Axial-radial hybrid excitation magnetic bearing with compensation winding

Abstract

The application relates to an axial-radial hybrid excitation magnetic bearing with a compensation winding, characterized in that the axial-radial hybrid excitation magnetic bearing comprises a rotor, an axial stator, a sleeve, a radial stator, a radial stator magnetic yoke, an axial control winding, a radial control winding, a permanent magnet ring and a compensation winding; the radial stator is arranged on the outer circumferential side of the rotor and comprises a plurality of radial stator iron core magnetic poles uniformly distributed in the circumferential direction and having the radial control winding wound thereon; two axial stators are symmetrically arranged on the upper and lower sides of the circumferential part of the rotor and the radial stator and the outer circumferential parts of the two axial stators are connected with the sleeve; the radial stator magnetic yoke is arranged on the outer circumferential side of the radial stator, and two permanent magnet rings are respectively arranged between the two axial stators and the radial stator magnetic yoke; the axial control winding is wound between the sleeve and the radial stator magnetic yoke; and two compensation windings are respectively arranged between the axial stators and the permanent magnet rings. The axial-radial hybrid excitation magnetic bearing has the advantages of compact axial and radial design, low power consumption, small volume, adjustable rigidity, inhibition of axial eddy current effect and high stability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of magnetic suspension bearing, and particularly relates to an axial-radial hybrid excitation magnetic bearing with a compensation winding. BACKGROUND

[0002] The basic principle of magnetic suspension bearing is to realize the non-contact support of the rotating shaft by using the magnetic force between the stator core and the rotor core. Since there is no mechanical contact between the stator and the rotor, the magnetic suspension bearing has the following advantages:

[0003] 1. It can withstand extremely high rotating speed. The rotating shaft supported by the magnetic suspension bearing can operate at supercritical speed of tens of ten-thousands of revolutions per minute, and its circumferential speed is only limited by the strength of the rotating shaft material. Generally, under the condition of the same shaft neck diameter, the rotating speed of the rotating shaft supported by the magnetic suspension bearing is about 2 times higher than that of the rotating shaft supported by the rolling bearing, and about 3 times higher than that of the rotating shaft supported by the sliding bearing. Through experiments, FAG Company of Germany has obtained that the dn value of the rolling bearing, i.e. the product of the average diameter of the bearing and the limit rotating speed of the main shaft, is about 2.5-3×106 mm·r / min, the dn value of the sliding bearing is about 0.8-2×106 mm·r / min, and the dn value of the magnetic suspension bearing is about 4-6×106 mm·r / min.

[0004] 2. It has smaller friction power consumption. At 10000 r / min, the power consumption of the magnetic suspension bearing is about 6% of that of the fluid dynamic pressure lubrication support, and about 17% of that of the rolling support, and the energy saving effect is obvious.

[0005] 3. It has long service life and low maintenance cost. Since the magnetic suspension bearing suspends the rotating shaft by the magnetic force, there is no mechanical contact between the stator and the rotor, and thus there is no service life problem caused by friction, wear and contact fatigue, so the service life and reliability of the magnetic suspension bearing are much higher than those of the traditional mechanical bearing.

[0006] 4. It does not need to add lubricant. Since there is no mechanical friction between the stator and the rotor, no lubricant needs to be added during operation, and thus there is no pollution problem caused by the lubricant to the environment, and the magnetic suspension bearing has an incomparable advantage in the occasions where the use of lubricant is prohibited and pollution is prohibited, such as vacuum equipment, super-clean sterile room and the like.

[0007] The magnetic suspension bearing is divided into active magnetic suspension bearing, passive magnetic suspension bearing and hybrid magnetic suspension bearing according to the working principle. The hybrid magnetic suspension bearing combines the characteristics of the two, uses the permanent magnet to provide the bias magnetic field, and the electromagnetic coil generates the control magnetic field, which significantly reduces the power consumption of the magnetic suspension bearing, and becomes the research hotspot of the magnetic suspension bearing in recent years.

[0008] According to the direction of generating the suspension force, the hybrid magnetic suspension bearing has three types of a hybrid axial magnetic suspension bearing, a hybrid radial magnetic suspension bearing and a hybrid axial-radial magnetic suspension bearing. The hybrid axial-radial magnetic suspension bearing, also called a hybrid three-degree-of-freedom magnetic suspension bearing, can generate both axial suspension force and radial suspension force. The use of the three-degree-of-freedom magnetic suspension bearing in a high-speed magnetic suspension motor can reduce the axial space of the rotor, thereby improving the critical speed of the rotor. Therefore, the research on the three-degree-of-freedom magnetic suspension bearing has become an important direction of the research and development of the magnetic suspension bearing technology. SUMMARY

[0009] The axial-radial hybrid excitation magnetic bearing with compensation windings has a compact axial and radial design, low power consumption, small volume, adjustable stiffness, can suppress axial eddy current effect and has high stability.

