CN112713712A - Direct drive motor of oil field winch - Google Patents
Direct drive motor of oil field winch Download PDFInfo
- Publication number
- CN112713712A CN112713712A CN202011462470.1A CN202011462470A CN112713712A CN 112713712 A CN112713712 A CN 112713712A CN 202011462470 A CN202011462470 A CN 202011462470A CN 112713712 A CN112713712 A CN 112713712A
- Authority
- CN
- China
- Prior art keywords
- fan
- motor
- stator
- drive motor
- rotor
- 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
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- H02K1/32—Rotating 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
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to a motor for an oil field winch, in particular to a direct drive motor for the oil field winch. The motor is provided with the axial ventilation hole structures on the rotor punching sheet and the plane of the front end cover, and the axial ventilation capacity of the rotor can be effectively enhanced by matching the fan at the top of the base, the air inlet and the air outlet of the fan and the air outlet structure outside the front end cover, so that the forced air cooling heat dissipation capacity of the motor is greatly enhanced, and the temperature rise of the motor is effectively controlled within a reliable range. The punching sheet adopts a fan-shaped sheet structure, 8 fan-shaped punching sheets are spliced into a whole circle, and raw materials of the stator punching sheet can be saved; in order to ensure the mechanical strength and stability of the stator core structure, a certain angle is staggered between adjacent full-circle stator punching sheets; the stator and rotor slot matching is 144/160, the pole number is 12, and simulation analysis shows that the structure can increase the outer diameter of the stator, shorten the length of the iron core, reduce the overall electromagnetic load of the motor and effectively improve the torque density of the motor under the condition of ensuring that the volume is basically unchanged.
Description
Technical Field
The invention relates to a motor for an oil field winch, in particular to a direct drive motor for the oil field winch.
Background
The oil field winch is a key device in a lifting system of an oil drilling machine, and is responsible for a series of tasks such as lifting and lowering a drilling tool and a derrick, feeding drilling speed, processing complex accidents in the well and the like, so that whether an important transmission part can work safely and stably is a precondition for ensuring the normal operation of the whole drilling process. With the increasing of drilling difficulty and depth in oil exploration and development work, the requirements of a winch with high power and high performance are increased, and the modern drilling process has higher requirements on the novel winch. The alternating-current variable-frequency drilling machine winch has the advantages that the mechanical structure is simplified, the transmission efficiency is improved, the control on the torque and the speed of the roller is easy to realize, the drilling automation is favorably improved, and the alternating-current variable-frequency drilling machine winch becomes the main type and the development direction of the winch equipped for high-performance large-scale drilling machines at home and abroad.
The existing oilfield winch gradually adopts a variable-frequency speed-regulating asynchronous direct-drive motor to directly drive a winch drum, so that a speed reducer of the traditional winch is omitted, and the winch drum is directly electrically driven, which is an inevitable choice for technical development. Compared with a common variable-frequency variable-speed asynchronous motor, the variable-frequency variable-speed asynchronous direct-drive motor for the oilfield winch can generate a large amount of heat in the use process, and has high requirements on the torque density and the heat dissipation of the motor, and the conventional common asynchronous motor or low-speed asynchronous motor cannot well meet the technical requirements in the aspect.
In an invention patent of an explosion-proof variable-frequency speed-regulating asynchronous motor with the publication number of CN 103486073A, the invention provides an explosion-proof variable-frequency speed-regulating asynchronous motor, which comprises a shell 9, a rotating shaft 1, a rotor 3, a stator 4, a front end cover 7, a rear end cover 2 and a cooling fan 10; the cooling fan 10 comprises a fan motor, fan blades, a fan blade shell, a ventilating funnel and a ventilating hood, wherein the fan blades are installed at one end of the fan motor, the fan blade shell is installed on the fan motor and arranged on the outer side of the fan blades, one end of the ventilating funnel is communicated with the fan blade shell, the other end of the ventilating funnel is communicated with the ventilating hood, and the ventilating hood is communicated with the inside of the machine shell.
As shown in fig. 4, the main heat dissipation path of the explosion-proof variable-frequency speed-regulating asynchronous motor is to forcibly discharge hot air in the motor from the motor shell through the ventilation hood and the ventilation duct by the fan, and the motor integrally adopts a sealing structure, so that under the condition of continuous and complicated working conditions and long-time operation, the heat dissipation effect of the motor is general, and the temperature rise of the motor cannot be completely and effectively inhibited.
