CN111237191B - Method and device for determining rotor phase of compressor and compressor - Google Patents
Method and device for determining rotor phase of compressor and compressor Download PDFInfo
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- CN111237191B CN111237191B CN201911230159.1A CN201911230159A CN111237191B CN 111237191 B CN111237191 B CN 111237191B CN 201911230159 A CN201911230159 A CN 201911230159A CN 111237191 B CN111237191 B CN 111237191B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
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Abstract
The invention discloses a method and a device for determining a rotor phase of a compressor and the compressor. Wherein, the method comprises the following steps: acquiring an acceleration process response signal of a welding spot of a compressor; processing the acceleration process response signal to extract a time domain operation signal of a rotor system of the compressor at a preset moment; constructing a first relation curve corresponding to the relation between the motion space angle and the time of the rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to a rotor system; obtaining a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the relation curve I; obtaining a relation curve III corresponding to the relation between the fluctuating rotating speed of the rotor and the motion space angle according to the relation curve II; and determining the phase of the rotor of the compressor according to the relation curve III. The invention solves the technical problems that the reliability of a mode of acquiring the phase of the rotor of the compressor is lower in the related technology, so that the torque compensation of the compressor is inaccurate, and the abnormal vibration of the compressor is easily caused.
Description
Technical Field
The invention relates to the technical field of compressor control, in particular to a method and a device for determining a rotor phase of a compressor and the compressor.
Background
The phase signal of the compressor rotor has great significance on the vibration control of the compressor, particularly the torque compensation, and the abnormal vibration of the compressor can be caused by the transitional compensation or the untimely compensation; at present, the extraction of the rotor phase of the compressor is mainly a method for identifying the rotor phase by adopting an electric compressor signal, wherein the electric compressor signal mainly refers to identifying the rotor position information by acquiring the back electromotive force in the motor winding, and a certain deviation exists between the calculated rotor phase and the actual rotor phase in the processes of signal acquisition input, signal calculation, signal output and the like, and finally a torque compensation delay or advance is caused (it needs to be noted that a speed PI regulator always has a certain delay (the change of the motor output torque always lags behind the change of the compressor load torque)).
In addition, in the rotor phase extraction, a position encoder embedded in the rotor system is used to read the rotor position information at any time, but the method has high production cost.
In order to solve the problem that torque compensation of the compressor is inaccurate and vibration abnormality of the compressor is easily caused due to low reliability of a mode of acquiring a phase of a rotor of the compressor in the related art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining a rotor phase of a compressor and the compressor, which are used for solving the technical problems that the reliability of a mode of acquiring the phase of the rotor of the compressor in the related art is low, so that the torque compensation of the compressor is inaccurate, and the compressor is easy to vibrate abnormally.
According to an aspect of an embodiment of the present invention, there is provided a method of determining a rotor phase of a compressor, including: acquiring an acceleration history response signal of a welding spot of a compressor, wherein the welding spot is a point which is predetermined and used for welding a pump body of the compressor and a shell of the compressor, and the acceleration history response signal is a time domain acceleration history response signal; processing the acceleration process response signal to extract a time domain operation signal of a rotor system of the compressor at a preset moment; constructing a first relation curve corresponding to the relation between the motion space angle and the time of a rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to the rotor system; obtaining a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the relation curve I; obtaining a relation curve III corresponding to the relation between the fluctuation rotating speed and the motion space angle of the rotor according to the relation curve II; and determining the phase of the rotor of the compressor according to the third relation curve.
Optionally, the number of the welding points is three, and the angle difference between every two adjacent welding points in the three welding points is 120 °.
Optionally, the processing the acceleration history response signal includes: removing trend items from the acceleration process response signals; wherein the removing trend term processing of the acceleration history response signal comprises: collecting a plurality of sampling signals and obtaining an average value of the plurality of sampling signals; and subtracting the average value of the acceleration process response signal and the plurality of sampling signals to remove the trend term of the acceleration process response signal.
