CN105202023A - Magnetic suspension bearing system and its control method and device - Google Patents

Abstract

The invention discloses a magnetic suspension bearing system and its control method and device. Among them, the control method of the magnetic suspension bearing system includes: detecting the initial position of the shaft in the magnetic suspension bearing system, and detecting the center position of the protection bearing in the magnetic suspension bearing system; obtaining the preset amplitude and preset times; The amplitude and preset times are used to calculate the intermediate levitation position during the floating process of the shaft; and the current flowing through the bearing coil in the magnetic levitation bearing system is controlled by using the intermediate levitation position as a control target. The present invention solves the problem that the protective bearing of the magnetic suspension bearing system is easily damaged in the prior art, and further achieves the effects of improving the reliability of the magnetic suspension bearing system, preventing the system from being damaged, and reducing maintenance costs.

Description

Magnetic suspension bearing system and its control method and device

technical field

The invention relates to the field of magnetic suspension, in particular to a magnetic suspension bearing system and a control method and device thereof.

Background technique

For the pure electromagnetic magnetic suspension bearing system, before the system is powered on, the shaft stops at the bottom of the protective bearing. If the direct floating shaft is used, the shaft will quickly move from the bottom of the protective bearing to the center position, and the floating shaft will instantly move to the center position. There will be a relatively large current, and in serious cases, there may be a problem with the shaft collision protection bearing. It is easier to shatter the protection bearing, resulting in damage to the protection bearing, which has a greater impact on system reliability.

Aiming at the problem that the protective bearing of the magnetic suspension bearing system is easily damaged in the related art, no effective solution has been proposed so far.

Contents of the invention

The main purpose of the present invention is to provide a magnetic suspension bearing system and its control method and device, so as to solve the problem that the protective bearing of the magnetic suspension bearing system is easily damaged in the prior art.

According to one aspect of the present invention, a method for controlling a magnetic suspension bearing system is provided.

The control method of the magnetic suspension bearing system according to the present invention includes: detecting the initial position of the shaft in the magnetic suspension bearing system, and detecting the center position of the protection bearing in the magnetic suspension bearing system; obtaining a preset amplitude and a preset number of times, wherein the The preset range represents the range of switching the floating position every time the shaft moves from the initial position to the center position, and the preset number of times represents the process of the shaft moving from the initial position to the center position the total number of times to switch the floating position; calculate the intermediate floating position in the floating process of the shaft according to the initial position, the central position, the preset amplitude and the preset number of times; and use the intermediate floating position The current flowing through the bearing coil in the magnetic suspension bearing system is controlled as a control target.

Further, calculating the intermediate floating position during the floating process of the shaft according to the initial position, the central position, the preset amplitude and the preset number of times includes: according to the initial position, the central position and calculating a target parameter for switching the floating position by the preset number of times; and calculating the intermediate floating position according to the initial position, the preset range and the target parameter.

Further, the target parameter is calculated according to the formula P=(CB)/A, wherein P is the target parameter, C is the center position, B is the initial position, and A is the preset number of times; according to The formula C _x =P*S+B calculates the intermediate floating position, wherein C _x is the intermediate floating position, and S is the preset amplitude.

Further, the initial position B includes a plurality of initial positions B _i of the shaft in the radial direction, i takes from 1 to n in sequence, and n is a natural number greater than 2, wherein, it is calculated according to the formula P=(CB)/A The target parameter includes: calculating the target parameter P _i corresponding to the shaft in the radial direction according to the formula P _i =(CB _i )/A; calculating the intermediate suspension position according to the formula C _x =P*S+B includes: According to the formula _Cxi = _Pi *S+ _Bi, calculate the intermediate suspension position _Cxi corresponding to the shaft in the radial direction; use the intermediate suspension position as the control target to control the current flowing through the bearing coil in the magnetic suspension bearing system The method includes: controlling the current flowing through the bearing coil with a plurality of the intermediate suspension positions as the control targets.

Further, after controlling the current flowing through the bearing coil in the magnetic suspension bearing system with the intermediate suspension position as the control target, the control method further includes: obtaining the floating time of the shaft; detecting the actual Suspended position: judging whether the floating time reaches a preset time, and judging whether the actual floating position coincides with the center position, wherein the preset time means that the shaft moves from the initial position to the time at the center position; and when it is judged that the buoyancy time has reached the preset time, and the actual levitation position and the center position do not coincide, increase the preset range and recalculate the The current of the bearing coil is controlled until the actual levitation position coincides with the center position.

