CN111682667A - 48/8 bearingless alternating pole permanent magnet synchronous motor - Google Patents
48/8 bearingless alternating pole permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN111682667A CN111682667A CN202010454797.8A CN202010454797A CN111682667A CN 111682667 A CN111682667 A CN 111682667A CN 202010454797 A CN202010454797 A CN 202010454797A CN 111682667 A CN111682667 A CN 111682667A
- Authority
- CN
- China
- Prior art keywords
- winding
- suspension
- pole
- phase
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
-
- 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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- 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
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- 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
- H02K3/28—Layout of windings or of connections between windings
-
- 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 48/8 bearingless alternating-pole permanent magnet synchronous motor, which belongs to the technical field of magnetic suspension motors and comprises a stator core, a rotor core, permanent magnets, a three-phase torque winding and a suspension winding. The permanent magnets are arranged in the same polarity, and the iron core between the permanent magnets of the rotor is magnetized to have the opposite polarity to the permanent magnets. Two sets of windings on the stator core provide torque magnetic field and suspension magnetic field respectively. On the basis of deep analysis of motor suspension excitation, a sine winding method is provided for a suspension winding structure, when the motor simultaneously realizes torque and suspension functions, the suspension force performance is improved, and the coupling degree of the suspension force in the x and y directions is reduced. Compared with other methods for improving the suspension force by adding an auxiliary structure, the method has the advantages that the structure of the motor is simpler, and the loss is smaller.
Description
Technical Field
The invention relates to a bearingless alternating pole permanent magnet synchronous motor which is suitable for high-speed and high-power motor application occasions. Belongs to the field of magnetic suspension motors applying a bearingless technology.
Background
An alternating pole permanent magnet synchronous machine was first proposed in the US patent US 4631435P and was further improved in about 2000. The permanent magnets of the motor are arranged in the same polarity, and the adjacent rotor iron cores are magnetized to have the other polarity, which is also called as an iron pole. The motor can flexibly adjust the magnetic flux below the iron poles so as to achieve the aim of adjusting the air gap magnetic field. Researches show that the permanent magnet of the motor is more economical in use amount. In recent years, the alternating pole structure is applied to various types of permanent magnet motors due to the advantages of small permanent magnet usage amount, easy field weakening and the like.
The bearingless motor integrates the suspension magnetic bearing winding on the motor stator, and has the advantages of high efficiency, maintenance-free property, long service life, low requirement on the operating environment and the like. The bearingless permanent magnet motor with the alternating pole structure can ensure that the suspension force is independent of the position angle of the rotor when the number p of pole pairs of the motor is more than or equal to 4, and the compromise of the thickness of the permanent magnet on the torque and the suspension performance is not required to be considered. However, the distribution of the air gap field of the alternating pole bearingless permanent magnet synchronous motor is more complicated than that of the traditional bearingless permanent magnet synchronous motor, the fluctuation of the suspension force of the motor is larger, and the suspension forces in the x direction and the y direction are coupled greatly.
Aiming at the problem of the suspension force performance of the alternating pole bearingless permanent magnet synchronous motor, a plurality of researchers provide different improvement methods. Researchers have compared the influence of concentrated windings and distributed windings, and two-phase windings and three-phase windings on the suspension performance of the motor. Researchers also propose methods for adding an auxiliary pole or an auxiliary winding in the literature, and the methods are considered to achieve better levitation effect and decoupling effect of levitation force in the x direction and the y direction compared with the traditional winding structure. However, both methods make the structure of the motor more complicated and the loss is larger.
Disclosure of Invention
The invention designs a three-phase 48-slot 8-pole alternating pole bearingless permanent magnet synchronous motor aiming at the application of the bearingless alternating pole permanent magnet synchronous motor in high rotating speed and low loss occasions, in particular to the problems in the aspect of suspension force performance.
