CN115853901A - Magnetic suspension bearing system and magnetic suspension motor - Google Patents
Magnetic suspension bearing system and magnetic suspension motor Download PDFInfo
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- CN115853901A CN115853901A CN202310092178.2A CN202310092178A CN115853901A CN 115853901 A CN115853901 A CN 115853901A CN 202310092178 A CN202310092178 A CN 202310092178A CN 115853901 A CN115853901 A CN 115853901A
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- 239000000725 suspension Substances 0.000 title claims abstract description 48
- 230000000712 assembly Effects 0.000 claims abstract description 20
- 238000000429 assembly Methods 0.000 claims abstract description 20
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 230000013011 mating Effects 0.000 claims abstract description 6
- 238000005339 levitation Methods 0.000 claims description 11
- 230000005389 magnetism Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The disclosure relates to a magnetic suspension bearing system and a magnetic suspension motor, and belongs to the technical field of magnetic suspension. The magnetic suspension bearing system comprises a rotor and two magnetic bearing stator assemblies respectively arranged on the left side and the right side of the rotor; each magnetic bearing stator component comprises a stator core and a plurality of magnetic poles arranged on the stator core, and the plurality of magnetic poles are respectively wound with an excitation coil; inclined parts are respectively arranged at the positions of the rotor corresponding to the two magnetic bearing stator components, one ends of the magnetic poles close to the inclined parts are respectively provided with a matching part, and an air gap is formed between the inclined parts and the matching parts; the plurality of magnetic poles are for applying an electromagnetic force to the rotor via the mating portion when the exciting coil is energized, and the inclined portion is for decomposing the electromagnetic force into a first electromagnetic force in an axial direction of the rotor and a second electromagnetic force in a radial direction of the rotor. The magnetic suspension bearing system disclosed by the invention can still realize five-degree-of-freedom magnetic suspension support under the condition of canceling the axial magnetic bearing, effectively shortens the length of a rotor and reduces the production cost.
Description
Technical Field
The disclosure relates to the technical field of magnetic suspension, in particular to a magnetic suspension bearing system and a magnetic suspension motor.
Background
In the related art, a magnetic levitation motor realizes magnetic levitation support of a rotor through two radial magnetic bearings and one axial magnetic bearing. Two radial magnetic bearings are positioned at two ends of the rotor to realize radial positioning of the rotor, and one axial magnetic bearing is positioned at any end of the rotor to realize axial positioning of the rotor. However, the length of the rotor is long due to the arrangement of two radial magnetic bearings and one axial magnetic bearing, the volume of the magnetic suspension motor is large, and the production cost is high.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a magnetic suspension bearing system and a magnetic suspension motor.
The first aspect of the present disclosure provides a magnetic suspension bearing system, including a rotor and two magnetic bearing stator assemblies respectively disposed at left and right sides of the rotor, the two magnetic bearing stator assemblies being symmetrically disposed about the left and right sides of the rotor;
each magnetic bearing stator component comprises a stator core and a plurality of magnetic poles arranged on the stator core, and excitation coils are respectively wound on the magnetic poles;
inclined parts are respectively arranged at the positions of the rotor corresponding to the two magnetic bearing stator components, one ends of the magnetic poles close to the inclined parts are respectively provided with a matching part, the inclined parts are arranged corresponding to the matching parts, and an air gap is formed between the inclined parts and the matching parts;
the plurality of magnetic poles are configured to apply an electromagnetic force to the rotor through the engaging portion when the exciting coil is energized, and the inclined portion is configured to decompose the electromagnetic force into a first electromagnetic force in the rotor axial direction and a second electromagnetic force in the rotor radial direction.
In some embodiments of the present disclosure, the rotor is disposed in an inner ring of the stator core, the plurality of magnetic poles are disposed on the inner ring of the stator core,
the inclined portion comprises a first outer conical surface, the matching portion comprises a first inner conical surface, and the first outer conical surface is parallel to the first inner conical surface.
In some embodiments of the present disclosure, the rotor includes a rotor body, and the first outer tapered surface is disposed to be inclined from an outer wall surface of the rotor body toward a center line direction close to an axial direction of the rotor body.
