Radial load biasing condition simulation and measurement device for permanent magnet thrust bearing

Abstract

A radial eccentric load working condition simulation and measurement device for a permanent magnet thrust bearing belongs to the technical field of permanent magnet thrust bearing detection. A three-way force sensor in the device is connected with a radial sliding platform, a stator base is fixed on the radial sliding platform, the stator base is fixedly connected with a permanent magnet stator, and a permanent magnet rotor is in contact with the permanent magnet stator. The radial sliding platform is fixed on a working platform to drive the permanent magnet stator to move radially. The radial force is measured by the three-way force sensor under the eccentric load condition, and the radial offset distance is recorded by the radial sliding platform. The permanent magnet rotor is connected with a rotor main shaft, both ends of the rotor main shaft are in contact with sliding bearings, and the sliding bearings are fixedly connected with a sliding bearing support. An electric cylinder is in contact with the rotor main shaft in the initial state and is in contact with the rotor main shaft in the working state. The device can simulate the radial eccentric load working condition of the permanent magnet bearing, simultaneously realize the loading of the axial force under the radial eccentric load working condition, measure the axial force and the radial force through the sensor, and quantify the relationship between the axial bearing capacity and the radial eccentric load of the permanent magnet thrust bearing.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet thrust bearing testing technology, and relates to a radial off-center load simulation and measurement device, particularly a radial off-center load simulation and measurement device for permanent magnet thrust bearings. Background Technology

[0002] Thrust bearings are crucial mechanical components in traditional transmission systems. However, due to mechanical contact, friction occurs at the bearing, resulting in significant energy loss and reduced overall transmission system efficiency. Permanent magnet thrust bearings, while meeting the performance requirements of thrust bearings, achieve rotor levitation through magnetic field interaction, eliminating mechanical wear and significantly improving transmission efficiency. The working principle of a permanent magnet thrust bearing is as follows: under external load, the rotor and the magnetic array on the stator undergo relative displacement, generating a magnetic thrust that drives the rotor to its equilibrium position. Ideally, the rotor and stator of the permanent magnet bearing are aligned. When the permanent magnet thrust bearing is radially disturbed, it affects the axial load capacity and causes radial instability. Therefore, the radial stiffness of the permanent magnet thrust bearing is crucial. By establishing a quantitative mapping relationship between the radial off-center load and the radial offset parameter, the optimized design of the permanent magnet thrust bearing can be further guided, thereby improving its mechanical performance.

[0003] In permanent magnet thrust bearings, the rotor and stator are in a non-contact state. During axial mechanical performance testing, the stator must be fixed, and the rotor's ends are fixed by sliding bearings to limit radial displacement. The axial force and displacement of the rotor are measured using a pressure cylinder and displacement sensors. However, this structure makes it difficult to simulate radial off-center loading conditions by moving the rotor. Furthermore, the rotor itself has gravity, which affects the magnetic force generated by the magnetic field itself during vertical off-center loading simulations. This makes it difficult to accurately measure the radial force generated by radial offset conditions.

[0004] Therefore, there is an urgent need to design a device for simulating and measuring the radial off-center load condition of permanent magnet thrust bearings to meet the requirements of static mechanical performance testing under off-center load conditions. To address the needs of university research projects, this invention discloses a device for simulating and measuring the radial off-center load condition of permanent magnet thrust bearings. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a device for simulating and measuring radial off-center load conditions of permanent magnet thrust bearings. It can simulate the radial off-center load conditions of permanent magnet bearings and simultaneously apply axial force under radial off-center load conditions. The axial force and radial force are measured by sensors to quantify the relationship between the axial bearing capacity and the radial off-center load force of the permanent magnet thrust bearing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings, comprising a rotor main shaft 1, a permanent magnet rotor 3, a sliding bearing 7, a permanent magnet stator 2, a stator base 4, a triaxial force sensor 5, a radial sliding platform 6, an electric cylinder 8, a sliding bearing support 9, and an electric cylinder support 10; wherein the rotor main shaft 1 is composed of a main shaft section 101, a connecting shaft section 104, a secondary shaft section 105, a spline 102, and a preload bolt 103, and the radial sliding platform 6 is composed of a drive motor 601, a slide rail support platform 602, and a slide rail module 603.

[0007] The triaxial force sensor 5 is connected to the slide rail support platform 602 of the radial sliding platform 6. The stator base 4 is fixed to the triaxial force sensor 5 by bolts. The stator base 4 is fixed to the permanent magnet stator 2 by bolts. The permanent magnet rotor 3 has no contact with the permanent magnet stator 2. This part is a key component of this device. The radial sliding platform 6 is fixed to the working platform. The slide rail support platform 602 at the upper end of the radial sliding platform 6 drives the entire permanent magnet stator 2 to move radially. Under off-center load, a radial magnetic force is generated between the permanent magnet rotor 3 and the permanent magnet stator 2. The radial force is measured by the triaxial force sensor 5, and the radial offset distance is recorded by the radial sliding platform 6. The permanent magnet rotor 3 is connected to the main shaft section 101 of the rotor main shaft 1 by bolts. The auxiliary shaft sections 105 at both ends of the rotor main shaft 1 are in contact with the inner rings of the sliding bearings 7 at both ends. The sliding bearings 7 and the sliding bearing supports 9 are fixed by bolts. The sliding bearing supports 9 are fixed to the working platform by bolts to realize the axial free movement of the permanent magnet rotor 3 as a whole, while restricting the radial movement of the permanent magnet rotor 3 as a whole. The electric cylinder 8 is fixed to the electric cylinder support 10 by bolts. The electric cylinder support 10 is fixed to the working platform by bolts. The electric cylinder 8 and the rotor main shaft 1 are not in contact in the initial state. In the working state, the electric cylinder 8 is in contact with the rotor main shaft 1. Under the action of the thrust of the electric cylinder 8, the permanent magnet rotor 3 is moved axially.

[0008] Furthermore, the radial sliding platform 6 is an electrically driven sliding platform, mainly composed of a drive motor 601, a slide rail support platform 602, and a slide rail module 603. The drive motor 601 is operated by a motor control platform, controlling the radial movement of the slide rail module 603. While moving radially, the slide rail module 603 feeds back its real-time position to the motor control platform. The slide rail support platform 602 is located above the slide rail module 603 and has multiple threaded holes for bolt-fixed connection with the triaxial force sensor 5. The slide rail support platform 602 can drive the triaxial force sensor 5 to move. The lower base of the radial sliding platform 6 includes multiple through holes, through which bolts can be passed and fixed to the working platform.

[0009] Furthermore, the lower end face of the triaxial force sensor 5 includes multiple through holes, which are fixedly connected to the slide rail support platform 602 at the upper end of the radial sliding platform 6 by bolts; the upper end face of the triaxial force sensor 5 includes multiple threaded holes for fixing to the stator base 4 by bolts. The triaxial force sensor 5 is used to measure axial, radial, and vertical forces. The vertical force can measure the weight of the permanent magnet stator 2 and the stator base 4, the axial force can measure the axial force generated by the permanent magnet rotor 3 and the permanent magnet stator 2, and the radial force can measure the radial force generated by the permanent magnet rotor 3 and the permanent magnet stator 2.

[0010] Furthermore, the stator base 4 is used to fix the permanent magnet stator 2. Its lower end face includes multiple through holes, and bolts are fixedly connected to the threaded holes on the upper end face of the triaxial force sensor 5 through the through holes. The upper end face of the stator base 4 includes multiple threaded holes for fixing to the mounting surfaces at both ends of the permanent magnet stator 2. The stator base 4 is provided with reinforcing ribs on both sides to prevent the permanent magnet rotor 3 and the permanent magnet stator 2 from deforming due to axial movement or radial offset.

[0011] Furthermore, the rotor spindle 1, in order to facilitate the fixed installation of the permanent magnet rotor 3 and the installation of the sliding bearing 7, is composed of a main shaft section 101, a connecting shaft section 104, a secondary shaft section 105, a spline 102, and a preload bolt 103. Specifically, the main shaft section 101 is connected to the connecting shaft section 104 on both sides, and the connecting shaft section 104 is connected to the secondary shaft section 105 by bolts. The middle part of the main shaft section 101 is provided with a spline groove and a mounting plate, which is used to install the permanent magnet rotor 3. Spline grooves are respectively opened on both sides of the main shaft section 101, and it is fixed to the flange of the connecting shaft section 104 by splines 102 and pre-tightening bolts 103. The connecting shaft section 104 is an integrated structure, consisting of a flange and a cylindrical shaft section. The flange of the connecting shaft section 104 is fixedly connected to the flange of the auxiliary shaft section 105 by bolts. The auxiliary shaft section 105 consists of a shaft section and a flange, wherein the shaft section contacts the inner ring of the interactive bearing 7 to ensure the free movement of the rotor main shaft 1 in the axial direction.

[0012] Furthermore, the inner ring of the sliding bearing 7 contacts the secondary shaft section 105 of the rotor main shaft 1, ensuring that the rotor main shaft 1 can move freely axially; the sliding bearing 7 and the sliding bearing support 9 are fixed by bolts; the lower end of the sliding bearing support 9 is provided with a through hole, which can be fixed to the working platform by bolts; the sliding bearing 7 and the sliding bearing support 9 provide support points at both ends of the rotor main shaft 1, restricting the radial movement of the rotor main shaft 1 and ensuring the axial free movement of the rotor shaft 1. The height of the sliding bearing support 7 is the distance from the rotor main shaft 1 to the working platform minus the distance from the central axis of the sliding bearing 7 to the bottom end face of the sliding bearing 7.

[0013] Furthermore, the electric cylinder 8 can provide axial thrust to the permanent magnet thrust bearing, so that the electric cylinder thrust and the axial magnetic force generated by the permanent magnet bearing are balanced. The lower end face of the electric cylinder 8 is provided with a through hole, which is fixedly connected to the electric cylinder support 10 by bolts; the lower end of the electric cylinder support 10 is provided with a through hole, which can be fixed to the platform by bolts. The electric cylinder 8 can provide thrust for the permanent magnet bearing under centering conditions, and can also provide thrust when the permanent magnet stator is radially offset, that is, axial thrust under off-center load conditions. The height of the electric cylinder support 10 is the distance from the rotor main shaft 1 to the working platform minus the distance from the center axis of the electric cylinder 8 to the bottom end face of the electric cylinder 8.

[0014] The beneficial effects of this invention are as follows: In permanent magnet thrust bearings, the rotor and stator are in a non-contact state. During axial mechanical performance testing, the stator end must be fixed, and the rotor ends are fixed with sliding bearings to limit radial displacement. A cylinder and displacement sensor are used to measure the rotor's axial force and displacement. However, this structure makes it difficult to simulate radial off-center loading conditions by moving the rotor. The device of this invention achieves overall movement of the permanent magnet stator 2 via a radial sliding platform 6. The device connects the permanent magnet stator 2 to the stator base 4 with bolts, and connects the stator base 4 to a triaxial force sensor 5. The triaxial force sensor 5 can measure axial, radial, and vertical forces. The device fixes the triaxial force sensor 5 to the radial sliding platform 6, which is then fixed to the working plane, enabling simulation of different radial off-center loading conditions. Simultaneously, under the thrust of the electric cylinder 8, the rotor spindle 1 drives the permanent magnet rotor 3 to move axially, simulating off-center loading conditions under different axial thrusts.

[0015] The device of this invention can establish a quantitative mapping relationship between the radial off-center load force and the radial offset parameter of the bearing, which can further guide the optimized design of permanent magnet thrust bearings and thus improve the mechanical performance of magnetic bearings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a radial force measuring device for permanent magnet thrust bearings. Figure 2 This is a front view of a radial force measuring device used in permanent magnet thrust bearings; Figure 3 This is a schematic diagram of the main structure of a radial force measuring device for permanent magnet thrust bearings; Figure 4 This is an exploded view of the rotor spindle of a permanent magnet thrust bearing; Figure 5 This is a partial cross-sectional view of the rotor spindle of the permanent magnet thrust bearing.

[0017] In the diagram: 1 Rotor spindle; 2 Permanent magnet stator; 3 Permanent magnet rotor; 4 Stator base; 5 Triaxial force sensor; 6 Radial sliding platform; 7 Sliding bearing; 8 Electric cylinder; 9 Sliding bearing support; 10 Electric cylinder support; 101 Main shaft section; 102 Spline; 103 Preload bolt; 104 Connecting shaft section; 105 Sub-shaft section; 601 Drive motor; 602 Slide rail support platform; 603 Slide rail module. Detailed Implementation

[0018] In view of this, the present invention discloses a device for simulating and measuring radial off-center load conditions of permanent magnet thrust bearings. It can simulate the radial off-center load conditions of permanent magnet bearings and simultaneously apply axial force under radial off-center load conditions. The axial force and radial force are measured by sensors to quantify the relationship between the axial bearing capacity and the radial off-center load force of permanent magnet thrust bearings.

[0019] To achieve the above objectives, the present invention adopts the following technical solution: As attached Figure 1 A device for simulating and measuring radial off-center load conditions in permanent magnet thrust bearings is characterized by comprising a rotor spindle 1, a permanent magnet rotor 3, a sliding bearing 7, a permanent magnet stator 2, a stator base 4, a triaxial force sensor 5, a radial sliding platform 6, an electric cylinder 8, a sliding bearing support 9, and an electric cylinder support 10. The radial sliding platform 6 and the triaxial force sensor 5 are fixed with bolts, and the stator base 4 is fixed to the triaxial force sensor 5 with bolts. The stator base 4 is also fixed to the permanent magnet stator 2 with bolts. The permanent magnet rotor 3 has no contact with the permanent magnet stator 2; this part is a key component of the device. The radial sliding platform 6 is fixed to a working platform, and the entire permanent magnet stator 2 is moved radially by the radial sliding platform 6. Under off-center load conditions, a radial magnetic force is generated between the permanent magnet rotor 3 and the permanent magnet stator 2. The radial force is measured by the triaxial force sensor 5, and the radial offset distance is recorded by the radial sliding platform 6. The rotor spindle 1 and the permanent magnet rotor 3 are connected by bolts. The rotor spindle 1 is in contact with the inner rings of the sliding bearings 7 at both ends. The sliding bearings 7 and the sliding bearing supports 9 are fixed by bolts, and the sliding bearing supports 9 are fixed to the working platform to achieve free axial movement of the permanent magnet rotor 3 as a whole, while restricting the radial movement of the permanent magnet rotor 3 as a whole. The electric cylinder 8 and the electric cylinder support 10 are fixed by bolts, and the electric cylinder support 10 is fixed to the working platform. The electric cylinder 8 and the rotor spindle 1 are not in contact in the initial state. In the working state, the electric cylinder 8 is in contact with the rotor spindle 1, and the axial movement of the permanent magnet rotor 3 is achieved under the action of the thrust of the electric cylinder 8.

[0020] As attached Figure 3The stator base 4 is used to fix the permanent magnet stator 2. Its lower end face includes multiple through holes, and bolts are fixedly connected to the threaded holes on the upper end face of the triaxial force sensor 5 through the through holes. The upper end face of the stator base 4 includes multiple threaded holes for fixing to the mounting surfaces at both ends of the permanent magnet stator 2. The stator base 4 is provided with reinforcing ribs on both sides to prevent the permanent magnet rotor 3 and the permanent magnet stator 2 from being deformed due to axial movement or radial offset.

[0021] As attached Figure 3 The triaxial force sensor 5 can measure forces in the range of 10 kN. Its lower end face includes multiple through holes, which are fixedly connected to the slide rail support platform 602 at the upper end of the radial sliding platform 6 by bolts. The upper end face of the triaxial force sensor 5 includes multiple threaded holes for fixing to the stator base 4 by bolts. The triaxial force sensor 5 is used to measure axial, radial, and vertical forces. The vertical force can measure the weight of the permanent magnet stator 2 and the stator base 4, the axial force can measure the axial force generated by the permanent magnet rotor 3 and the permanent magnet stator 2, and the radial force can measure the radial force generated by the permanent magnet rotor 3 and the permanent magnet stator 2.

[0022] As attached Figure 3 The radial sliding platform 6 is an electrically driven sliding platform capable of applying a radial off-center load of 8 kN and simultaneously achieving radial movement within the range of -10 mm to 10 mm. The radial sliding platform 6 mainly consists of a drive motor 601, a slide rail support platform 602, and a slide rail module 603. The drive motor 601 is operated by a motor control platform, controlling the radial movement of the slide rail module 603. While moving radially, the slide rail module 603 feeds back its real-time position to the motor control platform. The slide rail support platform 602 is located above the slide rail module 603 and has multiple threaded holes for bolt-fixed connection with the triaxial force sensor 5. The slide rail support platform 602 can drive the triaxial force sensor 5 to move. The lower base of the radial sliding platform 6 includes multiple through holes, through which bolts can be passed and fixed to the working platform.

[0023] As attached Figure 4 Appendix Figure 5The rotor spindle 1, in order to facilitate the fixed installation of the permanent magnet rotor 3 and the installation of the sliding bearing, is composed of a main shaft section 101, a connecting shaft section 104, a secondary shaft section 105, a spline 102, and a preload bolt 103. Specifically, the main shaft section 101 is connected to the connecting shaft section 104 on both sides, and the connecting shaft section 104 is connected to the secondary shaft section 105 by bolts. The middle part of the main shaft section 101 is provided with a spline groove and a mounting plate, which is used to install the permanent magnet rotor 3. Spline grooves are respectively opened on both sides of the main shaft section 101, and it is fixed to the flange of the connecting shaft section 104 by splines 102 and pre-tightening bolts 103. The connecting shaft section 104 is an integrated structure, consisting of a flange and a cylindrical shaft section. The flange of the connecting shaft section 104 is fixedly connected to the flange of the auxiliary shaft section 105 by bolts. The auxiliary shaft section 105 consists of a shaft section and a flange, wherein the shaft section contacts the inner ring of the interactive bearing 7 to ensure the free movement of the rotor main shaft 1 in the axial direction.

[0024] As attached Figure 2 The sliding bearing 7 is an ST6 type bearing (other types of sliding bearings may also be used). Its inner ring contacts the auxiliary shaft section 105 of the rotor main shaft 1, ensuring that the rotor main shaft 1 can move freely axially. The sliding bearing 7 and the sliding bearing support 9 are fixed by bolts. The lower end of the sliding bearing support 9 is provided with a through hole, which can be fixed to the working platform by bolts. The sliding bearing 7 and the sliding bearing support 9 provide support points at both ends of the rotor main shaft 1, restricting the radial movement of the rotor main shaft 1 and ensuring the axial free movement of the rotor shaft 1. The height of the sliding bearing support 7 is the distance from the rotor main shaft 1 to the working platform minus the distance from the central axis of the sliding bearing 7 to the bottom surface of the sliding bearing 7.

[0025] As attached Figure 2 The electric cylinder 8 can provide 10 kN of axial thrust to the permanent magnet thrust bearing, so that the thrust of the electric cylinder and the axial magnetic force generated by the permanent magnet bearing are balanced. The lower end face of the electric cylinder 8 is provided with a through hole, which is fixedly connected to the electric cylinder support 10 by bolts. The lower end of the electric cylinder support 10 is provided with a through hole, which can be fixed to the platform by bolts. The electric cylinder 8 can provide thrust for the permanent magnet bearing under the centering condition, and can also provide thrust when the permanent magnet stator is radially offset, that is, axial thrust under the off-center load condition. The height of the electric cylinder support 10 is the distance from the rotor main shaft 1 to the working platform minus the distance from the center axis of the electric cylinder 8 to the bottom end face of the electric cylinder 8.

[0026] The usage process of the radial off-center load simulation and measurement device provided in this embodiment is as follows: First, fix the radial sliding platform 6, sliding bearing base 9 and electric cylinder base 10 of this device to the working plane. Then, install the triaxial force sensor 5, stator base 4 and permanent magnet stator 2 in sequence. Install and fix the sliding bearing 7 and permanent magnet rotor 3 to the rotor spindle. Fix the sliding bearing 7 to the sliding bearing base 9 and fix the electric cylinder 8 to the electric cylinder base 10.

[0027] In the initial state, the eccentric load condition is simulated: the drive motor 601 that drives the radial sliding platform 6 works, and drives the slide rail support platform 602 to move radially through the slide rail module 603. The slide rail support platform 602 will drive the permanent magnet stator 2 to move radially as a whole. When the permanent magnet rotor 3 and the permanent magnet stator 2 are radially offset, a radial magnetic force will be generated. The generated radial force can be measured by the triaxial force sensor 5.

[0028] Simulating off-center loading under axial loading: The electric cylinder 8 is driven to work, and the electric cylinder 8 pushes the rotor main shaft 1 to move axially. The rotor main shaft 1 drives the permanent magnet rotor 3 to move axially as a whole. When the permanent magnet rotor 3 and the permanent magnet stator 2 are axially offset, an axial force is generated. At this time, it is an axial loading state. Under this state, the drive motor 601 that drives the radial sliding platform 6 works, and drives the slide rail support platform 602 to move radially through the slide rail module 603. The slide rail support platform 602 will drive the permanent magnet stator 2 to move radially as a whole. When the permanent magnet rotor 3 and the permanent magnet stator 2 are radially offset, a radial magnetic force is generated. The axial force and radial force generated can be measured by the triaxial force sensor 5.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for simulating and measuring radial off-center load conditions in permanent magnet thrust bearings, characterized in that, The radial off-center load simulation and measurement device includes a rotor spindle (1), a permanent magnet rotor (3), a sliding bearing (7), a permanent magnet stator (2), a stator base (4), a triaxial force sensor (5), a radial sliding platform (6), an electric cylinder (8), a sliding bearing support (9), and an electric cylinder support (10); wherein the rotor spindle (1) includes a main shaft section (101), a connecting shaft section (104), a secondary shaft section (105), a spline (102), and a preload bolt (103); the radial sliding platform (6) includes a drive motor (601), a slide rail support platform (602), and a slide rail module (603); The triaxial force sensor (5) is connected to the slide rail support platform (602) of the radial sliding platform (6). The stator base (4) is fixed on the triaxial force sensor (5). The stator base (4) is fixedly connected to the permanent magnet stator (2). The permanent magnet rotor (3) has no contact with the permanent magnet stator (2). The radial sliding platform (6) is fixed to the working platform. The entire permanent magnet stator (2) is driven to move radially through the slide rail support platform (602) at the upper end of the radial sliding platform (6). Under the off-center load, a radial magnetic force is generated between the permanent magnet rotor (3) and the permanent magnet stator (2). The radial force is measured by the triaxial force sensor (5). The radial offset distance is recorded by the radial sliding platform (6). The permanent magnet rotor (3) is connected to the main shaft section (101) of the rotor main shaft (1). The auxiliary shaft sections (105) at both ends of the rotor main shaft (1) are in contact with the inner rings of the sliding bearings (7) at both ends. The sliding bearings (7) are fixedly connected to the sliding bearing support (9). The sliding bearing support (9) is fixed to the working platform, realizing the axial free movement of the permanent magnet rotor (3) as a whole, while restricting the radial movement of the permanent magnet rotor (3) as a whole. The electric cylinder (8) is fixedly connected to the electric cylinder support (10). The electric cylinder support (10) is fixed to the working platform. The electric cylinder (8) and the rotor main shaft (1) are not in contact in the initial state. In the working state, the electric cylinder (8) is in contact with the rotor main shaft (1). Under the action of the electric cylinder (8), the permanent magnet rotor (3) moves axially.

2. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 1, characterized in that, The radial sliding platform (6) is an electrically driven sliding platform, including a drive motor (601), a slide rail support platform (602), and a slide rail module (603). The drive motor (601) is operated by the motor control platform. The drive motor (601) controls the radial movement of the slide rail module (603). While the slide rail module (603) moves radially, it will feed back the real-time position to the motor control platform. The slide rail support platform (602) is located above the slide rail module (603). It has multiple threaded holes for fixed connection with the triaxial force sensor (5). The slide rail support platform (602) can drive the triaxial force sensor (5) to move.

3. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 2, characterized in that, The lower base of the radial sliding platform (6) includes multiple through holes, through which bolts are passed and fixed to the working platform.

4. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 3, characterized in that, The stator base (4) is used to fix the permanent magnet stator (3). Its lower end face includes multiple through holes. The bolts are fixedly connected to the threaded holes on the upper end face of the triaxial force sensor (5) through the through holes. The upper end face of the stator base (4) includes multiple threaded holes for fixing to the mounting surfaces at both ends of the permanent magnet stator (2).

5. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 4, characterized in that, The stator base (4) is provided with reinforcing ribs on both sides to prevent the permanent magnet rotor (3) and the permanent magnet stator (2) from being subjected to force after axial movement or radial displacement, which would cause deformation of the stator base (4) structure.

6. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 5, characterized in that, The rotor spindle (1) is used to fix and install the permanent magnet rotor (3) and the sliding bearing (7). It consists of a main shaft section (101), a connecting shaft section (104), a secondary shaft section (105), a spline (102), and preload bolts (103). Specifically, the two sides of the main shaft section (101) are connected to the connecting shaft section (104), and the connecting shaft section (104) is connected to the secondary shaft section (105) by bolts. The middle part of the main shaft section (101) is provided with a spline groove and a mounting plate for installing the permanent magnet rotor (3). Spline grooves are opened on both sides of the main shaft section (101), and it is fixed to the flange of the connecting shaft section (104) by splines (102) and pre-tightening bolts (103); the connecting shaft section (104) is an integrated structure, consisting of a flange and a cylindrical shaft section, and the flange of the connecting shaft section (104) is fixedly connected to the flange of the secondary shaft section (105) by bolts; the secondary shaft section (105) consists of a shaft section and a flange, wherein the shaft section contacts the inner ring of the interactive bearing (7) to ensure the free movement of the rotor main shaft (1) in the axial direction.

7. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 6, characterized in that, The inner ring of the sliding bearing (7) contacts the secondary shaft section (105) of the rotor main shaft (1), ensuring that the rotor main shaft (1) can move freely axially; the sliding bearing (7) and the sliding bearing support (9) are fixed by bolts; the lower end of the sliding bearing support (9) is provided with a through hole, which is fixed to the working platform by bolts; the sliding bearing (7) and the sliding bearing support (9) provide support points at both ends of the rotor main shaft (1), restricting the radial movement of the rotor main shaft (1) and ensuring that the rotor shaft (1) moves freely axially.

8. The device for simulating and measuring radial off-center load conditions for permanent magnet thrust bearings according to claim 7, characterized in that, The height of the sliding bearing support (7) is the distance from the rotor spindle (1) to the working platform minus the distance from the central axis of the sliding bearing (7) to the bottom surface of the sliding bearing (7).

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