In order to achieve the purpose, the technical scheme of the invention is as follows: the motor comprises a stator core, a rotor core, a permanent magnet, a three-phase torque winding and a suspension winding. The permanent magnets in the rotor can adopt an interpolation type or a built-in type, the magnetization directions of the permanent magnets are arranged along the surface of the rotor in the same polarity, and the iron core parts adjacent to the permanent magnets are magnetized to have opposite polarities, so that the permanent magnets are called as 'iron poles'. Since the core permeance is much larger than the permanent magnet permeance, the magnetic flux linkage generated by the winding is almost entirely hinged from the core. Stator core 48 slots, skewed slot design. The three-phase torque winding is designed as a common permanent magnet synchronous motor.
The motor suspension force is analyzed, the suspension force does not relate to the rotor position angle when the pole pair number meets a certain condition, but actually the suspension force regularly fluctuates along with the rotor position in each suspension force period, and coupling exists in the x direction and the y direction. In view of the above problems, a new suspension winding allocation method is proposed herein: in one suspension degree of freedom, the suspension winding adopts a sine winding with a concentric structure, and the number of conductors in each slot of the same phase winding is calculated and distributed according to a sine rule, so that the current distribution of the slots approximately conforms to a sine waveform, higher harmonics in a suspension air gap magnetic field are weakened, and the generated suspension magnetomotive force is close to the sine waveform.
Compared with the prior art, the invention has the beneficial effects that:
1. the motor designed by the invention can effectively reduce the fluctuation of the suspension force of the motor, reduce the coupling of the suspension force in the x and y directions, and has relatively less structural change and less loss on the structure of the existing motor.
2. The suspension winding designed in a sine mode can reduce the harmonic of the suspension magnetomotive force under the condition of not changing the total suspension current, and the suspension performance of the motor is improved. Meanwhile, the end part of the motor suspension winding is small, and the loss is small.
Drawings
FIG. 1 is a block diagram of an 48/8 bearingless consequent pole permanent magnet synchronous motor of the present invention;
FIG. 2 is a schematic diagram of the operation of the designed alternating pole permanent magnet synchronous motor;
FIG. 3 is a winding development of a phase levitation winding;
fig. 4 is a comparison of air gap flux densities of a designed sinusoidal winding and a conventional concentrated winding at a pole.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, it should be noted that the technical solutions and design principles of the present invention are described in detail below only with one optimized technical solution, but the scope of the present invention is not limited thereto.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
An 48/8 alternative pole bearingless permanent magnet synchronous motor of the invention is shown in fig. 1 and fig. 2, and comprises a stator core, a rotor core, a permanent magnet, a torque winding and a suspension winding. Wherein:
48 slots of the stator core are designed into inclined slots, and the angle of each inclined slot is 30 degrees. The motor adopts a double-winding structure, and the torque winding and the suspension winding are wound in the same stator slot. The design and the winding method of the torque winding are the same as those of the traditional permanent magnet synchronous motor.
The permanent magnets are in an interpolation type and arranged in the same polarity and are fixed in the rotor core. In order to adapt to high-speed operation, carbon fiber protective sleeves are required to be added outside the permanent magnet and the rotor core. The 4 permanent magnets are arranged in the same polarity, and a rotor core between the adjacent permanent magnets is magnetized to have the opposite polarity to the permanent magnets to form an 8-pole magnetic field. Since the core permeance is much larger than the permanent magnet permeance, the magnetic flux linkage generated by the winding is almost entirely hinged from the core.
