CN113833758A - Multi-ring asymmetric structure permanent magnetic bearing - Google Patents
Multi-ring asymmetric structure permanent magnetic bearing Download PDFInfo
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- CN113833758A CN113833758A CN202111197172.9A CN202111197172A CN113833758A CN 113833758 A CN113833758 A CN 113833758A CN 202111197172 A CN202111197172 A CN 202111197172A CN 113833758 A CN113833758 A CN 113833758A
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- permanent magnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/041—Passive magnetic bearings with permanent magnets on one part attracting the other part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
Abstract
The invention discloses a multi-ring asymmetric structure permanent magnetic bearing, belongs to the field of magnetic suspension bearings, and aims to solve the problems of low suspension force and low bearing capacity of a traditional passive magnetic suspension bearing adopting a symmetric structure. The invention comprises a stator and a rotor, wherein the stator is coaxially arranged outside the rotor; the rotor comprises a permanent magnet ring array and a rotating shaft, and the permanent magnet ring array is arranged on the rotating shaft; the stator comprises two arc-shaped permanent magnet arrays, namely an upper arc-shaped permanent magnet array and a lower arc-shaped permanent magnet array, wherein the upper arc-shaped permanent magnet array and the lower arc-shaped permanent magnet array are identical in structure and are symmetrically arranged above and below the rotor; the permanent magnet ring array and the upper arc-shaped permanent magnet array attract each other, and the permanent magnet ring array and the lower arc-shaped permanent magnet array repel each other to form magnetic suspension force. The invention is used in the field of large-scale heavy-load magnetic suspension.
Description
Technical Field
The invention relates to a technology for improving the suspension force of a passive magnetic suspension bearing, and belongs to the field of magnetic suspension bearings.
Background
The magnetic suspension bearing suspends the rotor in the air by utilizing magnetic force, so that the rotor is not in mechanical contact with the stator, and the magnetic suspension bearing has the remarkable advantages of no abrasion, low noise, long service life and the like, is used in special environments such as high speed, vacuum, ultra-clean and the like, and is currently applied to the fields of high-speed motors, turbines, expanders, compressors and the like.
According to the working principle of the magnetic suspension bearing, the magnetic suspension bearing can be divided into an active type and a passive type. The active magnetic suspension bearing utilizes electromagnetic force to realize suspension and has the characteristics of controllable suspension force, stable system and the like. The passive magnetic suspension bearing realizes suspension by utilizing the interaction force between permanent magnets, has the characteristics of no loss, simple structure and the like, but cannot be self-stabilized.
The traditional passive magnetic suspension bearing generally adopts a symmetrical structure, the stator and the rotor are both permanent magnet rings, axial or radial arrangement is adopted according to actual requirements, if radial arrangement is adopted, the outer diameter of the rotor is smaller than the inner diameter of the stator, and the stator and the rotor are concentrically arranged. Due to the adoption of a symmetrical structure, when the two are concentric, no interaction force is generated, and once the rotor is eccentric, the interaction force is generated. For some large-scale heavy-load application fields, the passive magnetic suspension bearing can not generate a large suspension force at a symmetrical position, so that an active magnetic bearing matched with the passive magnetic suspension bearing needs to generate additional active control force for compensation, thus the loss and the heat are serious, and the application of the passive magnetic bearing in the large-scale heavy-load magnetic suspension field is limited.
Disclosure of Invention
The invention aims to solve the problems of low suspension force and low bearing capacity of the traditional passive magnetic suspension bearing adopting a symmetrical structure, and provides a multi-ring permanent magnetic bearing with an asymmetrical structure.
The invention relates to a multi-ring asymmetric structure permanent magnetic bearing, which comprises a stator and a rotor, wherein the stator is coaxially arranged outside the rotor; the rotor comprises a permanent magnet ring array 3 and a rotating shaft, and the permanent magnet ring array 3 is arranged on the rotating shaft; the stator comprises two arc-shaped permanent magnet arrays, namely an upper arc-shaped permanent magnet array 1 and a lower arc-shaped permanent magnet array 2, and the upper arc-shaped permanent magnet array 1 and the lower arc-shaped permanent magnet array 2 are identical in structure and are symmetrically arranged above and below the rotor;
the permanent magnet ring array 3 and the upper arc-shaped permanent magnet array 1 attract each other, and the permanent magnet ring array 3 and the lower arc-shaped permanent magnet array 2 repel each other to form magnetic levitation force.
Preferably, the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings magnetize along the radial direction, and the magnetizing directions of the M permanent magnet rings are the same;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the radial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are the same;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing direction of the arc permanent magnets in the upper arc permanent magnet array 1 is the same as that of the permanent magnet ring in the rotor, and the magnetizing direction of the arc permanent magnets in the lower arc permanent magnet array 2 is opposite to that of the permanent magnet ring in the rotor.
Preferably, the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings magnetize along the radial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are coaxially arranged at equal intervals in sequence along the axial direction, the arc permanent magnets are magnetized along the radial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array 1 and the permanent magnet ring in the rotor aligned with the axial center of the arc permanent magnet array are the same;
the magnetizing directions of the arc permanent magnets in the lower arc permanent magnet array 2 and the permanent magnet rings in the rotor aligned with the axial center of the arc permanent magnet array are opposite.
