Axial-radial hybrid excitation magnetic bearing with compensation winding

Abstract

The invention relates to an axial-radial hybrid excitation magnetic bearing with a compensation winding, which is characterized by comprising a rotor, an axial stator, a sleeve, a radial stator, a radial stator magnet yoke, an axial control winding, a radial control winding, a permanent magnet ring and the compensation winding, the radial stator is arranged on the peripheral side of the rotor and comprises a plurality of radial stator iron core magnetic poles which are uniformly distributed along the circumferential direction, and a radial control winding is wound on the radial stator iron core magnetic poles; the two axial stators are symmetrically arranged at the periphery of the rotor and the upper and lower sides of the radial stator, and the peripheries of the axial stators are connected with the sleeve; the radial stator magnet yoke is arranged on the peripheral side of the radial stator; the two permanent magnet rings are respectively arranged between the two axial stators and the radial stator magnet yoke; an axial control winding is wound between the sleeve and the radial stator magnet yoke; and the two compensation windings are respectively arranged between the axial stator and the permanent magnet ring. The magnetic bearing is compact in axial and radial design, low in power consumption, small in size, adjustable in rigidity, capable of restraining the axial eddy current effect and high in stability.

Description

Technical Field

[0001] The invention belongs to the field of magnetic suspension bearings, and in particular relates to an axial-radial hybrid excitation magnetic bearing with a compensation winding. Background Art

[0002] The basic principle of magnetic bearings is to use the magnetic field force between the stator core and the rotor core to achieve contactless support of the rotating shaft. Since there is no mechanical contact between the stator and the rotor, magnetic bearings have the following advantages: 1. Able to withstand extremely high speeds. A shaft supported by a magnetic bearing can run at supercritical speeds of hundreds of thousands of revolutions per minute, and its circumferential speed is limited only by the strength of the shaft material. Generally speaking, under the same journal diameter, the speed that a shaft supported by a magnetic bearing can reach is about 2 times higher than that of a shaft supported by a rolling bearing, and about 3 times higher than that of a shaft supported by a sliding bearing. Through experiments, the German FAG company concluded that the dn value of a rolling bearing, that is, the product of the average bearing diameter and the limiting speed of the spindle, is about 2.5~3×106mm•r / min, the dn value of a sliding bearing is about 0.8~2×106mm•r / min, and the dn value of a magnetic bearing is about 4~6×106mm•r / min.

[0003] 2. Low friction power consumption. At 10,000 r / min, the power consumption of the magnetic bearing is only about 6% of that of the fluid dynamic pressure lubrication bearing and only 17% of that of the rolling bearing, with obvious energy-saving effect.

[0004] 3. Long life and low maintenance cost. Since the magnetic bearing relies on the magnetic field force to suspend the rotating shaft, there is no mechanical contact between the stator and the rotor, so there is no life problem caused by friction, wear and contact fatigue. Therefore, the life and reliability of the magnetic bearing are much higher than those of traditional mechanical bearings.

[0005] 4. No need to add lubricant. Since there is no mechanical friction between the stator and the rotor, no lubricant needs to be added during operation, so there is no problem of environmental pollution caused by lubricants. In places where lubricants and pollution are prohibited, such as vacuum equipment, ultra-clean sterile rooms, etc., magnetic bearings have incomparable advantages.

[0006] Magnetic bearings are classified into active magnetic bearings, passive magnetic bearings, and hybrid magnetic bearings according to their working principles. Hybrid magnetic bearings combine the characteristics of both, using permanent magnets to provide bias magnetic fields and electromagnetic coils to generate control magnetic fields, which significantly reduces the power consumption of magnetic bearings and has become a research hotspot for magnetic bearings in recent years.