The suspension winding group is designed into a sine winding, the distribution of the number of turns of the suspension winding is calculated according to the pole pitch and the total number of turns of the suspension winding, and the suspension winding is wound in a concentric mode. In the specific example of the invention, taking y-axis direction suspension as an example, the number of pole pairs of the three-phase 48-slot 8-pole motor suspension winding is 1, the pole pitch τ is 24, and the slot pitch angle α is adopted. The three-phase suspension windings A, B, C are arranged at intervals of 120 degrees, the three-phase suspension windings are designed according to a three-phase 60-degree phase belt, the winding belongs to the sequence of A → C → B → A → C → B, and a concentric structure type with an odd coil span is adopted. Taking phase A as an example, calculating according to a design method of a three-phase sinusoidal winding:
Σ＝0.831+0.752+0.659+0.556＝2.798 (2)
setting the total number of turns of the phase winding as N, and the distribution proportion of the number of turns of the coil as follows:
the number of coil turns for slots 5-28 is:
the number of turns of the coils of slots 6-27 is:
the number of coil turns for slots 7-26 is:
the number of coil turns for slots 8-25 is:
if the span between 8-25 slots is considered to be relatively small, it can also be allocated in 3 groups of coils:
Σ＝0.831+0.752+0.659＝2.242 (7)
grooves 5 to 28:
grooves 6 to 27:
grooves 7 to 26:
B. the calculation of the distribution of the number of turns of the C-phase winding is similar to that of the A-phase winding, and the specific distribution of the number of turns of the three-phase winding can be finely adjusted according to actual requirements and manufacturing convenience. The current required by the suspension force in the x direction and the y direction is converted into three-phase current according to the formula (11) and is introduced into the designed winding, wherein the development diagram of one phase of the suspension winding is shown in figure 3.
Wherein iA、iB、iCFor three-phase levitation winding current, ix、iyThe current is needed by the suspension force in the directions of the x axis and the y axis.
The magnetomotive force higher harmonic generated by the suspension winding with the improved structure is reduced and is closer to sinusoidal distribution; as can be seen from FIG. 4, comparing the air gap flux density of the improved levitation winding with that of the prior art, the air gap flux density obtained by the magnetic levitation sinusoidal winding method is more sinusoidal.
Compared with the suspension force generated in one electric period, the suspension force fluctuation generated by the suspension winding sine winding method is obviously improved compared with a concentrated winding, and is also superior to a three-phase distributed winding. The suspension force coupling degree in the x and y directions is reduced. Therefore, the sine winding mode is applied to the suspension winding, so that the suspension magnetomotive force harmonic wave is reduced under the condition that the total suspension current is not changed, and the suspension performance of the motor is improved. Meanwhile, the end part of the motor suspension winding is relatively small, and the loss is low.
The above-listed series of detailed descriptions are merely specific illustrations of possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent means or modifications that do not depart from the technical spirit of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. An 48/8 bearingless, alternating pole, permanent magnet synchronous machine comprising: the permanent magnet synchronous motor comprises a stator iron core (1), a rotor iron core (2) and permanent magnets (3), wherein the stator iron core (1) comprises two sets of windings, namely a torque winding (4) and a suspension winding (5), the permanent magnets (3) are fixed in the rotor iron core (2) and arranged in the same polarity, and the rotor iron core between the adjacent permanent magnets can be magnetized to be opposite to the polarity of the permanent magnets.
2. An 48/8 Bearingless altemating pole permanent magnet synchronous machine according to claim 1, characterized in that the stator core (1) comprises 48 slots, with a skewed slot design with a skewed slot angle of 30 °, a double winding configuration, i.e. two sets of torque winding (4) and levitation winding (5) are co-wound in one stator slot.
3. An 48/8 Bearingless Alternativemachine according to claim 1, wherein the permanent magnets (3) are of the "built-in" type, 4 permanent magnets (3) are arranged with the same polarity, the rotor core (2) between adjacent permanent magnets is magnetized with the opposite polarity to the permanent magnets to form an 8-pole magnetic field, and the magnetic flux linkage generated by the winding is almost completely hinged from the core.
4. 48/8 Bearingless altemating pole permanent magnet synchronous machine according to claim 1, characterized in that the permanent magnet (3) is externally provided with a carbon fiber protective sleeve.
5. An 48/8 Bearingless consequent pole PMSM according to claim 1, wherein the levitation winding (5) is sine wound, concentrically wound with a distribution of levitation winding turns calculated from levitation winding pole pitch and total number of turns.
