Three-dimensional space magnetic flux density array type measuring device

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a three-dimensional space magnetic flux density array type measuring device. According to the three-dimensional space magnetic flux density array type measuring device, the magnetic flux density sensor units have the advantages of being flexible in installation, small in size, low in cost, multiple in measuring point and the like, interventional extraction of three-dimensional space air gap magnetic flux density signals of a rotating motor is achieved, and the three-dimensional space magnetic flux density array type measuring device can be placed in a stator groove without damaging the integrity of a motor core; magnetic flux density signals collected by the sensor can effectively identify time-space changes of a magnetic field in the motor air gap, and accurate monitoring of an air gap eccentricity fault can be achieved by reasonably arranging Hall elements on the sensor.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear power technology, and in particular relates to a three-dimensional magnetic flux density array measurement device. Background Art

[0002] The rotating machinery of nuclear power plants is developing in the direction of large-scale, high-speed, integrated, digital and intelligent. Whether the production equipment can operate normally under trouble-free conditions is crucial to improving production efficiency and ensuring safe production. There is a rotating magnetic field in the air gap of the driving motor of the rotating equipment, which is generated by the interaction of the stator and rotor magnetic fields. However, due to manufacturing tolerances or other eccentricity faults, the air gap magnetic flux density cannot be guaranteed to be absolutely uniform. The unbalanced electromagnetic excitation force generated by this type of non-uniform air gap magnetic field will cause electromagnetic vibration of the system, posing a huge hidden danger to the safe and stable operation of the rotating equipment.

[0003] In the related technologies, a lot of information can be used for fault diagnosis and status monitoring of rotating machinery in energy equipment, mainly including temperature, noise, vibration and stress, etc. These parameters have certain limitations in the reliability of identifying fault characteristics. In addition, due to the large magnetic resistance of air, magnetic flux density sensors are usually in an invasive form, and the existing magnetic flux density measurement devices cannot adapt to the measurement environment and conditions inside the motor. Therefore, it is urgent to effectively monitor the non-uniform characteristics of the rotating machinery magnetic field in nuclear power plants. Summary of the invention

[0004] In order to overcome the problems existing in the related art, a three-dimensional magnetic flux density array measuring device is provided.

[0005] According to one aspect of an embodiment of the present disclosure, a three-dimensional magnetic flux density array measurement device is provided, the device comprising: a magnetic flux density sensor array, a signal output probe, and a signal acquisition instrument, the magnetic flux density sensor array comprising a plurality of magnetic flux density sensor units;

[0006] Each magnetic flux density sensor unit includes a Hall element, a gold finger, and a flexible circuit board. The flexible circuit board is a double-sided circuit board. The circuit boards on both sides of the flexible circuit board are connected to each other through connecting holes to realize double-layer circuits. Signal lines, Hall elements, and gold fingers are arranged on the front of each flexible circuit board. The Hall element outputs a voltage signal by inducing changes in the magnetic field, which is transmitted to the signal output probe through the gold finger and finally to the signal acquisition instrument.

[0007] In a possible implementation, when the device is in use, first, multiple sensor array units are fixed in the stator slots of the motor respectively, and are evenly arranged around the center of the motor stator, with the side of each sensor array unit with the Hall element facing the rotor, and the side with the gold finger placed on the side wall of the stator slot; then, the power is turned on, and the conductive contacts corresponding to the power lines in the gold fingers are connected to power the Hall elements connected in parallel on each sensor array unit; the motor is started, and a rotating magnetic field begins to be generated in the air gap of the motor. The Hall element senses the change in the magnetic field and outputs a voltage signal. The voltage signal is transmitted to the corresponding conductive contacts in the gold fingers through the signal line, and the voltage signal is transmitted to the signal acquisition instrument through the signal output probe. The signal acquisition instrument determines the magnetic flux density signal based on the multiple voltage signals received.

[0008] In a possible implementation, the three-dimensional magnetic flux density array measurement device includes a plurality of magnetic flux density sensor units of different sizes.

[0009] In a possible implementation, the Hall element is soldered to the surface of the flexible circuit board by convection soldering, and the signal output probe should correspond to the Hall element one by one.

