SU1589085A2 - Device for measuring torque - Google Patents

Abstract

The invention relates to a measuring technique and can be used for contactless determination of torque on rotating shafts of machines and mechanisms, in particular, when testing agricultural machines. The aim of the invention is to improve the accuracy and the expansion of the working range. Under the action of the torque, the elastic insert 1 is deformed and the conductive turn 2 is displaced from the neutral to one side or the other, depending on the sign of the torque. At the same time, at the output of the measuring winding 5, an emf is induced, which through the differential amplifier 7 and the integrator 8 is fed to the input of the current regulator 9, which controls the amount of current in the excitation winding 4. The increments of the voltage drop across the resistor 10 are proportional to the magnitude of the torque. 1 il.

Description

The invention relates to measuring equipment, can be used for contactless determination of torque on the rotating shafts of machines and mechanisms, in particular when testing agricultural-5 machines, and is additional to the author. St. No. 903715.

The aim of the invention is to increase accuracy and expand the operating range.

The drawing shows a structural diagram. device ma.

The torque measuring device comprises an elastic insert 1, a conductive short-circuited coil 2, a fixed ring element 3, an excitation winding 4, a measuring winding 5, bearings 15, a differential amplifier 7, an integrator 8, a current regulator 9, and a resistor 10.

The device operates as follows.

When a pulse voltage of ₂ higher frequencies (1000–5000 Hz) is applied to the excitation winding 4, consisting of two sections, a magnetic flux uniformly distributed along the length of the magnetic circuit is generated in the gap of the magnetic system made of an annular element 3, inducing 25 EMF in the measuring winding 5. In the absence of torque applied to the elastic insert 1, the conductive coil 2 is located in the magnetic neutral and the EMF at the output of the measuring winding 5 is zero. Under the influence of ³⁰ applied torque, the elastic insert 1 is deformed and the conductive coil 2 is shifted from the neutral in one direction or another, depending on the value of.

ka applied torque. In this case, at the output of the measuring winding 5, an EMF is proportional to the displacement of the conductive coil 2 from the neutral, which is fed to the inputs of the differential amplifier 7, the output signal of which is integrated using the integrator 8 until the current value in the excitation winding 4, controlled by the current regulator 9 will not be sufficient to create an electrodynamic force that returns the conductive coil 2 to the magnetic neutral.

The voltage drop increment (Δί /) on the resistor 10 is proportional to the applied torque:

ΔΠ = Δ4 _ΟίΓ - /? _06Р ξξΓξξξξΜμ = X, where X is the movement of the conductive coil 2;

F is the electrodynamic force; Rose — resistor 10;

M _ke - torque.

Claims (1)

Claim Device for measuring torque according to ed. St. No. 903715, characterized in that, in order to increase accuracy and expand the operating range, a reference resistor, integrator, current regulator and differential amplifier are introduced into it, the inputs of which are connected to the corresponding ends of the measuring winding, and the output through the integrator is connected to the control input of the current regulator connected in series with the field winding and an exemplary resistor.