CN112443575B - Control system of magnetic suspension bearing and magnetic suspension system - Google Patents
Control system of magnetic suspension bearing and magnetic suspension system Download PDFInfo
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- CN112443575B CN112443575B CN201910798359.0A CN201910798359A CN112443575B CN 112443575 B CN112443575 B CN 112443575B CN 201910798359 A CN201910798359 A CN 201910798359A CN 112443575 B CN112443575 B CN 112443575B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0444—Details of devices to control the actuation of the electromagnets
- F16C32/0457—Details of the power supply to the electromagnets
Abstract
A control system for a magnetic bearing, comprising: the first end of the middle winding bridge arm is used for being connected with the anode of an external direct-current power supply, the second end of the middle winding bridge arm is used for being connected with the cathode of the external direct-current power supply, and the third end of the middle winding bridge arm is used for being connected with the first end of each winding coil of the magnetic suspension bearing; the magnetic suspension bearing comprises a first bridge arm module and a second bridge arm module which are identical in structure, wherein the first bridge arm module comprises a plurality of winding bridge arms corresponding to the degree of freedom of the magnetic suspension bearing, a first end and a second end of each winding bridge arm are respectively connected with a positive pole and a negative pole of an external direct-current power supply, and a third end is connected with a second end of a corresponding winding coil. Compared with the existing magnetic suspension bearing control system, the system can switch the working states of the first bridge arm module and the second bridge arm module when the control system is abnormal (such as a switching tube fault), so that the whole control system can still keep normal work, fault-tolerant control is realized, and the reliability of the whole system is improved.
Description
Technical Field
The invention relates to the technical field of electromagnetic bearings, in particular to a control system of a magnetic suspension bearing and a magnetic suspension system.
Background
Electromagnetic bearing technology, i.e. technology for rotating a mechanical rotor in a levitated manner by electromagnetic force. The technology is favored by the industry due to the excellent characteristics of no contact, no lubrication and no abrasion, and is gradually applied to the fields of medical equipment, turbomachinery and the like.
In the control system of the electromagnetic bearing, a power amplifier is an important ring, and the power amplifier converts a control signal into a current output so as to drive the electromagnetic bearing to suspend. The power amplifier of the electromagnetic bearing mostly adopts a power electronic conversion device, and for a 5-degree-of-freedom electromagnetic bearing, the number of switch tubes consumed by the traditional topological structure is large, and the total loss of the system is huge.
Disclosure of Invention
To solve the above problems, the present invention provides a control system of a magnetic suspension bearing, the system comprising:
the first end of the middle winding bridge arm is used for being connected with the anode of an external direct-current power supply, the second end of the middle winding bridge arm is used for being connected with the cathode of the external direct-current power supply, and the third end of the middle winding bridge arm is used for being connected with the first end of each winding coil of the magnetic suspension bearing;
the magnetic suspension bearing comprises a first bridge arm module and a second bridge arm module which are identical in structure, wherein the first bridge arm module comprises a plurality of winding bridge arms corresponding to the degree of freedom of a magnetic suspension bearing, a first end and a second end of each winding bridge arm are respectively connected with the anode and the cathode of the external direct-current power supply, and a third end is connected with the second end of the corresponding winding coil.
According to one embodiment of the invention, the middle winding bridge arm comprises a third switching tube with anti-phase parallel diodes and a fourth switching tube with anti-phase parallel diodes, wherein the first end and the second end of the third switching tube are respectively connected with the anode of the external direct current power supply and the first end of the fourth switching tube, and the second end of the fourth switching tube is connected with the cathode of the external direct current power supply.
According to an embodiment of the present invention, each winding bridge arm in the first bridge arm modules has the same structure, and the winding bridge arm includes a first switching tube having an anti-phase parallel diode and a second switching tube having an anti-phase parallel diode, wherein a first end of the first switching tube forms a first end of the winding bridge arm to be connected to the positive electrode of the external dc power supply, a second end of the first switching tube is connected to a first end of the second switching tube and forms a third end of the winding bridge arm to be connected to a second end of the corresponding winding coil, and a second end of the second switching tube forms a second end of the winding bridge arm to be connected to the negative electrode of the external dc power supply.