According to one aspect of the present invention, a control device for a magnetic suspension bearing system is provided.

The control device of the magnetic suspension bearing system according to the present invention includes: a first detection unit for detecting the initial position of the shaft in the magnetic suspension bearing system, and detecting the center position of the protection bearing in the magnetic suspension bearing system; a first acquisition unit, Used to obtain a preset range and a preset number of times, wherein the preset range represents the range of switching the floating position each time during the movement of the shaft from the initial position to the center position, and the preset number of times represents the The total number of times the suspension position is switched during the movement of the shaft from the initial position to the central position; a calculation unit for calculating according to the initial position, the central position, the preset amplitude and the preset number of times an intermediate levitation position during the levitation process of the shaft; and a control unit, configured to use the intermediate levitation position as a control target to control the current flowing through the bearing coil in the magnetic suspension bearing system.

Further, the calculation unit includes: a first calculation module, used to calculate the target parameter for switching the floating position according to the initial position, the central position and the preset times; and a second calculation module, used to calculate according to the The intermediate floating position is calculated based on the initial position, the preset range and the target parameter.

Further, the first calculation module is used to calculate the target parameter according to the formula P=(CB)/A, where P is the target parameter, C is the center position, B is the initial position, and A is the preset number of times; the second calculation module is used to calculate the intermediate floating position according to the formula C _x =P*S+B, wherein, C _x is the intermediate floating position, and S is the preset amplitude .

Further, the initial position B includes a plurality of initial positions B _i of the shaft in the radial direction, i takes from 1 to n in sequence, and n is a natural number greater than 2, wherein the first calculation module is used to follow the formula P _i =( _{CB i} )/A calculates the target parameter _{P i} corresponding to the axis in the radial direction; the second calculation module is used _to calculate the corresponding axis in the An intermediate floating position C _xi in the radial direction; the control unit includes: a control module configured to control the current flowing through the bearing coil with a plurality of the intermediate floating positions as the control targets.

Further, the control device further includes: a second acquisition unit, used to acquire the floating time of the shaft; a second detection unit, used to detect the actual floating position of the shaft; a judging unit, used to judge the Whether the floating time reaches a preset time, and judging whether the actual floating position coincides with the central position, wherein the preset time represents the time for the shaft to move from the initial position to the central position; and an increasing unit, configured to increase the preset range when the judging unit judges that the buoyancy time has reached the preset time, and the actual levitation position does not coincide with the central position, And recalculate the current of the bearing coil until the actual levitation position coincides with the center position.

According to another aspect of the present invention, a magnetic suspension bearing system is provided, and the magnetic suspension bearing system includes any control device for the magnetic suspension bearing system provided in the foregoing content of the present invention.

In the present invention, the initial position of the shaft in the magnetic suspension bearing system is detected, and the center position of the protective bearing in the magnetic suspension bearing system is detected; the preset range and the preset number of times are obtained, wherein the preset range represents the The magnitude of switching the suspension position each time during the movement of the shaft from the initial position to the center position, and the preset number of times represents the total number of switching suspension positions during the movement of the shaft from the initial position to the center position number of times; calculate the intermediate suspension position during the floating process of the shaft according to the initial position, the central position, the preset amplitude and the preset number of times; and use the intermediate suspension position as the control target to control the flow through The current of the bearing coil in the magnetic suspension bearing system. By controlling the current flowing through the bearing coil according to the initial position, the center position, the floating range during the floating process and the number of times of switching the floating position, the slow floating of the shaft is controlled in a periodic floating way, which is relatively different from the existing In terms of the direct floating shaft in the technology, the periodic slow floating method can slow down the movement speed of the shaft, thereby avoiding the damage of the protective bearing caused by the rapid movement of the shaft and colliding with the protective bearing, which solves the problem of the magnetic suspension bearing system in the prior art. The problem of easy damage of the protection bearing is achieved, and then the reliability of the magnetic suspension bearing system is improved, the system is prevented from being damaged, and the effect of reducing maintenance costs is achieved.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a flowchart of a control method of a magnetic suspension bearing system according to an embodiment of the present invention; and

Fig. 2 is a schematic diagram of a control device of a magnetic suspension bearing system according to an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1

According to the embodiment of the present invention, a method embodiment that can be used to implement the embodiment of the device of the present application can be provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a program such as a set of computer-executable instructions computer system, and although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

