CN109067024A - A kind of big torque micro-vibration magnetic suspension switched reluctance motor - Google Patents
A kind of big torque micro-vibration magnetic suspension switched reluctance motor Download PDFInfo
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- CN109067024A CN109067024A CN201810817739.XA CN201810817739A CN109067024A CN 109067024 A CN109067024 A CN 109067024A CN 201810817739 A CN201810817739 A CN 201810817739A CN 109067024 A CN109067024 A CN 109067024A
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- 239000000725 suspension Substances 0.000 title claims abstract description 36
- 238000004804 winding Methods 0.000 claims abstract description 24
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000004146 energy storage Methods 0.000 abstract description 5
- 230000005347 demagnetization Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 53
- 238000010586 diagram Methods 0.000 description 4
- 238000005339 levitation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 206010000234 Abortion spontaneous Diseases 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling 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
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 208000015994 miscarriage Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 208000000995 spontaneous abortion Diseases 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- 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
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- 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
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Synchronous Machinery (AREA)
Abstract
The invention discloses a kind of big torque micro-vibration magnetic suspension switched reluctance motors, including stator, first layer stator tooth pole, second layer stator tooth pole, first layer rotor tooth pole, second layer rotor tooth pole, rotor and shaft；The rule distribution that stator tooth pole winding is NNNSSS by the magnetic direction that winding current generates.4 pieces of permanent magnets are embedding in the stator, can significantly increase torque and suspending power, while convenient for the temperature rise of control permanent magnet, reducing demagnetization risk；Stator and rotor all use double-deck helical teeth pole structure, can be substantially reduced motor oscillating, are advantageously implemented the stable suspersion of rotor, and reduce vibrating noise.Motor of the invention is simple with structure, rotor is firm, have many advantages, such as high speed, big torque, low noise, micro-vibration, high efficiency, high power density and high reliability, theoretical and practical values are high, suitable for bad environments such as turbomolecular pump, high-speed machine tool, flywheel energy storage and aerospaces, and require the field of high-precision, high reliability.
Description
Technical field
The present invention relates to a kind of big torque micro-vibration magnetic suspension switched reluctance motor, there is big torque, low noise, with small vibration
The features such as, it can be used for high speed, high efficiency, high reliability occasion, be particularly suitable for Energy Storage of Flywheel Battery field.
Background technique
Switched reluctance machines due to its double-salient-pole structure simple rigid the advantages of and bad working environments under good operation
Characteristic causes the extensive concern of educational circles and industry.With the development of the times, switched reluctance machines are in turbomolecular pump, high speed
The fields such as lathe, flywheel energy storage, aerospace increasingly have important application value, this is allowed for by conventional mechanical bearings branch
The mechanical wear of the high speed or super high speed motor held, loss increase severely and become increasingly conspicuous the problems such as fever, seriously affect motor use
Service life increases maintenance cost.
The rational method for solving problem above is exactly to pass through electromagnetic force suspension rotor, and then magnetic suspension switched reluctance motor is answered
It transports and gives birth to.The advantages of magnetic suspension switched reluctance motor is developed at the end of the 20th century, has both magnetic bearing and switched reluctance machines, can
Maximally utilise reluctance torque.The salient pole type rotor magnetic suspension switched reluctance motor tool of A.Chiba of Japan et al. design
There are the advantages such as simple, easy to maintain, the easy realization high speed of structure or ultrahigh speed operation.But conventional maglev switched reluctance machines
Torque, efficiency, in terms of opposite magneto is lower and its operation when vibration is big, noise is big problem, system
About its development and application in numerous areas.
A kind of simplex winding magnetic levitation switch magnetic is disclosed in the document that Chinese Patent Application No. is CN201320829637.2
Motor is hindered, compensates for traditional double winding magnetic suspension switched reluctance motor because there is strong between its torque winding and suspending windings
Coupling, caused by difficult defect is decoupled on control strategy and mathematical model.But there is also magnetic levitation switch magnetic resistance electricity
Machine is relatively low with respect to magneto torque and it vibrates problem big, that noise is big.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention provides a kind of big torque micro-vibration magnetic levitation switch magnetic resistance
Motor by injecting permanent magnet in the stator of magnetic suspension switched reluctance motor, and uses double layered stator and rotor helical teeth pole,
A kind of big torque micro-vibration magnetic suspension switched reluctance motor formed has high speed, big torque, high reliability, high efficiency, Gao Gong
The characteristics of rate density, micro-vibration, low noise, has further widened the application range of magnetic suspension switched reluctance motor.
