CN112761594B - Method for acquiring rotation angle of crank, method for positioning bottom dead center and frequency converter - Google Patents
Method for acquiring rotation angle of crank, method for positioning bottom dead center and frequency converter Download PDFInfo
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- CN112761594B CN112761594B CN202110156608.3A CN202110156608A CN112761594B CN 112761594 B CN112761594 B CN 112761594B CN 202110156608 A CN202110156608 A CN 202110156608A CN 112761594 B CN112761594 B CN 112761594B
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000005086 pumping Methods 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims description 22
- 230000009467 reduction Effects 0.000 claims description 16
- 208000006011 Stroke Diseases 0.000 description 10
- 238000010586 diagram Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 241001023788 Cyttus traversi Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
- E21B43/127—Adaptations of walking-beam pump systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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Abstract
The application relates to a crank rotation angle obtaining method, a bottom dead center positioning method and a frequency converter. The method for acquiring the rotation angle of the crank is applied to a beam pumping unit and comprises the following steps: the method comprises the steps of obtaining a crank rotation angular velocity, obtaining the time length of one cycle of crank rotation, obtaining a current correction coefficient, and obtaining the crank rotation angle according to the crank rotation angular velocity, the time length of one cycle of crank rotation and the current correction coefficient. The technical problem of how to accurately acquire the rotation angle of the crank of the beam pumping unit is solved.
Description
Technical Field
The application relates to the field of control, in particular to a crank rotation angle obtaining method, a bottom dead center positioning method and a frequency converter.
Background
In the actual oil extraction engineering, the crank rotation angle of the beam pumping unit is closely related to the accurate stop at the upper and lower dead center positions when the pumping unit executes the safe maintenance of equipment, the angle control of left and right swinging during the pumping operation of the pumping unit, the indicator diagram calculation, the speed conversion of the upper stroke, the lower stroke, the upper stroke and the lower stroke, and the like, and the crank rotation angle is usually detected by installing an encoder.
Disclosure of Invention
In order to solve the technical problem of accurately acquiring the rotation angle of the crank, the application provides an acquisition method of the rotation angle of the crank, a bottom dead center positioning method and a frequency converter.
In a first aspect, the application provides a method for acquiring a rotation angle of a crank, which is applied to a beam pumping unit, and the method includes:
the crank rotation angular velocity is acquired,
the time length of one rotation of the crank is obtained,
the current correction coefficient is obtained and the current correction coefficient is obtained,
according to the crank rotation angular velocity, the time length of one rotation of the crank and the current correction coefficient,
and acquiring the rotation angle of the crank.
Optionally, the obtaining the length of time of one rotation of the crank includes:
the acquisition preset position captures two adjacent moments of the crank passing through,
acquiring a time interval of the two adjacent moments, wherein the time interval is the duration of one rotation of the crank;
wherein the preset position is a top dead center.
Alternatively, the acquiring the crank rotation angular velocity includes:
acquiring the output frequency of the frequency converter of the beam-pumping unit, the number of pole pairs of a motor of the beam-pumping unit and the slip ratio of the motor;
obtaining a motor transmission ratio according to the motor belt transmission ratio and the reduction ratio of the gear reduction box;
according to the output frequency of the frequency converter, the number of pole pairs of the motor, the slip ratio of the motor and the transmission ratio of the motor,
acquiring the rotating speed of a crankshaft;
the crank rotation angular velocity is acquired from the rotation speed of the crankshaft and the crank rotation period.
Optionally, the obtaining the current correction coefficient further includes:
the historical crank rotation angle is obtained,
obtaining an angle error value for the historical crank rotation angle,
if the angle error value is within a predetermined angle error range,
obtaining the historical crank rotation angle of the angle error value within a preset angle error range,
acquiring a historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within a preset angle error range;
according to the historical crank rotation angle of the angle error value within the preset angle error range, the crank rotation period and the historical correction coefficient,
and acquiring the current correction coefficient.