Optionally, the processing the acceleration history response signal includes: performing fast Fourier transform on the acceleration history response signal subjected to trend item removing processing to obtain a transformed acceleration history response signal; and carrying out low-pass signal filtering processing on the converted acceleration history response signal to obtain a filtered acceleration history response signal.
Optionally, constructing a relationship curve corresponding to a relationship between a motion space angle of the rotor and time according to the time-domain operation signal includes: performing interpolation calculation processing on the time domain operation signal to obtain a processed time domain operation signal; and constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and the time according to the processed time domain operation signal.
Optionally, obtaining a second relation curve corresponding to a relation between the fluctuating rotation speed of the rotor and time according to the first relation curve includes: and performing derivation processing on the relation curve I to obtain a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time.
Optionally, obtaining a relationship curve three corresponding to a relationship between the fluctuating rotation speed of the rotor and the motion space angle according to the relationship curve two includes: and eliminating the time item in the relation curve II to obtain the relation curve III.
Optionally, after determining the phase of the rotor of the compressor according to the third relation curve, the method for determining the phase of the rotor of the compressor further includes: determining a compensation value for compensating the torque of the compressor according to the position of the rotor of the compressor; and compensating the torque of the compressor according to the compensation value.
According to another aspect of the embodiments of the present invention, there is also provided a rotor phase determining apparatus of a compressor, including: the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring an acceleration history response signal of a welding spot of a compressor, the welding spot is a predetermined point for welding a pump body of the compressor and a shell of the compressor, and the acceleration history response signal is a time domain acceleration history response signal; the processing unit is used for processing the acceleration process response signal so as to extract a time domain operation signal of a rotor system of the compressor at a preset moment; the first construction unit is used for constructing a first relation curve corresponding to the relation between the motion space angle and time of a rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to the rotor system; the second construction unit is used for obtaining a second relation curve corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the first relation curve; the third construction unit is used for obtaining a relation curve III corresponding to the relation between the fluctuation rotating speed and the motion space angle of the rotor according to the relation curve II; and the determining unit is used for determining the phase of the rotor of the compressor according to the third relation curve.
Optionally, the number of the welding points is three, and the angle difference between every two adjacent welding points in the three welding points is 120 °.
Optionally, the processing unit comprises: the processing module is used for removing trend items from the acceleration process response signals; wherein the processing module comprises: the acquisition submodule is used for acquiring a plurality of sampling signals and obtaining the average value of the plurality of sampling signals; and the processing submodule is used for carrying out difference on the acceleration process response signal and the average value of the plurality of sampling signals so as to carry out trend item removing processing on the acceleration process response signal.
Optionally, the processing unit comprises: the conversion module is used for carrying out fast Fourier conversion on the acceleration history response signal subjected to trend item removing processing to obtain a converted acceleration history response signal; and the filtering module is used for carrying out low-pass signal filtering processing on the converted acceleration history response signal to obtain a filtered acceleration history response signal.
Optionally, the first construction unit comprises: the interpolation processing module is used for carrying out interpolation calculation processing on the time domain running signal to obtain a processed time domain running signal; and the first construction module is used for constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and the time according to the processed time domain operation signal.
Optionally, the second construction unit comprises: and the derivation processing module is used for performing derivation processing on the relation curve I to obtain a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time.
Optionally, the third construction unit comprises: and the elimination module is used for eliminating the time item in the relation curve II to obtain the relation curve III.
Optionally, the device for determining the rotor phase of the compressor further comprises: the determining unit is used for determining a compensation value for compensating the torque of the compressor according to the position of the rotor of the compressor after determining the phase of the rotor of the compressor according to the third relation curve; and the compensation unit is used for compensating the torque of the compressor according to the compensation value.
According to another aspect of the embodiment of the present invention, there is also provided a compressor using the method for determining the rotor phase of the compressor described in any one of the above.
According to another aspect of an embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program performs the method of determining the rotor phase of the compressor described in any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program is executed to perform the method for determining the rotor phase of the compressor described in any one of the above.