In some embodiments of the present disclosure, the rotor is disposed outside the outer ring of the stator core, and the plurality of magnetic poles are disposed on the outer ring of the stator core;
the inclined portion comprises a second inner conical surface, the matching portion comprises a second outer conical surface, and the second inner conical surface is parallel to the second outer conical surface.
In some embodiments of the present disclosure, the rotor includes a rotor body, and the second inner tapered surface is disposed to be inclined from an inner wall surface of the rotor body toward a direction away from a center line of an axial direction of the rotor body.
In some embodiments of the present disclosure, two of the ramps corresponding to two of the magnetic bearing stator assemblies are symmetrically disposed about the rotor.
In some embodiments of the present disclosure, the excitation coil includes a first coil and a second coil, the first coil and the second coil being independent of each other; circulating a first current in the first coil, wherein the first current is used for adjusting the radial degree of freedom of the rotor;
and a second current circulates in the second coil, and the second current is used for adjusting the axial degree of freedom of the rotor.
In some embodiments of the present disclosure, the currents circulating within the field coil include a first current for operating point currents of the rotor, a second current for adjusting a radial degree of freedom of the rotor, and a third current for adjusting an axial degree of freedom of the rotor.
In some embodiments of the present disclosure, the plurality of magnetic poles includes first magnetic poles and second magnetic poles, the first magnetic poles and the second magnetic poles being alternately arranged; every two adjacent first magnetic poles and second magnetic poles form a magnetic pole pair, the magnetism of the first magnetic pole and the second magnetic pole belonging to the same magnetic pole pair is opposite, and the magnetism of the two adjacent first magnetic poles and the second magnetic poles belonging to different magnetic pole pairs is the same;
in the same magnetic bearing stator assembly, two magnetic pole pairs which are oppositely arranged are controlled in a differential mode;
in different magnetic bearing stator assemblies, the two magnetic pole pairs symmetrically arranged on the left side and the right side of the rotor are controlled in a differential mode.
A second aspect of the present disclosure proposes a magnetic levitation motor, which includes the magnetic levitation bearing system proposed by the first aspect of the present disclosure.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the magnetic suspension bearing system can still realize five-degree-of-freedom magnetic suspension support under the condition of canceling the axial magnetic bearing, effectively shortens the length of the rotor, reduces the internal space of the magnetic suspension motor occupied by the rotor, reduces the volume of the magnetic suspension motor and reduces the production cost. Meanwhile, after the length of the rotor is shortened, the rigidity of the rotor can be greatly improved, the modal frequency can be improved, and the maximum rotating speed of the magnetic suspension motor can be improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic view of a magnetic bearing system of the related art.
FIG. 2 is a schematic view of the assembly of a rotor and radial magnetic bearing stator assembly of a related art magnetic bearing system.
FIG. 3 is a schematic view of a magnetic bearing system shown in accordance with an exemplary embodiment of the present disclosure.
Fig. 4 is a schematic view of an assembly of a rotor and magnetic bearing stator assembly shown in accordance with an exemplary embodiment of the present disclosure.
Fig. 5 is a schematic view of a stator core and magnetic poles shown in accordance with an exemplary embodiment of the present disclosure.
FIG. 6 is a schematic view of a magnetic bearing system shown in accordance with another exemplary embodiment of the present disclosure.
Fig. 7 is an assembly schematic of a rotor and magnetic bearing stator assembly shown in accordance with another exemplary embodiment of the present disclosure.
Fig. 8 is a schematic view of a stator core and magnetic poles shown in accordance with another exemplary embodiment of the present disclosure.
FIG. 9 is an exploded view of a magnetic bearing stator assembly shown according to an exemplary embodiment illustrating magnetic field forces of a rotor.
