Integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing

Abstract

The utility model provides an integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing. The integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing comprises a stator sleeve, a rotor core, a radial control winding, an axial control winding, a stator disc, an axial magnetic pole, a stator magnet yoke, a radial magnetic pole and a permanent magnet ring, according to the three-degree-of-freedom magnetic suspension bearing, when the load borne by the rotor core does not exceed the bearing capacity of the magnetic suspension bearing, the magnetic suspension bearing can generate axial and radial suspension forces with controllable sizes and directions, three-degree-of-freedom stable suspension of the rotor core is achieved, and compared with a traditional discrete three-degree-of-freedom magnetic suspension bearing, the size is smaller, the axial length is reduced by 50%, and the bearing capacity is improved. Compared with an electromagnetic bias magnetic suspension bearing, the power consumption of the permanent magnetic field for bearing the gravity of the flywheel is close to zero, and through the arrangement of the line arrangement mechanism, various wires can be bundled, fixed in the wire frame and guided out of the stator sleeve through the through groove, so that the wires can be arranged conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic suspension bearings, in particular to an integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing. Background Art

[0002] Magnetic bearings use magnetic force to suspend the rotor in the air, so that there is no mechanical contact between the rotor and the stator. The principle is that the magnetic induction line is perpendicular to the magnetic levitation line, and the shaft core is parallel to the magnetic levitation line, so the weight of the rotor is fixed on the running track, and the shaft core, which is almost unloaded, is supported in the direction opposite to the magnetic levitation line, so that the entire rotor is suspended in the air and on a fixed running track;

[0003] Traditional discrete three-degree-of-freedom magnetic bearings are large in size and have a long axial length. They consume high energy when bearing the flywheel gravity through a permanent magnetic field, resulting in high costs when used. In addition, since the windings need to be controlled by a power amplifier and the status needs to be monitored by sensors, many wires are required on the surface of the magnetic bearings, and existing magnetic bearings are not convenient for organizing these wires. Utility Model Content

[0004] The utility model aims to provide an integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing comprises a stator sleeve, a rotor core, a radial control winding, an axial control winding, a stator disc, an axial magnetic pole, a stator yoke, a radial magnetic pole and a permanent magnet ring, wherein the two stator discs are respectively fixed at the two ends of the stator sleeve, the rotor core is rotatably arranged between the two stator discs, the permanent magnet ring is embedded in the stator sleeve, the stator yoke is fixed to the surface of the permanent magnet ring, the radial magnetic pole is fixed to the surface of the stator yoke, the axial magnetic pole is fixed to the surface of the stator disc, the radial control winding is installed on the surface of the radial magnetic pole, the axial control winding is installed on the surface of the axial magnetic pole, four radial air gaps are arranged between the radial magnetic pole and the rotor core, two axial air gaps are arranged between the axial magnetic pole and the rotor core, and bias magnetic fields and axial control magnetic fields exist in the axial air gaps.

[0007] Preferably, a line tidying mechanism is provided on the surface of the stator sleeve, and the line tidying mechanism includes a wire rack and an ear seat, the ear seat is fixed to the surface of the stator sleeve, the surface of the ear seat is provided with a groove, the groove is connected to the stator sleeve through a through hole, the wire rack is installed on the surface of the stator sleeve, and the ear seat is arranged in the wire rack.

[0008] Preferably, the wire rack includes two identical annular shells and an adjustment seat, the surface of the adjustment seat is provided with a through groove, the interior of the annular shell is provided with a channel, the two annular shells are fixedly mounted on the surface of the stator sleeve through a connecting piece, the ear seat is engaged in the channel, the adjustment seat is slidably arranged between the two annular shells, and the through groove is connected to the stator sleeve through the channel and the cavity.

[0009] Preferably, a notch is provided on the surface of the annular shell, a sliding groove matching the inner wall of the notch is provided on the side of the adjustment seat, and the adjustment seat is slidably arranged in the two notches through the sliding groove.

[0010] Preferably, the connecting member includes a guide column, a connecting hole, a threaded hole and a bolt, the guide column is vertically fixed to the inside of the channel, the connecting hole is arranged through the surface of one of the annular shells, the threaded hole is arranged on the surface of the other annular shell and the end face of the guide column, and the bolt passes through the connecting hole and is threadedly connected in the threaded hole.

[0011] Preferably, the wire rack is made of insulating material, and both ends of the slide groove are arranged as arc structures.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] In the present invention, when the rotor core is subjected to a load that does not exceed the bearing capacity of the magnetic bearing, the magnetic bearing can generate axial and radial suspension forces with controllable size and direction, thereby realizing stable suspension of the rotor core in three degrees of freedom. Compared with the traditional discrete three-degree-of-freedom magnetic bearing, it is smaller in size, and its axial length is reduced by 50%, which increases the rated critical speed of the rotor. Compared with the kW-level energy consumption of the electromagnetic biased magnetic bearing, the energy consumption of using a permanent magnetic field to bear the flywheel gravity is close to zero. Moreover, through the setting of a line sorting mechanism, various wires can be gathered, fixed in the wire frame and guided to the outside of the stator sleeve through the through slot, so as to facilitate the sorting of the wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the main structure of the stator sleeve of the utility model;

[0017] Figure 4 It is a schematic diagram of the exploded structure of the wire rack of the utility model;

[0018] Figure 5 This is a schematic diagram of the connection between the adjustment plate and the annular housing of the utility model;

[0019] Figure 6 It is a schematic cross-sectional structure diagram of the stator sleeve of the utility model;

[0020] Figure 7 This is a schematic diagram of the magnetic suspension bearing control system of the utility model.