In a second aspect, the present application provides a bottom dead center positioning method, which applies the above method for obtaining the rotation angle of the crank, and the positioning method includes:
the rotational angular velocity of the crank is acquired,
the time length of one rotation of the crank is obtained,
the current correction factor is obtained and the current correction factor,
according to the crank rotation angular velocity, the time length of one rotation of the crank and the current correction coefficient,
acquiring the rotation angle of the crank;
the rotation angle of the crank at the time when the crank is captured at the preset position is acquired as a first angle,
acquiring a crank rotating angle captured by the preset position as a second angle, wherein the second angle is a position corresponding to a bottom dead center of the beam pumping unit when the difference between the second angle and the first angle is 180 degrees;
wherein the preset position is a top dead center.
Optionally, the obtaining the length of time of one rotation of the crank includes:
the preset position is acquired to capture two adjacent moments passed by the crank,
and acquiring the time interval of the two adjacent moments, wherein the time interval is the duration of one rotation of the crank.
Alternatively, the acquiring the crank rotation angular velocity includes:
acquiring the output frequency of the frequency converter of the beam-pumping unit, the number of pole pairs of a motor of the beam-pumping unit and the slip ratio of the motor;
obtaining a motor transmission ratio according to the motor belt transmission ratio and the reduction ratio of the gear reduction box;
according to the output frequency of the frequency converter, the number of pole pairs of the motor, the slip ratio of the motor and the transmission ratio of the motor,
acquiring the rotating speed of a crankshaft;
the crank rotation angular velocity is acquired from the rotation speed of the crankshaft and the crank rotation period.
Optionally, the obtaining the current correction coefficient further includes:
the historical crank rotation angle is obtained,
obtaining an angle error value for the historical crank rotation angle,
if the angle error value is within a predetermined angle error range,
obtaining the historical crank rotation angle of the angle error value within a preset angle error range,
acquiring a historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within a preset angle error range;
according to the historical crank rotation angle of the angle error value within the preset angle error range, the crank rotation period and the historical correction coefficient,
and acquiring the current correction coefficient.
In a third aspect, the present application provides a frequency converter, which applies the above method for obtaining the rotation angle of the crank, and the frequency converter includes:
a crank rotation angle acquisition module for acquiring the crank rotation angular velocity, for acquiring a time length of one rotation of the crank, for acquiring a current correction coefficient,
and the crank rotation angle is obtained according to the crank rotation angular velocity, the time length of one rotation of the crank and the current correction coefficient.
Optionally, the frequency converter further includes:
the crank rotation angle acquisition module is further used for acquiring historical crank rotation angles and acquiring angle error values of the historical crank rotation angles,
if the angle error value is within a predetermined angle error range,
and is further configured to obtain a historical crank rotation angle for which the angle error value is within a preset angle error range,
the historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within the preset angle error range is obtained;
and the correction module is used for acquiring the current correction coefficient according to the historical crank rotating angle of the angle error value within a preset angle error range, the crank rotating period and the historical correction coefficient.
According to the method for acquiring the crank rotation angle of the beam pumping unit, the crank rotation angle is acquired through the crank rotation angular velocity, the time length of one cycle of crank rotation and the current correction coefficient, the crank rotation angle in the working process of the pumping unit can be accurately acquired, a reliable data base is further provided for calculating the indicator diagram of the pumping unit, capturing the accurate execution time of the upper stroke and the lower stroke and capturing the positions of the upper dead point and the lower dead point, and the stability and the reliability of a system are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic flow chart of a method for obtaining the rotation angle of a crank in an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for obtaining a rotation angle of a crank according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a frequency converter in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, in an embodiment of the present application, there is provided a method for acquiring a crank rotation angle, which is applied to a beam pumping unit, the method including:
step 100: acquiring a crank rotation angular velocity;
step 200: acquiring the time length of one rotation of the crank;
step 300: acquiring a current correction coefficient;
step 400: and acquiring the rotation angle of the crank according to the rotation angular velocity of the crank, the time length of one rotation of the crank and the current correction coefficient.
