CN108809024B - Axial single-degree-of-freedom bearingless switched reluctance motor - Google Patents
Axial single-degree-of-freedom bearingless switched reluctance motor Download PDFInfo
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- CN108809024B CN108809024B CN201810702170.2A CN201810702170A CN108809024B CN 108809024 B CN108809024 B CN 108809024B CN 201810702170 A CN201810702170 A CN 201810702170A CN 108809024 B CN108809024 B CN 108809024B
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- rotor
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- 239000000725 suspension Substances 0.000 claims abstract description 44
- 238000004804 winding Methods 0.000 claims abstract description 26
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 14
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 12
- 238000005339 levitation Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005299 abrasion Methods 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
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/145—Stator cores with salient poles having an annular coil, e.g. of the claw-pole type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/246—Variable reluctance rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2793—Rotors axially facing stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/12—Transversal flux machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention discloses an axial single-degree-of-freedom bearingless switched reluctance motor which comprises a rotor and a stator, wherein the rotor comprises a rotating shaft and a radial rotor iron core sleeved on the rotating shaft, the outer circumference of the radial rotor iron core is connected with an axial rotor iron core through a radial magnetized permanent magnet ring, and a plurality of rotor teeth are uniformly arranged at two ends of the axial rotor iron core respectively; the stator comprises two stator cores symmetrically arranged on two sides of the rotor, each stator core is composed of an integrated axial portion and a radial portion, 4 suspension teeth are evenly arranged at the inner end of the axial portion, and a plurality of torque teeth are evenly distributed on an axial magnetic isolating block arranged between adjacent suspension teeth, suspension windings and torque windings are respectively wound on the suspension teeth and the torque teeth, and the end portions of the rotating shafts extend to the outer sides of the stator cores. The motor with the structure has small volume, light weight and compact structure, and provides a new solution for special electric transmission.
Description
Technical Field
The invention relates to the field of magnetic suspension motors of a bearingless technology, in particular to an axial single-degree-of-freedom bearingless switched reluctance motor.
Background
The bearingless motor has no friction and abrasion, does not need lubrication and sealing, is easy to realize higher rotating speed and higher power operation, and has wide application prospect in the fields of aerospace, turbo molecular pumps, flywheel energy storage, sealing pumps, high-speed electric spindles and the like. The bearingless motor is mainly divided into a bearingless asynchronous (induction) motor, a bearingless permanent magnet synchronous motor and a bearingless switched reluctance motor. Particularly, the bearingless switched reluctance motor has the advantages of simple structure, high mechanical strength, flexible control, good fault tolerance performance, good robustness and the like, and has wide application prospects in the fields of electric automobiles, general industries, household appliances and the like.
In order to realize the stable suspension of the rotor of the bearingless switched reluctance motor, active control force must be applied to four degrees of freedom in the radial direction and one degree of freedom in the axial direction simultaneously. The traditional five-degree-of-freedom bearingless switched reluctance motor generally has the following three structures:
1. the magnetic bearing comprises 1 bearing magnetic bearing and 2 two-degree-of-freedom bearingless switched reluctance motors;
2. the magnetic bearing comprises an axial magnetic bearing, 1 radial magnetic bearing and a two-degree-of-freedom bearingless switched reluctance motor;
3. the magnetic bearing comprises 1 three-degree-of-freedom radial-axial magnetic bearing and 1 bearingless switched reluctance motor;
the three structures all need to adopt an axial magnetic bearing independently, the axial length of the system is increased, the critical rotating speed of the system is reduced, the further improvement of the rotating speed and the power is limited, two sets of windings, namely a suspension winding and a torque winding, are wound on each stator tooth of the traditional bearingless switched reluctance motor, the number of pole pairs of the two sets of windings must meet the plus-minus relationship, the torque and the suspension force are generated simultaneously by coordinately controlling the currents of the torque winding and the suspension winding, and strong coupling exists between the torque control and the suspension control.
Disclosure of Invention
The invention aims to provide an axial single-degree-of-freedom bearingless switched reluctance motor which is small in size, light in weight and compact in structure, and provides a new solution for special electric transmission.
The invention is realized by the following technical scheme:
an axial single-degree-of-freedom bearingless switched reluctance motor comprises a rotor and a stator, wherein the rotor comprises a rotating shaft and a radial rotor iron core sleeved on the rotating shaft, the outer circumference of the radial rotor iron core is connected with an axial rotor iron core through a radial magnetized permanent magnet ring, and a plurality of rotor teeth are uniformly arranged at two ends of the axial rotor iron core respectively; the stator comprises two stator cores symmetrically arranged on two sides of the rotor, each stator core is composed of an integrated axial portion and a radial portion, 4 suspension teeth are evenly arranged at the inner end of the axial portion, and a plurality of torque teeth are evenly distributed on an axial magnetic isolating block arranged between adjacent suspension teeth, suspension windings and torque windings are respectively wound on the suspension teeth and the torque teeth, and the end portions of the rotating shafts extend to the outer sides of the stator cores.
The invention further provides that the tooth width and the tooth thickness of the rotor teeth are the same as those of the torque teeth.
The further scheme of the invention is that the tooth width of the suspension tooth is larger than that of the torque tooth and is larger than one pole pitch of the motor.
The invention further adopts the scheme that the permanent magnet ring is made of a rare earth permanent magnet or a ferrite permanent magnet.
Compared with the prior art, the invention has the advantages that:
a permanent magnet ring magnetized along the radial direction and positioned between an axial rotor iron core and a radial rotor iron core provides bias magnetic flux, and axial suspension windings on suspension teeth on a left stator and a right stator are electrified to generate axial suspension control magnetic flux and the bias magnetic flux to interact to generate axial suspension force for enabling the rotor to stably suspend; compared with a bearingless switched reluctance motor with two sets of windings arranged on each stator tooth, the suspension control and the torque control are mutually independent, the control is simple, and the realization is easy; compared with the common five-degree-of-freedom bearingless switch motor, the five-degree-of-freedom bearingless switch motor has the characteristics of shorter axial length, capability of realizing high-speed/ultrahigh-speed operation, fewer required displacement sensors, fewer driving circuits and simple control system hardware; the motor with the structure has small volume, light weight and compact structure, and provides a new solution for special electric transmission.
Drawings
Fig. 1 is an exploded view of the structure of the present invention.
Fig. 2 is a schematic view of the assembly structure of the present invention.
Fig. 3 is a front sectional view and a schematic magnetic flux diagram of the present invention.
Fig. 4 is an axial suspension principle diagram of the present invention.
Detailed Description
As shown in fig. 1 to 3, an axial single-degree-of-freedom bearingless switched reluctance motor, taking stator teeth number/rotor teeth number 12/14 as an example, includes a rotor and a stator, where the rotor includes a rotating shaft 4 and a radial rotor core 2 sleeved on the rotating shaft 4, an outer circumference of the radial rotor core 2 is connected to an axial rotor core 1 through a radially magnetized permanent magnet ring 3, and fourteen rotor teeth 5 are uniformly arranged at two ends of the axial rotor core 1 respectively; the stator comprises two stator iron cores 6 symmetrically arranged on two sides of the rotor, each stator iron core 6 consists of an axial part and a radial part which are integrated, four suspension teeth 7 facing the rotor teeth 5 are uniformly arranged in the x direction and the y direction of the inner end of the axial part, an axial magnetic isolating block 9 is arranged on the end surface of the stator iron core 6 between two adjacent suspension teeth 7, two torque teeth 8 are uniformly distributed on the surface of the axial magnetic isolating block 9 along the circumferential direction of the stator iron core 6, suspension windings 10 and torque windings 11 are respectively wound on the suspension teeth 7 and the torque teeth 8, the tooth width and the tooth thickness of the rotor teeth 5 are the same as those of the torque teeth 8, and the tooth width of the suspension teeth 7 is larger than that of the torque teeth 8, and one pole pitch of the motor; both ends of the rotary shaft 4 extend to the outside of the stator core 6.
The permanent magnet ring 3 is made of a rare earth permanent magnet or a ferrite permanent magnet; the suspension winding 10 and the torque winding 11 are concentrated windings and are formed by winding an electromagnetic coil with good electric conductivity and then dipping paint and drying; the axial rotor core 1, the radial rotor core 2, the stator core 6, the suspension teeth 7, the torque teeth 8 and the rotor teeth 5 are all made of materials with good magnetic conductivity.
The suspension principle is as follows:
the permanent magnet ring 3 generates a left offset magnetic flux 12 and a right offset magnetic flux 13, wherein the left offset magnetic flux 12 starts from an N pole of the permanent magnet ring 3, and forms a closed path along a rotor tooth facing to four suspension teeth on the left side of the axial rotor core 1, an air gap between the axial rotor core 1 and the left stator core 6, the suspension teeth on the left stator core 6, an air gap between the left stator core 6 and the radial stator core 2, and an S pole of the radial rotor core 2 returning to the permanent magnet ring; the right offset magnetic flux 13 starts from the N pole of the permanent magnet ring 3, and forms a closed path along the rotor teeth right opposite to the four suspension teeth on the right side of the axial rotor core 1, the air gap between the axial rotor core 1 and the right stator core 6, the suspension teeth on the right stator core 6, the air gap between the right stator core 6 and the radial stator core 2, and the S pole of the radial rotor core 2 returning to the permanent magnet ring.
The levitation control magnetic flux 14 generated by energizing the levitation winding 10 returns to the levitation tooth on the left stator core 6 through the levitation teeth on the left stator core 6, the air gap between the left stator core 6 and the radial stator core 2, the air gap between the radial stator core 2 and the right stator core 6, the levitation teeth on the right stator core 6, the air gap between the levitation teeth on the right stator core 6 and the axial rotor core 1, the left rotor teeth of the axial rotor core 1, and the air gap between the left rotor teeth of the axial rotor core 1 and the levitation teeth on the left stator core 6, and then returns to the levitation teeth on the left stator core 6 to form a closed loop.
