CN203362829U - Pre-magnetizing structure of magnetic levitation bearing and control system thereof - Google Patents

Abstract

The utility model discloses a pre-magnetizing structure of a magnetic levitation bearing and a control system thereof. The pre-magnetizing structure comprises a rotor and a stator component, wherein the stator component comprises a magnet pole unit and is provided with an active section and pre-magnetizing sections, the pre-magnetizing sections are arranged at at least one end of the two cambered circumferential end surfaces on the active section of the stator component and have the same magnet pole direction as the active section, so as to together form the magnet pole unit. Due to the adoption of the structure, based on the stator component arranged in an open-loop manner, a rotor based open-loop suspension purpose is realized, and the defect that the rotor suspension weight is indirectly and necessarily increased as a traditional closed-loop circle stator is adopted is avoided.

Description

A kind of magnetic suspension bearing pre-magnetizing structure and control system thereof

Technical field

The utility model belongs to mechanical magnetic suspension field, is specifically related to a kind of magnetic suspension bearing pre-magnetizing structure and control system thereof.

Background technique

Magnetic suspension bearing pre-magnetizing structure and control system thereof (Magnetic Bearing) be utilize magnetic force by rotor suspension in the air, make between rotor and stator not have a kind of apparatus structure of Mechanical Contact.With traditional ball bearing, sliding bearing and filmatic bearing, compare, there is not Mechanical Contact in magnetic bearing, rotor can run to very high rotating speed, have that mechanical wear is little, energy consumption is low, noise is little, the life-span is long, without lubricated, without advantages such as oil pollutions, be specially adapted in high speed, vacuum, the particular surroundings such as ultra-clean.Current magnetic suspension bearing pre-magnetizing structure and control system thereof, so far all still continue to use as shown in Figure 1, be also that the stator inner wall place is along its circumferential uniform many armature structures that are wound with coil, thereby the N that relies on many group surrounding rotors to arrange, the mode of structure that the S utmost point is arranged along rotor radial, realize the electromagnetism absorption suspension effect for rotor, said structure has no doubt possessed the magnetic suspension function based on rotor, but the defect of its existence still can't neglect, mainly be: on the one hand, when rotor one circle, whenever each zone of rotor all will inevitably be repeatedly frequently through as shown in Figure 1 respectively organize N, the S utmost point (in Fig. 1, dotted portion is its magnetic line of force flow path schematic diagram), on it corresponding induction region also will correspondence in addition magnetic pole transform, also constantly discharged and recharged operation, can guarantee that just now each is to N, the S utmost point is for the suction-operated of rotor, yet, rotor must be constantly to rotate when work, each zone of above-mentioned rotor or else cracked ends is crossed and is respectively organized N, the S utmost point and charge and discharge phenomena frequently constantly occurs, and then unavoidably make it produce eddy current loss and cause electric heating effect, finally cause rotor to produce superheating phenomenon, gently affect its normal using effect, heavy produce the mistake cause thermal damage phenomenon of equipment, on the other hand, N, the formation of the S utmost point is all to rely on armature and coil jointly to form, the armature of conventional construction or be whole integrally formed with stator, the whole coiling of coil, once and bearing machining just completes and can't be changed, while as need, running into special occasions such as needing to increase suspending power, can only be undertaken by the mode of changing bearing, change loaded down with trivial details and cost is high, go and be fixed on rotor inner wall more again or after making in advance armature coiling, this mode not only causes each armature top can't form accurate circumferential surface because of various alignment errors etc., the decentraction phenomenon that rotor outer wall and stator inner wall also occur, thereby cause both normally adaptive work at all.In addition, during actual experiment, find, the above-mentioned full circle columnar structure of traditional stator, often cause the upper semi-circle of stator can realize the absorption suspension effect for rotor, and the formed magnetic pole suction of its lower semi-circle has caused increasing the weight of the downward active force of rotor on the contrary, thereby indirectly increased weight rotor weight, thereby caused its device work energy consumption to increase, brought very big puzzlement finally to the practical operation personnel.

In view of this, some enterprise also once considered to adopt the semicircle shape stator to realize that for rotor be the suspension function, but, in the rotary course of rotor, can produce eddy current on the rotor outer wall, because stator has formed open loop shape structure, this eddy current can make rotor enter the close reduction of magnetic of magnetic field one side, and leave the close increase of magnetic of magnetic field one side, in the situation that the magnet coil electric current is constant, eddy current effect can cause the electromagnetic force of both sides electromagnet to change, make the electromagnetic force of rotor approaching side reduce, the electromagnetic force of opposite side increases, when rotor speed is increased to certain value, may cause the unstability of rotor in side direction, finally the normal reliable work of its device brought to very big impact.

