CN112994285A - Aerogenerator silicon steel sheet with support fixed establishment - Google Patents
Aerogenerator silicon steel sheet with support fixed establishment Download PDFInfo
- Publication number
- CN112994285A CN112994285A CN202110410571.2A CN202110410571A CN112994285A CN 112994285 A CN112994285 A CN 112994285A CN 202110410571 A CN202110410571 A CN 202110410571A CN 112994285 A CN112994285 A CN 112994285A
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- silicon steel
- steel sheet
- steel sheets
- supporting
- temperature
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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
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
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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
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/25—Devices for sensing temperature, or actuated thereby
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
Abstract
The invention relates to a silicon steel sheet of a wind driven generator with a supporting and fixing mechanism, which relates to the field of generators and aims to solve the problems that in the prior art, a ventilation channel steel is adopted to weld I-steel on a stator iron core silicon steel sheet for reducing the temperature of a motor stator iron core, the surface of the silicon steel sheet generates a bulge, the iron core is not tightly stacked, the stator iron core can be loosened under the comprehensive actions of mechanical vibration, temperature change and electromagnetism, so that the motor fault is caused, and when the temperature of the motor is abnormal, the wind temperature at different positions needs to be manually measured; the multiple groups of silicon steel sheets are vertically arranged from top to bottom in sequence, a plurality of ventilation supporting grooves are formed between every two adjacent groups of silicon steel sheets, a plurality of end fasteners are uniformly welded and installed on the outer circular surface of each group of silicon steel sheets along the radial direction, and the temperature measuring assemblies are installed on the end fasteners. The invention is used in the field of power generation.
Description
Technical Field
The invention relates to the field of generators, in particular to a silicon steel sheet of a wind driven generator with a supporting and fixing mechanism.
Background
The temperature rise of the motor is an important index of the performance of the motor, particularly, a stator iron core is in close contact with a coil and is easy to cause heating of the iron core, in order to effectively reduce the temperature of the stator iron core of the motor, the traditional wind power permanent magnet synchronous generator and the like adopt a structure that ventilation channel steel is adopted, namely I-shaped steel is welded on a silicon steel sheet of the stator iron core to realize ventilation and heat dissipation of the iron core, spot welding of the silicon steel sheet and the I-shaped steel can generate a welding spot on the back of the silicon steel sheet, the welding spot can be higher than the surface of the silicon steel sheet to generate a bulge, so that the iron core is not tightly laminated, the stator iron core can be loosened under the comprehensive actions of mechanical vibration, temperature change and electromagnetism, the.
The method adopted at present is to grind the high welding points by manpower, thus solving the problems, but wasting a great deal of manpower and time. And if the welding spots are excessively polished, the insulating coating on the surface of the stator silicon steel sheet can be damaged, the loss of the stator iron core can be increased, the motor iron core is heated, even the motor fails, the motor temperature monitoring is very important, particularly, when the motor temperature is abnormal, testers are required to manually measure the wind temperatures at different positions, the safe operation of the motor and the subsequent temperature design optimization of the motor are supported by mastering the temperature data of the motor from time to time, and the optimization information is provided for the same model in the future. Therefore, there is a need to develop a support structure that can replace the i-steel.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the ventilation channel steel is adopted to weld I-shaped steel on a stator iron core silicon steel sheet for reducing the temperature of a motor stator iron core of a wind driven generator, the surface of the silicon steel sheet generates a bulge, the iron core is not tightly laminated, the stator iron core can be loosened under the comprehensive action of mechanical vibration, temperature change and electromagnetism, so that motor faults are caused, and the wind temperatures at different positions need to be manually measured when the motor temperature is abnormal, thereby providing the wind driven generator silicon steel sheet with a supporting and fixing mechanism.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the temperature measuring device comprises a temperature measuring assembly, a plurality of groups of silicon steel sheets, a plurality of end part buckles and a plurality of ventilation supporting grooves; the ventilation supporting grooves are strip-shaped shells, the cross section of each strip-shaped shell is trapezoidal, an opening is processed at the upper bottom of each trapezoid, two barbs are arranged at the opening of the upper bottom of each trapezoid, the openings of the two barbs at the upper bottom of each trapezoid are arranged in a reverse direction, a plurality of groups of silicon steel sheets are vertically and sequentially arranged from top to bottom, a plurality of ventilation supporting grooves are arranged between every two adjacent groups of silicon steel sheets, a plurality of groups of strip-shaped holes corresponding to the barbs at the ventilation supporting grooves are radially processed on each group of silicon steel sheets, the upper bottom of each ventilation supporting groove is propped against the end surface of one group of silicon steel sheets, the barbs at each ventilation supporting groove penetrate through the corresponding strip-shaped holes at one group of silicon steel sheets and are hooked on the other end surface of one group of silicon steel sheets, a plurality of end buckles are radially and uniformly welded on the outer circular surface of each group of silicon steel sheets, the top of each end buckle is, the temperature measuring component is arranged on the end parts of the plurality of end parts.
