Rotor rotation direction identification device and method based on magnetic suspension bearing system

Abstract

The invention relates to the technical field of magnetic suspension bearings, and discloses a rotor rotation direction recognition device and method based on a magnetic suspension bearing system.The rotor rotation direction recognition device based on the magnetic suspension bearing system comprises a rotor body, a driving unit, an axial positioning unit, a radial positioning unit and a displacement monitoring unit; the displacement monitoring unit comprises an annular mounting plate mounted in the radial positioning unit, a substrate is fixedly connected to the annular mounting plate, a plurality of rotation direction monitoring sensors are mounted on the substrate, and the permanent magnet I is matched with the plurality of rotation direction monitoring sensors to monitor the rotation direction of the rotor main body. According to the rotor rotation direction recognition device based on the magnetic suspension bearing system, a permanent magnet I interacts with a plurality of rotation direction monitoring sensors in sequence when rotating along with a rotor main body, so that signal values output by the rotation direction monitoring sensors are changed, and the rotation direction of the rotor main body is judged through a rotation direction judgment module in a controller.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic bearings, and in particular to a device and method for identifying the rotation direction of a rotor in a magnetic bearing system. Background Art

[0002] Magnetic bearings are a new type of bearing that uses electromagnetic force to achieve contactless operation. They are often used in situations where the rotor speed is high. At present, magnetic bearing control systems basically adopt a control strategy based on rotor position error, that is, a displacement sensor is used to detect the real-time vibration displacement of the rotor, and the displacement error is obtained by comparing it with the reference displacement. The controller, power amplifier, and magnetic bearing stator then generate corresponding electromagnetic force to eliminate the displacement error.

[0003] In the current control strategy, when the inverter drives the motor to start rotating, the magnetic bearing only supports the rotor. In actual applications, the rotor is connected to the pneumatic impeller, and the pneumatic impeller must have the correct rotation direction to work properly. Currently, the inverter is usually tested at a low speed, and the human eye is used to judge whether the motor's rotation direction is correct. However, for some compressor usage occasions, especially those with closed working fluids, such as refrigeration compressors, expanders, etc., it is impossible to open the pneumatic end to determine the rotation direction of the impeller, which brings certain risks to the reliability of the system.

[0004] The above problems exist mainly because the position error control strategy of the traditional magnetic bearing system does not have the ability to judge the rotor rotation direction. Therefore, we propose a device and method for identifying the rotor rotation direction in a magnetic bearing system. Summary of the invention

[0005] In view of the problem that the position error control strategy of the conventional magnetic bearing system mentioned above is not capable of determining the rotation direction of the rotor, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to provide a device for identifying the rotation direction of a rotor in a magnetic bearing system, which aims to solve the problem that the position error control strategy of the traditional magnetic bearing system does not have the ability to judge the rotation direction of the rotor.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a device for identifying the rotation direction of a rotor in a magnetic bearing system, comprising a rotor body, a drive unit, an axial positioning unit, a radial positioning unit and a displacement monitoring unit, wherein the drive unit, the axial positioning unit and the radial positioning unit are all sleeved on the rotor body, and the rotor body is driven by the drive unit to rotate with the central axis of the radial positioning unit as the center, and the axial positioning unit is used to axially position the rotor body, and the displacement monitoring unit comprises an annular mounting plate installed in the radial positioning unit, a substrate is fixedly connected to the annular mounting plate, and a plurality of rotation direction monitoring sensors are installed on the substrate in an annular manner with equal intervals, and the number of the rotation direction monitoring sensors is four, and the rotor body is located inside the radial positioning unit and is connected to a permanent magnet 1, and the permanent magnet 1 cooperates with the plurality of rotation direction monitoring sensors to monitor the direction of the rotor body.

[0008] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system of the present invention, wherein: the driving unit includes a shell, and the stator winding is fixedly installed in the shell.