[0010] In one possible implementation, the power line is arranged on the back of the circuit board, and each parallel Hall element shares the same power line. The signal line is arranged on the front of the circuit board, and each Hall element is arranged with a separate signal line. The line of the back circuit board is connected to the front circuit board through the connection hole on the circuit board. Each Hall element is provided with four pins, of which one side of the diagonal pin is the power supply end, and one side of the diagonal pin is the signal end.

[0011] The beneficial effects of the present disclosure are as follows: the magnetic flux density sensor unit of the three-dimensional magnetic flux density array measurement device provided by the present disclosure itself has the advantages of flexible installation, small size, low cost, and multiple measuring points, and realizes the intrusive extraction of the three-dimensional air gap magnetic flux density signal of the rotating motor, and can be placed in the stator slot without damaging the integrity of the motor core; the magnetic flux density signal collected by the sensor can effectively identify the time-space changes of the magnetic field inside the motor air gap, and accurate monitoring of the air gap eccentricity fault can be achieved by reasonably arranging the Hall elements on the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a three-dimensional magnetic flux density array measurement device shown in an embodiment of the present disclosure.

[0013] Figure 2 It is a schematic diagram of a three-dimensional magnetic flux density sensor array shown in an embodiment of the present disclosure.

[0014] Figure 3 It is a schematic diagram of a three-dimensional magnetic flux density sensor array unit shown in an embodiment of the present disclosure.

[0015] Figure 4 It is a circuit connection diagram of the front side of the flexible circuit board of the magnetic flux density sensor shown in the embodiment of the present disclosure.

[0016] Figure 5 It is a circuit connection diagram on the back side of the flexible circuit board of the magnetic flux density sensor shown in the embodiment of the present disclosure.

[0017] In the figure:

[0018] 1. Magnetic flux density sensor array; 2. Magnetic flux density sensor unit; 3. Hall element; 4. Gold finger;

[0019] 5. Flexible circuit board; 6. Power cord; 7. Signal line; 8. Connection hole; 9. Signal acquisition instrument;

[0020] 10.Signal output probe. DETAILED DESCRIPTION

[0021] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative efforts are within the scope of protection of the present disclosure.

[0023] Reference to "embodiments" in this disclosure means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] like Figures 1 to 5As shown, the three-dimensional magnetic flux density array measuring device disclosed in the present invention includes: a magnetic flux density sensor array 1, a signal output probe 10, and a signal acquisition instrument 9. The magnetic flux density sensor array 1 includes a plurality of magnetic flux density sensor units 2 (for example, 12), each magnetic flux density sensor unit 2 includes a Hall element 3, a gold finger 4, and a flexible circuit board 5. The flexible circuit board 5 is a double-sided circuit board. The circuit boards on both sides of the flexible circuit board 5 are connected to each other through a connecting hole 8 to realize a double-layer circuit. The front side of each flexible circuit board 5 is arranged with a signal line 7, a Hall element 3, and a gold finger 4. The Hall element 3 outputs a voltage signal by inducing a change in a magnetic field, which is transmitted to the signal output probe 10 through the gold finger 4 and finally transmitted to the signal acquisition instrument 9. A power line 6 is arranged on the back side of the double-sided circuit board.

[0025] When using the device disclosed in the present invention for measurement, firstly, a plurality of sensor array units 2 are fixed in the motor stator slots respectively, and are evenly arranged around the center of the motor stator, with the side of each sensor array unit 2 with the Hall element 3 facing the rotor, and the side with the gold finger 4 being placed on the side wall of the stator slot. Then, the power is turned on, and the conductive contact corresponding to the power line 6 in the gold finger 4 is connected to power the Hall elements 3 connected in parallel on each sensor array unit 2. Then, the motor is started, and a rotating magnetic field begins to be generated in the air gap of the motor. The Hall element 3 senses the change in the magnetic field and outputs a voltage signal. The voltage signal is transmitted to the corresponding conductive contact in the gold finger 4 through the signal line 7, and the voltage signal is transmitted to the signal acquisition instrument 9 through the signal output probe 10. The signal acquisition instrument 9 determines the magnetic flux density signal based on the received multiple voltage signals.