[0010] To achieve the above object, the technical scheme adopted by the present application is: an axial-radial hybrid excitation magnetic bearing with compensation windings, characterized in that it comprises 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 circumferential 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 comprises a plurality of radial stator core magnetic poles which are the same in structure and uniformly distributed in the circumferential direction of the radial stator, and the radial control winding is wound on each radial stator core magnetic pole; the first axial stator and the second axial stator are the same in structure and symmetrically arranged on the upper and lower sides of the circumferential part of the rotor and the radial stator, there is an axial air gap between the two axial stators and the rotor, and the outer circumferential part of the two axial stators is connected to the sleeve; the radial stator yoke is arranged on the outer circumferential side of the radial stator and fixedly connected to the radial stator yoke, 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 fixedly connected to the radial stator yoke, the inner and outer diameters of the first permanent magnet ring are consistent with the inner and outer diameters of the radial stator yoke respectively, the second permanent magnet ring is arranged between the second axial stator and the radial stator yoke and fixedly connected to the radial stator yoke, and the inner and outer diameters of the second permanent magnet ring are consistent with the inner and outer diameters of the radial stator yoke respectively; the 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.

[0011] Further, the width of the radial air gap is equal to the width of the axial air gap.

[0012] Further, the first compensation bias magnetic field generated by the first compensation winding is equal in magnetic field strength to the second compensation bias magnetic field generated by the second compensation winding.

[0013] Further, the first permanent magnet ring and the second permanent magnet ring are both axially magnetized, 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.

[0014] Further, the first compensation bias magnetic field generated by the first compensation winding is equal in magnetic field strength to the second compensation bias magnetic field generated by the second compensation winding.

[0015] Further, the magnetic circuit of the bias magnetic field generated by the first permanent magnet ring is: from the N pole of the first permanent magnet ring, through the first axial stator, the axial air gap, the rotor, the radial air gap, the radial stator, and the radial stator yoke, back 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: from the N pole of the second permanent magnet ring, through the second axial stator, the axial air gap, the rotor, the radial air gap, the radial stator, and the radial stator yoke, back to the S pole of the second permanent magnet ring.

[0016] Further, the first compensation bias magnetic field generated by the first compensation winding forms a magnetic circuit through the first axial stator, the axial air gap, the rotor, the radial air gap, the radial stator, the radial stator yoke, and the first permanent magnet ring, or forms a magnetic circuit through the first permanent magnet ring, the radial stator yoke, the radial stator, the radial air gap, the rotor, the axial air gap, and the first axial stator, and is opposite in direction to the second compensation bias magnetic field generated by the second compensation winding, thereby compensating the bias magnetic field and adjusting the stiffness of the magnetic bearing.

[0017] Further, the axial control winding passes an alternating current, 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 eddy current effects 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 compensation 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 effects of the axial core.

[0018] Further, the magnetic circuit generated by the axial control winding passing a direct current is a constant axial control magnetic field through the sleeve, the first axial stator, the axial air gap, the rotor, the axial air gap, and the second axial stator.

[0019] Further, the radial control winding passes current, and a magnetic loop generated by the radial stator yoke, the radial stator, the radial air gap and the rotor is a radial control magnetic field.

[0020] Compared with the prior art, the present application has the following beneficial effects: the present application provides an axial-radial hybrid excitation magnetic bearing with a compensation winding, which is compact in axial and radial design, low in power consumption and small in size, and can effectively reduce the use amount of permanent magnets and realize real-time adjustment of stiffness by adding a compensation winding between the axial stator and the permanent magnet to generate a compensation alternating magnetic field opposite to the compensation bias magnetic field of the axial alternating magnetic field. The design can effectively compensate the insufficient stiffness of the axial-radial hybrid excitation magnetic bearing when subjected to vibration and the eddy current effect caused by axial disturbance, thereby improving the stability and dynamic performance of the system. Therefore, the present application has strong practicability and broad application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the axial-radial hybrid excitation magnetic bearing with a compensation winding in the embodiment of the present application;

[0022] Figure 2 is a schematic view of the axial alternating magnetic field and the compensation alternating magnetic field generated by the compensation winding of the axial-radial hybrid excitation magnetic bearing with a compensation winding in the embodiment of the present application;

[0023] Figure 3 is a sectional view of the rotor and the radial stator in the embodiment of the present application.

[0024] 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 magnetic 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-compensation alternating magnetic field. DETAILED DESCRIPTION

[0025] The present application will be further described below in combination with the drawings and embodiments.

[0026] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0027] It is also important to note that the terms used herein are not intended to limit the particular embodiments of the present application disclosed in this specification. Rather, unless otherwise specified, as utilized in describing the preferred embodiments of the present application, the terms "comprises", "comprising", "includes", "including" and the like are used in the sense of "including but not limited to".

