CN108599504B - Five-degree-of-freedom bearingless switched reluctance motor - Google Patents

Five-degree-of-freedom bearingless switched reluctance motor Download PDF

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Publication number
CN108599504B
CN108599504B CN201810702186.3A CN201810702186A CN108599504B CN 108599504 B CN108599504 B CN 108599504B CN 201810702186 A CN201810702186 A CN 201810702186A CN 108599504 B CN108599504 B CN 108599504B
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China
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axial
radial
teeth
rotor
torque
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CN201810702186.3A
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CN108599504A (en
Inventor
张涛
刘欣凤
王业琴
倪伟
桑英军
夏鑫
丁卫红
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Huaiyin Institute of Technology
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Huaiyin Institute of Technology
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Priority to CN201810702186.3A priority Critical patent/CN108599504B/en
Publication of CN108599504A publication Critical patent/CN108599504A/en
Priority to PCT/CN2019/091320 priority patent/WO2020001294A1/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K19/00Synchronous motors or generators
    • H02K19/02Synchronous motors
    • H02K19/10Synchronous motors for multi-phase current
    • H02K19/103Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/14Stator cores with salient poles
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/24Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246Variable reluctance rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • H02K1/272Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733Annular magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02NELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

The invention discloses a five-degree-of-freedom bearingless switched reluctance motor which comprises a stator and a rotor, wherein the rotor comprises a rotating shaft, an axial rotor iron core, a radial rotor iron core and radial rotor teeth, wherein two ends of the rotating shaft respectively extend to the outer side of the stator; the stator comprises two symmetrical stator cores, each stator core is composed of an axial stator core and a radial stator core which are integrated, axial suspension teeth and axial torque teeth are arranged at the inner end of the axial stator core, radial suspension teeth and radial torque teeth are arranged on the inner circumference of the radial stator core, and windings are wound on the axial suspension teeth, the axial torque teeth, the radial suspension teeth and the radial torque teeth respectively.

