SU678352A2 - Submersible electric motor torque measuring device - Google Patents

Description

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The invention relates to the field of load measuring technology and can be used to measure the torque of a submersible electric motor and electric pumps in the oil and gas industries.

The main author. St. No. 465568 is protected by a device for measuring a rotating submersible electric motor, containing an active power sensor, a quad, multiplying circuits, adders, a signal compensator proportional to the idling power of the submersible electric motor, with a correction chain including a series-connected quad, multiplier and dividing device, an adder and a duplicating device connected in parallel, the input of which is connected to the output of the quad, and the output to the adder of the correction chain is connected ene to the input active power the sensor, and the output of active power sensor and the correcting circuit is connected to the main input of the summing device. The output of the main summing device is connected to the input of the compensator, which subtracts the idle signal

the stroke of the submersible electric motor. A disadvantage of the device is the insufficient accuracy of torque measurement due to the negligence of the slip error of the engine.

The aim of the invention is to improve the accuracy of measuring the torque of a submersible electric motor. This is achieved by the fact that an additional adder, a separating device and a signal adjuster, proportional to the synchronous rotation frequency of the submersible electric motor, whose input is connected, are introduced into it.

5 to the power source of the submersible electric motor, and a signal compensator proportional to the idling power, the input of which is connected to the power source of the submersible electric motor, is connected to the input of the main adder, the input of the additional adder being connected to the output of the main adder

5 and a signal generator, proportional to the synchronous rotation frequency of the submersible electric motor, and the output to the input of the auxiliary device, the input of which is also supplied by the output signal of the main adder, the output of the depot device is connected to the registering device. The drawing shows the block diagram of the proposed device. It contains the active power sensor 1, the correction chain 2, the compensator 3, the summing devices 4 and 5, the dividing device b, the registering device 7 and the synchronous rotating frequency 8. The voltage U at the output of the active power sensor 1 connected to the power supply system (not shown) of the submersible electric motor is proportional to the input power measured at the surface. A signal proportional to the value of the phase current is applied to a correction chain 2, the output value of the voltage U2 of which is proportional. power loss in the current lead and in the motor. Main adder 4 subtracts Uj from voltage U. In idle mode, the torque of the submersible motor is zero, although it consumes a certain amount of power from the mains. To compensate for the signal corresponding to the idling power of the electric motor, a compensator 3 is used, the input of which is connected to a power source (not shown in the drawing) and the output to the main adder 4. Thus, in the main adder 4, a signal proportional to that measured on the surface the power consumed is subtracted by signals proportional to the idling power of the submersible electric motor, power losses in the current lead and in the motor. The output voltage of the main adder 4, proportional to the power on the shaft of the submersible electric motor 4-Ul-VV- l B-- B is fed to the input of the additional summator 5, to which also a signal proportional to the synchronous frequency of rotation of the submersible electric motor (, from setting device 8, the input of which is connected to the power source of the submersible electric motor. Since in the working part of the mechanical characteristic of the submersible electric motor, the slip is proportional to the power on its shaft .S, where C is the ratio proportional to Ionities between power and engine slip equal to S, we can write down that 04jUo-u; j., s 0.1 - .tp - to N where K is the proportionality coefficient. In the additional sucmator 5 from the signal proportional to the synchronous rotation frequency of the engine, subtracts the signal proportional to the power on the shaft. The output voltage of the additional adder 5, proportional to the frequency of rotation of the submersible motor Ug 1l) KjiJ is fed to the input of the dividing device b. A signal from the main adder 4, proportional to the power on the shaft, is also fed to the input of the dividing device 6. In the divider device b, the operation is performed to divide the signal, which is proportional to the power on the shaft U, by a signal proportional to the rotation frequency of the submersible electric motor Ug. The output voltage U of the dividing device proportional to the torque of the submersible electric motor transmitted to the bit, taking into account the error caused by the slip change, is fed to the input of the recording device 7. Using the device will improve the accuracy of measuring the torque of the submersible electric motor. Formula of the Invention A device for measuring the torque of a submersible electric motor according to the author, St. 465568, characterized in that, in order to improve the measurement accuracy, an additional adder, a separating device and a signal adjuster, proportional to the synchronous rotation frequency of the submersible electric motor, are inputted to the power supply of the submersible electric motor, and the compensator of the signal proportional to the idling power, the input which is connected to the power source of the submersible electric motor is connected to the input of the main adder, the input of the additional adder being connected ene yield primary adder and the setter signal proportional to the synchronous speed of rotation immersion elektrodviga5678352

bodies, and with the input of a dividing device, to the input of which the output signal of the main cyNwaTopa is also fed, the output of the dividing device is connected to a recording device.

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