CN108599500B - Stator permanent magnet type outer rotor sheet bearingless asynchronous motor - Google Patents
Stator permanent magnet type outer rotor sheet bearingless asynchronous motor Download PDFInfo
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- CN108599500B CN108599500B CN201810702241.9A CN201810702241A CN108599500B CN 108599500 B CN108599500 B CN 108599500B CN 201810702241 A CN201810702241 A CN 201810702241A CN 108599500 B CN108599500 B CN 108599500B
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- permanent magnet
- winding
- outer rotor
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- 238000004804 winding Methods 0.000 claims abstract description 101
- 239000000725 suspension Substances 0.000 claims abstract description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 21
- 230000003068 static effect Effects 0.000 abstract description 10
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 7
- 230000004323 axial length Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
-
- 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
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a stator permanent magnet type outer rotor sheet-shaped bearingless asynchronous motor which comprises an outer rotor iron core and an inner stator of an inner ring of the outer rotor iron core, wherein the inner stator comprises a stator iron core, an axially magnetized cylindrical permanent magnet and a disc-shaped iron core bridge which are connected into a whole, the stator iron core is laminated on the left end surface of the cylindrical permanent magnet, the iron core bridge is laminated on the right end surface of the cylindrical permanent magnet, the axes of the stator iron core, the iron core bridge and the cylindrical permanent magnet are collinear, a stator slot is formed in the stator iron core, a torque winding and a suspension winding are arranged in the stator slot, and the radial length of the outer rotor iron core is greater than the. The cylindrical permanent magnet provides static bias magnetic flux for the motor, the suspension winding is powered by a direct-current power supply and provides suspension control magnetic flux for the motor, the suspension control magnetic flux adjusts the static bias magnetic flux, and radial suspension force is generated on the outer rotor.
Description
Technical Field
The invention relates to the technical field of motor manufacturing, in particular to a motor with compact structure, wherein the number of pole pairs of a torque winding and the number of pole pairs of a suspension winding only need to meet the requirementP m≠P bThe stator permanent magnet type outer rotor sheet-shaped bearingless asynchronous motor has the advantages of simple control, mutually independent suspension control and torque control, radial active suspension and axial passive suspension.
Background
The bearing-free motor has no friction, abrasion and lubrication, is easy to realize higher rotating speed and higher power operation, particularly has the advantages of simple structure and manufacture, high rotor strength, low manufacturing cost and the like, and has wide application prospect in series of high-speed direct drive fields such as high-speed machine tool spindle motors, sealing pumps, centrifuges, compressors, high-speed miniature hard disks and the like.
At present, a set of additional suspension windings are superposed on a torque winding of a stator slot of a traditional asynchronous motor, and the two sets of windings are respectively powered by three-phase alternating current power supplies with the same frequency to generate rotationThe number of pole pairs of the suspension winding magnetic field isP BTorque winding field ofP MOnly satisfy between the twoP B=P MIn the relation of +/-1, stable and controllable radial suspension force can be generated on the rotor. The radial displacement of the rotor is detected by a radial displacement sensor, a displacement closed-loop control system is constructed, stable suspension of the rotor is realized, and the torque generation principle is the same as that of a common asynchronous motor. On one hand, the torque winding magnetic field needs to interact with the suspension winding magnetic field to generate radial suspension force, and on the other hand, the torque winding magnetic field needs to interact with the rotor rotating magnetic field to generate torque, so that strong coupling exists between torque control and displacement control, the control is complex, an accurate mathematical model is difficult to establish, and the control precision is low. For a bearingless asynchronous motor, except that a rotor rotating magnetic field with the same number of pole pairs as that of a torque winding magnetic field can be induced in a rotor conducting bar by the torque winding magnetic field, a rotor rotating magnetic field with the same number of pole pairs as that of a suspension winding magnetic field can be induced in the rotor conducting bar by the suspension winding magnetic field, the rotating magnetic field has weakening effect on the generation