Preferably, the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings magnetize along the radial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M radial magnetizing arc-shaped permanent magnets and M-1 axial magnetizing arc-shaped permanent magnets, the M radial magnetizing arc-shaped permanent magnets and the M-1 axial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 axial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and the M radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one; m-1 axial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 axial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center;
the radial magnetizing arc permanent magnet in the upper arc permanent magnet array 1 has the same magnetizing direction as the permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet;
the radial magnetizing arc permanent magnets in the lower arc permanent magnet array 2 are opposite to the magnetizing direction of the permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnets.
Preferably, the permanent magnet ring array 3 of the rotor comprises M radial magnetizing permanent magnet rings and M-1 axial magnetizing permanent magnet rings, the M radial magnetizing permanent magnet rings and the M-1 axial magnetizing permanent magnet rings are axially and alternately arranged to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing permanent magnet rings are sequentially and alternately opposite; the magnetizing directions of the M-1 axial magnetizing permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M radial magnetizing arc-shaped permanent magnets and M-1 axial magnetizing arc-shaped permanent magnets, the M radial magnetizing arc-shaped permanent magnets and the M-1 axial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 axial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M radial magnetizing permanent magnet rings of the rotor, the M radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and the M radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center; m-1 axial magnetizing permanent magnet rings of the rotor, M-1 axial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 axial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in an axial center;
the axial size of the radial magnetizing arc permanent magnet in the arc permanent magnet array is larger than that of the radial magnetizing permanent magnet ring in the rotor; the axial size of the axially magnetized arc permanent magnet in the arc permanent magnet array is smaller than that of the axially magnetized permanent magnet ring in the rotor;
the radial magnetizing arc permanent magnets in the upper arc permanent magnet array 1 and the radial magnetizing permanent magnet rings in the rotor aligned with the axial center of the radial magnetizing arc permanent magnets are in the same magnetizing direction, and the axial magnetizing permanent magnet rings in the upper arc permanent magnet array 1 and the axial magnetizing permanent magnet rings in the rotor aligned with the axial center of the axial magnetizing permanent magnet rings are in opposite magnetizing directions;
the radial magnetizing arc permanent magnets in the lower arc permanent magnet array 2 are opposite to the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnets, and the axial magnetizing permanent magnet ring in the lower arc permanent magnet array 2 is the same as the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing permanent magnet ring.
Preferably, the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings magnetize along the axial direction, and the magnetizing directions of the M permanent magnet rings are the same;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the axial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are the same;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array 1 and the permanent magnet ring in the rotor are opposite;
the magnetizing directions of the arc permanent magnets in the lower arc permanent magnet array 2 and the permanent magnet ring in the rotor are the same.
Preferably, the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings magnetize along the axial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the axial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing directions of the arc permanent magnets in the upper arc permanent magnet array 1 and the permanent magnet rings in the rotor aligned with the axial center of the arc permanent magnet array are opposite;
the magnetizing directions of the arc permanent magnets in the lower arc permanent magnet array 2 and the permanent magnet rings in the rotor aligned with the axial center of the arc permanent magnet array are the same.
Preferably, the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings magnetize along the axial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M axial magnetizing arc-shaped permanent magnets and M-1 radial magnetizing arc-shaped permanent magnets, the M axial magnetizing arc-shaped permanent magnets and the M-1 radial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 radial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M axially magnetized arc-shaped permanent magnets of the upper arc-shaped permanent magnet array 1 and the M axially magnetized arc-shaped permanent magnets of the lower arc-shaped permanent magnet array 2 are respectively aligned with the axial centers one by one; m-1 radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the axial magnetizing arc permanent magnet in the upper arc permanent magnet array 1 is opposite to the magnetizing direction of a permanent magnet ring in the rotor aligned with the axial center of the axial magnetizing arc permanent magnet array;
the axial magnetizing arc permanent magnet in the lower arc permanent magnet array 2 has the same magnetizing direction as the permanent magnet ring in the rotor aligned with the axial center of the permanent magnet ring.
Preferably, the permanent magnet ring array 3 of the rotor comprises M axial magnetizing permanent magnet rings and M-1 radial magnetizing permanent magnet rings, the M axial magnetizing permanent magnet rings and the M-1 radial magnetizing permanent magnet rings are axially and alternately arranged to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing permanent magnet rings are sequentially and alternately opposite; the magnetizing directions of the M-1 axial magnetizing permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M axial magnetizing arc-shaped permanent magnets and M-1 radial magnetizing arc-shaped permanent magnets, the M axial magnetizing arc-shaped permanent magnets and the M-1 radial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 radial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M axial magnetizing permanent magnet rings of the rotor, the M axial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and the M axial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center; m-1 radial magnetizing permanent magnet rings of the rotor, M-1 radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center;
the axial size of the axially magnetized arc permanent magnet in the arc permanent magnet array is larger than that of the axially magnetized permanent magnet ring in the rotor; the axial size of the radial magnetizing arc permanent magnet in the arc permanent magnet array is smaller than that of the radial magnetizing permanent magnet ring in the rotor;
the axial magnetizing arc permanent magnets in the upper arc permanent magnet array 1 and the axial magnetizing permanent magnet rings in the rotor aligned with the axial center of the upper arc permanent magnet array 1 have opposite magnetizing directions, and the radial magnetizing permanent magnet rings in the upper arc permanent magnet array 1 and the radial magnetizing permanent magnet rings in the rotor aligned with the axial center of the upper arc permanent magnet array 1 have the same magnetizing directions;
the axial magnetizing arc permanent magnets in the lower arc permanent magnet array 2 have the same magnetizing direction with the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array, and the radial magnetizing permanent magnet ring in the lower arc permanent magnet array 2 has the opposite magnetizing direction with the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array.