Description

Five-degree-of-freedom bearingless switched reluctance motor
Technical Field
The invention relates to the field of magnetic suspension motors of a bearingless technology, in particular to a five-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 axial 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 a five-freedom-degree 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:
a five-degree-of-freedom bearingless switched reluctance motor comprises a stator and a rotor, wherein the rotor comprises a rotating shaft, a first axial rotor iron core, a radial rotor iron core and radial rotor teeth, wherein two ends of the rotating shaft extend to the outer side of the stator respectively; the stator comprises two stator cores symmetrically arranged on two sides of the rotor, each stator core is composed of an axial stator core and a radial stator core which are integrated, a plurality of axial suspension teeth and a plurality of axial torque teeth are uniformly distributed on axial magnetic separation blocks arranged between adjacent axial suspension teeth at the inner end of the axial stator core, a plurality of radial suspension teeth which are right opposite to the radial rotor teeth and a plurality of radial torque teeth are uniformly distributed on the radial magnetic separation blocks arranged between adjacent radial suspension teeth, and the axial suspension teeth, the axial torque windings, the radial suspension windings and the radial torque windings are respectively wound on the axial suspension teeth, the axial torque windings, the radial suspension windings and the radial torque windings.
The invention has the further scheme that the tooth width and the tooth thickness of the axial rotor teeth and the radial rotor teeth are respectively the same as the tooth width and the tooth thickness of the axial torque teeth and the radial torque teeth.
The invention further adopts the scheme that the permanent magnet ring is made of a rare earth permanent magnet or a ferrite permanent magnet.
The further scheme of the invention is that the tooth width of the axial suspension tooth is larger than the tooth width of the axial torque tooth and the axial pole distance of the motor; the tooth width of the radial suspension teeth is larger than that of the radial torque teeth and the radial pole distance of the motor; the tooth widths of the axial torque tooth and the radial torque tooth are respectively the same as those of the axial rotor tooth and the radial rotor tooth, and the radial pole distance of the motor is equal to that of the axial rotor tooth.
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, an axial suspension winding on the axial stator iron core generates axial suspension control magnetic flux after being electrified, a radial suspension winding on the radial stator iron core generates radial suspension control magnetic flux after being electrified, and the radial suspension control magnetic flux and the axial suspension magnetic flux respectively interact with the bias magnetic flux to generate suspension force for stably suspending the rotor along the radial direction and the axial direction; 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-freedom-degree bearingless switch motor, the five-freedom-degree bearingless switch motor has the characteristics of shorter axial length, capability of realizing high-speed/ultrahigh-speed operation, less required displacement sensors, less 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 overall structural view of the present invention.
Fig. 2 is a left side stator and rotor structure view of the present invention.
Fig. 3 is an exploded view of the structure of the present invention.
Fig. 4 is a front view of the present invention.
Fig. 5 is a front view of a left stator and rotor structure of the present invention.
Fig. 6 is a left side view of the present invention.
Fig. 7 is a right side view of the left stator and rotor structure of the present invention.
Fig. 8 is a schematic view of the axial structure and magnetic flux of the present invention.
Fig. 9 is a schematic view of an axial stator, an axial rotor core structure, a winding arrangement and magnetic flux of the present invention.
Detailed Description
As shown in fig. 1 ~ 9, a five-degree-of-freedom bearingless switched reluctance motor is exemplified by that the radial stator tooth number/radial rotor tooth number and the axial stator tooth number/axial rotor tooth number of the motor are all 12/14, and includes a stator and a rotor, the rotor includes a rotating shaft 4 whose two ends extend to the outside of the stator respectively, a first axial rotor core 41 coaxially sleeved on the rotating shaft 4, a radial rotor core 2 located in the middle of the first axial rotor core 41 and rotating shaft bosses at the left and right ends, which are connected with the first axial rotor core 41 respectively, each of the rotating shaft bosses has 14 radial rotor teeth 21 uniformly distributed thereon, the outer circumference of the radial rotor core 2 is connected with a second axial rotor core 1 through a permanent magnet ring 3, and the two ends of the second axial rotor core 1 are uniformly provided with 14 axial rotor teeth 20 respectively.
The stator comprises two stator iron cores which are symmetrically arranged at the left side and the right side of the rotor, each stator iron core consists of an axial stator iron core 5 and a radial stator iron core 6 which are integrated, four axial suspension teeth 7 are uniformly arranged at the inner end of the axial stator core 5, the inner end of the axial stator core 5 between the adjacent axial suspension teeth 7 is connected with an aluminum axial magnetic isolating block 18, two axial torque teeth 9 are uniformly connected to the axial magnetic isolating block 18 along the circumferential direction of the axial stator core 5, four radial suspension teeth 11 facing the radial rotor teeth 21 are uniformly arranged on the inner circumference of the radial stator core 6 in the x direction and the y direction, an aluminum radial magnetic isolating block 42 is connected to the inner circumference of the radial stator core 6 between the adjacent radial suspension teeth 11, two radial torque teeth 13 are uniformly connected to the radial magnetic isolating block 42 along the circumferential direction of the radial stator core 6. The tooth widths and the tooth thicknesses of the axial rotor teeth 20 and the radial rotor teeth 21 are respectively the same as those of the axial torque teeth 9 and the radial torque teeth 13, the tooth widths of the axial suspension teeth 7 and the radial suspension teeth 11 are respectively larger than those of the axial torque teeth 9 and the radial torque teeth 13, and the axial polar distance and the radial polar distance of the motor are equal; the axial suspension teeth 7, the axial torque teeth 9, the radial suspension teeth 11 and the radial torque teeth 13 are respectively wound with axial suspension windings 8, axial torque windings 10, radial suspension windings 12 and radial torque windings 19, the axial suspension windings 8, the axial torque windings 10, the radial suspension windings 12 and the radial torque windings 19 are all concentrated windings, and the axial suspension windings, the axial torque windings, the radial torque windings and the radial torque windings are formed by winding and then dipping paint and drying by adopting electromagnetic coils with good electric conductivity.
The permanent magnet ring 3 is made of rare earth permanent magnets or ferrite permanent magnets, and the second axial rotor iron core 1, the radial rotor iron core 2, the axial stator iron core 5, the radial stator iron core 6, the axial suspension teeth 7, the radial suspension teeth 11, the axial torque teeth 9, the radial torque teeth 13, the axial rotor teeth 20, the radial rotor teeth 21 and the first axial rotor iron core 41 are all made of materials with good magnetic conductivity.
The suspension principle is as follows:
the permanent magnet ring 3 generates a left bias magnetic flux 14 and a right bias magnetic flux 15, wherein the left bias magnetic flux 14 starts from an N pole of the permanent magnet ring 3 and forms a closed path through an air gap between the second axial rotor core 1, the second axial rotor core 1 and the left axial stator core 5, an air gap between the left axial stator core 5, the radial stator core 6, an air gap between the radial stator core 6 and the first axial rotor core 41, the first axial rotor core 41 and an S pole of the radial rotor core 2 returning to the permanent magnet ring 3; the right offset magnetic flux 15 forms a closed path from the N pole of the permanent magnet ring 3 through the air gap between the second axial rotor core 1, and the right axial stator core 5, the radial stator core 6, the air gap between the radial stator core 6 and the first axial rotor core 41, and the S pole of the first axial rotor core 41 and the radial rotor core 2 returning to the permanent magnet ring 3.
The axial suspension winding 8 on the axial stator core 5 is electrified to generate an axial suspension control magnetic flux 16, the radial suspension winding 12 on the radial stator core 6 is electrified to generate a radial suspension control magnetic flux 17, and the radial suspension control magnetic flux 17 and the axial suspension control magnetic flux 16 respectively interact with the left bias magnetic flux 14 and the right bias magnetic flux 15 to generate suspension force for stably suspending the rotor in the radial direction and the axial direction. According to the prior art, displacement sensors are respectively arranged on an axial stator and a radial stator to establish a displacement closed-loop system, and 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 to generate suspension force for enabling the rotor to return to the balance position, so that the axial and radial stable suspension of the rotor is realized.
The rotation principle is as follows:
the axial torque windings 10 on the left and right axial stator cores 5 and the radial torque windings 19 on the left and right radial stator cores 6 are connected in series or in parallel in the same direction and then divided into a plurality of phases, and an axial torque winding magnetic field and a radial torque winding magnetic field generated by electrifying any two phases form a closed path between the axial torque teeth and the axial rotor teeth and between the radial torque teeth and the radial rotor teeth, so that a torque force for rotating the rotor is generated.

