CN107725591B - System and method for correcting suspension center position of magnetic suspension bearing - Google Patents
System and method for correcting suspension center position of magnetic suspension bearing Download PDFInfo
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- CN107725591B CN107725591B CN201710815148.4A CN201710815148A CN107725591B CN 107725591 B CN107725591 B CN 107725591B CN 201710815148 A CN201710815148 A CN 201710815148A CN 107725591 B CN107725591 B CN 107725591B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0493—Active magnetic bearings for rotary movement integrated in an electrodynamic machine, e.g. self-bearing motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2231/00—Running-in; Initial operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/20—Application independent of particular apparatuses related to type of movement
- F16C2300/22—High-speed rotation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2320/00—Apparatus used in separating or mixing
- F16C2320/42—Centrifuges
Abstract
The invention provides a method and a system for correcting the suspension center position of a magnetic suspension bearing, wherein the method comprises the following steps: detecting characteristic values of electromagnetic force on two sides of a stopping push disc of the magnetic suspension centrifugal machine; evaluating the detected characteristic value and selecting a correction amount deltaz according to the evaluation result; and adjusting the position of the axial suspension center Zref according to the correction quantity delta z.
Description
Technical Field
The invention relates to a system and a method for correcting the suspension center position of a magnetic suspension bearing.
Background
the magnetic suspension centrifugal machine adopts two radial magnetic suspension bearings and one axial magnetic suspension bearing to support the rotating shaft, works in an oil-free and friction-free state, and has the advantages of high speed, no maintenance and the like. The motor rotor of the magnetic suspension centrifuge is assembled on the shaft, and the motor stator is assembled on the shell of the compressor. Before the magnetic suspension centrifuge is started, the magnetic suspension center position is usually determined for the electromagnetic bearing to ensure that the thrust disk is suspended in a force balance manner at the geometric center of the axial bearing.
However, the condition of the motor stator and rotor assembly misalignment is ignored in the conventional detection. Due to the reasons of part processing errors, assembly processes and the like, the superposition of the central lines of the stator and the rotor of the motor in the vertical direction is difficult to ensure when the motor is assembled, so that the situation of axial misalignment of the stator and the rotor occurs. As shown in fig. 1, where there is a significant positional deviation between the centerline of the stator and the rotor centerline. If the axial suspension center is not properly selected, the magnetic suspension centrifuge will generate a pulling force in the axial direction (axial misalignment pulling force for short) due to the misalignment during high-speed rotation.
The axial misalignment pulling force generated by such misalignment also acts on the axial bearing, and it can be understood that there are 3 forces acting on the thrust disk, and the specific stress analysis is shown in fig. 3, where F1 and F2 are axial 1 and axial 2 electromagnetic forces, and F3 is the axial misalignment pulling force generated by misalignment of the stator and the rotor of the motor, and once the assembly is completed, F3 does not change substantially, and only by adjusting F1 and F2, the stress balance of the axial bearing can be realized, which increases the control complexity of the axial bearing.
The control influence of the non-centering pull force on the axial magnetic suspension bearing is large, the rotor instability can be caused under severe conditions, and the reliability of the magnetic suspension centrifugal machine is reduced.
disclosure of Invention
the invention aims to provide a method for correcting the suspension center position of a magnetic suspension centrifuge and a system for correcting the suspension center position, so that axial misalignment pulling force generated by misalignment of a stator and a rotor can be effectively eliminated, the control complexity of an axial magnetic suspension bearing is reduced, and the stability of the magnetic suspension centrifuge can be improved.
The invention aims to provide a method for correcting the suspension center position of a magnetic suspension bearing. The correction method comprises the following steps: detecting characteristic values of electromagnetic force on two sides of a stopping push disc of the magnetic suspension centrifugal machine; and evaluating the detected characteristic value, selecting a correction quantity delta z according to an evaluation result, and adjusting the position of the axial suspension center Zref according to the correction quantity delta z.