Compared with the prior art, the invention has the following beneficial effects:
1. the end part of the invention adopts a buckle piece type design, the end part can be effectively fixed, the temperature in the ventilation supporting groove 2 is monitored at any time through the temperature sensor 105, the temperature is displayed by controlling the singlechip U1, and the buzzer 103 can make a sound when the temperature is unreasonable, thereby ensuring the safe and stable operation of the motor. Remove welding process from between ventilation support groove 2 and multiunit silicon steel sheet 3, the last end top of ventilation support groove 2 is on the terminal surface of a set of silicon steel sheet 3, every barb 4 on the ventilation support groove 2 passes the bar hole that a set of silicon steel sheet 3 corresponds and hooks on another terminal surface of a set of silicon steel sheet 3, it is fixed tightly with a set of silicon steel sheet 3 clamp through a plurality of ventilation support grooves 2, guarantee that the silicon steel sheet can not receive the damage, prevent that the phenomenon of generator trouble from taking place, the colleague saves a large amount of costs of labor.
2. This application design simple structure, the installation of being convenient for and location easily.
3. The structure radiating effect of this application is good, and the ventilation of being convenient for can effectively reduce motor stator core temperature.
4. This application supports through ventilation support groove 2 and makes 3 atress of multiunit silicon steel sheet even, is difficult for moving of strikeing.
5. A plurality of tip buckles 1 can prevent the outside warpage of unshakable in one's determination, only need push the cramp into during the use, can press from both sides tight lamination through deformation naturally, and it is placed as required test position, and easy to assemble, after the installation is accomplished, can fix for preventing not hard up welding to tip buckle 1.
6. Through to temperature measurement subassembly and temperature display and alarm system, can effectively take notes the wind-warm syndrome of different test positions, effectively monitor the temperature to realize alarm signal.
7. The sliding rheostat R1 can facilitate debugging of multiple signal monitoring, and partial data acquisition and whole acquisition work are realized.
8. The present application may mount a temperature sensor 105. The location temperature is measured.
Drawings
Fig. 1 is an overall structural schematic diagram of the present application, and two ventilation support grooves 2 are oppositely arranged on two sides of a silicon steel sheet 3 at a middle position back to back in the diagram.
Fig. 2 is a schematic view showing that a plurality of ventilation support grooves 2 are radially installed on a fan-shaped silicon steel sheet, and the ventilation support grooves 2 are arranged in a gradually expanding direction.
Fig. 3 is a schematic cross-sectional view of a plurality of ventilation support grooves 2 installed on a fan-shaped silicon steel sheet.
Fig. 4 is a structural view of the end clip 1.
Fig. 5 is a top view of the end clasp 1.
FIG. 6 is a schematic circuit diagram of the temperature sensing assembly of the present application.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 5, and the silicon steel sheet with a supporting and fixing mechanism of the wind driven generator in the embodiment includes a temperature measuring assembly, a plurality of groups of silicon steel sheets 3, a plurality of end buckles 1 and a plurality of ventilation supporting grooves 2; the ventilation supporting grooves 2 are strip-shaped shells, the cross section of each strip-shaped shell is trapezoidal, an opening is processed at the upper bottom of each trapezoid, two barbs 4 are arranged at the opening of the upper bottom of each trapezoid, the openings of the two barbs 4 at the upper bottom of each trapezoid are arranged in a reverse direction, a plurality of groups of silicon steel sheets 3 are vertically and sequentially arranged from top to bottom, a plurality of ventilation supporting grooves 2 are arranged between every two adjacent groups of silicon steel sheets 3, a plurality of groups of strip-shaped holes corresponding to the barbs 4 on the ventilation supporting grooves 2 are processed on each group of silicon steel sheets 3 along the radial direction, the upper bottom of each ventilation supporting groove 2 is propped against the end surface of one group of silicon steel sheets 3, the barbs 4 on each ventilation supporting groove 2 penetrate through the corresponding strip-shaped holes on one group of silicon steel sheets 3 and are hooked on the other end surface of the group of silicon steel sheets 3, a plurality of end buckles 1 are uniformly and welded on the outer circular surface of each, the bottom of each end buckle 1 is fixedly connected with the upper end face of a group of silicon steel sheets 3 below, and the temperature measuring assemblies are arranged on the end buckles 1.
