Magnetic suspension bearing radial displacement sensor testing device

Abstract

The utility model discloses a magnetic suspension bearing radial displacement sensor testing device comprising a positioning disc used for positioning and fixing a displacement sensor, the positioning disc adopts a hollow structure, and the displacement sensor is located on an inner hole in the center of the positioning disc. An eccentric target piece and a driving mechanism used for driving the eccentric target piece to rotate are arranged in the center of the positioning disc, the eccentric target piece is driven to rotate through the driving mechanism, a displacement sensor on the positioning disc detects the change of the distance between the displacement sensor and the side face of the eccentric target piece, and the performance of the displacement sensor is tested. According to the utility model, the sensor is tested by using the change of the distance between the eccentric target piece and the sensor generated by the rotation of the eccentric target piece, compared with the existing test mode, more movement distances can be provided, and the displacement sensor is electrically connected with the magnetic bearing main control board in the electric control box. Therefore, various performances of the sensor under the use condition of the magnetic bearing can be tested, and the detection result and the precision of the displacement sensor can be accurately tested.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor testing, in particular to a magnetic suspension bearing radial displacement sensor testing device. Background Art

[0002] The radial sensor is a very important component in the control of magnetic bearings. The performance of the sensor directly affects the stability of the magnetic bearings. Therefore, the performance test and evaluation of the radial sensor components is very important. At present, the evaluation of sensors is still the test of a single sensor element, which is easily affected by human operation. At the same time, it is impossible to test the performance of the sensor in the specific application of magnetic bearing control. Utility Model Content

[0003] Technical purpose: In view of the shortcomings of the above-mentioned existing displacement sensor tests, the utility model discloses a magnetic suspension bearing radial displacement sensor test device.

[0004] Technical solution: To achieve the above technical objectives, the utility model adopts the following technical solution:

[0005] A magnetic suspension bearing radial displacement sensor testing device comprises a positioning plate for positioning and fixing the displacement sensor, wherein the positioning plate adopts a hollow structure, the displacement sensor is located on an inner hole at the center of the positioning plate, an eccentric target piece and a driving mechanism for driving the eccentric target piece to rotate are arranged at the center of the positioning plate, the eccentric target piece is driven to rotate by the driving mechanism, the displacement sensor on the positioning plate detects the change in distance between the positioning plate and the side surface of the eccentric target piece, and the performance of the displacement sensor is tested.

[0006] Preferably, the positioning disk and the eccentric target of the utility model are both arranged on a mounting seat, and the mounting seat is provided with a step countersunk hole for cooperating with the positioning disk and the eccentric target, and the eccentric target and the step countersunk hole are matched through a graphite sliding bearing.

[0007] Preferably, the driving mechanism of the utility model adopts a stepping motor, and the driving end of the stepping motor is connected to the rotating shaft of the eccentric target through a coupling.

[0008] Preferably, a support frame is coaxially arranged below the mounting seat of the utility model, and a space for installing the stepping motor is formed inside the support frame.

[0009] Preferably, the displacement sensor and stepper motor of the utility model are both electrically connected to an electric control box, and a magnetic bearing main control board for receiving detection data of the displacement sensor and a stepper motor controller for controlling the rotation of the stepper motor are arranged in the electric control box.

[0010] Preferably, the testing device of the present invention is also provided with a display screen for displaying the test results.

[0011] Beneficial effects: The magnetic bearing radial displacement sensor testing device provided by the utility model has the following beneficial effects:

[0012] 1. The utility model installs the displacement sensor on the positioning plate, and cooperates with the displacement sensor through an eccentric target piece which is concentrically arranged with the rotation center and the positioning plate, so that multiple groups of displacement sensors can be synchronously detected at the same time. At the same time, the driving mechanism is used to drive the eccentric target piece to rotate continuously, so that multiple groups of test data can be collected to ensure the accuracy of the test results.

[0013] 2. The utility model uses a mounting seat to position the positioning disk and the eccentric target. The eccentric target and the stepped countersunk hole of the mounting seat are matched through a graphite sliding bearing. The concentricity of the mounting seat and the graphite sliding bearing is used to ensure the installation accuracy of the positioning disk, thereby realizing accurate testing of the displacement sensor.

[0014] 3. The utility model tests the sensor by utilizing the distance change between the eccentric target and the sensor caused by the rotation of the eccentric target. Compared with the existing testing method, it can provide a longer moving distance. At the same time, the distance change value between the eccentric target and the positioning plate can be directly obtained by calculation, so that the detection result and accuracy of the displacement sensor can be accurately tested.

[0015] 4. The utility model electrically connects the displacement sensor to the magnetic bearing main control board in the electric control box, thereby realizing various performance tests of the sensor when the magnetic bearing is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 This is a structural diagram of the test device of the utility model;

[0018] Among them, 1-displacement sensor, 2-positioning plate, 3-eccentric target, 4-mounting seat, 5-step countersunk hole, 6-graphite sliding bearing, 7-stepping motor, 8-coupling, 9-support frame. Implementation

[0019] The present invention will be described more clearly and completely below by way of a preferred embodiment in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiment.

