CN217469693U - Electric valve and alternating current asynchronous motor thereof - Google Patents
Electric valve and alternating current asynchronous motor thereof Download PDFInfo
- Publication number
- CN217469693U CN217469693U CN202220588631.XU CN202220588631U CN217469693U CN 217469693 U CN217469693 U CN 217469693U CN 202220588631 U CN202220588631 U CN 202220588631U CN 217469693 U CN217469693 U CN 217469693U
- Authority
- CN
- China
- Prior art keywords
- asynchronous motor
- alternating current
- valve
- housing
- rear end
- 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.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
-
- 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
- H02K11/21—Devices for sensing speed or position, or actuated thereby
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
An electric valve and an ac asynchronous motor thereof, the electric valve comprising a valve, a transmission, an ac asynchronous motor and a driver, the ac asynchronous motor being connected to the valve through the transmission, the driver being connected to the ac asynchronous motor and controlling opening and closing of the valve through the ac asynchronous motor, the ac asynchronous motor comprising: a housing; a rear end cap mounted at a rear end of the housing; a stator mounted within the housing; a rotor installed in the housing corresponding to the stator and supported on the housing by a motor shaft; and the position sensor is arranged in the rear end cover and is connected with the tail end of the motor shaft. The utility model discloses can match different control modes according to the position signal of the different working phases of ooff valve process division, realize exchanging asynchronous motor's output position, speed and the accurate control of moment of torsion.
Description
Technical Field
The utility model relates to an electrically operated valve and drive arrangement thereof, especially an electrically operated valve and exchange asynchronous motor thereof.
Background
The valve electric device in the prior art adopts a power supply to directly start an alternating current asynchronous motor, and the motor drives a mechanical transmission mechanism to drive a valve to operate so as to realize valve opening/closing. The alternating current asynchronous motor has the advantages of simple structure, reliable operation, light weight, low price, larger starting torque and the like, and is widely applied to electric devices, but in the using process, the rotating speed of the alternating current asynchronous motor is fixed in the operation process of the valve, the valve opening/closing speed is unchanged, and the dynamic load of the valve seat is easily overloaded when the valve is closed to a stop point, so that the valve cannot be opened after being closed tightly. Dynamic load overload can also accelerate the abrasion of a sealing surface of the valve and reduce the service life of the valve. The torque control precision of the AC asynchronous motor for closing and opening the valve is low, and the driving torque can not overcome all resistance torque when the valve is opened due to the influence of medium temperature, foreign matters, corrosion and other factors, so that the valve can not be opened. The fixed rotating speed can not meet the requirement of rapidly opening/closing the valve at emergency time, and can not meet the requirement of speed regulation operation of the valve under the working condition of 'water hammer'. Therefore, the networked centralized remote control with high reliability and strong anti-interference performance cannot be realized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the above-mentioned defect of prior art, provide an electric valve and exchange asynchronous motor thereof.
In order to achieve the above object, the present invention provides an alternating current asynchronous motor, wherein, including:
a housing;
a rear end cap mounted at a rear end of the housing;
a stator mounted within the housing;
a rotor installed in the housing corresponding to the stator and supported on the housing by a motor shaft; and
and the position sensor is arranged in the rear end cover and is connected with the tail end of the motor shaft.
The above ac asynchronous motor, wherein said housing comprises:
the stator is arranged on the shell and is in a hollow cylindrical structure;
the front end flange is positioned at the front end of the shell and is provided with a front bearing hole and a front end connecting structure;
the motor shaft is supported and installed on the front end flange and the tail end flange through a front bearing and a rear bearing respectively, and the front bearing and the rear bearing are installed in the front bearing hole and the rear bearing hole correspondingly; and
and the fixed seat is arranged on one side of the shell.
In the above alternating current asynchronous motor, the housing is an integral structure, and the outer surface of the casing is uniformly provided with a plurality of cooling fins.
In the above alternating current asynchronous motor, the rear end cover is mounted on the rear end flange, the rear end cover is further provided with a connection interface for connecting with an external driving device or a calibration device, and a center line of the connection interface and an axis of the motor shaft are located on the same straight line.
The above ac asynchronous motor, wherein the position sensor comprises:
an upper cover;
the lower cover is buckled with the upper cover to form an accommodating space;
the sensor is arranged in the accommodating space;
one end of the sensor shaft is connected with the sensor;
the driving shaft sleeve is positioned in the accommodating space and is arranged and supported on the upper cover and the lower cover, and one end of the driving shaft sleeve is connected with the tail end of the motor shaft; and
and the transmission wheel pair is positioned in the accommodating space, a driving wheel of the transmission wheel pair is connected with the driving shaft sleeve, and a driven wheel of the transmission wheel pair is connected with the other end of the sensor shaft.
In the above ac asynchronous motor, the transmission wheel pair is a gear transmission pair, a synchronous pulley transmission pair or a magnetic transmission wheel pair.
In the above ac asynchronous motor, the sensor is an absolute encoder, a relative encoder, or a resolver.
In the above ac asynchronous motor, the driving wheel of the driving wheel pair is connected to the middle of the driving shaft sleeve by key connection, interference fit or jackscrew fixation.
In the above ac asynchronous motor, the sensor is fixed to the upper cover, and the upper cover is mounted to the tail end flange by a fastener.
In order to better achieve the above object, the present invention further provides an electric valve, which includes a valve, a transmission, an ac asynchronous motor, and a driver, wherein the ac asynchronous motor is connected to the valve through the transmission, and the driver is connected to the ac asynchronous motor and controls the opening and closing of the valve through the ac asynchronous motor, and the ac asynchronous motor is the above ac asynchronous motor.
The utility model has the beneficial effects that:
the utility model discloses can change according to the full stroke load of ooff valve, according to the full stroke load of ooff valve change, through optimizing the matching parameter of speed and moment of torsion, realize the accurate control of output position, speed and moment of torsion of alternating current asynchronous motor, the rated specification of alternating current asynchronous motor is little, and then can reduce the total volume and the weight and reduce cost of product, has improved the dynamic characteristic of electric valve pipe-line system; the smoothness control of the dragging load of the alternating current asynchronous motor is improved, and the current impact on a power grid is reduced.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
Drawings
Fig. 1 is a schematic structural view of an electric valve according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ac asynchronous motor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a housing according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a position sensor according to an embodiment of the present invention;
fig. 5 is a schematic view of a position sensor according to an embodiment of the present invention;
fig. 6A-6C are schematic structural views of the rear end cap of the present invention, respectively.
Wherein the reference numerals
1 valve
2 drive unit
21 driving flange
3 AC asynchronous motor
31 outer casing
311 casing
312 Heat sink
313 fixed seat
314 front end flange
315 tail end flange
32 electric motor shaft
33 stator
34 rotor
35 rear end cap
351 connection interface
36 front bearing
37 rear bearing
38 position sensor
381 Upper cover
382 lower cover
383 sensor
384 sensor shaft
385 driving wheel pair
386 bearing
387 drive bushing
4 driver
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
referring to fig. 1, fig. 1 is a schematic structural diagram of an electric valve 1 according to an embodiment of the present invention. The utility model discloses an electric valve 1, including valve 1, transmission 2, exchange asynchronous motor 3 and driver 4, exchange asynchronous motor 3 and pass through transmission 2 with valve 1 is connected, driver 4 with exchange asynchronous motor 3 and connect, and pass through exchange asynchronous motor 3 control the switching of valve 1. The ac asynchronous motor 3 is positioned with the driving flange 21 of the driving device 2 by the front end flange 314 and can be fixed by bolting. A motor shaft 32 of the alternating current asynchronous motor 3 can be connected with an input shaft of the transmission device 2 through a key, the alternating current asynchronous motor 3 provides driving power for the transmission device 2, the alternating current asynchronous motor 3 receives an instruction of the driver 4, motor torque is transmitted to the transmission device 2 through the motor shaft 32, and the transmission device 2 drives a valve rod of the valve 1 to perform opening or closing actions after being decelerated. The composition, structure, mutual position relation, connection relation and theory of operation etc. of this electric valve 1 other parts are more mature prior art, so no longer give unnecessary details here, only are right below the utility model discloses an exchange asynchronous motor 3 gives detailed description.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an ac asynchronous motor 3 according to an embodiment of the present invention. The utility model discloses an exchange asynchronous motor 3, include: a housing 31; a rear end cap 35 mounted on a rear end of the housing 31; a stator 33 installed in the housing 31, which generates a rotating magnetic field by kinetic energy from three-phase alternating current of the driver 4; a rotor 34 installed in the housing 31 corresponding to the stator 33 and supported on the housing 31 by a motor shaft 32, the rotor 34 being concentric with the stator 33 and rotating with a rotating magnetic field to generate a rotating power, and both the front end and the rear end of the motor shaft 32 can adopt a key groove structure or a spline structure; and a position sensor 38 installed in the rear end cover 35 and connected to the rear end of the motor shaft 32, wherein the position sensor 38 is used for monitoring the angular displacement of the ac asynchronous motor 3 and transmitting an angular displacement signal to the driver 4.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a housing 31 according to an embodiment of the present invention. The housing 31 of the present embodiment includes: the housing 311 is a hollow cylindrical structure, and the stator 33 is fixedly mounted on the housing 311; the front end flange 314 is positioned at the front end of the shell 311, the front end flange 314 is provided with a front bearing 36 hole and a front end connecting structure, and the front end connecting structure can be a threaded hole and is used for realizing connection and fixation with the transmission device 2 of the electric valve 1; a tail end flange 315 located at the rear end of the housing 311, the tail end flange 315 being provided with a rear bearing 37 hole and a rear end connection structure, the rear end connection structure being a threaded hole for fixing the rear end cover 35, the motor shaft 32 being supported and mounted on the front end flange 314 and the tail end flange 315 through a front bearing 36 and a rear bearing 37, the front bearing 36 and the rear bearing 37 being correspondingly mounted in the front bearing 36 hole and the rear bearing 37 hole, respectively; and a fixing seat 313 arranged at one side of the housing 311 for connecting and fixing the driver 4 or the junction box, wherein a driving cable and a communication cable of the motor pass through the fixing seat 313 to be connected with the driver 4 or the junction box. The shell 31 is preferably an integral structure, the outer surface of the shell 311 may further be uniformly provided with a plurality of cooling fins 312, and the cooling fins 312 may be a plurality of annular protruding structures on the shell 311, and are mainly used for increasing the heat dissipation area of the shell 311 and improving the heat dissipation effect.
Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of a position sensor 38 according to an embodiment of the present invention, and fig. 5 is a schematic installation diagram of the position sensor 38 according to an embodiment of the present invention. The position sensor 38 of the present embodiment is mounted in the rear end cover 35, and includes: an upper cover 381; the lower cover 382 is buckled with the upper cover 381 to form an accommodating space; a sensor 383 disposed in the accommodating space; a sensor shaft 384 having one end connected to the sensor 383; a driving shaft sleeve 387 which is located in the accommodating space and is mounted and supported on the upper cover 381 and the lower cover 382 through a bearing 386, and one end of the driving shaft sleeve 387 is connected with the tail end of the motor shaft 32; and the transmission wheel set 385 is positioned in the accommodating space, a driving wheel of the transmission wheel set 385 is connected with the driving shaft sleeve 387, and a driven wheel of the transmission wheel set 385 is connected with the other end of the sensor shaft 384. Wherein, the transmission wheel set 385 can be a gear transmission set, a synchronous pulley transmission set or a magnetic transmission wheel set. The sensor 383 can be an absolute encoder, a relative encoder or a rotary transformer, the sensor 383 is preferably fixed on the upper cover 381, and the lower cover 382 can be mounted on the tail flange 315 by fasteners. The driving wheel of the driving wheel set 385 in this embodiment may be connected to the middle of the driving sleeve 387 by key connection, interference fit, or jackscrew fixation.
Referring to fig. 6A-6C, fig. 6A-6C are schematic structural views of the rear end cap 35 of the present invention, respectively. The rear end cover 35 is mounted on the rear end flange 315 and fixed by bolts, a cavity is formed between the rear end cover 35 and the housing 311, a driving hole may be left in the center of the rear end cover 35, a connection interface 351 for connecting with an external driving device or a calibration device may also be provided, and the center line of the connection interface 351 and the axis of the motor shaft 32 are located on the same straight line. The connection interface 351 may be a pin connection, a spline connection, a bolt connection, or the like, wherein the connection interface 351 of fig. 6A is configured in the pin connection, the connection interface 351 of fig. 6B is configured in the spline connection, and the connection interface 351 of fig. 6C is configured in the bolt connection.
When the valve 1 needs to be closed, the alternating current asynchronous motor 3 is powered on, the speed is accelerated to a set idle speed at the maximum acceleration by adopting a speed priority strategy, the set idle speed is preferably the over-frequency speed of the motor, the idle speed operation is maintained, when the position sensor 38 detects that the deceleration position is in place, the motor decelerates to a set approaching speed, the approaching speed is maintained, the torque priority strategy is adopted, the motor operates according to the set torque until the driver 4 detects that the set torque is reached, the alternating current asynchronous motor 3 is powered off after the set torque is maintained for a set time, and the closing of the valve 1 is completed. When the valve 1 needs to be opened, the alternating current asynchronous motor 3 is powered on, a torque priority strategy is adopted to start with set torque, after the position sensor 38 detects that the valve 1 moves, a speed priority strategy is adopted to accelerate to a set no-load speed with maximum acceleration, the set no-load speed is preferably the over-frequency speed of a motor, the no-load speed operation is maintained, after the position sensor 38 detects that a deceleration position is in place, the motor decelerates and stops with maximum deceleration, and the opening of the valve 1 is completed.
Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.
Claims (10)
1. An alternating current asynchronous motor, comprising:
a housing;
a rear end cap mounted at a rear end of the housing;
a stator mounted within the housing;
a rotor installed in the housing corresponding to the stator and supported on the housing by a motor shaft; and
and the position sensor is arranged in the rear end cover and is connected with the tail end of the motor shaft.
2. An alternating current asynchronous motor according to claim 1, characterized in that said casing comprises:
the stator is arranged on the shell and is in a hollow cylindrical structure;
the front end flange is positioned at the front end of the shell and is provided with a front bearing hole and a front end connecting structure;
the motor shaft is supported and installed on the front end flange and the tail end flange through a front bearing and a rear bearing respectively, and the front bearing and the rear bearing are installed in the front bearing hole and the rear bearing hole respectively and correspondingly; and
and the fixed seat is arranged on one side of the shell.
3. An ac asynchronous motor according to claim 2, characterized in that said casing is a unitary structural element, said casing being provided on its outer surface with a plurality of fins.
4. An alternating current asynchronous motor according to claim 3, wherein said rear end cap is mounted on said rear end flange, said rear end cap further being provided with a connection interface for connection with an external drive device or a calibration device, the center line of said connection interface being aligned with the axis of said motor shaft.
5. An alternating current asynchronous motor according to claim 2, 3 or 4, characterized in that said position sensor comprises:
an upper cover;
the lower cover is buckled with the upper cover to form an accommodating space;
the sensor is arranged in the accommodating space;
one end of the sensor shaft is connected with the sensor;
the driving shaft sleeve is positioned in the accommodating space and is arranged and supported on the upper cover and the lower cover, and one end of the driving shaft sleeve is connected with the tail end of the motor shaft; and
and the transmission wheel pair is positioned in the accommodating space, a driving wheel of the transmission wheel pair is connected with the driving shaft sleeve, and a driven wheel of the transmission wheel pair is connected with the other end of the sensor shaft.
6. An alternating current asynchronous motor according to claim 5, characterized in that said transmission wheel set is a gear transmission set, a synchronous pulley transmission set or a magnetic transmission wheel set.
7. An alternating current asynchronous motor according to claim 5, characterized in that said sensor is an absolute encoder, a relative encoder or a rotary transformer.
8. An alternating current asynchronous motor according to claim 5, characterized in that the driving wheel of said driving wheel set is connected to the middle of said driving sleeve by means of a key connection, an interference fit or a jackscrew fixation.
9. An alternating current asynchronous motor according to claim 5, characterized in that said sensor is fixed to said upper cover, said upper cover being mounted on said tail flange by means of fasteners.