According to one embodiment of the invention, the system further comprises:
and the control module is connected with the first bridge arm module and the second bridge arm module and is used for controlling the working state of each switching tube in the first bridge arm module and the second bridge arm module.
According to an embodiment of the present invention, under a normal condition, the control module is configured to control each first switching tube in the first bridge arm module and each second switching tube in the second bridge arm module to be in an operating state, and control each second switching tube in the first bridge arm module and each first switching tube in the second bridge arm module to be in a non-operating state.
According to an embodiment of the present invention, when a fault exists in a first switching tube in the first bridge arm module or a second switching tube in the second bridge arm module, the control module is configured to control each first switching tube in the first bridge arm module and each second switching tube in the second bridge arm module to be in a non-operating state, and control each second switching tube in the first bridge arm module and each first switching tube in the second bridge arm module to be in an operating state.
According to an embodiment of the present invention, the control module is further connected to the middle winding bridge arm and configured to control a working state of a switching tube in the middle winding bridge arm, wherein the control module is configured to control the working state of the switching tube in the middle winding bridge arm by using a preset fixed duty ratio.
According to one embodiment of the invention, the control module is configured to control the operating state of each switching tube in the first bridge arm module and the second bridge arm module in a variable duty ratio manner.
According to one embodiment of the invention, for said first leg module, when there is no anomaly in the control system, the control cycle comprises a forward conduction period,
and in the forward conduction period, the control module is configured to control each upper bridge arm in the first bridge arm module to be in a conduction state and control a lower bridge arm of the middle winding bridge arm to be in a conduction state.
According to one embodiment of the invention, for the first leg module, when there is no anomaly in the control system, the control cycle further comprises a negative-going conduction period,
and in the negative conduction period, the control module is configured to control each upper bridge arm in the first bridge arm module and the lower bridge arm of the middle winding bridge arm to be in a disconnected state.
According to one embodiment of the invention, for said first leg module, when there is no anomaly in the control system, said control cycle further comprises a negative freewheel period during which,
the control module is configured to control each upper bridge arm in the first bridge arm module to be in a conducting state, control a lower bridge arm of the middle winding bridge arm to be in a disconnecting state, and enable the upper bridge arm of the middle winding bridge arm to carry out follow current; or the like, or, alternatively,
the control module is configured to control each upper bridge arm in the first bridge arm module to be in a disconnected state, and each lower bridge arm in the first bridge arm module performs follow current to control the lower bridge arm of the middle winding bridge arm to be in a connected state.
The invention also provides a magnetic levitation system, characterized in that the system comprises: a magnetic suspension bearing; and a control system as claimed in any one of the above.
Compared with the existing magnetic suspension bearing control system, the control system of the magnetic suspension bearing provided by the invention can switch the working states of the first bridge arm module and the second bridge arm module when the control system is abnormal (such as a switching tube fault), so that the whole control system can still keep normal working, fault-tolerant control is realized, and the reliability of the whole system is improved.
In addition, the currents in the first bridge arm module and the second bridge arm module in the control system can be neutralized at the midpoint of the middle winding bridge arm, and the current flowing through the middle winding bridge arm is equal to the current which is not neutralized by the first bridge arm module and the second bridge arm module, so that the current flowing through the middle winding bridge arm can be obviously reduced, and the power loss and the heating of the system are further reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required in the description of the embodiments or the prior art:
FIG. 1 is a schematic structural diagram of a conventional five-axis magnetic suspension bearing;
FIG. 2 is a cross-sectional view of a radial bearing of a conventional magnetic suspension bearing;
FIG. 3 is a schematic structural diagram of a control system of a magnetic bearing according to one embodiment of the present invention;
FIG. 4 is a control schematic of a control system under normal conditions according to one embodiment of the present invention;
FIG. 5 is a control schematic of the control system under abnormal conditions according to one embodiment of the present invention;
fig. 6 is a schematic control logic diagram of a first leg module according to one embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details or with other methods described herein.
Fig. 1 shows a schematic structural diagram of a conventional five-axis magnetic suspension bearing.
