inductive sensors. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Sensors Inductive sensors. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

Inductive Sensors - these are devices that serve to non-contactly obtain information about the movements of the working parts of machines, mechanisms, robots and convert this information into an electrical signal.

Operating principle The inductive sensor is based on a change in the inductance of the winding on the magnetic circuit depending on the position of the individual elements of the magnetic circuit (armature, core, etc.).

In such sensors, linear or angular movement X (input quantity) is converted into a change in inductance (L) of the sensor. Are applied for measuring angular and linear movements, deformations, dimensional control, etc.

In the simplest case, an inductive sensor is an inductive coil with a magnetic core, the moving element of which (the armature) moves under the influence of the measured value.

The inductive sensor recognizes and reacts accordingly to all conductive objects. The inductive sensor is non-contact, does not require mechanical action, and works contactlessly due to changes in the electromagnetic field.

Advantages:

no mechanical wear, no failures associated with the condition of the contacts;
there is no bounce of contacts and false alarms;
high switching frequency up to 3000 Hz;
resistant to mechanical stress.

Disadvantages:

relatively low sensitivity;
dependence of the inductive reactance on the frequency of the supply voltage, a significant reverse effect of the sensor on the measured value (due to the attraction of the armature to the core).

Author: Koryakin-Chernyak S.L.

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