Summary of the invention

Primary and foremost purpose of the present utility model is to provide a kind of magnetic suspension bearing pre-magnetizing structure simple in structure, and the serious uneven problem of both sides electromagnet electromagnetic force caused to solve rotor, guarantee its stability under High Rotation Speed, high working efficiency.

For achieving the above object, the utility model has adopted following technological scheme: a kind of magnetic suspension bearing pre-magnetizing structure, comprise rotor and adaptive stator module with it, and form the suspension matching relationship between the two; Described stator module comprises the magnetic pole unit that is used to form rotor suspension power be located thereon, be provided for carrying out the active section of rotor suspension operation and the pre-magnetizing section of carrying out the operation of rotor pre-magnetizing on described stator module, the active section profile is the arc body shape of open loop type, be placed at least one end place of two cambered surface circumferential end faces on the stator module active section of described pre-magnetizing section arranges, and described pre-magnetizing section and active section pole orientation form described magnetic pole unit in the same way and jointly.

Major advantage of the present utility model is: by above structure, dependence is the stator module that open loop is arranged, thereby realize the open loop suspension purpose based on rotor, the defect of the indirect increase rotor suspension weight of also just having avoided traditional circular stator of closed loop to cause; The more important thing is, the utility model is by arranging the pre-magnetizing section, before on each rotor, certain piece zone need to enter the active section of open loop shape stator module and carry out normally suspension work, it all will inevitably be at first through the pre-magnetizing section pre-set this regional pre-magnetizing operation of carrying out rotor, that is to say, by artificial interpolation pre-magnetizing unit, thereby the harmony of stator module both sides electromagnet electromagnetic force during controlled assurance rotor, finally to guarantee its stability under High Rotation Speed; The utility model operates by pre-magnetizing, has also just fundamentally stopped electromagnetic force and even the current unbalance situation that traditional magnetic suspension bearing proper operation mode is brought, and its working efficiency is high.

Another purpose of the present utility model is to provide a kind of control system for magnetic suspension bearing pre-magnetizing structure, and effectively to realize the pre-magnetizing purpose based on magnetic suspension bearing, its working stability is reliable.

For achieving the above object, the utility model has adopted following technological scheme: a kind of for the control system of magnetic suspension bearing pre-magnetizing structure as claimed in claim 1, comprise the sensing unit for detection of its sense of rotation and speed that is arranged in the rotor below, described control system also comprises for receiving sensing unit information and sending the logical operations unit of operation information, described pre-magnetizing section comprises extremely oppositely pre-magnetizing section of forward pre-magnetizing section, all be provided for reducing the coil short switch of its coil turn on coil on each pre-magnetizing section, the operation logic of its logical operations unit is as follows:

The normal operation of stator module active section, sensing unit detection rotor rotating speed is less than or equal to the setup control value, and the coil Circuit breaker that logical operations unit is controlled on each pre-magnetizing section is all closed, in original state;

The normal operation of stator module active section, sensing unit detection rotor rotating speed is higher than the setup control value, and rotor is for being rotated in the forward, logical operations unit is sent signal, controlling coil Circuit breaker on the forward pre-magnetizing section on the pre-magnetizing section disconnects, forward pre-magnetizing section coil turn increases, and realizes the work of forward pre-magnetizing;

The normal operation of stator module active section, sensing unit detection rotor rotating speed is higher than the setup control value, and rotor is counterrotating, logical operations unit is sent signal, controlling coil Circuit breaker on the reverse pre-magnetizing section on the pre-magnetizing section disconnects, forward pre-magnetizing section coil turn increases, and realizes reverse pre-magnetizing work.

Major advantage of the present utility model is: by control system is set, by the rotational speed according to rotor and direction, change magnet spool number in the pre-magnetizing section, thereby realize the control purpose based on aforementioned pre-magnetizing structure; During the value of controlling lower than needs in rotor speed (speed reference of yet setting according to on-the-spot purpose), the now control of the logical operations unit in control system pre-magnetizing section is not worked; When the corresponding value of controlling over needs of rotor speed, logical operations unit executable operations now, and still rotate backward in forward according to the rotor that now sensing unit transmits, come the forward pre-magnetizing section that is positioned at the rotor inlet end or reverse pre-magnetizing section on corresponding control stator module to realize the artificial pre-magnetizing operation before rotor enters stator module, the pre-magnetizing purpose of final effectively realization based on magnetic suspension bearing, its working stability is reliable.

