CN207835193U - P-m rotor, magneto and compressor - Google Patents
P-m rotor, magneto and compressor Download PDFInfo
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- CN207835193U CN207835193U CN201820108410.1U CN201820108410U CN207835193U CN 207835193 U CN207835193 U CN 207835193U CN 201820108410 U CN201820108410 U CN 201820108410U CN 207835193 U CN207835193 U CN 207835193U
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- Prior art keywords
- rotor
- permanent magnet
- iron core
- magnet combination
- mounting groove
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000004907 flux Effects 0.000 claims abstract description 7
- 230000002045 lasting effect Effects 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 230000001012 protector Effects 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 9
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 239000003292 glue Substances 0.000 abstract description 12
- 230000009471 action Effects 0.000 abstract description 3
- 238000004804 winding Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 238000009941 weaving Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model provides a kind of p-m rotor, magneto and compressor, it is related to technical field of motors, including iron core and permanent magnet combination, the lasting magnetic flux of the permanent magnet combination is for establishing rotor field, permanent magnet combination quantity be n, n >=2, permanent magnet combination by m set of permanent magnets at, m >=1, each permanent magnet combination are identical as iron core binding face polarity；At least two mounting grooves combined for fixed permanent magnet are provided on the iron core, and the mounting groove is uniformly in the circumferentially disposed of the iron core.P-m rotor, magneto and compressor provided by the utility model on p-m rotor by being arranged mounting groove, permanent magnet combination is arranged in mounting groove, the intensity that permanent magnet combination is combined with iron core is improved in this way, ensure in the case of motor high-speed rotation, glue is under huge centrifugal action, and glue failure, permanent magnet combination and iron core will not detach, ensure the proper motion of magneto, it is ensured that the proper motion of compressor.
Description
Technical field
The utility model is related to technical field of motors, more particularly, to a kind of p-m rotor, magneto and compressor.
Background technology
Motor is the driving device of the various equipment such as wind turbine, pump, compressor, lathe, transmission belt, weaving loom, extensive use
It is the maximum power consumption machinery of electricity consumption in multiple industries such as metallurgy, petrochemical industry, chemical industry, coal, building materials, public utility and field.According to
Statistical calculation, 2011, about 1,700,000,000 kilowatts of China's motor ownership, about 3,000,000,000,000 kilowatt hour of total power consumption accounted for the total electricity consumption of the whole society
The 64% of amount, wherein industrial circle motor total electricity consumption are 2.6 trillion kilowatt hours, account for about the 75% of commercial power.
Currently, the problem of there is the following aspects during motor use.First, it in motor application operating mode, bears
Load rate is often all insufficient so that electric efficiency is very low.For example, it is maximum pressure to obtain the universal type selecting of air compressor in textile mills
7.5bar, due to the upgrading of weaving loom and the consciousness reinforcement of energy-saving and emission-reduction and the needs for reducing cost, present textile mills make
It is usually 4bar~5bar with compressed air pressure, the load percentage for the air compressor for being thus declines, and electric efficiency is big
The phenomenon that width declines, " low load with strong power " that makes is even more serious.
Secondly, asynchronous machine is widely used, and asynchronous machine rotor winding can consume part electric energy, the loss in the form of generating heat
Account for about the 20%~30% of motor total losses, the efficiency of motor reduces, while influencing the service life of motor.Meanwhile rotor around
It is in inductance current after group exciting current conversion to stator winding, the electric current into stator winding is made to lag behind one angle of network voltage
Degree, causes the power factor of motor to reduce.
Again, when starting asynchronous motor, it is desirable that motor has sufficiently large starting torque, but wishes that starting current should not
It is too big, in case power grid generates excessive voltage landing and influences the normal fortune of other electric machinery and apparatus being connected on power grid
Row.In addition, when starting current is excessive, motor itself will be made to be done power by excessive electricity and impacted, if often start, also make around
The danger of group overheat.Therefore, the starting design of asynchronous machine is often faced with dilemma.