[0021] In the figure: 1. stator sleeve; 2. rotor core; 3. radial control winding; 4. axial control winding; 5. stator disk; 6. axial magnetic pole; 7. stator yoke; 8. radial magnetic pole; 9. permanent magnet ring; 10. bobbin; 11. ear seat; 12. groove; 13. through hole; 14. annular shell; 15. adjustment seat; 16. through slot; 17. channel; 18. notch; 19. slide groove; 20. guide column; 21. connecting hole; 22. threaded hole; 23. bolt. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-7 The utility model provides an integrated permanent magnet biased three-degree-of-freedom magnetic suspension bearing, comprising a stator sleeve 1, a rotor core 2, a radial control winding 3, an axial control winding 4, a stator disk 5, an axial magnetic pole 6, a stator yoke 7, a radial magnetic pole 8 and a permanent magnet ring 9, wherein two stator disks 5 are respectively fixed at two ends of the stator sleeve 1, the rotor core 2 is rotatably arranged between the two stator disks 5, the permanent magnet ring 9 is embedded in the stator sleeve 1, the stator yoke 7 is fixed to the surface of the permanent magnet ring 9, the radial magnetic pole 8 is fixed to the surface of the stator yoke 7, the axial magnetic pole 6 is fixed to the surface of the stator disk 5, the radial control winding 3 is installed on the surface of the radial magnetic pole 8, the axial control winding 4 is installed on the surface of the axial magnetic pole 6, four radial air gaps are arranged between the radial magnetic pole 8 and the rotor core 2, two axial air gaps are arranged between the axial magnetic pole 6 and the rotor core 2, and there are bias magnetic fields and axial control magnetic fields in the axial air gaps.

[0024] See also Figure 1 and 2The stator sleeve 1, the rotor core 2, the stator disk 5 and the axial magnetic pole 6 are made of solid soft magnetic material, the stator yoke 7 and the radial magnetic pole 8 are made of laminated silicon steel sheets, the permanent magnet ring 9 is made of rare earth permanent magnet material, and the radial control winding 3 and the axial control winding 4 are wound by enameled wire. When the rotor core 2 is subjected to a load that does not exceed the bearing capacity of the magnetic bearing, the magnetic bearing can generate axial and radial suspension forces with controllable size and direction, thereby realizing stable suspension of the rotor core 2 with three degrees of freedom, such as Figure 7 As shown in the figure, in this process, DSP is used as the main control chip of the displacement outer loop to realize complex mathematical calculations, with fast instruction cycle, interrupt processing and hardware I / O support, which greatly improves the real-time response capability. FPGA is used as the main control chip of the current inner loop to realize various combinational logics, parallel operation of instructions and multi-channel 17 synchronous control. Combined with factors such as rotor mass and magnetic force, high-precision displacement sensors and other precision components are selected to accurately collect high-speed / ultra-high-speed rotor operation data, intelligently sense the deviation of the rotor from the center position, and develop control algorithms to intelligently adjust the current size and direction to achieve a stable equilibrium state.

[0025] A line arranging mechanism is provided on the surface of the stator sleeve 1, and the line arranging mechanism includes a wire rack 10 and an ear seat 11. The ear seat 11 is fixed to the surface of the stator sleeve 1. A groove 12 is provided on the surface of the ear seat 11. The groove 12 is connected to the stator sleeve 1 through a through hole 13. The wire rack 10 is installed on the surface of the stator sleeve 1. The ear seat 11 is arranged in the wire rack 10. The wire rack 10 includes two identical annular shells 14 and an adjustment seat 15. A through groove 16 is provided on the surface of the adjustment seat 15. A channel 17 is provided inside the annular shell 14. The two annular shells 14 are fixedly installed on the surface of the stator sleeve 1 through a connecting piece. The ear seat 11 is engaged in the channel 17. The adjustment seat 15 is slidably arranged between the two annular shells 14. The through groove 16 is connected to the stator sleeve 1 through the channel 17 and the cavity.

[0026] See also Figure 3 , 4 As for 6, since there are many sensors, many wires are needed. In this embodiment, a line arrangement mechanism is provided to arrange the wires. When in use, the wires are passed through the through hole 13 into the groove 12, and extend through the groove 12 to the channel 17, and finally led out through the through groove 16. All the wires will eventually converge in the through groove 16. At this time, the position of the through groove 16 at the notch 18 can be adjusted by moving the adjustment seat 15, so as to facilitate guiding all the wires to a position convenient for connection.

[0027] A notch 18 is provided on the surface of the annular shell 14, and a slide groove 19 matching the inner wall of the notch 18 is provided on the side of the adjustment seat 15. The adjustment seat 15 is slidably arranged in the two notches 18 through the slide groove 19. The wire rack 10 is made of insulating material, and both ends of the slide groove 19 are arranged as arc structures.

