CN113991957B - Single-phase double-magnetic-circuit permanent magnet motor and driving method - Google Patents
Single-phase double-magnetic-circuit permanent magnet motor and driving method Download PDFInfo
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- CN113991957B CN113991957B CN202111361097.5A CN202111361097A CN113991957B CN 113991957 B CN113991957 B CN 113991957B CN 202111361097 A CN202111361097 A CN 202111361097A CN 113991957 B CN113991957 B CN 113991957B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—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
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2793—Rotors axially facing stators
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
Abstract
The invention relates to the field of new energy automobile motors, in particular to a single-phase double-magnetic-circuit permanent magnet motor and a driving method, wherein the permanent magnet motor comprises a stator assembly, a rotor assembly and a rotating shaft assembly; the stator assembly comprises a stator disc, an iron core arranged on the stator disc and a winding wound on the iron core, and the winding is connected with a single-phase alternating-current power supply; the rotor assembly comprises a rotor disc and a first permanent magnet; the first permanent magnet is arranged on the rotor disc; the rotating shaft assembly comprises a rotating shaft and a second permanent magnet; the rotating shaft penetrates through the axes of the rotor disc and the stator disc, is fixedly connected with the rotor disc and is rotationally connected with the stator disc; the second permanent magnet is arranged in the rotating shaft; the first permanent magnet and the second permanent magnet are opposite in polarity direction, and different in magnetic field intensity. The invention can realize the self-starting of the permanent magnet motor and avoid setting a complicated starting circuit and auxiliary equipment.
Description
Technical Field
The invention relates to the field of new energy automobile motors, in particular to a single-phase double-magnetic-circuit permanent magnet motor and a driving method.
Background
With the wide popularization of new energy automobiles, the performance requirements on the new energy automobiles are higher and higher. The permanent magnet motor is widely applied to new energy automobiles due to high efficiency and high power factors. In a general permanent magnet motor structure, an electromagnetic torque of a permanent magnet motor is generated by interaction between a rotating magnetic field generated by a stator current and a magnetic field of a permanent magnet rotor, and when a single-phase alternating current is applied to the permanent magnet motor, the average value of the torque is zero, and the permanent magnet motor cannot be self-started. In the prior art, in order to realize the starting of the permanent magnet motor, three methods are generally included, one of which is to use an asynchronous motor with the same number of magnetic pole pairs to drive the starting, the other is to add a starting capacitor or a driving auxiliary winding to carry out the asynchronous starting, and the third is to use a frequency converter to gradually increase the power supply frequency at two ends of a stator to carry out the variable frequency starting.
The starting mode can realize the starting of the single-phase permanent magnet motor only by designing a complex circuit and adding an auxiliary structure, which will influence the cost and the volume of the single-phase permanent magnet motor.
Disclosure of Invention
In order to solve the problem that the single-phase permanent magnet motor cannot be started automatically, the invention provides a single-phase double-magnetic-circuit permanent magnet motor on the one hand and a driving method for driving the single-phase double-magnetic-circuit permanent magnet motor on the other hand, and the specific technical scheme is as follows.
On one hand, the single-phase double-magnetic-circuit permanent magnet motor provided by the invention comprises a stator assembly, a rotor assembly and a rotating shaft assembly;
the stator assembly comprises a stator disc, an iron core arranged on the stator disc and a winding wound on the iron core, and the winding is connected with a single-phase alternating current power supply;
the rotor assembly comprises a rotor disc and a first permanent magnet; the first permanent magnet is arranged on the rotor disc;
the rotating shaft assembly comprises a rotating shaft and a second permanent magnet; the rotating shaft penetrates through the axes of the rotor disc and the stator disc, is fixedly connected with the rotor disc and is rotationally connected with the stator disc; the second permanent magnet is arranged in the rotating shaft;
the first permanent magnet and the second permanent magnet are opposite in polarity direction, and different in magnetic field intensity.
Further, two rotor assemblies are included and are symmetrically arranged along the stator disc;
and iron cores are symmetrically arranged on two sides of the stator disc respectively, and each iron core is wound with a winding.
