Calibration platform for magnetic bearing control system

Abstract

The utility model discloses a calibration platform for a magnetic bearing control system, which relates to the technical field of magnetic bearing control systems, and comprises an operation table, an eddy current sensor, a servo motor, a nut sliding table and a displacement sensor, a test cover body is arranged right above the operation table, and the inner end of the test cover body is connected with a box door through a hinge; a testing mechanism is arranged in the testing cover body, the testing mechanism accurately obtains displacement data by measuring an eddy current effect generated by an alternating magnetic field on the surface of the metal rotor through an eddy current sensor arranged in the testing mechanism, a displacement mechanism is arranged on one side of the testing mechanism, and the displacement mechanism is arranged on the other side of the testing mechanism through a movable electromagnet block. The magnetic field intensity of the electromagnet is controlled by changing the current. The two-way lead screw drives the two sets of nut sliding tables to move, the nut sliding tables are used for driving the electromagnets to move in the axial direction, micron-order positioning precision is achieved, comparison calibration can be conveniently conducted through the two sets of rotors of the same size, and the calibration accuracy is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of magnetic bearing control systems, and specifically to a calibration platform for magnetic bearing control systems. Background Technology

[0002] The calibration platform for a magnetic bearing control system is a specialized device used to calibrate and test key parameters of the magnetic bearing control system, such as sensor accuracy, electromagnetic force characteristics, and control algorithms. Its core purpose is to ensure stable system performance and precise control.

[0003] Most existing testing stations may have the following drawbacks: some testing stations still use mechanical contact measurement, such as dial indicators, which are easily affected by wear and contamination of the rotor; traditional testing stations require manual operation of sensor adjustment and data recording, which is inefficient and prone to human error; and some testing stations are only designed for rotors of specific specifications and cannot quickly switch between testing different sizes or types of rotors. Utility Model Content

[0004] The purpose of this invention is to provide a calibration platform for a magnetic bearing control system to solve the above-mentioned defects caused by the prior art.

[0005] A calibration platform for a magnetic bearing control system includes an operating table, an eddy current sensor, a servo motor, a nut slide, and a displacement sensor. A test enclosure is positioned directly above the operating table, with a door hinged to the inner end of the test enclosure. A test mechanism is located inside the test enclosure. The test mechanism uses the internally installed eddy current sensor to measure the eddy current effect generated on the surface of a metal rotor by an alternating magnetic field, accurately acquiring displacement data. A displacement mechanism is located on one side of the test mechanism. The displacement mechanism uses a movable electromagnet block, and by changing the current, controls the magnetic field strength of the electromagnet block to generate attractive or repulsive forces on the rotor, simulating interference conditions. Stator supports are symmetrically connected to the inner end of the test enclosure.

[0006] Preferably, the testing mechanism includes an eddy current sensor, a test housing, a side bracket, a slot, a slider, a displacement sensor, and a guide rail. The eddy current sensor is installed through the outside of the test housing. A nut slide is provided directly below the eddy current sensor. A side bracket is provided on one side of the nut slide. A slot is provided on one side of the side bracket. A guide rail is connected to the outside of the side bracket. A slider is connected to the outside of the guide rail. A displacement sensor is connected through the outside of the slider. The side bracket and the guide rail are symmetrically arranged inside the test housing.

[0007] Preferably, the guide rail is connected to one side of the displacement sensor via a slider connected to the outside, and the displacement sensor is arranged parallel to the stator support.

[0008] Preferably, the displacement mechanism includes a servo motor, a nut slide, a slide rail, a bidirectional lead screw, and an electromagnet block. The servo motor is installed on one side of the test cover, and the output end of the servo motor is connected to the bidirectional lead screw. The bidirectional lead screw is located inside the slide rail, and the nut slide is connected inside the slide rail. An electromagnet block is located directly above the nut slide, and the slide rail is installed directly above the operating table.

[0009] Preferably, the output end of the servo motor is connected to one side of a bidirectional lead screw via a coupling and then to the inner end of a nut slide, wherein the nut slide is arranged parallel to the stator support.

[0010] Preferably, the nut slide is connected to the side bracket via a slot on one side.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. A stepper motor drives a bidirectional lead screw to rotate, which in turn drives two sets of nut slides to move. The nut slides then drive an electromagnet to move axially, achieving micron-level positioning accuracy. This facilitates comparison and calibration using two sets of rotors of the same size, improving calibration accuracy. DC or AC electromagnets are used, and the magnetic field strength is controlled by changing the current to generate attractive or repulsive forces on the rotor, simulating interference conditions.

