CN202550934U - Force control-based magnetic suspension system adopting radial magnetic bearings - Google Patents
Force control-based magnetic suspension system adopting radial magnetic bearings Download PDFInfo
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- CN202550934U CN202550934U CN2012202176014U CN201220217601U CN202550934U CN 202550934 U CN202550934 U CN 202550934U CN 2012202176014 U CN2012202176014 U CN 2012202176014U CN 201220217601 U CN201220217601 U CN 201220217601U CN 202550934 U CN202550934 U CN 202550934U
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Abstract
The utility model discloses a force control-based magnetic suspension system adopting radial magnetic bearings. A mechanical device of the force control-based magnetic suspension system comprises a motor, a shaft coupling, force-measuring bearings, two radial magnetic bearings and a rotor; a control system comprises a voltage amplifier, a controller and a power amplifier; the motor is connected with one end of the rotor through the shaft coupling, the force-measuring bearings are respectively arranged at the two ends of the rotor, and the two radial magnetic bearings are arranged between the two force-measuring bearings and respectively correspond to each other; and the input end of the voltage amplifier is connected with the force-measuring bearings, the output end of the voltage amplifier is connected with the input end of the controller, the output end of the controller is connected with the input end of the power amplifier, and the output end of the power amplifier is connected with the radial magnetic bearings. The force control-based magnetic suspension system disclosed by the utility model adopts a force control method to replace a displacement control method, can realize quasi-suspension of the rotor and reduce the complexity of a circuit system, has the advantages of simple structure, flexibility in operation and convenience in implementation, and is suitable for popularization.
Description
Technical field
The utility model relate to a kind of adopt radial magnetic bearing based on power control magnetic suspension system, belong to the magnetic levitation technology field.
Background technology
At present, in magnetic suspension control system, mainly depart from the displacement of its equilbrium position through the control rotor, realize the stable suspersion under the contactless state of rotor, this control system is referred to as the magnetic suspension system based on displacement control.Its cardinal principle is after going out rotor and depart from the displacement of reference point through sensor; Controller is transformed into control signal with detected displacement; Power amplifier converts this control signal to Control current then; Rotor turns back to original equilbrium position thereby Control current produces the magnetic force driving in carrying out electromagnet, keeps its stable suspersion invariant position.
Magnetic suspension system based on displacement control obtains application more and more widely in all kinds of high-speed rotating machines at present.It has no direct contact friction, need not lubricated and sealing and can ACTIVE CONTROL etc. advantage owing to do not have mechanical friction and wearing and tearing,, prolonged the useful life of bearing so reduced work energy consumption and noise; Kinetic equation loss is little, more is applicable to the occasion that runs up; Since do not need lubricating system, thus pollution-free, can be applicable to the vacuum ultra-clean, particular job environment such as Korrosionsmedium and extreme temperature and pressure.
Yet; Along with accurate rotor develops towards high-speed, high accuracy, automation and intelligentized direction; Tradition can not satisfy the demand of high speed and precision rotor based on the performance of the magnetic suspension system of displacement control, because have following shortcoming based on the magnetic suspension system of displacement control: the first, the magnetic suspension system essence of controlling based on displacement is time-dependent system; Must take control measure to guarantee system stability, the Control System Design difficulty is big; The second, when power down took place, falling suddenly to rotor and the very big impact of magnetic bearing generation of rotor can bring fatal harm to rotor and magnetic bearing based on the magnetic suspension system of displacement control.For fear of magnetic suspension system is damaged, supplementary protection bearing and power-down protection apparatus must be provided, system complex, cost height; The 3rd; Displacement transducer based on the magnetic suspension system of displacement control can not be directly installed on the magnetic bearing position; Thereby can not directly record the displacement at magnetic bearing place, this not only causes intercoupling between each sensor signal, reduces control precision; And it is very complicated that mechanical structure and control system also become; The 4th, be limited by the machining accuracy on rotating shaft surface and the amount of deflection of rotating shaft based on the displacement sensor precision of the magnetic suspension system of displacement control; The 5th, owing to only provide, therefore be difficult to obtain very high bearing capacity by magnetic bearing based on the bearing capacity of the magnetic bearing of the magnetic suspension system of displacement control, also be difficult to realize high rigidity; The 6th; Before the magnetic suspension rotor stable suspersion, need provide the bigger buoyancy that rises to be used for overcoming gravity based on the magnetic suspension system of displacement control, just need the bigger floating electric current that rises be provided to electromagnet; Just can make rotor reach stable levitation position, therefore control system had relatively high expectations.
Because the magnetic suspension system based on displacement control has above-mentioned shortcoming, this to a great extent limit the development of high speed and precision rotor, therefore, prior art awaits to improve and development.
The utility model content
The utility model is in order to overcome the deficiency of above technology; To the performance that exists in the existing magnetic suspension control system and the deficiency of design aspect; Aim to provide a kind of adopt radial magnetic bearing based on power control magnetic suspension system, this The measuring precision is high, can guarantee control precision; Bearing capacity is strong, and rigidity is high.
The technical scheme that its technical problem of the utility model solution is taked is: that adopts radial magnetic bearing controls magnetic suspension system based on power; It is characterized in that; Comprise mechanical device and control system; Said mechanical device comprises motor, shaft coupling, force-measuring bearing, two radial magnetic bearings and rotor, and said control system comprises voltage amplifier, controller and power amplifier; Said motor is connected with rotor one end through shaft coupling, and the two ends of said rotor are respectively arranged with force-measuring bearing, and said two radial magnetic bearings are arranged between two force-measuring bearings and are corresponding with it respectively; The input of said voltage amplifier is connected with force-measuring bearing, and output is connected with the input of controller, and the output of said controller is connected with the input of power amplifier, and the output of said power amplifier is connected with radial magnetic bearing.
Said radial magnetic bearing 4 adopts differential mode to connect.
Said force-measuring bearing acts on the radial load on the force-measuring bearing in order to measure rotor.
Compared with prior art, the utlity model has following beneficial effect: this system configuration is simple, flexible operation, and stable performance, design of Controller is simple; Rotor and force-measuring bearing are in accurate suspended state, and the antifriction ability can be controlled magnetic suspension bearing with displacement and match in excellence or beauty, and the antifriction resistance-reducing performance can be controlled magnetic suspension bearing with displacement and match in excellence or beauty, and have few no friction equally, advantage of low energy consumption; Directly dynamometry does not receive the influence of precision with the amount of deflection of axle of a finished surface, and certainty of measurement is high, can guarantee control precision; Only need Control current, need not bias current, power supply is simple, and cost is low; Can cancel auxiliary bearing, designs simplification, the self-protection effect when itself just has power down; Force-measuring bearing not only has the dynamometry function, but also plays the effect of the bearing of support rotor, and bearing capacity is strong, rigidity is high.
Description of drawings
Fig. 1 is the control principle block diagram of the utility model;
Fig. 2 is the structural representation of the utility model;
Among the figure: 1 spindle motor, 2 shaft couplings, 3 force-measuring bearings, 4 radial magnetic bearings, 5 rotors.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further to describe:
As depicted in figs. 1 and 2; A kind of adopt radial magnetic bearing based on power control magnetic suspension system; Comprise mechanical device and control system; Said mechanical device comprises motor 1, shaft coupling 2, force-measuring bearing 3, two radial magnetic bearings 4 and rotors 5, and said control system comprises voltage amplifier, controller and power amplifier.Said motor 1 is connected with rotor 5 one ends through shaft coupling 2, and the two ends of said rotor 5 are respectively arranged with force-measuring bearing 3, and said two radial magnetic bearings 4 are arranged between two force-measuring bearings 3 and are corresponding with it respectively; The input of said voltage amplifier is connected with force-measuring bearing, and output is connected with the input of controller, and the output of said controller is connected with the input of power amplifier, and the output of said power amplifier is connected with radial magnetic bearing 4.Wherein, said radial magnetic bearing 4 adopts differential mode to connect.
On the one hand, 3 of said force-measuring bearings are measured rotor 5 and are acted on the radial load on the force-measuring bearing 3.On the other hand, said force-measuring bearing 3 can replace the traditional protection bearing, plays the effect of the bearing of supporting rotor 5, and is connected with the voltage amplifier that force signal is converted into voltage signal.