As shown in fig. 1, the conventional five-axis magnetic suspension bearing controls a rotor to achieve complete suspension, two radial magnetic bearings and an axial magnetic bearing are required, electromagnetic forces with five degrees of freedom need to be controlled, and mutual coupling exists between the degrees of freedom.
Fig. 2 is a sectional view of a radial bearing of the magnetic bearing. As shown in FIG. 2, the existing bearing electromagnetic force is generally controlled by differential current, wherein i0Is a bias current, ixTo control the current, s0To balance the position air gap length. Under the condition that the magnetic field is determined, the magnetic field force and the air gap length controlled by the bearing magnet in a differential mode are related to the differential current, and the magnetic field force can be controlled by controlling the differential current, so that the position of the bearing is controlled.
The magnetic suspension bearing included in the magnetic suspension system provided by the invention can be suitable for the bearing, and the control system of the magnetic suspension bearing is connected with each coil in the bearing, so that the effective control of the electromagnetic force of each degree of freedom of the bearing is realized through the control of the circuit of each coil.
Fig. 3 shows a schematic structural diagram of a control system of the magnetic suspension bearing provided by the embodiment.
As shown in fig. 3, the control system of the magnetic suspension bearing provided by the present embodiment preferably: intermediate winding leg 301 and first and second leg modules 302 and 303 of identical construction. The first end of the middle winding arm 301 is connected to the positive terminal of the external dc power supply 300, the second end is connected to the negative terminal of the external dc power supply 301, and the third end is connected to the first end of each winding coil of the magnetic suspension bearing (i.e. the first ends of all winding coils of the magnetic suspension bearing are all connected to the third end of the middle winding arm 301).
In this embodiment, as shown in fig. 3, the middle winding bridge arm 301 preferably includes: a third switching transistor VT1 with anti-parallel diodes and a fourth switching transistor VT2 with anti-parallel diodes. The first terminal and the second terminal of the third switching transistor VT1 are respectively connected to the positive electrode of the external dc power source 300 and the first terminal of the fourth switching transistor VT2, and the second terminal of the fourth switching transistor VT2 is connected to the negative electrode of the external dc power source 300.
For example, when the switching tube is implemented by using an IGBT, the collector of the IGBT forms the first end of the switching tube, and the emitter thereof forms the second end of the switching tube. For the intermediate winding leg 301, the collector of the first IGBT forms the first end of the intermediate winding leg 301 to be connected to the positive pole of the external dc power supply 300, the emitter thereof is connected to the collector of the second IGBT and forms the third end of the intermediate winding leg 301 to be connected to the first end of each winding coil of the magnetic suspension bearing, and the emitter of the second IGBT forms the second end of the intermediate winding leg 301 to be connected to the negative pole of the external dc power supply 300.
Of course, in other embodiments of the present invention, the structure or device of the middle winding bridge arm 301 may also be implemented by using other reasonable structures or devices, which is not limited in the present invention.
In this embodiment, since first arm module 302 and second arm module 303 have the same structure, for convenience of description, the structure and the operation principle of each arm module will be described in detail below by taking first arm module 302 as an example.
As shown in fig. 3, in the present embodiment, first leg module 302 preferably includes a plurality of winding legs corresponding to the number of degrees of freedom of the magnetic bearing. For example, when the degree of freedom of the magnetic suspension bearing is 5, the number of winding legs included in each of first leg module 302 and second leg module 303 is 5. Of course, in other embodiments of the present invention, the number of winding legs included in each of first leg module 302 and second leg module 303 may be other corresponding values according to the different degrees of freedom of the magnetic suspension bearing.
In this embodiment, the first end and the second end of each winding bridge arm in the first bridge arm module 302 are respectively connected to the positive electrode and the negative electrode of the external dc power supply 300, and the third end thereof is connected to the second end of the corresponding winding coil.
