SU1252663A1 - Variable reluctance pickup - Google Patents

Abstract

The invention relates to a measurement technique and can be used to convert a small angular deviation of an object from its initial position into an electrical signal, which allows to obtain high accuracy of measurement by increasing the resolution and reducing the reactive pulling moment between the stator and the rotor of the induction sensor. The sensor contains a smooth stator with an annular slot in its middle, in which the field winding is laid, supplied with alternating current. Symmetrically with respect to the excitation winding are located on the stator a pair of sections of the measuring windings, evenly distributed along its periphery. Sections of the measuring windings are included in each pair. The rotor, which is kinematically connected to the object during the measurement process, has a serrated profile. The number of teeth of the rotor is equal to the number of pairs of sections of the measuring winding. When the rotor deviates from the initial position, the EMF in the sections of the measuring windings change: in one of them the EMF increases and in the other decreases, due to which, at the sensor output, it detects a difference signal proportional to the deviation of the displaced object from the initial position measuring range of +3. 2 Il. (L

Description

The invention relates to a measuring technique and can be used to convert a small angular deviation of an object from its initial position into an electrically signal.

The purpose of the invention is to improve the accuracy by increasing the resolution of the sensor and reducing the reactive moment of radiation.

FIG. Figure 1 shows schematically the design of an induction sensor; in fig. 2 - construction of a smooth stator.

The sensor contains a smooth stator I with an annular slot 2, which divides it into two symmetrical parts 3 and 4. The excitation winding 5 is laid in the annular slot. On each part of the stator 1, symmetrically with respect to the excitation winding 5, there are pairs of flat sections 6 and 7 of the measuring windings uniformly distributed along the stator periphery. These pairs are located one under another symmetrically with respect to the excitation winding. Sections of the measuring windings are connected in series to each other in each pair. The rotor 8, which is kinematically associated with the object during the measurement, has a gear profile. The number of teeth 9 of the rotor 8 is equal to the number of pairs of sections of the measuring windings. The dimensions of the teeth 9 and sections 6 and 7 of the measuring windings are determined by the operating range of the measured deviation angles from the initial position of the rotor. An alternating current source (not shown) is connected to the excitation winding 5. The plane of the excitation winding 5 is perpendicular to the plane of the measuring winding sections.

The induction sensor for changing the angular position of an object operates as follows.

The excitation magnetic flux created by the excitation winding 5 supplied by alternating current induces an emf in sections 6 and 7 of the measuring

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windings. With a symmetrical arrangement of the teeth 9 of the rotor 8 relative to sections 6 and 7 of the measuring windings, the EMF in these sections are of the same magnitude. Since sections 6 and 7 are on counter, the sensor output is zero. When the angular position of the rotor 8 changes, the magnitudes of the magnetic flux and the emf induced in sections 6 and 7 change; in one of them the emf increases, in the other it decreases. As a result, an output signal appears, equal to the difference in emf of the sections of the measuring windings and proportional to the angle of rotation of the rotor. The emf induced in the sections of the measuring windings is transferred to a measuring circuit (not shown) where they are summed, thereby increasing the sensitivity of the sensor. The operating range of the measured deviation angles of the sensor rotor 8 from its initial position is limited to ± 3. The absence of teeth on the stator reduces the reactive moment of drawing, which leads to an increase in the resolution and accuracy of measuring changes in angles in a given range.

Claims (1)

Invention Formula An induction sensor for changing the angular position of an object, containing a toothed non-winding rotor, a stator consisting of two symmetrical parts with an annular slot between them, an annular field winding placed in this slot, and uniformly distributed along the periphery of both parts of the stator of the measuring windings section, characterized by in order to increase accuracy by increasing the resolution and reducing the reactive torque, the stator is made smooth, the measuring winding sections made flat they are placed in pairs on the surface of the stator and are connected in series, in all pairs. Figg