CN204392118U - A kind of three pole magnetic bearing operating control devices based on matrix converter - Google Patents
A kind of three pole magnetic bearing operating control devices based on matrix converter Download PDFInfo
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- CN204392118U CN204392118U CN201420669976.3U CN201420669976U CN204392118U CN 204392118 U CN204392118 U CN 204392118U CN 201420669976 U CN201420669976 U CN 201420669976U CN 204392118 U CN204392118 U CN 204392118U
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Abstract
The utility model discloses a kind of three pole magnetic bearing operating control devices based on matrix converter, input electric power detection module output in turn connection matrix converter, Hall current sensor and three pole magnetic bearings; Input electric power detection module, Hall current sensor and the equal connection signal modulate circuit of displacement detection module, signal conditioning circuit exports connection control circuit, isolation drive protective circuit successively, and isolation drive protective circuit exports 9 bidirectional switchs of connection matrix converter; By the break-make of nine bidirectional switch pipes of gating matrix converter, with the output current of matrix converter for controlled volume Direct driver three pole magnetic bearing, there is no the DC side bulky capacitor energy storage link of traditional drived control three pole magnetic bearing, add reliability; Three-phase input voltage is divided into 12 phase regions, makes each input within the whole cycle, participate in modulation, improve input current waveform, reduce input side current harmonics.
Description
Technical field
The utility model relates to a kind of three pole magnetic bearing Drive Control Technique, is specifically related to control device matrix converter being applied to driving three pole magnetic bearing, belongs to high-speed electric expreess locomotive transmission field.
Background technology
Magnetic bearing utilizes magnetic field force to be contactlessly suspended in by rotor in the air, and levitation position can be controlled by control system.Compared with traditional bearing, magnetic bearing has possessed without fretting wear, without the need to lubrication, many outstanding advantages such as rotating speed is high, precision is high, the life-span is long, magnetic suspension bearing is applied in fields such as centrifugal separator, high-speed precision digital control lathe, electromechanical cell, turbo generator, turbomolecular pump, life sciences in recent years.
For three pole mixing or active magnetic bearings, by magnetic equivalent circuit method or the Mathematical Modeling based on Maxwell tensor method foundation, the Mathematical Modeling that the rotor of three pole magnetic bearings is stressed is self gravitation, the product of power/displacement coefficient and displacement, the product three sum of power/current coefficient and electric current, the rotor displacement information of the magnetic bearing of controller receiving sensor feedback, according to the stressed expression formula of the rotor of magnetic bearing, the output current of control inverter after calculation process is carried out in controller inside, the electromagnetic force that three magnetic poles of three pole magnetic bearings can be made to produce makes the stressed balance that reaches of rotor, and then make the rotor stability of three pole magnetic bearings be suspended in equilbrium position.The traditional drived control hardware configuration form of three pole magnetic bearings adopts AC rectification to become direct current, then becomes alternating current by DC inverter, or is directly reverse into the version of alternating current by direct current.But the DC side of inversion link exists energy storage bulky capacitor in traditional drived control version, the shortcomings such as generally select electrochemical capacitor at present, it is short that electrochemical capacitor exists the life-span, and volume is large, once damage can have an impact to inverter, reduce the reliability of device.
Three-phase-three-phase matrix converter adopts the switch matrix array structure form of 3 × 3, is made up of, is controlled the break-make of these 9 bidirectional switchs by controller 9 bidirectional switchs, can obtain the output current of expectation and voltage to control controlled device.The advantages such as matrix converter containing storage capacitor, does not have compact conformation, power density is high, stability is high, energy capable of bidirectional flowing, long service life, directly can convert AC energy, there is not the bulky capacitor energy storage link of DC side.At present, matrix converter can be applicable to the fields such as motor AC transmission, electrical network transformation of electrical energy, Switching Power Supply.The traditional matrix converter method for controlling hysteresis loop current be applied in permagnetic synchronous motor is, at the natural commutation point place of three-phase input sinusoidal voltage, voltage is divided into 6 phase regions, now there is a voltage max phase, a voltage minimum phase in each phase region of input voltage, when determining the on off state of matrix converter, according to the stagnant chain rate of three-phase output current compared with result, export and be connected with minimum value with the maximum phase of input mutually only.The shortcoming of this method is: each input has the time of 1/3 not participate in modulation mutually, can make mains side Harmonics of Input rich content.Three pole magnetic bearings are similar to the characteristic of permagnetic synchronous motor, and its coil can regard the concentratred winding on motor stator as, and its coil is resistance sense load, and therefore, the method also can be used for driving three pole magnetic bearing, but can make mains side Harmonics of Input rich content.