Wherein: 1-a rotor; 2' -radial magnetic bearing; 2-a magnetic bearing stator assembly; 3-axial magnetic bearing; 21-a stator core; 22-magnetic pole; 23-a field coil; 4-an air gap; 5-a thrust disc; 11-a rotor body; 12-an inclined portion; 121-a first external conical surface; 122-a second inner conical surface; 221-a mating portion; 201-a first inner conical surface; 202-a second outer conical surface; 24-pole pair; 241-a first magnetic pole; 242-a second magnetic pole; 25-centre line.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
In the related art, as shown in fig. 1, a magnetic bearing system of a magnetic levitation motor includes two radial magnetic bearings 2 'and one axial magnetic bearing 3, the two radial magnetic bearings 2' are located at both ends of a rotor 1, and the axial magnetic bearing 3 is located at either end of the rotor. The axial magnetic bearing 3 comprises two axial magnetic bearing stator components, a thrust disc 5 is arranged between the two axial magnetic bearing stator components, the thrust disc 5 is connected with the rotor 1, and air gaps are respectively formed between the thrust disc 5 and the two axial magnetic bearing stator components, so that the thrust disc 5 rotates in a non-contact manner relative to the two axial magnetic bearing stator components. As shown in fig. 2, each of the radial magnetic bearings 2' includes a radial magnetic bearing stator assembly including a stator core 21, magnetic poles 22, and an exciting coil 23 wound around the magnetic poles 22. An air gap 4 is formed between the magnetic poles 22 and the rotor 1 to allow contactless rotation of the rotor 1 relative to the radial magnetic bearing stator assembly. The outer wall surface of the rotor 1 is an outer cylindrical surface, one side of the magnetic pole 22 close to the rotor 1 is inwards recessed to form an inner cylindrical surface matched with the rotor 1, so that the electromagnetic force applied to the rotor 1 by the magnetic pole 22 is always vertical to the axis of the rotor 1, the two radial magnetic bearings 2' can only maintain the radial balance of the rotor 1, and the axial balance of the rotor 1 is realized by the axial magnetic bearing 3. Two radial magnetic bearings 2 'control four radial degrees of freedom of the rotor 1, and one axial magnetic bearing 3 controls one axial degree of freedom of the rotor 1, so that the conventional magnetic suspension bearing system realizes five-degree-of-freedom magnetic suspension support of the rotor 1 through the two radial magnetic bearings 2' and the one axial magnetic bearing 3. However, the arrangement of two radial magnetic bearings 2' and one axial magnetic bearing 3 results in a longer length of the rotor 1, a larger volume of the magnetic levitation motor, and higher production cost.
In order to solve the technical problem, the present disclosure provides a magnetic suspension bearing system, which includes a rotor and two magnetic bearing stator assemblies respectively disposed at left and right sides of the rotor; each magnetic bearing stator component comprises a stator core and a plurality of magnetic poles arranged on the stator core, and the plurality of magnetic poles are respectively wound with an excitation coil; inclined parts are respectively arranged at the positions of the rotor corresponding to the two magnetic bearing stator components, one ends of the magnetic poles close to the inclined parts are respectively provided with a matching part, the inclined parts are arranged corresponding to the matching parts, and an air gap is formed between the inclined parts and the matching parts; the plurality of magnetic poles are for applying an electromagnetic force to the rotor via the mating portion when the exciting coil is energized, and the inclined portion is for decomposing the electromagnetic force into a first electromagnetic force in an axial direction of the rotor and a second electromagnetic force in a radial direction of the rotor. The magnetic suspension bearing system can still realize five-degree-of-freedom magnetic suspension support under the condition of canceling the axial magnetic bearing, effectively shortens the length of the rotor, reduces the internal space of the magnetic suspension motor occupied by the rotor, reduces the volume of the magnetic suspension motor and reduces the production cost. Meanwhile, after the length of the rotor is shortened, the rigidity of the rotor can be greatly improved, the modal frequency can be improved, and the maximum rotating speed of the magnetic suspension motor can be improved.
The technical solutions of the present disclosure are explained in detail below with reference to the drawings, and the following embodiments and implementations may be combined with each other without conflict.