[0009] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system described in the present invention, the axial positioning unit includes an axial positioning ring fixedly connected to the shell, and installation cavities are provided on both sides of the axial positioning ring, and annular coils are installed in the installation cavity, and the push plate of the rotor body is arranged between the two groups of annular coils.

[0010] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system described in the present invention, the radial positioning unit includes a radial positioning ring, a plurality of protrusions are fixedly connected to the inner side of the radial positioning ring in a ring shape with equal spacing, an excitation winding is spirally wound on the protrusion, a cover plate is fixedly connected to one side of the radial positioning ring, a bearing guard ring is coaxially fixedly connected to the cover plate, and the bearing guard ring is used to limit the rotor body.

[0011] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system of the present invention, wherein: the radial positioning units are divided into two groups, and the two radial positioning rings are respectively connected and fixed to the housing and the axial positioning ring.

[0012] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system described in the present invention, the rotation direction monitoring sensor is a Hall sensor, and a radial / axial displacement sensor installed on the substrate is provided between two adjacent rotation direction monitoring sensors.

[0013] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system described in the present invention, wherein: a fixed component connected to the rotor body is provided on the inner side of the displacement monitoring unit, the fixed component includes a fixed ring, the inner sliding connection has two rotating rings, a plurality of clamping plates are provided in the fixed ring, and both ends of the clamping plates are respectively hinged to the two rotating rings through connecting rods.

[0014] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system described in the present invention, wherein: the fixed ring includes two annular plates, a plurality of arc plates are fixedly connected to the annular plates, the permanent magnet one is fixedly installed on the holder one, and the holder one is engaged with the arc plates.

[0015] As a preferred solution of the rotor rotation direction identification device based on the magnetic bearing system described in the present invention, wherein: the fixed ring is provided with an adjustment component on the side relative to the permanent magnet one, and the adjustment component includes a base two that is clamped with the fixed ring, and a bidirectional screw is rotatably connected to the base two, and both ends of the bidirectional screw are threadedly engaged with threaded sleeves, and a driving rod is slidably connected to one side of the threaded sleeve, and the two driving rods are respectively connected and fixed to the two rotating rings.

[0016] To achieve the above object, the present invention provides the following technical solution: a method for identifying the rotation direction of a rotor in a magnetic bearing system, comprising the following steps:

[0017] S1. Add a rotor rotation direction judgment module to the magnetic bearing controller, and the module interacts with the rotation direction monitoring sensor;

[0018] S2. Add a control algorithm in the judgment module: establish four displacement arrays, which are used to store displacement signals of four radial degrees of freedom, respectively, where X1 and Y1 are radial displacements in the x-axis and y-axis directions on the left, and X2 and Y2 are radial displacement signals in the x-axis and y-axis directions on the right;

[0019] S3, after reaching the rotation direction judgment speed, the magnetic bearing controller collects the radial four-degree-of-freedom displacement signals of the rotor body through the rotation direction monitoring sensor, and stores the displacement signals in the displacement array;

[0020] S4. Since various interference signals are usually superimposed on the collected displacement signals, adaptive recognition is performed on the collected signals, and signals with the same rotation frequency are extracted to cover the original array;

[0021] S5. Mark the four quadrants formed by the x-axis and the y-axis as "1", "2", "3", and "4" in sequence, and perform quadrant judgment based on the X1 and Y1 signals: if X1 is greater than 0 and Y1 is greater than 0, the result is "1"; if X1 is less than 0 and Y1 is greater than 0, the result is "2"; if X1 is greater than 0 and Y1 is less than 0, the result is "3"; if X1 is greater than 0 and Y1 is less than 0, the result is "4" and stored in array XY1. Similarly, perform quadrant judgment based on X2 and Y2 signals and store in array XY2.

[0022] S6. Scan and judge the arrays XY1 and XY2 respectively to determine the order of quadrant change. The judgment principle is as follows: if it changes according to 1-2-3-4, it is counterclockwise, and if it changes according to 4-3-2-1, it is clockwise. According to the results of the rotation direction judgment based on multiple sets of data, if more than 80% of the results are close to a certain rotation direction, the rotation direction of the rotor body is finally determined, otherwise it enters the next round of identification.