Summary of the invention
The purpose of this utility model is the defect existed for the Drive Control Technique that three pole magnetic bearings are traditional, a kind of three pole magnetic bearing operating control devices based on matrix converter are proposed, three-phase-three-phase matrix converter is utilized to tap into row transformation of electrical energy to alternating current direct, there is not the bulky capacitor energy storage link of DC side, improve three pole magnetic bearing reliabilities of operation.
The technical solution adopted in the utility model is: comprise a three-phase regulator, three-phase regulator output in turn connects three-phase LC filter and input electric power detection module, input electric power detection module output in turn connection matrix converter, Hall current sensor and three pole magnetic bearings, three pole magnetic bearings are provided with displacement detection module; Matrix converter adopts the switch matrix array format of 3 × 3 to form by 9 bidirectional switchs; input electric power detection module, Hall current sensor and the equal connection signal modulate circuit of displacement detection module; signal conditioning circuit exports connection control circuit, isolation drive protective circuit successively, and isolation drive protective circuit exports connection 9 bidirectional switchs.
Compared with prior art, the utility model has the advantage of:
1, the utility model utilizes three-phase-three-phase matrix converter directly to convert electric energy, using DSP and CPLD as controller, by the break-make of nine bidirectional switch pipes of gating matrix converter, with the output current of matrix converter for controlled volume Direct driver three pole magnetic bearing, through the closed-loop adjustment of whole control device, adopt Double hysteresis current control method, what make the rotor stability of three pole magnetic bearings is suspended in equilbrium position.The utility model does not have the DC side bulky capacitor energy storage link of traditional drived control three pole magnetic bearing, adds reliability.
2, the utility model is divided into 12 phase regions three-phase input voltage, makes each input within the whole cycle, participate in modulation, improves input current waveform, reduce input side current harmonics.
3, the utility model is applicable to drive all three pole mixing or active magnetic bearings, and three pole mixing or active magnetic bearings with magnetic equivalent circuit method or based on Maxwell tensor method founding mathematical models, can have versatility; Magnetic bearing is more widely used in numerous special electric transmission fields such as high-speed precision digital control lathe, centrifugal separator, electromechanical cell, turbo generator, turbomolecular pump.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is the structured flowchart of a kind of three pole magnetic bearing operating control devices based on matrix converter of the utility model;
Fig. 2 is three kinds of conventional bi-directional switch structure figure in Fig. 1 in matrix converter, wherein, a shown in () figure is IGBT common emitter configuration figure, shown in (b) figure is IGBT common collector configuration figure, and shown in (c) figure is IGBT bridge architecture figure;
Fig. 3 is the absorption protective circuit schematic diagram in Fig. 1 in isolation drive protective circuit;
Fig. 4 is the control principle drawing of operating control device shown in Fig. 1.
In figure: 1. three-phase regulator; 2. three-phase LC filter; 3. input electric power detection module; 4. matrix converter; 5. Hall current sensor; 6. three pole magnetic bearings; 7. displacement detection module; 8. signal conditioning circuit; 9. control circuit; 10. isolation drive protective circuit; 91,92. PID arithmetic modules; 93,95. 2/3 conversion modules; 94. power/current transformation module; 96. on off state change of current logic modules.
Embodiment
See Fig. 1, a kind of three pole magnetic bearing operating control devices based on matrix converter of the utility model comprise a three-phase regulator 1, and the output of three-phase regulator 1 in turn connects three-phase LC filter 2, input electric power detection module 3, three-phase-three-phase matrix converter 4, Hall current sensor 5, three pole magnetic bearing 6.Matrix converter 4 adopts the switch matrix array format of 3 × 3 to form by 9 bidirectional switchs.Three-phase regulator 1 connects three-phase mains and forms input power, three-phase LC filter 2 inputs termination three-phase regulator 1, three-phase LC filter 2 exports termination input electric power detection module 3, input electric power detection module 3 exports termination matrix converter 4, the output termination Hall current sensor 5 of matrix converter 4.The electric current that Hall current sensor 5 monitoring matrix converter 4 exports, the electric current supply three pole magnetic bearing 6 that matrix converter 4 exports.Three pole magnetic bearings 6 install displacement detection module 7, and displacement detection module 7 detects the rotor displacement information of magnetic bearing.
