Research on Inductance Measurement of Rotor Blade Edge

In modern industry, compressor blades are the key components of compressors. Blade quality is one of the important indicators to evaluate the quality of the whole compressor. The manufacturing and detection accuracy directly affects the energy conversion efficiency and working performance of the compressor. The shape of the blade is more complicated and special. The parameters described are numerous, and the measurement of blade shape, edge, and positional relationship is also the key to the entire blade. The measurement of the blade edge profile is generally achieved by measuring the profile of several sections distributed in the axial direction of the blade. Regarding the measurement of the blade edge profile, although there are many methods for measurement at present, each measurement method has its own characteristics, but from the aspects of measurement efficiency, measurement accuracy and cost, these methods have certain deficiencies, generally not It has speciality and data processing is not flexible enough. At present, the inductance measuring instrument is a development trend of measuring the blade profile and the blade edge profile. Based on the measurement of the blade edge, this subject designs a measurement efficiency, low price, easy to use, and is suitable for the workshop. And the special measuring instrument for the edge of the compressor blade used by the metrology department - the inductance measuring instrument.

1. The working principle of the inductor and the role of the inductor

The working principle of the inductor: the inductor is the same as the electronic component, it is a coil, but in fact this coil can use the magnetic properties of the coil to provide some useful functions. When a direct current is passed through the inductor, only a fixed magnetic field line is present around it, which does not change with time. However, when an alternating current is passed through the coil, magnetic lines of force appearing around it will appear around the time. When the current begins to flow in the coil for the first time, the coil forms a magnetic field. The coil prevents the flow of current during the formation of the magnetic field. Once the magnetic field is formed, the current can pass through the wire normally. When the switch is turned on, the magnetic field around the coil causes current to flow in the coil until the magnetic field disappears. This current allows the bulb to remain illuminated for a period of time even when the switch is turned on. In other words, the inductor can store energy in its magnetic field and by preventing any change in the magnitude of the current flowing through it.

The role of the inductor: First, the choke of the inductor, the inductor has a hindrance to the AC current, followed by the tuning and frequency selection. The inductor and the capacitor are connected in parallel to form an LC tuning circuit. That is, the natural oscillation frequency f 0 of the circuit is equal to the frequency f of the non-AC signal, and the inductive reactance and capacitive reactance of the loop are also equal, so that the electromagnetic energy oscillates back and forth between the inductor and the capacitor, which is the resonance phenomenon of the LC loop. At the time of resonance, the inductive reactance and capacitive reactance of the circuit are reversed. The total inductance of the loop is the smallest and the current is the largest. The LC resonant circuit has the function of selecting the frequency and can select the AC signal of a certain frequency f. The inductor also has the functions of filtering signals, filtering noise, stabilizing current, and suppressing electromagnetic interference.

The subject uses the role of the filter signal of the inductor. Initially we input the theoretical data into the computer, and the measured data is collected by the inductor contact during the measurement process, and then compared with the theoretical data.

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