[0023] Beneficial effects of the present invention:

[0024] 1. The present invention uses a permanent magnet to interact with multiple rotation direction monitoring sensors in sequence when rotating with the rotor body, so that the output signal value of the rotation direction monitoring sensor changes, and transmits the signal to the controller through the substrate, and the rotation direction of the rotor body is judged by the rotation direction judgment module in the controller.

[0025] 2. The present invention enables each clamping block to shrink or expand synchronously when two rotating rings rotate in opposite directions and at the same angle, and can be adjusted and adapted according to the sizes of different rotor bodies, and can be stably and effectively connected, thereby improving the convenience and versatility of the fixing components during the assembly process.

[0026] 3. In the present invention, a permanent magnet 1 and an adjustment component are respectively arranged at two ends of a diameter of a fixed ring. The sum of the weights of the permanent magnet 1 and the holder 1 is the same as the weight of the adjustment component, thereby performing a weight balance ratio on the two ends of the fixed ring, making the drill body more stable when rotating and avoiding displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0028] in:

[0029] Figure 1 It is a schematic diagram of the overall structure of the rotor rotation direction identification device in the magnetic suspension bearing system of the present invention.

[0030] Figure 2 It is a partial structural anatomical schematic diagram of the rotor rotation direction identification device in the magnetic bearing system of the present invention.

[0031] Figure 3 The present invention is a schematic structural anatomy diagram of an axial positioning unit of a rotor rotation direction identification device in a magnetic bearing system.

[0032] Figure 4 It is a schematic diagram of the disassembly of the radial positioning unit and the displacement monitoring unit structure of the rotor rotation direction identification device in the magnetic bearing system according to the present invention.

[0033] Figure 5 It is a schematic diagram of the structure of the fixed components of the rotor rotation direction identification device in the magnetic bearing system according to the present invention.

[0034] Figure 6 The present invention is a schematic diagram of the structure of a rotating ring and a clamping block in a rotor rotation direction identification device in a magnetic bearing system.

[0035] Figure 7 It is a schematic diagram of the structural disassembly of a fixing ring and a clamping seat of a rotor rotation direction identification device in a magnetic bearing system according to the present invention.

[0036] Figure 8 The invention is based on the rotor rotation direction identification device in the magnetic suspension bearing system Figure 5 A is an enlarged schematic diagram of the structure.

[0037] Fig. 9 The present invention is a flow chart of a method for identifying the rotation direction of a rotor in a magnetic bearing system.

[0038] Description of reference numerals:

[0039] 1. Rotor body; 101. Push plate; 2. Drive unit; 201. Shell; 202. Stator winding; 3. Axial positioning unit; 301. Axial positioning ring; 302. Mounting cavity; 303. Ring coil; 4. Radial positioning unit; 401. Radial positioning ring; 402. Protrusion; 403. Excitation winding; 404. Cover plate; 405. Bearing retainer; 5. Displacement monitoring unit; 501. Ring mounting plate; 502. Base plate; 503. Rotation direction monitoring sensor; 504. Radial / axial displacement sensor; 6. Permanent magnet 1; 601. Card seat 1; 7. Fixing assembly; 701. Fixing ring; 7011. Ring plate; 7012. Arc plate; 702. Rotating ring; 703. Clamping plate; 704. Connecting rod; 8. Adjusting assembly; 801. Card seat 2; 802. Bidirectional screw; 803. Screw sleeve; 804. Driving rod. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Example 1

[0043] Reference Figure 1-7 , which is the first embodiment of the present invention, provides a device for identifying the rotation direction of a rotor in a magnetic bearing system, the device for identifying the rotation direction of a rotor in a magnetic bearing system comprises a rotor body 1, a driving unit 2, an axial positioning unit 3, a radial positioning unit 4 and a displacement monitoring unit 5;

[0044] The driving unit 2 , the axial positioning unit 3 , and the radial positioning unit 4 are all sleeved on the rotor body 1 . The rotor body 1 is driven by the driving unit 2 to rotate around the central axis of the radial positioning unit 4 . The axial positioning unit 3 is used to axially position the rotor body 1 .