The accompanying drawing explanation

The working principle sectional view that Fig. 1 is traditional magnetic suspension bearing;

The three-dimensional structure diagram that Fig. 2 is stator module;

Fig. 3 is workflow block diagram of the present utility model;

Fig. 4-5 are magnetic pole unit N of the present utility model, S utmost point arranged direction and fundamental diagram thereof.

Embodiment

A kind of magnetic suspension bearing pre-magnetizing structure, comprise rotor and adaptive stator module with it, forms the suspension matching relationship between the two; Described stator module comprises the magnetic pole unit that is used to form rotor suspension power 10 be located thereon, be provided for carrying out the active section a of rotor suspension operation and the pre-magnetizing section b that carries out the operation of rotor pre-magnetizing on described stator module, active section a profile is the arc body shape of open loop type, be placed at least one end place of two cambered surface circumferential end faces on stator module active section a of described pre-magnetizing section b arranges, and described pre-magnetizing section b and active section a pole orientation form described magnetic pole unit 10 in the same way and jointly.

The utility model practical structures as Figure 2-3, like this, by above structure, rely on and be the stator module that open loop is arranged, thereby realize the open loop suspension purpose based on rotor, the defect of the indirect increase rotor suspension weight of also just having avoided traditional circular stator of closed loop to cause; The more important thing is, the utility model is by arranging pre-magnetizing section b, before on each rotor, certain piece zone need to enter the active section a of open loop shape stator module and carry out normally suspension work, it all will inevitably be at first through the pre-magnetizing section b pre-set this regional pre-magnetizing operation of carrying out rotor, that is to say, by artificial interpolation pre-magnetizing unit, thereby by the controllable variations of its interior loop number of turn, thereby the harmony of the stator module both sides electromagnet electromagnetic force while also just having guaranteed rotor, finally to guarantee its stability under High Rotation Speed; The utility model operates by pre-magnetizing, has also just fundamentally stopped electromagnetic force and even the current unbalance situation that traditional magnetic suspension bearing proper operation mode is brought, and its working efficiency is high.

As further preferred version of the present utility model, during practical operation, can be as shown in Figure 2, by described pre-magnetizing section b, be directly that two cambered surface circumferential end faces places on two and the stator module active section a that is placed in arrange.That is to say, the uncertain row turned to due to magnetic suspension bearing itself work, by at the active section two ends, the pre-magnetizing structure all being set, be also forward pre-magnetizing section and reverse pre-magnetizing section, thereby no matter rotor is for being rotated in the forward or counterrotating, all can realize the pre-magnetizing effect for the rotor inlet end on stator module, thereby guarantee its actual working stability utmost point efficiency.

Further, consider height heating and the high loss of current traditional magnetic suspension bearing, the N of described magnetic pole unit 10, S utmost point arranged direction and stator module axial length direction arrange in the same way, thereby by having abandoned the N of magnetic pole unit 10, S extremely all along traditional setting of stator module radial arrangement, the layout arranged in the same way to break through its N of unusual employing, the S utmost point and stator module axial length direction, thus played cleverly the frequent effect unique that transforms magnetic pole while avoiding working rotor, during practical operation, one side is due to the existence of magnetic pole unit 10, rely on its magnetic force, also just realized the effect of the magnetic suspension for rotor that conventional construction can be realized, on the other hand, due to above-mentioned unique N of the present utility model, S utmost point arrangement, no matter how rotor realizes rotating operation under external power, when rotating a circle, on it, all only can there be the change procedure of single polarity in each zone when circumferentially moving, give an example: if the zone foremost of rotor is in the N of magnetic pole unit 10 utmost point magnetization scope, now how circumferentially rotate in this zone, the circumferential direction of having shrouded stator module due to the area of influence of the N utmost point, now this zone of rotor is also just all the time in unipolar magnetized state, also just avoided traditional N, the frequent passive magnetization phenomenon of rotor that the different magnetic pole unit 10 of each polarity on S utmost point setting causes along the stator circumferential arrangement.