Claims (4)

1. The utility model provides a five degree of freedom does not have bearing switched reluctance motor, includes stator and rotor, its characterized in that: the rotor comprises a rotating shaft (4) with two ends extending to the outer side of the stator, a first axial rotor core (41) coaxially sleeved on the rotating shaft (4), a radial rotor core (2) and radial rotor teeth (21) which are connected to the middle part and two ends of the first axial rotor core (41) respectively, the outer circumference of the radial rotor core (2) is connected with a second axial rotor core (1) through a radial magnetized permanent magnet ring (3), and a plurality of axial rotor teeth (20) are uniformly arranged at two ends of the second axial rotor core (1) respectively; the stator comprises two stator cores symmetrically arranged on two sides of the rotor, each stator core is composed of an axial stator core (5) and a radial stator core (6) which are integrated, a plurality of axial suspension teeth (7) are uniformly arranged at the inner end of the axial stator core (5), a plurality of axial torque teeth (9) are uniformly distributed on an axial magnetic separation block (18) arranged between adjacent axial suspension teeth (7), a plurality of radial suspension teeth (11) which are just opposite to the radial rotor teeth (21) are uniformly arranged on the inner circumference of the radial stator core (6), and a plurality of radial torque teeth (13) are uniformly distributed on a radial magnetic separation block (42) arranged between adjacent radial suspension teeth (11), and axial suspension teeth (7), axial torque teeth (9), radial suspension teeth (11) and radial torque teeth (13) are respectively wound with axial suspension windings (8), Axial torque winding (10), radial suspension winding (12), radial torque winding (19).
2. The five-degree-of-freedom bearingless switched reluctance motor of claim 1, wherein: the tooth width and the tooth thickness of the axial rotor teeth (20) and the radial rotor teeth (21) are respectively the same as those of the axial torque teeth (9) and the radial torque teeth (13).
3. The five-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.
4. The five-degree-of-freedom bearingless switched reluctance motor of claim 1, wherein: the tooth width of the axial suspension teeth (7) is larger than that of the axial torque teeth (9) and the axial pole distance of the motor; the tooth width of the radial suspension tooth (11) is larger than that of the radial torque tooth (13) and the radial pole pitch of the motor; the tooth widths of the axial torque teeth (9) and the radial torque teeth (13) are respectively the same as those of the axial rotor teeth (20) and the radial rotor teeth (21), and the radial pole distance and the axial pole distance of the motor are equal.
CN201810702186.3A 2018-06-30 2018-06-30 Five-degree-of-freedom bearingless switched reluctance motor Active CN108599504B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201810702186.3A CN108599504B (en) 2018-06-30 2018-06-30 Five-degree-of-freedom bearingless switched reluctance motor
PCT/CN2019/091320 WO2020001294A1 (en) 2018-06-30 2019-06-14 Five-degree-of-freedom bearingless switched reluctance motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810702186.3A CN108599504B (en) 2018-06-30 2018-06-30 Five-degree-of-freedom bearingless switched reluctance motor

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CN108599504B true CN108599504B (en) 2019-12-31

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108599504B (en) * 2018-06-30 2019-12-31 淮阴工学院 Five-degree-of-freedom bearingless switched reluctance motor
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
CN113472241B (en) * 2021-07-19 2023-08-25 大连交通大学 Five-degree-of-freedom permanent magnet magnetic levitation motor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10062753A1 (en) * 1999-12-23 2001-10-04 Wolfgang Amrhein Electrical drive with permanent magnet excitation for nearly wattless generation of moments of torsion and any necessary carrying forces has a four-pole mechanical winding outside and a two-pole carrying winding inside.
US20040256935A1 (en) * 2003-06-19 2004-12-23 Andrew Kenny Magnetic bearing with permanent magnet poles
CN101220832B (en) * 2007-11-28 2010-06-09 江苏大学 Radial-axial mixed magnetic bearing driven by radial quadrupole biphase alternating current
CN102306995B (en) * 2011-08-26 2013-08-28 北京航空航天大学 Permanent magnet biased bearingless switched reluctance motor
CN106026615B (en) * 2016-06-08 2018-05-29 淮阴工学院 A kind of integrated suspension of five-freedom degree magnetic direct driving motor
CN106050918B (en) * 2016-06-08 2019-05-24 淮阴工学院 A kind of permanent magnet bias five degree of freedom integrated magnetic suspension support system
CN108599504B (en) * 2018-06-30 2019-12-31 淮阴工学院 Five-degree-of-freedom bearingless switched reluctance motor

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WO2020001294A1 (en) 2020-01-02

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Application publication date: 20180928

Assignee: Shanghai Yanqiao Information Technology Co.,Ltd.

Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY

Contract record no.: X2021980014312

Denomination of invention: A five degree of freedom Bearingless Switched Reluctance Motor

Granted publication date: 20191231

License type: Common License

Record date: 20211213

EE01 Entry into force of recordation of patent licensing contract