[0020] like Figure 1The figure shows a magnetic bearing radial displacement sensor testing device disclosed by the utility model, including a positioning plate 2 for positioning and fixing the displacement sensor 1, the positioning plate 2 adopts a hollow structure, the displacement sensor 1 is located on the inner hole of the center of the positioning plate 2, an eccentric target 3 and a driving mechanism for driving the eccentric target 3 to rotate are arranged at the center of the positioning plate 2, the eccentric target 3 is driven to rotate by the driving mechanism, the displacement sensor 1 on the positioning plate 2 detects the distance change between the eccentric target 3 and the side surface, and the performance of the displacement sensor 1 is tested.

[0021] The relative position of the displacement sensor 1 and the positioning plate is fixed. As the driving mechanism drives the eccentric target 3 to rotate, the distance corresponding to the displacement sensor 3 changes, thereby realizing the test of the displacement sensor. In addition, the structure of the eccentric target can provide more displacement change values ​​than the existing testing method.

[0022] When testing the displacement sensor, based on the relative position between the eccentric target and the positioning plate, the distance distribution between the eccentric target and the inner hole of the positioning plate can be directly obtained by calculation, and the distance is corresponded to the rotation angle of the eccentric target. When testing the displacement sensor, the distance value corresponding to the installation orientation of the displacement sensor can be determined directly through the rotation angle of the eccentric target, thereby realizing rapid judgment of the displacement sensor detection results to improve test efficiency.

[0023] The positioning disc 2 and the eccentric target 3 of the utility model are both arranged on the mounting seat 4, and the mounting seat 4 is provided with a step countersunk hole 5 for cooperating with the positioning disc 2 and the eccentric target 3. The eccentric target 3 and the step countersunk hole 5 are matched through a graphite sliding bearing 6. When the device is processed, the mounting seat and the graphite sliding bearing after rough turning can be installed together for fine turning to ensure that the radial positioning surface of the measured part and the inner diameter of the graphite sliding bearing are concentric, so as to ensure the accuracy of the distance between the eccentric target and the inner hole of the positioning disc. .

[0024] In order to facilitate the control of the rotation angle of the eccentric target, the driving mechanism of the utility model adopts a stepper motor 7, the driving end of the stepper motor 7 is connected to the 3 rotating shafts of the eccentric target through a coupling 8, a support frame 9 is concentrically arranged below the mounting seat 4, and a space for installing the stepper motor 7 is formed inside the support frame 9.

[0025] In addition to the displacement detection accuracy performance, when the displacement sensor is specifically applied to the field of magnetic bearings, other performance of the sensor, such as the corresponding speed, must also meet the requirements. In order to test other performance simultaneously during the test, the displacement sensor 1 and the stepper motor 7 of the utility model are electrically connected to the electric control box. The electric control box is provided with a magnetic bearing main control board for receiving the displacement sensor detection data, and a stepper motor controller for controlling the rotation of the stepper motor; the test device is also provided with a display screen for displaying the test results.

[0026] The displacement signal detected by the displacement sensor is converted into a sampleable electrical signal so as to be transmitted to the magnetic bearing main control board, and other performances of the displacement sensor are analyzed and tested through the magnetic bearing main control board; the test device of the utility model has a high degree of automation, and in large-scale tests, the test results are less affected by human factors and are more accurate, the test conditions are increased, more moving distances are provided, and the amount of test data is increased, so that the displacement sensor can be fully tested and the test efficiency is improved.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A magnetic bearing radial displacement sensor testing device, characterized in that: The invention comprises a positioning plate (2) for positioning and fixing a displacement sensor (1), wherein the positioning plate (2) adopts a hollow structure, the displacement sensor (1) is located on an inner hole at the center of the positioning plate (2), an eccentric target (3) and a driving mechanism for driving the eccentric target (3) to rotate are arranged at the center of the positioning plate (2), the eccentric target (3) is driven to rotate by the driving mechanism, the displacement sensor (1) on the positioning plate (2) detects a change in the distance between the displacement sensor (1) and the side of the eccentric target (3), and the performance of the displacement sensor (1) is tested.

2. A magnetic bearing radial displacement sensor testing device according to claim 1, characterized in that: The positioning disc (2) and the eccentric target (3) are both arranged on a mounting seat (4); the mounting seat (4) is provided with a stepped countersunk hole (5) for cooperating with the positioning disc (2) and the eccentric target (3); the eccentric target (3) and the stepped countersunk hole (5) are matched via a graphite sliding bearing (6).

3. A magnetic bearing radial displacement sensor testing device according to claim 2, characterized in that: The driving mechanism adopts a stepping motor (7), and the driving end of the stepping motor (7) is connected to the rotating shaft of the eccentric target (3) via a coupling (8).

4. A magnetic bearing radial displacement sensor testing device according to claim 3, characterized in that: A support frame (9) is coaxially arranged below the mounting seat (4), and a space for mounting the stepping motor (7) is formed inside the support frame (9).

5. A magnetic bearing radial displacement sensor testing device according to claim 3, characterized in that: The displacement sensor (1) and the stepper motor (7) are both electrically connected to an electric control box, and a magnetic bearing main control board for receiving detection data of the displacement sensor and a stepper motor controller for controlling the rotation of the stepper motor are arranged in the electric control box.

6. A magnetic bearing radial displacement sensor testing device according to claim 1, characterized in that: The testing device is also provided with a display screen for displaying the test results.

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