[0045] In the above technical scheme, the drive unit 2 is electrically connected to the frequency converter of the magnetic bearing, and the axial positioning unit 3 and the radial positioning unit 4 are electrically connected to the controller of the magnetic bearing. When the axial positioning unit 3 and the radial positioning unit 4 are energized, a magnetic field is generated, and the magnetic field force acts on the rotor body 1, so that the rotor body 1 is suspended. The axis of the rotor body 1 coincides with the axis of the axial positioning unit 3 and the radial positioning unit 4. When the drive unit 2 is energized, it can drive the rotor body 1 to rotate.

[0046] The displacement monitoring unit 5 includes an annular mounting plate 501 installed in the radial positioning unit 4, and a base plate 502 is fixedly connected to the annular mounting plate 501. A plurality of rotation direction monitoring sensors 503 are installed on the base plate 502 in a circular shape with equal intervals. There are four rotation direction monitoring sensors 503. The rotor body 1 is located inside the radial positioning unit 4 and is connected to a permanent magnet 6. The permanent magnet 6 cooperates with the plurality of rotation direction monitoring sensors 503 to monitor the direction of rotation of the rotor body 1.

[0047] In the above technical scheme, the annular mounting plate 501 is installed on the inner wall of the radial positioning unit 4, the substrate 502 is electrically connected to the controller of the magnetic bearing, and interacts with the rotation direction monitoring sensor 503. When the rotor body 1 rotates, it drives the permanent magnet 6 to rotate synchronously. When the permanent magnet 6 approaches the corresponding rotation direction monitoring sensor 503, the rotation direction monitoring sensor 503 generates a signal change and transmits it to the controller through the substrate 502.

[0048] The driving unit 2 includes a housing 201 , in which a stator winding 202 is fixedly installed. When current passes through the stator winding 202 , a rotating magnetic field is generated, and the rotor body 1 is driven to rotate under the action of the magnetic field, thereby converting electrical energy into mechanical energy.

[0049] The axial positioning unit 3 includes an axial positioning ring 301 fixedly connected to the shell 201, and installation cavities 302 are provided on both sides of the axial positioning ring 301. An annular coil 303 is installed in the installation cavity 302. The push plate 101 of the rotor body 1 is arranged between the two groups of annular coils 303. The annular coil 303 generates a magnetic field after being energized, and the magnetic field generated by the two groups of annular coils 303 applies forces of equal magnitude and opposite directions to the push plate 101, so that the push plate 101 drives the rotor body 1 to remain suspended in the axial direction.

[0050] The radial positioning unit 4 includes a radial positioning ring 401, and a plurality of protrusions 402 are fixedly connected in a circular shape with equal intervals on the inner side of the radial positioning ring 401. An excitation winding 403 is spirally wound on the protrusion 402. The number of the protrusions 402 is an even number. A permanent magnet 2 is arranged in the protrusion 402, and the magnetization direction of the permanent magnet 2 is in the same direction as the magnetic field direction of the excitation winding 403. When all or more of the excitation windings 403 are energized, a magnetic field is generated, and acts on the rotor body 1 to enable it to be suspended in the radial direction.

[0051] A cover plate 404 is fixedly connected to one side of the radial positioning ring 401, and a bearing retainer 405 is coaxially fixedly connected to the cover plate 404. The bearing retainer 405 is used to limit the rotor body 1. It can be understood that the cover plate 404 and one end of the radial positioning ring 401 are sleeve-fitted, and the circumferential side of the cover plate 404 can be connected and fixed to the radial positioning ring 401 by screws. The detachable design of the cover plate 404 and the radial positioning ring 401 facilitates disassembly and assembly during subsequent maintenance and repair.

