CN209892624U - Electromagnetic radial magnetic bearing with E-shaped structure - Google Patents
Electromagnetic radial magnetic bearing with E-shaped structure Download PDFInfo
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- CN209892624U CN209892624U CN201920546643.4U CN201920546643U CN209892624U CN 209892624 U CN209892624 U CN 209892624U CN 201920546643 U CN201920546643 U CN 201920546643U CN 209892624 U CN209892624 U CN 209892624U
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- 239000000725 suspension Substances 0.000 claims abstract description 73
- 238000004804 winding Methods 0.000 claims abstract description 28
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 31
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000005389 magnetism Effects 0.000 abstract 1
- 238000005339 levitation Methods 0.000 description 10
- 230000005284 excitation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model discloses an electromagnetic radial magnetic bearing with an E-shaped structure, wherein a stator of the electromagnetic radial magnetic bearing is composed of four E-shaped structures and four magnetic isolation plates, the E-shaped structures and the magnetic isolation plates are alternately arranged, and a rotor is in a cylindrical structure; the number of teeth of each E-shaped structure is 3, the E-shaped structure comprises 1 wide tooth and 2 narrow teeth, and the wide teeth are positioned in the middle of the 2 narrow teeth; the included angle between the wide tooth of each E-shaped structure and 2 narrow teeth of each E-shaped structure is equal; each magnetism isolating plate is closely arranged with two adjacent narrow teeth to form a combined tooth; each combined tooth is wound with 1 bias coil, and each wide tooth is wound with 1 radial suspension coil; the bias winding is used for generating bias magnetic flux, and the radial suspension winding is used for controlling the magnitude and the direction of suspension force. The two radial suspension forces of the utility model are structurally decoupled naturally, the control is simple, and the suspension precision is high; the bias magnetic flux is convenient to adjust, the radial bearing capacity is large, and the inherent rigidity is large; in addition, because no permanent magnet is arranged, the manufacturing and the assembly are simple, the cost is low, and the adaptability to the working environment is strong.
Description
Technical Field
The invention relates to an electromagnetic radial magnetic bearing with an E-shaped structure, belonging to the field of magnetic suspension bearings.
Background
The magnetic suspension bearing has the excellent characteristics of no friction, no abrasion, no need of sealing lubrication, high speed, high precision, long service life, low maintenance cost and the like, and can effectively solve the bearing supporting problem of the high-speed motor. Magnetic bearings can be generally classified into a passive type and an active type according to whether a levitation force can be actively controlled. The active magnetic bearing realizes the suspension of a rotating shaft through controlling the electromagnetic force between the stator and the rotor, and is widely applied in the field of high-speed motors. The active magnetic bearing is classified into an electromagnetic type and a hybrid type according to a bias magnetic field establishment method. The bias and control magnetic flux of the electromagnetic magnetic bearing are both generated by an electromagnet, and the bias and control magnetic flux are generated by using the same coil or two independent coils, so that the electromagnetic magnetic bearing has the characteristics of large bearing capacity, adjustable rigidity, flexible control and the like, and has strong adaptability in severe environments such as high temperature and the like.
Disclosure of Invention
The invention provides an electromagnetic radial magnetic bearing with an E-shaped structure for overcoming the defects of the prior art. The stator of the magnetic bearing is composed of four E-shaped structures and four magnetic isolation plates, and magnetic circuits between the E-shaped structures are isolated from each other, so that two radial suspension force structures are naturally decoupled; the magnetic bearing comprises two winding types, one is a bias winding and is used for generating bias magnetic flux; the other is a radial suspension winding used for controlling the magnitude and the direction of the suspension force; the magnetic bearing has the advantages of simple control, high suspension precision, suitability for high-speed operation and the like, and has lower cost because of no permanent magnet.