[0026] The magnetic flux density sensor unit of the three-dimensional magnetic flux density array measurement device provided by the present invention has the advantages of flexible installation, small size, low cost, and multiple measuring points. It realizes the intrusive extraction of the three-dimensional air gap magnetic flux density signal of the rotating motor and can be placed in the stator slot without damaging the integrity of the motor core. The magnetic flux density signal collected by the sensor can effectively identify the time-space variation of the magnetic field inside the motor air gap, and accurate monitoring of air gap eccentricity faults can be achieved by reasonably arranging the Hall elements on the sensor.

[0027] In a possible implementation, the three-dimensional magnetic flux density array measurement device includes a plurality of magnetic flux density sensor units of different sizes, and the number, size, and spacing of the magnetic flux density sensor units can be flexibly changed according to the number and size of the motor stator slots.

[0028] In one possible implementation, Figure 3 As shown, the Hall element 3 is soldered on the surface of the flexible circuit board 5 by convection soldering, and the signal output probe 10 should correspond to the Hall element 3 one by one.

[0029] In one possible implementation, see Figure 4 and Figure 5 , the power line 6 is arranged on the back of the circuit board 5, and each parallel Hall element 3 shares the same power line 6. The signal line 7 is arranged on the front of the circuit board 5, and each Hall element 3 is arranged with a separate signal line 7. The line of the back circuit board is connected to the front circuit board through the connection hole 8 on the circuit board. Each Hall element 3 is provided with four pins, of which one diagonal pin is a power supply end, and one diagonal pin is a signal end. In this way, the magnetic flux density sensor unit realizes the integration of multiple functional elements in a smaller area through the above circuit arrangement.

[0030] In a possible implementation, the line Hall element may be a linear Hall element, which may output a voltage signal according to a change in magnetic flux density. The conversion between the voltage signal and the magnetic flux density signal may be achieved by calibrating the sensor sensitivity.

[0031] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A three-dimensional magnetic flux density array measuring device, characterized in that: The device comprises: a magnetic flux density sensor array, a signal output probe, and a signal acquisition instrument, wherein the magnetic flux density sensor array comprises a plurality of magnetic flux density sensor units; Each magnetic flux density sensor unit includes a Hall element, a gold finger, and a flexible circuit board. The flexible circuit board is a double-sided circuit board. The circuit boards on both sides of the flexible circuit board are connected to each other through connecting holes to realize double-layer circuits. Signal lines, Hall elements, and gold fingers are arranged on the front of each flexible circuit board. The Hall element outputs a voltage signal by inducing changes in the magnetic field, which is transmitted to the signal output probe through the gold finger and finally to the signal acquisition instrument.

2. The device according to claim 1, characterized in that When the device is used, firstly, a plurality of sensor array units are fixed in the stator slots of the motor respectively and are evenly arranged around the center of the motor stator, with the side of each sensor array unit with the Hall element facing the rotor and the side with the gold finger placed on the side wall of the stator slot; then, the power is turned on, and the conductive contact corresponding to the power line in the gold finger is connected to supply power to the Hall elements connected in parallel on each sensor array unit; Start the motor, and a rotating magnetic field begins to be generated in the motor air gap. The Hall element senses the change in the magnetic field and outputs a voltage signal. The voltage signal is transmitted to the corresponding conductive contact in the gold finger through the signal line, and then transmitted to the signal acquisition instrument through the signal output probe. The signal acquisition instrument determines the magnetic flux density signal based on the multiple voltage signals received.

3. The device according to claim 1, characterized in that The device includes a plurality of magnetic flux density sensor units of different sizes.

4. The device according to claim 1, characterized in that The Hall element is welded on the surface of the flexible circuit board by convection welding, and the signal output probe should correspond to the Hall element one by one.

5. The device according to claim 1, characterized in that The power line is arranged on the back of the circuit board, and each parallel Hall element shares the same power line. The signal line is arranged on the front of the circuit board, and each Hall element has a separate signal line. The line of the back circuit board is connected to the front circuit board through the connection hole on the circuit board. Each Hall element is provided with four pins, of which one diagonal pin is the power supply end, and the other diagonal pin is the signal end.

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