Motor based on permanent magnet type axial hybrid magnetic suspension bearing

Abstract

The invention relates to the technical field of magnetic suspension motors, and provides a motor based on a permanent magnet type axial hybrid magnetic suspension bearing, an axial bearing is a permanent magnet type axial hybrid magnetic suspension bearing, the axial bearing comprises a magnetic pole shell, a magnetic steel ring and a coil, a rotor is provided with a thrust disc, the thrust disc comprises a thrust disc inner ring and a thrust disc outer ring, and the thrust disc outer ring is provided with a rotor. The magnetic steel ring is mounted between the thrust disc inner ring and the thrust disc outer ring; and an air gap is formed between the magnetic pole shell and the thrust disc. Magnetic fields generated by the magnetic pole shells on the two sides of the permanent magnet type axial hybrid magnetic suspension bearing can limit the magnetic steel rings, so that the thrust disc is located at the center of the two sets of magnetic pole shells; when the controller detects that the thrust disc deviates, the coil is electrified to generate a deviation correction magnetic field, so that the thrust disc returns to the center; the magnetic circuit of the whole magnetic bearing is provided with a ferromagnetic magnetic conductive magnetic circuit, so that the magnetic leakage is smaller, the power consumption is lower, the whole structure is simpler, and the cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic suspension motors, and in particular to a motor based on a permanent magnet type axial hybrid magnetic suspension bearing. Background Art

[0002] A magnetic levitation motor is a motor that uses magnetic levitation technology to achieve contactless support of the rotor. It has the advantages of low friction, high speed, high efficiency, high power, and long life. Magnetic levitation bearings are required in magnetic levitation motors. The rotor is suspended by magnetic levitation bearings under electromagnetic force to avoid direct contact with the stator and reduce friction and wear.

[0003] In magnetic levitation motors, radial magnetic levitation bearings and axial magnetic levitation bearings are usually used together. Axial magnetic levitation bearings are magnetic levitation bearings that constrain the axial translation of the rotor. They can generally be divided into passive axial permanent magnetic levitation bearings, active axial pure electromagnetic levitation bearings, and permanent magnetic bias plus electromagnetic active control axial hybrid magnetic levitation bearings. Permanent magnetic bias plus electromagnetic control axial hybrid magnetic levitation bearings use permanent magnets to generate bias magnetic fields, and no bias current is required in the coils. Therefore, the system power consumption is greatly reduced and the efficiency is higher.

[0004] Axial hybrid magnetic bearings have attracted much attention from the industry due to their low power consumption advantage and have become an important direction for the research and development of magnetic bearings. Currently, most of the existing axial hybrid magnetic bearings are multi-layer disc type. However, the existing axial hybrid magnetic bearings have various problems. For example, the axial hybrid magnetic bearing disclosed in Chinese invention patent application CN101054997A installs a permanent magnet on a stator and uses an auxiliary air gap to provide a path for the electromagnetic magnetic circuit. Due to the existence of the auxiliary air gap, the leakage magnetic flux of the bias magnetic field is large, the amount of permanent magnets used is large, the magnetic resistance of the circuit magnetic circuit is increased, the control power consumption is increased, and the system structure is relatively complex and difficult to manufacture. Chinese invention patent application CN101581336A adopts a multi-layer disk structure, and provides a bias magnetic field by adding an axial permanent magnet ring and a radial magnetic conductive plate. The axial length of the system is large, the structure is complex, and the existence of the radial magnetic circuit will produce coupling interference electromagnetic force related to the radial operation of the rotor. Chinese invention patent application CN102927128A adopts a dual rotor structure, which can eliminate the coupling interference of the axial hybrid magnetic bearing on radial motion in Chinese invention patent application CN101581336A, but due to the axial multi-layer disk design adopted, the axial length of the system is large, the structure is complex, and the manufacturing and assembly are difficult.