The width of barb 4 on the ventilation support groove 2 is the same with the bar hole width that barb 4 corresponds on every group silicon steel sheet 3 among this embodiment, presss from both sides tight 3 quick silicon steel sheets of every group through a plurality of ventilation support grooves 2.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 6, wherein the silicon steel sheet of the wind turbine generator with the supporting and fixing mechanism according to the present embodiment,
the temperature measuring component comprises a display 102, a buzzer 103, a plurality of temperature sensors 105 and a temperature measuring circuit;
the temperature measuring circuit comprises a singlechip U1, a triode Q, VCC power supply, a slide rheostat R1, a resistor R2 and a resistor R3;
one end of a resistor R2 is connected with a VCC power supply, the other end of the resistor R2 is connected with the anode of a buzzer 103, the cathode of the buzzer 103 is connected with the collector of a triode Q, the base of the triode Q is connected with one end of a resistor R3, the emitter of the triode Q is grounded, the other end of the resistor R3 is connected with a pin P3.7 of a singlechip U1, pins P0.0, P0.1, P0.2, P0.3, P0.4, P0.5, P0.6 and P0.7 of the singlechip U1 are respectively connected with pins D0, D1, D2, D3, D4, D5, D6 and D7 of a display 102 in a one-to-one correspondence manner, pins PI.0, P1.1 and P1.2 of the singlechip U1 are respectively connected with a pin RS end, a RW end and an E end of the display 102 in a one-to-ground, a VDD end and a VDD end of the display 102 and a VCC power supply end, a temperature sensor terminal and a plurality of a ground terminal of a monolithic U3985 are connected with a, the VCC power supply is connected to both the power terminals of the plurality of temperature sensors 105 and the moving terminal of the slide rheostat R1.
The slide rheostat R1 is a variable resistor, and changes in resistance value according to the change in the number of monitored signals, thereby facilitating debugging.
The resistor 2 has the function of current limiting protection and the resistance value of 50 ohms
The resistor 3 plays a role in current limiting protection and can also ensure the stability of the work of the triode Q and the circuit, and the resistance value is 1k ohm. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: in the embodiment, which is described with reference to fig. 1 to 4, each temperature sensor 105 is mounted on the top of the end buckle 1. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to fig. 3, and in the present embodiment, each group of silicon steel sheets 3 is formed by arranging a plurality of annular silicon steel sheets side by side, and each annular silicon steel sheet is formed by radially splicing a plurality of fan-shaped silicon steel sheets. Other components and connections are the same as in the first embodiment.
The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 and fig. 2, in the embodiment, a plurality of groups of supporting groove clamping openings are uniformly formed in each fan-shaped silicon steel sheet, each group of supporting groove clamping openings is composed of two parallel supporting groove clamping openings, and the supporting groove clamping openings in each fan-shaped silicon steel sheet are arranged in a gradually expanding direction. Other components and connections are the same as in the first embodiment.
The sixth specific implementation mode: in the wind turbine silicon steel sheet with the supporting and fixing mechanism according to the embodiment described above, the barb 4 on each ventilation supporting groove 2 is respectively disposed through the supporting groove fastening openings of the plurality of fan-shaped silicon steel sheets, and the barb 4 is hooked on the end surface of the fan-shaped silicon steel sheet at the end portion. Other components and connections are the same as in the first embodiment.
The seventh embodiment: in the present embodiment, the silicon steel sheet of the wind turbine generator with the supporting and fixing mechanism is described with reference to fig. 6, and the VCC power supply is a 5V power supply. Other components and connection relationships are the same as those in the second embodiment.
The specific implementation mode is eight: referring to fig. 6, the silicon steel sheet of the wind turbine generator with the supporting and fixing mechanism in the present embodiment is described, the model of the single chip microcomputer U1 is 51, the model of the display 102 is LCD1602, and the model of the temperature sensor 105 is DS18B 20. Other components and connection relationships are the same as those in the second embodiment.
Claims (8)
1. The utility model provides a aerogenerator silicon steel sheet with support fixed establishment which characterized in that: the temperature measuring device comprises a temperature measuring assembly, a plurality of groups of silicon steel sheets (3), a plurality of end buckles (1) and a plurality of ventilation supporting grooves (2); the ventilation supporting grooves (2) are strip-shaped shells, the cross section of each strip-shaped shell is trapezoidal, openings are processed at the upper bottom of each trapezoid, two barbs (4) are arranged at the openings of the upper bottom of each trapezoid, the openings of the two barbs (4) at the upper bottom of each trapezoid are arranged in a back-to-back manner, a plurality of groups of silicon steel sheets (3) are vertically arranged from top to bottom in sequence, a plurality of ventilation supporting grooves (2) are arranged between every two adjacent groups of silicon steel sheets (3), a plurality of groups of strip-shaped holes corresponding to the barbs (4) on the ventilation supporting grooves (2) are radially processed on each group of silicon steel sheets (3), the upper bottom of each ventilation supporting groove (2) is propped against the end faces of one group of silicon steel sheets (3), the barbs (4) on each ventilation supporting groove (2) penetrate through the corresponding strip-shaped holes on one group of silicon steel sheets (3) and hook onto the other end face of one group of silicon steel sheets (3), and a, the top of each end buckle (1) is fixedly connected with the lower end face of a group of silicon steel sheets (3) above, the bottom of each end buckle (1) is fixedly connected with the upper end face of a group of silicon steel sheets (3) below, and the temperature measuring assemblies are arranged on the end buckles (1).
2. The silicon steel sheet of the wind driven generator with the supporting and fixing mechanism as claimed in claim 1, wherein: the temperature measuring component comprises a display (102), a buzzer (103), a plurality of temperature sensors (105) and a temperature measuring circuit;
the temperature measuring circuit comprises a singlechip U1, a triode Q, VCC power supply, a slide rheostat R1, a resistor R2 and a resistor R3;
one end of a resistor R2 is connected with a VCC power supply, the other end of the resistor R2 is connected with the anode of a buzzer (103), the cathode of the buzzer (103) is connected with the collector of a triode Q, the base of the triode Q is connected with one end of a resistor R3, the emitter of the triode Q is grounded, the other end of the resistor R3 is connected with a pin P3.7 of a singlechip U1, pins P0.0, P0.1, P0.2, P0.3, P0.4, P0.5, P0.6 and P0.7 of the singlechip U1 are respectively connected with pins D0, D1, D2, D3, D4, D5, D6 and D7 of a display (102) in a one-to-one correspondence manner, pins PI.0, P1.1 and P1.2 of the singlechip U1 are respectively connected with a pin RS end, a RW end and an E end of the display (102) in one-to-one correspondence, the VSS end of the display (102), the VSS) end of the display (102) is connected with a plurality of the pins of the singlechip U3985, and the fixing ends of a plurality of a single chip microcomputer, the ground terminals of the plurality of temperature sensors (105) are grounded, and the VCC power supply is connected to the power terminals of the plurality of temperature sensors (105) and the moving terminal of the slide rheostat R1 at the same time.
3. The silicon steel sheet for the wind driven generator with the supporting and fixing mechanism according to claim 1 or 2, wherein: each temperature sensor (105) is mounted on top of an end clasp (1).
4. The silicon steel sheet of the wind driven generator with the supporting and fixing mechanism as claimed in claim 1, wherein: each group of silicon steel sheets (3) is formed by arranging a plurality of annular silicon steel sheets side by side, and each annular silicon steel sheet is formed by splicing a plurality of fan-shaped silicon steel sheets along the radial direction.
5. The silicon steel sheet of the wind driven generator with the supporting and fixing mechanism as claimed in claim 4, wherein: and a plurality of groups of supporting groove clamping openings are uniformly formed in each fan-shaped silicon steel sheet, each group of supporting groove clamping openings consists of two parallel supporting groove clamping openings, and the supporting groove clamping openings in each fan-shaped silicon steel sheet are arranged in a gradually expanding direction.
6. The silicon steel sheet for the wind driven generator with the supporting and fixing mechanism according to claim 1 or 4, wherein: the barb (4) on each ventilation supporting groove (2) respectively penetrates through the supporting groove clamping openings of the fan-shaped silicon steel sheets, and the barb (4) is hooked on the end face of the fan-shaped silicon steel sheet at the end part.
7. The silicon steel sheet of the wind driven generator with the supporting and fixing mechanism as claimed in claim 2, wherein: the VCC power supply is a 5V power supply.