[0028] As shown in Figures 1-3 The present embodiment provides an axial-radial hybrid excitation magnetic bearing with compensation winding, characterized in that it 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 circumferential 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 comprises a plurality of radial stator core magnetic poles which are identical in structure and uniformly distributed in the circumferential direction of the radial stator, and each radial stator core magnetic pole has the same radial control winding wound thereon; the first axial stator 21 and the second axial stator 22 are identical in structure and symmetrically arranged on the upper and lower sides of the rotor 1 and the radial stator 4, there is an axial air gap 14 between the two axial stators 21, 22 and the end face of the rotor 1, and the outer circumferential part of the two axial stators is connected to the sleeve 3; the radial stator yoke 5 is arranged on the outer circumferential side of the radial stator 4 and fixedly connected with 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 fixedly connected with the radial stator yoke 5, and the inner and outer diameters of the first permanent magnet ring 81 are consistent with the inner and outer diameters of the radial stator yoke 5, respectively, the second permanent magnet ring 82 is arranged between the second axial stator 22 and the radial stator yoke 5 and fixedly connected with the radial stator yoke 5, and the inner and outer diameters of the second permanent magnet ring 82 are consistent with the inner and outer diameters of the radial stator yoke 5, respectively; the axial control winding 6 is wound between the sleeve 3 and the radial stator yoke 5 and fixedly arranged 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.

[0029] In the present embodiment, the width of the radial air gap 15 is equal to that of the axial air gap 14.

[0030] like Figure 2 As shown, in this embodiment, the inner periphery of the radial stator 4 extends towards the axis to form four identical radial stator core magnetic poles 41, 42, 43, and 44, which are evenly distributed along the circumferential direction. Identical radial control windings 71, 72, 73, and 74 are wound on the four radial stator core magnetic poles 41, 42, 43, and 44, and each has a radial air gap 15 between itself and the outer wall of the rotor 1 in the radial direction.

[0031] The magnetization direction of the first permanent magnet ring 81 and the second permanent magnet ring 82 is axial magnetization. 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. 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.

[0032] 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 axial, and the directions of the first compensation bias magnetic field and the second compensation bias magnetic field are opposite.

[0033] In this embodiment, bias magnetic fields 101 and 102 are generated by two permanent magnet rings 81 and 82. Figure 1 The magnetic circuit of the bias magnetic field 101 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, through the first axial stator 21, the axial air gap, the rotor 1, the radial air gap 15, the radial stator 4, and the radial stator yoke 5, and returns 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 as follows: it flows out from the N pole of the second permanent magnet ring 82, through the second axial stator 22, the axial air gap, the rotor 1, the radial air gap 15, the radial stator 4, and the radial stator yoke 5, and returns to the S pole of the second permanent magnet ring 82. Compared with the traditional method of using electromagnetic coils to generate bias magnetic fields in magnetic bearings, this invention significantly reduces power consumption and improves the energy efficiency of the system.

[0034] In this embodiment, two sets of compensating windings 91 and 92 generate compensating bias magnetic fields 111 and 112. Figure 1The first compensation winding 91 generates the first compensation bias magnetic field by passing DC current, which 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 passing DC current through the second compensation winding 92, thereby compensating the bias magnetic field and adjusting the stiffness of the magnetic bearing. The first compensation bias magnetic field generated by the first compensation winding 91 has the same magnetic field strength as the second compensation bias magnetic field generated by the second compensation winding 92. Compared with the conventional axial-radial hybrid magnetic bearing, the application 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.

[0035] In this embodiment, the axial control winding 6 is passed through alternating current, and the 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 (the red dotted line with arrows in the middle) Figure 2 The compensation alternating magnetic field 17 is generated by the two groups of compensation windings 91 and 92 (the yellow dotted line with arrows in the middle) Figure 2 The first compensation winding 91 and 92 generate the same direction and opposite direction of the axial alternating magnetic field 16, and the compensation 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 conventional axial-radial hybrid magnetic bearing, the application can suppress the eddy current effect of the axial core and improve the dynamic performance of the system.

[0036] In this embodiment, the axial control winding 6 is passed through DC current, and the 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 the constant axial control magnetic field 12 (the red dotted line with arrows in the middle) Figure 1 The axial control magnetic field 12 is synthesized with the bias magnetic field 101 and 102 and the compensation bias magnetic field 111 and 112 in the axial air gap 14, adjusts the size of the magnetic field in the axial air gap 14, thereby adjusting the size and direction of the axial suspension force, and realizing the stable suspension of the rotor.