Disclosure of Invention
The invention provides a direct drive motor of an oilfield winch, aiming at the problems that under the condition of continuous complex working conditions and long-time operation, the heat dissipation effect of a motor is general, and the temperature rise of the motor cannot be completely and effectively inhibited.
The invention is realized by adopting the following technical scheme: the utility model provides an oil field winch directly drives motor, includes pivot, rear end cap, rotor, stator, fan, frame, front end housing and goes out the fan housing, and the fan is installed on the frame, and the mounted position is located rear end cap department on the frame, goes out the fan housing and installs in the outside of front end housing, and it has the ventilation hole to open on the front end housing. The air outlet structure of motor has been optimized to this scheme for the motor has increased a plurality of vents outside the business turn over wind gap of frame, can improve the heat-sinking capability of motor by a wide margin.
Foretell oil field winch directly drives motor, goes out the fan housing and goes out the air from fan housing both sides and bottom, and both sides air outlet adopts the shutter structure, and the bottom air outlet adopts the wire net structure. The air outlet cover is provided with three air outlets, so that the heat dissipation capacity of the motor is greatly improved.
According to the direct drive motor for the oilfield winch, the stator punching sheet is of a fan-shaped sheet structure, 8 fan-shaped punching sheets are spliced into a whole circle, and raw materials of the stator punching sheet can be saved.
The direct drive motor of the oilfield winch is characterized in that adjacent round stator punching sheets are staggered by 22.5 degrees, and the mechanical strength and the stability of a stator core structure are guaranteed.
The direct drive motor of the oilfield winch is characterized in that the rotor punching sheet is pressed in a whole circle in a laminated mode, a trapezoidal groove is formed in the outer circumference of the rotor punching sheet, and the punching sheet is further provided with an axial ventilation hole.
According to the direct-drive motor for the oilfield winch, each fan-shaped piece is provided with two pull plate grooves, the stator core is integrally formed by welding 16 pull plates and stator pressing rings at two ends, the matching of the stator core grooves and the rotor core grooves is 144/160, and the number of poles is 12. Through simulation analysis, the structure is found to increase the outer diameter of the stator, shorten the length of the iron core, reduce the overall electromagnetic load of the motor and effectively improve the torque density of the motor under the condition of ensuring that the volume is basically unchanged.
According to the direct-drive motor for the oilfield winch, the rotor is of a conducting bar and end ring welding structure, the rotor core and the rotating shaft are of a spoke shaft support structure, the spoke shaft and the rotating shaft are connected through the interference heat sleeve, and the baffle and the ring key structure are adopted for axial positioning.
The oil field winch direct drive motor is characterized in that the air outlet cover is welded by thin steel plates and is welded by support columns.
The direct drive motor of the oilfield winch has the advantages that the fans can be replaced by the two low-power fans, and noise is reduced.
The technical scheme of the invention has the following beneficial effects:
in the invention, the punching sheet adopts a fan-shaped sheet structure, 8 fan-shaped punching sheets are spliced into a whole circle, and raw materials of the stator punching sheet can be saved; in order to ensure the mechanical strength and stability of the stator core structure, a certain angle is staggered between adjacent full-circle stator punching sheets; the stator and rotor slot matching is 144/160, the pole number is 12, and simulation analysis shows that the structure can increase the outer diameter of the stator, shorten the length of the iron core, reduce the overall electromagnetic load of the motor and effectively improve the torque density of the motor under the condition of ensuring that the volume is basically unchanged.
In the invention, the axial ventilation hole structures are arranged on the rotor punching sheet and the plane of the front end cover, and the axial ventilation capacity of the rotor can be effectively enhanced by matching the fan at the top of the base, the air inlet and outlet of the fan and the air outlet structure outside the front end cover, so that the forced air cooling heat dissipation capacity of the motor is greatly enhanced, and the temperature rise of the motor is effectively controlled within a reliable range.
According to the invention, the air outlet cover component is arranged outside the front end cover, air can be exhausted from two sides and the bottom of the air outlet cover, the air outlet structure of the motor is optimized, and the heat dissipation capability of the motor is greatly improved on the basis of ensuring the explosion-proof performance requirement of the motor.
Drawings
FIG. 1 is a structural diagram of a direct drive motor of the oilfield winch.