During real work, can consider described active section a profile is to semicircle shape, stator module at least comprises the semicircle pressing plate 11 that two plate faces are parallel to each other and is arranged in the electromagnet section 12 between two pressing plate 11 plate faces, and the vertical pressing plate 11 plate faces of N, S utmost point arranged direction of described electromagnet section 12 are arranged, described two pressing plates 11 are postponed and all are furnished with the section of postponing to its two arcs end along its arc direction, and two postpone, and the section middle part sets firmly electromagnet 13 and both form described pre-magnetizing section b, like this, no matter semicircle shape pressing plate 11 is to adopt directly cutting or other global formation mode on the one hand, the inwall that forms after assembling coordinates the stator module formed at its two pressing plate 11 all can guarantee the clearence degree with respect to the rotor outer wall, also can accurately meet the concentricity requirement of stator module inwall and rotor outer wall, thereby avoid making traditional electromagnet and separating of stator and the later stage is installed Concentricity tolerance phenomenon between the stator that may cause and rotor, on the other hand, rotate the number of turns regardless of rotor, now epitrochanterian appointment magnetized area is still also the one pole magnetization, even be also the polarity transformation of---nonpolarity---the N utmost point of the N utmost point, or be the polarity transformation of---nonpolarity---the S utmost point of the S utmost point, as shown in Fig. 4-5, epitrochanterian same magnetized area forever only can change once by magnetic pole when it rotates a circle, eddy current loss amount and heating value when this unique polarity arrangement mode can reduce working rotor greatly, working efficiency can be greatly improved.In addition, because pressing plate 11 can be one-body molded when the actual fabrication, therefore, the semicircle shape body that relies on pressing plate 11 with and the whole affixed electromagnet 13 of the section of postponing and even electromagnet section 12, thereby form the integral structure of stator module, its assembling is very simple and efficient, possesses realizability.

As further preferred version of the present utility model: as shown in Figure 2, stator module is " C " word shape symplex structure; Described electromagnet section 12 all coincide and arranges with electromagnet 13 profiles and structure, and described electromagnet section 12 is four and uniform along its arc direction on pressing plate 11 plate bodys; Described electromagnet 13 is two and the pressing plate 11 plate body two ends that the are placed in section place of postponing; Simultaneously, described every two pressing plates that are fitted to each other 11 are located on electromagnet section 12 and one group of described magnetic pole unit 10 of electromagnet 13 common formations therebetween; Described magnetic pole unit 10 is many groups and axially arranges successively along stator module, 11 faces laminatings of the cooperation of two on each magnetic pole unit 10 pressing plate and the 11 polarity homopolarities settings of this two pressing plate.The structure that closely cooperates between above-mentioned electromagnet section 12 and even electromagnet 13 and pressing plate, in fact also be about to the whole channel passed through for the confession magnetic line of force that formed between the plate body of armature on electromagnet section 12 and electromagnet 13 and pressing plate 11, because rotor is positioned at pressing plate 11 inwall places, and two the closing on pressing plate 11 and arrange for laminating of 10 of each adjacent pole unit, the three groups of magnetic pole units 10 shown in the utility model Fig. 2 of take are example, now each internal face of each pressing plate 11 also forms the N utmost point along its axial direction successively, and---the S utmost point------the S utmost point is constructed by the polarity of the N utmost point---N utmost point---the S utmost point, finally to guarantee its work validity, on the other hand, the passage flow through for convenience of the magnetic line of force due to the formation of the armature on electromagnet section 12 and electromagnet 13 itself, also can regard as for " water channel " of water flow and exist, how many water and great " water channel " can flow through, many thick armature can produce corresponding large active force naturally, but, traditional electrical magnet is often organized single electromagnet unit by list and is just wanted to reach great magnetic-adsorption effect, this is obviously wrong, once actual, use, not only can be because of the meaningless situation that causes stator blocked up that thickens of armature thickness, while is due to the suitability of rotor and stator, the blocked up phenomenon that also just causes the thickness of rotor own, the utility model is by adopting the distributing design, be also that arranged in rows is organized magnetic pole unit 10 more, thereby by stator module is constantly extended and fills the some groups of magnetic pole units 10 that satisfy specified requirement along its axial direction, thereby the mode that increases magnetic pole unit 10 numbers by reducing armature thickness reaches the high magnetic force suction-operated for rotor equally, produce great magnetic force as wanted, can correspondingly fill out and establish how many groups of magnetic pole units 10, easy to use and quick, effect is also very obvious, this can obviously find out the varied in thickness of rotor in Fig. 4 and Fig. 5, and finally rotational stability and the energy consumption for rotor provide very big assurance.In addition, the same structure of electromagnet section and electromagnet structure, not only facilitate actual fabrication, and simultaneously, while after assembling completes and to whole stator module, realizing that system is controlled, its equivalent constructions has also facilitated the controllability of system for the each several part working position.And the arrangement of a plurality of electromagnet section 12 on every group of magnetic pole unit 10, to consider if only arrange an electromagnet section 12 on the magnetic pole unit 10 of direct every group of profile semicircular in shape shape, and the armature direction of this electromagnet section 12 to be also its N, S extreme direction meet and a series of requirements such as the stator module axis arranges in the same way, the coil winding of this electromagnet section 12 also just must be difficult to even say and can't realize so; The utility model is by experiment in many ways, employing is in the mode of a plurality of electromagnetism iron wire bag replace curve by straight lines, in other words, by on a curve theory, by unlimited straight line, forming this theory, a plurality of electromagnet section 12 that is normal coiling by layout forms the stator module of semicircular in shape shape, thereby reduces difficulty of processing; Simultaneously, by the pressing cooperating structure of itself and pressing plate 11, during actual the use, pressing plate can direct extraneous integral body process, and after the coiling of line bag independence, then modularization assembling gets final product separately, and it is simple in structure and very applicable, and market prospects are wide.

