CN104457649A - Shaft detection method and device for magnetic suspension system - Google Patents
Shaft detection method and device for magnetic suspension system Download PDFInfo
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- CN104457649A CN104457649A CN201310416439.8A CN201310416439A CN104457649A CN 104457649 A CN104457649 A CN 104457649A CN 201310416439 A CN201310416439 A CN 201310416439A CN 104457649 A CN104457649 A CN 104457649A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
- G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
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Abstract
The invention discloses a shaft detection method and a device for a magnetic suspension system. The shaft detection method for the magnetic suspension system comprises steps that, a displacement of a shaft deviating from the center position in the magnetic suspension system is detected; whether a fault that the shaft bumps a protection bearing exists is determined according to the detection result; when the fault that the shaft bumps the protection bearing exists is determined, a motor in the magnetic suspension system is controlled to stop rotation. Through the shaft detection method, the magnetic suspension system can be avoided from being damaged.
Description
Technical field
The present invention relates to magnetic levitation field, in particular to the shaft detection method and apparatus in a kind of magnetic suspension system.
Background technology
Magnetic suspension bearing is generally all applied in High Rotation Speed occasion, very high to the reliability requirement of magnetic suspension bearing.Axle likely can produce the fault of axle crash protection bearing in rotary course, after the fault producing axle crash protection bearing, if motor continues to rotate, easily damages magnetic suspension system.Inventor finds, the fault of axle crash protection bearing is one of fault that magnetic bearing system may be caused to damage, but, in the prior art, the fault of axle crash protection bearing is not detected, thus cause magnetic suspension system easily to damage.
Hold flimsy problem for magnetic suspension system in prior art, not yet propose effective solution at present.
Summary of the invention
Fundamental purpose of the present invention is to provide the method and apparatus of the shaft detection in a kind of magnetic suspension system, holds flimsy problem to solve magnetic suspension system.
To achieve these goals, according to an aspect of the present invention, a kind of shaft detection method in magnetic suspension system is provided.
Comprise according to the shaft detection method in magnetic suspension system of the present invention: detect the displacement that magnetic suspension system axis departs from center; The fault that there is axle crash protection bearing is judged whether according to testing result; And when judging the fault that there is axle crash protection bearing, the motor controlled in magnetic suspension system stops the rotation.
Further, detect the displacement that magnetic suspension system axis departs from center to comprise: depart from the displacement of center at interval of the first schedule time detection axis in X-direction and depart from the displacement of center in the Y direction; And the displacement departing from center in X-direction according to axle and the displacement that departs from center in the Y direction calculate axle and depart from the displacement of center.
Further, judge whether that the fault that there is axle crash protection bearing comprises according to testing result: judge whether the displacement that axle departs from center is greater than predetermined threshold; And when the displacement judging that shaft departs from center is greater than predetermined threshold, determine the fault that there is axle crash protection bearing.
Further; judge whether displacement that axle departs from center is greater than predetermined threshold and comprises: judge whether the displacement that secondary axes depart from center is greater than predetermined threshold at interval of the second Preset Time; when the displacement judging that shaft departs from center is greater than predetermined threshold; determine that the fault that there is axle crash protection bearing comprises: when the number of times judging that continuously displacement that shaft departs from center is greater than predetermined threshold is greater than preset times, determine the fault that there is axle crash protection bearing.
Further, predetermined threshold is determined in the following manner: respectively detection axis is in X-direction and the movable maximal value of Y-direction and minimum value; And process is weighted to the maximal value detected and minimum value, calculate predetermined threshold.
To achieve these goals, according to a further aspect in the invention, the shaft detection device in a kind of magnetic suspension system is provided.
Comprising according to the shaft detection device in magnetic suspension system of the present invention: detecting unit, departing from the displacement of center for detecting magnetic suspension system axis; Judging unit, for judging whether the fault that there is axle crash protection bearing according to testing result; And control module, for when judging the fault that there is axle crash protection bearing, the motor controlled in magnetic suspension system stops the rotation.