To sum up, that there are power factors is low for conventional asynchronous motor, and motor working efficiency is low, and starting current is big, and it is steady to influence power grid
It is fixed, the problem of rotor windings consume electric energy in the form of generating heat, motor service life is impacted etc..To solve the above problems,
Propose the concept of permanent magnet synchronous motor, i.e., in the structure of conventional asynchronous motor, by the way that rotor windings are become p-m rotor,
Constitute permanent-magnet rotor synchronous motor.Magnetic flux can be provided to motor by p-m rotor, induce electromotive force in the stator windings,
Exciting current is reduced, to can both improve motor power factor, improves motor working efficiency, starting current becomes smaller, and starts and turns round
Square increases, while can reduce the thermal energy consumption of rotor windings, extends motor service life, and energy-saving effect protrudes.
But in the actual production process, it between permanent magnet and iron core, is bonded by glue, under motor low-speed situations,
Glue bonding can be used normally, or can use the long period, but under motor high-speed case, specifically be greater than
When 3500 revs/min, for glue under huge centrifugation force effect, while in the case of a high temperature, glue failure leads to permanent magnet
It falls, so that magneto breaks down.
Utility model content
The purpose of this utility model is to provide p-m rotor, magneto and compressors, to alleviate present permanent magnetism
Motor the technical issues of permanent magnet detaches with iron core, magneto is caused to break down under high speed rotation.
A kind of p-m rotor provided by the utility model, including iron core and permanent magnet combination, the permanent magnet combination are held
Continuous magnetic flux is for establishing rotor field, and permanent magnet combination quantity is n, n >=2, permanent magnet combination by m set of permanent magnets at, m >=
1, each permanent magnet combination is identical as iron core binding face polarity；
At least two mounting grooves combined for fixed permanent magnet are provided on the iron core, and the mounting groove uniformly exists
The iron core it is circumferentially disposed.
Further, the longitudinal section of the mounting groove is rectangle；And the permanent magnet combination is coincide with the mounting groove.
Further, the longitudinal section of the mounting groove is trapezoidal, the bottom of the trapezoidal permanent magnet combination and mounting groove
Bottom contacts.
Further, non-magnetic metal protection protector is arranged in the p-m rotor circumferential surface.
Further, the thickness of the non-magnetic metal protection protector is 1-10mm.
Further, it is interference fit between the non-magnetic metal protection protector and permanent magnet combination.
Further, further include rotor pressing ring, the rotor pressing ring is arranged at the both ends of the iron core.
Further, further include sealing ring；The non-magnetic metal protection protector is located between two rotor pressing rings, institute
Sealing ring is stated between the non-magnetic metal protection protector and the rotor pressing ring.
The utility model also provides a kind of magneto, including p-m rotor as described above, main shaft, stator, pedestal,
Shell, fan blade, fan housing, the p-m rotor are fixed on main shaft, and the track ring is arranged around p-m rotor, the stator setting
In in shell, connected by bearing between the shell and main shaft；The fan blade is set on main shaft, tight between fan housing and shell
It is solidly connected.
The utility model also provides a kind of compressor, using magneto described above.
P-m rotor, magneto and compressor provided by the utility model are by being arranged mounting groove on p-m rotor, forever
Magnet combination is arranged in mounting groove, improves the intensity that permanent magnet combination is combined with iron core in this way, it is ensured that turns in motor high speed
In the case of dynamic, glue is under huge centrifugal action, and glue failure, permanent magnet combination and iron core will not detach, it is ensured that forever
The proper motion of magneto, it is ensured that the proper motion of compressor.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram for the p-m rotor that the utility model embodiment provides；
Fig. 2 is the structural schematic diagram for another p-m rotor that the utility model embodiment provides；
Fig. 3 is the structural schematic diagram of another angle of p-m rotor shown in Fig. 1；
Fig. 4 is the partial enlarged view of p-m rotor shown in Fig. 3.
Icon：100- iron cores；200- mounting grooves；300- permanent magnet combinations；The non-magnetic metal protection protectors of 400-；
500- rotor pressing rings；600- sealing rings.
