CN213305067U - Special large-torque variable-power reluctance motor for oil pumping unit in oil field - Google Patents
Special large-torque variable-power reluctance motor for oil pumping unit in oil field Download PDFInfo
- Publication number
- CN213305067U CN213305067U CN202120790264.7U CN202120790264U CN213305067U CN 213305067 U CN213305067 U CN 213305067U CN 202120790264 U CN202120790264 U CN 202120790264U CN 213305067 U CN213305067 U CN 213305067U
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- stator
- rotor
- reluctance motor
- pumping unit
- power
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- 238000005086 pumping Methods 0.000 title claims abstract description 27
- 238000004804 winding Methods 0.000 claims abstract description 14
- 230000009467 reduction Effects 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 34
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000006698 induction Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a special big moment of torsion variable power reluctance motor of oil field beam-pumping unit, include: the shell comprises a shell body and an end cover covering the front end face of the shell body; the stator assembly comprises a stator core and a stator winding, wherein stator pole teeth are arranged in the stator core, and the stator winding is wound on the stator pole teeth; the rotor assembly is coaxially arranged in the stator assembly and comprises a rotor core and a rotor shaft, the rotor shaft is hollow, and rotor pole teeth are arranged outside the rotor core; the reduction box comprises an input shaft, and the end part of the input shaft is coaxial and is in interference fit with the rotor shaft. The diameter of the rotor core is increased, the sectional area of the electromagnetic wire of the stator winding is increased, and the starting torque is effectively increased. The end part of the input shaft of the reduction gearbox is directly in rigid sleeve joint with the hollow rotor shaft through interference fit, a belt transmission mode is cancelled, and the connection coaxiality and connection transmission reliability of the reluctance motor and the reduction gearbox are ensured.
Description
Technical Field
The utility model relates to the technical field of electric machines, in particular to special big moment of torsion variable power reluctance motor of oil field beam-pumping unit.
Background
The vast majority of oil fields in China use rod-type pumping units to pump crude oil deeply buried to the ground, and the total number of the pumping units accounts for more than 80 percent of the total number of the pumping units. Because field usage, it is inconvenient to maintain, the simple structure of traditional beam-pumping unit design, the dependable performance. However, the performance of a system driven and dragged by a belt matched with an induction asynchronous motor or a permanent magnet synchronous motor is far behind, and the system cannot meet the requirements of green production, high efficiency and energy conservation at present.
If an induction asynchronous motor is selected, when the induction asynchronous motor operates, the stator and the rotor are asynchronous, the power factor is low, the power factor is only 0.6 or even as low as 0.2 when the induction asynchronous motor is matched with the working condition of the pumping unit, and the electric energy waste is serious. When the motor runs, the reactive power of the internal magnetic field is maintained to be constant, and the proportion of the reactive power is too high, so that the motor can generate heat seriously. Meanwhile, the induction asynchronous motor has small starting torque, and in order to meet the starting requirement of the pumping unit, the induction asynchronous motor needs to be matched with a motor with larger power by times, the starting current is 3-5 times of the normal working current, and the economy is further deteriorated.
In recent years, permanent magnet synchronous motors are commonly used, but the defects of poor robustness, more noise waves during working, serious electromagnetic eddy current heating, high electromagnetic noise and the like of the permanent magnet synchronous motors are found in use.
Like chinese utility model CN108199512A, half directly drives permanent magnet motor, it has replaced induction type asynchronous machine and has cancelled belt drive system, has eliminated belt drive's defect, but permanent magnet synchronous machine's defect still exists. The mode of fixing the motor rotor by the speed reducer is adopted during the installation, and the reliability can be further improved.
SUMMERY OF THE UTILITY MODEL
The present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. Therefore, the utility model provides a special big moment of torsion variable power reluctance motor of oil field beam-pumping unit.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
according to the utility model, the special high-torque variable-power reluctance motor for the oil pumping unit in the oil field,
the shell comprises a shell body and an end cover covering the front end face of the shell body, the shell body is in a hollow cylindrical shape, and the diameter size of the shell body is larger than the axial length size of the shell body;
the stator assembly comprises a stator core and a stator winding, wherein the stator core is formed by laminating silicon steel sheets, stator pole teeth are arranged in the stator core, and the stator winding is wound on the stator pole teeth;
the rotor assembly is coaxially arranged in the stator assembly and comprises a rotor core and a rotor shaft, the rotor shaft is hollow, and rotor pole teeth are arranged outside the rotor core;
the reduction box comprises an input shaft, and the end of the input shaft is coaxial and is in interference fit with the rotor shaft.
According to the utility model discloses special big moment of torsion of oil field beam-pumping unit becomes power reluctance motor has following beneficial effect at least: the diameter of the rotor core is increased, the sectional area of the electromagnetic wire of the stator winding is increased, and the starting torque is effectively increased. The end part of the input shaft of the reduction gearbox is directly in rigid sleeve joint with the hollow rotor shaft through interference fit, a belt transmission mode is cancelled, and the connection coaxiality and connection transmission reliability of the reluctance motor and the reduction gearbox are ensured.