[0052] The radial positioning units 4 are divided into two groups, and the two radial positioning rings 401 are respectively connected and fixed to the shell 201 and the axial positioning ring 301. In the actual working process, the two radial positioning units 4 are respectively arranged at the two ends of the rotor body 1, so as to increase the radial suspension effect on the rotor body 1 and make the rotor body 1 more stable when radially suspended.

[0053] The rotation direction monitoring sensor 503 is a Hall sensor, and a radial / axial displacement sensor 504 installed on the substrate 502 is provided between two adjacent rotation direction monitoring sensors 503. Under working conditions, each Hall sensor always outputs a constant voltage value. When the permanent magnet 6 approaches a Hall sensor, the output voltage value of the Hall sensor changes. The position of the Hall sensor on the substrate 502 and the change of the output voltage value of each Hall sensor are determined by transmitting it to the controller of the magnetic bearing, thereby determining the rotation direction of the rotor body 1.

[0054] It can be understood that the radial / axial displacement sensor 504 interacts with the substrate 502, and the radial / axial displacement sensor 504 monitors the radial and axial displacements of the rotating rotor body 1, and transmits the displacement signal to the controller of the magnetic bearing. The controller of the magnetic bearing adjusts the magnetic field change of the axial positioning unit 3 or the radial positioning unit 4 according to the position change of the rotor body 1, so that the axis center of the rotor body 1 remains on the axis center of the radial positioning unit 4.

[0055] During use, the magnetic bearing controller controls the annular coil 303 and the excitation winding 403 to connect currents of corresponding magnitude and direction respectively. After the two groups of annular coils 303 are energized, a magnetic field is generated. The two groups of annular coils 303 apply forces of equal magnitude and opposite directions to the push plate 101, so that the push plate 101 drives the rotor body 1 to remain suspended in the axial direction. After multiple or all of the excitation windings 403 are energized, a magnetic field is generated, so that the rotor body 1 remains suspended in the radial direction. After the magnetic bearing inverter controls the stator winding 202 to generate a rotating magnetic field, the magnetic field acts on the rotor body 1 to rotate the rotor body 1, and the radial / axial displacement sensor 504 performs radial and Axial displacement monitoring, the substrate 502 transmits the displacement signal to the controller of the magnetic bearing. The controller of the magnetic bearing adjusts the magnetic field change of the axial annular coil 303 or the excitation winding 403 according to the position change of the rotor body 1, so that the axis of the rotor body 1 is maintained on the axis of the radial positioning unit 4. At the same time, each rotation direction monitoring sensor 503 maintains a constant output voltage value. When the permanent magnet 6 is close to a certain rotation direction monitoring sensor 503, the output voltage value of the rotation direction monitoring sensor 503 changes. The substrate 502 transmits the signal change of each rotation direction monitoring sensor 503 to the magnetic bearing controller, and the rotation direction of the rotor body 1 is determined by the rotation direction control signal in the controller.

[0056] Example 2

[0057] Reference Figure 5-7, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that a fixing assembly 7 connected to the rotor body 1 is provided on the inner side of the displacement monitoring unit 5, and the fixing assembly 7 includes a fixing ring 701, which is slidably connected to two rotating rings 702. A plurality of clamping plates 703 are provided in the fixing ring 701, and both ends of the clamping plates 703 are respectively hinged to the two rotating rings 702 through connecting rods 704.

[0058] In the above technical solution, the rotating ring 702 can rotate inside the fixed ring 701, and the two rotating rings 702 are coaxially arranged. When the two rotating rings 702 rotate at the same angle and in opposite directions, they can cooperate with the connecting rod 704 to drive the clamping plate 703 to move. The multiple clamping plates 703 can shrink or expand synchronously, so that the multiple clamping plates 703 can be adjusted and adapted according to the size of the rotor body 1, and the clamping plates 703 can be tightly abutted against the rotor body 1.