Further, detecting unit comprises: detection module, for departing from the displacement of center at interval of the first schedule time detection axis in X-direction and departing from the displacement of center in the Y direction; And computing module, calculate axle for the displacement that departs from center in X-direction according to axle and the displacement that departs from center in the Y direction and depart from the displacement of center.
Further, judging unit comprises: judge module, for judging whether the displacement that axle departs from center is greater than predetermined threshold; And determination module, during for being greater than predetermined threshold in the displacement judging that shaft departs from center, determine the fault that there is axle crash protection bearing.
Further; judge module is used for judging whether the displacement that secondary axes depart from center is greater than predetermined threshold at interval of the second Preset Time; determination module is used for, when the number of times judging that continuously displacement that shaft departs from center is greater than predetermined threshold is greater than preset times, determining the fault that there is axle crash protection bearing.
Further, judge module is used for determining predetermined threshold in the following manner: respectively detection axis is in X-direction and the movable maximal value of Y-direction and minimum value; And process is weighted to the maximal value detected and minimum value, calculate predetermined threshold.
Pass through the present invention; adopt the displacement detecting magnetic suspension system axis and depart from center; and judge whether according to testing result the fault that there is axle crash protection bearing; and when judging the fault that there is axle crash protection bearing; the motor controlled in magnetic suspension system stops the rotation; detect the method for magnetic suspension system axis crash protection bearing, solve magnetic suspension system and hold flimsy problem, and then reach the effect avoiding magnetic suspension system to damage.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the magnetic suspension bearing according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the shaft detection device in magnetic suspension system according to a first embodiment of the present invention;
Fig. 3 is the schematic diagram of the shaft detection device in magnetic suspension system according to a second embodiment of the present invention;
Fig. 4 is the schematic diagram of the shaft detection device in magnetic suspension system according to a third embodiment of the present invention;
Fig. 5 is the process flow diagram of the shaft detection method in magnetic suspension system according to a first embodiment of the present invention;
Fig. 6 is the process flow diagram of the shaft detection method in magnetic suspension system according to a second embodiment of the present invention;
Fig. 7 is the process flow diagram of the shaft detection method in magnetic suspension system according to a third embodiment of the present invention;
Fig. 8 is the process flow diagram of the shaft detection method in magnetic suspension system according to a fourth embodiment of the present invention;
Fig. 9 is time and the view that the displacement departing from center according to the continuous judgement shaft of the embodiment of the present invention is greater than predetermined threshold;
Figure 10 departs from the displacement of center and the time of predetermined threshold result and view according to the judgement axle of the embodiment of the present invention; And
Figure 11 is the process flow diagram stopped the rotation according to the motor in the control magnetic suspension system of the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein such as can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Fig. 1 is the schematic diagram of the magnetic suspension bearing according to the embodiment of the present invention.As shown in the figure, this magnetic suspension bearing comprises axle 1 and protection bearing 2.Wherein, axle 1 is positioned at protection bearing 2, can arrange multiple coil in the outside of protection bearing 2, and the magnetic force that the coil after being energized is produced can drive the axle in protection bearing to rotate, and axle is rotated at protection bearing inner suspension.Preferably, multiple coils of protection Bearing outer can be symmetrical arranged, and can ensure that axle suspends at the center of protection bearing and rotate.
In order to whether the axle detected in magnetic suspension system rotates in the center suspension of protection bearing, can also arrange multiple sensor 3 at protection Bearing outer, multiple sensor can be arranged on identical direction with multiple coil.X1, Y1, X2, Y2 in Fig. 1 represent a sensor respectively.
Fig. 2 is the schematic diagram of the shaft detection device in magnetic suspension system according to a first embodiment of the present invention.As shown in the figure, this pick-up unit comprises detecting unit 10, judging unit 20 and control module 30.
Detecting unit 10 departs from the displacement of center for detecting magnetic suspension system axis.Detect the displacement that magnetic suspension system axis departs from center, X-direction can be detected respectively and depart from the displacement that the displacement of center and Y-direction depart from center, then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate the displacement that magnetic suspension system axis departs from center.