6. An 48/8 Bearingless Alternatives pole permanent magnet synchronous machine according to claim 5, wherein the levitation winding is designed as follows when levitated in the y-axis direction:
the pole pair number of the three-phase 48-slot 8-pole motor suspension winding is 1, the pole distance tau is 24, the slot pitch angle alpha is A, B, C, the three-phase suspension winding is designed according to a three-phase 60-degree phase zone, a concentric structure with odd coil span is adopted, an A phase is taken as an example, and the winding turn number distribution is calculated according to the design method of a three-phase sine winding:
Σ＝0.831+0.752+0.659+0.556＝2.798(2)
and if the total number of turns of the phase winding is N, the distribution proportion of the number of turns of each coil is as follows:
grooves 5 to 28:
grooves 6 to 27:
grooves 7 to 26:
grooves 8 to 25:
7. an 48/8 bearingless, alternating pole, permanent magnet synchronous machine according to claim 6, further comprising: the coil allocation can also be as follows for 3 groups of coils:
Σ＝0.831+0.752+0.659＝2.242 (7)
grooves 5 to 28:
grooves 6 to 27:
grooves 7 to 26:
B. the calculation of the winding turn distribution of the phase C is similar to that of the phase A.
8. An 48/8 Bearingless Alternatives pole PMSM according to claim 6 or 7, wherein the levitation winding is designed to levitate equally as in the y-axis direction when levitated in the x-axis direction.
9. An 48/8 bearingless consequent pole permanent magnet synchronous machine, according to claim 8, wherein the currents required for the levitation forces in x and y directions are converted into three-phase currents to be conducted to the designed windings according to the following formula (11):
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454797.8A CN111682667A (en) | 2020-05-26 | 2020-05-26 | 48/8 bearingless alternating pole permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454797.8A CN111682667A (en) | 2020-05-26 | 2020-05-26 | 48/8 bearingless alternating pole permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111682667A true CN111682667A (en) | 2020-09-18 |
Family
ID=72453281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010454797.8A Pending CN111682667A (en) | 2020-05-26 | 2020-05-26 | 48/8 bearingless alternating pole permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111682667A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489178A (en) * | 2021-07-12 | 2021-10-08 | 南京航空航天大学 | Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1697288A (en) * | 2005-05-27 | 2005-11-16 | 南京航空航天大学 | Consequent pole lamellate electric motor with no bearing |
| CN1747281A (en) * | 2005-08-19 | 2006-03-15 | 南京航空航天大学 | Sheet permanent-magnetic electric machine with bearing and its control |
| CN102480175A (en) * | 2010-11-23 | 2012-05-30 | 大连创达技术交易市场有限公司 | Bearingless levitation rotor permanent magnet motor |
| CN105958761A (en) * | 2016-05-30 | 2016-09-21 | 上海电机系统节能工程技术研究中心有限公司 | Double-layer concentric unequal-turn winding design calculation method |
| CN106300752A (en) * | 2016-09-08 | 2017-01-04 | 广东工业大学 | A kind of the copper factor three-phase double-layer overlapped method around sine windings such as determine |
| CN106787310A (en) * | 2016-11-17 | 2017-05-31 | 南京航空航天大学 | A kind of magnetic-field-enhanced Consequent pole permanent magnet motor |
| CN110518724A (en) * | 2019-07-23 | 2019-11-29 | 南京航空航天大学 | Stator permanent magnetic type non-bearing flake motor and its working method |
-
2020
- 2020-05-26 CN CN202010454797.8A patent/CN111682667A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1697288A (en) * | 2005-05-27 | 2005-11-16 | 南京航空航天大学 | Consequent pole lamellate electric motor with no bearing |