Preferably, the permanent magnet synchronous motor further comprises a stator fixing frame and a rotor sheath, wherein the upper arc-shaped permanent magnet array 1 and the lower arc-shaped permanent magnet array 2 are both arranged in the stator fixing frame, and the stator fixing frame adopts a high-strength non-magnetic-conductive material; a rotor sheath is sleeved outside the permanent magnet ring array 3 and adopts a high-strength non-magnetic material; the permanent magnet ring array 3 is directly sleeved on the rotating shaft or sleeved on the rotating shaft through a non-magnetic shaft sleeve.
The invention has the beneficial effects that: (1) compared with the traditional permanent magnetic bearing with a symmetrical structure, the permanent magnetic bearing can provide larger static bearing capacity and has remarkable advantages in a large-scale heavy-load magnetic suspension system; (2) the bearing provides the suspension power size that supports static load and can design and adjust according to the quantity of permanent magnet array, and when load was great, can increase the quantity of permanent magnet in the permanent magnet array, the design is nimble convenient.
Drawings
FIG. 1 is a schematic structural diagram of a multi-ring asymmetric permanent magnetic bearing according to the present invention;
FIGS. 2(a) to 2(h) are schematic views of 8 embodiments, respectively;
FIG. 3 is a schematic view of a rotor permanent magnet ring array directly fitted on a magnetic rotating shaft;
fig. 4 is a schematic view of a rotor permanent magnet ring array sleeved on a rotating shaft through a non-magnetic shaft sleeve.
Description of reference numerals: 1-upper arc permanent magnet array, 2-lower arc permanent magnet array, 3-permanent magnet ring array, 4-rotor sheath, 5-non-magnetic shaft sleeve.
Detailed Description
The first embodiment is as follows: the following describes the present embodiment with reference to fig. 1, and the multi-ring asymmetric permanent magnetic bearing of the present embodiment includes a stator and a rotor, the stator is coaxially disposed outside the rotor; the rotor comprises a permanent magnet ring array 3 and a rotating shaft, and the permanent magnet ring array 3 is arranged on the rotating shaft; the stator comprises two arc-shaped permanent magnet arrays, namely an upper arc-shaped permanent magnet array 1 and a lower arc-shaped permanent magnet array 2, and the upper arc-shaped permanent magnet array 1 and the lower arc-shaped permanent magnet array 2 are identical in structure and are symmetrically arranged above and below the rotor;
the permanent magnet ring array 3 and the upper arc-shaped permanent magnet array 1 attract each other, and the permanent magnet ring array 3 and the lower arc-shaped permanent magnet array 2 repel each other to form magnetic levitation force.
Compared with the traditional permanent magnetic bearing with a symmetrical structure, the stator of the embodiment is not a whole ring, but is divided into an upper arc array and a lower arc array. In the traditional permanent magnetic bearing, a stator and a rotor both adopt an integral ring structure, when a stator permanent magnetic ring and a rotor permanent magnetic ring are concentric, radial force is zero, and only when the stator and the rotor are dislocated in the radial direction or the axial direction, acting force can be generated. In comparison, the stator is divided into an upper arc array and a lower arc array, the magnetizing directions are opposite, the stator and the rotor permanent magnet ring can interact to generate attraction and repulsion respectively, the two acting forces have the same direction for the rotor, and a larger suspension force can be formed by superposition, so that the gravity compensation and passive support of the permanent magnet bearing on the load at the balance position are realized, and the loss and the heat generation of the whole active and passive bearing system are reduced.
The second embodiment is as follows: the following describes the present embodiment with reference to fig. 2(a), and the present embodiment further describes the first embodiment, in which the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the radial direction, and the magnetizing directions of the M permanent magnet rings are the same;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the radial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are the same;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing direction of the arc permanent magnet in the upper arc permanent magnet array 1 is the same as that of the permanent magnet ring in the rotor, so that the upper arc permanent magnet array 1 on the upper part of the stator is attracted with the rotor, and the magnetizing direction of the arc permanent magnet in the lower arc permanent magnet array 2 is opposite to that of the permanent magnet ring in the rotor, so that the lower arc permanent magnet array 2 on the lower part of the stator is repelled with the rotor.
The axial sizes of the arc permanent magnets of the upper arc permanent magnet array 1 and the lower arc permanent magnet array 2 are the same and are larger than or smaller than the axial size of the permanent magnet ring array 3.