Judging unit 20 is for judging whether the fault that there is axle crash protection bearing according to testing result.Axle departs from center in X-direction, then axle may collide protection bearing in the X direction, if axle departs from X-direction the threshold value that center reaches predetermined, then can think that axle collides protection bearing, exists the fault of axle crash protection bearing; Axle departs from center in the Y direction, then axle may collide protection bearing in the Y direction, if axle departs from the threshold value that center reaches predetermined in the Y direction, then can think that axle collides protection bearing, exists the fault of axle crash protection bearing.The fault judging whether to exist axle crash protection bearing according to testing result can also comprise and then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate after magnetic suspension system axis departs from the displacement of center; if the displacement that magnetic suspension system axis departs from center reaches predetermined threshold value; then can think that axle collides protection bearing, exists the fault of axle crash protection bearing.
Control module 30 is for when judging the fault that there is axle crash protection bearing, and the motor controlled in magnetic suspension system stops the rotation.In order to avoid damaging magnetic suspension system; when judging unit 20 judges the fault that there is axle crash protection bearing; control motor stalls in magnetic suspension system, thus the axle controlled in magnetic levitation bearing system stops operating, and makes the axle no longer crash protection bearing in magnetic levitation bearing system.
Pass through said method; the fault of axle crash protection bearing can be detected in time; and when the fault of axle crash protection bearing being detected, the motor controlled in magnetic suspension system stops the rotation, the damage that the fault avoiding axle crash protection bearing causes magnetic suspension system.
Fig. 3 is the schematic diagram of the shaft detection device in magnetic suspension system according to a second embodiment of the present invention.As shown in the figure, this pick-up unit comprises detecting unit 10, judging unit 20 and control module 30, and wherein, detecting unit 10 comprises detection module 101 and computing module 102.
It should be noted that, the judging unit 20 in embodiment illustrated in fig. 3 and control module 30 with embodiment illustrated in fig. 2 in judging unit 20 identical with control module 30 content, do not repeat at this.
Detection module 101 is for departing from the displacement of center at interval of the first schedule time detection axis in X-direction and departing from the displacement of center in the Y direction.Detection module 101 can be displacement transducer, can carry out detection axis depart from the displacement of center in X-direction and depart from the displacement of center in the Y direction by detecting position shifting signal.First schedule time can be the time experimentally calculated, such as 50us, 100us, 1ms etc.The displacement that detection module 101 detection axis departs from center in X-direction can be Err_X=X – Ref_X, and the displacement that axle departs from center in the Y direction can be Err_Y=Y – Ref_Y.Wherein, X is the actual displacement of axle in X-direction, and Y is axle actual displacement in the Y direction, Ref_X is the center of axle in X-direction, Ref_Y is axle center in the Y direction, and Err_X is that axle departs from the displacement of center in X-direction, and Err_Y is the displacement that axle departs from center in the Y direction.
Computing module 102 calculates axle for the displacement that departs from center in X-direction according to axle and the displacement that departs from center in the Y direction and departs from the displacement of center.After the displacement that detection module 101 detects the displacement that axle departs from center in X-direction and departs from center in the Y direction, the displacement Err_X that computing module 102 can depart from center according to axle in X-direction and the displacement Err_Y departing from center in the Y direction calculates the displacement that axle departs from center
wherein, Err_XY is the displacement that axle departs from center.
Fig. 4 is the schematic diagram of the shaft detection device in magnetic suspension system according to a third embodiment of the present invention.As shown in the figure, this pick-up unit comprises detecting unit 10, judging unit 20 and control module 30, and wherein, judging unit 20 comprises judge module 201 and determination module 202.
It should be noted that, the detecting unit 10 in embodiment illustrated in fig. 4 and control module 30 with embodiment illustrated in fig. 2 in detecting unit 10 identical with control module 30 content, do not repeat at this.
Whether judge module 201 is greater than predetermined threshold for the displacement judging axle and depart from center.After detecting unit 10 detects that axle departs from the displacement of center, judge module 201 can depart from displacement Err_XY and the predetermined threshold of center by comparing axle, judges whether the displacement that axle departs from center is greater than predetermined threshold.Predetermined threshold can experimentally draw by Data Summary, and preferably, in order to make the value of predetermined threshold more accurate, judge module can determine predetermined threshold in the following manner:
Respectively detection axis is in X-direction and the movable maximal value of Y-direction and minimum value.Because the internal diameter of protection bearing is limited; axle in magnetic bearing system is general all at about 100-500um with the gap of protection bearing; therefore predetermined threshold can be in the scope of such as 100-500um, axle X-direction can the maximal value (such as 450um) of action, minimum value (such as 50um) and axle in the Y direction can maximal value (such as 450um), the minimum value (such as 50um) of action.