of suspension force, the complexity of torque control and displacement control can be increased, the complexity is more obvious particularly when the motor runs with a load, the system is unstable and suspension fails when the motor runs with the load. In addition, a single bearingless motor can only restrain two degrees of freedom of a rotor in the radial direction generally, and 2 bearingless motors and one axial magnetic suspension bearing are needed for realizing stable suspension of the rotor, or one bearingless motor and one radial magnetic suspension bearing are needed. Therefore, the common bearingless motor is not only subjected to a plurality of restrictions on the control strategy, but also has a very complex structure. When the axial length of the rotor of the bearingless motor is smaller than the diameter of the rotor, the rotor is passively stable in the axial direction, only two radial degrees of freedom of the rotor need to be controlled for stable suspension, the special bearingless motor is called as a sheet bearingless motor, and becomes one of the hotspots in the research field of the current bearingless motor, and sheet bearingless permanent magnet motors with various structures are researched, and the existence of the rotor permanent magnet causes large magnetic circuit magnetic resistance, large power consumption, low mechanical strength of the rotor, and difficulty in realizing higher rotating speedAnd higher power operation. Therefore, the novel sheet bearingless asynchronous motor which is simple to control, has no coupling between the suspension force and the torque and can generate more effective suspension force is researched, and the novel sheet bearingless asynchronous motor has great significance for realizing the industrial application of the bearingless motor.
Disclosure of Invention
The invention provides a drug delivery deviceP B=P MThe +/-1 condition limits, only induces a rotating magnetic field with the same number of pole pairs as that of a torque winding magnetic field in the rotor, and the rotating magnetic field is passively suspended by bias magnetic flux in the axial direction and actively suspended in the radial direction, so that the control is simple, the suspension control and the torque control are independent, and the stator permanent magnet type outer rotor sheet-shaped bearingless asynchronous motor structure can generate larger radial suspension force.
The invention is realized by the following technical scheme:
a stator permanent magnet type outer rotor sheet bearing-free asynchronous motor comprises an outer rotor iron core and an inner stator of an inner ring of the outer rotor iron core, the inner stator comprises a stator iron core, an axial magnetized cylindrical permanent magnet and a disc-shaped iron core bridge which are connected into a whole, the stator iron core is laminated on the left end surface of the cylindrical permanent magnet, the iron core bridge is laminated on the right end surface of the cylindrical permanent magnet, the axes of the stator iron core, the iron core bridge and the cylindrical permanent magnet are collinear, a stator slot is arranged on the stator iron core, a torque winding and a suspension winding are arranged in the stator slot, the radial length of the outer rotor iron core is larger than the axial length of the outer rotor iron core, the inner surface of the outer rotor iron core is provided with a rotor groove, a rotor winding is wound in the rotor groove or a cage-shaped conducting bar is poured in the rotor groove, the right side of the outer rotor iron core body is provided with a circle of bosses extending towards the iron core bridge, and the bosses are aligned with the circumferential surface of the iron core bridge in the radial direction.
The invention has the further improvement scheme that the number of the rotor slots is even, the rotor winding or the conducting bars adopt a split-phase structure, and the number of the pole pairs of the split-phase structure is the same as that of the torque winding. The rotor winding cuts the torque winding magnetic field, and the generated rotor rotating magnetic field is the same as the pole pair number of the torque winding magnetic field; and the rotor rotating magnetic field is not induced in the rotor winding by the suspension winding magnetic field and the permanent magnet magnetic field.
The torque winding is positioned at the outer side of the suspension winding, the number of pole pairs of the suspension winding is different from that of the torque winding, and the suspension winding is supplied with power by a direct current power supply.
The invention has the further improvement scheme that the cylindrical permanent magnet is made of rare earth permanent magnet material.
In a further improvement of the invention, the stator core, the core bridge and the outer rotor core are all made of magnetic conductive materials.
The further improvement scheme of the invention is that the inner stator is provided with a radial displacement sensor which points to the outer rotor iron core vertically.