In the embodiment of the invention, an acceleration history response signal of a welding spot of a compressor is collected, wherein the welding spot is a point which is predetermined and used for welding a pump body of the compressor and a shell of the compressor, and the acceleration history response signal is a time domain acceleration history response signal; processing the acceleration process response signal to extract a time domain operation signal of a rotor system of the compressor at a preset moment; constructing a first relation curve corresponding to the relation between the motion space angle and the time of the rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to a rotor system; obtaining a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the relation curve I; obtaining a relation curve III corresponding to the relation between the fluctuating rotating speed of the rotor and the motion space angle according to the relation curve II; the position of the rotor of the compressor is determined according to the relationship curve III in a mode of determining the phase of the rotor of the compressor, and the method for determining the phase of the rotor of the compressor provided by the embodiment of the invention realizes the purpose of conveniently and quickly establishing a relationship curve between the relative angular speed and the rotational angle of the rotor of the compressor and a rotational angle fluctuation curve of a rotor system of the compressor to acquire the phase of the rotor of the compressor, achieves the technical effect of improving the reliability of acquiring the phase of the rotor of the compressor, enables the acquired phase of the rotor of the compressor to be more accurate, further can improve the accuracy of torque compensation of the compressor, reduces abnormal vibration of the compressor, and further solves the technical problems that the reliability of a mode of acquiring the phase of the rotor of the compressor in the related technology is lower, the torque compensation of the compressor is inaccurate, and the abnormal vibration of.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a method of determining a rotor phase of a compressor according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a compressor housing acceleration sensor circumferential 3 point 120 angular distribution in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of a compressor housing circumferential three point acceleration vibration signal according to an embodiment of the present invention;
FIG. 4 is a flow chart of an alternative compressor rotor phase determination method according to an embodiment of the present invention;
fig. 5 is a schematic view of a rotor phase determining apparatus of a compressor according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided a method embodiment of a method for determining rotor phase of a compressor, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system, such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than presented herein.
Fig. 1 is a flowchart of a method for determining a rotor phase of a compressor according to an embodiment of the present invention, as shown in fig. 1, including the steps of:
step S102, acquiring an acceleration history response signal of a welding point of the compressor, wherein the welding point is a point which is predetermined and used for welding a pump body of the compressor and a shell of the compressor, and the acceleration history response signal is a time domain acceleration history response signal.
Alternatively, the number of the welding points may be three, and the angle difference between every two adjacent welding points in the three welding points is 120 °.
Optionally, acceleration sensors are arranged at three circumferential points (i.e., the three welding points) of the compressor housing, the three acceleration sensors are distributed according to an angle of 120 °, and the positioning positions are three welding points of the pump body of the compressor.
Fig. 2 is a schematic diagram of a circumferential 3-point 120-degree angular distribution of compressor shell acceleration sensors according to an embodiment of the invention, and as shown in fig. 2, three PCB acceleration sensors are arranged at positions corresponding to three welding points in the circumferential direction of the compressor, and can be used for capturing the spatial motion position of a rotor system cam in the compressor at any time and at any operating frequency. In addition, as shown in FIG. 2, an accumulator is also connected to the compressor.
It should be noted that, in the embodiment of the present invention, the spatial motion position of the rotor system cam inside the compressor at any time and at any operating frequency is captured by acquiring the acceleration history response signal of the welding point of the compressor.
And step S104, processing the acceleration process response signal to extract a time domain operation signal of the rotor system of the compressor at a preset time.
And S106, constructing a first relation curve corresponding to the relation between the motion space angle and the time of the rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to the rotor system.
And S108, obtaining a second relation curve corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the first relation curve.
And step S110, obtaining a relation curve III corresponding to the relation between the fluctuating rotating speed of the rotor and the motion space angle according to the relation curve II.
And step S112, determining the phase of the rotor of the compressor according to the relation curve III.
As can be seen from the above, in the embodiment of the present invention, an acceleration history response signal of a welding point of a compressor may be collected, and the acceleration history response signal is processed to extract a time domain operation signal of a rotor system of the compressor at a predetermined time; constructing a first relation curve corresponding to the relation between the motion space angle and the time of the rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to a rotor system; obtaining a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the relation curve I; obtaining a relation curve III corresponding to the relation between the fluctuating rotating speed of the rotor and the motion space angle according to the relation curve II; and determining the phase of the rotor of the compressor according to the relation curve III, and compared with a method for identifying the phase of the rotor of the compressor in the related art, which mainly adopts electrical signals of the compressor (the electrical signals refer to identifying the position information of the rotor by acquiring back electromotive force in a motor winding) for extracting the phase of the rotor, certain deviation exists between the phase of the rotor and the actual phase of the rotor in the processes of signal acquisition and input, signal calculation, signal output and the like, and torque compensation is delayed or advanced finally, so that the aim of conveniently and quickly establishing a relation curve of the relative angular speed and the rotational angle of the rotor of the compressor and a rotational angle fluctuation curve of a rotor system of the compressor to obtain the phase of the.
It is easy to notice that because the relation curve of the relative angular speed and the rotational angle of the compressor rotor and the rotational angle fluctuation time domain curve of the compressor rotor system are indirectly constructed through the mechanical vibration signals, the method solves the problem of obtaining the rotational angle fluctuation time domain curve in the research of the compressor vibration load, is used as a technical scheme for reading the rotor position information at any time instead of an encoder, does not need to be deeply inserted into the internal system of the compressor, the method has strong feasibility and low cost, realizes the purpose of conveniently and quickly establishing a relation curve of the relative angular speed and the rotation angle of the rotor of the compressor and a rotation angle fluctuation curve of a rotor system of the compressor to acquire the phase of the rotor of the compressor, achieves the technical effect of improving the reliability of acquiring the phase of the rotor of the compressor, ensures that the acquired phase of the rotor of the compressor is more accurate, and then the accuracy of torque compensation of the compressor can be improved, and the abnormal vibration of the compressor is reduced.
Therefore, according to the method for determining the rotor phase of the compressor provided by the embodiment of the invention, the technical problems that the reliability of a mode for acquiring the phase of the rotor of the compressor is low in the related art, so that the torque compensation of the compressor is inaccurate, and the vibration abnormality of the compressor is easily caused are solved.
According to the above embodiment of the present invention, in step S104, the processing the acceleration history response signal may include: removing trend items from the acceleration process response signals; the trend item removing processing of the acceleration process response signal comprises the following steps: collecting a plurality of sampling signals and obtaining an average value of the plurality of sampling signals; and subtracting the average value of the acceleration process response signal and the plurality of sampling signals to remove the trend term of the acceleration process response signal.
The sampling signals are 1024 groups of acceleration time sequence signal blocks within 10s acquired by an acquisition board card under the sampling frequency of 1024Hz, and after the 1024 groups of acceleration time sequence signal blocks are obtained, the average value of a plurality of sampling signals can be obtained; in addition, the original signal in the embodiment of the present invention is the original signal of the acceleration history response signal, and the signal includes a direct current component or a trend term.
Since there may be other signal interference in the time domain vibration signal acquisition, which may cause the average amplitude of the signal to trend upward, the average value of the adopted signal needs to be subtracted from the original signal to eliminate the trend term.
In another alternative embodiment, processing the acceleration history response signal may include: performing fast Fourier transform on the acceleration history response signal subjected to trend item removing processing to obtain a transformed acceleration history response signal; and carrying out low-pass signal filtering processing on the converted acceleration history response signal to obtain a filtered acceleration history response signal. In the embodiment, the acceleration history response signal for extracting the interference signal can be obtained, and reliable guarantee is provided for obtaining the phase of the rotor of the compressor through subsequent accurate identification.
According to the above embodiment of the present invention, in step S106, constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and the time according to the time-domain operation signal may include: performing interpolation calculation processing on the time domain operation signal to obtain a processed time domain operation signal; and constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and the time according to the processed time domain operation signal.