According to some embodiments of the utility model, stator core's external diameter size is 8 times of its axial width, the length of stator utmost point tooth does 2 times of stator core axial width, just the width dimension of stator utmost point tooth is less than its length dimension.
According to some embodiments of the invention, the rotor teeth have a length that is 0.25 to 0.35 times the length of the stator teeth.
According to some embodiments of the invention, the rotor shaft further comprises a position sensor, the position sensor being mounted inside the rotor shaft.
According to some embodiments of the invention, the rotor teeth face the end face of the stator teeth is a cambered surface.
According to some embodiments of the invention, the rotor core or the notch on the stator core is embedded with a permanent magnet.
According to some embodiments of the invention, the inner side surface of the end cap is provided with a layer of insulating material.
According to some embodiments of the present invention, the housing is made of carbon steel.
According to some embodiments of the present invention, the reluctance motor is connected with a resistive heater.
According to some embodiments of the utility model, reluctance motor still is connected with the controller, the controller is the IGBT module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of the internal structure of the present invention in the front view direction;
FIG. 2 is a schematic diagram of the right-side internal structure of the present invention;
fig. 3 is a schematic view of a rotor tooth of the present invention.
Reference numerals: a housing 100; a housing 110; an end cap 120; a stator core 210; a stator winding 220; stator pole teeth 211; a rotor core 310; a rotor shaft 320; rotor teeth 311; an input shaft 400; a position sensor 500; notch 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 and 2, a special high-torque variable-power reluctance motor for an oil pumping unit in an oil field comprises: a casing 100 including a casing 110 and an end cover 120 covering the front end surface of the casing 110, wherein the casing 110 is hollow and cylindrical, and the diameter of the casing 110 is larger than the axial length thereof; the stator assembly comprises a stator core 210 and a stator winding 220, wherein the stator core 210 is formed by laminating silicon steel sheets, stator pole teeth 211 are arranged in the stator core 210, and the stator winding 220 is wound on the stator pole teeth 211; the rotor assembly is coaxially arranged in the stator assembly and comprises a rotor core 310 and a rotor shaft 320, the rotor shaft 320 is hollow, and rotor pole teeth 311 are arranged outside the rotor core 310; the reduction gearbox comprises an input shaft 400, and the end of the input shaft 400 is coaxially and in interference fit with the rotor shaft 320.
The utility model discloses reluctance machine is special on the beam-pumping unit in oil field. The casing 100 is shaped like a short thick cylinder, and the stator core 210 can be fixed in the casing 110 by interference fit. Compare in traditional motor, the utility model discloses a cooperation casing 110's size design, its rotor core 310 diameter increase, stator winding 220's electromagnetic wire sectional area increase effectively increases starting torque. The end part of the input shaft 400 of the reduction gearbox is directly in rigid sleeve joint with the hollow rotor shaft 320 through interference fit, a belt transmission mode is cancelled, the connection coaxiality and connection transmission reliability of the reluctance motor and the reduction gearbox are ensured, and meanwhile the radial downward pulling force of the rotor shaft 320 on the input shaft 400 can be reduced, so that the risk of oil leakage caused by damage of an oil seal of the input shaft 400 of the reduction gearbox is effectively reduced.
Wherein a key slot may be provided in the rotor shaft 320, a key may be added between the rotor shaft 320 and the input shaft 400 to further improve the transmission stability.
In some embodiments of the present invention, the outer diameter of the stator core 210 is 8 times its axial width, the length of the stator teeth 211 is 2 times the axial width of the stator core 210, and the width of the stator teeth 211 is smaller than its length. In the present embodiment, the stator core 210 will be described by taking an example in which the outer diameter dimension is 800mm and the axial width dimension is 100 mm. The stator yoke portion of the stator core 210 is 100mm, the length of the stator teeth 211 is 200mm, and the stator teeth 211 have a long and narrow structure. The winding sectional area of stator winding 220 then can reach 12 square millimeters, the utility model discloses a reluctance machine over-current capacity increases 9 times than traditional reluctance machine. The starting torque can be greatly increased by the arrangement, the required starting torque can be obtained only by giving the instantaneous current of the torque required by the reluctance motor during starting, the motor does not need to be dragged by over-power, and the electricity is obviously saved. The impact of large current on a power grid is avoided, the capacity of power distribution equipment such as a transformer and a contactor is reduced, and the influence on the quality of the power grid and the equipment purchase cost are reduced. Compared with the traditional motor, the width of the stator yoke part is increased, the using amount of magnetic steel is increased, the volume of the magnetic steel is increased, the control rotating speed range is smoothly adjustable from 30r/min to 350r/min, and the pertinence to different working conditions of the oil pumping unit is stronger.
Further, the length of the rotor teeth 311 is 0.25 to 0.35 times the length of the stator teeth 211. When the length of the stator teeth 211 is 200mm, the length of the rotor teeth 311 is 50mm to 70mm, and the preferred length of the rotor teeth 311 is 60mm, which can effectively reduce torque ripple.
As shown in fig. 2, in some embodiments of the present invention, a position sensor 500 is further included, and the position sensor 500 is installed inside the rotor shaft 320. The position sensor 500 is installed in the rotor shaft 320 in a sinking manner, so that the internal space of the rotor shaft 320 is reasonably utilized, the internal axial space of the shell 110 is saved, and the position sensor is safe and reliable.