Compared with the prior art, the invention has the following obvious advantages:
the invention provides static bias magnetic flux for the motor by a cylindrical permanent magnet magnetized in the axial direction, the suspension winding is powered by a direct-current power supply and provides suspension control magnetic flux for the motor, the suspension control magnetic flux adjusts the static bias magnetic flux, radial suspension force is generated on an outer rotor, and the outer rotor is controlled to suspend stably in the radial direction; the outer rotor is made into a sheet shape, the radial length of the outer rotor is far greater than the axial thickness of the outer rotor, and the magnetic resistance force generated by the bias magnetic flux in the axial direction realizes passive suspension. Compared with a conventional bearingless asynchronous motor, the suspension control and the torque control are mutually independent, the number of rotor slots is even, a rotor winding or a conducting bar adopts a split-phase structure, the number of pole pairs of the rotor winding or the conducting bar is the same as that of the torque winding, the rotor winding or the conducting bar cuts a magnetic field of the torque winding to generate induction current, and a rotating magnetic field formed by the induction current is the same as that of the torque winding; and the suspension winding magnetic field and the permanent magnet magnetic field are generated in the rotor winding non-inductive rotating magnetic field. Therefore, the advantages of large radial suspension force, simple control and easy realization can be generated. Compared with a permanent magnet type sheet bearingless motor, the surface of the rotor is not provided with a permanent magnet, the magnetic resistance of a suspension control magnetic circuit is small, and the power consumption of suspension control is low; compared with a common five-degree-of-freedom bearingless motor, the five-degree-of-freedom bearingless 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 sheet bearing-free asynchronous motor with the structure can be widely applied to the high-speed direct drive fields of flywheel energy storage, various high-speed machine tool spindle motors, sealing pumps, centrifuges, compressors, high-speed small hard disk drive devices and the like.
Drawings
Fig. 1 is a schematic view of the front view structure and the magnetic circuit of the present invention.
Fig. 2 is a schematic diagram of the winding arrangement and radial magnetic circuit of the motor of the present invention.
Fig. 3 is a schematic wiring diagram of a wound rotor winding for a rotor slot of the present invention.
Fig. 4 is a schematic view of the connection of the casting cage-shaped conducting bars U in the rotor slot of the invention.
Fig. 5 is a schematic view of the connection of the casting cage type conducting bars V in the rotor slot of the present invention.
Fig. 6 is a schematic view of the connection of the cage-shaped conducting bars W poured into the rotor slots according to the present invention.
Detailed Description
As shown in fig. 1 to 6, a three-phase motor with 12 slots in the number of rotor slots, 1 pole pair of levitation winding, and 2 pole pair of torque winding will be described in detail as an example:
a stator permanent magnet type outer rotor sheet bearingless asynchronous motor comprises an outer rotor iron core 1 and an inner stator 2 arranged at the inner ring of the outer rotor iron core 1, wherein the inner stator 2 comprises a stator iron core 3, an axially magnetized cylindrical permanent magnet 4 and a disc-shaped iron core bridge 5 which are connected into a whole, the stator iron core 3 is laminated on the left end surface of the cylindrical permanent magnet 4, the iron core bridge 5 is laminated on the right end surface of the cylindrical permanent magnet 4, the axial lines of the stator iron core 3, the iron core bridge 5 and the cylindrical permanent magnet 4 are collinear, a stator slot is formed in the stator iron core 3, a torque winding 6 and a suspension winding 7 are arranged in the stator slot, the radial length of the outer rotor iron core 1 is greater than the axial length of the outer rotor iron core, the radial length of the outer rotor iron core is greater than the axial thickness of the outer rotor, when the axial line of the outer rotor iron core, and the axial passive suspension of the motor rotor is realized. The inner surface of the outer rotor iron core 1 is provided with a rotor groove, a rotor winding 8 is wound in the rotor groove or a cage-shaped conducting bar 9 is poured in the rotor groove, the right side of the body of the outer rotor iron core 1 is provided with a circle of bosses 10 extending towards the iron core bridge, and the bosses 10 are aligned with the circumferential surface of the iron core bridge 5 in the radial direction.