Then, obtaining a second relation curve corresponding to the relation between the fluctuating rotation speed of the rotor and the time according to the first relation curve may include: and performing derivation processing on the relation curve I to obtain a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time.
In addition, obtaining a third relation curve corresponding to the relation between the fluctuating rotation speed of the rotor and the motion space angle according to the second relation curve may include: and eliminating the time item in the relation curve II to obtain a relation curve III.
In an alternative embodiment, after determining the phase of the rotor of the compressor according to the relationship curve three, the method for determining the phase of the rotor of the compressor further includes: determining a compensation value for compensating the torque of the compressor according to the position of the rotor of the compressor; and compensating the torque of the compressor according to the compensation value.
Fig. 3 is a schematic diagram of a circumferential three-point acceleration vibration signal of a compressor shell according to an embodiment of the invention, wherein the signal refers to variation curves of the shell normal times of 0s, 10s and 20s of the compressor. The three different curves represent the acceleration of the vertical mounting surface synchronously acquired by three acceleration sensors (namely, the PCB acceleration sensors in the context) distributed in the circumferential direction, and phase differences exist among the sinusoidal vibration response curves at the three different positions, mainly for explaining that the position of the rotor in the space can be well and indirectly identified by the distribution method. As can be seen from fig. 3, at the moment of starting (i.e., the defined 0s moment), the vibration fluctuation of the compressor is large, and the system is unstable; the compressor runs stably at the time of 10s and 20s, the signal characteristics of the compressor are consistent with the vibration signal characteristics analyzed by the compressor, and the technical method is feasible.
It should be noted that, in the embodiment of the present invention, the compressor is composed of a compressor body (a motor rotor system, a motor stator system, a crankshaft, a pump body, an eccentric cam, a sliding vane, a compressor housing, etc., where the pump body and the compressor housing are welded by three-point welding with a difference of 120 °), an L-shaped connecting pipe, and a liquid storage tank. The compressor circumgyrating shaft motion direction is defined as circumferential vibration (wherein, along the arc tangent plane of the compressor, namely the circumferential direction under the compressor cylindrical coordinate system, the circumferential vibration can also be interpreted as tangential vibration), the compressor body is defined as normal vibration along the normal surface direction of the cylindrical shell surface, the circumferential vibration is torque fluctuation caused by the difference between the driving torque of the compressor motor and the load torque of the compressor compression cavity, the normal vibration is caused by the centrifugal force of the eccentric cam mechanism in the compressor pump body in the rotation process, the cam moves for 1 circle, namely the circumferential variable speed motion within the range of 0-360 degrees, the transmission force between the cam and the pump body contact surface can also have simple harmonic effect along with the rotor motion in the process of 0-360 degrees, namely when the cam moves to the position corresponding to a certain welding point in the circumferential direction, the normal vibration amplitude at the position reaches the maximum point of the normal wave crest, when the cam moves to a 180-degree position opposite to the cam to be the lowest point of the wave trough, the highest vibration response peak value is generated at the corresponding position when the cam moves to the corresponding position of three circumferential welding points (wherein the compressor stator assembly is pressed into the compressor container and is fixed by three circumferential welding points, and the 3 welding point ranges are distributed at 120 degrees).
Fig. 4 is a flowchart of an alternative method for determining a phase of a rotor of a compressor according to an embodiment of the present invention, and as shown in fig. 4, the method includes acquiring an acceleration history response signal of a welding spot of the compressor, performing a detrending item on the acquired acceleration history response signal of the welding spot of the compressor, performing fast fourier transform processing on the acceleration history response signal after the detrending item processing, and then performing low-pass filtering on the acceleration history response signal after the fast fourier transform processing; carrying out interpolation calculation processing on the time domain operation signals to obtain processed time domain operation signals, and constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and time according to the processed time domain operation signals; carrying out derivation processing on the relation curve I to obtain a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time; eliminating the time item in the relation curve II to obtain a relation curve III; a compensation value for compensating for the torque of the compressor is determined based on the position of the rotor of the compressor.