In the embodiment of the application, the frequency converter of the beam pumping unit drives the motor to rotate, and the motor and the output shaft of the reduction gearbox are driven by the belt to do repeated circular motion, wherein the circular motion can be constant speed or variable speed.
In the embodiments of the present application,
the crank is rotated around the output shaft of the reduction gearbox, the length of the crank is taken as the radius, and the radian of the crank is measured in rad;
omega is the rotation angular velocity of the crank with the unit of rad/s;
t is the time length of one rotation of the crank, and the unit is s;
K 2 the initial value is preset to be 1.00 for the current correction coefficient, and the coefficient is corrected during operation.
In the embodiment of the application, the method for acquiring the crank rotation angle of the beam-pumping unit acquires the crank rotation angle through the crank rotation angular velocity, the time length of one cycle of crank rotation and the current correction coefficient, and can accurately acquire the crank rotation angle in the working process of the pumping unit without installing an encoder, thereby providing a reliable data base for calculating the indicator diagram of the pumping unit, capturing the accurate execution time of the up-down stroke and capturing the positions of the upper dead point and the lower dead point, improving the stability and the reliability of a system, and solving the technical problem of accurately acquiring the crank rotation angle in real time.
In the embodiment of the application, firstly, according to the corresponding relation between the rotation angle of the crank and the load of the suspension point, real-time and accurate data can be provided for generating the indicator diagram, so that the implementation working condition analysis and judgment of the pumping unit are facilitated; secondly, the accurate acquisition of the rotation angle of the crank can ensure that a reasonable swing angle suitable for the working condition of the beam pumping unit is obtained in the running state of the pumping and swinging of the beam pumping unit in the middle of cold weather, and the running reliability of the system is improved; and thirdly, accurate positions of upper and lower dead points are provided for the running state of the beam pumping unit with high speed and low speed and/or high speed and low speed, so that accurate basis is provided for speed conversion at the upper and lower dead points, electric energy is reasonably distributed, and the purpose of energy conservation is achieved.
In an embodiment of the present application, obtaining a length of time for one rotation of the crank includes:
the acquisition preset position captures two adjacent moments of the crank passing through,
acquiring a time interval of two adjacent moments, wherein the time interval is the duration of one rotation of the crank;
wherein the preset position is a top dead center.
In the embodiment of the application, a top dead center sensor is arranged, the top dead center sensor is an inductive sensor and can be a magnetic induction sensor, and the crank passes through the sensor by induction capture, so that the passing time is obtained; the timing is started each time the crank passes the sensor and is captured by the sensor, and the time of re-sensing the trigger is the end of one revolution period.
In an embodiment of the present application, referring to fig. 2, acquiring a crank rotation angular velocity includes:
step 101: acquiring the output frequency of a frequency converter of the beam-pumping unit, the number of pole pairs of a motor of the beam-pumping unit and the slip ratio of the motor;
step 102: acquiring a motor transmission ratio according to a motor belt transmission ratio and a reduction ratio of a gear reduction box;
step 103: acquiring the rotating speed of a crankshaft according to the output frequency of the frequency converter, the number of pole pairs of the motor, the slip ratio of the motor and the transmission ratio of the motor;
step 104: a crank rotation angular velocity is acquired from the rotation speed of the crankshaft and the crank rotation period.
In the embodiment of the application, the output frequency of the frequency converter of the beam-pumping unit is f, and the unit is Hz; the number of pole pairs of a motor of the beam pumping unit is p, the slip ratio of the motor is s, and if the motor is a synchronous motor, s is 0; the transmission ratio of the motor is K 1 The transmission ratio of the motor is determined by the transmission ratio of a motor belt and the reduction ratio of a gear reduction box; the crankshaft rotational speed is n, in rpm/min;
wherein:
in the embodiment of the application, the output frequency f of the frequency converter ranges from 20.00Hz to 50.00Hz, so that the accuracy, reliability and safety of system operation are further improved.