[0013] 2. Connect the slider to the slide rail at the bottom of the guide rail, and connect the slider to the columnar displacement sensor. Quickly adjust the initial distance between the displacement sensor and the rotor to ensure that the sensor is near the rotor measurement area. Change rotors of different diameters and lengths, quickly switch the measurement position by sliding the guide rail slider, and collect multiple sets of data by moving the sensor with the slider to plot the displacement rotor position curve. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure of the test cover in this utility model.

[0016] Figure 3 This is a front view schematic diagram of the displacement mechanism in this utility model.

[0017] Figure 4 This is a side view of the displacement mechanism in this utility model.

[0018] Figure 5 This is a front view structural diagram of the test cover in this utility model.

[0019] in:

[0020] 1. Operating platform; 2. Eddy current sensor; 3. Test enclosure; 4. Servo motor; 5. Box door; 6. Test mechanism; 7. Side bracket; 8. Slot; 9. Nut slide; 10. Slide rail; 11. Bidirectional lead screw; 12. Electromagnet block; 13. Slider; 14. Displacement mechanism; 15. Displacement sensor; 16. Guide rail; 17. Stator bracket. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 5 As shown, a calibration platform for a magnetic bearing control system includes an operating table 1, an eddy current sensor 2, a servo motor 4, a nut slide 9, and a displacement sensor 15. A test cover 3 is arranged directly above the operating table 1. A door 5 is hinged to the inner end of the test cover 3. A test mechanism 6 is arranged inside the test cover 3. The test mechanism 6 accurately obtains displacement data by measuring the eddy current effect generated on the surface of the metal rotor by the eddy current sensor 2 installed inside. A displacement mechanism 14 is arranged on one side of the test mechanism 6. The displacement mechanism 14 uses a movable electromagnet block 12 to control the magnetic field strength of the electromagnet block 12 by changing the current, thereby generating an attractive or repulsive force on the rotor to simulate interference conditions. A stator support 17 is symmetrically connected to the inner end of the test cover 3.

[0023] In this embodiment, the testing mechanism 6 includes an eddy current sensor 2, a testing housing 3, a side bracket 7, a slot 8, a slider 13, a displacement sensor 15, and a guide rail 16. The eddy current sensor 2 is installed through the outside of the testing housing 3. A nut slide 9 is provided directly below the eddy current sensor 2. A side bracket 7 is provided on one side of the nut slide 9. A slot 8 is provided on one side of the side bracket 7. The guide rail 16 is connected to the outside of the side bracket 7. The slider 13 is connected to the outside of the guide rail 16. The displacement sensor 15 is connected through the outside of the slider 13. The side bracket 7 and the guide rail 16 are symmetrically arranged inside the testing housing 3. The two sets of rotors are synchronously detected through the side bracket 7 and the guide rail 16, thereby ensuring that the rotor error is within a reasonable range.

[0024] In this embodiment, the guide rail 16 is connected to one side of the displacement sensor 15 via the slider 13 connected to the outside. The displacement sensor 15 is arranged parallel to the stator support 17, and the displacement distance of the rotor is sensed by the displacement sensor 15.

[0025] In this embodiment, the displacement mechanism 14 includes a servo motor 4, a nut slide 9, a slide rail 10, a bidirectional lead screw 11, and an electromagnet block 12. The servo motor 4 is installed on one side of the test cover 3. The output end of the servo motor 4 is connected to the bidirectional lead screw 11. The bidirectional lead screw 11 is located inside the slide rail 10. The nut slide 9 is connected inside the slide rail 10. The electromagnet block 12 is located directly above the nut slide 9. The slide rail 10 is installed directly above the operating table 1.

[0026] In this embodiment, the output end of the servo motor 4 is connected to one side of the bidirectional lead screw 11 via a coupling and to the inner end of the nut slide 9. The nut slide 9 is arranged parallel to the stator bracket 17. The nut slide 9 drives the electromagnet block 12 to move, and the nut slide 9 and the side bracket 7 are used to adjust the displacement.

[0027] In this embodiment, the nut slide 9 and the side bracket 7 are connected by a slot 8 on one side of the side bracket 7. The slot 8 on one side of the side bracket 7 engages with one side of the nut slide 9, thereby allowing the installation position of the side bracket 7 to be adjusted according to usage requirements.

[0028] In practical applications, the calibration platform for this magnetic bearing control system includes the following tasks:

[0029] Step 1: The operator places the rotor directly on the top of the operating table 1, so that the test cover 3 covers the outside of the rotor to prevent external magnetic forces or other interference sources from affecting the rotor. By controlling the electromagnet block 12 to generate a known force, the rotor is moved to the preset position. The deviation between the output of the eddy current sensor 2 or the displacement sensor 15 and the actual displacement is compared to complete the linear fitting. A unidirectional electromagnetic force is applied to move the rotor to the maximum displacement. The side bracket 7 is engaged with one side of the nut slide table 9 through the slot 8 set on the outside, thereby adjusting the installation position of the side bracket 7.