Two examples are given in this embodiment:
in embodiment 1, the arc permanent magnet in the upper arc permanent magnet array 1 of the stator is magnetized from inside to outside along the radial direction, the inner side is an S pole, and the outer side is an N pole. The arc permanent magnets in the lower arc permanent magnet array 2 of the stator are magnetized from outside to inside along the radial direction, the inner side is an N pole, the outer side is an S pole, the permanent magnet rings in the permanent magnet ring array 3 of the rotor are magnetized from inside to outside along the radial direction, the inner side is the S pole, and the outer side is the N pole. The rotor and the upper arc-shaped permanent magnet array 1 with the same magnetizing direction are mutually attracted, and the rotor and the lower arc-shaped permanent magnet array 2 with the opposite magnetizing direction are mutually repelled.
In embodiment 2, the permanent magnets in the upper arc-shaped permanent magnet array 1 of the stator are magnetized from outside to inside along the radial direction, the inside is an N pole, and the outside is an S pole. Permanent magnets in the lower arc-shaped permanent magnet array 2 of the stator are magnetized from inside to outside along the radial direction, the inner side is an S pole, the outer side is an N pole, and the lower arc-shaped permanent magnets are axially aligned with the corresponding upper arc-shaped permanent magnets. The permanent magnet rings in the permanent magnet ring array 3 of the rotor are magnetized from outside to inside along the radial direction, the inner side is an N pole, and the outer side is an S pole.
The third concrete implementation mode: in the following, the present embodiment is described with reference to fig. 2(b), and the present embodiment further describes the first embodiment, in which the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the radial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are coaxially arranged at equal intervals in sequence along the axial direction, the arc permanent magnets are magnetized along the radial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array 1 and the permanent magnet ring in the rotor aligned with the axial center of the upper arc permanent magnet array are the same, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted;
the magnetizing directions of the arc permanent magnet in the lower arc permanent magnet array 2 and the permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array are opposite, so that mutual repulsion between the lower arc permanent magnet array 2 on the lower portion of the stator and the rotor is realized.
The axial sizes of the arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 are the same and are larger than or smaller than the axial size of the permanent magnet ring array 3.
Two examples are given in this embodiment:
in the embodiment 1, the arc permanent magnets in the upper arc permanent magnet array 1 of the stator are magnetized along the radial direction and are alternately opposite, for example, the 1 st, 3 rd and 5 … … th rows are magnetized from inside to outside, the inner side is an S pole, and the outer side is an N pole; columns 2, 4 and 6 … … are magnetized from outside to inside, with the inside being the N-pole and the outside being the S-pole. The arc permanent magnets in the lower arc permanent magnet array 2 of the stator are magnetized along the radial direction and are alternately opposite, the 1 st, 3 rd and 5 th rows 5 … … are magnetized from outside to inside, the inner side is an N pole, and the outer side is an S pole; rows 2, 4 and 6 … … are magnetized from inside to outside, with the inside being the S pole and the outside being the N pole. Permanent magnet rings in the permanent magnet ring array 3 of the rotor are magnetized along the radial direction, are alternately opposite and are consistent with the upper arc permanent magnet array 1, the 1 st, the 3 th and the 5 th 5 … … rows are magnetized from inside to outside, the inner side is an S pole, and the outer side is an N pole; columns 2, 4 and 6 … … are magnetized from outside to inside, with the inside being the N-pole and the outside being the S-pole. The rotor and the upper arc-shaped permanent magnet array 1 with the same magnetizing direction are mutually attracted, and the rotor and the lower arc-shaped permanent magnet array 2 with the opposite magnetizing direction are mutually repelled.
In embodiment 2, the arc permanent magnets in the upper arc permanent magnet array 1 of the stator are magnetized along the radial direction and are alternately opposite, for example, the rows 1, 3 and 5 … … are magnetized from outside to inside, the inner side is an N pole, and the outer side is an S pole; rows 2, 4 and 6 … … are magnetized from inside to outside, with the inside being the S pole and the outside being the N pole. The arc permanent magnets in the lower arc permanent magnet array 2 of the stator are magnetized along the radial direction and are alternately opposite, the No. 1, No. 3 and No. 5 … … rows are magnetized from inside to outside, the inner side is an S pole, and the outer side is an N pole; columns 2, 4 and 6 … … are magnetized from outside to inside, with the inside being the N-pole and the outside being the S-pole. Permanent magnet rings in the permanent magnet ring array 3 of the rotor are magnetized along the radial direction, are alternately opposite and are consistent with the upper arc permanent magnet array 1, the 1 st, 3 th and 5 th rows are magnetized from outside to inside, the inner side is an N pole, and the outer side is an S pole; rows 2, 4 and 6 … … are magnetized from inside to outside, with the inside being the S pole and the outside being the N pole.
The fourth concrete implementation mode: in the following, the present embodiment is described with reference to fig. 2(c), and the present embodiment further describes the first embodiment, in which the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the radial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M radial magnetizing arc-shaped permanent magnets and M-1 axial magnetizing arc-shaped permanent magnets, the M radial magnetizing arc-shaped permanent magnets and the M-1 axial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 axial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and the M radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one; m-1 axial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 axial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center;
the radial magnetizing arc permanent magnet in the upper arc permanent magnet array 1 and the permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet are in the same magnetizing direction, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted;
the radial magnetizing arc permanent magnet in the lower arc permanent magnet array 2 is opposite to the magnetizing direction of the permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet, so that mutual repulsion between the lower arc permanent magnet array 2 on the lower part of the stator and the rotor is realized.