According to an exemplary embodiment of the present disclosure, as shown in fig. 3 to 8, the present embodiment proposes a magnetic suspension bearing system, which includes a rotor 1 and two magnetic bearing stator assemblies 2 respectively disposed at left and right sides of the rotor 1 to maintain radial balance at two ends of the rotor 1. The left and right sides of the rotor 1 defined in the present embodiment refer to the left and right sides of the rotor 1 in the directions shown in fig. 3 and 6. Each magnetic bearing stator assembly 2 comprises a stator core 21 and a plurality of magnetic poles 22 arranged on the stator core 21, and excitation coils 23 are respectively wound on the plurality of magnetic poles 22. The integrated structure of the stator core 21 and the magnetic poles 22 of the present embodiment may be formed by stacking a plurality of stator laminations, which are insulated from each other, so that the eddy current loss of the stator core 21 is reduced. The stator core 21 is annular, and the positional relationship between the rotor 1 and the stator core 21 is not limited, and as shown in fig. 3 to 5, the rotor 1 may be disposed in an inner ring of the stator core 21, and the corresponding plurality of magnetic poles 22 may be disposed on the inner ring of the stator core 21. As shown in fig. 6 to 8, the rotor 1 may be further disposed outside the outer ring of the stator core 21, and the corresponding plurality of magnetic poles 22 are disposed on the outer ring of the stator core 21. The position relationship between the stator core 21 and the rotor 1 can be determined flexibly according to the application scene, performance requirements, production cost and other aspects of the magnetic suspension bearing system. The number of the magnetic poles 22 disposed on the stator core 21 is not limited in this embodiment, the magnetic poles 22 on the stator core 21 generally appear in pairs, the number of the magnetic poles 22 should be not less than four, and the number of the magnetic poles 22 can be determined by comprehensively considering the performance and the production cost of the required magnetic bearing stator assembly. Each magnetic pole 22 is wound with an excitation coil 23, and when the excitation coil 23 is energized, the corresponding magnetic pole 22 generates magnetism, and the magnetic pole 22 generates magnetism and then applies magnetic force to the rotor 1.
As shown in fig. 3 to 8, in the rotor 1 of the present embodiment, the inclined portions 12 are provided at positions corresponding to the two magnetic bearing stator assemblies 2, respectively, and the two inclined portions 12 corresponding to the two magnetic bearing stator assemblies 2 are opposite in inclination direction to each other at the left and right sides of the rotor 1. The two ramps 12 corresponding to the two magnetic bearing stator assemblies 2 may be the same or different in tilt angle and size, and in one example, as shown in fig. 3 and 6, the two ramps 12 corresponding to the two magnetic bearing stator assemblies 2 are symmetrically disposed about the rotor 1. The inclined portion 12 may be provided separately from the rotor 1 and connected to the rotor 1 by clipping, bonding, connecting member connection, welding, or the like, and the inclined portion 12 and the rotor 1 may be integrally formed.
As shown in fig. 3 to 8, the magnetic poles 22 are provided with engaging portions 221 at ends thereof close to the inclined portion 12, the inclined portion 12 is provided corresponding to the engaging portions 221, an air gap 4 is formed between the inclined portion 12 and the engaging portions 221 so that the rotor 1 rotates in a non-contact manner with respect to the magnetic bearing stator assembly 2, and the engaging portions 221 and the magnetic poles 22 are integrally formed. The plurality of magnetic poles 22 are configured to apply an electromagnetic force to the rotor 1 through the engaging portion 221 when the exciting coil 23 is energized, the inclined portion 12 provides a point of application for the electromagnetic force generated by the magnetic poles 22, and the inclined portion 12 is configured to decompose the electromagnetic force into a first electromagnetic force in an axial direction of the rotor 1 and a second electromagnetic force in a radial direction of the rotor 1, the first electromagnetic force being configured to maintain an axial direction balance of the rotor 1, and the second electromagnetic force being configured to maintain a radial direction balance of the rotor 1.
The magnetic suspension bearing system of the present embodiment can maintain the axial direction balance and the radial direction balance of the rotor 1 only by the two magnetic bearing stator assemblies 2, and two radial degrees of freedom and a half axial degree of freedom can be controlled by the cooperation of one magnetic bearing stator assembly 2 and the corresponding inclined portion 12, and five degrees of freedom of the magnetic suspension bearing system can be controlled by the cooperation of the two magnetic bearing stator assemblies 2 and the corresponding inclined portion 12. Compared with the traditional five-degree-of-freedom magnetic suspension bearing system, the five-degree-of-freedom magnetic suspension bearing system omits an axial magnetic bearing, effectively shortens the length of the rotor 1, and reduces the internal space of the magnetic suspension motor occupied by the rotor 1, thereby reducing the volume of the magnetic suspension motor and lowering the production cost. Meanwhile, after the length of the rotor 1 is shortened, the rigidity of the rotor 1 can be greatly improved, the modal frequency can be improved, and the maximum rotating speed of the magnetic suspension motor can be improved.
