RU2252402C1 - Device for non-contact measuring of torque - Google Patents

Abstract

FIELD: measuring equipment engineering.

SUBSTANCE: device has rotor, stator and electronic processing block. On the rotor, tension bridge, converter of voltage into frequency, stabilizing rectifier, rotating winding of transformer are placed. On stator pulse amplifier is placed, connected to converter by capacitor of capacity communication, having fixed plate and fixed winding of transformer. Fixed plate of capacitor is placed in electric field of rotary transformer winding. Converter and amplifier of pulses are electrically connected to each other by common mass, output of converter is connected to rotary winding of transformer.

EFFECT: higher reliability.

3 cl, 1 dwg

Description

The invention relates to instrumentation and can be used in the development of equipment for monitoring and measuring torque.

Known devices for measuring torque (see AS USSR No. 538247 from 09/03/75, class MKI G 01 L 3/10).

The disadvantage of this device is the lack of reliability of its operation at high speeds of the shaft.

A known device for non-contact measurement of torque (see the information-analytical magazine “Gas Turbine Technologies” issue No. 5 (26), 2003, pages 34-35 - prototype), including a rotor containing a strain gage, a voltage to frequency converter, a rotating winding a transformer, a rectifier and a stator with a pulse amplifier located on it, a fixed winding of the transformer, an electronic processing unit, and the pulse amplifier and converter are connected by capacitive coupling, including a rotating and fixed plate to ndensatora.

A disadvantage of the known device is the insufficient reliability of the device at elevated rotor speeds, when the rotating plate of the capacitor due to centrifugal forces begins to deform and peel off until fracture, which reduces the accuracy and reliability of the entire device.

The aim of the proposed device is to eliminate this drawback, i.e. increase the reliability of his work.

This goal is achieved by the fact that in the known technical solution comprising a rotor with a strain bridge placed on it, a voltage to frequency converter, a stabilizer rectifier, a rotating transformer winding and a stator with a pulse amplifier located on it, connected to the converter with a capacitor coupling capacitor having a fixed plate , the fixed winding of the transformer, the electronic information processing unit, the fixed plate of the capacitor is located directly in the electric field the transformer winding, the converter and the pulse amplifier are electrically connected to each other by a common “mass” (ie common ground), and the output of the converter is connected to the rotating winding of the transformer, which makes it possible to exclude such a structural element as a rotating capacitor plate, and its implementation function transfer capacitive coupling to the rotating winding of the transformer.

The scheme of the proposed device is presented in the drawing, where

1. Strain bridge

2. Voltage to frequency converter

3. Rectifier-stabilizer

4. Rotating winding of the transformer

5. The pulse amplifier

6. Fixed capacitor plate

7. Fixed transformer winding

8. Alternator

9. Electronic processing unit

A - rotor

B - stator.

The rotor A is rigidly fixed: a strain gauge 1, a converter 2, a rectifier-stabilizer 3, a movable winding of a transformer 4, and one shoulder of the strain gauge 1 is connected to the input of the converter 2, and the second to the rectifier-stabilizer 3, the input of which is connected to the winding 4. Output Converter 2 is also connected to winding 4.

On the stator B there is a stationary winding 7 connected to an alternating voltage generator 8, a pulse amplifier 5, the output of which is connected to an electronic information processing unit 9, and an input with a fixed plate of a capacitor 6 located directly above a part of the movable winding 4 of the transformer in the zone of its effective operation electric field.

The converter 2 and the pulse amplifier 5 are interconnected by means of “grounding”, i.e. through the “mass”, since the main bearing parts of the stator and rotor are made of electrically conductive materials.

The device operates as follows: supply voltage U _pit. is fed to an alternating voltage generator 8, from the output of which an alternating voltage is supplied to the fixed winding of the transformer 7. The electromagnetic field generated by the winding 7 excites an electric current in the rotating winding 4, which is rectified and stabilized by the stabilizer-rectifier 3 and fed to the strain gauge 1.

During rotation and load of the rotor, the resulting deformation is transmitted to the strain gauge strain gauge 1, which produce an unbalance signal of the bridge, characterizing the magnitude of the torque that is supplied to the Converter 2, converting it to frequency. This frequency signal is fed to the rotating winding 4.

The electric capacitance formed by this winding and the fixed plate of the capacitor forms a capacitive coupling through which the converted unbalance signal is supplied to the pulse amplifier 5.

The second channel of this connection is the electrical connection through the “mass”, i.e. conductive structural elements of the rotor and stator.

From the pulse amplifier 5, a signal carrying information about the value of the torque is supplied to the electronic information processing unit 9, which converts it and gives out in the form of a digital indication. The absence in the proposed device of such an element as a rotating capacitor plate and the implementation of capacitive coupling using the existing winding 4 eliminates the likelihood of delamination and destruction of the capacitor plate.

Thus, the use of the proposed technical solution will improve the accuracy of measurements and the reliability of the structure at high rotor speeds.

Claims (3)

1. A non-contact torque measurement device comprising a rotor with a strain bridge mounted on it, a voltage to frequency converter, a stabilizer rectifier, a rotating transformer winding and a stator with a pulse amplifier located on it, connected to the converter by a capacitor coupling capacitor having a fixed plate, a fixed winding transformer, electronic processing unit, characterized in that the fixed plate of the capacitor is located in the electric field of the rotating winding ransformatora converter and a pulse amplifier are electrically interconnected by total weight, and the inverter output is connected to a rotating winding of the transformer. 2. The device according to claim 1, characterized in that the capacitor plate is located above the rotating winding of the transformer. 3. The device according to claim 1, characterized in that the capacitor plate is located above part of the rotating winding of the transformer.