[0059] It can be understood that the clamping plate 703 has an arc-shaped concave surface on one side facing the rotor body 1 , and an anti-slip and heat-resistant material is fixed on the arc-shaped concave surface, so that the clamping plate 703 can be in close and stable contact with the rotor body 1 , thereby achieving a stable connection of the fixing mechanism 7 to the rotor body 1 .

[0060] The fixed ring 701 includes two annular plates 7011, and a plurality of arc plates 7012 are fixedly connected to the annular plates 7011. The permanent magnet 6 is fixedly installed on the holder 601, and the holder 601 is snap-fitted with the arc plates 7012. The plurality of arc plates 7012 are respectively fixed on the inner and outer sides of the annular plates 7011, and are arranged in a circular shape with equal intervals. Two adjacent arc plates 7012 cooperate to limit the rotating ring 702, so that the rotating ring 702 rotates around the center of the fixed ring 701.

[0061] After the holder 601 is engaged with two of the arc plates 7012 in axial contact, the fixing assembly 7 can drive the permanent magnet 6 to rotate synchronously with the rotation body 1, so that the permanent magnet 6 and each rotation direction monitoring sensor 503 cyclically exchange signals.

[0062] In actual work, a connecting seat is fixedly connected to the arc plate 7012 on the side close to the center of the annular plate 7011. The two arc plates 7011 are connected with screws through two axial connecting seats to form a fixing ring 701. The fixing ring 701 is detachable in design, which improves the convenience during production assembly and subsequent maintenance.

[0063] During use, after the fixing component 7 is inserted into the end of the rotor body 1, the fixing component 7 is overlapped with the displacement monitoring unit 5, and the two rotating rings 702 are rotated in opposite directions and at the same angle. The rotating ring 702 cooperates with the connecting rod 704 to enable the clamping block 703 to tightly contact the surface of the rotor body 1.

[0064] The remaining structures are the same as those of Example 1.

[0065] Example 3

[0066] Reference Figure 7-8 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: an adjustment component 8 is provided on one side of the fixed ring 701 relative to the permanent magnet 1 6, and the adjustment component 8 includes a second holder 801 engaged with the fixed ring 701, and a bidirectional screw 802 is rotatably connected to the second holder 801. Both ends of the bidirectional screw 802 are threadedly engaged with threaded sleeves 803, and a driving rod 804 is slidably connected to one side of the threaded sleeve 803. The two driving rods 804 are respectively connected and fixed to the two rotating rings 702.

[0067] In the above technical solution, when the bidirectional screw 802 is rotated, the two screw sleeves 803 move closer to or farther away from each other, and cooperate with the driving rod 804 to drive the two rotating rings 702 to rotate in opposite directions and at the same angle. At the same time, the cooperation between the bidirectional screw 802 and the screw sleeve 803 can prevent the rotating ring 702 from rotating at will.

[0068] A transmission rod is fixedly connected to one side of the screw sleeve 803, and a sliding hole matching the transmission rod is provided on the driving rod 804. When the screw sleeve 803 is displaced on the bidirectional screw rod 802, the transmission rod cooperates with the sliding hole to displace the driving rod 804.

[0069] Both ends of the bidirectional screw rod 802 are provided with driving grooves. After a driving tool such as a hexagonal wrench is plugged into the driving groove, the bidirectional screw rod 802 can be driven to rotate.

[0070] It can be understood that the adjustment component 8 and the seat 601 are respectively arranged at the two ends of a certain diameter of the fixed ring 701, and the weight of the adjustment component 8 is the same as the sum of the weights of the seat 601 and the permanent magnet 6, so that the weight of the fixed ring 701 can be balanced to make the rotor body 1 more stable when rotating and avoid shaking.

[0071] The remaining structure is the same as that of Example 2.