Optionally, before detecting the characteristic value of the electromagnetic force on the two sides of the stopping push disk of the magnetic suspension centrifuge, the method according to the present invention further comprises: acquiring the position of an axial suspension center; and positions the thrust disk at the axial center of levitation. And respectively detecting the maximum displacement and the minimum displacement of the thrust disc when the axial suspension center is obtained. And acquiring the average value of the maximum displacement and the minimum displacement as the axial suspension center, so that the thrust disc is positioned at the geometric center of the axial bearing.
Alternatively, when the thrust disk is located at the geometric center position of the axial bearing, a characteristic value that characterizes the electromagnetic force on both sides of the thrust disk is detected. Preferably, the first axial levitating current IZ1 is detected on one side of the thrust disk and the second axial levitating current IZ2 is detected on the other side of the thrust disk.
Optionally, in the correction method according to the present invention, the evaluating the detected feature value includes: carrying out difference operation on IZ1 and IZ2 to obtain a difference value; comparing the absolute value of the difference value with a preset threshold value; selecting a correction amount Δ z according to the evaluation result, including: and determining a correction amount corresponding to the comparison result according to the comparison result.
Optionally, when the comparison result indicates that the absolute value is greater than the preset threshold, the difference between the obtained axial levitation center and the correction amount is used as the corrected axial levitation center, and the position of the axial levitation center is adjusted according to the corrected axial levitation center. Stopping the process of correcting the axial suspension center when the comparison result indicates that the absolute value is smaller than the preset threshold value
Optionally, the position of the thrust disk is adjusted to the corrected axial levitation center, and the axial levitation currents on both sides of the thrust disk are again detected and evaluated. If the re-detected axial levitation current still does not meet the evaluation criteria, the above evaluation and correction process is repeated until the absolute value of IZ1-IZ2 is less than the threshold.
The above object of the present invention is also to provide a system for correcting the suspension center position of a magnetic suspension bearing, comprising: the sensor is used for detecting a characteristic value, and the characteristic value is used for representing the electromagnetic force on two sides of the stopping push disc of the magnetic suspension centrifugal machine; the control device is connected with the magnetic suspension centrifugal machine and used for acquiring an axial suspension center, evaluating the detected characteristic value and determining a preset correction amount according to an evaluation result; and the magnetic bearing in the magnetic suspension centrifugal machine is used for adjusting the center position according to the correction amount.
optionally, the sensor includes an axial levitating current sampler that detects a first axial levitating current on one side of the thrust disk and a second axial levitating current IZ2 on the other side of the thrust disk.
The control device of the correction system according to the invention is connected to the magnetic levitation centrifuge in a wired or wireless manner, so that the control device can receive data from the magnetic levitation centrifuge and send control signals to the magnetic levitation centrifuge. The control device can be arranged flexibly, i.e. it can be arranged outside the magnetic levitation centrifuge or on the device. The correction system may further comprise an axial displacement sensor for detecting displacement of the thrust disk and transmitting the detected displacement to the control device.
The invention also relates to a storage medium in which a program code for carrying out the method according to the invention for correcting the levitation center position of a magnetic bearing is stored.
According to the embodiment of the invention, the characteristic values of the electromagnetic forces on the two sides of the thrust disk are detected and evaluated, so that the correction quantity is obtained according to the evaluation result, and the misalignment tension is eliminated only by considering the factor of the electromagnetic force, so that the axial misalignment tension generated by misalignment of the stator and the rotor can be effectively eliminated, the control complexity of the axial magnetic suspension bearing is reduced, and the stability of the magnetic suspension centrifuge can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a stator and rotor installation misalignment in the related art;
FIG. 2 is a schematic diagram of a magnetic levitation centrifuge according to an embodiment of the present invention;
FIG. 3 is an axial force analysis diagram of a stator and rotor installation misalignment condition according to an embodiment of the invention;
FIG. 4 is a flow chart of a method of correcting a position of a floating center according to an embodiment of the present invention;
FIG. 5 is a detailed flow chart of a method of correcting the position of the floating center according to an embodiment of the present invention;
Fig. 6 is a block diagram of a system for correcting the position of the levitation center 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.
as shown in fig. 1, when assembling a magnetic levitation centrifuge, a slight displacement is generally formed between the stator center line and the rotor center line due to an assembly process and a machining error. Due to this slight displacement, additional tensile forces are generated in both axial directions, i.e. in both electromagnetic bearings.
As shown in fig. 3, after the thrust disk is statically located at the axial center of levitation, which is conventionally measured, it is not in force equilibrium due to the additional tensile force. Specifically, the thrust disk now receives two tensile forces, i.e., F1 and F3, in the axial 1 direction, and the thrust disk receives one tensile force F2 in the axial 2 direction. It can be seen from the force analysis that the rotor may move slightly because it is not in force balance, and under the worst condition, the unbalance of force will cause the rotor to be unstable, thereby reducing the reliability of the magnetic suspension centrifuge.
The embodiment of the invention provides a method for correcting the suspension center position of a magnetic suspension bearing. As shown in fig. 4, the method for correcting the levitation center position of the magnetic bearing according to the present invention comprises the following steps:
Step S402, detecting the characteristic value of the electromagnetic force on the two sides of the stopping push disk of the magnetic suspension centrifuge;
optionally, the characteristic values include, but are not limited to: a first axial levitating current IZ1 detected on one side of the thrust disk and a second axial levitating current IZ2 detected on the other side of the thrust disk.
Optionally, before executing step S402, the position of the axial levitation center may also be acquired; and positioning the thrust disk at the axial levitation center. In this way, the axial suspension center can be adjusted during assembly. Wherein, obtaining the position of the axial suspension center can be obtained through a calculation process: detecting a maximum displacement of the thrust disk; detecting a minimum displacement of the thrust disk; and calculating the average value of the maximum displacement and the minimum displacement, and taking the average value as the axial suspension center.
Step S404, evaluating the detected characteristic value, and selecting a correction amount delta z according to the evaluation result;
In an alternative embodiment, the detected characteristic value may be evaluated in the following manner, but is not limited thereto: carrying out difference operation on the IZ1 and the IZ2 to obtain a difference value; comparing the absolute value of the difference value with a preset threshold value; at this time, the correction amount Δ z may be selected by: and determining a correction amount deltaz corresponding to the comparison result according to the comparison result.
In step S406, the position of the axial levitation center Zref is adjusted according to the correction amount Δ z. Optionally, when the comparison result indicates that the absolute value is greater than a preset threshold, the obtained difference between the axial levitation center and the correction amount is used as a corrected axial levitation center, and the position of the axial levitation center is adjusted according to the corrected axial levitation center.
In an alternative embodiment of the present invention, step S406 may be implemented by: and adjusting the position of the thrust disc to the corrected axial levitation center, so that the absolute value of the difference between the first axial levitation current and the second axial levitation current which are detected again is smaller than the preset threshold.
In order to save operating resources, in an alternative embodiment, the process of correcting the axial levitation center is stopped when the comparison result indicates that the absolute value is smaller than a preset threshold value.
Fig. 5 shows in detail the correction method for the levitation center position of the magnetic bearing.
In step S501 of the correction method, the system is powered on. In step S502, that is, after the system is powered on, the axial levitation center position is detected by a conventional method. Here, the thrust disk is first positioned to axial 1, the maximum displacement Zmax is read by the axial displacement sensor, and then the thrust disk is positioned to axial 2, the minimum displacement Zmin is read by the axial displacement sensor. The axial displacement sensor sends the detected displacement to the control device. Finally, the control device calculates the center position Zref that needs to be suspended in the axial direction as (Zmax + Zmin)/2.
then, in step S503, the floating shaft is performed according to the flow shown in fig. 2, that is, the thrust disk is located at the calculated axial floating center position Zref by the control device, so that the distance d1 between the thrust disk and the axial direction 1 is equal to the distance d2 between the thrust disk and the axial direction 2, that is, d1 is equal to d2, and the thrust disk is guaranteed to be suspended at the geometric center position of the axial bearing.
In the case of a floating shaft, the thrust disk is subjected to three forces, for example as shown in fig. 3, and is therefore displaced, since the stator center line is not aligned with the rotor center line.
At this time, a characteristic value characterizing the electromagnetic force acting on both sides of the thrust disk is detected using a sensor in step S504. In principle, the sensor can be an axial levitation current sampler for sampling the axial levitation currents IZ1, IZ2 on one side and on the other side of the thrust disk. Furthermore, it is also conceivable for the correction system to comprise further sensors which can likewise detect the electromagnetic force directly or indirectly in order to determine the electromagnetic force on both sides of the thrust disk.
The detected axial levitation currents IZ1, IZ2 are sent to the control means and evaluated. With the effect of F3, IZ1< IZ 2. If F3 is large enough, the deviation between IZ1 and IZ2 is too large to facilitate the control of the axial bearing, and the difference between IZ1 and IZ2 can be reduced by correcting the position of the axial suspension center. A predetermined correction amount az is selected on the basis of the detected first and second axial levitation currents IZ1, IZ2 and is sent to the control device to correct the axial levitation center.
in evaluating the axial levitation current to correct the neutral position: firstly, judging whether the absolute value of IZ1-IZ2 is less than 0.15, if so, not correcting the current axial suspension center Zref, and recording the current axial suspension center Zref as a corrected axial suspension center position Zref _ xz; when IZ1-IZ2< -0.15, the corrected axial levitation center position Zref _ xz should be Zref _ xz ═ Zref + Δ z, where Zmin < Zref + Δ z < Zmax, where the correction Δ z is a positive value; when IZ1-IZ2>0.15, the corrected axial levitation center position Zref _ xz should be Zref _ xz, Zref- Δ z, where Zmin < Zref- Δ z < Zmax, where the correction Δ z is a negative value. The adjustment range of the predetermined correction amount Δ z in the above formula varies in value from 0 to Zref/2, and can be automatically calculated by software.
the position of the thrust disk is adjusted by the control device to be located at the corrected axial levitation center position Zref _ xz. Subsequently, the foregoing evaluation process is repeated until the absolute values of IZ1-IZ2 are finally made within 0.15 by the correction, whereby the thrust disk is in force balance.
in step S505, a qualified axial levitation center Zref _ xz is recorded when the absolute value of IZ1-IZ2 meets the aforementioned criteria.
Finally, the correction is ended in step S506.
fig. 6 is a block diagram of a system for correcting the position of the levitation center according to an embodiment of the present invention. As shown in fig. 6, the system includes: a sensor 60 for detecting a characteristic value, wherein the characteristic value is used for representing the electromagnetic force on two sides of the stopping push disk of the magnetic suspension centrifuge; a control device 62 connected to the magnetic levitation centrifuge 64 for obtaining an axial levitation center, the control device evaluating the detected characteristic value and determining a predetermined correction amount based on the evaluation result; and a magnetic bearing 66 in the magnetic suspension centrifuge is used for adjusting the center position according to the correction quantity.
Optionally, the sensor includes an axial levitating current sampler that detects a first axial levitating current on one side of the thrust disk and a second axial levitating current IZ2 on the other side of the thrust disk.
An embodiment of the present invention also provides a storage medium in which a program code for executing the method for correcting the levitation center position of a magnetic bearing according to the present invention is stored.
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 above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for correcting the suspension center position of a magnetic suspension bearing is characterized by comprising the following steps:
Detecting characteristic values of electromagnetic force on two sides of a stopping push disc of the magnetic suspension centrifugal machine; wherein the characteristic values include: a first axial levitating current IZ1 detected on one side of a thrust disk and a second axial levitating current IZ2 detected on the other side of the thrust disk;
Evaluating the detected characteristic value and selecting a correction amount deltaz according to the evaluation result;
And adjusting the position of the axial suspension center Zref according to the correction quantity delta z.
2. The correction method according to claim 1,
Evaluating the detected feature values comprises: carrying out difference operation on the IZ1 and the IZ2 to obtain a difference value; comparing the absolute value of the difference value with a preset threshold value;
selecting a correction amount Δ z according to the evaluation result, including: and determining a correction amount deltaz corresponding to the comparison result according to the comparison result.
3. The correction method according to claim 2, wherein adjusting the position of the axial levitation center in accordance with the correction amount Δ z includes:
And when the comparison result indicates that the absolute value is greater than a preset threshold value, taking the difference between the obtained axial suspension center and the correction amount as a corrected axial suspension center, and adjusting the position of the axial suspension center according to the corrected axial suspension center.
4. The correction method according to claim 2, wherein adjusting the position of the axial levitation center in accordance with the correction amount Δ z includes:
And adjusting the position of the thrust disc to the corrected axial levitation center, so that the absolute value of the difference between the first axial levitation current and the second axial levitation current detected again is smaller than the preset threshold.
5. The correction method according to claim 2, characterized in that the method further comprises: and stopping the correction process of the axial suspension center when the comparison result indicates that the absolute value is smaller than a preset threshold value.
6. the correction method according to claim 1, wherein before detecting the characteristic value of the electromagnetic force on both sides of the stopping pad of the magnetic suspension centrifuge, the method further comprises:
Acquiring the position of the axial suspension center; and positioning the thrust disk at the axial levitation center.
7. The correction method according to claim 6, characterized in that it comprises, in acquiring the position of the axial levitation center, the steps of:
Detecting a maximum displacement of the thrust disk;
Detecting a minimum displacement of the thrust disk;
And calculating the average value of the maximum displacement and the minimum displacement, and taking the average value as the axial suspension center.
8. A system for correcting the suspension center position of a magnetic suspension bearing comprises:
A sensor for detecting a characteristic value for representing the electromagnetic force on the two sides of the stopping push disk of the magnetic suspension centrifugal machine,
The control device is connected with the magnetic suspension centrifugal machine and used for acquiring an axial suspension center, and the control device evaluates the detected characteristic value and determines a preset correction according to an evaluation result;
And the magnetic bearing in the magnetic suspension centrifugal machine is connected with the control device and used for adjusting the central position according to the correction amount.
9. the correction system according to claim 8, wherein the sensor comprises: the axial suspension current sampler is used for detecting a first axial suspension current on one side of the thrust disk and a second axial suspension current on the other side of the thrust disk.
10. A computer-readable storage medium in which a program code for executing the method for correcting the levitation center position of a magnetic levitation bearing according to any one of claims 1 to 7 is stored.
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| CN201710815148.4A CN107725591B (en) | 2017-09-11 | 2017-09-11 | System and method for correcting suspension center position of magnetic suspension bearing |
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| CN108757732B (en) * | 2018-08-06 | 2023-10-03 | 珠海格力电器股份有限公司 | Magnetic bearing control apparatus, method, and storage medium |
| CN109538630A (en) * | 2018-12-03 | 2019-03-29 | 珠海格力电器股份有限公司 | Motor magnetic suspension bearing control device, control method, motor and compressor |
| CN110985543B (en) * | 2019-12-09 | 2020-11-17 | 珠海格力电器股份有限公司 | Magnetic suspension bearing control method and device, magnetic suspension bearing and compressor |
| CN114135580B (en) * | 2021-11-04 | 2022-07-26 | 珠海格力电器股份有限公司 | Position evaluation method and device for magnetic bearing rotor |
| CN114607702B (en) * | 2022-03-15 | 2023-02-24 | 珠海格力电器股份有限公司 | Control method and device of magnetic suspension system, magnetic suspension system and storage medium |
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| CN105509684A (en) * | 2015-11-24 | 2016-04-20 | 珠海格力节能环保制冷技术研究中心有限公司 | Detection method, apparatus, and system for axial displacement |
| CN105486223A (en) * | 2016-02-16 | 2016-04-13 | 珠海格力节能环保制冷技术研究中心有限公司 | Coaxiality detecting method of hybrid magnetic bearings |
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