CN113153747B - Axial force tracking method and system for scroll machine - Google Patents
Axial force tracking method and system for scroll machine Download PDFInfo
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- CN113153747B CN113153747B CN202110578984.1A CN202110578984A CN113153747B CN 113153747 B CN113153747 B CN 113153747B CN 202110578984 A CN202110578984 A CN 202110578984A CN 113153747 B CN113153747 B CN 113153747B
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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
- F04C28/28—Safety arrangements; Monitoring
Abstract
The invention discloses a method and a system for tracking axial force of a scroll machine, wherein the method comprises the following steps: arranging an electromagnetic probe in the vortex machine to obtain the electromagnetic force parameters of the vortex machine; establishing an original theoretical target curve of the electromagnetic force, and carrying out electromagnetic force tracking control by taking the original theoretical target curve as a target; acquiring the exhaust flow of the scroll machine and the current of a spindle motor when tracking an original theoretical target curve; partitioning, namely acquiring the initial magnitude of electromagnetic force in a partition one by one, recording the exhaust flow and the current magnitude of a spindle motor, and analyzing the feedback exhaust flow and the change rule of a spindle motor current signal; and correcting the electromagnetic force target value of each subarea one by one according to the feedback exhaust flow and the change rule of the spindle motor current signal, and generating a new most adaptive target electromagnetic force curve. The method corrects and optimizes an original theoretical target curve of the axial electromagnetic force of the scroll machine under the preset working condition according to the feedback signal.
Description
Technical Field
The invention relates to the technical field of scroll machines, in particular to a method and a system for tracking axial force of a scroll machine.
Background
The scroll compressor is a novel volumetric compression compressor, and the compression part consists of a movable scroll plate and a static scroll, and has the advantages of simple structure, few easily-damaged parts, small size, high reliability, high mechanical efficiency, low noise and other excellent thermodynamic properties and mechanical properties. The structure of the compression cavity of the scroll compressor consists of a movable scroll and a fixed scroll, and the working schematic diagram of the movable scroll and the fixed scroll is shown in figure 1. In the working process, the static vortex disc is fixed on the frame, the movable disc is driven by the eccentric shaft and restricted by the autorotation prevention mechanism, and the movable disc rotates around the center of the base circle of the static disc in a plane with a small radius. The air is sucked into the periphery of the static disc through the air filter element, and along with the rotation of the eccentric shaft, the air is gradually compressed in a plurality of crescent compression cavities formed by the engagement of the static disc and then is continuously discharged from an axial hole of the central part of the static disc. At the moment, the gas force generated in the compression gas cavity acts on the scroll plate, so that the scroll teeth and the end surfaces of the movable scroll plate and the fixed scroll plate incline or separate, and the gas leakage amount is increased. At present, the system is difficult to adapt to the application occasions with large gas displacement and large pressure ratio, and how to ensure the air tightness of the vortex plate of the vortex machine and effectively reduce the gas leakage amount is a great technical problem.
The airtightness between the orbiting scroll and the fixed scroll has an important influence on the operation performance of the compressor. Research has shown that the leakage of the scroll compressor mainly includes tangential leakage and radial leakage, namely, the leakage occurs through an axial or radial gap, and the leakage model is shown in fig. 2. The tangential leakage in the radial clearance of the scroll compressor is mainly caused by factors such as machining errors of a movable scroll and a fixed scroll, frictional wear of each moving part, insufficient assembly precision of each part and the like. The radial leakage problem in the axial gap is primarily caused by the axial gas separation forces in the compression chambers of the scroll. According to research, the axial clearance is the main problem of gas leakage, and the magnitude of the axial separating force is dynamically changed by factors such as the temperature of the gas cavity, the working frequency, the rotation angle of the main shaft and the like, so that the gas leakage and the abrasion of parts are caused, and the working performance and the service life of the scroll compressor are seriously influenced. The problem of axial dynamic sealing of the scroll machine is solved, the working performance of the scroll machine is improved, the service life of the scroll machine is prolonged, and the wider application occasions are met.
There is currently no study or methodology that can automatically track the "actual target curve" of the axial force of a scroll machine through an algorithm.