In an embodiment of the present application, obtaining the current correction coefficient further includes:
the historical crank rotation angle is obtained,
obtaining an angle error value of historical crank rotation angles,
if the angle error value is within the predetermined angle error range,
obtaining historical crank rotation angles with the angle error values within a preset angle error range,
acquiring historical correction coefficients corresponding to historical crank rotation angles,
according to the historical crank rotation angle, the crank rotation period and the historical correction coefficient of the angle error value within the preset angle error range,
and acquiring a current correction coefficient.
In the embodiment of the application, after the system is powered on during operation for the first time, the situation that the rotating angle of the crank is not within the preset angle error range can occur, and in the situation, the rotating angle of the crank is abandoned until the rotating angle of the crank is within the error range; furthermore, the current correction coefficient is corrected according to the historical correction coefficient, the corrected coefficient tends to be appropriate, the corrected coefficient is stored, and when the power is powered on again, the stored coefficient can be directly used, so that the rotation angle of the crank is ensured to be within the preset error range when the power is powered on again.
In the embodiment of the present application, the preset angle error is Δ θ,
when the angle is theta-2 pi | theta, the obtained crank rotation angle can be used;
and correcting the K2 by the following method:
wherein, K 2-1 The historical correction factor may be the correction factor of the last rotation period.
In the embodiment of the present application, there may be a deviation in the acquired crank rotation angle, and the reason for the deviation arises from the following aspects: the motor has insufficient stable precision on the output frequency f under open-loop control, and a high-performance vector control mode can be adopted to drive the motor in order to improve the frequency output precision; belt slippage or gear box wear; the actual working condition changes to cause load change, and the actual transmission ratio is not properly set; therefore, after each rotation period is finished, K is paired 2 And correcting to reduce the deviation, so that the acquired crankshaft rotation angle is closer to the actual position angle value, and the acquisition accuracy of the crankshaft rotation angle in the open-loop mode without the encoder is improved.
In an embodiment of the present application, the present application provides a bottom dead center positioning method, which applies the above method for acquiring a crank rotation angle, including:
acquiring a crank rotation angular velocity; acquiring the time length of one rotation of the crank; acquiring a current correction coefficient;
acquiring a crank rotation angle according to the crank rotation angular velocity, the crank rotation one-circle time length and the current correction coefficient;
acquiring a crank rotation angle when a crank is captured at a preset position as a first angle;
acquiring a crank rotating angle captured by a preset position to be a second angle;
when the difference value between the second angle and the first angle is 180 degrees, the second angle is the position corresponding to the bottom dead center of the beam pumping unit; wherein the preset position is a top dead center.
In the embodiment of the application, when the pumping unit works, the pumping unit reciprocates up and down once to be called a stroke, the point is called a bottom dead center when the horse head runs to the lowest end of the polish rod, and the point is called an upper dead center when the horse head runs to the highest end; in the upper stroke stage of one stroke cycle of the pumping unit, the crank moves downwards, and the position of the crank, which is moved to six and a half points, is the position of a top dead center, namely the position of a preset top dead center; in the down stroke phase, the crank moves upward to a twelve-point position, which is the bottom dead center position, that is, the difference in the angles of the top and bottom dead centers is 180 degrees.
In the embodiment of the present application, as described above with respect to the top dead center sensor, the top dead center sensor is arranged to obtain the position of the top dead center, and then the crank rotation angle difference in the same rotation period is 180 degrees to obtain the position of the bottom dead center, so that the technical problem that in practical application, the bottom dead center cannot be accurately obtained due to the arrangement of only one top dead center sensor is solved.
In an embodiment of the present application, obtaining a length of time for one rotation of the crank includes:
the acquisition preset position captures two adjacent moments of the crank passing through,
and acquiring the time interval of two adjacent moments, wherein the time interval is the duration of one rotation of the crank.
In an embodiment of the present application, acquiring a crank rotation angular velocity includes:
acquiring the output frequency of a frequency converter of the beam-pumping unit, the number of pole pairs of a motor of the beam-pumping unit and the slip ratio of the motor;
acquiring a motor transmission ratio according to a motor belt transmission ratio and a reduction ratio of a gear reduction box;
according to the output frequency of the frequency converter, the magnetic pole pair number of the motor, the slip ratio of the motor and the transmission ratio of the motor,
acquiring the rotating speed of a crankshaft;
a crank rotation angular velocity is acquired from the rotation speed of the crankshaft and the crank rotation period.