Process is weighted to the maximal value detected and minimum value, calculates predetermined threshold.By the maximal value of action, minimum value and axle the maximal value of action, minimum value process can be weighted in the Y direction to the axle detected in X-direction, predetermined threshold can be calculated.This predetermined threshold can be the ultimate value that axle collides protection bearing.
When determination module 202 is for being greater than predetermined threshold in the displacement judging that shaft departs from center, determine the fault that there is axle crash protection bearing.When the displacement judging that shaft departs from center is greater than predetermined threshold, determination module 202 determines the fault that there is axle crash protection bearing, also just determines axle and collides protection bearing.
In order to judge whether the fault that there is axle crash protection bearing more accurately; further can determine by the judge module 201 in the shaft detection device in embodiment of the present invention magnetic suspension system and determination module 202 fault that there is axle crash protection bearing, judge module 201 and determination module 202 can determine the fault that there is axle crash protection bearing by the following method:
Whether judge module 201 is greater than predetermined threshold for the displacement judging secondary axes at interval of the second Preset Time and depart from center.Second Preset Time can be greater than the first Preset Time, and the second Preset Time can comprise multiple first Preset Time.In the second Preset Time, can detect that multiple axle obtained at interval of the first Preset Time departs from the displacement of center in X-direction and departs from the displacement of center in the Y direction.Judge module 201 can judge once to detect in the second Preset Time at interval of the second Preset Time the displacement that the multiple axles obtained depart from center and whether be greater than predetermined threshold.Such as, 100 the first Preset Times are had in the second Preset Time, in each second Preset Time, then there is the displacement that 100 axles depart from center, then to judge in this second Preset Time whether the displacement that 100 axle each axles departed from the displacement of center depart from center is greater than predetermined threshold at interval of the second Preset Time.
When determination module 202 is for being greater than preset times at the number of times judging that continuously displacement that shaft departs from center is greater than predetermined threshold, determine the fault that there is axle crash protection bearing.
If when the displacement that above-mentioned 100 axles depart from center judges that the number of times that displacement that shaft departs from center is greater than predetermined threshold is more than or equal to preset times continuously, determine the fault that there is axle crash protection bearing.If judge that continuously the number of times that displacement that shaft departs from center is greater than predetermined threshold is less than or equal to preset times, then by judged result clearing before, rejudge the number of times that displacement that axle departs from center is greater than predetermined threshold and whether be greater than preset times.Such as, when the continuous displacement judging that shaft departs from center for 5 times is greater than predetermined threshold, the fault that there is axle crash protection bearing is determined.If judge that the displacement that 4 secondary axes depart from center is greater than predetermined threshold continuously, and the displacement that the 5th axle departs from center is less than predetermined threshold, then again count when judging for the 6th time, the state of first 5 times is reset.Wherein, the value of preset times can be relevant with system architecture, rotating speed, load and experience; be 7 as in the magnetic suspension system of the embodiment of the present invention, the gyro frequency of motor can get preset times when 200Hz; reach reasonable Detection results, when can effectively avoid axle to collide, break protection bearing.
By judging that number of times that displacement that shaft departs from center is greater than predetermined threshold is greater than preset times to determine the method for the fault that there is axle crash protection bearing continuously; the breakdown judge that sampling error can be avoided to cause is inaccurate, thus improves the precision and accuracy that detect.
Embodiments of the invention additionally provide a kind of shaft detection method in magnetic suspension system.Shaft detection device in the magnetic suspension system that shaft detection method in the magnetic suspension system of the embodiment of the present invention can be provided by the embodiment of the present invention performs, and the shaft detection device in the magnetic suspension system of the embodiment of the present invention also may be used for performing the shaft detection method in the magnetic suspension system that provides of the embodiment of the present invention.