Furthermore, a magnetic conduction assembly is installed on one side, close to the stator disc, of the rotor disc;
the magnetic conduction assembly comprises a first magnetic conduction assembly and a second magnetic conduction assembly; the first magnetic conducting assembly comprises a first magnetic conducting rod arranged along the circumference of the rotor disc; the first permanent magnet is arranged in the first magnetic conduction rod; the second magnetic conduction assembly comprises a second magnetic conduction rod arranged along the circumference of the rotor disc and a magnetic conduction block connected with the second magnetic conduction rod;
the first magnetic conduction assembly and the second magnetic conduction assembly are arranged at intervals along the circumferential direction of the rotor disc.
Furthermore, the magnetic conduction assembly comprises four first magnetic conduction assemblies and four second magnetic conduction assemblies; four iron cores are respectively arranged on each side of the stator disc;
the four first magnetic conduction assemblies are arranged at intervals of 90 degrees, the four second magnetic conduction assemblies are arranged at intervals of 90 degrees, and the adjacent first magnetic conduction assemblies and the adjacent second magnetic conduction assemblies are arranged at intervals of 45 degrees; the four cores located on the same side of the stator disc are arranged at intervals of 90 degrees.
Further, before the permanent magnet motor is started, the iron core is located between the first magnetic conduction assembly and the second magnetic conduction assembly in the circumferential direction.
Further, the second magnetic conduction rod is in contact with the rotating shaft.
Furthermore, the iron core is triangular, and the shape and the size of the magnetic conduction block are the same as those of the iron core.
Further, the stator disc comprises a stator disc body and a stator disc outer circle layer surrounding the stator disc body; the magnetic resistance of the outer circle layer of the stator disc is smaller than that of the stator disc body; the magnetic field axis of the first permanent magnet penetrates through the outer circle layer of the stator disc.
Furthermore, a convex block protruding towards the direction of the iron core is arranged on the first magnetic conducting rod; one side of the iron core, which faces the first magnetic conducting rod, is attached with a magnetic guiding sheet.
In another aspect, the present invention provides a method of driving the permanent magnet motor described above, comprising applying a single phase alternating current to the permanent magnet motor such that each 90 ° rotation of the rotor assembly corresponds to a current cycle.
Has the advantages that: according to the single-phase double-magnetic-circuit permanent magnet motor, the first permanent magnet is arranged on the rotor disc, the second permanent magnet is arranged on the rotating shaft, when the motor is started, positive current and negative current respectively form two magnetic circuits when single-phase alternating current is introduced, two types of torque in opposite directions are applied to the rotor assembly respectively, the first permanent magnet and the second permanent magnet are designed to be different in size, the magnetic field intensity of the two magnetic circuits is different, the two types of torque are different in size, the permanent magnet motor is started automatically, a complex circuit and an additional auxiliary structure are avoided, and the cost and the volume of the single-phase permanent magnet motor are reduced.
Drawings
Fig. 1 is a schematic overall structure diagram of a single-phase permanent magnet motor according to an embodiment of the present invention;
FIG. 2 is a schematic view of a rotor assembly according to an embodiment of the present invention;
FIG. 3 is a schematic view of a stator assembly according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an electromagnetic circuit for starting a single-phase permanent magnet motor according to an embodiment of the present invention;
fig. 5 is a schematic electromagnetic circuit diagram of a single-phase permanent magnet motor after the rotor assembly rotates 45 ° in an embodiment of the present invention.
Reference numerals: 1. a first rotor assembly; 2. a stator assembly; 3. a second rotor assembly; 4. a rotating shaft assembly; 11. a first permanent magnet; 12. a rotor disk; 13. a first magnetic conducting rod; 14. a bump; 15. a second magnetic conducting rod; 16. a magnetic conduction block; 21. an iron core; 22. a winding; 23. a magnetic guiding sheet; 24. a stator disc body; 25. an outer circle layer of the stator disc; 41. a rotating shaft; 42. a second permanent magnet; 100. a first closed magnetic circuit; 200. a second closed magnetic circuit; 300. and a third closed magnetic circuit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Referring to fig. 1, in the present embodiment, a single-phase dual-magnetic-circuit permanent magnet motor is disclosed, which includes a stator assembly 2, two rotor assemblies, and a rotating shaft assembly 4.