[0005] In summary, the existing axial hybrid magnetic bearings with permanent magnet bias and electromagnetic active control generally have problems such as complex structure, large volume and mass, difficult design and production, high power consumption, difficult manufacturing and assembly, difficult maintenance, and high cost. As a result, motors using magnetic bearings also generally have the above problems. The existing technology needs to be improved. Summary of the invention

[0006] The purpose of the present invention is to provide a motor based on a permanent magnet axial hybrid magnetic suspension bearing, aiming to solve the problems of complex structure, large size and high cost of the axial hybrid magnetic suspension bearing in the existing magnetic suspension motor.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a motor based on a permanent magnet axial hybrid magnetic suspension bearing, comprising a motor body, the motor body comprising a rotor, a stator, a motor housing, a radial bearing and an axial bearing, the stator is installed in the motor housing, a bearing seat is provided on the motor housing, the bearing seat is used to install the radial bearing and the axial bearing, and the rotor is installed in the motor housing through the radial bearing and the axial bearing; The axial bearing is a permanent magnet axial hybrid magnetic suspension bearing. The axial bearing includes a pole shell, a magnetic steel ring and a coil. A thrust plate is arranged on the rotor. The thrust plate includes a thrust plate inner ring and a thrust plate outer ring. The magnetic steel ring is installed between the thrust plate inner ring and the thrust plate outer ring. Pole shells are arranged on both sides of the magnetic steel ring. Grooves are opened in the pole shells on both sides. The coil is embedded in the grooves. The depth of the groove is consistent with the thickness of the coil. An air gap is arranged between the pole shell and the thrust plate. The width of the air gap is H1, 0.25mm≤H1≤0.75mm.

[0008] Furthermore, a displacement sensor is provided on the bearing seat, and the displacement sensor is used to detect the offset of the thrust plate.

[0009] Furthermore, the thickness of the coil is consistent with the thickness of the magnetic steel ring, and the thickness of the coil and the magnetic steel ring are both D1, 9mm≤D1≤12mm, the width of the coil is H2, and the ratio of H2 to D1 is 1:1; the width of the magnetic steel ring is H3, and the ratio of H3 to D1 is 3:2, and the width of the magnetic steel ring is consistent with the width of the inner ring of the thrust disk and the width of the outer ring of the thrust disk.

[0010] Furthermore, the magnetic steel ring is a permanent magnet, and the magnetic steel ring is in a circular ring shape, the N pole of the magnetic steel ring is located at the outer ring of the ring, and the S pole of the magnetic steel ring is located at the inner ring of the ring.

[0011] Furthermore, the cross-section of the pole shell is U-shaped, the pole shell is a permanent magnet, the S pole and the N pole of the pole shell are both located on the side with the groove, the S pole of the pole shell is located outside the groove, and the N pole of the pole shell is located inside the groove.

[0012] Furthermore, the coil is wound by enameled copper wire, the diameter of the enameled copper wire is between 0.1 mm and 1.25 mm, and the number of turns of the coil is between 180 and 250.

[0013] Furthermore, the pole shell and the magnetic steel ring are both made of permanent ferrite material.

[0014] Furthermore, a set of radial bearings are arranged at both the front and rear ends of the rotor, and an axial bearing is arranged at the front end of the rotor where the radial bearings are installed.

[0015] Furthermore, a ball bearing is installed between the rotor and the motor housing.

[0016] The motor based on the permanent magnet axial hybrid magnetic suspension bearing provided by the present invention, compared with the prior art, the magnetic field generated by the pole shells on both sides of the axial bearing can limit the magnetic steel ring, so that the thrust plate is located at the center of the two groups of pole shells; when the controller detects that the thrust plate is offset, the coil is energized to generate a corrective magnetic field, so that the thrust plate returns to the center; because the magnetic circuit of the entire magnetic bearing has a ferromagnetic magnetic conductive magnetic circuit, the leakage magnetic flux is smaller, the power consumption is lower, and the overall structure is simpler and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereoscopic view of the present invention; Figure 2 is a three-dimensional view of the axial bearing in the present invention; Figure 3 is a cross-sectional view of the axial bearing in the present invention; Figure 4 yes Figure 3 A partial enlarged view of part A; Figure 5 It is a schematic diagram of magnetic flux lines when the axial bearing is corrected to the right in the present invention; Figure 6 It is a schematic diagram of magnetic flux lines when the axial bearing corrects the deviation to the left in the present invention; Figure 7 It is an exploded view of the axial bearing in the present invention.