Below in conjunction with accompanying drawing, the shaft detection method in magnetic suspension system is described in detail, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Fig. 5 is the process flow diagram of the shaft detection method in magnetic suspension system according to a first embodiment of the present invention.As shown in Figure 5, the method comprises the steps:
Step S501, detects the displacement that magnetic suspension system axis departs from center.Detect the displacement that magnetic suspension system axis departs from center, X-direction can be detected respectively and depart from the displacement that the displacement of center and Y-direction depart from center, then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate the displacement that magnetic suspension system axis departs from center.
Step S502, judges whether according to testing result the fault that there is axle crash protection bearing.Axle departs from center in X-direction, then axle may collide protection bearing in the X direction, if axle departs from X-direction the threshold value that center reaches predetermined, then can think that axle collides protection bearing, exists the fault of axle crash protection bearing; Axle departs from center in the Y direction, then axle may collide protection bearing in the Y direction, if axle departs from the threshold value that center reaches predetermined in the Y direction, then can think that axle collides protection bearing, exists the fault of axle crash protection bearing.The fault judging whether to exist axle crash protection bearing according to testing result can also comprise and then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate after magnetic suspension system axis departs from the displacement of center; if the displacement that magnetic suspension system axis departs from center reaches predetermined threshold value; then can think that axle collides protection bearing, exists the fault of axle crash protection bearing.
Step S503, when judging the fault that there is axle crash protection bearing, the motor controlled in magnetic suspension system stops the rotation.In order to avoid damaging magnetic suspension system; when judging the fault that there is axle crash protection bearing; control motor stalls in magnetic suspension system, thus the axle controlled in magnetic levitation bearing system stops operating, and makes the axle no longer crash protection bearing in magnetic levitation bearing system.
Pass through said method; the fault of axle crash protection bearing can be detected in time; and when the fault of axle crash protection bearing being detected, the motor controlled in magnetic suspension system stops the rotation, the damage that the fault avoiding axle crash protection bearing causes magnetic suspension system.
Fig. 6 is the process flow diagram of the shaft detection method in magnetic suspension system according to a second embodiment of the present invention.As shown in Figure 6, the method comprises the steps:
Step S601, departs from the displacement of center at interval of the first schedule time detection axis in X-direction and departs from the displacement of center in the Y direction.Detection module 101 can be displacement transducer, can carry out detection axis depart from the displacement of center in X-direction and depart from the displacement of center in the Y direction by detecting position shifting signal.First schedule time can be the time experimentally calculated, such as 50us, 100us, 1ms etc.The displacement that detection module 101 detection axis departs from center in X-direction can be Err_X=X – Ref_X, and the displacement that axle departs from center in the Y direction can be Err_Y=Y – Ref_Y.Wherein, X is the actual displacement of axle in X-direction, and Y is axle actual displacement in the Y direction, Ref_X is the center of axle in X-direction, Ref_Y is axle center in the Y direction, and Err_X is that axle departs from the displacement of center in X-direction, and Err_Y is the displacement that axle departs from center in the Y direction.
Step S602, the displacement departing from center in X-direction according to axle and the displacement departing from center in the Y direction calculate axle and depart from the displacement of center.After the displacement that detection module 101 detects the displacement that axle departs from center in X-direction and departs from center in the Y direction, the displacement Err_X that computing module 102 can depart from center according to axle in X-direction and the displacement Err_Y departing from center in the Y direction calculates the displacement that axle departs from center
wherein, Err_XY is the displacement that axle departs from center.
Step S603, the displacement departing from center according to axle judges whether to exist the fault of axle crash protection bearing.Axle departs from center in X-direction, then axle may collide protection bearing in the X direction, if axle departs from X-direction the threshold value that center reaches predetermined, then can think that axle collides protection bearing, exists the fault of axle crash protection bearing; Axle departs from center in the Y direction, then axle may collide protection bearing in the Y direction, if axle departs from the threshold value that center reaches predetermined in the Y direction, then can think that axle collides protection bearing, exists the fault of axle crash protection bearing.The fault judging whether to exist axle crash protection bearing according to testing result can also comprise and then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate after magnetic suspension system axis departs from the displacement of center; if the displacement that magnetic suspension system axis departs from center reaches predetermined threshold value; then can think that axle collides protection bearing, exists the fault of axle crash protection bearing.