Referring to fig. 3, the stator assembly 2 includes a stator plate on which 8 pieces of cores 21 are mounted in total, 4 pieces of cores 21 being mounted on each side of the stator plate, respectively, and cores 21 mounted on the stator plate, the cores 21 on each side of the stator plate being arranged around the axis of the stator plate, respectively, with a 90 ° interval between adjacent cores 21; each iron core 21 is wound with a winding 22, each winding 22 is connected with a single-phase alternating current power supply in a parallel connection mode, and the directions of magnetic fields generated when the windings 22 are electrified in the same direction are the same.
Referring to fig. 1 and 2, in the present embodiment, two rotor assemblies are a first rotor assembly 1 and a second rotor assembly 3, respectively, and the first rotor assembly 1 and the second rotor assembly 3 are symmetrically arranged along a stator disc, and have the same structure, so that only the first rotor assembly 1 will be described in detail.
Referring to fig. 2, the first rotor assembly 1 comprises a rotor disc 12, a magnetically conductive assembly and a first permanent magnet 11; the magnetic conduction assembly comprises a first magnetic conduction assembly and a second magnetic conduction assembly, the number of the first magnetic conduction assemblies is 4, each magnetic conduction assembly comprises 1 magnetic conduction rod, one end of each magnetic conduction rod is connected with the rotor disc 12, the other end of each magnetic conduction rod extends towards the stator disc and is provided with an embedding cavity, and a first permanent magnet 11 is embedded into each embedding cavity respectively. And, 4 groups of the first magnetic conductive assemblies are distributed at intervals of 90 ° on the outer circle of the rotor disc 12. The second magnetic conduction assemblies also have 4 groups, and each group respectively comprises a second magnetic conduction rod 15 and a magnetic conduction block 16; one end of each second magnetic conducting rod 15 is adjacent to the magnetic conducting block 16, and the other end extends towards the axis of the rotor disc 12; the 4 groups of second magnetic conductive assemblies are respectively installed on the rotor disc 12 and are arranged at intervals of 90 °. The first magnetic conduction assembly and the second magnetic conduction assembly are separated by 45 degrees.
Referring to fig. 1 to 3, the rotating shaft assembly 4 includes a rotating shaft 41 and a second permanent magnet 42, and both ends of the rotating shaft 41 are respectively connected to the rotor disks 12 of the first rotor assembly 1 and the second rotor assembly 3 and rotate therewith; the axis of the stator disc is provided with a through hole for accommodating the rotating shaft 41 to pass through, and the rotating shaft 41 passes through the stator disc along the through hole, does not contact with the stator disc and rotates relative to the stator disc. The second permanent magnet 42 is embedded in the rotating shaft 41 and is located at the center of the rotating shaft 41, namely, at the center of the stator disc; and the second permanent magnet 42 is parallel to the magnetic field axis of the first permanent magnet, but of opposite polarity. The first rotor assembly 1, the stator assembly 2, the second rotor assembly 3 and the rotating shaft assembly 4 are coaxially arranged.
In this embodiment, each winding 22 is connected to a single-phase ac power supply, and the current passing through the winding 22 in the first half period is set to be a positive current, and the current passing through the winding 22 in the second half period is set to be a negative current.
Taking the state of the permanent magnet motor shown in fig. 4 as an example, the magnetic field direction of the first permanent magnet 11 is set from left to right, and the magnetic field direction of the second permanent magnet 42 is set from right to left; a magnetic field in the left-to-right direction generated by each iron core 21 when a positive current is introduced into the winding 22 is set, and a magnetic field in the right-to-left direction generated by each iron core 21 when a negative current is introduced into the winding 22 is set.