Technical scheme is as follows:
A kind of big torque micro-vibration magnetic suspension switched reluctance motor, including stator, first layer stator tooth pole, second layer stator
Tooth pole, first layer rotor tooth pole, second layer rotor tooth pole, rotor and shaft；It is fixedly installed on the inner peripheral surface of the stator
Two layers of 24 tooth pole altogether, wherein 12 tooth poles form first layer stator tooth pole, in addition 12 tooth poles form second layer stator tooth
Pole；Two layers of 16 tooth pole altogether is fixedly installed on the outer circumference surface of the rotor, wherein 8 tooth poles form first layer rotor tooth
Pole, in addition 8 tooth poles form second layer rotor tooth pole；The institute of the stator it is with teeth extremely on wind winding, winding is by winding electricity
The rule distribution that the raw magnetic direction of miscarriage is NNNSSS.
Further, big torque micro-vibration magnetic suspension switched reluctance motor of the invention further includes permanent magnet, described in 4
Permanent magnet is located between B phase second layer stator tooth pole and C phase first layer stator tooth pole, and is uniformly distributed apart from one another by 90 degree；Phase
Adjacent permanent magnet homopolarity is oppositely arranged.
Further, the axial length of the permanent magnet and the axial length of stator are consistent；The permanent magnet it is radially-wide
Degree is less than the radial width of stator.
Further, the material of the permanent magnet is ferrite or neodymium iron boron.
Further, the stator and rotor all have the double-deck helical teeth pole.
Further, every layer of tooth pole of the stator and rotor is all made of identical drift angle, and first layer stator tooth pole and
There is no angle of displacement between the stator tooth pole of the second layer, there is no angle of displacement between first layer rotor tooth pole and second layer rotor tooth pole,
When so that first layer rotor tooth pole and first layer stator tooth pole be in aligned position, upper and lower corresponding second layer rotor tooth pole and
Second layer stator tooth pole is also at aligned position.
Further, the permanent magnet is inclined to set, and drift angle is identical as the drift angle of tooth pole.
The present invention has the beneficial effect that afterwards by adopting the above technical scheme
Big torque micro-vibration magnetic suspension switched reluctance motor of the invention is with structure is simple, rotor is firm, power density
The advantages that high, high-efficient, can be used for flywheel energy storage, various high-speed machine tool spindle motors and canned pump class, centrifuge, compressor,
The fields such as high-speed micro hard disk drive.
1. it is good to remain compact-sized simplex winding magnetic suspension switched reluctance motor, error resilience performance and robust performance in structure
Advantage；
2. to remain in performance in stator injection permanent magnet, magneto torque is big, loss is small, power density is big, effect
The high advantage of rate, and convenient for control permanent magnet temperature rise, it is not easy to demagnetize, increases service life；
3. constructing double-deck helical teeth pole in stator and rotor, lacked so that the vibration of switched reluctance machines inherently is big, noise is big
It falls into and is made up, improve the Stability and dependability of system operation；The shape of two layers of tooth pole is identical, and non-displacement angle, manufacture
Difficulty and single layer helical teeth are extremely consistent, but the ability of vibration and noise is inhibited greatly to be better than single layer helical teeth pole.
Detailed description of the invention
Fig. 1 is a kind of big torque micro-vibration magnetic suspension switched reluctance motor radial direction subdivision graph.
Fig. 2 is a kind of big torque micro-vibration magnetic suspension switched reluctance motor axial subdivision figure.
Fig. 3 is that a kind of winding of big torque micro-vibration magnetic suspension switched reluctance motor is electrically connected schematic diagram.