[0007] According to the direction of the levitation force, hybrid magnetic bearings are divided into three types: hybrid axial magnetic bearings, hybrid radial magnetic bearings and hybrid axial-radial magnetic bearings. Hybrid axial-radial magnetic bearings, also called hybrid three-degree-of-freedom magnetic bearings, can generate both axial and radial levitation forces. High-speed magnetic levitation motors use three-degree-of-freedom magnetic bearings to reduce the axial space of the rotor, thereby increasing the critical speed of the rotor. Therefore, the research on three-degree-of-freedom magnetic bearings has also become an important direction for the research and development of magnetic bearing technology. Summary of the invention

[0008] The object of the present invention is to provide an axial-radial hybrid excitation magnetic bearing with a compensating winding, which has compact axial and radial designs, low power consumption, small size, adjustable stiffness, can suppress axial eddy current effects, and has high stability.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an axial-radial hybrid excitation magnetic bearing with a compensation winding, characterized in that it includes a rotor, a first axial stator, a second axial stator, a sleeve, a radial stator, a radial stator yoke, an axial control winding, a radial control winding, a first permanent magnet ring, a second permanent magnet ring, a first compensation winding and a second compensation winding; the radial stator is arranged on the outer peripheral side of the rotor and there is a radial air gap between the radial stator and the outer wall of the rotor in the radial direction, the radial stator includes a plurality of radial stator core magnetic poles with the same structure and uniformly distributed along the circumference of the radial stator, and a radial control winding is wound on each radial stator core magnetic pole; the first axial stator and the second axial stator have the same structure and are symmetrically arranged on the upper and lower sides of the rotor periphery and the radial stator, and there is an axial air gap between the two axial stators and the rotor , and the outer peripheries of the two axial stators are connected with sleeves; the radial stator yoke is arranged on the outer periphery of the radial stator and is fixedly connected to the radial stator yoke, and the inner diameter of the radial stator yoke is equal to the outer diameter of the radial stator, the first permanent magnet ring is arranged between the first axial stator and the radial stator yoke and is fixedly connected to the radial stator yoke, and the inner and outer diameters of the first permanent magnet ring are respectively consistent with the inner and outer diameters of the radial stator yoke, the second permanent magnet ring is arranged between the second axial stator and the radial stator yoke and is fixedly connected to the radial stator yoke, and the inner and outer diameters of the second permanent magnet ring are respectively consistent with the inner and outer diameters of the radial stator yoke; an axial control winding is wound between the sleeve and the radial stator yoke; the first compensation winding is arranged between the first axial stator and the first permanent magnet ring, and the second compensation winding is arranged between the second axial stator and the second permanent magnet ring.

[0010] Furthermore, the width of the radial air gap is equal to that of the axial air gap.

[0011] Furthermore, the magnetic field strength of the first compensation bias magnetic field generated by the first compensation winding is equal to the magnetic field strength of the second compensation bias magnetic field generated by the second compensation winding.

[0012] Furthermore, the magnetization directions of the first permanent magnet ring and the second permanent magnet ring are both axial magnetization, and the N pole of the first permanent magnet ring faces the first axial stator and the S pole faces the radial stator yoke, and the N pole of the second permanent magnet ring faces the second axial stator and the S pole faces the radial stator yoke.

[0013] Further, the first compensation bias magnetic field generated by the first compensation winding and the second compensation bias magnetic field generated by the second compensation winding are both in the axial direction, and the directions of the first compensation bias magnetic field and the second compensation bias magnetic field remain opposite.

[0014] Furthermore, the magnetic circuit of the bias magnetic field generated by the first permanent magnet ring is: flowing out from the N pole of the first permanent magnet ring, passing through the first axial stator, the axial air gap, the rotor, the radial air gap, the radial stator, and the radial stator yoke, and returning to the S pole of the first permanent magnet ring; the magnetic circuit of the bias magnetic field generated by the second permanent magnet ring is: flowing out from the N pole of the second permanent magnet ring, passing through the second axial stator, the axial air gap, the rotor, the radial air gap, the radial stator, and the radial stator yoke, and returning to the S pole of the second permanent magnet ring.

[0015] Furthermore, the first compensating bias magnetic field generated by the direct current passing through the first compensation winding forms a magnetic circuit through the first axial stator, axial air gap, rotor, radial air gap, radial stator, radial stator yoke, and first permanent magnet ring, or forms a magnetic circuit through the first permanent magnet ring, radial stator yoke, radial stator, radial air gap, rotor, axial air gap, and first axial stator, and is in the opposite direction to the second compensating bias magnetic field generated by the direct current passing through the second compensation winding, thereby compensating the bias magnetic field and adjusting the stiffness of the magnetic bearing.