[0072] Example 4

[0073] Referring to the figure, a fourth embodiment of the present invention provides: a method for identifying the rotation direction of a rotor in a magnetic bearing system, comprising the following steps:

[0074] S1. Add a rotor rotation direction judgment module in the magnetic bearing controller, and the module interacts with the rotation direction monitoring sensor 503 by signal;

[0075] S2. Add a control algorithm in the judgment module: establish four displacement arrays, which are used to store displacement signals of four radial degrees of freedom, respectively, where X1 and Y1 are radial displacements in the x-axis and y-axis directions on the left, and X2 and Y2 are radial displacement signals in the x-axis and y-axis directions on the right;

[0076] S3, after reaching the rotation direction judgment speed, the magnetic bearing controller collects the radial four-degree-of-freedom displacement signals of the rotor body 1 through the rotation direction monitoring sensor 503, and stores the displacement signals in the displacement array;

[0077] S4. Since various interference signals are usually superimposed on the collected displacement signals, adaptive recognition is performed on the collected signals, and signals with the same rotation frequency are extracted to cover the original array;

[0078] S5. Mark the four quadrants formed by the x-axis and the y-axis as "1", "2", "3", and "4" in sequence, and perform quadrant judgment based on the X1 and Y1 signals: if X1 is greater than 0 and Y1 is greater than 0, the result is "1"; if X1 is less than 0 and Y1 is greater than 0, the result is "2"; if X1 is greater than 0 and Y1 is less than 0, the result is "3"; if X1 is greater than 0 and Y1 is less than 0, the result is "4" and stored in array XY1. Similarly, perform quadrant judgment based on X2 and Y2 signals and store in array XY2.

[0079] S6. Scan and judge the arrays XY1 and XY2 respectively to determine the order of quadrant change. The judgment principle is as follows: if it changes according to 1-2-3-4, it is counterclockwise, and if it changes according to 4-3-2-1, it is clockwise. According to the results of the rotation direction judgment based on multiple sets of data, if more than 80% of the results are close to a certain rotation direction, the rotation direction of the rotor body 1 is finally determined, otherwise it enters the next round of identification.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A device for identifying the rotation direction of a rotor in a magnetic bearing system, characterized in that: It comprises a rotor body (1), a drive unit (2), an axial positioning unit (3), a radial positioning unit (4) and a displacement monitoring unit (5); The driving unit (2), the axial positioning unit (3), and the radial positioning unit (4) are all sleeved on the rotor body (1); the rotor body (1) is driven by the driving unit (2) to rotate with the central axis of the radial positioning unit (4) as the center; and the axial positioning unit (3) is used to axially position the rotor body (1); The displacement monitoring unit (5) comprises an annular mounting plate (501) mounted in the radial positioning unit (4), a base plate (502) being fixedly connected to the annular mounting plate (501), a plurality of rotation direction monitoring sensors (503) being mounted in an annular manner and at equal intervals on the base plate (502), the number of the rotation direction monitoring sensors (503) being four, the rotor body (1) being located inside the radial positioning unit (4) and being connected to a permanent magnet one (6), the permanent magnet one (6) being used in conjunction with the plurality of rotation direction monitoring sensors (503) to monitor the rotation direction of the rotor body (1).

2. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 1 is characterized in that: The drive unit (2) comprises a housing (201), and a stator winding (202) is fixedly mounted in the housing (201).

3. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 2 is characterized in that: The axial positioning unit (3) comprises an axial positioning ring (301) connected and fixed to the housing (201), installation cavities (302) are provided on both sides of the axial positioning ring (301), an annular coil (303) is installed in the installation cavity (302), and the push plate (101) of the rotor body (1) is arranged between the two groups of annular coils (303).

4. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 1 is characterized in that: The radial positioning unit (4) comprises a radial positioning ring (401), a plurality of protrusions (402) are fixedly connected in an annular shape and at equal intervals on the inner side of the radial positioning ring (401), and an excitation winding (403) is spirally wound on the protrusion (402); A cover plate (404) is fixedly connected to one side of the radial positioning ring (401), and a bearing retainer (405) is coaxially fixedly connected to the cover plate (404), wherein the bearing retainer (405) is used to limit the position of the rotor body (1).

5. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 4 is characterized in that: The radial positioning units (4) are divided into two groups, and the two radial positioning rings (401) are respectively connected and fixed to the housing (201) and the axial positioning ring (301).

6. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 1 is characterized in that: The rotation direction monitoring sensor (503) is a Hall sensor, and a radial / axial displacement sensor (504) mounted on the substrate (502) is provided between two adjacent rotation direction monitoring sensors (503).

7. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 1 is characterized in that: A fixing assembly (7) connected to the rotor body (1) is provided on the inner side of the displacement monitoring unit (5), the fixing assembly (7) comprising a fixing ring (701), two rotating rings (702) being slidably connected thereto, a plurality of clamping plates (703) being provided inside the fixing ring (701), both ends of the clamping plates (703) being respectively hinged to the two rotating rings (702) via connecting rods (704).

8. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 7 is characterized in that: The fixing ring (701) comprises two annular plates (7011), and a plurality of arc-shaped plates (7012) are fixedly connected to the annular plates (7011). The permanent magnet one (6) is fixedly mounted on the clamping seat one (601), and the clamping seat one (601) is clamped and matched with the arc-shaped plates (7012).

9. The device for identifying the rotor rotation direction in a magnetic bearing system according to claim 8, characterized in that: The fixing ring (701) is provided with an adjustment component (8) on one side relative to the permanent magnet one (6), and the adjustment component (8) comprises a second clamping seat (801) engaged with the fixing ring (701), and a bidirectional screw rod (802) is rotatably connected to the second clamping seat (801), and both ends of the bidirectional screw rod (802) are threadedly engaged with a screw sleeve (803), and a driving rod (804) is slidably connected to one side of the screw sleeve (803), and the two driving rods (804) are respectively connected and fixed to the two rotating rings (702).

10. A method for identifying the rotation direction of a rotor in a magnetic bearing system, which is applied to the device for identifying the rotation direction of a rotor in a magnetic bearing system as claimed in claim 1, characterized in that: The following steps are included: S1. Adding a rotor rotation direction judgment module to the magnetic bearing controller, and the module performs signal interaction with the rotation direction monitoring sensor (503); S2. Add a control algorithm in the judgment module: establish four displacement arrays, which are used to store displacement signals of four radial degrees of freedom, respectively, where X1 and Y1 are radial displacements in the x-axis and y-axis directions on the left, and X2 and Y2 are radial displacement signals in the x-axis and y-axis directions on the right; S3, after reaching the rotation direction judgment speed, the magnetic bearing controller collects radial four-degree-of-freedom displacement signals of the rotor body (1) through the rotation direction monitoring sensor (503), and stores the displacement signals in a displacement array; S4. Since various interference signals are usually superimposed on the collected displacement signals, adaptive recognition is performed on the collected signals, and signals with the same rotation frequency are extracted to cover the original array; S5. Mark the four quadrants formed by the x-axis and the y-axis as "1", "2", "3", and "4" in sequence, and perform quadrant judgment based on the X1 and Y1 signals: if X1 is greater than 0 and Y1 is greater than 0, the result is "1"; if X1 is less than 0 and Y1 is greater than 0, the result is "2"; if X1 is greater than 0 and Y1 is less than 0, the result is "3"; if X1 is greater than 0 and Y1 is less than 0, the result is "4" and stored in array XY1. Similarly, perform quadrant judgment based on X2 and Y2 signals and store in array XY2. S6. Scan and judge the arrays XY1 and XY2 respectively to determine the order of quadrant change. The judgment principle is as follows: if the change is 1-2-3-4, it is counterclockwise; if the change is 4-3-2-1, it is clockwise. According to the results of the rotation direction judgment of multiple sets of data, if more than 80% of the results are close to a certain rotation direction, the rotation direction of the rotor body (1) is finally determined, otherwise it enters the next round of identification.

Images