Input electric power detection module 3, Hall current sensor 5 and displacement detection module 7 all connection signal modulate circuits 8, all send output signal into signal conditioning circuit 8.Output connection control circuit 9, the isolation drive protective circuit 10 successively of signal conditioning circuit 8.9 bidirectional switchs of the output connection matrix converter 4 of isolation drive protective circuit 10.Control circuit 9 is control circuits of integrated DSP and CPLD, accepts the signal from signal conditioning circuit 8, through internal algorithm process, delivers to isolation drive protective circuit 10,9 bidirectional switchs of isolation drive protective circuit 10 drived control matrix converter 4.
Three pole magnetic bearings 6 comprise three pole hybrid magnetic bearing or active magnetic bearings, and adopt Y-connection mode, therefore output current only need detect two-phase, another phase output current can pass through detected biphase current and calculate.Displacement transducer in displacement detection module 7 adopts eddy current displacement sensor.Eddy current displacement sensor in displacement detection module 7 is arranged on the housing of three pole magnetic bearings 6, two eddy current displacement sensors are a pair, be placed in x direction and the y direction of three pole magnetic bearings 6 respectively, two eddy current displacement sensors do Differential Detection to rotor displacement, improve the precision that rotor displacement detects.
See Fig. 2, what the structure of the bidirectional switch in matrix converter 4 was conventional has three kinds, the IGBT common emitter configuration as shown in Fig. 2 (a) respectively, the IGBT common collector configuration as shown in Fig. 2 (b), the IGBT bridge architecture as shown in Fig. 2 (c).
See Fig. 3, containing absorbing protective circuit in isolation drive protective circuit 10, absorb protective circuit as shown in Figure 3, by resistance R
1, electric capacity C
1, insulated gate bipolar transistor IGBT
1and 12 fast diode VD
5-VD
16the double sided rectification bridge composition formed.Absorbing protective circuit one end is connected across between three-phase LC filter 2 and input electric power detection module 3, the middle lead-out wire of the side rectifier bridge namely in Fig. 3
u a,
u b,
u cwith Fig. 1
u a,
u b,
u ccorresponding connection, absorbs between protective circuit other end cross-over connection matrix converter 4 and Hall current sensor 5, the opposite side rectifier bridge namely in Fig. 3
u a,
u b,
u cwith Fig. 1
u a,
u b,
u ccorresponding connection.In normal working conditions, absorb protective circuit and be responsible for leakage inductance energy storage, the due to voltage spikes produced in simultaneously stability bidirectional switch make and break process; When the unexpected power down of system, excess temperature, overload or short-circuit protection, under protection situation, nine bidirectional switchs of matrix converter 4 all close and have no progeny, for inductive load provides the buffer channel released energy.
Shown in Figure 4, control circuit 9 is made up of 2 PID arithmetic modules, 91,92,2 2/3 conversion modules, 93,95,1 power/current transformation modules 94 and 1 on off state change of current logic 96 module; Wherein 2/3 conversion module 93 is three pole magnetic bearing 6 three-phase currents based on star-like connection and null conversion, and 2/3 conversion module 95 is based on coordinate transform.The output of 2 PID arithmetic modules 91,92 connects the input of 1 power/current transformation module 94 respectively, and the output of power/current transformation module 94 connects the input of 2/3 conversion conversion module 95.The output of on off state change of current logic 96 module connects isolation drive protective circuit 10.The rotor of the three pole magnetic bearings 6 detected by displacement detection module 7 is at the displacement information in x direction and y direction
x,
ywith given displacement signal after signal conditioning circuit 8 exports
x *,
y *make comparisons, the displacement comparative result input PID arithmetic module 92 in displacement comparative result input PID arithmetic module 91, the y direction in x direction.The biphase current size of the output of the matrix converter 4 that Hall current sensor 5 detects inputs three current signals of 2/3 conversion module 93,2/3 conversion module 93 output after signal conditioning circuit 8
i a,
i b,
i c, convert with 2/3 the given current signal of three-phase that conversion module 95 exports
i a *,
i b *,
i c *size relatively after equal input switch state change of current logic 96 modules.
The utility model is when realizing stable suspersion and controlling to three pole magnetic bearings, first three-phase regulator 1 to be regulated, the voltage of three-phase mains is reduced, because specific to the magnetic bearing of specific radial bearing capacity, electric current for making needed for rotor suspension can be calculated according to the stressed expression formula of its rotor and rotor peak excursion displacement meter, and then the size of estimation three-phase input voltage.If the electric current flowing through three pole magnetic bearings 6 too conference damages the insulation of wire, and then affects the life-span of three pole magnetic bearings 6.So in actual mechanical process, should use three-phase regulator 1 that the voltage of three-phase mains is reduced.