Step S604, when judging the fault that there is axle crash protection bearing, the motor controlled in magnetic suspension system stops the rotation.In order to avoid damaging magnetic suspension system; when judging unit 20 judges the fault that there is axle crash protection bearing; control motor stalls in magnetic suspension system, thus the axle controlled in magnetic levitation bearing system stops operating, and makes the axle no longer crash protection bearing in magnetic levitation bearing system.
Fig. 7 is the process flow diagram of the shaft detection method in magnetic suspension system according to a third embodiment of the present invention.As shown in Figure 7, the method comprises the steps that S701 is to step S704:
Step S701, detects the displacement that magnetic suspension system axis departs from center.Detect the displacement that magnetic suspension system axis departs from center, X-direction can be detected respectively and depart from the displacement that the displacement of center and Y-direction depart from center, then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate the displacement that magnetic suspension system axis departs from center.
Step S702, judges whether the displacement that axle departs from center is greater than predetermined threshold.After detecting unit 10 detects that axle departs from the displacement of center, departing from displacement Err_XY and the predetermined threshold of center by comparing axle, judging whether the displacement that axle departs from center is greater than predetermined threshold.Predetermined threshold can experimentally draw by Data Summary, preferably, in order to make the value of predetermined threshold more accurate, determines that the method for predetermined threshold comprises the steps that S101 is to step S102:
Step S101, respectively detection axis is in X-direction and the movable maximal value of Y-direction and minimum value.Because the internal diameter of protection bearing is limited; axle in magnetic bearing system is general all at about 100-500um with the gap of protection bearing; therefore predetermined threshold can be in the scope of such as 100-500um, axle X-direction can the maximal value (such as 450um) of action, minimum value (such as 50um) and axle in the Y direction can maximal value (such as 450um), the minimum value (such as 50um) of action.
Step S102, is weighted process to the maximal value detected and minimum value, calculates predetermined threshold.By the maximal value of action, minimum value and axle the maximal value of action, minimum value process can be weighted in the Y direction to the axle detected in X-direction, predetermined threshold can be calculated.This predetermined threshold can be the ultimate value that axle collides protection bearing.
Step S703, when the displacement judging that shaft departs from center is greater than predetermined threshold, determines the fault that there is axle crash protection bearing.When the displacement judging that shaft departs from center is greater than predetermined threshold, determination module 202 determines the fault that there is axle crash protection bearing, also just determines axle and collides protection bearing.
Step S704, when judging the fault that there is axle crash protection bearing, the motor controlled in magnetic suspension system stops the rotation.The content of this step S704 and step S503 embodiment illustrated in fig. 5 is compatible, does not repeat secondary.
Fig. 8 is the process flow diagram of the shaft detection method in magnetic suspension system according to a fourth embodiment of the present invention.Shaft detection method in magnetic suspension system in embodiment shown in Fig. 8 can as the preferred implementation of the shaft detection method in the magnetic suspension system in embodiment illustrated in fig. 7; the fault that there is axle crash protection bearing can be judged whether more accurately; as shown in Figure 8, the method comprises the steps:
Step S801, detects the displacement that magnetic suspension system axis departs from center.Detect the displacement that magnetic suspension system axis departs from center, X-direction can be detected respectively and depart from the displacement that the displacement of center and Y-direction depart from center, then depart from by X-direction displacement that the displacement of center and Y-direction depart from center and calculate the displacement that magnetic suspension system axis departs from center.
At interval of the second Preset Time, step S802, judges whether the displacement that secondary axes depart from center is greater than predetermined threshold.Second Preset Time can be greater than the first Preset Time, and the second Preset Time can comprise multiple first Preset Time.In the second Preset Time, can detect that multiple axle obtained at interval of the first Preset Time departs from the displacement of center in X-direction and departs from the displacement of center in the Y direction.Judge module 201 can judge once to detect in the second Preset Time at interval of the second Preset Time the displacement that the multiple axles obtained depart from center and whether be greater than predetermined threshold.Such as, 100 the first Preset Times are had in the second Preset Time, in each second Preset Time, then there is the displacement that 100 axles depart from center, then to judge in this second Preset Time whether the displacement that 100 axle each axles departed from the displacement of center depart from center is greater than predetermined threshold at interval of the second Preset Time.