8. The silicon steel sheet of the wind driven generator with the supporting and fixing mechanism as claimed in claim 2, wherein: the model of the single chip microcomputer U1 is 51, the model of the display (102) is LCD1602, and the model of the temperature sensor (105) is DS18B 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410571.2A CN112994285B (en) | 2021-04-13 | 2021-04-13 | Aerogenerator stator with support fixed establishment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110410571.2A CN112994285B (en) | 2021-04-13 | 2021-04-13 | Aerogenerator stator with support fixed establishment |
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| CN112994285A true CN112994285A (en) | 2021-06-18 |
| CN112994285B CN112994285B (en) | 2022-09-09 |
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| CN202110410571.2A Active CN112994285B (en) | 2021-04-13 | 2021-04-13 | Aerogenerator stator with support fixed establishment |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2385609A1 (en) * | 2010-05-05 | 2011-11-09 | Siemens Aktiengesellschaft | Generator with a segmented stator |
| CN103746481A (en) * | 2014-01-20 | 2014-04-23 | 东方电气集团东方电机有限公司 | Ventilating duct structure of stator core |
| CN204391917U (en) * | 2015-01-05 | 2015-06-10 | 绍兴市希多电机有限公司 | A kind of permanent magnetic disc type wind power generator stator |
| CN206099552U (en) * | 2016-10-24 | 2017-04-12 | 北京金风科创风电设备有限公司 | Ventilation frid, ventilation structure and motor |
| CN106655564A (en) * | 2016-12-23 | 2017-05-10 | 北京金风科创风电设备有限公司 | Stator core unit, stator, motor and wind generating set |
| CN207082918U (en) * | 2017-06-23 | 2018-03-09 | 杭州力源发电设备有限公司 | A kind of novel ventilated square steel structure of hydraulic generator stator |
| CN207732519U (en) * | 2017-12-22 | 2018-08-14 | 上海电气风电集团有限公司 | A kind of stator core structure and wind-driven generator |
| CN108512326A (en) * | 2018-05-30 | 2018-09-07 | 哈尔滨电气动力装备有限公司 | Armature ventilation channel plate for direct current generator |
| CN110429746A (en) * | 2019-08-30 | 2019-11-08 | 东方电气集团东方电机有限公司 | A kind of device with reduction major diameter electrical-coil and the iron core circumferential direction temperature difference |
| CN111756199A (en) * | 2020-08-03 | 2020-10-09 | 重庆水轮机厂有限责任公司 | Assembling process of stator ventilation slot plate of hydraulic generator |
| CN212323829U (en) * | 2020-05-08 | 2021-01-08 | 河北泰力电机制造有限公司 | High-power motor |
| CN112491203A (en) * | 2020-12-04 | 2021-03-12 | 中车永济电机有限公司 | Traction motor of motor train unit |
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2021
- 2021-04-13 CN CN202110410571.2A patent/CN112994285B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2385609A1 (en) * | 2010-05-05 | 2011-11-09 | Siemens Aktiengesellschaft | Generator with a segmented stator |
| CN103746481A (en) * | 2014-01-20 | 2014-04-23 | 东方电气集团东方电机有限公司 | Ventilating duct structure of stator core |
| CN204391917U (en) * | 2015-01-05 | 2015-06-10 | 绍兴市希多电机有限公司 | A kind of permanent magnetic disc type wind power generator stator |
| CN206099552U (en) * | 2016-10-24 | 2017-04-12 | 北京金风科创风电设备有限公司 | Ventilation frid, ventilation structure and motor |
| CN106655564A (en) * | 2016-12-23 | 2017-05-10 | 北京金风科创风电设备有限公司 | Stator core unit, stator, motor and wind generating set |
| CN207082918U (en) * | 2017-06-23 | 2018-03-09 | 杭州力源发电设备有限公司 | A kind of novel ventilated square steel structure of hydraulic generator stator |
| CN207732519U (en) * | 2017-12-22 | 2018-08-14 | 上海电气风电集团有限公司 | A kind of stator core structure and wind-driven generator |
| CN108512326A (en) * | 2018-05-30 | 2018-09-07 | 哈尔滨电气动力装备有限公司 | Armature ventilation channel plate for direct current generator |
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| CN212323829U (en) * | 2020-05-08 | 2021-01-08 | 河北泰力电机制造有限公司 | High-power motor |
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| CN112491203A (en) * | 2020-12-04 | 2021-03-12 | 中车永济电机有限公司 | Traction motor of motor train unit |
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| CN112994285B (en) | 2022-09-09 |
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