Disclosure of Invention
One of the purposes of the invention is to provide a method and a system for automatically tracking the axial separating force of a scroll machine, wherein the method and the system adopt an electromagnetic force probe method, and a target axial separating force curve of the scroll machine under a preset working condition is corrected one by one in a partition mode from an original theoretical target curve to obtain a new target electromagnetic force curve. The target electromagnetic force curve of the electromagnetic force for balancing the axial separating force can be automatically found according to the algorithm of the invention, the target electromagnetic force curve is taken as a tracking target, and the better axial force balance control is realized through the electromagnetic force control algorithm and a hardware system. The invention can effectively improve the axial sealing performance of the scroll machine, thereby improving the adaptability of the electromagnetic servo system of the scroll machine to complex working conditions.
The invention also aims to provide a tracking method for the axial force of the scroll machine, the method and the system form n equally-divided angle intervals by equally dividing n in a 360-degree rotating angle area of a spindle motor, and each angle interval can be independently and sequentially calibrated by adopting a calculation mode of step approximation in a PID algorithm, so that a target electromagnetic force curve in a single interval is approximated to an actual axial separating force curve instead of an original theoretical target axial separating force curve and is matched with an actual working condition.
The invention also aims to provide a tracking method for the axial force of the scroll machine, the method and the system correct and find a really needed electromagnetic force target electromagnetic force curve from the electromagnetic force theoretical target curve by introducing two parameters of the displacement of the scroll machine and the current of the spindle motor, carry out optimal tracking by detecting and analyzing the displacement of the scroll machine and the current of the spindle of the motor in real time, and realize optimal tracking by comparing with the last tracking condition, thereby improving the control precision of the scroll machine.
To achieve at least one of the above objects, the present invention further provides a method for tracking axial force of a scroll machine, the method comprising the steps of:
arranging an electromagnetic probe in the vortex machine to obtain the electromechanical magnetic force parameters of the vortex machine;
establishing an original theoretical target curve of the electromagnetic force, and carrying out electromagnetic force tracking control by taking the original theoretical target curve as a target;
acquiring the exhaust flow of the scroll machine and the current of a spindle motor when tracking an original theoretical target curve;
partitioning, namely acquiring the initial magnitude of electromagnetic force in a partition one by one, recording the exhaust flow and the current magnitude of a spindle motor, and analyzing the feedback exhaust flow and the change rule of a spindle motor current signal;
and correcting the electromagnetic force target values of all the subareas one by one according to the feedback exhaust flow and the change rule of the current signal of the spindle motor to generate a new 'target electromagnetic force curve' which is most adaptive.
According to a preferred embodiment of the invention, n angle equal divisions are set, wherein the angle of each angle equal division is 360/n, and when the system is started, the tracking operation of the target electromagnetic force curve is executed in each angle equal division.
According to another preferred embodiment of the present invention, after startup, the tracking-ahead PID control method is executed so that the "actual electromagnetic force curve" approaches the "target electromagnetic force curve".
According to another preferred embodiment of the present invention, the method for finding the "target electromagnetic force curve" comprises the following steps: when entering into the adjacent subareas, the electromagnetic force needing to be tracked and calibrated is firstly set as the value of the original theoretical target curve corresponding to the electromagnetic force between the subareas.
According to another preferred embodiment of the present invention, the method for finding the "target electromagnetic force curve" comprises the following steps: after the tracking of the electromagnetic force value approaching the target partition is executed, the actual electromagnetic force value of the current partition is further increased by increasing the electromagnetic force value tracking the target in the current partition, the current size of the spindle motor and the exhaust flow of the scroll machine in the time period corresponding to the partition are obtained, the exhaust flow and the size change of the spindle motor are judged, the approaching degree of the current electromagnetic force and the actually required target axial separating force or the corresponding target electromagnetic force is judged according to the exhaust flow and the size change of the spindle motor, the electromagnetic force value of a target electromagnetic force curve between the partitions is obtained, the value of an original theoretical target curve between the partitions is corrected by the target electromagnetic force curve, and the target electromagnetic force curve is further close to the actual target curve.