Specific implementation mode
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
The every other embodiment that field those of ordinary skill is obtained without making creative work, belongs to this practicality
Novel protected range.
It is in the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
The utility model and simplifying describes for ease of description, do not indicate or imply the indicated device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned art with concrete condition
The concrete meaning of language in the present invention.
Fig. 1 is the structural schematic diagram for the p-m rotor that the utility model embodiment provides；Fig. 2 is the utility model embodiment
The structural schematic diagram of another p-m rotor of offer.
As Figure 1-Figure 2, a kind of p-m rotor provided by the utility model, including iron core 100 and permanent magnet combination
300, the lasting magnetic flux of the permanent magnet combination 300 is for establishing rotor field, and 300 quantity of permanent magnet combination is n, n >=2,
For permanent magnet combination 300 by m set of permanent magnets at, m >=1, each permanent magnet combination 300 is identical as 100 binding face polarity of iron core；
At least two mounting grooves 200 for fixed permanent magnet combination 300, and the peace are provided on the iron core 100
Tankage 200 is uniformly in the circumferentially disposed of the iron core 100.
In some embodiments, multiple mounting grooves 200, the number 2 of general mounting groove 200,4 are uniformly arranged on iron core 100
It is a, 6；Permanent magnet combination 300 is mounted in mounting groove 200, can be for singly in permanent magnet combination 300 in each mounting groove 200
A permanent magnet, can also multiple single set of permanent magnets at permanent magnet combination 300 be mounted on mounting groove 200 in.
Each permanent magnet combination 300 is the poles S with 100 binding face of iron core；300 outside of permanent magnet combination is the poles N.
In some embodiments, each permanent magnet combination 300 and 100 binding face of iron core are the poles N；Outside permanent magnet combination 300
Face is the poles S.
P-m rotor replaces the coil of asynchronous machine rotor using permanent magnet combination 300, and electricity can be given by p-m rotor
Machine provides magnetic flux, induces electromotive force in the stator windings, reduces exciting current, can both improve motor power factor, improves
Motor working efficiency, starting current become smaller, and starting torque increases, while can reduce the thermal energy consumption of rotor windings, extend electricity
Machine service life, energy-saving effect protrude.
On above-described embodiment basis, further, the longitudinal section of the mounting groove 200 is rectangle；And it is described forever
Magnet combination 300 is coincide with the mounting groove 200.
In some embodiments, the longitudinal section of mounting groove 200 is rectangle, and what permanent magnet combination 300 can coincide is mounted on
In mounting groove 200, and 300 outer wall of permanent magnet combination can form a cylinder with 100 outer wall of iron core.
On above-described embodiment basis, further, the longitudinal section of the mounting groove 200 is trapezoidal, trapezoidal institute
The bottom for stating permanent magnet combination 300 is contacted with 200 bottom of mounting groove.
In some embodiments, the longitudinal section of mounting groove 200 is trapezoidal, and trapezoidal bottom is towards mounting groove 200；That is the peace
The width of the opening of tankage 200 is less than the width of 200 bottom of mounting groove；When the permanent magnet combination 300 coincideing with mounting groove 200 is pacified
After being filled with, though motor when high speed rotation, even if under the high temperature conditions, what permanent magnet combination 300 and iron core 100 bonded
Glue fails, and permanent magnet combination 300 can not be also detached from from mounting groove 200, i.e., permanent magnet combination 300 will not be from p-m rotor
It falls off, it is ensured that the operation for the high speed that magneto can be permanent.
In some embodiments, 300 outer wall of permanent magnet combination can form a cylinder with 100 outer wall of iron core.
When permanent magnet combination 300 is using tile, shape and 300 shape of permanent magnet combination of mounting groove 200 are kissed
It closes；Permanent magnet generally uses silicon steel material.
On above-described embodiment basis, further, non-magnetic metal, which is arranged, in the p-m rotor circumferential surface protects
Sheath 400.
On some embodiment bases, non-magnetic metal protection protector 400 is arranged on p-m rotor, non-magnetic metal is protected
Sheath 400 can will be on 300 secured core 100 of permanent magnet combination on iron core 100.
