SU491053A1 - Device for measuring the torque on the shaft - Google Patents

Description

This invention relates to the field of load engineering.

The known devices for measuring the torque on the shaft, comprising a housing, a shaft twist angle sensor mounted on the shaft, a contactless current-transmitting unit and a measuring circuit, do not provide the required measurement accuracy.

In the proposed device, this drawback is eliminated due to the fact that the current-transmitting node is made in the form of a cylindrical winding mounted concentrically on the shaft and covering the winding of U-shaped magnetic cores mounted on the housing with a gap relative to each other, and the windings located on the magnetic cores are wound with a step decreasing in geometric progression towards clearance.

The drawing shows a diagram of a device for measuring the torque on a shaft.

The device consists of rings 2, 3 mounted on shaft 1, to which current windings 5 and 5 are attached by means of connecting elements 4. Winding cages 5 and 6, connecting elements 4, as well as bearings 7 and 5 are made of diamagnetic electrically insulating materials. A rod 9 is fixed on the ring 3, located along the shaft and passed into the hole inside the ring 2. The end of the rod 9 ends with a plate made of ferromagnetic material, on both sides of which there are magnetic conductors of inductive sensors 10 and 11. The magnetic conductors together with the measuring windings of current transformers 12, 13 and 14, 15 are fixed on the bearing 7, and 16, 17 and 18, 19 on the bearing 8. The measuring windings of the magnetic laws 12-19 are wound with decreasing in a geometrical progression as the air gaps approach.

Current windings 5 6 are connected respectively to inductive sensors 10 and //. The measuring windings of current transformers are interconnected sequentially in pairs so that the magnetic flux created by them is added up, and the directions of the currents in current transformers loaded on the common current winding are chosen such that the emf generated by them is summed.

The measuring windings of the transformers gok connected in parallel,

connected in series with the primary windings of the transformers Tp and Tp in two circuits connected in parallel to a stabilized AC voltage. Voltages from secondary windings of transformers after rectification and filtration

are differentially supplied to the meter, A.

The resistors, 4, 5 and R, which are connected to the bridge and connected to a stabilized DC voltage — C / 1, 4, 5, and R are the DL5 circuit settings to zero.

Under the action of torque M, the portion of the shaft located between the rings 2 W. 3 twists, due to which the air gap S in the magnetic circuit of the sensor W increases and its inductive resistance decreases. At the same time, the air gap 6i of the sensor // is reduced, and its inductive resistance increases. A decrease in inductive resistance of sensor 10 causes an increase in the flow of current through it from the current winding to which it is connected, which affects the magnetic fields of current transformers loaded on this winding and reduces the reactive resistances of their measurement windings. An increase in the inductive resistance of the sensor And increases the reactance of the measuring windings of current transformers loaded on the current winding to which the sensor is connected.

A decrease in the reactances of the measuring windings of current transformers reduces the voltage drop on them and simultaneously increases the voltage drop on the primary winding of a transformer connected in series with them, which increases both the voltage on its secondary winding and the voltage on the C-circuit. current in the secondary cei. Similarly, an increase in the reactance of the measuring windings is different.

groups of current transformers lowers the voltage of the direct current allocated in the secondary circuit connected in series with the transformer. Since the DC voltages formed on the chains and RzCz are differentiated between them; 1no, the guide between the points is dependent on the magnitude and direction of the torque M

potential difference, which is fixed by regi p and p y CHI M p p and b or o m.

By winding the windings of the magnetic cores with a step: m decreasing exponentially in the direction of the gap, a uniform field is provided in the area of the current winding. As a result, noises due to longitudinal and transverse vibrations of the shaft are eliminated, which improves the measurement accuracy.

I

Subject invention

A device for measuring lumenta shaft, comprising a housing mounted on

shaft shaft twist angle sensor, contactless current & reducing node and measuring circuit, characterized in that, in order to improve accuracy, the current transmitting node is made in the form of concentrically fixed

on the shaft of the cylindrical winding and covering the winding of the U-shaped magnetic cores mounted on the housing with a gap relative to each other, the windings located on the magnetowires are wound with a step decreasing exponentially in the direction of the gap.