Step S803, when the number of times judging that continuously displacement that shaft departs from center is greater than predetermined threshold is greater than preset times, determines the fault that there is axle crash protection bearing.If when the displacement that above-mentioned 100 axles depart from center judges that the number of times that displacement that shaft departs from center is greater than predetermined threshold is more than or equal to preset times continuously, determine the fault that there is axle crash protection bearing.If judge that continuously the number of times that displacement that shaft departs from center is greater than predetermined threshold is less than or equal to preset times, then by judged result clearing before, rejudge the number of times that displacement that axle departs from center is greater than predetermined threshold and whether be greater than preset times.Such as, when the continuous displacement judging that shaft departs from center for 5 times is greater than predetermined threshold, the fault that there is axle crash protection bearing is determined.If judge that the displacement that 4 secondary axes depart from center is greater than predetermined threshold continuously, and the displacement that the 5th axle departs from center is less than predetermined threshold, then again count when judging for the 6th time, the state of first 5 times is reset.Wherein, the value of preset times can be relevant with system architecture, rotating speed, load and experience; be 7 as in the magnetic suspension system of the embodiment of the present invention, the gyro frequency of motor can get preset times when 200Hz; reach reasonable Detection results, when can effectively avoid axle to collide, break protection bearing.
In above-mentioned deterministic process, the corresponding relation figure of time and state when displacement that continuous judgement shaft as shown in Figure 9 departs from center is greater than predetermined threshold can be set up.T1, T2 in figure ... Tn is the first Preset Time, and the state that each first Preset Time is corresponding is 0 or 1.Can represent that the displacement that axle departs from center is greater than predetermined threshold with 1, can represent that the displacement that axle departs from center is less than predetermined threshold with 0.Therefore; Fig. 9 shows and judges that continuously the displacement that shaft departs from center is greater than predetermined threshold; can be used for representing and judge that the number of times that displacement that shaft departs from center is greater than predetermined threshold is greater than preset times continuously, determine the fault that there is axle crash protection bearing.
The corresponding relation of the time shown in Figure 10 and state illustrates displacement that the axle judged departs from center and is greater than the state that displacement that the state of predetermined threshold and axle depart from center is less than predetermined threshold; and judge that continuously the number of times that displacement that shaft departs from center is greater than predetermined threshold is less than or equal to preset times, can not determine the fault that there is axle crash protection bearing.
Step S804, when judging the fault that there is axle crash protection bearing, the motor controlled in magnetic suspension system stops the rotation.Step S804 in this embodiment with embodiment illustrated in fig. 7 in the content of step S704 identical, do not repeat at this.
By judging that number of times that displacement that shaft departs from center is greater than predetermined threshold is greater than preset times to determine the method for the fault that there is axle crash protection bearing continuously; the breakdown judge that sampling error can be avoided to cause is inaccurate, thus improves the precision and accuracy that detect.
Figure 11 is the process flow diagram stopped the rotation according to the motor in the control magnetic suspension system of the embodiment of the present invention.
As shown in the figure, the method by DSP(Digital Signal Processor, referred to as digital signal processor) system realizes the motor controlled in magnetic suspension system and stops the rotation.First, carry out dsp system initialization and the initialization of DSP peripheral module, then write and interrupt entry address, open CPU to interrupt and PIE interrupt register, then etc. to be interrupted and judged whether interruption, if define interruption, enter interruption entrance, and carry out floating axle control algolithm; If determine not interrupt, then continuation etc. are to be interrupted.