In the embodiment, the magnetizing direction of the upper arc-shaped permanent magnet array 1 is the same as that of the rotor, the upper arc-shaped permanent magnet array and the rotor attract each other, and the magnetizing direction of the lower arc-shaped permanent magnet array 2 is opposite to that of the rotor, and the upper arc-shaped permanent magnet array and the rotor repel each other.
The radial magnetizing arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 have the same axial size, and are larger than or smaller than the axial size of the permanent magnet ring array 3. The axial magnetizing arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 are the same as the permanent magnet rings of the permanent magnet ring array 3 in axial size.
The fifth concrete implementation mode: the following describes the present embodiment with reference to fig. 2(d), and the present embodiment further describes the first embodiment, where the permanent magnet ring array 3 of the rotor includes M radial magnetizing permanent magnet rings and M-1 axial magnetizing permanent magnet rings, the M radial magnetizing permanent magnet rings and the M-1 axial magnetizing permanent magnet rings are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing permanent magnet rings are sequentially and alternately opposite; the magnetizing directions of the M-1 axial magnetizing permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M radial magnetizing arc-shaped permanent magnets and M-1 axial magnetizing arc-shaped permanent magnets, the M radial magnetizing arc-shaped permanent magnets and the M-1 axial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 axial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M radial magnetizing permanent magnet rings of the rotor, the M radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and the M radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center; m-1 axial magnetizing permanent magnet rings of the rotor, M-1 axial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 axial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in an axial center;
the axial size of the radial magnetizing arc permanent magnet in the arc permanent magnet array is larger than that of the radial magnetizing permanent magnet ring in the rotor; the axial size of the axially magnetized arc permanent magnet in the arc permanent magnet array is smaller than that of the axially magnetized permanent magnet ring in the rotor;
the radial magnetizing arc permanent magnet in the upper arc permanent magnet array 1 and the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet array are in the same magnetizing direction, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted; the magnetizing directions of the axial magnetizing permanent magnet ring in the upper arc-shaped permanent magnet array 1 and the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the upper arc-shaped permanent magnet array are opposite; the mutual attraction force between the upper arc-shaped permanent magnet array 1 on the upper part of the stator and the rotor is further strengthened.
The magnetizing directions of the radial magnetizing arc permanent magnet in the lower arc permanent magnet array 2 and the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet array are opposite, so that mutual repulsion between the lower arc permanent magnet array 2 at the lower part of the stator and the rotor is realized, the magnetizing directions of the axial magnetizing permanent magnet ring in the lower arc permanent magnet array 2 and the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the axial magnetizing permanent magnet ring are the same, and the mutual repulsion between the lower arc permanent magnet array 2 at the lower part of the stator and the rotor is further strengthened.
The axial size of the radial magnetizing arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 is the same as the axial size of the axial magnetizing permanent magnet ring of the permanent magnet ring array 3, and the radial magnetizing arc permanent magnets and the axial magnetizing permanent magnet ring are of a first size;
the axial size of the axial magnetizing arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 is the same as the axial size of the radial magnetizing permanent magnet ring of the permanent magnet ring array 3, and the axial size is the second size;
the first and second dimensions are arranged one over the other, i.e. the first dimension is larger than the second dimension, or the first dimension is smaller than the second dimension.
The sixth specific implementation mode: in the following, the present embodiment is described with reference to fig. 2(e), and the present embodiment further describes the first embodiment, in which the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the axial direction, and the magnetizing directions of the M permanent magnet rings are the same;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the axial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are the same;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array 1 and the permanent magnet ring in the rotor are opposite, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted.
The magnetizing directions of the arc permanent magnet in the lower arc permanent magnet array 2 and the permanent magnet ring in the rotor are the same, so that mutual repulsion between the lower arc permanent magnet array 2 on the lower portion of the stator and the rotor is realized.
The axial sizes of the arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 are the same and are larger than or smaller than the axial size of the permanent magnet ring array 3.
The seventh embodiment: in the following, the present embodiment is described with reference to fig. 2(f), and the present embodiment further describes the first embodiment, in which the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the axial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the axial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M arc permanent magnets of the upper arc permanent magnet array 1 and the M arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array 1 and the permanent magnet ring in the rotor aligned with the axial center of the upper arc permanent magnet array are opposite, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted;
the magnetizing directions of the arc permanent magnet in the lower arc permanent magnet array 2 and the permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array are the same, so that mutual repulsion between the lower arc permanent magnet array 2 on the lower portion of the stator and the rotor is realized.
The axial sizes of the arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 are the same and are larger than or smaller than the axial size of the permanent magnet ring array 3.
The specific implementation mode is eight: in the following, the present embodiment is described with reference to fig. 2(g), and the present embodiment further describes the first embodiment, in which the permanent magnet ring array 3 of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the axial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M axial magnetizing arc-shaped permanent magnets and M-1 radial magnetizing arc-shaped permanent magnets, the M axial magnetizing arc-shaped permanent magnets and the M-1 radial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 radial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M axially magnetized arc-shaped permanent magnets of the upper arc-shaped permanent magnet array 1 and the M axially magnetized arc-shaped permanent magnets of the lower arc-shaped permanent magnet array 2 are respectively aligned with the axial centers one by one; m-1 radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with the axial center one by one;
the axial magnetizing direction of the arc permanent magnet in the upper arc permanent magnet array 1 is opposite to the magnetizing direction of the permanent magnet ring in the rotor aligned with the axial center of the upper arc permanent magnet array 1, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted;
the axial magnetizing arc permanent magnet in the lower arc permanent magnet array 2 has the same magnetizing direction with the permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array, so that mutual repulsion between the lower arc permanent magnet array 2 at the lower part of the stator and the rotor is realized.