[0030] Step 2: Initially, the stator electromagnet is energized to generate a magnetic field, which interacts with the rotor permanent magnet or electromagnet, bringing the rotor to the center position. At this time, the electromagnetic force is balanced with the rotor's gravity. Eddy current sensor 2 and displacement sensor 15 monitor in real time: when the rotor deviates from the equilibrium position due to external force, eddy current sensor 2 detects the rotor displacement non-contactly, such as the rotor's axial or radial offset, and converts the displacement signal into an electrical signal.

[0031] Step 3: Turn on the electromagnet block 12. When the servo motor 4 drives the bidirectional lead screw 11 to rotate, the nut slide 9 on the bidirectional lead screw 11 is displaced, so that the nut slide 9 is displaced outside the slide rail 10. The electromagnet block 12 interferes with the rotor set above. The eddy current sensor 2 accurately obtains the displacement data by measuring the eddy current effect generated on the surface of the metal rotor by the alternating magnetic field.

[0032] Step 4: During the test, the stator is positioned on the outside of the stator using the stator bracket 17, so that the stator is fixed inside the test housing 3. The test housing 3 is symmetrically installed with the stator. At the same time, according to the specifications of the rotor and stator, the slider 13 on the outside of the guide rail 16 is used for vertical displacement to quickly adjust the initial distance between the displacement sensor 15 and the rotor, ensuring that the displacement sensor 15 is near the rotor measurement area until the sensor output signal is stable. The slider 13 and the guide rail 16 are then positioned and locked with bolts.

[0033] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A calibration platform for a magnetic bearing control system, characterized in that: The test cover includes an operating table (1), an eddy current sensor (2), a servo motor (4), a nut slide (9), and a displacement sensor (15). A test cover (3) is set directly above the operating table (1). The inner end of the test cover (3) is hinged to a door (5). A test mechanism (6) is set inside the test cover (3). The test mechanism (6) accurately obtains displacement data by measuring the eddy current effect generated on the surface of the metal rotor by the eddy current sensor (2) set inside. A displacement mechanism (14) is set on one side of the test mechanism (6). The displacement mechanism (14) controls the magnetic field strength of the electromagnet block (12) by changing the current through a movable electromagnet block (12), thereby generating an attractive or repulsive force on the rotor to simulate interference conditions. A stator support (17) is symmetrically connected to the inner end of the test cover (3).

2. The calibration platform for a magnetic bearing control system according to claim 1, characterized in that: The testing mechanism (6) includes an eddy current sensor (2), a test housing (3), a side bracket (7), a slot (8), a slider (13), a displacement sensor (15), and a guide rail (16). The eddy current sensor (2) is installed through the outside of the test housing (3). A nut slide (9) is provided directly below the eddy current sensor (2). A side bracket (7) is provided on one side of the nut slide (9). A slot (8) is provided on one side of the side bracket (7). A guide rail (16) is connected to the outside of the side bracket (7). A slider (13) is connected to the outside of the guide rail (16). A displacement sensor (15) is connected through the outside of the slider (13). The side bracket (7) and the guide rail (16) are symmetrically arranged inside the test housing (3).

3. The calibration platform for a magnetic bearing control system according to claim 2, characterized in that: The guide rail (16) is connected to one side of the displacement sensor (15) via the slider (13) connected to the outside. The displacement sensor (15) is arranged parallel to the stator bracket (17).

4. The calibration platform for a magnetic bearing control system according to claim 1, characterized in that: The displacement mechanism (14) includes a servo motor (4), a nut slide (9), a slide rail (10), a two-way lead screw (11), and an electromagnet block (12). The servo motor (4) is installed on one side of the test cover (3). The output end of the servo motor (4) is connected to the two-way lead screw (11). The two-way lead screw (11) is located inside the slide rail (10). The nut slide (9) is connected inside the slide rail (10). An electromagnet block (12) is located directly above the nut slide (9). The slide rail (10) is installed directly above the operating table (1).

5. The calibration platform for a magnetic bearing control system according to claim 4, characterized in that: The output end of the servo motor (4) is connected to one side of the bidirectional lead screw (11) via a coupling and to the inner end of the nut slide (9). The nut slide (9) is arranged parallel to the stator bracket (17).

6. The calibration platform for a magnetic bearing control system according to claim 5, characterized in that: The nut slide (9) is connected to the side bracket (7) through a slot (8) on one side.

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