[0037] In this embodiment, the radial control windings 71, 72, 73, and 74 are passed through current, and the magnetic circuit generated by the radial stator yoke 5, the radial stator 4, the radial air gap 15, and the rotor 1 is the radial control magnetic field 13 (the yellow dotted line with arrows in the middle) Figure 3The radial control magnetic field 13 is synthesized with the bias magnetic field 101, 102 and the compensation bias magnetic field 111, 112 in the radial air gap 15, to adjust the size of the radial air gap 15 magnetic field, so as to adjust the size and direction of the radial suspension force, to realize the stable suspension of the rotor.

[0038] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application, and in accordance with the technical essence of the present application, still falls within the protection scope of the technical solution of the present application.

Claims

1. An axial-radial hybrid excitation magnetic bearing with a compensating winding, characterized in that, The system 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 located on the outer periphery of the rotor (1), and there is a radial air gap between the radial stator (4) and the outer wall of the rotor (1) in the radial direction. The stator (4) includes multiple radial stator core magnetic poles with identical structures and uniformly distributed along the radial stator circumference. Each radial stator core magnetic pole is wound with a radial control winding. The first axial stator (21) and the second axial stator (22) have identical structures 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 between the two axial stators and the rotor (1), and the outer periphery of the two axial stators is connected to the sleeve (3). The radial stator yoke (5) is arranged in the radial direction. The stator (4) is fixedly connected to the outer periphery of 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). The inner and outer diameters of the first permanent magnet ring (81) are consistent with the inner and outer diameters of the radial stator yoke (5), respectively. The second permanent magnet ring (82) is disposed between the second axial stator (22) and the radial stator yoke (4). The stator yoke (5) is fixedly connected to the radial stator yoke (5), and the inner and outer diameters of the second permanent magnet ring (82) are consistent with the inner and outer diameters of the radial stator yoke (5), respectively; an axial control winding (6) is wound between the sleeve (3) and the radial stator yoke (5); the first compensation winding (91) is located between the first axial stator (21) and the first permanent magnet ring (81), and the second compensation winding (92) is located between the second axial stator (22) and the second permanent magnet ring (82).

2. The axial-radial hybrid excitation magnetic bearing with a compensating winding according to claim 1, characterized in that, The radial air gap has the same width as the axial air gap.

3. The axial-radial hybrid excitation magnetic bearing with compensating 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) is equal to that of the second compensation bias magnetic field generated by the second compensation winding (92).

4. The axial-radial hybrid excitation magnetic bearing with a compensating winding according to claim 1, characterized in that, The first permanent magnet ring (81) and the second permanent magnet ring (82) are both magnetized in the axial direction. The N pole of the first permanent magnet ring (81) is oriented towards the first axial stator (21) and the S pole is oriented towards the radial stator yoke (5). The N pole of the second permanent magnet ring (82) is oriented towards the second axial stator (22) and the S pole is oriented towards the radial stator yoke (5).

5. The axial-radial hybrid excitation magnetic bearing with a compensating 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 axial, 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 a compensating 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), through the first axial stator (21), axial air gap, rotor (1), radial air gap, radial stator (4), and radial stator yoke (5), and returns to the S pole of the first permanent magnet ring (81); 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), through the second axial stator (22), axial air gap, rotor (1), radial air gap, radial stator (4), and radial stator yoke (5), and returns to the S pole of the second permanent magnet ring (82).

7. An axial-radial hybrid excitation magnetic bearing with a compensating winding according to claim 1, characterized in that, The first compensation bias magnetic field generated by the DC current flowing through the first compensation winding (91) forms a magnetic circuit through the first axial stator (21), axial air gap, rotor (1), radial air gap, radial stator (4), radial stator yoke (5), and first permanent magnet ring (81), or through the first permanent magnet ring (81), radial stator yoke (5), radial stator (4), radial air gap, rotor (1), axial air gap, and first axial stator (21), and is opposite in direction to the second compensation bias magnetic field generated by the DC current flowing 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 a compensating winding according to claim 1, characterized in that, The axial control winding (6) carries an alternating current, which forms an axial alternating magnetic field (16) through the first axial stator (21), axial air gap, rotor (1), axial air gap, second axial stator (22), and sleeve (3), causing eddy current effect and weakening 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), which forms a compensation alternating magnetic field (17) through the second axial stator (22), axial air gap, rotor (1), axial air gap, first axial stator (21), and sleeve (3), thereby suppressing the eddy current effect of the axial core.

9. An axial-radial hybrid excitation magnetic bearing with a compensating winding according to claim 1, characterized in that, The axial control winding (6) carries a DC current, and the 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. An axial-radial hybrid excitation magnetic bearing with a compensating winding according to claim 1, characterized in that, The radial control winding is energized, and the magnetic circuit generated by the radial stator yoke (5), radial stator (4), radial air gap, and rotor (1) forms the radial control magnetic field.

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