The axial dimension of the axial magnetizing arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 is the same and is larger or smaller than that of the permanent magnet ring array 3. The radial magnetizing arc permanent magnets of the arc permanent magnet array 1 and the lower arc permanent magnet array 2 are the same as the permanent magnet rings of the permanent magnet ring array 3 in axial size.
The specific implementation method nine: the following describes the present embodiment with reference to fig. 2(h), and the present embodiment further describes the first embodiment, where the permanent magnet ring array 3 of the rotor includes M axial magnetizing permanent magnet rings and M-1 radial magnetizing permanent magnet rings, the M axial magnetizing permanent magnet rings and the M-1 radial magnetizing permanent magnet rings are axially and alternately arranged to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing permanent magnet rings are sequentially and alternately opposite; the magnetizing directions of the M-1 axial magnetizing permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M axial magnetizing arc-shaped permanent magnets and M-1 radial magnetizing arc-shaped permanent magnets, the M axial magnetizing arc-shaped permanent magnets and the M-1 radial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 radial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M axial magnetizing permanent magnet rings of the rotor, the M axial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and the M axial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center; m-1 radial magnetizing permanent magnet rings of the rotor, M-1 radial magnetizing arc permanent magnets of the upper arc permanent magnet array 1 and M-1 radial magnetizing arc permanent magnets of the lower arc permanent magnet array 2 are respectively aligned with one another in the axial center;
the axial size of the axially magnetized arc permanent magnet in the arc permanent magnet array is larger than that of the axially magnetized permanent magnet ring in the rotor; the axial size of the radial magnetizing arc permanent magnet in the arc permanent magnet array is smaller than that of the radial magnetizing permanent magnet ring in the rotor;
the axial magnetizing arc permanent magnet in the upper arc permanent magnet array 1 and the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the upper arc permanent magnet array are opposite in magnetizing direction, and the radial magnetizing permanent magnet ring in the upper arc permanent magnet array 1 and the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the upper arc permanent magnet array are the same in magnetizing direction, so that the upper arc permanent magnet array 1 on the upper part of the stator and the rotor are mutually attracted;
the axial magnetizing arc permanent magnet in the lower arc permanent magnet array 2 has the same magnetizing direction with the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array, and the radial magnetizing permanent magnet ring in the lower arc permanent magnet array 2 has the opposite magnetizing direction with the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array 2, so that mutual repulsion between the lower arc permanent magnet array 2 at the lower part of the stator and the rotor is realized.
In the second to ninth embodiments, the length of the permanent magnet of the stator is different from the axial length of the permanent magnet of the rotor, and the permanent magnet of the stator and the permanent magnet of the rotor are arranged in a long-short manner, so that when the permanent magnet of the stator and the permanent magnet of the rotor are dislocated, the coupling area of the permanent magnet of the stator and the permanent magnet of the rotor is not greatly changed, the upward attraction force of the upper arc-shaped permanent magnet array 1 and the upward repulsion force of the lower arc-shaped permanent magnet array 2 of the rotor are not greatly changed, and the influence of the axial force on the suspension effect of the magnetic suspension bearing is reduced.
The detailed implementation mode is ten: the first to ninth embodiments are further explained in the present embodiment, further including a stator fixing frame and a rotor sheath, where the upper arc permanent magnet array 1 and the lower arc permanent magnet array 2 are both installed inside one stator fixing frame, and the stator fixing frame adopts a high-strength non-magnetic-conductive material.
The concrete implementation mode eleven: in the following, the present embodiment is described with reference to fig. 3, and the present embodiment further describes the first to tenth embodiments, a rotor sheath 4 is sleeved outside the permanent magnet ring array 3, and the rotor sheath 4 is made of a high-strength non-magnetic material. The permanent magnet ring array 3 is directly sleeved on the rotating shaft.
The specific implementation mode twelve: in the following, the present embodiment is described with reference to fig. 4, and the present embodiment further describes the first to tenth embodiments, a rotor sheath 4 is sleeved outside the permanent magnet ring array 3, and the rotor sheath 4 is made of a high-strength non-magnetic material. The permanent magnet ring array 3 is sleeved on the rotating shaft through a non-magnetic shaft sleeve 5.
The specific implementation mode is thirteen: the bearing system of the embodiment comprises an active control magnetic bearing, a mechanical bearing and a passive magnetic bearing, wherein the passive magnetic bearing is realized by adopting the multi-ring asymmetric structure permanent magnetic bearing of any one of the first to the twelfth embodiments, the asymmetric structure permanent magnetic bearing realizes passive support to load, and the loss of the active control system or the abrasion of the mechanical bearing is reduced.