In some embodiments, as shown in fig. 3 to 5, the rotor 1 is disposed in an inner ring of the stator core 21, the plurality of magnetic poles 22 are disposed on the inner ring of the stator core 21, the inclined portion 12 includes a first outer tapered surface 121, the fitting portion 221 includes a first inner tapered surface 201, and the first outer tapered surface 121 is parallel to the first inner tapered surface 201. The first outer tapered surface 121 is located inside the plurality of first inner tapered surfaces 201, and an annular air gap 4 is formed between the first outer tapered surface 121 and the plurality of first inner tapered surfaces 201. An included angle between the first outer conical surface 121 and the axial center line 25 of the rotor 1 is equal to an included angle between the first inner conical surface 201 and the axial center line 25 of the rotor 1. The magnetic pole 22 applies electromagnetic force to the rotor 1 through the first inner conical surface 201, and the force application direction is perpendicular to the first outer conical surface 121, and the first outer conical surface 121 decomposes the electromagnetic force into a first electromagnetic force along the axial direction of the rotor 1 and a second electromagnetic force along the radial direction of the rotor 1, so as to realize the positioning of the axial direction and the radial direction of the rotor 1.
The inclination direction of the first outer tapered surface 121 in this embodiment is not limited as long as the electromagnetic force applied by the magnetic pole 22 can be decomposed into the first electromagnetic force and the second electromagnetic force. In one example, as shown in fig. 3 and 4, the rotor 1 includes a rotor body 11, and the first outer tapered surface 121 is inclined from an outer wall surface of the rotor body 11 toward a center line 25 close to an axial direction of the rotor body 11. That is, the inclined portion 12 is a section of the rotor 1 that is tapered in radial dimension. When the rotor 1 is arranged inside the stator core 21, the first outer conical surface 121 is inclined in such a way that the structure of the rotor 1 is simplified, and the production process and the production cost of the rotor 1 are simplified.
In other embodiments, as shown in fig. 6 to 8, the rotor 1 has an outer rotor structure, the rotor 1 is cylindrical, the rotor 1 is disposed outside the outer ring of the stator core 21, and the plurality of magnetic poles 22 are disposed on the outer ring of the stator core 21. The angled portion 12 includes a second inner tapered surface 122, the mating portion 221 includes a second outer tapered surface 202, and the second inner tapered surface 122 is parallel to the second outer tapered surface 202. The plurality of second outer tapered surfaces 202 are all located within the second inner tapered surface 122, and an annular air gap 4 is formed between the plurality of second outer tapered surfaces 202 and the second inner tapered surface 122. The angle between the second inner tapered surface 122 and the axial center line 25 of the rotor 1 is equal to the angle between the second outer tapered surface 202 and the axial center line 25 of the rotor 1. The magnetic poles 22 apply electromagnetic force to the rotor 1 through the second outer conical surface 202, and the direction of the applied force is perpendicular to the second inner conical surface 122, and the second inner conical surface 122 decomposes the electromagnetic force into a first electromagnetic force along the axial direction of the rotor 1 and a second electromagnetic force along the radial direction of the rotor 1, so as to realize the positioning of the axial direction and the radial direction of the rotor 1.
The inclination direction of the second inner tapered surface 122 in this embodiment is not limited, as long as the electromagnetic force applied by the magnetic pole 22 can be decomposed into the first electromagnetic force and the second electromagnetic force. In one example, as shown in fig. 6 and 7, the rotor 1 includes a rotor body 11, and the second inner tapered surface 122 is obliquely arranged from the inner wall of the rotor body 11 to a direction away from the center line 25 of the axial direction of the rotor body 11. That is, the inclined portion 12 is a section of the rotor 1 that is tapered in radial dimension. When the rotor 1 is disposed outside the stator core 21, the second inner tapered surface 122 is inclined in such a manner as to simplify the structure of the rotor 1, simplify the production process of the rotor 1, and reduce the production cost of the rotor 1.
