control systems, for example, for telemetry measurements of the angle of rotation of the balance weight of the oil, mine, its pumping unit.

The aim of the invention is to improve the accuracy of measuring the angle of rotation by increasing the sensitivity of the sensor by increasing the gradient of the magnetic conductivity of the measuring circuit of the sensor.

The drawing shows the transformer sensor of the angle of rotation of the object, the cross section along the transverse axis,

The sensor contains a ferromagnetic stator 1, made in the form of a hollow cylinder with end caps 2 and 3. In the annular grooves of caps 2 and 3 of stator 1 excitation windings 4 and 5 connected in series according to, and measurement windings 6 and 7 connected in series opposite are placed, B The cavity of the stator 1 houses a cylindrical ferromagnetic rotor 8, which is associated with the test object during the measurement. On the inner surfaces of the zigzags 2 and 3 of the stator 1 there is one pair of plates 9 and 10 symmetrically located relative to the transverse axis of the sensor, and on both bases of the rotor 8 they are diametrically opposite to the longitudinal axis of the sensor of the second pair of plates 11 and 12. Both pairs of plates are made semicircular of non-magnetic material with high electrical conductivity.

Transformer angle sensor works as follows,

In the initial position of the rotor 8, the magnetic flux created by the excitation winding 4 is weakened by shielding plates 10 (on the stator 2) and 11 (on one of the rotor bases) completely crossing the magnetic flux path. As a consequence, the EMF induced in the measuring winding 7 is minimal. In the same initial position, the magnetic flux generated by the excitation winding 5 is only partially weakened by the positioning of the shielding plates 9 (on the other base of the rotor 8) and 12 (on the stator arch 3). As a consequence, the SDS, induced in the measuring winding 6, maximum,

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As a result, the sensor output signal has a maximum amplitude. When the rotor 8 is rotated, the overlap area of the magnetic excitation flux by the shielding plates 9 and 12 increases, and the overlap area of the excitation magnetic flux by the shielding plates 10 and 11 decreases. Because of this, emf ,. induced in the measuring winding 7, increases, and the emf induced in measuring winding 6 decreases, as a result, the decoder sensor signal decreases. When the rotor is rotated 90 degrees, the overlap of the magnetic flux by the shielding plates is equal for both measuring windings 6 and 7, as a result of which the output signal of the sensor is zero.

Since the shielding plates are made of a material with high electrical conductivity, a change in their relative position leads to

an increase in the magnetic conductivity gradient of the measuring circuit of the sensor, which increases its sensitivity. By placing the field windings and measurements in

the annular grooves of the end krsh str of the stator almost the entire magnetic flux, created by the excitation windings, crosses the measuring windings, which further increases the sensitivity of the transformer

angle sensor. To increase the linearity of the output characteristics of the sensor, the rotor and sensor caps can be made of pressed powder steel.

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Claims (1)

Invention Formula A transformer angle sensor containing a ferromagnetic cylindrical rotor, a ferromagnetic stator made in the form of a hollow cylinder with end caps, and excitation and measurement windings placed on it, characterized in that, in order to improve the accuracy of measurement by increasing sensitivity, it is equipped with two pairs of plates , made of non-magnetic material with high electrical conductivity, one of the pairs is placed on the internal surfaces of the stator's strut symmetrically relative to the transverse axis of the datesJ1281876 The second, on the basis of the rotor, the windings of the excitation and measurement are diametrically oppositely located in the annular axial ends of the longitudinal axis of the sensor, and the stator covers.