The number of the rotor slots is even, the rotor winding 8 or the cage-shaped conducting bars 9 adopt a split-phase structure, and the number of pole pairs of the rotor winding 8 or the cage-shaped conducting bars 9 is the same as that of the torque winding 6. The rotor winding cuts the torque winding magnetic field, and the generated rotor rotating magnetic field is the same as the pole pair number of the torque winding magnetic field; and the rotor rotating magnetic field is not induced in the rotor winding by the suspension winding magnetic field and the permanent magnet magnetic field.
The torque winding 6 is located on the outer side of the suspension winding 7, the number of pole pairs of the suspension winding 7 is different from the number of pole pairs of the torque winding 6, the suspension winding 7 is powered by a direct-current power supply and provides suspension control magnetic flux for a motor, the suspension control magnetic flux adjusts static bias magnetic flux to generate radial suspension force on the outer rotor, and the rotor is controlled to suspend stably in the radial direction.
The cylindrical permanent magnet 4 is made of rare earth permanent magnet material. The inner stator 2 is provided with a radial displacement sensor 11 which points to the outer rotor iron core vertically, the radial offset of the outer rotor is detected, a radial displacement closed-loop control system is constructed, and radial stable suspension is realized.
The cylindrical permanent magnet 4 provides static bias magnetic flux 12 for the motor, the N pole of the static bias magnetic flux 12 is adjacent to the iron core bridge, and the magnetic circuit of the static bias magnetic flux 12 is as follows: the magnetic flux starts from the N pole of the cylindrical permanent magnet 4 and returns to the S pole of the cylindrical permanent magnet through the iron core bridge 5, the air gap between the iron core bridge and the outer rotor iron core, the motor air gap and the stator iron core; the suspension winding is supplied with power by a direct current power supply and provides suspension control magnetic flux 13 for the motor, and the magnetic circuit is as follows: the upper side of the outer rotor iron core, the upper side motor air gap, the inner stator, the lower side motor air gap, the lower side of the outer rotor iron core and the stator yoke on the left side of the motor form a closed loop; the static bias magnetic flux 12 and the suspension control magnetic flux 13 interact to generate radial suspension force on the rotor; the axial direction is the axial levitation thereof achieved by the reluctance force of the static bias flux 12. The suspension winding and the torque winding are formed by winding electromagnetic coils with good electric conductivity and then dipping paint and drying.
The outer layer of the stator slot is a torque winding 6 which is the same as a common asynchronous arrangement motor; the suspension winding 7 is divided intoxA direction control winding andythe direction suspension control winding is arranged on the upper portion of the motor,xdirection control winding setDrawing coilL X1~L X12In series according to the direction of figure 2;ythe direction suspension control winding comprises a windingL Y1~L Y12They may be connected in series in the direction shown in FIG. 2.
The rotor winding arrangement is exemplified by the number of rotor slots 12, since the torque winding is 3-phase 4-pole, and the number of rotor winding phases and poles must be the same as the torque winding, the rotor winding is also divided into 3-phase 4-pole, i.e., slots
、
、
、
The windings in the transformer are short-circuited into one phase; trough
、
、
、
The windings in the transformer are short-circuited into one phase; trough
、
、
、
The windings in the transformer are short-circuited into one phase; according to the arrangement, when the motor runs, only the torque winding magnetic field in the windings among the suspension winding magnetic field, the torque winding magnetic field and the bias magnetic field generated by the permanent magnet can generate a rotor rotating magnetic field.