In order to solve the problems, the invention adopts the technical scheme that:
an electromagnetic radial magnetic bearing with an E-shaped structure comprises a stator, a rotor, a bias coil and a radial suspension coil;
the stator consists of 4E-shaped structures and 4 magnetic isolation plates, and the 4E-shaped structures and the 4 magnetic isolation plates are alternately arranged; the 4E-shaped structures are uniformly distributed, and the phase difference is 90 degrees in space, wherein 2E-shaped structures are positioned in the horizontal direction, and the rest 2E-shaped structures are positioned in the vertical direction; the number of teeth of each E-shaped structure is 3, the E-shaped structure comprises 1 wide tooth and 2 narrow teeth, and the wide teeth are positioned in the middle of the 2 narrow teeth; the included angles between the wide teeth of the E-shaped structure and the 2 narrow teeth of the E-shaped structure are equal; each magnetic isolation plate is closely arranged with two adjacent narrow teeth to form a combined tooth, and the number of the combined teeth is 4;
the rotor is of a cylindrical structure and is arranged in the stator;
each combined tooth is wound with 1 bias coil, and the total number of the bias coils is 4; 4 bias coils are connected in series to form 1 bias winding;
each wide tooth is wound with 1 radial suspension coil, and the number of the radial suspension coils is 4, wherein two radial suspension coils are positioned in the horizontal direction, and the rest two radial suspension coils are positioned in the vertical direction; two radial suspension coils in the horizontal direction are reversely connected in series to form 1 radial suspension winding in the horizontal direction; two radial suspension coils in the vertical direction are reversely connected in series to form 1 radial suspension winding in the vertical direction.
The bias winding adopts a constant conduction excitation mode, and generates a constant bias magnetic flux by applying direct current excitation. The two radial suspension windings are respectively driven by a bipolar converter to control the magnitude and direction of the current of the two radial suspension windings so as to generate radial suspension force with any magnitude and direction and further realize stable suspension of the rotor.
The invention has the beneficial effects that: the invention provides an electromagnetic radial magnetic bearing with an E-shaped structure, and by adopting the technical scheme of the invention, the following technical effects can be achieved:
(1) the permanent magnet is not needed, the manufacturing and the assembly are simple, the cost is low, and the adaptability to the working environment is strong;
(2) the bias winding provides bias magnetic flux, the bias magnetic flux is convenient to adjust, the radial bearing capacity is large, the inherent rigidity is large, and the high-power magnetic flux generator is suitable for high-power application occasions;
(3) the two radial suspension forces are structurally decoupled naturally, the control is simple, the suspension precision is high, and the two radial suspension forces have unique advantages in the field of high-speed motors.
Drawings
Fig. 1 is a three-dimensional structure diagram of an electromagnetic radial magnetic bearing of the E-type structure according to the present invention.
Fig. 2 is a magnetic flux distribution diagram of the electromagnetic radial magnetic bearing of the E-configuration of the present invention.
Description of reference numerals: in fig. 1 to 2, 1 is an E-type structure, 2 is a magnetic shield, 3 is a rotor, 4 is a bias coil, 5 is a radial levitation coil, 6, 7, 8 are positive directions of x, y, z axis direction coordinate axes, 9 is a bias magnetic flux, 10 is a levitation control magnetic flux generated by a horizontal radial levitation control, and 11 is a levitation control magnetic flux generated by a vertical radial levitation control.
Detailed Description
The technical scheme of the electromagnetic radial magnetic bearing with the E-shaped structure is described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the three-dimensional structure of the electromagnetic radial magnetic bearing with E-type structure of the present invention is schematically illustrated, wherein 1 is the E-type structure, 2 is the magnetic shield, 3 is the rotor, 4 is the bias coil, 5 is the radial suspension coil, 6, 7, 8 are the positive directions of the coordinate axes in the x, y, z directions, respectively, wherein the x axis coincides with the horizontal direction, and the y axis coincides with the vertical direction.
An electromagnetic radial magnetic bearing with an E-shaped structure comprises a stator, a rotor, a bias coil and a radial suspension coil;
the stator consists of 4E-shaped structures and 4 magnetic isolation plates, and the 4E-shaped structures and the 4 magnetic isolation plates are alternately arranged; the 4E-shaped structures are uniformly distributed, and the phase difference is 90 degrees in space, wherein 2E-shaped structures are positioned in the horizontal direction, and the rest 2E-shaped structures are positioned in the vertical direction; the number of teeth of each E-shaped structure is 3, the E-shaped structure comprises 1 wide tooth and 2 narrow teeth, and the wide teeth are positioned in the middle of the 2 narrow teeth; the included angles between the wide teeth of the E-shaped structure and the 2 narrow teeth of the E-shaped structure are equal; each magnetic isolation plate is closely arranged with two adjacent narrow teeth to form a combined tooth, and the number of the combined teeth is 4;
the rotor is of a cylindrical structure and is arranged in the stator;
each combined tooth is wound with 1 bias coil, and the total number of the bias coils is 4; 4 bias coils are connected in series to form 1 bias winding;
each wide tooth is wound with 1 radial suspension coil, and the number of the radial suspension coils is 4, wherein two radial suspension coils are positioned in the horizontal direction, and the rest two radial suspension coils are positioned in the vertical direction; two radial suspension coils in the horizontal direction are reversely connected in series to form 1 radial suspension winding in the horizontal direction; two radial suspension coils in the vertical direction are reversely connected in series to form 1 radial suspension winding in the vertical direction.
The bias winding adopts a constant conduction excitation mode, and generates a constant bias magnetic flux by applying direct current excitation. The two radial suspension windings are respectively driven by a bipolar converter, and the magnitude and the direction of the current of the two radial suspension windings are reasonably controlled to generate radial suspension force with any magnitude and direction, so that stable suspension of the rotor is realized.
As shown in fig. 2, the magnetic flux distribution diagram of the electromagnetic radial magnetic bearing of the E-type structure of the present invention is shown. Where, line 9 is a bias magnetic flux, line 10 is a levitation control magnetic flux generated by the horizontal radial levitation control, and line 11 is a levitation control magnetic flux generated by the vertical radial levitation control.
The bias magnetic flux is distributed in NNNN or SSSS, namely, the four bias coils generate magnetic fields with the same polarity, so that a wide tooth fit is needed to form a closed loop. The bias magnetic flux generated by the bias coil on each combined tooth has two magnetic circuits isolated from each other, and the path of each magnetic circuit comprises: narrow teeth, stator yoke, wide teeth, air gap, rotor, air gap, and narrow teeth.
The horizontal direction (x axis) radial suspension winding generates two mutually isolated suspension control magnetic fluxes with opposite polarities in the positive x axis direction and the negative x axis direction respectively, wherein the two suspension control magnetic fluxes form a closed loop through the wide teeth, the two stator yokes, the two narrow teeth and the two air gaps.
When the current shown in fig. 2 is applied to the radial suspension winding in the horizontal direction, the suspension control magnetic flux and the bias magnetic flux have the same direction in the positive direction of the x axis, and the magnetic flux in the air gap is enhanced; in the negative direction of the x axis, the suspension control magnetic flux is opposite to the bias magnetic flux in direction, so that the magnetic flux in the direction of the x axis is larger than the magnetic flux in the negative direction of the x axis, and further a radial suspension force in the positive direction of the x axis is generated. When the horizontal direction radial suspension winding applies current in the opposite direction, a radial suspension force in the x-axis negative direction is generated. Therefore, the magnitude and the direction of the current of the radial suspension winding in the horizontal direction are controlled, and the magnitude and the direction of the suspension force in the x-axis direction can be adjusted.
Similarly, the magnitude and the direction of the current of the radial suspension winding in the vertical direction (y axis) are controlled, and the magnitude and the direction of the suspension force in the y axis direction can be adjusted. Therefore, the magnitude and the direction of the currents of the two radial suspension windings are reasonably controlled, and a radial suspension force with controllable magnitude and direction can be generated, so that the radial suspension of the rotor is realized.
According to the requirement of radial bearing capacity, the magnitude of the bias magnetic flux is dynamically adjusted, and then the current of the suspension winding is reasonably controlled, so that the electric energy conversion efficiency can be effectively improved, and the suspension power consumption can be reduced and the suspension precision can be improved.
In conclusion, the electromagnetic radial magnetic bearing with mutually isolated magnetic circuits is constructed, two radial suspension forces are structurally and naturally decoupled, the suspension control is simple, and the suspension precision is high; because the permanent magnet is not contained, the manufacturing and the assembly are simple, the cost is low, and the environmental adaptability is strong; the bias magnetic flux is convenient to adjust, is beneficial to improving the radial bearing capacity, has high inherent rigidity, and is particularly suitable for high-speed and high-power application occasions.