The suspension control magnetic flux 14 adjusts the left bias magnetic flux 12 and the right bias magnetic flux 13 to generate axial suspension force; according to the prior art, displacement sensors are respectively installed on stator cores 6 on the left side and the right side to establish a displacement closed-loop system, when a rotor deviates from a balance position, the current values of an axial suspension winding and a radial suspension winding are adjusted through sensor feedback, suspension force enabling the rotor to return to the balance position is generated, and stable suspension of the rotor in the axial direction and the radial direction is achieved.
The rotation principle is as follows:
the torque windings 11 on the left and right stator cores 6 are connected in series or in parallel in the same direction, the torque windings 11 are divided into a plurality of phases, a torque winding magnetic field generated by electrifying any two phases forms a closed path between a torque tooth and a rotor tooth, and torque force for rotating the rotor is generated.
Claims (4)
1. The utility model provides an axial single degree of freedom does not have bearing switched reluctance motor, includes rotor and stator, its characterized in that: the rotor comprises a rotating shaft (4) and a radial rotor core (2) sleeved on the rotating shaft (4), the outer circumference of the radial rotor core (2) is connected with an axial rotor core (1) through a radial magnetized permanent magnet ring (3), and a plurality of rotor teeth (5) are uniformly arranged at two ends of the axial rotor core (1) respectively; the stator includes that the symmetry sets up in two stator core (6) of rotor both sides, and each stator core (6) comprises axial portion and radial portion, the inner of axial portion evenly is provided with four suspension tooth (7) to and evenly distributed is at several torque tooth (8) that set up on axial magnetic separation piece (9) between adjacent suspension tooth (7), suspension winding (10), torque winding (11) have been twined respectively on suspension tooth (7), torque tooth (8), the tip of pivot (4) extends to the outside of stator core (6).
2. The axial single degree of freedom bearingless switched reluctance motor of claim 1 wherein: the tooth width and the tooth thickness of the rotor teeth (5) are the same as those of the torque teeth (8).
3. The axial single degree of freedom bearingless switched reluctance motor of claim 1 wherein: the tooth width of the suspension teeth (7) is larger than that of the torque teeth (8) and is larger than one pole pitch of the motor.
4. The axial single degree of freedom bearingless switched reluctance motor of claim 1 wherein: the permanent magnet ring (3) is made of a rare earth permanent magnet or a ferrite permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810702170.2A CN108809024B (en) | 2018-06-30 | 2018-06-30 | Axial single-degree-of-freedom bearingless switched reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810702170.2A CN108809024B (en) | 2018-06-30 | 2018-06-30 | Axial single-degree-of-freedom bearingless switched reluctance motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108809024A CN108809024A (en) | 2018-11-13 |
| CN108809024B true CN108809024B (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810702170.2A Active CN108809024B (en) | 2018-06-30 | 2018-06-30 | Axial single-degree-of-freedom bearingless switched reluctance motor |
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| Country | Link |
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| CN (1) | CN108809024B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202304B (en) * | 2020-10-19 | 2021-07-27 | 华中科技大学 | Full-freedom-degree alternating pole bearingless motor and active control method thereof |
| CN116169801B (en) * | 2022-12-23 | 2023-12-01 | 南京航空航天大学 | Three-degree-of-freedom suspension bearingless doubly salient motor and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715945A (en) * | 2013-12-20 | 2014-04-09 | 北京航空航天大学 | 12/14 bearingless permanent magnet biased switched reluctance motor |
| CN104265761A (en) * | 2014-09-11 | 2015-01-07 | 江苏大学 | Novel axial-radial three-degree-of-freedom hybrid magnetic bearing |
| CN206524695U (en) * | 2016-12-23 | 2017-09-26 | 江苏大学 | A kind of bearing-free permanent magnet thin-sheet motor |
-
2018
- 2018-06-30 CN CN201810702170.2A patent/CN108809024B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715945A (en) * | 2013-12-20 | 2014-04-09 | 北京航空航天大学 | 12/14 bearingless permanent magnet biased switched reluctance motor |
| CN104265761A (en) * | 2014-09-11 | 2015-01-07 | 江苏大学 | Novel axial-radial three-degree-of-freedom hybrid magnetic bearing |
| CN206524695U (en) * | 2016-12-23 | 2017-09-26 | 江苏大学 | A kind of bearing-free permanent magnet thin-sheet motor |
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| Publication number | Publication date |
|---|---|
| CN108809024A (en) | 2018-11-13 |
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Application publication date: 20181113 Assignee: Huai'an runke Tianxia Technology Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2021980013325 Denomination of invention: An axial single degree of freedom Bearingless Switched Reluctance Motor Granted publication date: 20200526 License type: Common License Record date: 20211129 |
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Effective date of registration: 20240103 Address after: No. 58, Group 9, Liuhu Village, Jiukou Town, Zhongxiang City, Jingmen City, Hubei Province, 431900 Patentee after: Pan Jinzhong Address before: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee before: Dragon totem Technology (Hefei) Co.,Ltd. Effective date of registration: 20240103 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: 223100 A12-2, high tech Industrial Park, three East seven street, Hongze District, Huaian, Jiangsu (Hongze technology transfer center Hongze sub center) Patentee before: HUAIYIN INSTITUTE OF TECHNOLOGY |