If the cage-shaped conducting bars are poured into the rotor slots, the arrangement mode takes the rotor slots and the conducting bar number 12 as an example, the conducting bars are insulated on the outer layer and are split into phases through the end connection part, and because the torque winding is 3-phase 4-pole, the phase number and the pole number of the rotor conducting bars must be the same as those of the torque winding, the conducting bars are also divided into 3-phase 4-pole, namely the conducting bars
、
、
、
Short-circuit is one phase; conducting bar
、
、
、
Short-circuit is one phase; conducting bar
、
、
、
Short-circuit is one phase; and three phases are insulated from each other. According to the arrangement, when the motor runs, only the torque winding magnetic field of the suspension winding magnetic field, the torque winding magnetic field and the bias magnetic field generated by the permanent magnet can generate a rotor rotating magnetic field in the rotor conducting bar.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (3)
1. The utility model provides a stator permanent magnetism formula outer rotor slice does not have bearing asynchronous machine, includes outer rotor iron core (1), inner stator (2) of outer rotor iron core (1) inner circle, characterized by: the inner stator (2) comprises a stator iron core (3), an axially magnetized cylindrical permanent magnet (4) and a disc-shaped iron core bridge (5) which are connected into a whole, the stator iron core (3) is laminated on the left end face of the cylindrical permanent magnet (4), the iron core bridge (5) is laminated on the right end face of the cylindrical permanent magnet (4), the axes of the stator iron core (3), the iron core bridge (5) and the cylindrical permanent magnet (4) are collinear, a stator slot is formed in the stator iron core (3), a torque winding (6) and a suspension winding (7) are arranged in the stator slot, the radial length of the outer rotor iron core (1) is larger than the axial thickness of the outer rotor iron core, a rotor slot is formed in the inner surface of the outer rotor iron core (1), a rotor winding (8) or a cage-shaped guide bar (9) is wound in the rotor slot, a circle of boss (10) extending towards the iron core bridge is arranged on the, the lug boss (10) is aligned with the peripheral surface of the iron core bridge (5) in the radial direction, and the columnar permanent magnet (4) is made of rare earth permanent magnet material; the number of the rotor slots is even, the rotor winding (8) or the cage-shaped conducting bar (9) adopts a split-phase structure, and the number of pole pairs of the rotor winding (8) or the cage-shaped conducting bar (9) is the same as that of the torque winding (6); the torque winding (6) is located on the outer side of the suspension winding (7), the number of pole pairs of the suspension winding (7) is different from the number of pole pairs of the torque winding (6), and the suspension winding (7) is powered by a direct-current power supply.
2. The stator permanent magnet type outer rotor sheet bearingless asynchronous motor according to claim 1, wherein: the stator iron core (3), the iron core bridge (5) and the outer rotor iron core (1) are all made of magnetic conductive materials.
3. The stator permanent magnet type outer rotor sheet bearingless asynchronous motor according to claim 1, wherein: and a radial displacement sensor (11) which points to the outer rotor iron core vertically is arranged on the inner stator (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810702241.9A CN108599500B (en) | 2018-06-30 | 2018-06-30 | Stator permanent magnet type outer rotor sheet bearingless asynchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810702241.9A CN108599500B (en) | 2018-06-30 | 2018-06-30 | Stator permanent magnet type outer rotor sheet bearingless asynchronous motor |
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| CN108599500A CN108599500A (en) | 2018-09-28 |
| CN108599500B true CN108599500B (en) | 2020-05-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109347226B (en) * | 2018-10-25 | 2020-09-25 | 江苏大学 | Bearingless permanent magnet sheet motor |
| CN113497504B (en) * | 2020-04-07 | 2023-03-14 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | Ground coil, stator and linear motor for magnetic suspension electromagnetic propulsion system |
| CN113182083B (en) * | 2021-04-25 | 2022-06-03 | 西南交通大学 | Based on electronic floated centrifuge of permanent magnetism |
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| US10177627B2 (en) * | 2015-08-06 | 2019-01-08 | Massachusetts Institute Of Technology | Homopolar, flux-biased hysteresis bearingless motor |
| 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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