When mounting groove 200 is rectangle on iron core 100 when motor is in high-speed rotation, and in hot conditions
Under, glue under huge centrifugation force effect, glue failure, permanent magnet combination 300 by non-magnetic metal protection protector 400 work
With making permanent magnet combination 300 not detached with iron core 100, to improve the service life of magneto, prevent permanent magnet
Combination 300 is detached with iron core 100 and the failure that occurs.
And non-magnetic metal protection protector 400 also has and keeps p-m rotor appearance beautiful, and will not be by extraneous iron filings, dust
The effect of equal pollutions.
On above-described embodiment basis, further, the thickness of the non-magnetic metal protection protector 400 is 1-
10mm。
According to playing the role of difference, when mounting groove 200 is rectangle, the thickness of non-magnetic metal protection protector 400
Thicker design may be used, when mounting groove 200 is trapezoidal, the thickness of non-magnetic metal protection protector 400 may be used
Relatively thin design.
On above-described embodiment basis, further, the non-magnetic metal protection protector 400 and permanent magnet combination
It is interference fit between 300.
Fig. 3 is the structural schematic diagram of another angle of p-m rotor shown in Fig. 1.
Further include rotor pressing ring 500 further based on above-described embodiment basis with reference to shown in Fig. 3, described turn
Sub- trim ring 500 is arranged at the both ends of the iron core 100.
Fig. 4 is the partial enlarged view of p-m rotor shown in Fig. 3.
With reference to shown in Fig. 4, it is based on above-described embodiment basis, further includes sealing ring 600 further；It is described non-to lead
Magnetic metal protection protector 400 is located between two rotor pressing rings 500, and the sealing ring 600, which is located at the non-magnetic metal, to be protected
Between sheath 400 and the rotor pressing ring 500.
P-m rotor upper rotor part trim ring 500 is mounted on iron core 100, and non-magnetic metal protection protector 400 is set in iron core 100
On；Nonmetallic protective case is fixed insecure on iron core 100 in order to prevent, and sealing ring 600 is also arranged on iron core 100；
400 one end of non-magnetic metal protection protector is closely bonded with rotor pressing ring 500, and the other end has one with another rotor pressing ring 500
Fixed gap is filled with sealing ring 600；Ensure that non-magnetic metal protection protector 400 and iron core 100 are opposing stationary in this way.
The utility model also provides a kind of magneto, including p-m rotor as described above, main shaft, stator, pedestal,
Shell, fan blade, fan housing, the p-m rotor are fixed on main shaft, and the track ring is arranged around p-m rotor, the stator setting
In in shell, connected by bearing between the shell and main shaft；The fan blade is set on main shaft, tight between fan housing and shell
It is solidly connected.
Herein it should be noted that magneto provided in this embodiment is provided with any of the above-described p-m rotor,
In practical applications, it is the reducing energy consumption for realizing asynchronous machine, on the basis of existing asynchronous machine, by by existing asynchronous electricity
The rotor windings of machine change into any of the above-described p-m rotor, you can realize magneto energy-saving effect, can also realize
Existing asynchronous machine remanufactures, and reduces the cost of asynchronous machine reducing energy consumption.
The technical advantage of magneto has been described, and details are not described herein again.
The utility model also provides a kind of compressor, using magneto described above.
It, can effectively band by FREQUENCY CONTROL and speed feedback between any of the above-described magneto and driver
Engine-driven air compressor works normally, and in the case, magneto can provide magnetic flux by p-m rotor to motor, in stator
Electromotive force is induced in winding, reduces exciting current, to can both improve motor power factor, improves motor working efficiency,
Starting current becomes smaller, and starting torque increases, while can reduce the thermal energy consumption of rotor windings, extends motor service life, section
It can effect protrusion.
Same principle, any of the above-described magneto can also effectively drive wind turbine, pump, lathe, transmission belt,
The normal works such as weaving loom.