[0016] Furthermore, an alternating current is passed through the axial control winding, forming an axial alternating magnetic field through the first axial stator, the axial air gap, the rotor, the axial air gap, the second axial stator, and the sleeve, causing an eddy current effect to weaken the dynamic characteristics of the structure; the first compensation winding and the second compensation winding apply a magnetic field in the same direction and opposite to the axial alternating magnetic field, forming a compensating alternating magnetic field through the second axial stator, the axial air gap, the rotor, the axial air gap, the first axial stator, and the sleeve, thereby suppressing the eddy current effect of the axial iron core.

[0017] Furthermore, a direct current flows through the axial control winding, and a magnetic circuit generated among the sleeve, the first axial stator, the axial air gap, the rotor, the axial air gap, and the second axial stator is a constant axial control magnetic field.

[0018] Furthermore, when current flows through the radial control winding, a magnetic circuit generated in the radial stator yoke, the radial stator, the radial air gap and the rotor is a radial control magnetic field.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides an axial-radial hybrid excitation magnetic bearing with a compensation winding, which is relatively compact in both axial and radial design, has low power consumption and small size, and generates a compensation bias magnetic field and a compensation alternating magnetic field opposite to the axial alternating magnetic field by adding a compensation winding between the axial stator and the permanent magnet, which can not only effectively reduce the amount of permanent magnets used, but also superimpose the bias magnetic field generated by the permanent magnet to achieve real-time adjustment of stiffness. This design can effectively compensate for the influence of insufficient stiffness of the axial-radial hybrid excitation magnetic bearing when it is vibrated and the eddy current effect caused by axial disturbance, thereby improving the stability and dynamic performance of the system. Therefore, the present invention has strong practicality and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an axial-radial hybrid excitation magnetic bearing with a compensation winding according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the axial alternating magnetic field of the axial-radial hybrid excitation magnetic bearing with a compensating winding and the compensating alternating magnetic field generated by the compensating winding according to an embodiment of the present invention; Figure 3 2 is a cross-sectional view of a rotor and a radial stator in an embodiment of the present invention.

[0021] In the figure: 1-rotor; 21-first axial stator; 22-second axial stator; 3-sleeve; 4-radial stator; 41, 42, 43, 44-radial stator core poles; 5-radial stator yoke; 6-axial control winding; 71, 72, 73, 74-radial control winding; 81-first permanent magnet ring; 82-second permanent magnet ring; 91-first compensation winding; 92-second compensation winding; 101, 102-bias magnetic field; 111-first compensation bias magnetic field; 112-second compensation bias magnetic field; 12-axial control magnetic field; 13-radial control magnetic field; 14-axial air gap; 15-radial air gap; 16-axial alternating magnetic field; 17-compensating alternating magnetic field. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] like Figure 1-3 As shown, this embodiment provides an axial-radial hybrid excitation magnetic bearing with a compensation winding, characterized in that it includes a rotor 1, a first axial stator 21, a second axial stator 22, a sleeve 3, a radial stator 4, a radial stator yoke 5, an axial control winding 6, a radial control winding, a first permanent magnet ring 81, a second permanent magnet ring 82, a first compensation winding 91 and a second compensation winding 92; the radial stator 4 is arranged on the outer peripheral side of the rotor 1 and there is a radial air gap 15 between the radial stator 4 and the outer wall of the rotor 1 in the radial direction, the radial stator 4 includes a plurality of radial stator core magnetic poles with the same structure and uniformly distributed along the circumference of the radial stator, and the same radial control winding is wound on each radial stator core magnetic pole; the first axial stator 21 and the second axial stator 22 have the same structure and are symmetrically arranged on the circumference of the rotor 1 and the upper and lower sides of the radial stator 4, there is an axial air gap 14 between the two axial stators 21, 22 and the end surface of the rotor 1, and the outer periphery of the two axial stators is connected to the sleeve 3; the radial The stator yoke 5 is arranged on the outer peripheral side of the radial stator 4 and is fixedly connected to the radial stator yoke 5. The inner diameter of the radial stator yoke 5 is equal to the outer diameter of the radial stator 4. The first permanent magnet ring 81 is arranged between the first axial stator 21 and the radial stator yoke 5 and is fixedly connected to the radial stator yoke 5. The inner and outer diameters of the first permanent magnet ring 81 are respectively consistent with the inner and outer diameters of the radial stator yoke 5. The second permanent magnet ring 82 is arranged between the second axial stator 22 and the radial stator yoke 5 and is fixedly connected to the radial stator yoke 5. The yoke 5 is fixedly connected, and the inner and outer diameters of the second permanent magnet ring 82 are respectively consistent with the inner and outer diameters of the radial stator yoke 5; an axial control winding 6 is wound between the sleeve 3 and the radial stator yoke 5 and fixed on the inner side of the sleeve 3; the first compensation winding 91 is arranged between the first axial stator 21 and the first permanent magnet ring 81 and can be positioned on the first permanent magnet ring 81, and the second compensation winding 92 is arranged between the second axial stator 22 and the second permanent magnet ring 82 and can be positioned on the second permanent magnet ring 82.

