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CN-117145865-B - Five-degree-of-freedom integrated hybrid magnetic bearing with novel structure

CN117145865BCN 117145865 BCN117145865 BCN 117145865BCN-117145865-B

Abstract

The invention discloses a five-degree-of-freedom integrated hybrid magnetic bearing with a novel structure, which solves the technical problems that the traditional five-degree-of-freedom integrated hybrid magnetic bearing shares bias magnetic flux in the radial direction and the axial direction and the parameters in the axial direction are mutually restricted. The magnetic isolation ring for the hybrid magnetic bearing divides a rotor core into radial and axial parts, wherein two radial stator cores, six permanent magnets and the radial part of the rotor core form a radial magnetic circuit, and the axial stator cores, two annular permanent magnets, two L-shaped cores and the axial part of the rotor core form an axial magnetic circuit. The five-degree-of-freedom integrated hybrid magnetic bearing with the novel structure provided by the invention has the advantages of no coupling of axial and radial magnetic circuits, no correlation between radial and axial parameters, short axial magnetic circuit, small rotor inertia, light weight, high response speed, simple control, easiness in realization, small magnetic leakage and low power consumption.

Inventors

  • ZHOU JI

Assignees

  • 江苏杰尔仕实业有限公司
  • 淮阴工学院

Dates

Publication Date
20260512
Application Date
20230911

Claims (5)

  1. 1. A novel-structure five-degree-of-freedom integrated hybrid magnetic bearing is characterized by comprising a stator and a rotor, wherein the stator comprises an axial stator core (1), two radial stator cores (2, 3), left and right L-shaped iron cores (4, 5) and left and right annular permanent magnets (6, 7), the two radial stator cores (2, 3) are symmetrically arranged inside the axial stator core (1), the left and right L-shaped iron cores (4, 5) and the left and right annular permanent magnets (6, 7) are symmetrically arranged outside the axial stator core (1) respectively, symmetrical axial control coils (8, 9) are wound on the inner side of the axial stator core (1), 3 control magnetic poles (10, 11) and 3 bias magnetic poles (12, 13) are uniformly distributed on the inner circumference of the radial stator core (2, 3), the radial control coils (14, 15) are wound on the control magnetic poles (10, 11), the bias magnetic poles (12, 13) are provided with permanent magnets (16, 17), the rotor is arranged inside the stator, is respectively provided with a rotating shaft (18), a rotor axial iron core (19), a pair of magnet rings (20) and a rotor core (21, a pair of rotor cores (21, a rotor core (20) are axially separated from the rotor core (20) and a pair of rotor cores (21, a pair of rotor cores (20) are axially separated from the rotor core (20) by a radial control magnetic rings (20) and the axial iron cores (20) which are axially separated from the rotor core (20) in a pair of the axial iron cores (20), radial air gaps (23, 24) are formed between the inner side of the axial stator core (1) and the left and right L-shaped iron cores (4, 5) extend into the rotor, and upper axial air gaps (25, 26) and lower axial air gaps (27, 28) are formed between the inner side of the axial stator core and the rotor axial iron core (19).
  2. 2. The five-degree-of-freedom integrated hybrid magnetic bearing with the novel structure according to claim 1 is characterized in that the polarities of the connecting surfaces of the left annular permanent magnet (6) and the right annular permanent magnet (7) and the axial stator core (1) are the same.
  3. 3. A five-degree-of-freedom integrated hybrid magnetic bearing of new construction according to claim 1, characterized in that the permanent magnets (16, 17) generate radial bias magnetic fluxes (29, 30), the radial bias magnetic fluxes (29, 30) form a closed path between the control poles (10, 11), the bias poles (12, 13), the radial air gaps (23, 24), the rotor radial cores (21, 22), the left and right annular permanent magnets (6, 7) generate axial bias magnetic fluxes (31, 32), the axial bias magnetic fluxes (31, 32) form a closed path between the axial stator cores (1), the left and right L-cores (4, 5), the rotor axial cores (19), the upper axial air gaps (25, 26) and the lower axial air gaps (27, 28).
  4. 4. The five-degree-of-freedom integrated hybrid magnetic bearing with the novel structure according to claim 1 is characterized in that axial control coils (8, 9) are connected in parallel and connected in series to form an axial suspension winding, a direct current switch power amplifier is used for driving, an axial control magnetic flux (33) is generated, a closed path is formed among an axial stator core (1), upper axial air gaps (25, 26) and a rotor axial core (19), radial control coils (14, 15) are respectively connected in a star shape, two three-phase inverters are used for driving to generate radial control magnetic fluxes (34, 35), and a closed path is formed among three control magnetic poles (10, 11), radial air gaps (23, 24) and rotor radial cores (21, 22).
  5. 5. The five-degree-of-freedom integrated hybrid magnetic bearing with the novel structure according to claim 1, wherein the left annular permanent magnet (6) and the right annular permanent magnet (7) and the permanent magnets (16) and (17) are made of rare earth permanent magnet materials, the magnetism isolating ring (20) is made of aluminum, the two radial stator cores (2 and 3) and the rotor radial cores (21 and 22) are formed by laminating silicon steel sheets, and the rotor axial core (19), the axial stator core (1) and the left L-shaped cores (4 and 5) are integrally processed by adopting magnetic conduction materials, and the rotating shaft (18) is made of non-magnetic conduction materials.