Fig. 2 is a schematic structural diagram of a rotor sheet.
Fig. 3 is a front end cap structure view.
Fig. 4 is a structural diagram of an existing explosion-proof variable-frequency speed-regulating asynchronous motor.
In the figure: 1-rotating shaft, 2-rear end cover, 3-rotor, 4-stator, 5-fan, 6-base, 7-front end cover, 8-air outlet cover, 9-machine shell and 10-cooling fan.
Detailed Description
The invention provides a direct drive motor of an oilfield winch, which mainly comprises a rotating shaft 1, a rear end cover 2, a rotor 3, a stator 4, a fan 5, a machine base 6, a front end cover 7 and an air outlet cover 8. As shown in fig. 2, the rotor 3 adopts a radial shaft support structure, and the rotor punching sheet adopts a circular sheet structure, so that raw materials of the rotor punching sheet can be saved, and the requirement of large diameter of the rotor can be met; the stator core 4 adopts a sector punching sheet with the outer diameter of 1480mm, the raw material of the stator punching sheet can be saved, the stator and rotor slots are matched with 144/160, the pole number is 12, the outer diameter of the stator is increased under the condition of ensuring that the volume is basically unchanged, the length of the core is shortened, the overall electromagnetic load is low, and the torque density of the motor can be effectively improved; the front end cover 7 is externally provided with an air outlet cover 8 component which is fastened with the support column through an inner hexagon bolt, and the structure optimizes the air outlet structure of the motor, so that the motor is additionally provided with a plurality of ventilation openings outside the air inlet and outlet at the top, and the heat dissipation capacity of the motor can be greatly improved.
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the direct-drive motor of the oilfield winch is composed of a rotating shaft 1, a rear end cover 2, a rotor 3, a stator 4, a fan 5, a base 6, a front end cover 7 and an air outlet cover 8, and is supported by double bearings in a horizontal structure.
The stator structure mainly comprises a stator core and a coil. The stator punching sheet is of a fan-shaped sheet structure, 8 fan-shaped punching sheets are spliced into a whole circle, and raw materials of the stator punching sheet can be saved. In order to ensure the mechanical strength and the stability of the stator core structure, 22.5 degrees are staggered between adjacent full-circle stator punching sheets. Each segment is provided with two pull plate grooves, and the iron core is integrally formed by welding 16 pull plates and stator pressing rings at two ends. The stator core slot and the rotor core slot are combined into 144/160, and the number of poles is 12. Through simulation analysis, the structure is found to increase the outer diameter of the stator, shorten the length of the iron core, reduce the overall electromagnetic load of the motor and effectively improve the torque density of the motor under the condition of ensuring that the volume is basically unchanged.
The rotor structure adopts a guide bar and end ring welding structure, a spoke shaft support structure is adopted between a rotor punching sheet and a rotating shaft, an interference shrink fit is adopted between a spoke shaft and the rotating shaft for connection, and a baffle and a ring key structure are adopted for axial positioning. The rotor punching sheet is in a full circle overlying mode, a trapezoid groove structure is adopted on the outer circumferential surface of the punching sheet, the punching sheet is provided with an axial ventilation hole structure, 60 circular ventilation holes are uniformly distributed in the surface of one punching sheet, the axial ventilation capacity of the rotor is effectively enhanced, and the temperature rise of the rotor can be greatly reduced by matching a fan at the top of the base with the ventilation holes in the plane of the front end cover and an air outlet cover structure outside the front end cover as shown in fig. 3.
An air outlet cover 8 is arranged outside the front end cover 7, the air outlet cover 8 and the front end cover 7 are fastened through a support column by using hexagon socket head cap bolts, and the end cover threads are arranged at the center of the rib plate. The air outlet cover 8 is welded by thin steel plates and is welded by support columns. The air outlet cover structure is used for exhausting air from two sides and the bottom of the air outlet cover, air outlets on two sides are of shutter structures, and air outlets on the bottom are of steel wire mesh structures. The air outlet structure of the motor can be optimized by the air outlet cover component, so that the motor is provided with three ventilation openings outside the air inlet and the air outlet of the top fan assembly, and the heat dissipation capacity of the motor is greatly improved on the basis of ensuring the explosion-proof performance requirement of the motor.
Claims (9)
1. The utility model provides an oil field winch directly drives motor, includes pivot (1), rear end cap (2), rotor (3), stator (4), fan (5), frame (6), front end housing (7) and goes out fan housing (8), its characterized in that: the fan (5) is arranged on the base (6), the mounting position of the fan is positioned on the rear end cover of the base (6), the air outlet cover (8) is arranged on the outer side of the front end cover (7), and the front end cover (7) is provided with a ventilation hole.
2. The oilfield winch direct drive motor of claim 1, wherein: the air outlet cover (8) is used for exhausting air from two sides and the bottom of the air outlet cover, air outlets on two sides are of shutter structures, and air outlets on the bottom are of steel wire mesh structures.
3. The oilfield winch direct drive motor of claim 2, wherein: the stator punching sheet adopts a fan-shaped sheet structure, 8 fan-shaped punching sheets are spliced into a whole circle, and raw materials of the stator punching sheet are saved.
4. The oilfield winch direct drive motor of claim 3, wherein: and 22.5 degrees of staggering is formed between every two adjacent full-circle stator punching sheets, so that the mechanical strength and the stability of the stator core structure are ensured.
5. The oilfield winch direct drive motor of claim 4, wherein: the rotor punching sheet is pressed in a whole circle in a laminating mode, a trapezoidal groove is formed in the outer circumference of the rotor punching sheet, and the punching sheet is further provided with an axial ventilation hole.
6. The oilfield winch direct drive motor of claim 5, wherein: two pulling plate slots are arranged on each fan-shaped sheet, the whole stator core is formed by welding 16 pulling plates and stator pressing rings at two ends, the matching of the stator core slots and the rotor core slots is 144/160, and the number of poles is 12.
7. The oilfield drawworks direct drive motor of claim 1, 2, 3, 4, 5, or 6, wherein: the rotor (3) adopts a guide bar and end ring welding structure, a spoke shaft support structure is adopted between a rotor iron core and the rotating shaft (1), the spoke shaft and the rotating shaft (1) are connected by an interference hot sleeve, and a baffle and a ring key structure are adopted for axial positioning.
8. The oilfield drawworks direct drive motor of claim 1, 2, 3, 4, 5, or 6, wherein: the air outlet cover (8) is welded by thin steel plates and is welded by support columns.
9. The oilfield drawworks direct drive motor of claim 1, 2, 3, 4, 5, or 6, wherein: the fan (5) can be replaced by two low-power fans.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462470.1A CN112713712A (en) | 2020-12-14 | 2020-12-14 | Direct drive motor of oil field winch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011462470.1A CN112713712A (en) | 2020-12-14 | 2020-12-14 | Direct drive motor of oil field winch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112713712A true CN112713712A (en) | 2021-04-27 |
Family
ID=75541816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011462470.1A Pending CN112713712A (en) | 2020-12-14 | 2020-12-14 | Direct drive motor of oil field winch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112713712A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400810A (en) * | 2021-12-30 | 2022-04-26 | 中车永济电机有限公司 | Rotor sealing structure of forced ventilation cooling type permanent magnet synchronous motor |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0865928A (en) * | 1994-08-23 | 1996-03-08 | Hitachi Ltd | Rotating electric machine |
| JP2000308302A (en) * | 1999-04-20 | 2000-11-02 | Kokusan Denki Co Ltd | Rotating electric machine |
| CN1866690A (en) * | 2006-06-12 | 2006-11-22 | 中国北车集团永济电机厂 | Low-speed big-diameter high-torque asynchronous motor |
| CN201226483Y (en) * | 2008-06-04 | 2009-04-22 | 天津神川机电有限公司 | Rotor structure for high-power variable-frequency control three-phase asynchronous motor |
| EP2605380A2 (en) * | 2011-12-15 | 2013-06-19 | Hitachi Ltd. | Rotating electric machine, rail vehicle and electric vehicle equipped therewith |
| CN204669158U (en) * | 2015-05-13 | 2015-09-23 | 长沙电机厂有限责任公司 | Cooling devcie of motor and the dynamometer machine with this cooling devcie of motor |
| CN106059165A (en) * | 2016-08-15 | 2016-10-26 | 中车永济电机有限公司 | Increased-safety explosion-proof type frequency-conversion speed regulation asynchronous motor for petroleum drilling winch |
| CN207265746U (en) * | 2017-08-31 | 2018-04-20 | 重庆赛力盟电机有限责任公司 | The groove fit structure of rotor |
| CN208939719U (en) * | 2018-08-29 | 2019-06-04 | 四川宏华电气有限责任公司 | A kind of New-type electric machine outlet housing |
| CN110535301A (en) * | 2019-08-26 | 2019-12-03 | 青岛海西电气有限公司 | Segmental punching chute stator iron core laminating tooling and stator core laminating method |
-
2020
- 2020-12-14 CN CN202011462470.1A patent/CN112713712A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0865928A (en) * | 1994-08-23 | 1996-03-08 | Hitachi Ltd | Rotating electric machine |
| JP2000308302A (en) * | 1999-04-20 | 2000-11-02 | Kokusan Denki Co Ltd | Rotating electric machine |
| CN1866690A (en) * | 2006-06-12 | 2006-11-22 | 中国北车集团永济电机厂 | Low-speed big-diameter high-torque asynchronous motor |
| CN201226483Y (en) * | 2008-06-04 | 2009-04-22 | 天津神川机电有限公司 | Rotor structure for high-power variable-frequency control three-phase asynchronous motor |
| EP2605380A2 (en) * | 2011-12-15 | 2013-06-19 | Hitachi Ltd. | Rotating electric machine, rail vehicle and electric vehicle equipped therewith |
| CN204669158U (en) * | 2015-05-13 | 2015-09-23 | 长沙电机厂有限责任公司 | Cooling devcie of motor and the dynamometer machine with this cooling devcie of motor |
| CN106059165A (en) * | 2016-08-15 | 2016-10-26 | 中车永济电机有限公司 | Increased-safety explosion-proof type frequency-conversion speed regulation asynchronous motor for petroleum drilling winch |
| CN207265746U (en) * | 2017-08-31 | 2018-04-20 | 重庆赛力盟电机有限责任公司 | The groove fit structure of rotor |
| CN208939719U (en) * | 2018-08-29 | 2019-06-04 | 四川宏华电气有限责任公司 | A kind of New-type electric machine outlet housing |
| CN110535301A (en) * | 2019-08-26 | 2019-12-03 | 青岛海西电气有限公司 | Segmental punching chute stator iron core laminating tooling and stator core laminating method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114400810A (en) * | 2021-12-30 | 2022-04-26 | 中车永济电机有限公司 | Rotor sealing structure of forced ventilation cooling type permanent magnet synchronous motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201393138Y (en) | Water pump motor with three-dimensional heat radiating structure | |
| CN108667213B (en) | Follow-up heat dissipation shock attenuation motor | |
| CN203896114U (en) | Ventilation heat radiating and end surface assembling structure of motor | |
| CN112713712A (en) | Direct drive motor of oil field winch | |
| CN111224488B (en) | Rotor of permanent magnet synchronous motor | |
| CN201576969U (en) | Motor rotor structure | |
| CN201341046Y (en) | Ventilation structure of direct current motor | |
| CN101267141A (en) | Vertical water wheel power generator no fan ventilation cooling device | |
| CN202997839U (en) | Optimized structure of universal motor ventilation system | |
| CN217010615U (en) | Outer rotor air-cooled permanent magnet motor | |
| CN203604104U (en) | Novel water turbine for cooling tower | |
| CN204794410U (en) | Motor rotor structure with ventilation cooling efficiency | |
| CN201215914Y (en) | Wind circulation cooling construction in motor | |
| CN219643740U (en) | Permanent magnet synchronous motor with quick heat dissipation function | |
| CN220605693U (en) | Motor without shell | |
| CN218958723U (en) | Switch reluctance motor with air cooling function | |
| CN217102620U (en) | Self-air-cooling permanent magnet synchronous traction machine | |
| CN204089477U (en) | Axle and the two cooling motor of stator | |
| CN215871028U (en) | Efficient air cooling structure applied to motor | |
| CN210074780U (en) | Reactive power compensation controller | |
| CN216086292U (en) | Motor rotor with heat radiation structure | |
| CN215719208U (en) | Novel vertical shaft of wind driven generator | |
| CN219145193U (en) | Permanent magnet synchronous motor | |
| CN215186218U (en) | Low temperature rise motor | |
| CN210167929U (en) | Outer rotor motor of chain scraper conveyor |
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 |
Application publication date: 20210427 |
|
| RJ01 | Rejection of invention patent application after publication |