As shown in fig. 3, in some embodiments of the present invention, the end surface of the rotor teeth 311 facing the stator teeth 211 is a cambered surface. The rotor pole teeth 311 and the stator pole teeth 211 are provided with gaps, the end faces of the rotor pole teeth 311 are arranged to be cambered surfaces, so that uneven air gaps can be formed between the rotor pole teeth 311 and the stator pole teeth 211, the average torque of the reluctance motor can be increased, and the torque pulsation can be reduced.
As shown in fig. 1, in some embodiments of the present invention, permanent magnets (not shown) are embedded in the notches 600 of the rotor core 310 or the stator core 210. Notches 600 are formed between two adjacent rotor pole teeth 311 on the rotor core 310 and between two adjacent stator pole teeth 211 on the stator core 210, and permanent magnets are arranged on the notches 600 of one of the two adjacent rotor pole teeth and the two adjacent stator pole teeth, so that an electromagnetic and permanent magnet mixed excitation structure can be realized, the torque density is improved, and the torque pulsation is reduced.
In some embodiments of the present invention, an insulating material layer is laid on the inner surface of the end cap 120, so as to prevent the insulation risk caused by the small creepage distance.
Preferably, the housing 110 is made of carbon steel; compared with a common cast iron material, the thickness of the shell 110 can be thinned by using the carbon steel material under the condition of the same structural strength, and the processing precision is facilitated.
In some embodiments of the present invention, the reluctance motor is connected to a resistive heater (not shown). The pumping unit during operation, its sucker rod can go up and down to remove, and reluctance motor need consume the electric energy when rising, and can carry out "the electricity generation that falls" through reluctance motor when descending and produce the electric energy, and the electric energy of these productions then consumes through resistance heater, and is with low costs, convenient to use.
The utility model discloses an in some embodiments, reluctance motor still is connected with the controller (not shown in the figure), and the controller is the IGBT module, can realize functions such as time delay soft start, time delay shut down and electromagnetic braking to reluctance motor. The delayed stop can avoid the sucker rod from falling freely to cause severe collision and damage during the stop, and greatly reduces the maintenance cost.
In the description herein, references to the description of a particular embodiment or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A special high-torque variable-power reluctance motor for an oil pumping unit in an oil field is characterized in that,
the casing (100) comprises a casing (110) and an end cover (120) covering the front end face of the casing (110), wherein the casing (110) is in a hollow cylindrical shape, and the diameter size of the casing (110) is larger than the axial length size of the casing (110);
the stator assembly comprises a stator core (210) and a stator winding (220), wherein the stator core (210) is formed by laminating silicon steel sheets, stator pole teeth (211) are arranged in the stator core (210), and the stator winding (220) is wound on the stator pole teeth (211);
the rotor assembly is coaxially installed in the stator assembly and comprises a rotor core (310) and a rotor shaft (320), the rotor shaft (320) is hollow, and rotor pole teeth (311) are arranged outside the rotor core (310);
a reduction gearbox comprising an input shaft (400), the end of the input shaft (400) being coaxial and interference fitted within the rotor shaft (320).
2. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: the outer diameter of the stator core (210) is 8 times of the axial width of the stator core, the length of the stator pole teeth (211) is 2 times of the axial width of the stator core (210), and the width of the stator pole teeth (211) is smaller than the length of the stator pole teeth.
3. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 2 is characterized in that: the length of the rotor pole teeth (311) is 0.25 to 0.35 times the length of the stator pole teeth (211).
4. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: further comprising a position sensor (500), the position sensor (500) being mounted inside the rotor shaft (320).
5. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: the end face of the rotor pole tooth (311) facing the stator pole tooth (211) is an arc face.
6. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: permanent magnets are embedded in the notches (600) of the rotor core (310) or the stator core (210).
7. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: and an insulating material layer is paved on the inner side surface of the end cover (120).
8. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: the shell (110) is made of carbon steel.
9. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: the reluctance motor is connected with a resistance heater.
10. The special high-torque variable-power reluctance motor for the oil pumping unit in the oil field according to claim 1 is characterized in that: the reluctance motor is also connected with a controller, and the controller is an IGBT module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120790264.7U CN213305067U (en) | 2021-04-19 | 2021-04-19 | Special large-torque variable-power reluctance motor for oil pumping unit in oil field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120790264.7U CN213305067U (en) | 2021-04-19 | 2021-04-19 | Special large-torque variable-power reluctance motor for oil pumping unit in oil field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213305067U true CN213305067U (en) | 2021-05-28 |
Family
ID=76017266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120790264.7U Withdrawn - After Issue CN213305067U (en) | 2021-04-19 | 2021-04-19 | Special large-torque variable-power reluctance motor for oil pumping unit in oil field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213305067U (en) |
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2021
- 2021-04-19 CN CN202120790264.7U patent/CN213305067U/en not_active Withdrawn - After Issue
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20210528 Effective date of abandoning: 20231204 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20210528 Effective date of abandoning: 20231204 |