The outer tapered surface defined in the present embodiment refers to a structure in which the tapered surface is provided in a convex manner, and the inner tapered surface refers to a structure in which the tapered surface is provided in a concave manner. For example, the first outer tapered surface 121 is protruded from the inclined portion 12, and the first inner tapered surface 201 is recessed from the mating portion 221. Similarly, the second inner tapered surface 122 is concavely disposed on the inclined portion 12, and the second outer tapered surface 202 is convexly disposed on the matching portion 221.
According to an exemplary embodiment of the present disclosure, the present embodiment includes all of the above embodiments except that the present embodiment defines the currents for adjusting the axial degree of freedom and the radial degree of freedom in the exciting coil 23.
In some embodiments, the excitation coil 23 wound on the magnetic pole 22 includes a first coil (not shown) and a second coil (not shown), and the first coil and the second coil are independent from each other. In this embodiment, the winding manner of the first coil and the second coil on the magnetic pole 22 is not limited, and the first coil and the second coil may be wound on the magnetic pole 22 side by side, or the first coil may be wound on the second coil, or the second coil may be wound on the first coil. The number of turns of the first coil and the second coil wound on the magnetic pole 22 may be the same or different, and the number of turns of the first coil and the second coil may be adjusted according to the magnitude of the current flowing through the first coil and the second coil. Different currents flow in the first coil and the second coil, wherein a first current flows in the first coil and is used for adjusting the radial degree of freedom of the rotor 1. A second current flows in the second coil, and the second current is used for adjusting the axial degree of freedom of the rotor 1. The magnitudes of the first current and the second current are determined by a controller of the magnetic suspension bearing system, and the purpose of controlling the position of the rotor 1 is realized by adjusting the magnitudes of the first current and the second current.
In other embodiments, the currents flowing in the field coil 23 wound on the magnetic pole 22 include a first current, a second current, and a third current, and the first current is used as the operating point current of the rotor 1. The operating point current in this embodiment is a current required when the magnetic bearing assembly stator assembly 2 keeps the rotor 1 stably floating, considering only the self-weight of the rotor 1 and the static load applied to the rotor 1 when the external force is zero, and the current required to maintain the floating state is the operating point current. When the rotor 1 deviates from the suspension state, the measurement system feeds back to the controller, and the controller adjusts the current input to the magnetic bearing stator assembly 2 for correction. The second current is used to adjust the radial degree of freedom of the rotor 1 and the third current is used to adjust the axial degree of freedom of the rotor 1. A first current, a second current and a third current are simultaneously conducted in the excitation coil 23, and the magnitudes of the first current, the second current and the third current are determined by a controller of the magnetic bearing system.
According to an exemplary embodiment of the present disclosure, as shown in fig. 5 and 8, the present embodiment includes all of the above embodiments except that the plurality of magnetic poles 22 include first and second magnetic poles 241 and 242, and the first and second magnetic poles 241 and 242 are alternately disposed. Every two adjacent first magnetic poles 241 and second magnetic poles 242 form a magnetic pole pair 24, the first magnetic pole 241 and the second magnetic pole 242 belonging to the same magnetic pole pair 24 are opposite in magnetism, and the two adjacent first magnetic poles 241 and second magnetic poles 242 belonging to different magnetic pole pairs 24 are identical in magnetism, so that the magnetic circuit directions of the control magnetic fluxes in the adjacent magnetic pole pairs 24 are opposite, and the control magnetic flux coupling of the adjacent magnetic pole pairs 24 is reduced. The number of the magnetic pole pairs 24 is not limited in this embodiment, and may be a multiple of 3 or a multiple of 4, for example, the number of the magnetic pole pairs 24 may be three, four, six, eight, twelve, sixteen, etc., and the number of the magnetic pole pairs 24 may be flexibly determined according to the performance and production cost aspects required by the magnetic bearing stator assembly 2. The present embodiment is not limited to the arrangement of the plurality of magnetic pole pairs 24 on the stator core 21, and in some embodiments, the plurality of magnetic pole pairs 24 are symmetrically arranged about the center line 25 of the rotor 1 in the axial direction to better maintain the balanced state of the rotor 1. In the present embodiment, the two magnetic pole pairs 24 that are located in the same magnetic bearing stator assembly 2 and are arranged opposite to each other are differentially controlled to differentially correct the displacement of the rotor 1 in the radial direction, thereby achieving the radial balance of the rotor 1. Two magnetic pole pairs 24 symmetrically arranged on the left and right sides of the rotor 1 in different magnetic bearing stator assemblies 2 are differentially controlled to differentially correct the displacement of the rotor 1 in the axial direction, so as to realize the axial balance of the rotor 1.
The principle of maintaining the axial balance and the radial balance of the rotor 1 in the present embodiment is explained in detail by taking a magnetic suspension bearing system in which the rotor 1 is located in the inner ring of the stator core 21 as an example.
Fig. 9 shows an exploded view of the magnetic bearing stator assembly 2 against the magnetic field force of the rotor 1. The magnetic pole 22 applies an electromagnetic force F to the inclined portion 12 of the rotor 1 via the engaging portion 221, where F is perpendicular to the inclined portion 12, and the inclined portion 12 decomposes the electromagnetic force F into a first electromagnetic force F in the axial direction of the rotor 1 t And a second electromagnetic force F in the radial direction of the rotor 1 r First electromagnetic force F t For achieving axial positioning of the rotor 1, a second electromagnetic force F r For achieving radial positioning of the rotor 1. In the same magnetic bearing stator assembly 2The electromagnetic force applied to the rotor 1 by the oppositely arranged magnetic poles 22 is decomposed by the second electromagnetic force F of the inclined part 12 r The directions are opposite, and therefore, the balance in the radial direction of the rotor 1 can be achieved by differentially controlling the magnetic pole pairs 24 provided in the same magnetic bearing stator assembly 2 in opposition to each other. And the electromagnetic force exerted by all the magnetic poles 22 in the same magnetic bearing stator assembly 2 on the rotor 1 is decomposed by the first electromagnetic force F of the inclined part 12 t The directions are the same, and the magnetic poles 22 of the stator assemblies 2 positioned at different magnetic bearings apply first electromagnetic force F to the rotor 1, which is decomposed by the inclined part 12 t Since the directions are opposite to each other, the magnetic pole pairs 24 symmetrically provided on the left and right sides of the rotor 1 in the different magnetic bearing stator assemblies 2 are differentially controlled, whereby the axial balance of the rotor 1 can be achieved. The principle of the magnetic bearing system of the rotor 1 outside the outer ring of the stator core 21 for maintaining the axial balance and the radial balance of the rotor 1 is similar and will not be described in detail herein.
According to an exemplary embodiment of the present disclosure, a magnetic levitation motor is further provided in this embodiment, and the magnetic levitation motor of this embodiment includes the magnetic levitation bearing system provided in any one of the embodiments. The magnetic suspension motor of the embodiment can still realize five-degree-of-freedom magnetic suspension support under the condition of canceling the axial magnetic bearing, effectively shortens the length of the rotor, and reduces the internal space of the magnetic suspension motor occupied by the rotor, thereby reducing the volume of the magnetic suspension motor and lowering the production cost. Meanwhile, after the length of the rotor is shortened, the rigidity of the rotor 1 can be greatly improved, the modal frequency can be improved, and the maximum rotating speed of the magnetic suspension motor can be improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The magnetic suspension bearing system is characterized by comprising a rotor (1) and two magnetic bearing stator assemblies (2) which are respectively arranged on the left side and the right side of the rotor (1), wherein the two magnetic bearing stator assemblies (2) are symmetrically arranged on the left side and the right side of the rotor (1);
each magnetic bearing stator assembly (2) comprises a stator core (21) and a plurality of magnetic poles (22) arranged on the stator core (21), and magnet exciting coils (23) are respectively wound on the magnetic poles (22);
inclined parts (12) are respectively arranged at positions of the rotor (1) corresponding to the two magnetic bearing stator assemblies (2), one ends of the magnetic poles (22) close to the inclined parts (12) are respectively provided with a matching part (221), the inclined parts (12) are arranged corresponding to the matching parts (221), and an air gap (4) is formed between the inclined parts (12) and the matching parts (221);
the plurality of magnetic poles (22) are configured to apply electromagnetic force to the rotor (1) through the fitting portion (221) when the exciting coil (23) is energized, and the inclined portion (12) is configured to decompose the electromagnetic force into a first electromagnetic force in an axial direction of the rotor (1) and a second electromagnetic force in a radial direction of the rotor (1).