10. An electrically operated valve comprising a valve, a transmission, an ac asynchronous motor and a driver, wherein the ac asynchronous motor is connected to the valve via the transmission, and the driver is connected to the ac asynchronous motor and controls the opening and closing of the valve via the ac asynchronous motor, wherein the ac asynchronous motor is the ac asynchronous motor according to any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220588631.XU CN217469693U (en) | 2022-03-17 | 2022-03-17 | Electric valve and alternating current asynchronous motor thereof |
| PCT/CN2023/081805 WO2023174359A1 (en) | 2022-03-17 | 2023-03-16 | Electric valve, and alternating current asynchronous electric motor therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220588631.XU CN217469693U (en) | 2022-03-17 | 2022-03-17 | Electric valve and alternating current asynchronous motor thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217469693U true CN217469693U (en) | 2022-09-20 |
Family
ID=83265090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220588631.XU Active CN217469693U (en) | 2022-03-17 | 2022-03-17 | Electric valve and alternating current asynchronous motor thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN217469693U (en) |
| WO (1) | WO2023174359A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174359A1 (en) * | 2022-03-17 | 2023-09-21 | 北京雷蒙赛博核装备技术研究有限公司 | Electric valve, and alternating current asynchronous electric motor therefor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001169522A (en) * | 1999-12-07 | 2001-06-22 | Toshiba Corp | Rotating electric machine |
| CN202696425U (en) * | 2012-07-31 | 2013-01-23 | 成都联腾动力控制技术有限公司 | Magnetic pole deviation permanent magnetic synchronous motor used for electric automobile |
| CN203119718U (en) * | 2012-12-03 | 2013-08-07 | 河南华阳能源发电科技有限公司 | Three-phase alternating-current frequency-conversion speed-regulation asynchronous motor used for electric automobile |
| CN112113019B (en) * | 2020-09-17 | 2022-03-04 | 北京雷蒙赛博机电技术有限公司 | Automatic control method for valve actuator |
| CN217469693U (en) * | 2022-03-17 | 2022-09-20 | 北京雷蒙赛博核装备技术研究有限公司 | Electric valve and alternating current asynchronous motor thereof |
-
2022
- 2022-03-17 CN CN202220588631.XU patent/CN217469693U/en active Active
-
2023
- 2023-03-16 WO PCT/CN2023/081805 patent/WO2023174359A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174359A1 (en) * | 2022-03-17 | 2023-09-21 | 北京雷蒙赛博核装备技术研究有限公司 | Electric valve, and alternating current asynchronous electric motor therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023174359A1 (en) | 2023-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217469693U (en) | Electric valve and alternating current asynchronous motor thereof | |
| CN104506000A (en) | Asynchronous motor | |
| CN110081005B (en) | Large-scale axial fan with shaftless movable blades capable of being adjusted and locking blades synchronously | |
| CN2795175Y (en) | Electric driven roller shaft type drilling machine winch | |
| CN107565749B (en) | Permanent magnet synchronous motor direct-drive car puller | |
| CN202334219U (en) | Direct drive permanent-magnet synchronous motor for screw pump | |
| CN104242543A (en) | Curtain opening and closing motor with electromagnet clutch | |
| CN201033626Y (en) | Driver for electric bicycle | |
| CN204334257U (en) | A kind of asynchronous machine | |
| CN111425652B (en) | Flywheel battery energy storage reset servo direct-drive type straight-stroke rapid cut-off actuating mechanism | |
| CN211738165U (en) | Dual-purpose electric actuator for adjusting double switches | |
| CN201272472Y (en) | Air cooling electric driven hub | |
| CN111277094B (en) | Composite disc type driving motor | |
| CN217153197U (en) | Electric valve and transmission device and position sensor thereof | |
| CN2919687Y (en) | Electromagnetic brake device for preventing sucker rod of screw pump well from reversing | |
| CN217207973U (en) | Electric valve and driving motor and position sensor thereof | |
| CN209375434U (en) | A kind of cartridge type permanent-magnet speed governor installing end face guide vane additional | |
| CN200990552Y (en) | Deformed rotor superlow speed large torque short magnetic path speed control motor | |
| CN200999905Y (en) | Intelligent electric operator | |
| CN108639985B (en) | Efficient composite brake mode alternating-current variable-frequency winch and lowering control method thereof | |
| CN217130463U (en) | Electric valve and transmission device thereof | |
| CN201395245Y (en) | Helicopter powered with electricity | |
| CN111555580A (en) | Low-speed large-torque permanent magnet synchronous motor for plunger pump | |
| CN111691964A (en) | Non-contact clutch fan | |
| CN109546831A (en) | Crane water cooling direct-drive permanent magnet synchronous motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |