Air gap detection method and device for electromagnetic induction generator

An electromagnetic induction and detection device technology, which is applied in the field of electromagnetic induction generator air gap detection, can solve problems such as low precision, nonlinear measurement, complex devices, etc., to achieve easy judgment, avoid interference from parasitic and stray capacitance, Simple Effects of Data Analysis

Active Publication Date: 2017-12-29
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the existence of parasitic capacitance, this method is nonlinear in measurement and the accuracy is not high; at the same time, the device is relatively complicated and requires an external excitation source to achieve measurement

Method used

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  • Air gap detection method and device for electromagnetic induction generator
  • Air gap detection method and device for electromagnetic induction generator
  • Air gap detection method and device for electromagnetic induction generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, a detection coil 4 with a single layer in the axial direction, 15 turns and an outer diameter of 10 mm is wound with 0.1 mm insulated copper wire. Taking a generator with 8 stator poles as an example, according to figure 1 and image 3 As shown, the detection coil 4 is arranged continuously on the inner surface of each stator tooth in the circumferential direction, and the detection coil 4 is located at the axial midline of the stator, and only one detection coil 4 is arranged axially on the inner surface of each stator tooth; when the detection coil is arranged, according to Figure 5 As shown, the search coil 4 is completely attached to the inner surface of the stator tooth. When the motor is running, the induced voltage of the detection coil 4 is measured by the induced voltage signal measuring device 5, and the waveform of the induced voltage is used to judge whether the circumferential direction of the air gap is uniform. If the induced voltage signals me...

Embodiment 2

[0033] First, a detection coil 4 with a single layer in the axial direction, 10 turns and an outer diameter of 8 mm is wound with 0.2 mm insulated copper wire. Taking a generator with 8 stator poles as an example, according to figure 2 and Figure 4 As shown, the detection coils 4 are evenly spaced on the inner surface of the stator teeth in the circumferential direction, and three detection coils 4 are arranged at an axial equidistant distance on the inner surface of the stator teeth, wherein the second detection coil is located at the axial centerline of the stator, and the other two The two detection coils are located at both ends of the stator axial; when arranging the detection coils, according to Figure 5 As shown place the search coil completely against the inner surface of the stator tooth. When the motor is running, the induced voltage of the detection coil 4 is measured by the induced voltage signal measuring device 5, and the waveform of the induced voltage is u...

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Abstract

An electromagnetic induction generator air gap detection method and device thereof, comprising a detection coil and an induced voltage signal measuring device, the detection coil is closely attached to the inner surface of a stator, and the shape of the detection coil matches the radian of the inner surface of the stator. Using the electromagnetic field generated when the generator itself is running, the induced electromotive force generated by the rotation of the rotor is measured through the detection coil placed on the inner surface of the stator, and finally the gas is detected in real time according to the mathematical relationship between the induced electromotive force and the air gap between the stator and the rotor. Whether the gap is even. The present invention is an electromagnetic induction generator air gap detection method and its device. The method and its device do not need an external excitation source in the measurement process; there is no influence of parasitic and stray capacitance; the induced voltage and the stator-rotor air gap are almost in the same Linear relationship, data analysis is simple.

Description

technical field [0001] The invention discloses an electromagnetic induction generator air gap detection method and a device thereof, which belong to the field of generator fault detection. Background technique [0002] The generator is mainly composed of stator, rotor, end cover, frame, bearing and other components. The stator rotates and cuts the magnetic induction line to generate induced electromotive force, which is drawn out through the terminal to realize power generation. When the generator is running, if the shaft of the generator is curved, the rotor is not round, or the center of the stator and the axis of the rotor do not coincide, the air gap between the stator and the rotor will be uneven, resulting in unbalanced magnetic pull; The tension moves periodically along the circumference, causing the unit to vibrate; the vibration of the generator set will cause cracking of the welding points of the unit, fatigue of parts, and directly affect its service life. The un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
Inventor 邱立吴训松邓长征李振兴李振华
Owner CHINA THREE GORGES UNIV
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