Other advantages and modifications will readily occur to those skilled in the art, based upon the above description. Therefore, the present invention is not limited to the above specific examples, and a detailed and exemplary description of one aspect of the present invention will be given by way of example only. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (1)
1. An electromagnetic radial magnetic bearing with an E-shaped structure comprises a stator, a rotor, a bias coil and a radial suspension coil; it is characterized in that the preparation method is characterized in that,
the stator consists of 4E-shaped structures and 4 magnetic isolation plates, and the 4E-shaped structures and the 4 magnetic isolation plates are alternately arranged; the 4E-shaped structures are uniformly distributed, and the phase difference is 90 degrees in space, wherein 2E-shaped structures are positioned in the horizontal direction, and the rest 2E-shaped structures are positioned in the vertical direction; the number of teeth of each E-shaped structure is 3, the E-shaped structure comprises 1 wide tooth and 2 narrow teeth, and the wide teeth are positioned in the middle of the 2 narrow teeth; the included angles between the wide teeth of the E-shaped structure and the 2 narrow teeth of the E-shaped structure are equal; each magnetic isolation plate is closely arranged with two adjacent narrow teeth to form a combined tooth, and the number of the combined teeth is 4;
the rotor is of a cylindrical structure and is arranged in the stator;
each combined tooth is wound with 1 bias coil, and the total number of the bias coils is 4; 4 bias coils are connected in series to form 1 bias winding;
each wide tooth is wound with 1 radial suspension coil, and the number of the radial suspension coils is 4, wherein two radial suspension coils are positioned in the horizontal direction, and the rest two radial suspension coils are positioned in the vertical direction; two radial suspension coils in the horizontal direction are reversely connected in series to form 1 radial suspension winding in the horizontal direction; two radial suspension coils in the vertical direction are reversely connected in series to form 1 radial suspension winding in the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920546643.4U CN209892624U (en) | 2019-04-22 | 2019-04-22 | Electromagnetic radial magnetic bearing with E-shaped structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920546643.4U CN209892624U (en) | 2019-04-22 | 2019-04-22 | Electromagnetic radial magnetic bearing with E-shaped structure |
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| CN209892624U true CN209892624U (en) | 2020-01-03 |
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| CN201920546643.4U Withdrawn - After Issue CN209892624U (en) | 2019-04-22 | 2019-04-22 | Electromagnetic radial magnetic bearing with E-shaped structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017329A (en) * | 2019-04-22 | 2019-07-16 | 南京埃克锐特机电科技有限公司 | A kind of E type structure electromagnetic type radial direction magnetic bearing |
| CN111425523A (en) * | 2020-02-28 | 2020-07-17 | 天津大学 | Hybrid radial permanent magnet biased magnetic bearing |
| CN113202869A (en) * | 2021-04-06 | 2021-08-03 | 南京邮电大学 | Three-degree-of-freedom hybrid bias magnetic bearing |
-
2019
- 2019-04-22 CN CN201920546643.4U patent/CN209892624U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017329A (en) * | 2019-04-22 | 2019-07-16 | 南京埃克锐特机电科技有限公司 | A kind of E type structure electromagnetic type radial direction magnetic bearing |
| CN110017329B (en) * | 2019-04-22 | 2024-05-17 | 南京埃克锐特机电科技有限公司 | Electromagnetic radial magnetic bearing with E-shaped structure |
| CN111425523A (en) * | 2020-02-28 | 2020-07-17 | 天津大学 | Hybrid radial permanent magnet biased magnetic bearing |
| CN113202869A (en) * | 2021-04-06 | 2021-08-03 | 南京邮电大学 | Three-degree-of-freedom hybrid bias magnetic bearing |
| CN113202869B (en) * | 2021-04-06 | 2023-08-22 | 南京邮电大学 | Three-degree-of-freedom hybrid bias magnetic bearing |
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Granted publication date: 20200103 Effective date of abandoning: 20240517 |
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Granted publication date: 20200103 Effective date of abandoning: 20240517 |