Specifically, in this embodiment, the winding bridge arms have the same structure. Taking one of the winding legs as an example, the winding leg preferably includes: a first switching tube VT3 with anti-parallel diodes and a second switching tube VT4 with anti-parallel diodes. The first end of the first switching tube VT3 forms the first end of the winding bridge arm to connect with the positive electrode of the external dc power supply 300, the second end of the first switching tube VT3 connects with the first end of the second switching tube VT4 and forms the third end of the winding bridge arm to connect with the second end of the corresponding winding coil, and the second end of the second switching tube VT4 forms the second end of the winding bridge arm to connect with the negative electrode of the external dc power supply 300.
For example, when the switching tube is implemented by using an IGBT, the collector of the IGBT forms the first end of the switching tube, and the emitter thereof forms the second end of the switching tube. For the winding leg, the collector of the third IGBT forms the first end of the winding leg to be connected to the positive pole of the external dc power supply 300, the emitter thereof is connected to the collector of the fourth IGBT and forms the third end of the winding leg to be connected to the second end of the corresponding winding coil of the magnetic suspension bearing, and the emitter of the fourth IGBT forms the second end of the winding leg to be connected to the negative pole of the external dc power supply 300.
The structure and connection relationship of second bridge arm module 303 are similar to first bridge arm module 302, and therefore detailed description of second bridge arm module 303 is omitted here.
In this embodiment, the control system preferably further comprises a control module (not shown in the figure). The control module is connected to first bridge arm module 302 and second bridge arm module 303, and is capable of controlling the operating state of each switching tube in first bridge arm module 302 and second bridge arm module 303. Of course, according to actual needs, the control module may also be connected to the middle winding bridge arm 301, and it may also control the operating state of each switching tube in the middle winding bridge arm 301.
Specifically, in this embodiment, under a normal condition (for example, there is no abnormality in each switching tube in the control system), the control module preferably controls each first switching tube in the first bridge arm module 302 and each second switching tube in the second bridge arm module 303 to be in an operating state, and controls each second switching tube in the first bridge arm module 302 and each first switching tube in the second bridge arm module 303 to be in a non-operating state.
As shown in fig. 4, under normal conditions, the control module can control the current of each winding coil by controlling the upper switching tube of the first arm module 302, the lower switching tube of the second arm module 303 and the upper and lower switching tubes of the middle winding arm 301, so that the diodes in each arm can play a role of freewheeling. In this embodiment, in a normal condition, in a working process, currents flowing through the upper bridge arm of the first bridge arm module 302 and the lower bridge arm of the second bridge arm 303 may be neutralized at a midpoint of the middle winding bridge arm 301, so that currents in the switching tubes of the middle winding bridge arm are significantly reduced.
As shown in fig. 5, in this embodiment, in an abnormal state (for example, when there is a fault in the first switching tube in first bridge arm module 302 or the second switching tube in second bridge arm module 303), the control module preferably controls each first switching tube in first bridge arm module 302 and each second switching tube in second bridge arm module 303 to be in a non-operating state, and controls each second switching tube in first bridge arm module 302 and each first switching tube in second bridge arm module 303 to be in an operating state.
In the present embodiment, first bridge arm module 302 and second bridge arm module 303 are switched between upper and lower bridge arm operating states in an abnormal state, as compared with the operating states of first bridge arm module 302 and second bridge arm module 303 in a normal state. Meanwhile, because the electrical time constant of the circuit is far smaller than the mechanical time constant of the rotor, the switching process in the embodiment has little influence on the position control of the rotor, so that the fault-tolerant control can be realized.
In this embodiment, the control module preferably controls the operating state of the switching tube in the middle winding bridge arm 301 by using a preset fixed duty ratio. Meanwhile, preferably, the control module further controls the working state of each switching tube in the first bridge arm module and the second bridge arm module in a variable duty ratio mode.
Specifically, as shown in fig. 6, for the first leg module, when there is no abnormality in the control system, the control cycle of the first leg module preferably includes a positive-going conduction period, a negative-going conduction period, and a freewheel period.
During the forward conduction period, the control module preferably controls each upper bridge arm in the first bridge arm module 302 to be in a conduction state, and controls the lower bridge arm of the middle winding bridge arm 301 to be in a conduction state. At this time, the voltage drop across the corresponding winding coil in first bridge arm module 302 equals to bus voltage Vdc, and the current flowing through the winding coil will increase rapidly, so that the electromagnetic force generated by the winding coil increases.
During a negative conduction period, the control module preferably controls each upper leg of first leg module 302 and the lower leg of middle winding leg 301 to be in an off state. At this time, the voltage drop across the corresponding winding coil in first leg module 302 is equal to-Vdc, and the current flowing through the winding coil will decrease rapidly, so that the electromagnetic force generated by the winding coil decreases.
During the freewheeling period, in one case, the control module preferably will control each upper leg of first leg module 302 to be in a conducting state and control the lower leg of middle winding leg 301 to be in a disconnected state, with freewheeling being performed by the upper leg of middle winding leg 301. In another case, the control module may control each upper arm in the first arm module 302 to be in an off state, and each lower arm in the first arm module performs freewheeling, and simultaneously controls the lower arm of the middle winding arm 301 to be in an on state. In the follow current period, the voltage drop across the winding coil is equal to zero, the current flowing through the winding coil slowly decreases because of the follow current state, and the electromagnetic force generated by the winding coil is basically kept unchanged.
It should be noted that, in different embodiments of the present invention, the control cycle of the first bridge arm module may further only include a freewheel period and a positive conduction period or a negative conduction period according to actual needs, which is not specifically limited in the present invention.
The control principle and the control process of the second bridge arm module are similar to those of the first bridge arm module, so the control principle and the control process of the second bridge arm module are not described in detail herein.
As can be seen from the above description, compared with the existing magnetic suspension bearing control system, the control system of the magnetic suspension bearing provided by the present invention can switch the working states of the first bridge arm module and the second bridge arm module when the control system is abnormal (for example, a switching tube fails), so that the entire control system can still keep working normally, thereby implementing fault-tolerant control and improving the reliability of the entire system.
Meanwhile, for the existing magnetic suspension bearing with 10 coils, the number of power electronic switching tubes contained in the middle winding bridge arm, the first bridge arm module and the second bridge arm module in the control system can be as low as 11, so that the number of required switching tubes is obviously reduced, the size of the whole system can be effectively reduced, and the cost of the whole system can be reduced.
In addition, the currents in the first bridge arm module and the second bridge arm module in the control system can be neutralized at the midpoint of the middle winding bridge arm, and the current flowing through the middle winding bridge arm is equal to the current which is not neutralized by the first bridge arm module and the second bridge arm module, so that the current flowing through the middle winding bridge arm can be obviously reduced, and the power loss and the heating of the system are further reduced.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures or process steps disclosed herein, but extend to equivalents thereof as would be understood by those skilled in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
While the above examples are illustrative of the principles of the present invention in one or more applications, it will be apparent to those of ordinary skill in the art that various changes in form, usage and details of implementation can be made without departing from the principles and concepts of the invention. Accordingly, the invention is defined by the appended claims.
Claims (11)
1. A control system for a magnetic bearing, the system comprising:
the first end of the middle winding bridge arm is used for being connected with the anode of an external direct-current power supply, the second end of the middle winding bridge arm is used for being connected with the cathode of the external direct-current power supply, and the third end of the middle winding bridge arm is used for being connected with the first end of each winding coil of the magnetic suspension bearing;
the first bridge arm module comprises a plurality of winding bridge arms corresponding to the degree of freedom of the magnetic suspension bearing, a first end and a second end of each winding bridge arm are respectively connected with the anode and the cathode of the external direct-current power supply, and a third end of each winding bridge arm is connected with a second end of a corresponding winding coil;
each winding bridge arm in the first bridge arm module is identical in structure and comprises a first switch tube with an anti-phase parallel diode and a second switch tube with an anti-phase parallel diode, wherein the first end of the first switch tube forms the first end of the winding bridge arm to be connected with the anode of the external direct-current power supply, the second end of the first switch tube is connected with the first end of the second switch tube and forms the third end of the winding bridge arm to be connected with the second end of the corresponding winding coil, and the second end of the second switch tube forms the second end of the winding bridge arm to be connected with the cathode of the external direct-current power supply.
2. The system of claim 1, wherein the middle winding bridge arm comprises a third switching tube with anti-phase parallel diodes and a fourth switching tube with anti-phase parallel diodes, wherein the first end and the second end of the third switching tube are respectively connected with the anode of the external direct current power supply and the first end of the fourth switching tube, and the second end of the fourth switching tube is connected with the cathode of the external direct current power supply.
3. The system of claim 1, wherein the system further comprises:
and the control module is connected with the first bridge arm module and the second bridge arm module and is used for controlling the working state of each switching tube in the first bridge arm module and the second bridge arm module.
4. The system of claim 3, wherein under normal conditions, the control module is configured to control each first switching tube in the first leg module and each second switching tube in the second leg module to be in an active state, and to control each second switching tube in the first leg module and each first switching tube in the second leg module to be in a non-active state.
5. The system of claim 4, wherein when a fault exists in a first switch tube in the first leg module or a second switch tube in the second leg module, the control module is configured to control each first switch tube in the first leg module and each second switch tube in the second leg module to be in a non-operating state and control each second switch tube in the first leg module and each first switch tube in the second leg module to be in an operating state.
6. The system of claim 3, wherein the control module is further connected to the middle winding bridge arm and configured to control the operating states of the switching tubes in the middle winding bridge arm, and wherein the control module is configured to control the operating states of the switching tubes in the middle winding bridge arm with a preset fixed duty ratio.
7. The system of claim 6, wherein the control module is configured to control the operating state of each switching tube in the first leg module and the second leg module in a variable duty cycle manner.
8. The system of any one of claims 3 to 7, wherein for the first leg module, when there is no anomaly in the control system, the control cycle comprises a forward conduction period,
and in the forward conduction period, the control module is configured to control each upper bridge arm in the first bridge arm module to be in a conduction state and control a lower bridge arm of the middle winding bridge arm to be in a conduction state.
9. The system of claim 8, wherein for the first leg module, when there is no anomaly in the control system, the control cycle further comprises a negative-going conduction period,
and in the negative conduction period, the control module is configured to control each upper bridge arm in the first bridge arm module and the lower bridge arm of the middle winding bridge arm to be in a disconnected state.
10. The system of claim 8, wherein for said first leg module, when there is no anomaly in the control system, said control cycle further comprises a negative-going freewheel period during which,
the control module is configured to control each upper bridge arm in the first bridge arm module to be in a conducting state, control a lower bridge arm of the middle winding bridge arm to be in a disconnecting state, and enable the upper bridge arm of the middle winding bridge arm to carry out follow current; or the like, or, alternatively,
the control module is configured to control each upper bridge arm in the first bridge arm module to be in a disconnected state, and each lower bridge arm in the first bridge arm module performs follow current to control the lower bridge arm of the middle winding bridge arm to be in a connected state.
11. A magnetic levitation system, the system comprising:
a magnetic suspension bearing;
and a control system as claimed in any one of claims 1 to 10.
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| CN112815008B (en) * | 2021-03-22 | 2022-02-15 | 华中科技大学 | Magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topological circuit |
| CN112901658B (en) * | 2021-03-22 | 2021-12-03 | 华中科技大学 | Switch open circuit fault-tolerant control system for magnetic suspension bearing |
| CN114263677B (en) * | 2021-12-27 | 2022-12-02 | 华中科技大学 | Five-bridge-arm fault-tolerant control method and system applied to magnetic suspension bearing |
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| DE3819205A1 (en) * | 1987-12-12 | 1989-06-22 | Teldix Gmbh | Bearing for the radial and axial support of a rotor with a large radial extension |
| CN202798515U (en) * | 2012-08-10 | 2013-03-13 | 北京海斯德电机技术有限公司 | Magnetic bearing system switch power amplifier |
| CN106301036A (en) * | 2015-05-27 | 2017-01-04 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic suspension bearing switch power amplifier and control method thereof |
| CN107448476A (en) * | 2017-09-18 | 2017-12-08 | 华中科技大学 | A kind of opposite power electronic controller of electric current for multiaxis magnetic suspension bearing |
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