In an embodiment of the present application, obtaining the current correction coefficient further includes:
the historical crank rotation angle is obtained,
obtaining an angle error value of historical crank rotation angles,
if the angle error value is within the predetermined angle error range,
obtaining the historical crank rotation angle of the angle error value within a preset angle error range,
acquiring a historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within a preset angle error range;
and acquiring the current correction coefficient according to the historical crank rotation angle of the angle error value within a preset angle error range, the crank rotation period and the historical correction coefficient.
In an embodiment of the present application, referring to fig. 3, the present application provides a frequency converter applying the above method for obtaining a crank rotation angle, the frequency converter including:
a crank rotation angle acquisition module 10 for acquiring a crank rotation angular velocity, for acquiring a time length of one crank rotation, for acquiring a current correction coefficient,
and the crank rotation angle is obtained according to the crank rotation angular velocity, the time length of one crank rotation and the current correction coefficient.
In the embodiment of the application, the crank rotation angle acquisition module 10 of the frequency converter is used for acquiring the crank rotation angle in real time, so that an accurate data base is provided for indicator diagram display, intermittent whipping operation and upper and lower dead point parking in the operation process of the beam pumping unit, and the performance and reliability of the system are improved.
In the embodiment of the present application, the frequency converter further includes a modification module 20:
the crank rotation angle acquisition module is also used for acquiring historical crank rotation angles and acquiring angle error values of the historical crank rotation angles,
if the angle error value is within the predetermined angle error range,
and is also used for obtaining the historical crank rotation angle with the angle error value within the preset angle error range,
the historical correction coefficient corresponding to the historical crank rotation angle of which the angle error value is within a preset angle error range is obtained;
and the correction module 20 is configured to obtain the current correction coefficient according to a historical crank rotation angle of the angle error value within a preset angle error range, the crank rotation period, and the historical correction coefficient. The method is used for adjusting the correction coefficient so as to obtain smaller deviation of the crank rotation angle and higher accuracy.
In the embodiment of the present application, the frequency converter further includes a crank rotation angle output module 30, configured to output the crank rotation angle obtained in real time to other devices that have requirements for the crank angle, for example, transmit the current crank rotation angle obtained in real time to a indicator diagram drawing instrument through RS485 or RS422, and use the current crank rotation angle together with the current motor power as an input parameter of the indicator diagram drawing instrument, so as to draw an indicator diagram; the indicator diagram obtained through the crank rotation angle acquired in real time better conforms to the working condition of the actual pumping unit, and the reliability and the precision of the system are improved.
FIG. 1 is a flowchart illustrating a method for obtaining a crank rotation angle according to an embodiment. It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The method for acquiring the rotation angle of the crank is applied to a beam pumping unit and comprises the following steps:
the crank rotation angular velocity is acquired,
the time length of one rotation of the crank is obtained,
the current correction coefficient is obtained and the current correction coefficient is obtained,
according to the crank rotation angular velocity, the time length of one rotation of the crank and the current correction coefficient,
acquiring the rotation angle of the crank;
the obtaining the current correction coefficient further includes:
the historical crank rotation angle is obtained and,
obtaining an angle error value for the historical crank rotation angle,
if the angle error value is within a predetermined angle error range,
obtaining the historical crank rotation angle of the angle error value within a preset angle error range,
acquiring a historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within a preset angle error range;
according to the historical crank rotation angle of the angle error value within the preset angle error range, the crank rotation period and the historical correction coefficient,
and acquiring the current correction coefficient.
2. The method of claim 1, wherein said obtaining a length of time of one rotation of said crank comprises:
the acquisition preset position captures two adjacent moments of the crank passing through,
acquiring a time interval of the two adjacent moments, wherein the time interval is the duration of one rotation of the crank;
wherein the preset position is a top dead center.
