Abstract
Noncontacting torquemeters calibration is one of the acute tasks currently. Such sensors are widely used in measuring torques and torsional oscillations of elastic shafts of industrial plants and electromechanical systems. Noncontacting torquemeters must be properly calibrated before they are used to measure torque and torsional oscillations of rotating shafts. The paper describes a new approach to solving the task of calibration of noncontacting torquemeters and torsional oscillations meters of elastic shafts. The approach is based on the finite elements method as well as realized in the measuring device – torquemeter. The torquemeter allows to measure little torques and torsional oscillations of elastic shafts of electromechanical complexes.
Highlights
Diagnostic systems are widely used to determine the dynamic state of rotating electrical machines
Identification of attributes is one of the most time-consuming tasks in their development of vibration diagnostics systems. These attributes determine the intervals of good or fault state of the machine. This task solution is connected to measuring torques and torsional oscillations on elastic rotating shafts of electromechanical complexes [3,4,5]
Rotating shafts noncontacting torquemeters calibration is based on the use of measuring system, comprising reference high voltage amplifier HVAо, its voltage U (t) changing by sinusoidal harmonic law, delay line, High-voltage differential amplifier (HVDA) voltage subtraction circuit, analogue-to-digital converter ADC, computing machine and indicator
Summary
Diagnostic systems are widely used to determine the dynamic state of rotating electrical machines. 2. Measuring rotating shafts torsional deformation by symmetrical saw-tooth law of HVA output voltages. Symmetrical saw-tooth law of HVA output voltages (Fig. 1(a), (b)) is used in the torquemeter to measure rotating shafts torsional deformation [1, 3, 4, 6, 7]. As a result of subtraction of two output HVA high voltages on HVDA circuit input appears differential beat voltage u (t) = u (t) (Fig. 3(c)). ΔU of high voltage amplifiers can up to 200 V, and F – dozens of Hz. After subtracting reference and shifted instantaneous HVA output high voltages in HVDA circuit, at its input instantaneous differential beat voltage is singled out, coming on the input of analogue-to-digital converter (ADC).
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