According to an embodiment of the present invention, a control method of a magnetic suspension bearing system is provided. The following describes the control method of the magnetic suspension bearing system provided by the embodiment of the present invention in detail:

Fig. 1 is a flowchart of a control method for a magnetic suspension bearing system according to an embodiment of the present invention. As shown in Fig. 1, the method includes the following steps S102 to S108:

S102: Detect the initial position of the shaft in the magnetic suspension bearing system, and detect the center position of the protective bearing in the magnetic suspension bearing system, wherein the initial position of the shaft refers to the position of the lowest end of the contact part between the shaft and the protective bearing in the radial direction, Both the detection of the initial position and the center position can be carried out when the magnetic suspension bearing is just powered on.

S104: Obtain the preset range and preset times, wherein the preset range indicates the range of switching the suspension position each time during the movement of the axis from the initial position to the center position, and the preset number of times indicates the switching of the axis during the movement from the initial position to the center position The total number of hover positions.

S106: Calculate the intermediate floating position during the floating process of the shaft according to the initial position, the central position, the preset amplitude and the preset times.

S108: Use the intermediate suspension position as the control target to control the current flowing through the bearing coil in the magnetic suspension bearing system, wherein any method in the prior art can be used to calculate the magnitude of the current of the bearing coil corresponding to the intermediate suspension position, and control the current flowing through the bearing coil The current of the bearing coil is used to control the output of the bearing.

The control method of the magnetic suspension bearing system provided by the embodiment of the present invention controls the current flowing through the bearing coil according to the initial position, the center position, the floating amplitude during the floating process and the number of times of switching the floating position, so as to realize the cycle-by-cycle The slow floating of the shaft is controlled by the periodic floating method. Compared with the direct floating shaft method in the prior art, the periodic slow floating method can slow down the movement speed of the shaft, thereby avoiding the rapid movement of the shaft and the collision protection bearing. The damage of the protective bearing solves the problem that the protective bearing of the magnetic suspension bearing system is easily damaged in the prior art, and then achieves the effect of improving the reliability of the magnetic suspension bearing system, avoiding system damage, and reducing maintenance costs.

Among them, in the embodiment of the present invention, the method of calculating the intermediate floating position during the floating process of the shaft according to the initial position, the center position, the preset amplitude and the preset number of times can adopt the following methods:

First, calculate the target parameter for switching the floating position according to the initial position, the central position and the preset number of times. Specifically, the target parameter can be calculated according to the formula P=(C-B)/A, where P is the target parameter, C is the center position, and B is the initial position, and A is the preset number of times.

Secondly, calculate the intermediate floating position according to the initial position, the preset amplitude and the target parameters. Specifically, the intermediate floating position can be calculated according to the formula C _x = P*S+B, where C _x is the intermediate floating position, and S is the preset amplitude .

Preferably, in the control method of the magnetic suspension bearing system provided in the embodiment of the present invention, the detected initial position B includes a plurality of initial positions Bi of the shaft in the radial direction, i takes 1 to n in sequence, and n is 2 or more A natural number, generally speaking, n is 4, respectively representing the initial position of the shaft in the four directions of up, down, left and right in the radial direction.

Correspondingly, when calculating the target parameter and the center suspension position, the target parameter P _i of the corresponding axis in the radial direction is calculated according to the formula P _i =(CB _i )/A, and the formula C _xi =P _i *S +B _i calculates the mid-floating position C _xi of the corresponding axis in the radial direction, where, for the case where n is set to 4, it is to calculate the target parameters of the corresponding axis in the four radial directions of up, down, left and right, and correspondingly Calculate the mid-floating position of the corresponding axis in the four radial directions of up, down, left, and right. Taking the intermediate suspension position as the control target to control the current flowing through the bearing coil in the magnetic suspension bearing system is specifically: taking multiple intermediate suspension positions as the control target to control the current flowing through the bearing coil, that is, considering the intermediate suspension positions in all directions , and take the integrated intermediate suspension position as the control target to control the current flowing through the bearing coil.

The control method of the magnetic suspension bearing system provided by the preferred embodiment of the present invention realizes the precise control of the shaft start-up by detecting multiple initial positions of the shaft in the radial direction, and then controlling the current flowing through the bearing coil based on the multiple initial positions. Floating, on the basis of improving the reliability of the magnetic suspension bearing system, avoiding shaft collision and protecting the bearing, it also achieves the effect of improving the accuracy of floating.