When the permanent magnet motor is started, the iron cores 21 are respectively positioned between the two adjacent first magnetic guiding assemblies and the second magnetic guiding assemblies. When the coil passes through the forward current, a magnetic field is generated in each iron core 21 from left to right, and the magnetic field passes through the air gap and reaches the second magnetic conductive assembly, then passes through the rotating shaft 41 and reaches the second permanent magnet 42, and finally passes through the air gap again and reaches the iron core 21, so that the first closed magnetic circuit 100 is formed. Because the magnetic resistance of the air gap is very large and much larger than that of the second magnetic conduction assembly, based on the magnetic field minimum magnetic resistance path circulation principle, the magnetic field passing through the air gap between the iron core 21 and the second magnetic conduction assembly is reduced, so that the second magnetic conduction assembly is close to the nearest iron core 21, and the rotor assembly generates counterclockwise torque when viewed from left to right in fig. 4. When the coil passes through the negative current, a magnetic field is generated in the iron core 21 from right to left, the magnetic field passes through the air gap, reaches the first magnetic conducting assembly and the first permanent magnet 11 on the first rotor assembly 1, then passes through the air gap and the stator disc, reaches the first permanent magnet assembly and the first permanent magnet 11 on the second rotor assembly 3, and finally passes through the air gap and returns to the iron core 21 to form a second closed magnetic circuit 200. Because the magnetic resistance of air gap is very big, is greater than the magnetic resistance of first magnetic conduction subassembly, based on magnetic field minimum magnetic resistance route circulation principle, the air gap that magnetic field passed between iron core 21 and the first magnetic conduction subassembly can dwindle, consequently first magnetic conduction subassembly can draw close towards nearest iron core 21, sees from a left side to the right side along fig. 4, and the rotor subassembly produces clockwise's torque. Due to the different sizes of the first permanent magnet 11 and the second permanent magnet 42, the magnetic field strengths are different, so that the magnetic field strengths of the first closed magnetic circuit 100 and the second closed magnetic circuit 200 are different, and the generated torques are different. When the magnetic field strength of the first closed magnetic circuit 100 is greater than the magnetic field strength of the second closed magnetic circuit 200, the counterclockwise torque is always greater than the clockwise torque, so that the rotor assembly is started in the counterclockwise direction. When the magnetic field strength of the first closed magnetic circuit 100 is less than that of the second closed magnetic circuit 200, the counterclockwise torque is always less than the clockwise torque, so that the rotor assembly rotates toward the clockwise direction.
In the present embodiment, in order to ensure smooth magnetic conduction according to the first closed magnetic circuit 100 and the second closed magnetic circuit 200 when the permanent magnet motor is energized, it is necessary to reduce the magnetic resistance in each closed magnetic circuit as much as possible. Thus, the stator disc comprises a stator disc body 24, and a stator disc outer layer 25 surrounding the stator disc body 24; the magnetic resistance of the stator disc outer circle layer 25 is smaller than that of the stator disc body 24, and the magnetic field axis of the first permanent magnet 11 penetrates through the stator disc outer circle layer 25, so that the second closed magnetic circuit 200 does not leak magnetic flux to the stator disc body 24 when penetrating through the stator disc outer circle layer 25. One end of the second flux guide rod 15, which is far away from the flux guide block 16, is connected to the rotating shaft 41, so as to reduce unnecessary air gaps in the first closed magnetic circuit 100, and further keep the first closed magnetic circuit 100 to be smoothly conducted. In addition, the shape of the iron core 21 is designed to be triangular, the shape and the size of the magnetic conducting block 16 are designed to be the same as those of the iron core 21, a magnetic conducting sheet 23 is attached to one side of the iron core 21, which faces the first magnetic conducting rod 13, a convex block 14 protruding towards the direction of the iron core 21 is arranged on the first magnetic conducting rod 13, and smooth conduction of the second closed magnetic circuit 200 is further ensured.
In this embodiment, in order to avoid the rotor assembly from being worn by friction during rotation, a gap exists between the first magnetic conducting rod 13 and the stator disc.
Example 2
The embodiment provides a driving method for driving a permanent magnet motor in embodiment 1, which specifically includes applying a single-phase alternating current to the permanent magnet motor to drive the permanent magnet motor to start; when the permanent magnet motor is started smoothly, the rotor assembly corresponds to a current period when rotating 90 degrees, namely, the direction of current is switched when the rotor rotates 45 degrees.
Specifically, after the permanent magnet motor is started successfully, referring to fig. 4, it is set that the winding 22 is supplied with a negative current of the next half cycle, the iron core 21 generates a magnetic field from right to left, and forms a second closed magnetic circuit 200 with the nearest first magnetic conductive component and the first permanent magnet 11, when viewed from left to right in fig. 4, the rotor assembly generates a clockwise torque, and the rotor assembly rotates 45 ° to the state shown in fig. 5 under the torque and the inertia. At this time, the current enters the positive current of the first half cycle again, the iron core 21 generates a magnetic field from left to right, and the third closed magnetic circuit 300 is formed with the nearest second magnetic conductive component and the second permanent magnet 42, and at this time, as seen from left to right in fig. 5, based on the magnetic field minimum reluctance path circulation principle, the rotor component still generates a clockwise torque, so as to continuously drive the rotor to move in the clockwise direction.