According to another preferred embodiment of the invention, after exhaust flow data of the scroll machine is collected, whether the exhaust flow is increased is judged, if so, the electromagnetic force of the subareas is continuously increased, and the current of the spindle motor and the exhaust flow of the scroll machine corresponding to the subareas are monitored in real time; if the air flow is continuously increased under the condition of continuously increasing the electromagnetic force of the subarea, the electromagnetic force value of the tracking target in the current subarea is continuously increased, and the electromagnetic force value of the tracking target is controlled to be increased by the actual electromagnetic force to dynamically track the tracking target in real time.
According to another preferred embodiment of the present invention, if the exhaust flow rate is kept unchanged or decreased under the condition of continuously increasing the electromagnetic force between the current sub-zones, then it is determined whether the spindle motor current is increased, if so, it is determined that the scroll machine under the current electromagnetic force is in an axial overvoltage state, and the "electromagnetic force value of the tracking target" determined last time between the sub-zones is used as the "value of the target electromagnetic force curve between the sub-zones" as the tracking target value between the sub-zones during the later operation.
According to another preferred embodiment of the present invention, if the exhaust flow is kept constant or reduced and the spindle motor current is kept constant or reduced under the condition of continuously increasing the current inter-division electromagnetic force, the current inter-division electromagnetic force is further increased by increasing the value of the current inter-division tracking target.
According to another preferred embodiment of the present invention, if it is detected that the exhaust flow remains unchanged, the "actual electromagnetic force" in the current partition is continuously reduced by continuously reducing the "tracked target value" in the current partition, the exhaust flow of the scroll machine corresponding to the partition is monitored in real time, if the exhaust flow is reduced, it is determined that the scroll machine is in a leakage state, and the "tracked target value" in the previous partition is taken as the "actual target curve value" in the partition.
To achieve at least one of the above objects, the present invention further provides a scroll axial force tracking system using the above scroll axial force tracking method.
To achieve at least one of the above objects, the present invention further provides a scroll machine employing the above axial force tracking method of a scroll machine.
Drawings
Fig. 1 is a schematic structural view showing a scroll compressor in the prior art.
Fig. 2 shows a schematic diagram of a leakage model in the prior art.
FIG. 3 is a flow chart illustrating a method for tracking axial force of a scroll machine according to the present invention.
Fig. 4a shows a schematic diagram of an initialization curve of a first bisected angle interval according to the invention.
Fig. 4b shows a schematic graph of the tracking calibration process of the first bisected angle interval according to the present invention.
Fig. 4c is a schematic diagram showing the completion of the tracking calibration of the first bisected angle interval according to the present invention.
FIG. 5 is a schematic diagram showing the overall process of the automatic probe tracking according to the present invention.
FIG. 6 is a graph showing the completion of tracking for all the bisected angle intervals in the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Referring to fig. 1-6, the invention discloses a method and system for tracking axial separating force of a scroll machine, the method firstly needs to initialize to generate a calculated ideal electromagnetic force 'original theoretical target curve', the curve is used as an initial target curve, and an 'advanced tracking PID algorithm' is adopted in the running process of the scroll machine to enable an electromagnetic suction force curve output by an electromagnetic servo system to approach an electromagnetic force 'target electromagnetic force curve', so as to achieve the purpose of balancing the axial separating force of the scroll machine under the working condition. It should be noted that the "tracking-ahead PID algorithm" is prior art, and the present invention is not described in detail here. In the process of obtaining the optimal matched electromagnetic force target curve, the current of the spindle motor and the exhaust flow of the scroll machine are continuously referred to, and the original theoretical target curve of the electromagnetic force is continuously corrected, so that the target electromagnetic force curve is continuously close to the most matched electromagnetic force target curve, whether the corrected target axial separation force curve is effective is further judged according to the current of the spindle motor and the exhaust flow of the scroll machine, and if the corrected target axial separation force curve is effective, the corrected target axial separation force curve is used as the target electromagnetic force curve. It should be noted that the "tracking-in-advance PID algorithm" is the prior art, and please refer to the invention patent with application number 201911241902.3 specifically, and the detailed steps of the "tracking-in-advance PID algorithm" are not repeated in the present invention. The actual target electromagnetic force curve is an actual optimal curve, but the optimal curve can only be approximated but cannot be completely the same.
It is worth mentioning that the invention adopts the idea of segment approximation to establish the "target electromagnetic force curve", specifically, the electromagnetic force curve is equally divided into n equally divided angle intervals according to the rotation period of the spindle motor, the rotation period of the spindle motor is 360 °, therefore, the width of each equally divided angle interval is 360 °/n, the electromagnetic force theoretical curve is divided into n equally divided angle intervals, the electromagnetic force tracking target value corresponding to the "original theoretical target curve" of the initial stage corresponding to the first equally divided angle interval is obtained, at this time, the electromagnetic force theoretical value corresponding to the 0 ° angle is obtained, the servo motor is controlled to approximate the electromagnetic attraction force to the electromagnetic attraction force required by the corresponding 0 ° angle, and the electromagnetic attraction force is balanced to the axial separation force sum in each compression cavity of the scroll compressor. And further adjusting the electromagnetic force, and monitoring the exhaust flow of the scroll machine and the current of the spindle motor in real time. And controlling the magnitude of electromagnetic force according to the magnitude of the exhaust flow and the current of the spindle motor.
Specifically, in one preferred embodiment of the present invention, a current bisected angle interval is obtained, the servo electromagnetic mechanism is controlled to generate an initial value in the current bisected angle interval according to the electromagnetic force "original theoretical target curve", the servo motor is further controlled to increase the electromagnetic force, and the current exhaust flow of the scroll machine and the current of the spindle motor are monitored in real time, if the exhaust flow is increased, the "actual electromagnetic force" of the current angular interval is further increased by increasing the "value of the tracking target" of the current interval, and the exhaust flow and the current of the spindle motor in the equant angle interval are monitored in real time under the condition that the electromagnetic force is continuously increased, if the exhaust flow is continuously increased, the "value of the tracking target" in the current interval continues to be increased to further increase the "actual electromagnetic force" in the bisector angle interval until the exhaust flow volume remains unchanged or decreases. Under the condition that the electromagnetic force is continuously increased, the movable scroll disk of the scroll machine continuously moves towards the fixed scroll disk, the exhaust flow is continuously increased along with the reduction of the moving distance, when the exhaust flow is kept unchanged or reduced, the movable scroll disk and the fixed scroll disk of the scroll machine are possibly in a state of being close to each other, whether the current of the main shaft motor is increased is further judged, if yes, the overvoltage state exists between the movable scroll disk and the fixed scroll disk of the scroll machine, and the current of the main shaft motor is increased due to the fact that the overvoltage state exists, and the current of the main shaft motor can be well judged by measuring the current of the main shaft motor and the exhaust flow. When the scroll machine has an overpressure state, the last tracking target value is the true value closest to the most adaptive electromagnetic force target curve. The real value is stored as a value of the target electromagnetic force curve in the angular division interval and as a tracking target value in the angular division interval during the later operation.
If the displacement of the scroll compressor is continuously increased, namely a certain space exists between the movable scroll and the fixed scroll of the scroll, the electromagnetic force of the current equal-division angle interval needs to be continuously increased until an overpressure phenomenon exists. The "value of the tracking target" determined in the last halved angle interval is used as the "actual target value" as the value of the tracking target curve in the halved angle interval, and is used as the tracking target value in the halved angle interval in the later operation.
After the actual tracking target value of the current equant angle interval is obtained, a theoretical electromagnetic force tracking target value corresponding to the initial angle of the next equant angle interval is further obtained, the theoretical electromagnetic force tracking target value can be directly called according to an original theoretical target curve of the electromagnetic force obtained through calculation, the servo electromagnetic mechanism is further controlled to enable the electromagnetic force to approach the electromagnetic force theoretical tracking target value of the initial angle of the next equant angle interval, the current size and the exhaust flow of the spindle motor in the next equant angle interval are monitored in real time, and the actual electromagnetic force tracking target value corresponding to the next equant angle interval is obtained after circulation. And further circulating until all the original theoretical tracking target values of the electromagnetic force in the equally divided angle intervals are detected to form a complete 'most adaptive target electromagnetic force curve' serving as a 'target electromagnetic force curve'.
In another preferred embodiment of the present invention, after the electromagnetic force of the current bisected angle interval at the initial stage is set according to the original theoretical target curve of the electromagnetic force, and the electromagnetic force of the current bisected angle interval is increased by increasing the "tracking target value" of the current bisected interval, if the exhaust flow rate of the scroll machine remains unchanged, the electromagnetic force of the current bisected angle interval needs to be reduced by reducing the "tracking target value" of the current interval, if the exhaust flow rate of the scroll machine remains unchanged, the electromagnetic force of the current bisected angle interval continues to be reduced by continuously reducing the "tracking target value" of the current interval until the exhaust flow rate is reduced, it is determined that the scroll machine is in the leakage state, and the "tracking target value" of the previous interval is used as the "new target tracking value" of the current interval. After the calibration of the target electromagnetic force curve of the electromagnetic force in the current equant angle interval is finished, the calibration of the electromagnetic force tracking target in the next equant angle interval is further executed circularly until the original theoretical target curve of the electromagnetic force in all the equant angle intervals is detected, and then a target electromagnetic force curve which is most suitable for the scroll machine is formed and is used as a target electromagnetic force curve.
After the tracing curve of the electromagnetic probe is completed, the target electromagnetic force curve is used as the target to implement the advanced PID tracking algorithm to output the actual electromagnetic force, please refer to fig. 6, it can be seen that the actual axial separating force curve and the actual electromagnetic force curve output by the electromagnetic servo system through the target electromagnetic force curve after tracking calibration have higher coincidence, thereby showing that the probe tracing adopted by the invention has better calibration and optimization tracing effects.
For the technical effect of the invention, the invention uses the advanced PID algorithm to the actual electromagnetic force curve, and then does not carry out integral calibration to the original theoretical target curve, but divides the rotation angle of the spindle motor into n equal angle sections by 360 degrees, and adopts the algorithm idea of step-by-step approximation to carry out individual calibration to each angle section, so that the theoretical curve in each section gradually approximates to the actually required curve, thereby improving the calculation precision. The air displacement of the scroll machine and the current of the spindle motor are introduced to serve as calibration judgment indexes, the air displacement of the scroll machine and the current of the spindle motor are detected in real time, and compared with the last optimization cycle, the optimization condition is judged according to the judgment, and the control precision is higher. The invention makes the electromagnetic curve of the tracked target tracked by the electromagnetic servo system closer to the actual electromagnetic curve. The control precision of the electromagnetic servo system is further improved, the axial force of the scroll machine is balanced better, and the axial sealing performance of the scroll machine is effectively improved. Under the complex working condition, various factors act on an actual controlled device, so that the difference between an ideal scroll machine axial force curved surface and a curve model and an actual system is large.
In particular, according to the embodiments of the present disclosure, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium. The computer program, when executed by a Central Processing Unit (CPU), performs the above-described functions defined in the method of the present application. It should be noted that the computer readable medium mentioned above in the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wire segments, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless segments, wire segments, fiber optic cables, RF, etc., or any suitable combination of the foregoing.
It will be understood by those skilled in the art that the embodiments of the present invention described above and illustrated in the accompanying drawings are illustrative only and not restrictive of the broad invention, and that the objects of the invention have been fully and effectively achieved and that the functional and structural principles of the present invention have been shown and described in the embodiments and that modifications and variations may be resorted to without departing from the principles described herein.
Claims (11)
1. A method of tracking axial force of a scroll machine, the method comprising the steps of:
arranging an electromagnetic probe in the vortex machine to obtain the electromechanical magnetic force parameters of the vortex machine;
establishing an original theoretical target curve of the electromagnetic force, and carrying out electromagnetic force tracking control by taking the original theoretical target curve as a target;
acquiring the exhaust flow of the scroll machine and the current of a spindle motor when tracking an original theoretical target curve;
partitioning, namely acquiring the initial magnitude of electromagnetic force in a partition one by one, recording the exhaust flow and the current magnitude of a spindle motor, and analyzing the feedback exhaust flow and the change rule of a spindle motor current signal;
and correcting the electromagnetic force target values among the partitions one by one according to the feedback exhaust flow and the change rule of the current signal of the spindle motor to generate a new 'target electromagnetic force curve' which is most adaptive.