2. A magnetic bearing system according to claim 1, characterized in that the rotor (1) is arranged in an inner ring of the stator core (21), a plurality of the poles (22) being arranged on the inner ring of the stator core (21),
the inclined portion (12) comprises a first outer conical surface (121), the fitting portion (221) comprises a first inner conical surface (201), and the first outer conical surface (121) is parallel to the first inner conical surface (201).
3. A magnetic bearing system according to claim 2, characterized in that the rotor (1) comprises a rotor body (11), and the first outer conical surface (121) is arranged obliquely from the outer wall of the rotor body (11) towards the centre line (25) close to the axial direction of the rotor body (11).
4. A magnetic bearing system according to claim 1, characterized in that the rotor (1) is arranged outside the outer ring of the stator core (21), and a plurality of magnetic poles (22) are arranged on the outer ring of the stator core (21);
the angled portion (12) includes a second inner tapered surface (122), and the mating portion (221) includes a second outer tapered surface (202), the second inner tapered surface (122) being parallel to the second outer tapered surface (202).
5. A magnetic bearing system according to claim 4, characterized in that the rotor (1) comprises a rotor body (11), and the second inner conical surface (122) is arranged obliquely from the inner wall of the rotor body (11) facing away from the centre line (25) of the axial direction of the rotor body (11).
6. A magnetic bearing system according to claim 1, characterized in that the two ramps (12) corresponding to the two magnetic bearing stator assemblies (2) are arranged symmetrically with respect to the rotor (1).
7. A magnetic bearing system according to claim 1, characterized in that the excitation coil (23) comprises a first coil and a second coil, the first coil and the second coil being independent of each other; a first current circulates in the first coil, and the first current is used for adjusting the radial degree of freedom of the rotor (1);
a second current flows in the second coil, and the second current is used for adjusting the axial degree of freedom of the rotor (1).
8. A magnetic bearing system according to claim 1, characterized in that the currents circulating in the excitation coil (23) comprise a first current for the operating point current of the rotor (1), a second current for adjusting the radial degree of freedom of the rotor (1) and a third current for adjusting the axial degree of freedom of the rotor (1).
9. A magnetic bearing system according to any of claims 1-8, characterized in that the plurality of magnetic poles (22) comprises first magnetic poles (241) and second magnetic poles (242), the first magnetic poles (241) alternating with the second magnetic poles (242); every two adjacent first magnetic poles (241) and second magnetic poles (242) form a magnetic pole pair (24), the magnetism of the first magnetic pole (241) and the second magnetic pole (242) belonging to the same magnetic pole pair (24) is opposite, and the magnetism of the two adjacent first magnetic poles (241) and second magnetic poles (242) belonging to different magnetic pole pairs (24) is the same;
in the same magnetic bearing stator assembly (2), two magnetic pole pairs (24) which are oppositely arranged are controlled in a differential mode;
in different magnetic bearing stator components (2), two magnetic pole pairs (24) symmetrically arranged on the left side and the right side of the rotor (1) are controlled in a differential mode.
10. A magnetic levitation motor comprising a magnetic levitation bearing system as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310092178.2A CN115853901A (en) | 2023-02-10 | 2023-02-10 | Magnetic suspension bearing system and magnetic suspension motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310092178.2A CN115853901A (en) | 2023-02-10 | 2023-02-10 | Magnetic suspension bearing system and magnetic suspension motor |
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| Publication Number | Publication Date |
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| CN115853901A true CN115853901A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310092178.2A Pending CN115853901A (en) | 2023-02-10 | 2023-02-10 | Magnetic suspension bearing system and magnetic suspension motor |
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| Country | Link |
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| CN (1) | CN115853901A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116123216A (en) * | 2023-04-17 | 2023-05-16 | 山东华东风机有限公司 | Magnetic bearing system based on radial-axial coupling magnetic bearing, control method and system |
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Application publication date: 20230328 |