Claims (10)
1. The permanent magnetic bearing with the multi-ring asymmetric structure is characterized by comprising a stator and a rotor, wherein the stator is coaxially arranged outside the rotor; the rotor comprises a permanent magnet ring array (3) and a rotating shaft, and the permanent magnet ring array (3) is arranged on the rotating shaft; the stator comprises two arc-shaped permanent magnet arrays, namely an upper arc-shaped permanent magnet array (1) and a lower arc-shaped permanent magnet array (2), wherein the upper arc-shaped permanent magnet array (1) and the lower arc-shaped permanent magnet array (2) are identical in structure and are symmetrically arranged above and below the rotor;
the permanent magnet ring array (3) and the upper arc-shaped permanent magnet array (1) are mutually attracted, and the permanent magnet ring array (3) and the lower arc-shaped permanent magnet array (2) are mutually repelled to form magnetic levitation force.
2. The multi-ring asymmetric permanent magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the radial direction, and the magnetizing directions of the M permanent magnet rings are the same;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the radial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are the same;
the M permanent magnet rings of the rotor are respectively aligned with the M arc permanent magnets of the upper arc permanent magnet array (1) and the M arc permanent magnets of the lower arc permanent magnet array (2) in axial center one by one;
the magnetizing direction of the arc permanent magnets in the upper arc permanent magnet array (1) is the same as that of the permanent magnet ring in the rotor, and the magnetizing direction of the arc permanent magnets in the lower arc permanent magnet array (2) is opposite to that of the permanent magnet ring in the rotor.
3. The multi-ring asymmetric permanent magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the radial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are coaxially arranged at equal intervals in sequence along the axial direction, the arc permanent magnets are magnetized along the radial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor are respectively aligned with the M arc permanent magnets of the upper arc permanent magnet array (1) and the M arc permanent magnets of the lower arc permanent magnet array (2) in axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array (1) and the permanent magnet ring in the rotor aligned with the axial center of the arc permanent magnet array are the same;
the magnetizing directions of the arc permanent magnets in the lower arc permanent magnet array (2) and the permanent magnet ring in the rotor aligned with the axial center of the arc permanent magnet array are opposite.
4. The multi-ring asymmetric permanent magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the radial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M radial magnetizing arc-shaped permanent magnets and M-1 axial magnetizing arc-shaped permanent magnets, the M radial magnetizing arc-shaped permanent magnets and the M-1 axial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 axial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor, the M radial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and the M radial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) are respectively aligned with each other in axial center; m-1 axial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and M-1 axial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) are respectively aligned with one another in the axial center;
the radial magnetizing arc permanent magnet in the upper arc permanent magnet array (1) has the same magnetizing direction as the permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet;
the radial magnetizing arc permanent magnets in the lower arc permanent magnet array (2) are opposite to the magnetizing direction of the permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnets.
5. The multi-ring asymmetric permanent magnet magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor comprises M radial magnetizing permanent magnet rings and M-1 axial magnetizing permanent magnet rings, the M radial magnetizing permanent magnet rings and the M-1 axial magnetizing permanent magnet rings are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing permanent magnet rings are sequentially and alternately opposite; the magnetizing directions of the M-1 axial magnetizing permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M radial magnetizing arc-shaped permanent magnets and M-1 axial magnetizing arc-shaped permanent magnets, the M radial magnetizing arc-shaped permanent magnets and the M-1 axial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M radial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 axial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
m radial magnetizing permanent magnet rings of the rotor, M radial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and M radial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) are respectively aligned with each other in axial center; m-1 axial magnetizing permanent magnet rings of the rotor are respectively aligned with M-1 axial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and M-1 axial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) in axial centers one by one;
the axial size of the radial magnetizing arc permanent magnet in the arc permanent magnet array is larger than that of the radial magnetizing permanent magnet ring in the rotor; the axial size of the axially magnetized arc permanent magnet in the arc permanent magnet array is smaller than that of the axially magnetized permanent magnet ring in the rotor;
the radial magnetizing arc permanent magnet in the upper arc permanent magnet array (1) and the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet array are in the same magnetizing direction, and the axial magnetizing permanent magnet ring in the upper arc permanent magnet array (1) and the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the axial magnetizing arc permanent magnet array are in opposite magnetizing directions;
the radial magnetizing arc permanent magnet in the lower arc permanent magnet array (2) is opposite to the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet in the lower arc permanent magnet array, and the axial magnetizing permanent magnet ring in the lower arc permanent magnet array (2) is the same as the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing arc permanent magnet in the lower arc permanent magnet array.
6. The multi-ring asymmetric permanent magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor is formed by arranging M permanent magnet rings in order of equal distance along the axial direction, the permanent magnet rings are magnetized along the axial direction, and the magnetizing directions of the M permanent magnet rings are the same;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the axial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are the same;
the M permanent magnet rings of the rotor are respectively aligned with the M arc permanent magnets of the upper arc permanent magnet array (1) and the M arc permanent magnets of the lower arc permanent magnet array (2) in axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array (1) and the permanent magnet ring in the rotor are opposite;
the magnetizing directions of the arc permanent magnets in the lower arc permanent magnet array (2) and the permanent magnet ring in the rotor are the same.