Fig. 4 is a kind of big torque micro-vibration magnetic suspension switched reluctance motor stationary part radial direction subdivision schematic diagram.
Fig. 5 is a kind of big torque micro-vibration magnetic suspension switched reluctance motor rotor schematic diagram.
In figure: 1. stators；2. permanent magnet；3. first layer stator tooth pole；4. second layer stator tooth pole；5. first layer rotor tooth
Pole；6. second layer rotor tooth pole；7. rotor；8. shaft；9. coil windings；10. photoelectric encoder；11. current vortex sensor；
12. casing；13. self-aligning ball bearing；14. auxiliary bearing；15. internal screw thread cooling tube；16. left end cap；17. right end cap.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.
As shown in Figure 1, a kind of radial subdivision graph of big torque micro-vibration magnetic suspension switched reluctance motor of the present invention, including it is fixed
Son 1, permanent magnet 2, first layer stator tooth pole 3, second layer stator tooth pole 4, first layer rotor tooth pole 5, second layer rotor tooth pole 6,
Rotor 7 and shaft 8.Two layers of 24 tooth pole altogether is fixed on the inner peripheral surface of stator 1, wherein 12 tooth pole composition first layers are fixed
Sub- tooth pole 3, in addition 12 tooth poles form second layer stator tooth pole 4；Two layers of 16 tooth altogether is fixed on the outer circumference surface of rotor 7
Pole, wherein 8 tooth poles form first layer rotor tooth pole 5, and in addition 8 tooth poles form second layer rotor tooth pole 6；4 permanent magnets 2
Between B phase second layer stator tooth pole 4 and C phase first layer stator tooth pole 3, the axial length one of axial length and stator 1
It causes and is uniformly distributed apart from one another by 90 degree；Permanent magnet 2 injects in stator 1, does not separate stator 1, the i.e. radial direction of permanent magnet 2 completely
Width is less than the radial width of stator 1；Adjacent two of 4 permanent magnets 2, the magnetic pole of identical polar is opposite；Permanent magnet 2 and stator
1 is identical with the drift angle of rotor 7.Magnetic field of permanent magnet is superimposed with electrical excitation field, so that air-gap induction increases, to increase torque
And suspending power.
As shown in Fig. 2, a kind of big torque micro-vibration magnetic suspension switched reluctance motor axial subdivision figure of the present invention, stator inner wall
There is air gap between rotor outer wall, power grade, selected permanent-magnet material and the stator 1 of the thickness of air gap and motor,
The processing of rotor 7 is related with assembly technology.Casing 12 is used for fixed stator 1, left end cap 16 and right end cap 17, and left end cap 16 is for solid
It sets the tone heart ball bearing 13, right end cap 17 is for fixing auxiliary bearing 14.Self-aligning ball bearing 13 makes machine shaft one end axially solid
It is fixed, and the flexible motion in radial two degrees of freedom, auxiliary bearing 14 be for avoid motor suspend or quiescing process in caused by
Collision.Photoelectric encoder 10 and current vortex sensor 11 be separately mounted to shaft 8 left and right ends be used to detect motor speed and
Radial displacement.
As shown in figure 3, a kind of winding of big torque micro-vibration magnetic suspension switched reluctance motor of the present invention is electrically connected signal
Scheme, has first layer stator tooth pole 3 and two layers of second layer stator tooth pole 4 tooth pole on stator 1, share 24 stator poles, each stator
Extremely upper only a set of winding, the rule distribution that winding is NNNSSS by the magnetic direction that winding current generates reach inside motor
The best branch's effect in magnetic field.4 interval 90 ° windings constitute a phase, share A, B, C three-phase, wherein A phase winding by A1, A2,
A3, A4 coil composition, B phase winding are made of B1, B2, B3, B4 coil, and C phase winding is made of C1, C2, C3, C4 coil.This 24
A coil is respectively wrapped in a stator poles, and according to A1 → B1 → C1 → A2 → B2 → C2 → A3 → B3 → C3 → A4 → B4 →
The sequence of C4 coil is successively distributed on corresponding stator in the counterclockwise direction.