[0028] See also Figure 5 Since the annular housing 14 is in an arc shape as a whole, the adjustment seat 15 also needs to be set to an arc shape in order to adapt to the notch 18. The adjustment seat 15 can revolve in the notch 18 through the setting of the slide groove 19. In this embodiment, the angle of the notch 18 is set to 120°, which makes it possible to adjust the adjustment seat 15 within a range of 60° to the left and right, so that the adjustment seat 15 can drive one end of the wire to move to a suitable position through the through groove 16.

[0029] The connecting part includes a guide column 20, a connecting hole 21, a threaded hole 22 and a bolt 23. The guide column 20 is vertically fixed inside the channel 17. The connecting hole 21 is set through the surface of one of the annular shells 14, and the threaded hole 22 is set on the surface of the other annular shell 14 and the end face of the guide column 20. The bolt 23 passes through the connecting hole 21 and is threadedly connected in the threaded hole 22.

[0030] See also Figure 4 By setting the bolts 23, the annular housing 14 provided with the connecting hole 21 can be directly fixed on the annular housing 14 provided with the guide pillar 20, and the two annular housings 14 can be tightly fitted. In addition, by setting the guide pillar 20, the wire can be limited inside the channel 17 to prevent the wire from moving from the inside of the notch 18 to the outside of the channel 17 due to excessive length, and the guide pillar 20 can be used to assist in limiting the guide pillar 20, so as to facilitate the integrity of the wire.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated permanent magnet biased three-degree-of-freedom magnetic bearing, characterized in that: The invention comprises a stator sleeve (1), a rotor core (2), a radial control winding (3), an axial control winding (4), a stator disc (5), an axial magnetic pole (6), a stator yoke (7), a radial magnetic pole (8) and a permanent magnet ring (9), wherein the two stator discs (5) are respectively fixed at two ends of the stator sleeve (1), the rotor core (2) is rotatably arranged between the two stator discs (5), the permanent magnet ring (9) is embedded in the stator sleeve (1), the stator yoke (7) is fixed to the surface of the permanent magnet ring (9), and the permanent magnet ring (9) is provided with a plurality of stator discs (5). The radial magnetic pole (8) is fixed to the surface of the stator yoke (7), the axial magnetic pole (6) is fixed to the surface of the stator disk (5), the radial control winding (3) is installed on the surface of the radial magnetic pole (8), the axial control winding (4) is installed on the surface of the axial magnetic pole (6), four radial air gaps are arranged between the radial magnetic pole (8) and the rotor core (2), two axial air gaps are arranged between the axial magnetic pole (6) and the rotor core (2), and a bias magnetic field and an axial control magnetic field exist in the axial air gaps.

2. The integrated permanent magnet biased three-degree-of-freedom magnetic bearing according to claim 1, characterized in that: A line arrangement mechanism is provided on the surface of the stator sleeve (1), the line arrangement mechanism comprising a wire rack (10) and an ear seat (11), the ear seat (11) being fixed to the surface of the stator sleeve (1), the surface of the ear seat (11) being provided with a groove (12), the groove (12) being connected to the inside of the stator sleeve (1) via a through hole (13), the wire rack (10) being mounted on the surface of the stator sleeve (1), and the ear seat (11) being arranged in the wire rack (10).

3. The integrated permanent magnet biased three-degree-of-freedom magnetic bearing according to claim 2, characterized in that: The bobbin (10) comprises two identical annular shells (14) and an adjustment seat (15); a through groove (16) is provided on the surface of the adjustment seat (15); a channel (17) is provided inside the annular shell (14); the two annular shells (14) are fixedly mounted on the surface of the stator sleeve (1) via a connecting piece; the ear seat (11) is engaged in the channel (17); the adjustment seat (15) is slidably arranged between the two annular shells (14); and the through groove (16) is connected to the stator sleeve (1) via the channel (17) and the cavity.

4. The integrated permanent magnet biased three-degree-of-freedom magnetic bearing according to claim 3, characterized in that: The surface of the annular housing (14) is provided with a notch (18), and the side surface of the adjustment seat (15) is provided with a slide groove (19) matching the inner wall of the notch (18), and the adjustment seat (15) is slidably arranged in the two notches (18) through the slide groove (19).

5. The integrated permanent magnet biased three-degree-of-freedom magnetic bearing according to claim 3, characterized in that: The connecting member comprises a guide column (20), a connecting hole (21), a threaded hole (22) and a bolt (23); the guide column (20) is vertically fixed inside the channel (17); the connecting hole (21) is arranged through the surface of one of the annular shells (14); the threaded hole (22) is arranged on the surface of the other annular shell (14) and the end surface of the guide column (20); and the bolt (23) passes through the connecting hole (21) and is threadedly connected in the threaded hole (22).

6. The integrated permanent magnet biased three-degree-of-freedom magnetic bearing according to claim 4, characterized in that: The wire rack (10) is made of insulating material, and both ends of the slide groove (19) are arranged as arc-shaped structures.

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