2. The method of claim 1, wherein n angular intervals are provided, wherein each angular interval has an angle of 360/n, and wherein the tracking operation of the target electromagnetic force curve is performed during each angular interval when the system is started.
3. The method of claim 2, wherein after startup, an early tracking PID control method is performed to approximate the "actual electromagnetic force curve" to the "target electromagnetic force curve".
4. The method of claim 2, wherein said method of finding said "target electromagnetic force profile" comprises the steps of: when entering into the adjacent subareas, the electromagnetic force needing to be tracked and calibrated is firstly set as the value of the original theoretical target curve corresponding to the electromagnetic force between the subareas.
5. The method of claim 4, wherein said method of finding said "target electromagnetic force profile" comprises the steps of: after the tracking of the electromagnetic force value approaching the target partition is executed, the actual electromagnetic force value of the current partition is further increased by increasing the electromagnetic force value tracking the target in the current partition, the current size of the spindle motor and the exhaust flow of the scroll machine in the time period corresponding to the partition are obtained, the exhaust flow and the size change of the spindle motor are judged, the approaching degree of the current electromagnetic force and the actually required target axial separating force or the corresponding target electromagnetic force is judged according to the exhaust flow and the size change of the spindle motor, the electromagnetic force value of a target electromagnetic force curve between the partitions is obtained, the value of an original theoretical target curve between the partitions is corrected by the target electromagnetic force curve, and the target electromagnetic force curve is further close to the actual target curve.
6. The tracking method for the axial force of the scroll machine according to claim 5, characterized in that after exhaust flow data of the scroll machine is collected, whether the exhaust flow is increased is judged, if so, the electromagnetic force between the sub-areas is continuously increased, and the current of the spindle motor and the exhaust flow of the scroll machine corresponding to the sub-areas are monitored in real time; if the air flow is continuously increased under the condition of continuously increasing the electromagnetic force of the subarea, the electromagnetic force value of the tracking target in the current subarea is continuously increased, and the electromagnetic force value of the tracking target is controlled to be increased by the actual electromagnetic force to dynamically track the tracking target in real time.
7. The method as claimed in claim 6, wherein if the exhaust flow rate is kept unchanged or decreased while the electromagnetic force of the current partition is continuously increased, then determining whether the spindle motor current is increased, if so, determining that the scroll machine under the current electromagnetic force is in an axial overvoltage state, and using the "electromagnetic force value of the tracking target" determined last time in the partition as the "value of the target electromagnetic force curve in the partition" as the tracking target value in the partition during the later operation.
8. The method of claim 6, wherein if the current inter-partition electromagnetic force is continuously increased and the current spindle motor current is kept constant or decreased, the current inter-partition electromagnetic force is further increased by increasing the current inter-partition tracking target value.
9. The method according to claim 5, wherein if the exhaust flow is detected to be kept unchanged, the actual electromagnetic force between the current sub-areas is continuously reduced by continuously reducing the value of the tracking target between the current sub-areas, the exhaust flow of the scroll machine corresponding to the sub-areas is monitored in real time, if the exhaust flow is reduced, the scroll machine is judged to be in a leakage state, and the value of the tracking target between the previous sub-areas is taken as the value of the actual target curve between the sub-areas.
10. A scroll axial force tracking system, wherein the system employs a scroll axial force tracking method as claimed in any one of claims 1 to 9.
11. A scroll machine employing a method of tracking axial force of a scroll machine as claimed in any one of claims 1 to 9.
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| CN110107503A (en) * | 2019-05-30 | 2019-08-09 | 浙江科技学院 | A kind of scroll machine and its electromagnetic mechanism |
| CN110185616A (en) * | 2019-05-30 | 2019-08-30 | 浙江科技学院 | The electromagnetism air gap optimization method of scroll machine and its electromagnetic mechanism and electromagnetic mechanism |
| CN110822050A (en) * | 2019-11-26 | 2020-02-21 | 奇瑞汽车股份有限公司 | Power transmission system |
| CN110925197A (en) * | 2019-12-06 | 2020-03-27 | 浙江科技学院 | Scroll machine, axial back pressure dynamic control method thereof and storage medium |
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