Further, after controlling the current flowing through the bearing coil in the magnetic suspension bearing system with the intermediate suspension position as the control target, the control method of the magnetic suspension bearing system provided in the embodiment of the present invention further includes: obtaining the floating time of the shaft, wherein, the starting time Float time can be the time accumulated from the time when the bearing system is powered on until the time reaches the current moment; detect the actual floating position of the shaft, that is, the actual floating position of the shaft at the current moment; judge whether the floating time reaches the preset Time, and judge whether the actual floating position coincides with the center position, where the preset time indicates the time for the axis to move from the initial position to the center position; when it is judged that the floating time reaches the preset time, and the actual floating position and the center position do not coincide In the case of , increase the preset range and recalculate the current of the bearing coil until the actual levitation position coincides with the center position, that is, after judging that the float time of the shaft has accumulated to the preset time, but the levitation position has not In the case that the center position of the suspension is finally required, the preset amplitude bar is set to be large, and the current flowing through the bearing coil is recalculated to control the suspension position to reach the center position. Wherein, when the floating time reaches the preset time, the accumulated floating time needs to be cleared and the timing should be restarted.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is Better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

Example 2

According to an embodiment of the present invention, there is also provided a control device for a magnetic suspension bearing system for implementing the above-mentioned control method for a magnetic suspension bearing system. The control device is mainly used to implement the control method provided in the above content of the embodiment of the present invention. The following describes the present invention The control device of the magnetic suspension bearing system provided by the embodiment of the invention is introduced in detail:

Fig. 2 is a schematic diagram of a control device for a magnetic suspension bearing system according to an embodiment of the present invention. As shown in Fig. 2 , the control device for a magnetic suspension bearing system provided by an embodiment of the present invention mainly includes a first detection unit 10 and a first acquisition unit 20 , computing unit 30 and control unit 40, wherein:

The first detection unit 10 is used to detect the initial position of the shaft in the magnetic suspension bearing system, and detect the center position of the protective bearing in the magnetic suspension bearing system, wherein the initial position of the shaft refers to the contact part of the shaft and the protective bearing in the radial direction The detection of the bottom position, the initial position and the center position can all be detected when the magnetic suspension bearing is just powered on.

The first acquiring unit 20 is used to acquire a preset range and a preset number of times, wherein the preset range represents the range of switching the floating position each time during the movement of the shaft from the initial position to the center position, and the preset number of times represents the movement of the shaft from the initial position to the center position. Total number of hover position toggles during center position.

The calculation unit 30 is used to calculate the intermediate floating position during the shaft lifting process according to the initial position, the central position, the preset amplitude and the preset times.

The control unit 40 is used to control the current flowing through the bearing coil in the magnetic suspension bearing system with the intermediate suspension position as the control target, wherein any one of the prior art can be used to calculate the magnitude of the current of the bearing coil corresponding to the intermediate suspension position, through Control the current flowing through the bearing coil to control the output of the bearing.

The control device of the magnetic suspension bearing system provided by the embodiment of the present invention controls the current flowing through the bearing coil according to the initial position, the center position, the floating amplitude during the floating process and the number of times of switching the floating position, so as to realize the cycle-by-cycle The slow floating of the shaft is controlled by the periodic floating method. Compared with the direct floating shaft method in the prior art, the periodic slow floating method can slow down the movement speed of the shaft, thereby avoiding the rapid movement of the shaft and the collision protection bearing. The damage of the protective bearing solves the problem that the protective bearing of the magnetic suspension bearing system is easily damaged in the prior art, and then achieves the effect of improving the reliability of the magnetic suspension bearing system, avoiding system damage, and reducing maintenance costs.

Wherein, the calculation unit 30 mainly includes a first calculation module and a second calculation module, the first calculation module is mainly used to calculate the target parameter for switching the floating position according to the initial position, the center position and the preset number of times, specifically, according to the formula P= (CB)/A calculates the target parameters, where P is the target parameter, C is the center position, B is the initial position, and A is the preset number of times. The second calculation module is mainly used to calculate the intermediate suspension position according to the initial position, the preset range and the target parameters. Specifically, the intermediate suspension position can be calculated according to the formula C _x = P*S+B, wherein C _x is the intermediate suspension position, S is the preset range.