Description

Five-degree-of-freedom integrated hybrid magnetic bearing with novel structure Technical Field The invention relates to the technical field of magnetic suspension bearings, in particular to a five-degree-of-freedom integrated hybrid magnetic bearing with a novel structure. Background The magnetic bearing motor is required to realize stable suspension of the rotor, constraint is required to be applied to five degrees of freedom, and the stable suspension is required to be realized by a magnetic suspension bearing. The magnetic suspension bearing belongs to a non-contact bearing, utilizes magnetic field force to suspend a rotor in space in a non-contact manner, and integrates the technologies of mechanics, rotor dynamics, control theory, electromagnetism and the like into a whole. Compared with the common bearing, the magnetic bearing has a series of excellent qualities of no friction, no abrasion, no lubrication and sealing, high speed, high precision, long service life, adjustable bearing rigidity and damping and the like, and is widely paid attention to engineering industry, and is one of the leading-edge problems in the fields of machinery, electrical control and the like. The hybrid magnetic bearing is a magnetic bearing which adopts a permanent magnet to provide bias magnetic flux, controls the winding to be electrified to generate control magnetic flux, and the two magnetic fluxes are mutually overlapped to enhance the air gap field at one side of the rotor of the hybrid magnetic bearing, and weaken the magnetic field in the opposite direction to generate radial force pointing to the enhancing direction of the magnetic field, so that the stable suspension of the rotor is realized. At present, the hybrid magnetic bearing is widely applied to various high-performance transmission systems, and to realize stable suspension of the rotor, two radial hybrid magnetic bearings and one axial hybrid magnetic bearing are required to jointly support the five-degree-of-freedom suspension of the rotor, so that the axial length is too long and the critical rotation speed is low. Therefore, in order to solve the above-mentioned problem, domestic and foreign scholars have researched a plurality of integrated hybrid magnetic bearings for realizing five-degree-of-freedom stable suspension of the rotor in one unit, namely, axial and radial suspension functions are integrated together, and a common permanent magnet generates radial and axial bias magnetic fluxes which pass through axial and radial air gaps at the same time, so that a proportion constraint relation exists between a plurality of radial and axial parameters, and meanwhile, complicated decoupling control strategies are needed to realize the suspension performance of the rotor, so that the cost of a control system is high and the calculated amount is large. Disclosure of Invention The invention provides a five-degree-of-freedom integrated hybrid magnetic bearing with a novel structure, axial magnetic flux and radial magnetic flux are not related, the radial parameter design and the axial parameter design are independent, the axial magnetic circuit is short, the control is simpler, the realization is easy, and the power consumption is low. The invention is realized by the following technical scheme: The novel-structure five-degree-of-freedom integrated hybrid magnetic bearing comprises a stator and a rotor, wherein the stator comprises an axial stator core, two radial stator cores, a left L-shaped iron core, a right L-shaped iron core, a left annular permanent magnet and a right annular permanent magnet, the two radial stator cores are symmetrically arranged inside the axial stator core, the left L-shaped iron core and the right annular permanent magnet are respectively symmetrically arranged outside the axial stator core, symmetrical axial control coils are wound on the inner side of the axial stator core, 3 control magnetic poles and 3 bias magnetic poles are uniformly distributed on the inner circumference of the radial stator core, the radial control coils are wound on the control magnetic poles, permanent magnets are arranged in the bias magnetic poles, the rotor is arranged inside the stator, a rotating shaft, a rotor axial iron core, a magnetism isolating ring and a pair of rotor radial iron cores are arranged inside the stator core from inside to outside, the magnetism isolating ring is embedded between the rotor axial iron core and the pair of rotor radial iron cores, the axial width of the rotor axial iron core is smaller than the axial magnetism isolating ring, the radial width of the rotor axial iron core is equal to the radial direction and is equal to the radial stator cores, radial air gaps exist between the radial stator core and the inner side of the axial stator core and the left L-shaped iron core and the rotor core, and the rotor core are respectively in an upper axial air gap and a lower axial air gap are formed between the axial air gap and