Etc. the signal that can be wait motor and stop the rotation to be interrupted; when axle crash protection bearing being detected; send motor halt-transfer signal; and send to interruption to return this motor halt-transfer signal; and by interruption return to send to etc. to be interrupted; perform and wait for interrupt step, and utilize floating axle control algolithm control motor to stop the rotation.When the non-crash protection bearing of axle being detected, sending to interruption to return this detection signal, interrupting returning and to send a signal to etc. to be interrupted, to determine etc. to be interrupted, program continues to judge whether to exist to interrupt.
Digital information processing system can be utilized to control motor by method as shown in figure 11 and step to stop the rotation.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the shaft detection method in magnetic suspension system, is characterized in that, comprising:
Detect the displacement that magnetic suspension system axis departs from center;
The fault that there is axle crash protection bearing is judged whether according to testing result; And
When judging the fault that there is axle crash protection bearing, the motor controlled in described magnetic suspension system stops the rotation.
2. the shaft detection method in magnetic suspension system according to claim 1, is characterized in that, the displacement that detection magnetic suspension system axis departs from center comprises:
Detect described axle at interval of first schedule time to depart from the displacement of center in X-direction and depart from the displacement of center in the Y direction; And
The displacement departing from center in X-direction according to described axle and the displacement departing from center in the Y direction calculate the displacement that described axle departs from center.
3. the shaft detection method in magnetic suspension system according to claim 1, is characterized in that, judges whether that the fault that there is axle crash protection bearing comprises according to testing result:
Judge whether the displacement that described axle departs from center is greater than predetermined threshold; And
When the displacement judging that described axle departs from center is greater than described predetermined threshold, determine the fault that there is axle crash protection bearing.
4. the shaft detection method in magnetic suspension system according to claim 3, is characterized in that, comprising:
Judge whether displacement that described axle departs from center is greater than predetermined threshold and comprises: judge once whether the displacement that described axle departs from center is greater than described predetermined threshold at interval of the second Preset Time,
When the displacement judging that described axle departs from center is greater than described predetermined threshold; determine that the fault that there is axle crash protection bearing comprises: when the number of times judging that displacement that described axle departs from center is greater than described predetermined threshold is continuously greater than preset times, determine the fault that there is axle crash protection bearing.
5. the shaft detection method in magnetic suspension system according to claim 3, is characterized in that, determines described predetermined threshold in the following manner:
Detect described axle respectively in X-direction and the movable maximal value of Y-direction and minimum value; And
Process is weighted to the described maximal value detected and described minimum value, calculates described predetermined threshold.
6. the shaft detection device in magnetic suspension system, is characterized in that, comprising:
Detecting unit, departs from the displacement of center for detecting magnetic suspension system axis;
Judging unit, for judging whether the fault that there is axle crash protection bearing according to testing result; And
Control module, for when judging the fault that there is axle crash protection bearing, the motor controlled in described magnetic suspension system stops the rotation.
7. the shaft detection device in magnetic suspension system according to claim 6, is characterized in that, described detecting unit comprises:
Detection module, departs from the displacement of center in X-direction for detecting described axle at interval of first schedule time and departs from the displacement of center in the Y direction; And
Computing module, calculates for the displacement that departs from center in X-direction according to described axle and the displacement that departs from center in the Y direction the displacement that described axle departs from center.
8. the shaft detection device in magnetic suspension system according to claim 6, is characterized in that, described judging unit comprises:
Judge module, for judging whether the displacement that described axle departs from center is greater than predetermined threshold; And
Determination module, during for being greater than described predetermined threshold in the displacement judging that described axle departs from center, determines the fault that there is axle crash protection bearing.
9. the shaft detection device in magnetic suspension system according to claim 8, is characterized in that, comprising:
Described judge module is used for judging once whether the displacement that described axle departs from center is greater than described predetermined threshold at interval of the second Preset Time,
Described determination module is used for, when the number of times judging that displacement that described axle departs from center is greater than described predetermined threshold is continuously greater than preset times, determining the fault that there is axle crash protection bearing.
10. the shaft detection device in magnetic suspension system according to claim 8, is characterized in that, described judge module is used for determining described predetermined threshold in the following manner:
Detect described axle respectively in X-direction and the movable maximal value of Y-direction and minimum value; And
Process is weighted to the described maximal value detected and described minimum value, calculates described predetermined threshold.
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