P-m rotor, magneto and compressor provided by the utility model by p-m rotor be arranged mounting groove 200,
Permanent magnet combination 300 is arranged in mounting groove 200, improves the intensity that permanent magnet combination 300 is combined with iron core 100 in this way, really
It protects in the case of motor high-speed rotation, glue is under huge centrifugal action, glue failure, permanent magnet combination 300 and iron core
100 will not detach, it is ensured that the proper motion of magneto, it is ensured that the proper motion of compressor.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model, rather than limits it
System；Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should
Understand：It still can be with technical scheme described in the above embodiments is modified, either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacements, this practicality that it does not separate the essence of the corresponding technical solution are new
The range of each embodiment technical solution of type.
Claims (10)
1. a kind of p-m rotor, which is characterized in that including iron core and permanent magnet combination, the lasting magnetic flux of the permanent magnet combination
For establishing rotor field, permanent magnet combination quantity is n, n >=2, and permanent magnet combination is by m set of permanent magnets at, m >=1, each permanent magnetism
Body combination is identical as iron core binding face polarity；
At least two mounting grooves combined for fixed permanent magnet are provided on the iron core, and the mounting groove is uniformly described
Iron core it is circumferentially disposed.
2. p-m rotor according to claim 1, which is characterized in that the longitudinal section of the mounting groove is rectangle；And it is described
Permanent magnet combination is coincide with the mounting groove.
3. p-m rotor according to claim 1, which is characterized in that the longitudinal section of the mounting groove be it is trapezoidal, it is trapezoidal
The bottom of the permanent magnet combination is contacted with installation trench bottom.
4. p-m rotor according to claim 1, which is characterized in that non-magnetic gold is arranged in the p-m rotor circumferential surface
Belong to protective case.
5. p-m rotor according to claim 4, which is characterized in that the thickness of the non-magnetic metal protection protector is 1-
10mm。
6. p-m rotor according to claim 4, which is characterized in that the non-magnetic metal protection protector and permanent magnet combination
Between for interference fit.
7. p-m rotor according to claim 4, which is characterized in that further include rotor pressing ring, the rotor pressing ring setting
At the both ends of the iron core.
8. p-m rotor according to claim 7, which is characterized in that further include sealing ring；The non-magnetic metal coating
Set is located between two rotor pressing rings, the sealing ring be located at the non-magnetic metal protection protector and the rotor pressing ring it
Between.
9. a kind of magneto, which is characterized in that including such as claim 1-8 any one of them p-m rotor, main shaft, determine
Son, pedestal, shell, fan blade, fan housing, the p-m rotor are fixed on main shaft, and the track ring is arranged around p-m rotor, described
Stator is set in shell, is connected by bearing between the shell and main shaft；The fan blade is set on main shaft, fan housing and shell
It is fastenedly connected between body.
10. a kind of compressor, which is characterized in that using the magneto described in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820108410.1U CN207835193U (en) | 2018-01-23 | 2018-01-23 | P-m rotor, magneto and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820108410.1U CN207835193U (en) | 2018-01-23 | 2018-01-23 | P-m rotor, magneto and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207835193U true CN207835193U (en) | 2018-09-07 |
Family
ID=63394169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820108410.1U Active CN207835193U (en) | 2018-01-23 | 2018-01-23 | P-m rotor, magneto and compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207835193U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023422A (en) * | 2018-01-23 | 2018-05-11 | 江苏瑞斯曼节能技术有限公司 | P-m rotor, magneto and compressor |
| CN112782576A (en) * | 2019-11-11 | 2021-05-11 | 株洲中车时代电气股份有限公司 | Fan fault monitoring method and device of converter |
-
2018
- 2018-01-23 CN CN201820108410.1U patent/CN207835193U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023422A (en) * | 2018-01-23 | 2018-05-11 | 江苏瑞斯曼节能技术有限公司 | P-m rotor, magneto and compressor |
| CN112782576A (en) * | 2019-11-11 | 2021-05-11 | 株洲中车时代电气股份有限公司 | Fan fault monitoring method and device of converter |
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