Through voltage input matrix converter 4 after three-phase LC filter 2, input electric power detection module 3 that three-phase regulator 1 exports, the phase voltage of input matrix converter 4 is three phase sine voltage.Detected the three phase sine voltage of input by the linear optocoupler in input electric power detection module 3, through signal conditioning circuit 8, input voltage value is adjusted to 0-3.3V, the DSP sent in control circuit 9 carries out A/D sampling.
DSP is according to the three phase sine voltage value size of input, using the intersection point of any two joinings and phase voltage and no-voltage as line of demarcation, input three phase sine voltage is divided into 12 phase regions, now, there is a voltage max phase in each phase region, a voltage median phase and a voltage minimum phase.
Eddy current displacement sensor in displacement detection module 7 is the displacement information of the rotor of three pole magnetic bearings 6 in x direction and y direction
x,
ysend into DSP through signal conditioning circuit 8 and carry out A/D sampling (Fig. 4 only schematically show two eddy current displacement sensors),
x,
ysignal is inner and given displacement signal at DSP
x *,
y *make comparisons, after PID arithmetic, export x direction, y direction electromagnetic force respectively
f x,
f y, according to the stressed expression formula of rotor of three pole magnetic bearings 6, electromagnetic force
f x,
f yx direction and y direction controlling current signal is calculated respectively after power/current transformation computing
i xc,
i yc, control current signal
i xc,
i ycthe given current signal of three-phase is obtained respectively again after 2/3 transform operation
i a *,
i b *,
i c *.
The biphase current size of the output of Hall current sensor 5 monitoring matrix converter 4, send into DSP through signal conditioning circuit 8 and carry out A/D sampling, obtain another phase current signal through inner 2/3 transform operation of DSP, so just obtain three current signals of input three pole magnetic bearing 6
i a,
i b,
i c, current signal given with three-phase
i a *,
i b *,
i c *size after determine stagnant ring status, again according to the phase region that now voltage is corresponding, through internal algorithm process, by the break-make of CPLD decoding circuit drived control nine bidirectional switchs, matrix converter 4 is made to export the control current signal expected, the electromagnetic force that inner three magnetic poles of three pole magnetic bearings 6 are produced overcomes magnetic pull and the rotor self gravitation of rotor eccentricity generation, and what finally make the rotor stability of three pole magnetic bearings 6 is suspended in equilbrium position, exports control signal.
Two stagnant chain rate, more namely on the basis of traditional hysteretic loop current control, is divided into dicyclo current hysteresis-band control, and for A phase, B, C phase duplicates with A phase, repeats no more.Matrix converter 4 exports A phase current
i a, the stagnant ring ring width of inner ring is
h 1, the stagnant ring ring width of outer shroud is
h 2, when
i a *-
i a>
h 2time, the A of three pole magnetic bearings 6 connects voltage maximal phase, the corresponding switch of conducting; When
h 1<
i a *-
i a<
h 2time, the A voltage status that phase connects of three pole magnetic bearings 6 is constant; When-
h 1<
i a *-
i a<
h 1time, A connects voltage median phase; When-
h 2<
i a *-
i a<-
h 1time, the A voltage status that phase connects of three pole magnetic bearings 6 is constant; When
i a *-
i a<-
h 2time, the A of three pole magnetic bearings 6 connects voltage minimum phase.The process that matrix converter 4 output current reduces in contrast.
CPLD receives the control signal exported from DSP; the change of current of matrix converter 4 is completed through the logic of inner setting; the special drive circuit of IGBT through isolation drive protective circuit 10; the break-make of nine bidirectional switchs in isolation drive gating matrix converter 4, the electric current that matrix converter 4 is exported is around given electric current
i a *,
i b *,
i c *do zigzag change among a small circle, the electromagnetic force that inner three magnetic poles of three pole magnetic bearings 6 are produced overcomes magnetic pull and the rotor self gravitation of rotor eccentricity generation, and what finally make the rotor stability of three pole magnetic bearings 6 is suspended in equilbrium position.
Claims (5)
1. three pole magnetic bearing operating control devices based on matrix converter, comprise a three-phase regulator (1), three-phase regulator (1) output in turn connects three-phase LC filter (2) and input electric power detection module (3), three pole magnetic bearings (6) are provided with displacement detection module (7), it is characterized in that: input electric power detection module (3) output in turn connection matrix converter (4), Hall current sensor (5) and three pole magnetic bearings (6); Matrix converter (4) adopts the switch matrix array format of 3 × 3 to form by 9 bidirectional switchs; input electric power detection module (3), Hall current sensor (5) and displacement detection module (7) be connection signal modulate circuit (8) all; signal conditioning circuit (8) exports connection control circuit (9), isolation drive protective circuit (10) successively, and isolation drive protective circuit (10) exports connection 9 bidirectional switchs.
2. three pole magnetic bearing operating control devices according to claim 1, it is characterized in that: control circuit (9) is made up of 2 PID arithmetic modules (91,92), 2 2/3 conversion modules (93,95), 1 power/current transformation module (94) and 1 on off state change of current logic (96) module, the output of 2 PID arithmetic modules (91,92) connects the input of 1 power/current transformation module (94) respectively, and the output of power/current transformation module (94) connects the input of first 2/3 conversion module (95); The displacement information of rotor in x, y direction of three pole magnetic bearings (6)
x,
ythrough signal conditioning circuit (8) export after respectively with given displacement signal
x *,
y *make comparisons, the displacement comparative result in x direction inputs first PID arithmetic module (91), and the displacement comparative result in y direction inputs second PID arithmetic module (92); The current signal that matrix converter (4) exports inputs second 2/3 conversion module (93) after modulate circuit (8), three current signals that second 2/3 conversion module (93) exports
i a,
i b,
i cthe given current signal of three-phase exported with first 2/3 conversion module (95)
i a *,
i b *,
i c *size relatively after all input switch state changes of current logical circuit (96), the output of on off state change of current logical circuit (96) connects isolation drive protective circuit (10).
3. three pole magnetic bearing operating control devices according to claim 2, it is characterized in that: control circuit (9) is using the intersection point of any two joinings and phase voltage and no-voltage as line of demarcation, the three-phase voltage of feeding is divided into 12 phase regions, each phase region has a voltage max phase, a voltage median phase and a voltage minimum phase.
4. three pole magnetic bearing operating control devices according to claim 3, is characterized in that: three current signals
i a,
i b,
i ccurrent signal given with three-phase
i a *,
i b *,
i c *make two stagnant chain rate comparatively, controlled the break-make of 9 bidirectional switchs simultaneously according to phase region corresponding to voltage by isolation drive protective circuit (10).
5. three pole magnetic bearing operating control devices according to claim 1; it is characterized in that: containing the absorption protective circuit that the double sided rectification bridge be made up of resistance, electric capacity, insulated gate bipolar transistor and 12 fast diodes form in isolation drive protective circuit (10), absorb protective circuit one end and be connected across three-phase LC filter (2) and input between electric power detection module (3), between other end cross-over connection matrix converter (4) and Hall current sensor (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420669976.3U CN204392118U (en) | 2014-11-12 | 2014-11-12 | A kind of three pole magnetic bearing operating control devices based on matrix converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420669976.3U CN204392118U (en) | 2014-11-12 | 2014-11-12 | A kind of three pole magnetic bearing operating control devices based on matrix converter |
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| CN204392118U true CN204392118U (en) | 2015-06-10 |
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| CN201420669976.3U Withdrawn - After Issue CN204392118U (en) | 2014-11-12 | 2014-11-12 | A kind of three pole magnetic bearing operating control devices based on matrix converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485852A (en) * | 2014-11-12 | 2015-04-01 | 江苏大学 | Matrix converter-based three-pole magnetic bearing operation control system and method |
| CN114738384A (en) * | 2022-03-21 | 2022-07-12 | 中国舰船研究设计中心 | Driving device, control device and method of electric excitation type three-pole magnetic suspension bearing |
| CN114810825A (en) * | 2022-03-30 | 2022-07-29 | 清华大学 | Magnetic bearing, control method and device |
-
2014
- 2014-11-12 CN CN201420669976.3U patent/CN204392118U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485852A (en) * | 2014-11-12 | 2015-04-01 | 江苏大学 | Matrix converter-based three-pole magnetic bearing operation control system and method |
| CN104485852B (en) * | 2014-11-12 | 2016-06-22 | 江苏大学 | A kind of three pole magnetic bearing operation control system and methods based on matrix converter |
| CN114738384A (en) * | 2022-03-21 | 2022-07-12 | 中国舰船研究设计中心 | Driving device, control device and method of electric excitation type three-pole magnetic suspension bearing |
| CN114810825A (en) * | 2022-03-30 | 2022-07-29 | 清华大学 | Magnetic bearing, control method and device |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150610 Effective date of abandoning: 20160622 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |