High-speed magnetic suspension motor protection structure and magnetic suspension motor

Abstract

The utility model discloses a high-speed magnetic suspension motor protection structure and a magnetic suspension motor, the high-speed magnetic suspension motor protection structure comprises a motor casing, a motor rotor and a motor stator, the motor stator is fixedly installed on the inner side surface of the motor casing, and the motor rotor is arranged in the motor stator along the axis direction. The two ends of a rotating shaft of the motor rotor are rotatably installed on the motor shell through magnetic suspension bearings. And a magnetorheological elastomer is arranged between each magnetic suspension bearing and the rotating shaft of the motor rotor, and the magnetorheological elastomers are configured to buffer the falling stress of the motor rotor during high-speed rotation under the action of a magnetic field. According to the high-speed magnetic suspension motor protection structure, the magnetorheological elastomer is arranged between each magnetic suspension bearing and the rotating shaft of the motor rotor, and the magnetorheological elastomer can buffer the falling stress of the motor rotor during high-speed rotation under the action of a magnetic field, so that hard contact is avoided, the service life of the motor rotor is greatly prolonged, and the service life of the motor rotor is prolonged. And frequent maintenance is not needed.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic levitation, and particularly relates to a protection structure for a high-speed magnetic levitation motor and a magnetic levitation motor. Background Art

[0002] With the development of magnetic levitation technology, high-speed magnetic levitation motors are increasingly used in various industries. Traditional motors use mechanical bearings to support the rotating shaft, with relatively low rotational speeds. Generally, a gear mechanism is required to increase the speed, resulting in transmission losses and mechanical friction losses. In contrast, magnetic levitation motors use magnetic levitation bearings to support the rotating shaft, suspending the shaft in space using electromagnetic force, enabling high-speed operation, and featuring no mechanical friction, long lifespan, and low noise.

[0003] Currently, in order to prevent the rotor rotating at high speed from directly hitting the magnetic levitation bearing in the event of power failure or out-of-control, a structural design for protecting the bearing is required. The bearing protection needs to have high impact resistance. Currently, high-strength mechanical ball bearings are generally used.

[0004] Since the rotor rotating at high speed has extremely high kinetic energy when falling onto the protective bearing, and there is a fixed physical gap between the mechanical ball bearing and the rotor shaft, the falling process is a direct physical impact process without any buffering. Under the current technical level, the anti-impact lifespan of mechanical ball bearings is generally only 3 to 5 times. Therefore, multiple disassembly and assembly operations are required to maintain continuous operation. Moreover, mechanical ball bearings are generally designed as an integrated structure with magnetic bearings, resulting in relatively high disassembly and repair costs, which urgently need to be solved. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a protection structure for a high-speed magnetic levitation motor and a magnetic levitation motor, so as to solve the problem of low service life caused by hard contact in conventional mechanical roller bearings in the prior art.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, a protection structure for a high-speed magnetic levitation motor is provided, which includes a motor housing, a motor rotor, and a motor stator, wherein:

[0008] The motor stator is fixedly installed on the inner side surface of the motor housing. The motor rotor is arranged inside the motor stator along the axial direction. Both ends of the rotating shaft of the motor rotor are rotatably installed on the motor housing through magnetic levitation bearings;

[0009] A magnetorheological elastomer is arranged between each magnetic levitation bearing and the rotating shaft of the motor rotor. The magnetorheological elastomer is configured to buffer the stress of the motor rotor falling during high-speed rotation under the action of a magnetic field.

[0010] Furthermore, the magnetorheological elastomer includes an outer bearing ring, an inner bearing ring, and a carrier fluid, where:

[0011] The outer bearing ring is disposed around the inner bearing ring. A closed cavity is formed between the outer bearing ring and the inner bearing ring. The cavity is filled with the carrier fluid, and magnetic particles are uniformly dispersed in the carrier fluid. The magnetic particles in the carrier fluid attract each other under the action of an external magnetic field to form a plurality of elastic buffer units parallel to the external magnetic field in the circumferential direction of the cavity.

[0012] Furthermore, the plurality of elastic buffer units as a whole are in a columnar structure.

[0013] Furthermore, an installation groove is formed in the mounting bearing, and the plurality of elastic buffer units as a whole are in a chain-like structure.

[0014] Furthermore, an installation groove is formed on the side of the inner hole of each magnetic suspension bearing away from the motor stator. The magnetorheological elastomer is sleeved on the rotating shaft of the motor rotor through the inner bearing ring and is located in the installation groove.

[0015] Furthermore, an installation portion is provided at a position on the rotating shaft of the motor rotor corresponding to the motor stator, and a permanent magnet is attached to the installation portion.

[0016] Furthermore, a limiting groove is formed on the installation portion, and the permanent magnet is attached in the limiting groove.

[0017] In a second aspect, a magnetic suspension motor is provided, including the above-mentioned high-speed magnetic suspension motor protection structure.

[0018] Compared with the prior art, the beneficial effects of the high-speed magnetic suspension motor protection structure are as follows: By arranging a magnetorheological elastomer between each magnetic suspension bearing and the rotating shaft of the motor rotor, the magnetorheological elastomer can buffer the stress of the motor rotor falling during high-speed rotation under the action of a magnetic field, avoid hard contact, greatly improve the service life of the motor rotor, and eliminate the need for frequent maintenance; Through the cooperation of the outer bearing ring, the inner bearing ring, the carrier fluid, and the external magnetic field, the magnetic particles in the carrier fluid attract each other under the action of the external magnetic field to form a plurality of elastic buffer units parallel to the external magnetic field in the circumferential direction of the cavity, which occupies a small space and has a good buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the background art and the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0020] Figure 1 is a schematic structural diagram of the high-speed maglev motor protection structure provided by the embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the bearing protection member in the state without applying a magnetic field provided by the embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of the bearing protection member in the state of applying a magnetic field provided by the embodiment of the present invention. Detailed implementation manners

[0023] The following will further illustrate the technical solutions of the present invention in conjunction with the accompanying drawings and through specific implementation manners.

[0024] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant accompanying drawings. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation manner. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] Please refer to Figures 1 to 3As shown, in this embodiment, a protection structure for a high-speed maglev motor includes a motor housing 1, a motor rotor 2, and a motor stator 3, where: The motor stator 3 is fixedly installed on the inner side of the motor housing 1, the motor rotor 2 is arranged inside the motor stator 3 along the axial direction, and both ends of the rotating shaft of the motor rotor 2 are rotatably installed on the motor housing 1 through magnetic levitation bearings 4; A magnetorheological elastomer 5 is arranged between each magnetic levitation bearing 4 and the rotating shaft of the motor rotor 2, and the magnetorheological elastomer 5 is configured to buffer the stress of the motor rotor 2 dropping during high-speed rotation under the action of a magnetic field.

[0026] It can be seen that by arranging the magnetorheological elastomer 5 between each magnetic levitation bearing 4 and the rotating shaft of the motor rotor 2, the magnetorheological elastomer 5 can buffer the stress of the motor rotor 2 dropping during high-speed rotation under the action of a magnetic field, avoid hard contact, greatly improve the service life of the motor rotor 2, and eliminate the need for frequent maintenance.

[0027] As an implementation manner, the magnetorheological elastomer 5 includes an outer bearing ring 50, an inner bearing ring 51, and a carrier liquid 52, where: The outer bearing ring 50 is arranged on the periphery of the inner bearing ring 51, a closed cavity is formed between the outer bearing ring 50 and the inner bearing ring 51, the cavity is filled with the carrier liquid 52, magnetic particles 6 are uniformly dispersed in the carrier liquid 52, and the magnetic particles 6 in the carrier liquid 52 attract each other under the action of an external magnetic field to form a plurality of elastic buffer units parallel to the external magnetic field in the circumferential direction of the cavity.

[0028] It can be seen that through the cooperation of the outer bearing ring 50, the inner bearing ring 51, the carrier liquid 52, and the external magnetic field, the magnetic particles 6 in the carrier liquid 52 attract each other under the action of the external magnetic field to form a plurality of elastic buffer units parallel to the external magnetic field in the circumferential direction of the cavity, which occupies a small space and has a good buffering effect.

[0029] As an implementation manner, the overall structure of the plurality of elastic buffer units is a columnar structure.

[0030] Of course, as another implementation manner, the overall structure of the plurality of elastic buffer units can also be a chain-like structure.

[0031] As an implementation manner, an installation groove 40 is opened on one side of the inner hole of each magnetic levitation bearing 4 away from the motor stator 3, and the magnetorheological elastomer 5 is sleeved on the rotating shaft of the motor rotor 2 through the inner bearing ring 51 and is located in the installation groove 40.

[0032] As an implementation manner, an installation portion is provided at a position on the rotating shaft of the motor rotor 2 corresponding to the motor stator 3, and a magnetic steel 7 is attached to the installation portion.

[0033] As an implementation manner, a limiting groove 8 is provided on the installation portion, and the magnetic steel 7 is attached in the limiting groove 8.

[0034] Based on the above high-speed maglev motor protection structure, a maglev motor is provided, including the above high-speed maglev motor protection structure.

[0035] It should be noted that: the magnetorheological elastomer 5 is formed by incorporating ferromagnetic particles 6 on the micron scale into a polymer matrix and curing it in a magnetic field environment, so that the magnetic particles 6 in the matrix have a chain or columnar structure. The elastic modulus of this material can vary with the applied magnetic field strength, and thus it is expected to be widely used in variable stiffness devices and other aspects. Compared with ordinary magnetorheological fluids, the magnetorheological elastomer 5 not only has high-tech characteristics such as controllability, reversibility, and rapid response, but also has unique advantages such as good stability.

[0036] The present utility model utilizes the characteristic that the shear yield stress of the magnetorheological fluid changes under the action of a magnetic field, so as to achieve the purpose of active vibration reduction and shock control. When no magnetic field is applied, all the magnetic particles 6 are uniformly dispersed in the carrier liquid 52, and the rheological characteristics of the magnetorheological fluid are approximately those of a Newtonian fluid. At this time, the viscosity of the carrier liquid 52 is approximately a constant. When an external magnetic field is applied, the magnetic particles 6 are magnetized to generate magnetic forces, and under the action of the magnetic field, they attract each other to form a chain or columnar structure parallel to the direction of the external magnetic field. After removing the external magnetic field, the magnetic chain structure quickly collapses and returns to the isotropic Newtonian fluid state. This solidified magnetic chain structure makes the magnetorheological fluid under the magnetic field exhibit mechanical characteristics similar to those of a solid, and is prominently manifested as a yield behavior. To make the magnetorheological fluid under the magnetic field flow, microscopically, it is necessary to overcome the attraction between the particles in the magnetic chain structure (i.e., cut or break the magnetic chain structure), and macroscopically, it is manifested as the applied external force needs to reach a minimum shear stress value, that is, the shear yield stress.

[0037] Since the magnetic levitation bearing 4 itself requires magnetic field control, combined with the shock absorption stiffness and damping required for the rotor to drop at different speeds, the corresponding magnetic field is controlled and provided by the magnetic levitation bearing controller, and the real-time active shock absorption response of protecting the bearing can be achieved.

[0038] The above embodiments only illustrate the basic principles and characteristics of the present utility model. The present utility model is not limited by the above examples. Without departing from the spirit and scope of the present utility model, there are various changes and modifications to the present utility model, and these changes and modifications all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A protection structure for a high-speed maglev motor, characterized in that The high-speed maglev motor protection structure includes a motor housing, a motor rotor, and a motor stator, where: The motor stator is fixedly installed on the inner side of the motor housing. The motor rotor is arranged inside the motor stator along the axial direction, and both ends of the rotating shaft of the motor rotor are rotatably installed on the motor housing through magnetic levitation bearings; A magnetorheological elastomer is arranged between each magnetic levitation bearing and the rotating shaft of the motor rotor, and the magnetorheological elastomer is configured to buffer the stress of the motor rotor falling during high-speed rotation under the action of a magnetic field.

2. The protection structure of the high-speed maglev motor according to claim 1, characterized in that, The magnetorheological elastomer includes an outer bearing ring, an inner bearing ring, and a carrier liquid, where: The outer bearing ring is arranged on the periphery of the inner bearing ring. A closed cavity is formed between the outer bearing ring and the inner bearing ring. The cavity is filled with the carrier liquid, and magnetic particles are uniformly dispersed in the carrier liquid. The magnetic particles in the carrier liquid attract each other under the action of an external magnetic field to form a plurality of elastic buffer units parallel to the external magnetic field in the circumferential direction of the cavity.

3. The high-speed maglev motor protection structure according to claim 2, wherein, The plurality of elastic buffer units as a whole are columnar structures.

4. The protection structure of the high-speed maglev motor according to claim 2, characterized in that, The plurality of elastic buffer units as a whole are chain-like structures.

5. The protection structure of the high-speed maglev motor according to claim 2, characterized in that, An installation groove is provided on one side of the inner hole of each magnetic levitation bearing away from the motor stator. The magnetorheological elastomer is sleeved on the rotating shaft of the motor rotor through the inner bearing ring and is located in the installation groove.

6. The protection structure of the high-speed maglev motor according to claim 1, characterized in that An installation part is provided on the rotating shaft of the motor rotor corresponding to the position of the motor stator, and a magnetic steel is attached to the installation part.

7. The protection structure of the high-speed maglev motor according to claim 6, characterized in that, A limiting groove is provided on the installation part, and the magnetic steel is attached in the limiting groove.

8. A magnetic levitation motor, characterized in that, The maglev motor includes the high-speed maglev motor protection structure according to any one of claims 1 to 7.

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