Preferably, in the control device of the magnetic suspension bearing system provided by the embodiment of the present invention, the detected initial position B includes a plurality of initial positions B _i of the shaft in the radial direction, where i takes 1 to n in sequence, and n is 2 or more The natural number of , generally speaking, n is 4, which respectively represent the initial positions of the shaft in the four directions of up, down, left and right in the radial direction.

Correspondingly, the first calculation module calculates the target parameter P i of the corresponding axis in the radial direction according to the formula Pi=(CB _i )/A, and the second calculation module calculates the target parameter P _i of the corresponding axis according to the formula C _xi =P _i *S+B _i The intermediate suspension position C _xi in the radial direction, where, for the case where n is 4, it is to calculate the target parameters of the four radial directions of the corresponding axis in the up, down, left and right, and correspondingly calculate the corresponding axis in the up, down, The middle floating position in the four radial directions of down, left and right. The control unit 40 includes a control module, which is used to control the current flowing through the bearing coil with a plurality of intermediate suspension positions as control targets, that is, to comprehensively consider the intermediate suspension positions in all directions, and use the comprehensive intermediate suspension positions as the control target. The control target is used to control the current flowing through the bearing coils.

The control device for the magnetic suspension bearing system provided by the preferred embodiment of the present invention realizes the precise control of the shaft start-up by detecting multiple initial positions of the shaft in the radial direction, and then controlling the current flowing through the bearing coil based on the multiple initial positions. Floating, on the basis of improving the reliability of the magnetic suspension bearing system, avoiding shaft collision and protecting the bearing, it also achieves the effect of improving the accuracy of floating.

Further, the control device also includes a second acquisition unit, a second detection unit, a judging unit, and an increase unit, wherein the second acquisition unit is used to acquire the floating time of the shaft, and the floating time can be measured after the bearing system is powered on. Start timing until the time accumulated at the current moment; the second detection unit is used to detect the actual floating position of the shaft, that is, the actual floating position of the shaft at the current moment; the judging unit is used to judge whether the floating time reaches the preset time time, and judge whether the actual floating position coincides with the center position, wherein the preset time represents the time for the axis to move from the initial position to the center position; When the floating position and the central position do not coincide, increase the preset range and recalculate the current of the bearing coil until the actual floating position coincides with the central position, that is, when it is judged that the floating time of the shaft has accumulated to the preset time , but the levitation position has not yet reached the center position that needs to be levitated, the preset amplitude bar is set to be large, and the current flowing through the bearing coil is recalculated to control the levitation position to reach the center position. Wherein, when the floating time reaches the preset time, the accumulated floating time needs to be cleared and the timing should be restarted.

In addition, the embodiment of the present invention also provides a magnetic suspension bearing system, the magnetic suspension bearing system can be any system that applies the control method of the magnetic suspension bearing system provided by the above content of the embodiment of the present invention, and can also include the implementation of the present invention An example of any control device for the magnetic suspension bearing system provided in the above content.

From the above description, it can be seen that the present invention realizes the periodic floating method to control the slow floating of the shaft. Compared with the method of directly floating the shaft in the prior art, the periodic slow floating method can reduce the Slow the movement speed of the shaft, thereby avoiding the damage of the protection bearing caused by the fast movement of the shaft and colliding with the protection bearing, so as to improve the reliability of the magnetic suspension bearing system, avoid the system from being damaged, and reduce the maintenance cost.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. a controlling method for magnetic levitation bearing system, is characterized in that, comprising:

Detect the initial position of described magnetic levitation bearing system axis, and detect the central position protecting bearing in described magnetic levitation bearing system;

Obtain predetermined amplitude and preset times, wherein, described predetermined amplitude represents that described axle moves to from described initial position the amplitude switching levitation position the process of described central position each time, and described preset times represents that described axle moves to from described initial position the total degree switching levitation position the process of described central position;

The middle levitation position in described axle floating process is calculated according to described initial position, described central position, described predetermined amplitude and described preset times; And

Using described middle levitation position as control objectives control flow check through the electric current of described magnetic levitation bearing system middle (center) bearing coil.

2. controlling method according to claim 1, is characterized in that, comprises according to the middle levitation position that described initial position, described central position, described predetermined amplitude and described preset times calculate in described axle floating process:

The target component switching levitation position is calculated according to described initial position, described central position and described preset times; And

Described middle levitation position is calculated according to described initial position, described predetermined amplitude and described target component.