7. The multi-ring asymmetric permanent magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the axial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc permanent magnet array of the stator is composed of M arc permanent magnets, the M arc permanent magnets are sequentially and coaxially arranged at equal intervals along the axial direction, the arc permanent magnets are magnetized along the axial direction, and the magnetizing directions of the M arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
the M permanent magnet rings of the rotor are respectively aligned with the M arc permanent magnets of the upper arc permanent magnet array (1) and the M arc permanent magnets of the lower arc permanent magnet array (2) in axial center one by one;
the magnetizing directions of the arc permanent magnet in the upper arc permanent magnet array (1) and the permanent magnet ring in the rotor aligned with the axial center of the arc permanent magnet array are opposite;
the magnetizing directions of the arc permanent magnets in the lower arc permanent magnet array (2) and the permanent magnet rings in the rotor aligned with the axial center of the arc permanent magnet array are the same.
8. The multi-ring asymmetric permanent magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor is formed by sequentially arranging M permanent magnet rings at equal intervals along the axial direction, the permanent magnet rings are magnetized along the axial direction, and the magnetizing directions of the M permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M axial magnetizing arc-shaped permanent magnets and M-1 radial magnetizing arc-shaped permanent magnets, the M axial magnetizing arc-shaped permanent magnets and the M-1 radial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 radial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
m permanent magnet rings of the rotor, M axially magnetized arc permanent magnets of the upper arc permanent magnet array (1) and M axially magnetized arc permanent magnets of the lower arc permanent magnet array (2) are respectively aligned with each other in axial center; m-1 radial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and M-1 radial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) are respectively aligned with the axial center one by one;
the axial magnetizing arc permanent magnet in the upper arc permanent magnet array (1) is opposite to the magnetizing direction of a permanent magnet ring in the rotor aligned with the axial center of the upper arc permanent magnet array;
the axial magnetizing arc permanent magnet in the lower arc permanent magnet array (2) has the same magnetizing direction as the permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array.
9. The multi-ring asymmetric permanent magnet magnetic bearing according to claim 1, wherein the permanent magnet ring array (3) of the rotor comprises M axial magnetizing permanent magnet rings and M-1 radial magnetizing permanent magnet rings, the M axial magnetizing permanent magnet rings and the M-1 radial magnetizing permanent magnet rings are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing permanent magnet rings are sequentially and alternately opposite; the magnetizing directions of the M-1 axial magnetizing permanent magnet rings are sequentially and alternately opposite;
each arc-shaped permanent magnet array of the stator comprises M axial magnetizing arc-shaped permanent magnets and M-1 radial magnetizing arc-shaped permanent magnets, the M axial magnetizing arc-shaped permanent magnets and the M-1 radial magnetizing arc-shaped permanent magnets are alternately arranged along the axial direction to form a Halbach permanent magnet array structure, and the magnetizing directions of the M axial magnetizing arc-shaped permanent magnets in the same arc-shaped permanent magnet array are sequentially and alternately opposite; the magnetizing directions of M-1 radial magnetizing arc permanent magnets in the same arc permanent magnet array are sequentially and alternately opposite;
m axial magnetizing permanent magnet rings of the rotor, M axial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and M axial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) are respectively aligned with one another in the axial center; m-1 radial magnetizing permanent magnet rings of the rotor are respectively aligned with M-1 radial magnetizing arc permanent magnets of the upper arc permanent magnet array (1) and M-1 radial magnetizing arc permanent magnets of the lower arc permanent magnet array (2) in axial centers one by one;
the axial size of the axially magnetized arc permanent magnet in the arc permanent magnet array is larger than that of the axially magnetized permanent magnet ring in the rotor; the axial size of the radial magnetizing arc permanent magnet in the arc permanent magnet array is smaller than that of the radial magnetizing permanent magnet ring in the rotor;
the magnetizing directions of the axial magnetizing arc permanent magnet in the upper arc permanent magnet array (1) and the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the axial magnetizing arc permanent magnet array are opposite, and the magnetizing directions of the radial magnetizing permanent magnet ring in the upper arc permanent magnet array (1) and the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the radial magnetizing permanent magnet ring are the same;
the axial magnetizing arc permanent magnet in the lower arc permanent magnet array (2) has the same magnetizing direction with the axial magnetizing permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array, and the radial magnetizing permanent magnet ring in the lower arc permanent magnet array (2) has the opposite magnetizing direction with the radial magnetizing permanent magnet ring in the rotor aligned with the axial center of the lower arc permanent magnet array.
10. The multi-ring asymmetric permanent magnetic bearing according to any one of claims 1 to 9, further comprising a stator fixing frame and a rotor sheath, wherein the upper arc permanent magnetic array (1) and the lower arc permanent magnetic array (2) are both installed inside one stator fixing frame, and the stator fixing frame is made of a high-strength non-magnetic-conductive material; a rotor sheath is sleeved outside the permanent magnet ring array (3), and the rotor sheath is made of a high-strength non-magnetic material; the permanent magnet ring array (3) is directly sleeved on the rotating shaft or sleeved on the rotating shaft through a non-magnetic shaft sleeve.
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| CN109281938A (en) * | 2018-12-02 | 2019-01-29 | 迈格钠磁动力股份有限公司 | A kind of permanent-magnet suspension bearing that magnet safeguard structure is set |
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