As preferred version of the present utility model, it is a kind of for the control system as aforementioned magnetic suspension bearing pre-magnetizing structure that the utility model also provides, comprise the sensing unit for detection of its sense of rotation and speed 20 that is arranged in the rotor below, described control system also comprises for receiving sensing unit 20 information and sending the logical operations unit 30 of operation information, described pre-magnetizing section b comprises forward pre-magnetizing section and reverse pre-magnetizing section, all be provided for reducing the coil short switch of its coil turn on coil on each pre-magnetizing section, the operation logic of its logical operations unit is as follows:

Stator module active section a normal operation, sensing unit 20 detection rotor rotating speeds are less than or equal to the setup control value, and the coil Circuit breaker that logical operations unit 30 is controlled on each pre-magnetizing section b is all closed, in original state;

Stator module active section a normal operation, sensing unit 20 detection rotor rotating speeds are higher than the setup control value, and rotor is for being rotated in the forward, logical operations unit 30 is sent signal, controlling coil Circuit breaker K1 on the forward pre-magnetizing section on pre-magnetizing section b disconnects, forward pre-magnetizing section coil turn increases, and realizes the work of forward pre-magnetizing;

Stator module active section a normal operation, sensing unit 20 detection rotor rotating speeds are higher than the setup control value, and rotor is counterrotating, logical operations unit 30 is sent signal, controlling coil Circuit breaker K2 on the reverse pre-magnetizing section on pre-magnetizing section b disconnects, oppositely pre-magnetizing section coil turn increases, and realizes reverse pre-magnetizing work.

By control system is set, change magnet spool number in pre-magnetizing section b by the rotational speed according to rotor and direction, thereby realize the control purpose based on aforementioned pre-magnetizing structure; During the value of controlling lower than needs in rotor speed (speed reference of yet setting according to on-the-spot purpose), now the 30 control pre-magnetizing section b of the logical operations unit in control system do not work; When the corresponding value of controlling over needs of rotor speed, logical operations unit 30 executable operations now, and still rotate backward in forward according to the rotor that now sensing unit 20 transmits, come the forward pre-magnetizing section that is positioned at the rotor inlet end or reverse pre-magnetizing section on corresponding control stator module to realize the artificial pre-magnetizing operation before rotor enters stator module, the pre-magnetizing purpose of final effectively realization based on magnetic suspension bearing, its working stability is reliable; Each coil short switch in this system all needs logical operations unit to be controlled separately, specifically as shown in Figure 3.

Further, described sensing unit 20 is sensor, and described sensing unit 20 is two and the symmetrical place, rotor below that is arranged in each other.

During the actual use of the utility model, adopt two electromagnet sections 12 that respectively organize the topmost part on magnetic pole unit 10 to realize the stable suspersion of rotor, making a concerted effort for offsetting the gravity of rotor of the vertical direction that these two groups of electromagnet sections 12 produce, and be positioned at the mutual balance of cross component force that two electromagnet sections 12 that its two oblique upside is arranged symmetrically with produce each other, guarantee the lateral stability of rotor, simultaneously, be positioned at 13 of two electromagnet that its two oblique downside is arranged symmetrically with and only with very little power, pin down suspended rotor when original state, and again according to on-the-spot actual rotor rotating speed and turn to, rely on logical operations unit 30 to control and by increasing and reducing its interior loop number of turn and realize the pre-magnetizing effect based on rotor, its overall work is reliable and stable and efficiency is high.