3. The method according to claim 1, wherein the acquiring a crank rotation angular velocity includes:
acquiring the output frequency of the frequency converter of the beam-pumping unit, the number of pole pairs of a motor of the beam-pumping unit and the slip ratio of the motor;
obtaining a motor transmission ratio according to the motor belt transmission ratio and the reduction ratio of the gear reduction box;
according to the output frequency of the frequency converter, the number of pole pairs of the motor, the slip ratio of the motor and the transmission ratio of the motor,
acquiring the rotating speed of a crankshaft;
the crank rotation angular velocity is acquired from the rotation speed of the crankshaft and the crank rotation period.
4. A bottom dead center positioning method, characterized in that the method applies the method of acquiring crank rotation angle according to any one of claims 1 to 3, the positioning method comprising:
the rotational angular velocity of the crank is acquired,
the time length of one rotation of the crank is obtained,
the current correction coefficient is obtained and the current correction coefficient is obtained,
according to the crank rotation angular velocity, the time length of one rotation of the crank and the current correction coefficient,
acquiring the rotation angle of the crank;
the crank rotation angle at which the crank is captured at the preset position is acquired as a first angle,
acquiring a crank rotating angle captured by the preset position as a second angle, wherein the second angle is a position corresponding to a bottom dead center of the beam pumping unit when the difference between the second angle and the first angle is 180 degrees;
wherein the preset position is a top dead center.
5. The bottom dead center positioning method of claim 4, wherein the obtaining a length of time for one rotation of the crank comprises:
the preset position is acquired to capture two adjacent moments passed by the crank,
and acquiring the time interval of the two adjacent moments, wherein the time interval is the duration of one rotation of the crank.
6. The bottom dead center positioning method according to claim 4, wherein the acquiring a crank rotation angular velocity includes:
acquiring the output frequency of the frequency converter of the beam-pumping unit, the number of pole pairs of a motor of the beam-pumping unit and the slip ratio of the motor;
obtaining a motor transmission ratio according to the motor belt transmission ratio and the reduction ratio of the gear reduction box;
according to the output frequency of the frequency converter, the magnetic pole pair number of the motor, the slip ratio of the motor and the transmission ratio of the motor,
acquiring the rotation speed of a crankshaft;
the crank rotation angular velocity is acquired from the rotation speed of the crankshaft and the crank rotation period.
7. The bottom dead center positioning method of claim 4, wherein the obtaining the current correction factor further comprises:
the historical crank rotation angle is obtained,
obtaining an angle error value for the historical crank rotation angle,
if the angle error value is within a predetermined angle error range,
obtaining the historical crank rotation angle of the angle error value within a preset angle error range,
acquiring a historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within a preset angle error range;
according to the historical crank rotation angle of the angle error value within the preset angle error range, the crank rotation period and the historical correction coefficient,
and acquiring the current correction coefficient.
8. A frequency converter, wherein the frequency converter applies the method for obtaining crank rotation angle according to any one of claims 1 to 3, and the frequency converter comprises:
a crank rotation angle acquisition module for acquiring the crank rotation angular velocity, for acquiring a time length of one rotation of the crank, for acquiring a current correction coefficient,
and the crank rotation angle is obtained according to the crank rotation angular velocity, the time length of one rotation of the crank and the current correction coefficient.
9. The frequency converter of claim 8, further comprising:
the crank rotation angle acquisition module is also used for acquiring historical crank rotation angles and acquiring angle error values of the historical crank rotation angles,
if the angle error value is within a predetermined angle error range,
and is further configured to obtain a historical crank rotation angle for which the angle error value is within a preset angle error range,
the historical correction coefficient corresponding to the historical crank rotating angle of which the angle error value is within the preset angle error range is obtained;
and the correction module is used for acquiring the current correction coefficient according to the historical crank rotating angle of the angle error value within a preset angle error range, the crank rotating period and the historical correction coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110156608.3A CN112761594B (en) | 2021-02-04 | 2021-02-04 | Method for acquiring rotation angle of crank, method for positioning bottom dead center and frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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