In order to protect rotor 5 and radial magnetic bearing 4, said force-measuring bearing 3 is to be formed by the sliding bearing transformation of the way.
The operation principle of the utility model: this kind adopt radial magnetic bearing based on power control magnetic suspension system, structurally, the cancellation auxiliary bearing; Adopt the force-measuring bearing 3 that possesses dynamometry and support functions simultaneously, on implementation method, act on the power on the force-measuring bearing 3 through balance electromagnetic force and rotor 5; Realize the rotor 5 accurate purposes that suspend; Its operation principle is following: said force-measuring bearing 3 acts on the size and Orientation of power above that in order to detection rotor 5, and detected force signal is sent to voltage amplifier, and said voltage amplifier amplifies the force signal that receives and sends to controller after being transformed to voltage signal; Said controller sends to power amplifier after converting voltage signal to control signal; Said power amplifier converts control signal to the Control current signal and sends to the differential radial magnetic bearing 4 of arrangement for producing electromagnetic force, and radial magnetic bearing 4 produces and acts on the magnetic control on the rotor 5, and this control and rotor 5 act in the opposite direction, the equal and opposite in direction of the power on the force-measuring bearing 3; Thereby the power that makes rotor 5 act on the force-measuring bearing 3 approaches zero; According to formula F=μ N (F representes the frictional force between rotor and the power transducer, and μ representes coefficient of friction, and N representes that rotor acts on the pressure on the power transducer); The frictional force that obtains between rotor 5 and the force-measuring bearing 3 is close to zero; Obtain between rotor 5 and the force-measuring bearing 3 almost friction free effect, keep between rotor 5 and the force-measuring bearing 3 and seemingly contact non-contacting state, realize the certainly suspension of rotor 5.
The above; Some principles of the utility model just explain through diagrams; This specification be not be to the utility model be confined to shown in described concrete structure and the scope of application; So every the modify and equivalent that might be utilized all belongs to the claim that the utility model is applied for.
Except that the said technical characterictic of specification, all the other technical characterictics are those skilled in the art's known technology.
Claims (3)
1. that adopts radial magnetic bearing controls magnetic suspension system based on power; It is characterized in that; Comprise mechanical device and control system; Said mechanical device comprises motor, shaft coupling, force-measuring bearing, two radial magnetic bearings and rotor, and said control system comprises voltage amplifier, controller and power amplifier; Said motor is connected with rotor one end through shaft coupling, and the two ends of said rotor are respectively arranged with force-measuring bearing, and said two radial magnetic bearings are arranged between two force-measuring bearings and are corresponding with it respectively; The input of said voltage amplifier is connected with force-measuring bearing, and output is connected with the input of controller, and the output of said controller is connected with the input of power amplifier, and the output of said power amplifier is connected with radial magnetic bearing.
2. employing radial magnetic bearing according to claim 1 based on power control magnetic suspension system, it is characterized in that said radial magnetic bearing 4 adopts differential mode to connect.
3. employing radial magnetic bearing according to claim 1 based on power control magnetic suspension system, it is characterized in that said force-measuring bearing acts on the radial load on the force-measuring bearing in order to measure rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202176014U CN202550934U (en) | 2012-05-12 | 2012-05-12 | Force control-based magnetic suspension system adopting radial magnetic bearings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202176014U CN202550934U (en) | 2012-05-12 | 2012-05-12 | Force control-based magnetic suspension system adopting radial magnetic bearings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202550934U true CN202550934U (en) | 2012-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202176014U Expired - Fee Related CN202550934U (en) | 2012-05-12 | 2012-05-12 | Force control-based magnetic suspension system adopting radial magnetic bearings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202550934U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111226612A (en) * | 2020-02-28 | 2020-06-05 | 江苏大学 | Electromagnetic drive suspension closed threshing device and harvester |
-
2012
- 2012-05-12 CN CN2012202176014U patent/CN202550934U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111226612A (en) * | 2020-02-28 | 2020-06-05 | 江苏大学 | Electromagnetic drive suspension closed threshing device and harvester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20150512 |
|
| EXPY | Termination of patent right or utility model |