In the embodiment, the three-point acceleration time domain history response signals are acquired and processed through a trend removing item, FFT (fast Fourier transform) and a low-pass signal; filtering and the like, extracting the space operation position of the rotor system at any moment, carrying out interpolation calculation on the time domain operation signal to construct a relation curve of a rotor motion space angle and time, deriving the relation curve to obtain a relation curve of the fluctuation rotating speed and the time of the rotor, eliminating a time item, and obtaining a relation curve of the fluctuation rotating speed and the rotor motion space angle of the rotor.
By the method for determining the rotor phase of the compressor, a new technical method for identifying the phase of a rotor system of the compressor is formed; a relation curve of a relative angular speed of a compressor rotor and a rotation angle fluctuation curve of a compressor rotor system are conveniently and quickly established and used for the research of compressor vibration control; the method can be used as a technical scheme for replacing an encoder to read the position information of the rotor at any moment, does not need to go deep into an internal system of the compressor, and has strong implementability and low cost; torque compensation in vibration control of the compressor provides good actual phase information of a compressor rotor, so that the effect of reducing vibration of the compressor is achieved, compensation torque is reasonably utilized, and the energy efficiency of the whole machine is improved; the method realizes effective control of compressor vibration, has obvious effect on reducing development cost of a pipeline system, synchronously improves product quality and reduces the risk of pipe breakage after sale.
In addition, in the embodiment of the invention, the circumferential 3-point acceleration sensor of the compressor shell is designed according to 120-degree angle distribution, and the positioning position is at three-point welding position of the compressor pump body; and calculating the phase of the compressor rotor by adopting vibration signals of the acceleration sensor at 3 point positions in the circumferential direction of the compressor shell; the actual space operation position of the rotor cam of the compressor system is identified, the obtained actual rotor system phase signal can obtain a rotating speed fluctuation curve, and the conditions that the investment is high in cost and the process that a sensor is embedded in a pressure container of the compressor is difficult to realize are avoided.
Example 2
According to another aspect of the embodiment of the present invention, there is also provided a rotor phase determining apparatus of a compressor, and fig. 5 is a schematic view of the rotor phase determining apparatus of the compressor according to the embodiment of the present invention, as shown in fig. 5, the rotor phase determining apparatus of the compressor includes: an acquisition unit 51, a processing unit 52, a first construction unit 53, a second construction unit 54, a third construction unit 55 and a determination unit 56. The following describes the rotor phase determining apparatus of the compressor in detail.
The acquisition unit 51 is configured to acquire an acceleration history response signal of a welding spot of the compressor, where the welding spot is a predetermined point at which a pump body of the compressor and a shell of the compressor are welded, and the acceleration history response signal is a time-domain acceleration history response signal.
And the processing unit 52 is used for processing the acceleration history response signal so as to extract a time domain operation signal of the rotor system of the compressor at a preset time.
The first constructing unit 53 is configured to construct a first relation curve corresponding to a relation between a motion space angle of a rotor and time according to the time domain operation signal, where the rotor is a rotor corresponding to a rotor system.
And a second construction unit 54 for obtaining a second relation curve corresponding to the relation between the fluctuating rotation speed of the rotor and time according to the first relation curve.
And a third construction unit 55, configured to obtain a third relation curve corresponding to the relation between the fluctuating rotation speed of the rotor and the motion space angle according to the second relation curve.
And the determining unit 56 is used for determining the phase of the rotor of the compressor according to the relation curve III.
It should be noted here that the above-mentioned acquisition unit 51, processing unit 52, first constructing unit 53, second constructing unit 54, third constructing unit 55 and determination unit 56 correspond to steps S102 to S112 in embodiment 1, and the above-mentioned units are the same as the examples and application scenarios realized by the corresponding steps, but are not limited to the disclosure of embodiment 1. It should be noted that the modules described above as part of an apparatus may be implemented in a computer system such as a set of computer-executable instructions.
As can be seen from the above, in the above embodiment of the present application, the acquisition unit may be used to acquire an acceleration history response signal of a welding point of the compressor, where the welding point is a predetermined point used to weld the pump body of the compressor and the shell of the compressor, and the acceleration history response signal is a time-domain acceleration history response signal; then, processing the acceleration process response signal by using a processing unit so as to extract a time domain operation signal of a rotor system of the compressor at a preset moment; constructing a first relation curve corresponding to the relation between the motion space angle and the time of the rotor by utilizing the first construction unit according to the time domain operation signal, wherein the rotor is a rotor corresponding to the rotor system; obtaining a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time by utilizing a second construction unit according to the relation curve I; then, a third construction unit is utilized to obtain a third relation curve corresponding to the relation between the fluctuating rotating speed of the rotor and the motion space angle according to the second relation curve; and finally, determining the phase of the rotor of the compressor by using a determining unit according to the relation curve III. The device for determining the rotor phase of the compressor provided by the embodiment of the invention realizes the purpose of conveniently and quickly establishing a real relationship curve between the relative angular speed and the angular angle of the rotor of the compressor and a rotational angle fluctuation curve of a rotor system of the compressor to acquire the phase of the rotor of the compressor, achieves the technical effect of improving the reliability of the phase acquisition of the rotor of the compressor, enables the acquired phase of the rotor of the compressor to be more accurate, further improves the accuracy of torque compensation of the compressor, reduces abnormal vibration of the compressor, and solves the technical problems that the mode of acquiring the phase of the rotor of the compressor in the related art is low in reliability, inaccurate torque compensation is performed on the compressor, and the abnormal vibration of the compressor is easily caused.
In an alternative embodiment, the number of welding points is three, and the angular difference between every two adjacent welding points in the three welding points is 120 °.
In an alternative embodiment, the processing unit comprises: the processing module is used for removing trend items from the acceleration process response signals; wherein, processing module includes: the acquisition submodule is used for acquiring a plurality of sampling signals and obtaining the average value of the plurality of sampling signals; and the processing submodule is used for carrying out difference on the acceleration process response signal and the average value of the plurality of sampling signals so as to carry out trend item removing processing on the acceleration process response signal.
In an alternative embodiment, the processing unit comprises: the conversion module is used for carrying out fast Fourier conversion on the acceleration history response signal subjected to the trend item removing processing to obtain a converted acceleration history response signal; and the filtering module is used for carrying out low-pass signal filtering processing on the converted acceleration history response signal to obtain a filtered acceleration history response signal.
In an alternative embodiment, the first construction unit comprises: the interpolation processing module is used for carrying out interpolation calculation processing on the time domain running signal to obtain a processed time domain running signal; and the first construction module is used for constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and time according to the processed time domain operation signal.
In an alternative embodiment, the second construction element comprises: and the derivation processing module is used for performing derivation processing on the relation curve I to obtain a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time.
In an alternative embodiment, the third constructional unit comprises: and the elimination module is used for eliminating the time item in the relation curve II to obtain a relation curve III.
In an alternative embodiment, the apparatus for determining a rotor phase of a compressor further includes: the determining unit is used for determining a compensation value for compensating the torque of the compressor according to the position of the rotor of the compressor after determining the phase of the rotor of the compressor according to the relation curve III; and the compensation unit is used for compensating the torque of the compressor according to the compensation value.
Example 3
According to another aspect of an embodiment of the present invention, there is also provided a compressor using the method for determining a rotor phase of a compressor of any one of the above.
Example 4
According to another aspect of an embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program performs the method of determining the rotor phase of the compressor of any one of the above.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program is executed to perform the method for determining the rotor phase of the compressor according to any one of the above.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A method of determining a phase of a rotor of a compressor, comprising:
acquiring an acceleration history response signal of a welding spot of a compressor, wherein the welding spot is a point which is predetermined and used for welding a pump body of the compressor and a shell of the compressor, and the acceleration history response signal is a time domain acceleration history response signal;
processing the acceleration process response signal to extract a time domain operation signal of a rotor system of the compressor at a preset moment;
constructing a first relation curve corresponding to the relation between the motion space angle and the time of a rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to the rotor system;
obtaining a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the relation curve I;
obtaining a relation curve III corresponding to the relation between the fluctuation rotating speed and the motion space angle of the rotor according to the relation curve II;
and determining the phase of the rotor of the compressor according to the third relation curve.