[0026] In this embodiment, the width of the radial air gap 15 is equal to that of the axial air gap 14 .

[0027] like Figure 2As shown, in this embodiment, the inner circumference of the radial stator 4 extends toward the axis center to form four radial stator core poles 41, 42, 43, 44 with the same structure and evenly distributed in the circumferential direction. The same radial control windings 71, 72, 73, 74 are respectively wound on the four radial stator core poles 41, 42, 43, 44, and there is a radial air gap 15 between the outer wall of the rotor 1 in the radial direction.

[0028] The magnetization direction of the first permanent magnet ring 81 and the second permanent magnet ring 82 are both axial magnetization, and the N pole of the first permanent magnet ring 81 faces the first axial stator 21 and the S pole faces the radial stator yoke 5 , and the N pole of the second permanent magnet ring 82 faces the second axial stator 22 and the S pole faces the radial stator yoke 5 .

[0029] The first compensation bias magnetic field generated by the first compensation winding 91 and the second compensation bias magnetic field generated by the second compensation winding 92 are both in the axial direction, and the directions of the first compensation bias magnetic field and the second compensation bias magnetic field are opposite.

[0030] In this embodiment, two permanent magnet rings 81 and 82 generate bias magnetic fields 101 and 102 ( Figure 1 The blue solid line magnetic circuit with arrows in the figure). The magnetic circuit of the bias magnetic field 101 generated by the first permanent magnet ring 81 is: flowing out from the N pole of the first permanent magnet ring 81, passing through the first axial stator 21, the axial air gap, the rotor 1, the radial air gap 15, the radial stator 4, the radial stator yoke 5, and returning to the S pole of the first permanent magnet ring 81. The magnetic circuit of the bias magnetic field 102 generated by the second permanent magnet ring 82 is: flowing out from the N pole of the second permanent magnet ring 82, passing through the second axial stator 22, the axial air gap, the rotor 1, the radial air gap 15, the radial stator 4, the radial stator yoke 5, and returning to the S pole of the second permanent magnet ring 82. Compared with the traditional magnetic bearing method of using electromagnetic coils to generate bias magnetic fields, the present invention significantly reduces power consumption and improves the energy efficiency of the system.

[0031] In this embodiment, two sets of compensation windings 91 and 92 generate compensation bias magnetic fields 111 and 112 ( Figure 1The first compensation winding 91 generates a first compensation bias magnetic field when passing a direct current, and forms a complete magnetic circuit through the first axial stator 21, the axial air gap, the rotor 1, the radial air gap 15, the radial stator 4, the radial stator yoke 5, and the first permanent magnet ring 81, or forms a complete magnetic circuit through the first permanent magnet ring 81, the radial stator yoke 5, the radial stator 4, the radial air gap 15, the rotor 1, the axial air gap, and the first axial stator 21, and is opposite to the second compensation bias magnetic field generated by the second compensation winding 92 when passing a direct current, thereby compensating the bias magnetic field and adjusting the stiffness of the magnetic bearing. The magnetic field strength of the first compensation bias magnetic field generated by the first compensation winding 91 is equal to that of the second compensation bias magnetic field generated by the second compensation winding 92. Compared with the traditional axial-radial hybrid magnetic bearing, the present invention reduces the use of permanent magnets, makes the stiffness of the magnetic bearing adjustable, reduces the cost, and improves the suspension performance of the system.

[0032] In this embodiment, an alternating current is passed through the axial control winding 6, and an axial alternating magnetic field 16 is formed through the first axial stator 21, the axial air gap, the rotor 1, the axial air gap, the second axial stator 22, and the sleeve 3 ( Figure 2 The red dotted line with arrows in the middle), causing eddy current effect to weaken the dynamic characteristics of the structure. The two sets of compensation windings 91 and 92 generate a compensation alternating magnetic field 17 ( Figure 2 The first compensation windings 91 and 92 generate an alternating magnetic field 17 in the same direction and opposite to the axial alternating magnetic field 16, and a compensating alternating magnetic field 17 is formed through the second axial stator 22, the axial air gap, the rotor 1, the axial air gap, the first axial stator 21, and the sleeve 3. Compared with the traditional axial-radial hybrid magnetic bearing, the present invention can suppress the eddy current effect of the axial core and improve the dynamic performance of the system.

[0033] In this embodiment, a direct current is passed through the axial control winding 6, and a magnetic circuit generated by the sleeve 3, the first axial stator 21, the axial air gap 14, the rotor 1, the axial air gap 14, and the second axial stator 22 is a constant axial control magnetic field 12 ( Figure 1 The axial control magnetic field 12 is synthesized with the bias magnetic fields 101, 102 and the compensation bias magnetic fields 111, 112 in the axial air gap 14 to adjust the magnitude of the magnetic field in the axial air gap 14, thereby adjusting the magnitude and direction of the axial suspension force to achieve stable suspension of the rotor.

[0034] In this embodiment, current is passed through the radial control windings 71, 72, 73, and 74, and the magnetic circuit generated in the radial stator yoke 5, the radial stator 4, the radial air gap 15, and the rotor 1 is a radial control magnetic field 13 ( Figure 3The radial control magnetic field 13 is synthesized with the bias magnetic fields 101, 102 and the compensation bias magnetic fields 111, 112 in the radial air gap 15 to adjust the magnitude of the magnetic field in the radial air gap 15, thereby adjusting the magnitude and direction of the radial suspension force to achieve stable suspension of the rotor.

[0035] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. An axial-radial hybrid excitation magnetic bearing with a compensating winding, characterized in that: The invention comprises a rotor (1), a first axial stator (21), a second axial stator (22), a sleeve (3), a radial stator (4), a radial stator yoke (5), an axial control winding (6), a radial control winding, a first permanent magnet ring (81), a second permanent magnet ring (82), a first compensation winding (91) and a second compensation winding (92); the radial stator (4) is arranged on the outer peripheral side of the rotor (1) and a radial air gap exists between the radial stator (4) and the outer wall of the rotor (1) in the radial direction; the radial stator (4) is provided with a radial air gap between the radial stator (4) and the outer wall of the rotor (1) in the radial direction; and the radial stator (4) is provided with a radial air gap between the radial stator (4) and the outer wall of the rotor (1) in the radial direction. The radial stator (4) comprises a plurality of radial stator core magnetic poles of the same structure and uniformly distributed along the circumference of the radial stator, each radial stator core magnetic pole being wound with a radial control winding; the first axial stator (21) and the second axial stator (22) are of the same structure and are symmetrically arranged on the circumference of the rotor (1) and the upper and lower sides of the radial stator (4); an axial air gap exists between the two axial stators and the rotor (1), and the outer circumferences of the two axial stators are connected to the sleeve (3); the radial stator yoke (5) is arranged on the radial The first permanent magnet ring (81) is disposed between the first axial stator (21) and the radial stator yoke (5) and is fixedly connected to the radial stator yoke (5), and the inner diameter of the radial stator yoke (5) is equal to the outer diameter of the radial stator (4); the first permanent magnet ring (81) is disposed between the first axial stator (21) and the radial stator yoke (5) and is fixedly connected to the radial stator yoke (5), and the inner and outer diameters of the first permanent magnet ring (81) are respectively consistent with the inner and outer diameters of the radial stator yoke (5); the second permanent magnet ring (82) is disposed between the second axial stator (22) and the radial stator yoke The second permanent magnet ring (82) is fixedly connected to the stator yoke (5) and the radial stator yoke (5), and the inner and outer diameters of the second permanent magnet ring (82) are respectively consistent with the inner and outer diameters of the radial stator yoke (5); an axial control winding (6) is wound between the sleeve (3) and the radial stator yoke (5); the first compensation winding (91) is arranged between the first axial stator (21) and the first permanent magnet ring (81), and the second compensation winding (92) is arranged between the second axial stator (22) and the second permanent magnet ring (82).

2. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The width of the radial air gap is equal to that of the axial air gap.

3. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The magnetic field strength of the first compensation bias magnetic field generated by the first compensation winding (91) and the second compensation bias magnetic field generated by the second compensation winding (92) are equal.

4. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The magnetization directions of the first permanent magnet ring (81) and the second permanent magnet ring (82) are both axial magnetization, and the N pole of the first permanent magnet ring (81) faces the first axial stator (21), and the S pole faces the radial stator yoke (5), and the N pole of the second permanent magnet ring (82) faces the second axial stator (22), and the S pole faces the radial stator yoke (5).

5. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The first compensation bias magnetic field generated by the first compensation winding (91) and the second compensation bias magnetic field generated by the second compensation winding (92) are both in an axial direction, and the directions of the first compensation bias magnetic field and the second compensation bias magnetic field are opposite.

6. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The magnetic circuit of the bias magnetic field generated by the first permanent magnet ring (81) is as follows: it flows out from the N pole of the first permanent magnet ring (81), passes through the first axial stator (21), the axial air gap, the rotor (1), the radial air gap, the radial stator (4), the radial stator yoke (5), and returns to the S pole of the first permanent magnet ring (81); and the magnetic circuit of the bias magnetic field generated by the second permanent magnet ring (82) is as follows: it flows out from the N pole of the second permanent magnet ring (82), passes through the second axial stator (22), the axial air gap, the rotor (1), the radial air gap, the radial stator (4), the radial stator yoke (5), and returns to the S pole of the second permanent magnet ring (82).

7. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The first compensation winding (91) generates a first compensation bias magnetic field when a direct current is passed through the first compensation winding (91), and a magnetic circuit is formed through the first axial stator (21), the axial air gap, the rotor (1), the radial air gap, the radial stator (4), the radial stator yoke (5), and the first permanent magnet ring (81), or a magnetic circuit is formed through the first permanent magnet ring (81), the radial stator yoke (5), the radial stator (4), the radial air gap, the rotor (1), the axial air gap, and the first axial stator (21), and the direction is opposite to the second compensation bias magnetic field generated by the direct current passed through the second compensation winding (92), thereby compensating the bias magnetic field and adjusting the stiffness of the magnetic bearing.

8. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: The axial control winding (6) passes an alternating current, and forms an axial alternating magnetic field (16) through the first axial stator (21), the axial air gap, the rotor (1), the axial air gap, the second axial stator (22), and the sleeve (3), thereby causing an eddy current effect to weaken the dynamic characteristics of the structure; the first compensation winding (91) and the second compensation winding (92) apply a magnetic field in the same direction and opposite to the axial alternating magnetic field (16), and form a compensating alternating magnetic field (17) through the second axial stator (22), the axial air gap, the rotor (1), the axial air gap, the first axial stator (21), and the sleeve (3), thereby suppressing the eddy current effect of the axial core.

9. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: A direct current flows through the axial control winding (6), and a magnetic circuit generated in the sleeve (3), the first axial stator (21), the axial air gap, the rotor (1), the axial air gap, and the second axial stator (22) is a constant axial control magnetic field.

10. The axial-radial hybrid excitation magnetic bearing with compensation winding according to claim 1, characterized in that: When current flows through the radial control winding, a magnetic circuit generated in the radial stator yoke (5), the radial stator (4), the radial air gap and the rotor (1) is a radial control magnetic field.

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