3. controlling method according to claim 2, is characterized in that:

Calculate described target component according to formula P=(C-B)/A, wherein, P is described target component, and C is described central position, and B is described initial position, and A is described preset times;

According to formula C _x=P*S+B calculates described middle levitation position, wherein, and C _xfor described middle levitation position, S is described predetermined amplitude.

4. controlling method according to claim 3, is characterized in that, described initial position B comprises the multiple initial position Bs of described axle in radial direction _i, i gets 1 to n successively, and n is the natural number of more than 2, wherein,

Calculate described target component according to formula P=(C-B)/A to comprise: according to formula P _i=(C-B _i)/A calculates the target component P of corresponding described axle in radial direction _i;

According to formula C _x=P*S+B calculates described middle levitation position and comprises: according to formula C _xi=P _i* S+B _icalculate the middle levitation position C of corresponding described axle in radial direction _xi;

Comprise using described middle levitation position as control objectives control flow check through the electric current of described magnetic levitation bearing system middle (center) bearing coil: the electric current using multiple described middle levitation position as described control objectives control flow check through described bearing coil.

5. controlling method according to claim 1, is characterized in that, using described middle levitation position as control objectives control flow check after the electric current of described magnetic levitation bearing system middle (center) bearing coil, described controlling method also comprises:

Obtain the floating time of described axle;

Detect the actual levitation position of described axle;

Judge whether the described floating time reaches Preset Time, and judge whether described actual levitation position overlaps with described central position, wherein, described Preset Time represents that described axle moves to the time of described central position from described initial position; And

Judging that the described floating time reaches described Preset Time, and when described actual levitation position and described central position do not overlap, increase described predetermined amplitude, and recalculate the electric current of described bearing coil, until described actual levitation position overlaps with described central position.

6. a control gear for magnetic levitation bearing system, is characterized in that, comprising:

First detection unit, for detecting the initial position of described magnetic levitation bearing system axis, and detects the central position protecting bearing in described magnetic levitation bearing system;

First acquiring unit, for obtaining predetermined amplitude and preset times, wherein, described predetermined amplitude represents that described axle moves to from described initial position the amplitude switching levitation position the process of described central position each time, and described preset times represents that described axle moves to from described initial position the total degree switching levitation position the process of described central position;

Computing unit, for calculating the middle levitation position in described axle floating process according to described initial position, described central position, described predetermined amplitude and described preset times; And

Control unit, for using described middle levitation position as control objectives control flow check through the electric current of described magnetic levitation bearing system middle (center) bearing coil.

7. control gear according to claim 6, is characterized in that, described computing unit comprises:

First computing module, for calculating the target component switching levitation position according to described initial position, described central position and described preset times; And

Second computing module, for calculating described middle levitation position according to described initial position, described predetermined amplitude and described target component.

8. control gear according to claim 7, is characterized in that:

Described first computing module is used for calculating described target component according to formula P=(C-B)/A, and wherein, P is described target component, and C is described central position, and B is described initial position, and A is described preset times;

Described second computing module is used for according to formula C _x=P*S+B calculates described middle levitation position, wherein, and C _xfor described middle levitation position, S is described predetermined amplitude.

9. control gear according to claim 8, is characterized in that, described initial position B comprises the multiple initial position Bs of described axle in radial direction _i, i gets 1 to n successively, and n is the natural number of more than 2, wherein,

Described first computing module is used for according to formula P _i=(C-B _i)/A calculates the target component P of corresponding described axle in radial direction _i;

Described second computing module is used for according to formula C _xi=P _i* S+B _icalculate the middle levitation position C of corresponding described axle in radial direction _xi;

Described control unit comprises: control module, for the electric current using multiple described middle levitation position as described control objectives control flow check through described bearing coil.

10. control gear according to claim 6, is characterized in that, described control gear also comprises:

Second acquisition unit, for obtaining the floating time of described axle;

Second detection unit, for detecting the actual levitation position of described axle;

Judging unit, for judging whether the described floating time reaches Preset Time, and judge whether described actual levitation position overlaps with described central position, wherein, described Preset Time represents that described axle moves to the time of described central position from described initial position; And

Increase unit, for judging that at described judging unit the described floating time reaches described Preset Time, and when described actual levitation position and described central position do not overlap, increase described predetermined amplitude, and recalculate the electric current of described bearing coil, until described actual levitation position overlaps with described central position.

11. 1 kinds of magnetic levitation bearing systems, is characterized in that, comprise the control gear of the magnetic levitation bearing system according to any one of claim 6 to 10.