Claims (8)

1. a magnetic suspension bearing pre-magnetizing structure, comprise rotor and adaptive stator module with it, forms the suspension matching relationship between the two, described stator module comprises the magnetic pole unit that is used to form rotor suspension power (10) be located thereon, it is characterized in that: be provided for carrying out the active section (a) of rotor suspension operation and the pre-magnetizing section (b) of carrying out the operation of rotor pre-magnetizing on described stator module, active section (a) profile is the arc body shape of open loop type, be placed at least one end place of two cambered surface circumferential end faces on stator module active section (a) of described pre-magnetizing section (b) arranges, described pre-magnetizing section (b) forms described magnetic pole unit (10) in the same way and jointly with active section (a) pole orientation.

2. magnetic suspension bearing pre-magnetizing structure according to claim 2, it is characterized in that: the N of described magnetic pole unit (10), S utmost point arranged direction and stator module axial length direction arrange in the same way.

3. magnetic suspension bearing pre-magnetizing structure according to claim 3 is characterized in that: described pre-magnetizing section (b) is that two cambered surface circumferential end faces places on two and the stator module active section (a) that is placed in arrange.

4. according to claim 1 or 2 or 3 described magnetic suspension bearing pre-magnetizing structures, it is characterized in that: described active section (a) profile is semicircle shape, stator module at least comprises the semicircle pressing plate (11) that two plate faces are parallel to each other and is arranged in the electromagnet section (12) between two pressing plates (11) plate face, and the N of described electromagnet section (12), the vertical pressing plate of S utmost point arranged direction (11) plate face are arranged; Described two pressing plates (11) are postponed and all are furnished with the section of postponing to its two arcs end along its arc direction, and two postpone, and the section middle part sets firmly electromagnet (13) and both form described pre-magnetizing section (b).

5. magnetic suspension bearing pre-magnetizing structure according to claim 4, it is characterized in that: stator module is " C " word shape symplex structure; Described electromagnet section (12) all coincide and arranges with electromagnet (13) profile and structure, and described electromagnet section (12) is four and uniform along its arc direction on pressing plate (11) plate body; Described electromagnet (13) is two and the pressing plate that is placed in (11) the plate body two ends section place of postponing.

6. magnetic suspension bearing pre-magnetizing structure according to claim 5, it is characterized in that: electromagnet section (12) and electromagnet (13) that described every two pressing plates that are fitted to each other (11) are located on therebetween form one group of described magnetic pole unit (10) jointly; Described magnetic pole unit (10) is many groups and axially arranges successively along stator module, face laminating and the setting of this two pressing plate (11) polarity homopolarity between the cooperation pressing plate of two on each magnetic pole unit (10) (11).

7. one kind for the control system of magnetic suspension bearing pre-magnetizing structure as claimed in claim 1, it is characterized in that: comprise the sensing unit for detection of its sense of rotation and speed (20) that is arranged in the rotor below, described control system also comprises for receiving sensing unit (20) information and sending the logical operations unit (30) of operation information, described pre-magnetizing section (b) comprises extremely oppositely pre-magnetizing section of forward pre-magnetizing section, all be provided for reducing the coil short switch of its coil turn on coil on each pre-magnetizing section, the operation logic of its logical operations unit is as follows:

Stator module active section (a) normal operation, sensing unit (20) detection rotor rotating speed is less than or equal to the setup control value, and the coil Circuit breaker that logical operations unit (30) is controlled on each pre-magnetizing section (b) is all closed, in original state;

Stator module active section (a) normal operation, sensing unit (20) detection rotor rotating speed is higher than the setup control value, and rotor is for being rotated in the forward, logical operations unit (30) is sent signal, controlling coil Circuit breaker on the forward pre-magnetizing section on pre-magnetizing section (b) disconnects, forward pre-magnetizing section coil turn increases, and realizes the work of forward pre-magnetizing;

Stator module active section (a) normal operation, sensing unit (20) detection rotor rotating speed is higher than the setup control value, and rotor is counterrotating, logical operations unit (30) is sent signal, controlling coil Circuit breaker on the reverse pre-magnetizing section on pre-magnetizing section (b) disconnects, forward pre-magnetizing section coil turn increases, and realizes reverse pre-magnetizing work.

8. the control system of magnetic suspension bearing pre-magnetizing structure according to claim 7, it is characterized in that: described sensing unit (20) is sensor, described sensing unit (20) is two and the symmetrical place, rotor below that is arranged in each other.

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