As shown in figure 4, a kind of big torque micro-vibration magnetic suspension switched reluctance motor stationary part radial direction subdivision of the present invention shows
It is intended to, stator 1 has double-deck helical teeth pole.Totally 24 tooth poles all use phase for first layer stator tooth pole 3 and the stator tooth pole 4 of the second layer
Same drift angle, and there is no angle of displacement between first layer stator tooth pole 3 and the stator tooth pole 4 of the second layer.
As shown in figure 5, a kind of big torque micro-vibration magnetic suspension switched reluctance motor rotor portion schematic diagram of the present invention, rotor
7 have double-deck helical teeth pole.Totally 16 tooth poles all use identical drift angle for first layer rotor tooth pole 5 and second layer rotor tooth pole 6, the
There is no angle of displacement between one layer of rotor tooth pole 5 and the rotor tooth pole 6 of the second layer, so that first layer rotor tooth pole 5 and first layer are fixed
When sub- tooth pole 3 is in aligned position, upper and lower corresponding second layer rotor tooth pole 6 is also at second layer stator tooth pole 4 to be aligned
Position, i.e. in a phase up and down four groups of stator tooth poles and rotor tooth pole all in aligned position.Vibration and noise main source are fixed
Nearby torque force radial component changes rapidly son with rotor interpolar air gap, since it changes most in the stator yoke near rotor pole
Fierceness, therefore can reduce its suddenly change by tilting stator and rotor tooth pole, it is entire fixed to be more distributed in
On son, its peak value is reduced, to realize inhibition vibration, reduces noise.
In conclusion the present invention is the one kind designed based on 12/8 traditional simplex winding magnetic suspension switched reluctance motor
Big torque micro-vibration magnetic suspension switched reluctance motor, is made of stator, permanent magnet and rotor.Wherein 4 pieces of permanent magnets are embedded in stator
In, torque and suspending power can be significantly increased, while convenient for the temperature rise of control permanent magnet, reducing demagnetization risk；Stator and rotor are all
Using double-deck helical teeth pole structure, it can be substantially reduced motor oscillating, be advantageously implemented the stable suspersion of rotor, and reduce vibration and make an uproar
Sound.The present invention is that a kind of structure is simple, rotor is firm, has high speed, big torque, low noise, micro-vibration, high efficiency, high power
The magnetic suspension switched reluctance motor of density and high reliability, have very high theoretical and practical values, be suitable for turbomolecular pump,
The bad environments such as high-speed machine tool, flywheel energy storage and aerospace, and require the field of high-precision, high reliability.
According to the above, the present invention can be realized.To those skilled in the art without departing substantially from spirit of the invention
Other changes and modifications with making in the case where protection scope, are included within the scope of the present invention.
Claims (7)
1. a kind of big torque micro-vibration magnetic suspension switched reluctance motor, which is characterized in that including stator (1), first layer stator tooth
Pole (3), second layer stator tooth pole (4), first layer rotor tooth pole (5), second layer rotor tooth pole (6), rotor (7) and shaft (8)；
Two layers of 24 tooth pole altogether is fixedly installed on the inner peripheral surface of the stator (1), wherein 12 tooth poles form first layer stator
Tooth pole (3), in addition 12 tooth poles form second layer stator tooth pole (4)；Two are fixedly installed on the outer circumference surface of the rotor (7)
Layer has 16 tooth poles altogether, wherein 8 tooth pole compositions first layer rotor tooth pole (5), in addition 8 tooth poles form second layer rotor tooth pole
(6)；The institute of the stator (1) it is with teeth extremely on wind winding, winding is NNNSSS's by the magnetic direction that winding current generates
Rule distribution.
2. a kind of big torque micro-vibration magnetic suspension switched reluctance motor according to claim 1, which is characterized in that further include
Permanent magnet (2), permanent magnet (2) described in 4 be located at the phase second layer stator tooth pole B (4) and the phase first layer stator tooth pole C (3) it
Between, and be uniformly distributed apart from one another by 90 degree；Adjacent permanent magnet (2) homopolarity is oppositely arranged.
3. a kind of big torque micro-vibration magnetic suspension switched reluctance motor according to claim 2, which is characterized in that it is described forever
The axial length of magnet (2) is consistent with the axial length of stator (1)；The radial width of the permanent magnet (2) is less than stator (1)
Radial width.
4. a kind of big torque micro-vibration magnetic suspension switched reluctance motor according to claim 2 or 3, which is characterized in that institute
The material for stating permanent magnet (2) is ferrite or neodymium iron boron.
5. a kind of big torque micro-vibration magnetic suspension switched reluctance motor according to claim 1, which is characterized in that the stator
(1) the double-deck helical teeth pole is all had with rotor (7).
6. a kind of big torque micro-vibration magnetic suspension switched reluctance motor according to claim 5, which is characterized in that the stator
(1) and every layer of tooth pole of rotor (7) is all made of identical drift angle, and the stator tooth pole of first layer stator tooth pole (3) and the second layer
(4) there is no angle of displacement between, there is no angle of displacement between first layer rotor tooth pole (5) and second layer rotor tooth pole (6), so that first
When layer rotor tooth pole (5) and first layer stator tooth pole (3) are in aligned position, upper and lower corresponding second layer rotor tooth pole (6)
Aligned position is also at second layer stator tooth pole (4).
7. a kind of big torque micro-vibration magnetic suspension switched reluctance motor according to claim 6, which is characterized in that the permanent magnetism
Body (2) is inclined to set, and drift angle is identical as the drift angle of tooth pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810817739.XA CN109067024B (en) | 2018-07-24 | 2018-07-24 | Large-torque micro-vibration magnetic suspension switched reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810817739.XA CN109067024B (en) | 2018-07-24 | 2018-07-24 | Large-torque micro-vibration magnetic suspension switched reluctance motor |
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| Publication Number | Publication Date |
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| CN109067024A true CN109067024A (en) | 2018-12-21 |
| CN109067024B CN109067024B (en) | 2021-02-12 |
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| CN201810817739.XA Active CN109067024B (en) | 2018-07-24 | 2018-07-24 | Large-torque micro-vibration magnetic suspension switched reluctance motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829723A (en) * | 2019-10-25 | 2020-02-21 | 上海品星防爆电机有限公司 | Motor internal circulation heat dissipation method and structure thereof |
| WO2020220857A1 (en) * | 2019-04-29 | 2020-11-05 | 苏州苏磁智能科技有限公司 | High-efficiency magnetic coupling and levitation pump |
| CN112994279A (en) * | 2021-02-19 | 2021-06-18 | 杭州星成电气科技有限公司 | Stator and rotor of switched reluctance motor |
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| GB2497667A (en) * | 2011-12-16 | 2013-06-19 | Samsung Electro Mech | A switch reluctance machine having a rotor acting as a fluid impeller |
| CN103647359A (en) * | 2013-12-13 | 2014-03-19 | 江苏大学 | Magnetic suspension switch magnetic resistance motor |
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| CN205647062U (en) * | 2016-05-30 | 2016-10-12 | 上海鼎特电器有限公司 | Motor core's structure |
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| GB2497667A (en) * | 2011-12-16 | 2013-06-19 | Samsung Electro Mech | A switch reluctance machine having a rotor acting as a fluid impeller |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020220857A1 (en) * | 2019-04-29 | 2020-11-05 | 苏州苏磁智能科技有限公司 | High-efficiency magnetic coupling and levitation pump |
| CN110829723A (en) * | 2019-10-25 | 2020-02-21 | 上海品星防爆电机有限公司 | Motor internal circulation heat dissipation method and structure thereof |
| CN112994279A (en) * | 2021-02-19 | 2021-06-18 | 杭州星成电气科技有限公司 | Stator and rotor of switched reluctance motor |
| CN112994279B (en) * | 2021-02-19 | 2022-02-11 | 杭州星成电气科技有限公司 | Switched reluctance motor |
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| Publication number | Publication date |
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| CN109067024B (en) | 2021-02-12 |
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