| CN1747281A (en) * | 2005-08-19 | 2006-03-15 | 南京航空航天大学 | Sheet permanent-magnetic electric machine with bearing and its control |
| CN102480175A (en) * | 2010-11-23 | 2012-05-30 | 大连创达技术交易市场有限公司 | Bearingless levitation rotor permanent magnet motor |
| CN105958761A (en) * | 2016-05-30 | 2016-09-21 | 上海电机系统节能工程技术研究中心有限公司 | Double-layer concentric unequal-turn winding design calculation method |
| CN106300752A (en) * | 2016-09-08 | 2017-01-04 | 广东工业大学 | A kind of the copper factor three-phase double-layer overlapped method around sine windings such as determine |
| CN106787310A (en) * | 2016-11-17 | 2017-05-31 | 南京航空航天大学 | A kind of magnetic-field-enhanced Consequent pole permanent magnet motor |
| CN110518724A (en) * | 2019-07-23 | 2019-11-29 | 南京航空航天大学 | Stator permanent magnetic type non-bearing flake motor and its working method |
Non-Patent Citations (2)
| Title |
|---|
| 张乃标: ""交流电机三相正弦绕组及其应用"", 《高师理学刊》 * |
| 郭庆鼎: "《现代永磁电动机交流伺服系统》", 31 August 2006, 中国电力出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489178A (en) * | 2021-07-12 | 2021-10-08 | 南京航空航天大学 | Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor |
| CN113489178B (en) * | 2021-07-12 | 2022-04-15 | 南京航空航天大学 | Wide-area-running alternating pole type permanent magnet auxiliary synchronous reluctance motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2418756B1 (en) | Permanent magnet rotating electric machine | |
| CN104882978B (en) | A kind of low torque ripple high efficiency permanent magnet motor stator and rotor structure | |
| CN105846624A (en) | Double stator bearingless magnetic flux switching permanent magnetic motor | |
| CN109560675A (en) | Hybrid excitation permanent magnet motor based on three-stage stator shaft orientation complementary structure | |
| CN112953045A (en) | Radial strong-interference-resistance magnetic suspension switched reluctance motor | |
| CN110752728A (en) | L-shaped double-layer Halbach magnetic flux switching permanent magnet motor | |
| CN111682667A (en) | 48/8 bearingless alternating pole permanent magnet synchronous motor | |
| CN111555492B (en) | Parallel-magnetizing small-rare-earth-combination local Halbach array high-speed permanent magnet motor | |
| CN113131700A (en) | High power density in-wheel motor structure | |
| CN107493004A (en) | A kind of modularization cylindrical permanent linear synchronous motor | |
| CN109687671A (en) | Axial parallel type bimorph transducer multiphase permanent magnet fault-tolerant electric machine | |
| CN110212659B (en) | Double-salient-pole motor | |
| CN110112852B (en) | Double-fed permanent magnet motor | |
| Yang et al. | Comparative performance analysis of bearingless switched reluctance motor | |
| CN111934508A (en) | Radial magnetic field coreless permanent magnet synchronous motor | |
| CN111130229A (en) | Novel double-stator bearingless switched reluctance motor | |
| CN218514180U (en) | Permanent magnet motor with special-shaped groove | |
| CN217642894U (en) | Direct-current excitation type bearingless magnetic flux switching permanent magnet motor | |
| Xu et al. | Magnetic unbalance and thrust ripple reduction design for novel PMLSM with Halbach consequent pole | |
| CN112701823B (en) | Rotor core, motor and air conditioning unit | |
| CN210092991U (en) | Rotor core, stepped bidirectional magnetic beam tidying groove rotor, motor and compressor | |
| CN211405628U (en) | Novel double-stator bearingless switched reluctance motor | |
| CN208890610U (en) | A kind of permanent-magnet synchronous rimless motor of the rotor without silicon steel structure | |
| CN218335475U (en) | Built-in asymmetric pole arc angle U-shaped permanent magnet rotor | |
| CN209562264U (en) | A kind of rotor, motor and compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200918 |