[0018] Description of reference numerals: in; 1. Rotor; 10. Stator; 11. Axial bearing; 12. Bearing seat; 13. Radial bearing; 14. Motor housing; 15. Ball bearing; 2. Pole housing; 20. Groove; 3. Inner ring of thrust plate; 4. Outer ring of thrust plate; 5. Coil; 6. Magnetic steel ring; 7. Air gap; 8. Limiting magnetic field; 9. Correcting magnetic field. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with specific embodiments.

[0020] In the present invention, unless otherwise clearly specified and limited, when terms such as "set on", "connected" and "connected" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The directional words that appear in the present invention are to better illustrate the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of the present invention changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.

[0021] like Figures 1 to 7 As shown, the present invention provides a motor based on a permanent magnet axial hybrid magnetic suspension bearing, the motor body includes a rotor 1, a stator 10, a motor housing 14, a radial bearing 13 and an axial bearing 11, the stator 10 is installed in the motor housing 14, a bearing seat 12 is provided on the motor housing 14, the bearing seat 12 is used to install the radial bearing 13 and the axial bearing 11, and the rotor 1 is installed in the motor housing 14 through the radial bearing 13 and the axial bearing 11; The axial bearing 11 is a permanent magnet axial hybrid magnetic suspension bearing, which includes a pole shell 2, a magnetic steel ring 6 and a coil 5. A thrust plate is arranged on the rotor 1, and the thrust plate includes a thrust plate inner ring 3 and a thrust plate outer ring 4. The magnetic steel ring 6 is installed between the thrust plate inner ring 3 and the thrust plate outer ring 4; pole shells 2 are arranged on both sides of the magnetic steel ring 6, and grooves 20 are opened in the pole shells 2 on both sides, and the coil 5 is embedded in the groove 20, and the depth of the groove 20 is consistent with the thickness of the coil 5; an air gap 7 is arranged between the pole shell 2 and the thrust plate, and the width of the air gap 7 is H1, 0.25mm≤H1≤0.75mm.

[0022] The magnetic steel ring 6 can be installed between the thrust plate inner ring 3 and the thrust plate outer ring 4 by bonding, interference fit or mechanical clamping. The magnetic field generated by the pole shell 2 can confine the magnetic steel ring 6 between the two pole shells 2, and the air gap 7 between the pole shell 2 and the thrust plate can prevent the pole shell 2 from contacting the magnetic steel ring 6, while ensuring that the magnetic steel ring 6 is within the confinement of the magnetic field.

[0023] It should be noted that, in the prior art, the magnetic steel ring 6 is usually arranged on the pole shell 2, and such a design will increase the thickness of the magnetic bearing; in the present embodiment, the magnetic steel ring 6 is arranged between the thrust plate inner ring 3 and the thrust plate outer ring 4, and during the rotation process, the magnetic steel ring 6 rotates together with the thrust plate inner ring 3, the rotor 1 and the thrust plate outer ring 4. The thrust plate inner ring 3, the magnetic steel ring 6 and the thrust plate outer ring 4 should be regarded as a whole during the operation. The method of arranging the magnetic steel ring 6 on the rotor 1 not only reduces the volume of the magnetic bearing, but also reduces the maintenance cost while ensuring its normal operation.

[0024] Through the above design scheme, adding a magnetic steel ring 6 made of permanent magnets to the thrust disk can improve the magnetic field strength between the two pole shells 2. The annular magnetic steel ring 6 can be directly glued between the thrust disk inner ring 3 and the thrust disk outer ring 4, which greatly simplifies the installation method and facilitates subsequent maintenance and replacement operations. The air gap 7 greater than or equal to 0.25mm and less than or equal to 0.75mm can balance the magnetic field and safety requirements. The magnetic suspension bearing needs to rely on magnetic force to make the thrust disk inner ring 3 and the thrust disk outer ring 4 have no physical contact with the pole shell 2. The larger air gap 7 will increase the coverage of the magnetic field, which will reduce the limiting effect of the limiting magnetic field 8 described later. The magnetic steel ring 6 with a larger magnetic force is required to make the limiting magnetic field 8 work. When the correction magnetic field 9 described later is energized to return the rotor 1 to the equilibrium position, a larger current is required, which will increase the power consumption while reducing the efficiency; if the air gap 7 is small, the rotor 1 may collide with the pole shell 2 when the power is off or an accident occurs, which will cause wear to the components and there will be safety hazards.

[0025] In this embodiment, a displacement sensor is provided on the bearing seat 12, and the displacement sensor is used to detect the displacement of the thrust plate.

[0026] In this embodiment, the thickness of the coil 5 is consistent with the thickness of the magnetic steel ring 6, and the thickness of the coil 5 and the magnetic steel ring 6 are both D1, 9mm≤D1≤12mm, the width of the coil 5 is H2, and the ratio of H2 to D1 is 1:1; the width of the magnetic steel ring 6 is H3, and the ratio of H3 to D1 is 3:2, and the width of the magnetic steel ring 6 is consistent with the width of the thrust plate inner ring 3 and the width of the thrust plate outer ring 4. The thickness and width of the coil 5 and the magnetic steel ring 6 are the preferred range values, and better effects can be obtained by operating within this numerical range. Designers can reasonably adjust the above data according to actual needs.

[0027] In this embodiment, the magnetic steel ring 6 is a permanent magnet, and the magnetic steel ring 6 is in a circular ring shape. The N pole of the magnetic steel ring 6 is located at the outer ring of the circular ring, and the S pole of the magnetic steel ring 6 is located at the inner ring of the circular ring.

[0028] In this embodiment, the cross-section of the pole shell 2 is U-shaped, the pole shell 2 is a permanent magnet, the S pole and the N pole of the pole shell 2 are both located on the side where the groove 20 is provided, the S pole of the pole shell 2 is located on the outside of the groove 20, and the N pole of the pole shell 2 is located on the inside of the groove 20.

[0029] like Figure 5 and Figure 6 As shown, the limiting magnetic field 8 formed by the magnetic flux lines generated by the magnetic pole shells 2 on both sides can limit the magnetic steel ring 6 in the magnetic pole shells 2, and the directions of the magnetic flux lines in the limiting magnetic field 8 generated by the magnetic pole shells 2 on both sides are opposite; the annular magnetic steel ring 6 is attracted by the limiting magnetic fields 8 on both sides at the same time, and the two magnetic forces offset each other, so that the magnetic steel ring 6 can be suspended in a balanced position between the magnetic pole shells 2 on both sides.

[0030] In actual use, the permanent magnet axial hybrid magnetic suspension bearing needs to cooperate with the displacement sensor to detect the position and posture of the rotor 1 in real time. Through the above design scheme, when the rotor 1 is displaced along the axial direction due to external disturbance, the displacement sensor detects the bias and feeds back to the controller. The controller controls the coil 5 to generate current to form a magnetic field. The bias magnetic flux lines pass through the left magnetic pole shell 2 and the left air gap 7 in sequence and enter the thrust plate inner ring 3, then pass through the right air gap 7 and enter the right magnetic pole shell 2. After coming out of the right magnetic pole shell 2, they pass through the right air gap 7, the thrust plate outer ring 4 and the left air gap 7 in sequence, and re-enter the left magnetic pole shell 2 to form a closed loop, that is, the correction magnetic field 9; the direction of the magnetic flux lines in the correction magnetic field 9 is controlled by the direction of the current, but no matter what the direction of the current is, the direction of the magnetic flux lines of the correction magnetic field 9 will always be the same as the direction of the magnetic flux lines of the limiting magnetic field 8 on one side.

[0031] Through the above design scheme, when the rotor 1 deviates to the left, the magnetic flux lines of the correcting magnetic field 9 generated by the coil 5 are in the same direction as the magnetic flux lines of the limiting magnetic field 8 on the right. At this time, the limiting magnetic field 8 on the left will be partially offset by the correcting magnetic field 9, while the limiting magnetic field 8 on the right will be enhanced by the correcting magnetic field 9, so that the traction force of the limiting magnetic field 8 on the left side on the magnetic steel ring 6 is reduced and the traction force of the limiting magnetic field 8 on the right side on the magnetic steel ring 6 is increased, so that the magnetic steel ring 6 drives the thrust plate to deviate to the right, and the thrust plate returns to the equilibrium position; when the rotor 1 deviates to the right, the magnetic flux lines of the correcting magnetic field 9 generated by the coil 5 are in the same direction as the magnetic flux lines of the limiting magnetic field 8 on the left, so that the magnetic steel ring 6 drives the thrust plate to deviate to the left, and the thrust plate returns to the equilibrium position.

[0032] The intensity of the correcting magnetic field 9 increases with the increase of the offset distance of the thrust plate.

[0033] In this embodiment, the coil 5 is wound by an enameled copper wire, the diameter of the enameled copper wire is between 0.1 mm and 1.25 mm, and the number of turns of the coil 5 is between 180 and 250. According to the size of the entire magnetic bearing and the size of the required control current, the designer can adjust the size of the copper wire to meet the control requirements; preferably, the diameter of the enameled copper wire is 0.5 mm, and the number of turns is 200.

[0034] In this embodiment, the pole shell 2 and the magnetic steel ring 6 are both made of permanent ferrite material. The pole shell 2 and the magnetic steel ring 6 require a long-term stable magnetic field to provide long-term bearing capacity. Permanent ferrite has smaller magnetic leakage and lower power consumption.

[0035] In this embodiment, a set of radial bearings 13 are disposed at both the front and rear ends of the rotor 1 , and an axial bearing 11 is disposed at the front end of the rotor 1 where the radial bearings 13 are mounted.

[0036] In this embodiment, a ball bearing 15 is installed between the rotor 1 and the motor housing 14 .

[0037] It should be noted that the permanent magnet axial hybrid magnetic bearing (i.e., axial bearing 11) designed in the present invention can be used not only in the motor of the present invention, but also as a contactless support for rotating parts in mechanical equipment such as fans, compressors, expanders, and pumps.

[0038] Through the above design scheme, the permanent magnet axial hybrid magnetic suspension bearing (i.e., the axial bearing 11) in the present invention is tested, and a current of 0A (downward) is applied to the coil 5 on the left side of the permanent magnet axial hybrid magnetic suspension bearing (i.e., the axial bearing 11), and a current of 5A (upward) is applied to the coil 5 on the right side of the permanent magnet axial hybrid magnetic suspension bearing (i.e., the axial bearing 11), and the performance test data shown in Table 1 are obtained: Table 1 Performance test data of permanent magnet axial hybrid magnetic bearing

[0039] It can be seen from Table 1 that when 0A (downward) is applied to the coil 5 on the left side of the permanent magnet axial hybrid magnetic suspension bearing and 5A (upward) is applied to the coil 5 on the right side of the permanent magnet axial hybrid magnetic suspension bearing, the Z-axis directional force is at least -518950N (positive and negative signs only represent the direction of the force), and the maximum is 927360N, and the total force is -98508000N. It can be seen that the permanent magnet axial hybrid magnetic suspension bearing used in the present invention can generate a Z-axis fixed force of several thousand Newtons to tens of millions of Newtons under different current configurations. It can be seen that the adjustment range of the permanent magnet axial hybrid magnetic suspension bearing is relatively wide. Under a current of 5A, the permanent magnet axial hybrid magnetic suspension bearing can generate a Z-axis directional force of tens of millions of Newtons. It can be seen that the force-current ratio is very high, and the direction of the current has a significant effect on the generation of force, so that the permanent magnet axial hybrid magnetic suspension bearing can achieve more flexible force adjustment by adjusting the current direction, and can adapt to scenes requiring higher control accuracy. The motor based on the permanent magnet axial hybrid magnetic suspension bearing in the present invention also has the above-mentioned effect.

[0040] To sum up, the motor based on permanent magnet axial hybrid magnetic suspension bearing provided by the present invention, compared with the prior art, the magnetic field generated by the pole shells 2 on both sides of the axial bearing can limit the magnetic steel ring 6, so that the thrust plate is located at the center of the two groups of pole shells 2; when the controller detects that the thrust plate is offset, the coil 5 is energized to generate a correcting magnetic field 9, so that the thrust plate returns to the center; because the magnetic circuit of the entire magnetic bearing has a ferromagnetic magnetic conductive magnetic circuit, the leakage magnetic flux is smaller, the power consumption is lower, and the overall structure is simpler and the cost is lower.

[0041] In the absence of conflict, the above-mentioned embodiments and features thereof may be combined with each other.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A motor based on a permanent magnet axial hybrid magnetic bearing, comprising a motor body, characterized in that: The motor body comprises a rotor (1), a stator (10), a motor housing (14), a radial bearing (13) and an axial bearing (11); the stator (10) is installed in the motor housing (14); a bearing seat (12) is provided on the motor housing (14); the bearing seat (12) is used to install the radial bearing (13) and the axial bearing (11); the rotor (1) is installed in the motor housing (14) via the radial bearing (13) and the axial bearing (11); The axial bearing (11) is a permanent magnet type axial hybrid magnetic suspension bearing. The axial bearing (11) comprises a magnetic pole shell (2), a magnetic steel ring (6) and a coil (5). A thrust disk is arranged on the rotor (1). The thrust disk comprises a thrust disk inner ring (3) and a thrust disk outer ring (4). The magnetic steel ring (6) is installed between the thrust disk inner ring (3) and the thrust disk outer ring (4). Magnetic pole shells (2) are arranged on both sides of the magnetic steel ring (6). Grooves (20) are provided in the magnetic pole shells (2) on both sides. The coil (5) is embedded in the groove (20). The depth of the groove (20) is consistent with the thickness of the coil (5). An air gap (7) is arranged between the magnetic pole shell (2) and the thrust disk. The width of the air gap (7) is H1, and 0.25 mm ≤ H1 ≤ 0.75 mm.

2. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1 is characterized in that: A displacement sensor is provided on the bearing seat (12), and the displacement sensor is used to detect the displacement of the thrust plate.

3. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1 is characterized in that: The thickness of the coil (5) is consistent with the thickness of the magnetic steel ring (6), and the thickness of the coil (5) and the magnetic steel ring (6) are both D1, 9mm≤D1≤12mm. The width of the coil (5) is H2, and the ratio of H2 to D1 is 1:

1. The width of the magnetic steel ring (6) is H3, and the ratio of H3 to D1 is 3:

2. The width of the magnetic steel ring (6) is consistent with the width of the thrust disk inner ring (3) and the width of the thrust disk outer ring (4).

4. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1 is characterized in that: The magnetic steel ring (6) is a permanent magnet and is in the shape of a ring. The N pole of the magnetic steel ring (6) is located at the outer ring of the ring, and the S pole of the magnetic steel ring (6) is located at the inner ring of the ring.

5. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1, characterized in that: The cross section of the magnetic pole shell (2) is U-shaped; the magnetic pole shell (2) is a permanent magnet; the S pole and the N pole of the magnetic pole shell (2) are both located on a side provided with the groove (20); the S pole of the magnetic pole shell (2) is located outside the groove (20); and the N pole of the magnetic pole shell (2) is located inside the groove (20).

6. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1, characterized in that: The coil (5) is wound by enameled copper wire, the diameter of the enameled copper wire is between 0.1 mm and 1.25 mm, and the number of turns of the coil (5) is between 180 and 250.

7. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1, characterized in that: The magnetic pole shell (2) and the magnetic steel ring (6) are both made of permanent magnetic ferrite material.

8. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1, characterized in that: A set of radial bearings (13) are provided at both the front and rear ends of the rotor (1), and an axial bearing (11) is provided at the front end of the rotor (1) where the radial bearings (13) are installed.

9. The motor based on permanent magnet axial hybrid magnetic bearing according to claim 1, characterized in that: A ball bearing (15) is installed between the rotor (1) and the motor housing (14).

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