In the same current cycle, the magnetic field successively passes through two different paths to form a closed loop, so that the rotor assembly rotates by 90 degrees, and after the next current cycle is started, the magnetic flux path is switched every 45 degrees for the motor rotor to continuously operate.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. The utility model provides a single-phase dual magnetic circuit permanent-magnet machine, includes stator module and rotor subassembly, its characterized in that: the rotating shaft assembly is also included;
the stator assembly comprises a stator disc, an iron core arranged on the stator disc and a winding wound on the iron core, and the winding is connected with a single-phase alternating-current power supply;
the rotor assembly comprises a rotor disc and a first permanent magnet; the first permanent magnet is arranged on the rotor disc;
the rotating shaft assembly comprises a rotating shaft and a second permanent magnet; the rotating shaft penetrates through the axes of the rotor disc and the stator disc, is fixedly connected with the rotor disc and is rotationally connected with the stator disc; the second permanent magnet is arranged in the rotating shaft;
the first permanent magnet and the second permanent magnet are opposite in polarity direction, and different in magnetic field intensity;
the stator comprises two rotor assemblies which are symmetrically arranged along a stator disc;
iron cores are symmetrically arranged on two sides of the stator disc respectively, and each iron core is wound with a winding;
a magnetic conduction assembly is arranged on one side, close to the stator disc, of the rotor disc;
the magnetic conduction assembly comprises a first magnetic conduction assembly and a second magnetic conduction assembly; the first magnetic conducting assembly comprises a first magnetic conducting rod arranged along the circumference of the rotor disc; the first permanent magnet is arranged in the first magnetic conduction rod; the second magnetic conduction assembly comprises a second magnetic conduction rod arranged along the circumference of the rotor disc and a magnetic conduction block connected with the second magnetic conduction rod;
the first magnetic conduction assembly and the second magnetic conduction assembly are arranged at intervals along the circumferential direction of the rotor disc;
before the permanent magnet motor is started, the iron core is located between the first magnetic conduction assembly and the second magnetic conduction assembly in the circumferential direction.
2. A single-phase dual-magnetic circuit permanent magnet machine according to claim 1, wherein: the magnetic conduction assembly comprises four first magnetic conduction assemblies and four second magnetic conduction assemblies; four iron cores are respectively arranged on each side of the stator disc;
the four first magnetic conduction assemblies are arranged at intervals of 90 degrees, the four second magnetic conduction assemblies are arranged at intervals of 90 degrees, and the adjacent first magnetic conduction assemblies and the adjacent second magnetic conduction assemblies are arranged at intervals of 45 degrees; the four iron cores positioned on the same side of the stator disc are arranged at intervals of 90 degrees.
3. A single-phase dual-magnetic circuit permanent magnet machine according to claim 1, wherein: the second magnetic conducting rod is in contact with the rotating shaft.
4. A single-phase dual-magnetic circuit permanent magnet machine according to claim 1, wherein: the iron core is triangular, and the shape and the size of the magnetic conduction block are the same as those of the iron core.
5. A single-phase dual-magnetic circuit permanent magnet motor according to any of claims 1 to 4, characterized in that: the stator disc comprises a stator disc body and a stator disc outer circle layer surrounding the stator disc body; the magnetic resistance of the outer circle layer of the stator disc is smaller than that of the stator disc body; the magnetic field axis of the first permanent magnet penetrates through the outer circle layer of the stator disc.
6. A single-phase dual-magnetic circuit permanent magnet machine according to claim 5, characterized in that: the first magnetic conducting rod is provided with a convex block protruding towards the direction of the iron core; one side of the iron core, which faces the first magnetic conducting rod, is attached with a magnetic guiding sheet.
7. A method of driving the permanent magnet electric machine of claim 2, comprising applying a single phase alternating current to the permanent magnet electric machine for one current cycle for each 90 ° rotation of the rotor assembly.
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| CN202111361097.5A CN113991957B (en) | 2021-11-17 | 2021-11-17 | Single-phase double-magnetic-circuit permanent magnet motor and driving method |
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| CN202111361097.5A CN113991957B (en) | 2021-11-17 | 2021-11-17 | Single-phase double-magnetic-circuit permanent magnet motor and driving method |
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| CN113991957B true CN113991957B (en) | 2022-12-06 |
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