2. The method of claim 1, wherein the number of said weld points is three, and the angular difference between each two adjacent ones of said three weld points is 120 °.
3. The method of claim 1, wherein processing the acceleration history response signal comprises: removing trend items from the acceleration process response signals;
wherein the removing trend term processing of the acceleration history response signal comprises:
collecting a plurality of sampling signals and obtaining an average value of the plurality of sampling signals;
and subtracting the average value of the acceleration process response signal and the plurality of sampling signals to remove the trend term of the acceleration process response signal.
4. The method of claim 3, wherein processing the acceleration history response signal comprises:
performing fast Fourier transform on the acceleration history response signal subjected to trend item removing processing to obtain a transformed acceleration history response signal;
and carrying out low-pass signal filtering processing on the converted acceleration history response signal to obtain a filtered acceleration history response signal.
5. The method of claim 1, wherein constructing a relationship curve I corresponding to a relationship between a motion space angle of the rotor and time according to the time-domain operation signal comprises:
performing interpolation calculation processing on the time domain operation signal to obtain a processed time domain operation signal;
and constructing a first relation curve corresponding to the relation between the motion space angle of the rotor and the time according to the processed time domain operation signal.
6. The method according to claim 1, wherein obtaining a second relation curve corresponding to the relation between the fluctuating rotation speed of the rotor and time according to the first relation curve comprises:
and performing derivation processing on the relation curve I to obtain a relation curve II corresponding to the relation between the fluctuating rotating speed of the rotor and time.
7. The method according to claim 1, wherein obtaining a relationship curve III corresponding to the relationship between the fluctuating rotation speed and the motion space angle of the rotor according to the relationship curve II comprises:
and eliminating the time item in the relation curve II to obtain the relation curve III.
8. The method of claim 1, further comprising, after determining the phase of the rotor of the compressor according to the relationship curve three:
determining a compensation value for compensating the torque of the compressor according to the position of the rotor of the compressor;
and compensating the torque of the compressor according to the compensation value.
9. An apparatus for determining a phase of a rotor of a compressor, comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring an acceleration history response signal of a welding spot of a compressor, the welding spot is a predetermined point for welding a pump body of the compressor and a shell of the compressor, and the acceleration history response signal is a time domain acceleration history response signal;
the processing unit is used for processing the acceleration process response signal so as to extract a time domain operation signal of a rotor system of the compressor at a preset moment;
the first construction unit is used for constructing a first relation curve corresponding to the relation between the motion space angle and time of a rotor according to the time domain operation signal, wherein the rotor is a rotor corresponding to the rotor system;
the second construction unit is used for obtaining a second relation curve corresponding to the relation between the fluctuating rotating speed of the rotor and time according to the first relation curve;
the third construction unit is used for obtaining a relation curve III corresponding to the relation between the fluctuation rotating speed and the motion space angle of the rotor according to the relation curve II;
and the determining unit is used for determining the phase of the rotor of the compressor according to the third relation curve.
10. A compressor, characterized by using the method for determining a rotor phase of a compressor according to any one of claims 1 to 8.
11. A storage medium characterized by comprising a stored program, wherein the program executes the method of determining the rotor phase of a compressor according to any one of claims 1 to 8.
12. A processor, characterized in that it is configured to run a program, wherein the program is run to execute the method for determining the phase of the rotor of a compressor according to any one of claims 1 to 8.
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| CN114876800B (en) * | 2022-04-29 | 2023-04-14 | 美的集团股份有限公司 | Phase angle determination method and device of compressor rotor, control method and device and air conditioner |
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