CN105317837A - Magnetic suspension bearing system and control circuit thereof - Google Patents
Magnetic suspension bearing system and control circuit thereof Download PDFInfo
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- CN105317837A CN105317837A CN201410287386.9A CN201410287386A CN105317837A CN 105317837 A CN105317837 A CN 105317837A CN 201410287386 A CN201410287386 A CN 201410287386A CN 105317837 A CN105317837 A CN 105317837A
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Abstract
The invention relates to a magnetic suspension bearing system and a control circuit thereof, wherein the control system is suitable for controlling axial suspension height of a magnetic suspension. The magnetic suspension bearing control circuit includes: a switching module, a DC power supply module, an AC power supply module, a first sensing unit, a cable, a second sensing unit, a sensing module and a processing module. When the magnetic suspension bearing is started, the DC power supply module is conducted with the switching module; the DC power supply module outputs a first DC voltage and provides the first DC voltage to the first sensing unit, the cable and the second sensing unit, so that the sensing module detects line resistance values of the cable and the second sensing unit and provides the line resistance values to the processing module; and when the processing module determines that the line resistance values are in a default range, the processing module controls the switching module to be switched to conduct the AC power supply module with the switching module. The control circuit can accurately control the axial suspension height of an axial active magnetic suspension bearing.
Description
Technical field
The present invention is a kind of magnetic suspension bearing system and control circuit thereof, particularly a kind of about Control Shaft to floating high magnetic suspension bearing system and control circuit thereof.
Background technique
Magnetic bearing is the bearing of the running shaft for supporting pumping in a non contact fashion, such as, be used in turbo-molecular pumping etc.Wherein magnetic bearing has high rotation speed running, it doesn't matter bearing wear and the feature such as does not need lubricant oil and need not keep in repair.And the axis that running shaft movably can be controlled in X-axis, Y-axis, Z axis or radial axle by magnetic bearing is floating high.
But elastic cable paper also exists electrostatic capacity, wherein electrostatic capacity can change to some extent along with the length of elastic cable paper.The electrostatic capacity of the elastic cable paper of such as 15 meters can be greater than the electrostatic capacity of the elastic cable paper of 5 meters, or the electrostatic capacity of the elastic cable paper of 15 meters can be less than the electrostatic capacity of the elastic cable paper of 30 meters.Wherein, existing magnetic bearing is with an elastic cable paper of fixed length to adjust sensing circuit, such as with the elastic cable paper of 15 meters for benchmark.In other words, existing magnetic bearing can only compensate the line resistance value of the elastic cable paper of fixed length.
For example, carry out after adjustment compensates with the elastic cable paper of length 15 meters in factory, if but reality need elastic cable paper with 5 meters or 30 meters time, existing magnetic bearing still carries out adjustment compensation with the elastic cable paper of 15 meters, affects actual axle whereby to floating height.Such as the actual measurement axis that axially floating height can have between positive/negative 2 ~ 3 floats High Defferential.Therefore, existing magnetic bearing will cause the floating upper position that cannot correctly detect by floating upper body, and according to the above-mentioned floating upper position calculating mistake, impact controls by the floating upper position of floating upper body.
In addition, existing magnetic bearing adjusts variable-resistance mode to compensate, and wherein variable-resistance resistance may because manufacturing or life of product and difference to some extent, and then impact is axially floating high or fall the situation of machine.
Summary of the invention
The invention reside in and a kind of magnetic suspension bearing system and control circuit thereof are provided, when magnetic bearing is started shooting at every turn, first provide VDC to magnetic bearing and sense line resistance value with DC power supplier, and according to sensing result as the foundation controlling magnetic bearing, reach Control Shaft accurately whereby and float high object to the axis of radial active magnetic bearing.
The embodiment of the present invention proposes a kind of magnetic bearing control circuit, being applicable to one of an axial radial active magnetic bearing of control one magnetic bearing axially floats high, and magnetic bearing control circuit comprises: a handover module, a DC power supplier, an AC power supply module, one first sensing cell, one second sensing cell, a sensing module and a puocessing module.DC power supplier couples handover module.AC power supply module couples handover module.First sensing cell couples the elastic cable paper that handover module and connects magnetic bearing.Second sensing cell coupling cables line, and the second sensing cell is arranged in magnetic bearing.Sensing module couples AC power supply module and the first sensing cell.Puocessing module couples sensing module.Wherein, when magnetic bearing starts, on state is between handover module and DC power supplier, DC power supplier exports a VDC, and be supplied to the first sensing cell, elastic cable paper and the second sensing cell, and make sensing module detect a line resistance value of elastic cable paper and the second sensing cell, and be supplied to puocessing module, and puocessing module judges that line resistance value accords with a default scoping, puocessing module controls handover module and switches, to make to be on state between handover module and AC power supply module.
Further, this puocessing module is according to the VDC pressure drop of this elastic cable paper and this second sensing cell, to detect this line resistance value, this puocessing module is according to this line resistance value to calculate a driving shaft to compensation rate, and this driving shaft is the signal compensation amount of instruction because being lost in this elastic cable paper to compensation rate.
Further, judge that this line resistance value exceeds this default scoping in this puocessing module, and when being less than a default value, then this puocessing module is by output one first abnormal signal, and this first abnormal signal is the signal of bad connection between this magnetic bearing of instruction and a controller, or the length violation of this elastic cable paper is indicated to close the signal of measured lengths.
Further, when this puocessing module judges that this line resistance value exceeds this default value, this puocessing module is by output one second abnormal signal, and this second abnormal signal is be in the signal of open-circuit condition between this magnetic bearing of instruction and this controller, cannot the signal of output power state or indicate this controller to be in.
Further, this handover module has a first end, one second end and one the 3rd end, this first end couples this DC power supplier, this second end couples this AC power supply module, 3rd end couples this first sensing cell, and this puocessing module judges that this line resistance value does not meet in this default scoping, this puocessing module stops controlling this handover module and switches, and makes to be on state between this handover module and this DC power supplier to maintain.
Further, this DC power supplier comprises a DC electrical source and one first amplifier, this DC electrical source couples the first input end of this first amplifier, the output terminal of this first amplifier couples this first end of this handover module and the second input end of this first amplifier, this AC power supply module comprises an ac power supply, one second amplifier and a divider resistance, the first input end of this second amplifier of this AC power source, the output terminal of this second amplifier couples the second input end of this second end of this handover module, this divider resistance and this second amplifier.
Further, this divider resistance has one first contact, one second contact and one the 3rd contact, this first contact couples this second end of this handover module and the output terminal of this second amplifier, and this second contact couples this sensing module, and the 3rd contact couples a grounding end.
Further, when being on state between this handover module and this AC power supply module, this sensing module from the mid point of this first sensing cell and this second sensing cell to obtain a sensing signal, and from this second contact of this divider resistance to obtain a reference point signal, this sensing module is according to this sensing signal and this reference point signal, to export a displacement signal to this puocessing module, this puocessing module according to a driving shaft to compensation rate and this displacement signal, to control the exciting curent of an electromagnet of this axial radial active magnetic bearing.
Further, this divider resistance comprises one first resistance and one second resistance, and this first resistance is coupled to this first contact and this second contact, and this second resistance is coupled to this second contact and the 3rd contact.
Further, this sensing module comprises one the 3rd amplifier, a bandpass filtering unit and a synchronous detection unit, the first input end of the 3rd amplifier couples this second contact of this divider resistance, second input end of the 3rd amplifier couples this first sensing cell and this elastic cable paper, the output terminal of the 3rd amplifier couples one first channel and this bandpass filtering unit of this puocessing module, this synchronous detection unit couples a second channel of this bandpass filtering unit and this puocessing module, and an arithmetic element of this puocessing module couples this first channel and this second channel.
The embodiment of the present invention proposes a kind of magnetic suspension bearing system, comprising: a controller, an elastic cable paper and a magnetic bearing.Controller comprises a magnetic bearing control circuit.Elastic cable paper couples controller.Magnetic bearing coupling cables line.Magnetic bearing comprises an axial radial active magnetic bearing.Wherein, magnetic bearing control circuit is axially floating high to of radial active magnetic bearing in order to Control Shaft.
Further, this magnetic bearing more comprises: one first radial radial active magnetic bearing; One second radial radial active magnetic bearing; One rotating unit, is configured between this first radial radial active magnetic bearing and this second radial radial active magnetic bearing; One mandrel rod, this mandrel rod runs through this first radial radial active magnetic bearing, this second radial radial active magnetic bearing, this rotating unit and this axial radial active magnetic bearing; And multiple position transducer, those position transducers are respectively to should the first radial radial active magnetic bearing and this second radial radial active magnetic bearing and configure; Wherein, this axial radial active magnetic bearing, is configured at the bottom of this second radial radial active magnetic bearing.
Concrete means of the present invention are for utilizing magnetic bearing control circuit, when magnetic bearing is opened at every turn, sensing module can sense the VDC pressure drop of elastic cable paper and the second sensing cell, to make puocessing module calculate driving shaft to compensation rate, reach the object of free adjustment (TuningFree) whereby.Wherein, puocessing module according to driving shaft to compensation rate and displacement signal to control the exciting curent (i.e. magnetic force) of electromagnet, to support to be floated upper body in target location, reach whereby axis from accurate Control Shaft to radial active magnetic bearing float height.In addition, puocessing module is digital processor, can avoid the variable resistor because of analog circut and the capacitance variations of prior art whereby, and the situation of the instability produced.In addition, the present invention can promote the connection state judgment mechanism of magnetic bearing, improves the degree of intelligent product whereby.
Above general introduction and ensuing embodiment are all that right described embodiment and accompanying drawing only provide with reference to use is described, are not used for being limited the present invention in order to further illustrate technological means of the present invention and reach effect.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the magnetic bearing control circuit of one embodiment of the invention.
Fig. 2 A is the circuit diagram of the magnetic bearing control circuit of another embodiment of the present invention.
Fig. 2 B is the detailed circuit diagram of sensing module according to another embodiment of the present invention of Fig. 2 A and puocessing module.
Fig. 3 is the schematic diagram of the magnetic bearing of another embodiment of the present invention.
Wherein, description of reference numerals is as follows:
1: magnetic bearing control circuit
3: magnetic suspension bearing system
10: DC power supplier
12: AC power supply module
120: divider resistance
R1: the first resistance
R2: the second resistance
E21: the first contact
E22: the second contact
E23: the three contact
14: handover module
E1: first end
E2: the second end
E3: the three end
Z1: the first sensing cell
C: elastic cable paper
Z2: the second sensing cell
16: sensing module
160: the first paths
162: bandpass filtering unit
164: synchronous detection unit
18: puocessing module
181: first passage
182: second channel
184: arithmetic element
30: controller
32: magnetic bearing
320: axial radial active magnetic bearing
321: the first radial radial active magnetic bearings
322: the second radial radial active magnetic bearings
324: rotating unit
326: mandrel rod
328,330: position transducer
A1: the first amplifier
A2: the second amplifier
A3: the three amplifier
I11, I21, I31: first input end
I12, I22, I32: the second input end
O1, O2, O3: output terminal
S1: sensing signal
S2: reference point signal
P1: DC electrical source
P2: ac power supply
GND: grounding end
Embodiment
Fig. 1 is the functional block diagram of the magnetic bearing control circuit of one embodiment of the invention.Refer to Fig. 1.A kind of magnetic bearing control circuit 1, one of in order to control magnetic bearing one axial radial active magnetic bearing axially floats high, and magnetic bearing control circuit 1 comprises: DC power supplier 10, AC power supply module 12, handover module 14, a 1 first sensing cell Z1, an elastic cable paper C, one second sensing cell Z2, sensing module 16 and a puocessing module 18.In fact, DC power supplier 10 and AC power supply module 12 couple handover module 14 respectively.First sensing cell Z1 couples handover module 14, elastic cable paper C and sensing module 16.Second sensing cell Z2 coupling cables line C.Sensing module 16 couples AC power supply module 12 and puocessing module 18.
For example, when magnetic bearing starts at every turn, between handover module 14 and DC power supplier 10, on state will be in.So DC power supplier 10 will provide a VDC to magnetic bearing.Wherein, sensing module 16, according to the VDC pressure drop of the elastic cable paper C of fixed length and the second sensing cell Z2, to detect the line resistance value of elastic cable paper C and the second sensing cell Z2, and is supplied to puocessing module 18.And puocessing module 18 judges that line resistance value accords with a default scoping, then control handover module 14 switches by puocessing module 18, to make to be on state between handover module 14 and AC power supply module 12.Another puocessing module 18 according to line resistance value to calculate a driving shaft to compensation rate.Driving shaft is that instruction is because being lost in the signal compensation amount on elastic cable paper C to compensation rate.
Furthermore, if puocessing module 18 judges that line resistance value exceeds default scoping, and be less than a default value, then puocessing module 18 is by output one first abnormal signal.Wherein the first abnormal signal is such as the signal of bad connection between instruction magnetic bearing and controller, or the first abnormal signal is such as the signal of the length violation conjunction measured lengths of instruction elastic cable paper C.First and second abnormal signal another such as can pass through display device and/or loudspeaker, exports information warning and/or warning sound.The present embodiment does not limit the form of first and second abnormal signal.
If puocessing module 18 judges that line resistance value exceeds default value, then puocessing module 18 will export with one second abnormal signal.And the second abnormal signal is such as being in the signal of open-circuit condition between instruction magnetic bearing and controller, or the second abnormal signal such as indicating controller is in cannot the signal of output power state.
Specifically, DC power supplier 10 such as realizes through DC electrical source P1, and exports a VDC to magnetic bearing.And AC power supply module 12 such as realizes through ac power supply P2, and export an alternating voltage to magnetic bearing.The present embodiment does not limit the form of DC power supplier 10 and AC power supply module 12.In fact, the present embodiment first provides VDC to magnetic bearing with DC power supplier 10, when puocessing module 18 judges that line resistance value accords with default scoping, control handover module 14 is switched to AC power supply module 12 by puocessing module 18, provides alternating voltage to magnetic bearing to make AC power supply module 12.Wherein, puocessing module 18 will calculate driving shaft to compensation rate.Afterwards, puocessing module 18 is by floating high with the axis adjusting axial radial active magnetic bearing 320 to compensation rate according to driving shaft.
Handover module 14 is such as switch, diverter circuit or relay, in order to the link between conducting or cut-off DC power supplier 10 and magnetic bearing, or in order to the link between conducting or cut-off AC power supply module 12 and magnetic bearing.In fact, when puocessing module 18 judges that line resistance value accords with default scoping, puocessing module 18 will be in normal mode, switch to AC power supply module 12 to control handover module 14.When puocessing module 18 judges that line resistance value does not meet in default scoping, puocessing module 18 will be in abnormal patterns, can not control handover module 14 and switch to AC power supply module 12.In simple terms, handover module 14 is instruction according to puocessing module 18 and action.
Then, first or second sensing cell Z1, Z2 is such as inductive type shift sensor, also can conjugate and other mode sensing components of transforming impedance for corresponding to.The present embodiment does not limit the form of first and second sensing cell Z1, Z2.In fact, first and second sensing cell Z1, Z2 is such as the axis of the axial radial active magnetic bearing 320 corresponding to magnetic bearing floats high position transducer 328,330.Wherein the first sensing cell Z1 is such as arranged in controller, and the second sensing cell Z2 is such as arranged in magnetic bearing.And the axis of axial radial active magnetic bearing 320 float high such as Z axis axis by the floating upper position of floating upper body.Therefore, the magnetic bearing control circuit 1 of the present embodiment is for benchmark with the inductance value of the first sensing cell Z1, and magnetic bearing control circuit 1 is according to the inductance value of the first sensing cell Z1, to compare the inductance value of the second sensing cell Z2, and then calculate by the floating upper position of floating upper body.
Furthermore, axial radial active magnetic bearing comprises " making to be floated upper body and float the electromagnet of support with magnetic force " and " detecting by the second sensing cell Z2 of the floating upper position of floating upper body with inductance change ".Wherein, under puocessing module 18 is in normal mode, AC power supply module 12 provides alternating voltage to magnetic bearing.The signal that puocessing module 18 will export to compensation rate and sensing module 16 according to driving shaft, and the exciting curent (i.e. magnetic force) controlling electromagnet is to support to be floated upper body in target location.
Puocessing module 18 is such as the processor of central processing unit (CPU), microprocessor, digital processor or tool analog-to-digital function, and the present embodiment does not limit the form of puocessing module 18.In fact, puocessing module 18 in order to judge line resistance value, and manipulates in normal mode or abnormal patterns.In abnormal patterns, puocessing module 18 does not control handover module 14 and switches.In normal mode, puocessing module 18 controls handover module 14 and switches to AC power supply module 12, and puocessing module 18 controls the exciting curent (i.e. magnetic force) of electromagnet, to support to be floated upper body in target location.
For example, when magnetic bearing starts, on state is between DC power supplier 10 and handover module 14, DC power supplier 10 exports a VDC, and be supplied to the first sensing cell Z1, elastic cable paper C and the second sensing cell Z2, and make sensing module 16 detect a line resistance value of elastic cable paper C and the second sensing cell Z2, and be supplied to puocessing module 18, and puocessing module 18 judges that line resistance value accords with a default scoping, puocessing module 18 controls handover module 14 and switches, to make to be on state between AC power supply module 12 and handover module 14.
In addition, elastic cable paper C also exists electrostatic capacity, wherein electrostatic capacity can change to some extent along with the length of elastic cable paper C, or the contact of elastic cable paper C increases the resistance value of elastic cable paper C because of oxidation, or elastic cable paper C increases the resistance value of elastic cable paper C because cold welding or connector are not locked, or the length violation of elastic cable paper C closes measured lengths and increases or reduce resistance value, or change to some extent because being in open-circuit condition between magnetic bearing and controller, or because of controller is in cannot output power state and changing to some extent.The magnetic bearing control circuit 1 of the present embodiment can pass through DC power supplier 10 to export VDC to magnetic bearing, and detect line resistance value by sensing module 16, and puocessing module 18 according to line resistance value to judge whether to enter normal mode or abnormal patterns.
In addition, prior art changes to some extent because of the length of elastic cable paper C, and there is the problem that cannot correctly detect by the floating upper position of floating upper body.The magnetic bearing control circuit 1 of the present embodiment can pass through line resistance value to calculate driving shaft to compensation rate.Therefore, the signal that puocessing module 18 exports to compensation rate and sensing module 16 according to driving shaft, and control the exciting curent (i.e. magnetic force) of electromagnet, to support to be floated upper body in target location, reach accurate Control Shaft whereby floating high to the axis of radial active magnetic bearing.
Fig. 2 A is the circuit diagram of the magnetic bearing control circuit of another embodiment of the present invention.Fig. 2 B is the detailed circuit diagram of sensing module 16 according to another embodiment of the present invention of Fig. 2 A and puocessing module 18.Refer to Fig. 2 A and 2B.
Specifically, handover module 14 has a first end E1, one second end E2 and the 3rd end E3.Wherein first end E1 couples DC power supplier 10, and the second end E2 couples AC power supply module 12, and the 3rd end E3 couples the first sensing cell Z1.In simple terms, when magnetic bearing starts, the first end E1 of handover module 14 is connected to DC power supplier 10.Afterwards, under puocessing module 18 is in normal mode, puocessing module 18 controls handover module 14 to switch, and is connected to AC power supply module 12 to make the second end E2 of handover module 14.The present embodiment does not limit the form of handover module 14.
DC power supplier 10 comprises a DC electrical source P1 and one first amplifier A1, DC electrical source P1 couples a first input end I11 of the first amplifier A1, and the output terminal O1 of the first amplifier A1 couples the first end E1 of the handover module 14 and one second input end I12 of the first amplifier A1.Wherein first input end I11 is such as non-inverting input, and the second end E2 is such as inverting input, and this example does not limit the form of DC power supplier 10.
AC power supply module 12 comprises an ac power supply P2, one second amplifier A2 and a divider resistance 120, ac power supply P2 couples a first input end I21 of the second amplifier A2, and the output terminal O2 of the second amplifier A2 couples the second end E2 of handover module 14, the one second input end I22 of the second amplifier A2 and divider resistance 120.The form of this example not limiting AC power module 12.Another first and second amplifier A1, A2 are such as anti-phase closed loop amplifier or subtractor, and the present embodiment does not limit the form of first and second amplifier A1, A2.
Divider resistance 120 has one first contact E21, one second contact E22 and the 3rd contact E23, first contact E21 couples the second end E2 of the handover module 14 and output terminal O2 of the second amplifier A2, second contact E22 couples sensing module 16, and the 3rd contact E23 couples a grounding end.In fact, divider resistance 120 comprises one first resistance R1 and one second resistance R2, and the first resistance R1 is coupled to the first contact E21 and the second contact E22, and the second resistance R2 is coupled to the second contact E22 and the 3rd contact E23.For convenience of description, the resistance value of the first resistance R1 of the present embodiment is equal to the resistance value of the second resistance R2.In other embodiments, the resistance value of the first resistance R1 can be greater than or less than the resistance value of the second resistance R2, and art those of ordinary skill can freely design divider resistance 120.
Refer to Fig. 2 B, sensing module 16 comprises one the 3rd amplifier A3, bandpass filtering unit 162 and a synchronous detection unit 164, the first input end I31 of the 3rd amplifier A3 couples the second contact E22 of divider resistance 120, the second input end I32 of the 3rd amplifier A3 couples the first sensing cell Z1 and elastic cable paper C, the output terminal O3 of the 3rd amplifier A3 couples a first passage 181 and the bandpass filtering unit 162 of puocessing module 18, and a second channel 182 of synchronous detection unit 164 coupled belt pass filtering unit 162 and puocessing module 18.
Furthermore, when DC power supplier 10 provides VDC to magnetic bearing, the second end E2 of handover module 14 and the 3rd end E3 is cut-off state, and the first end E1 of handover module 14 and the 3rd end E3 is on state.So the second input end I32 by the 3rd amplifier A3 enters by sensing signal S1, and by the 3rd amplifier A3 output terminal O3 export and via first channel 181 of the first path 160 to puocessing module 18.Wherein sensing signal S1 is such as the voltage signal of the displacement point of the mid point of first and second sensing cell of instruction sensing Z1, Z2.The present embodiment does not limit the form of sensing signal S1.
Then, when AC power supply module 12 provides VDC to magnetic bearing, first end E1 and the 3rd end E3 of handover module 14 are cut-off state, and the second end E2 of handover module 14 and the 3rd end E3 is on state.So the first input end I31 by the 3rd amplifier A3 enters by reference point signal S2, and the second input end I32 by the 3rd amplifier A3 enters by sensing signal S1.Wherein reference point signal S2 is such as the voltage signal of the second contact E22 of instruction divider resistance 120.Compared by reference point signal S2 and sensing signal S1 via the 3rd amplifier A3 and amplify, and exporting a displacement signal to bandpass filtering unit 162 from output terminal O3.
Afterwards, bandpass filtering unit 162 (BPF, band-passfilter) such as by alternating signal, then bandpass filtering unit 162 by logical for output band and filtered displacement signal to synchronous detection unit 164.The second channel 182 of displacement signal to puocessing module 18 is exported again through synchronous detection unit 164 detection.Certainly, puocessing module 18 to control the exciting curent (i.e. magnetic force) of electromagnet, to support to be floated upper body in target location, reaches accurate Control Shaft floating high to the axis of radial active magnetic bearing according to displacement signal whereby.
Puocessing module 18 comprises first passage 181, second channel 182 and an arithmetic element 184.First passage 181 couples output terminal O3 and the arithmetic element 184 of the 3rd amplifier A3, and second channel 182 couples synchronous detection unit 164 and arithmetic element 184.In fact, first and second passage 181,182 is such as respectively the channel of analog-to-digital, in order to the sensing signal S1 of simulation is converted to the first digital signal, and the displacement signal of simulation is converted to the second digital signal, and is transferred to arithmetic element 184.
Wherein, arithmetic element 184 is such as arithmetic processor.Arithmetic element 184 according to the first digital signal to calculate driving shaft to compensation rate.And arithmetic element 184 according to driving shaft to compensation rate and the second digital signal, to control the exciting curent (i.e. magnetic force) of electromagnet, to support to be floated upper body in target location.The present embodiment does not limit the form of magnetic bearing control circuit 1.
Fig. 3 is the schematic diagram of the magnetic bearing of another embodiment of the present invention.Refer to Fig. 3.A kind of magnetic suspension bearing system 3, comprises controller 30, elastic cable paper C and a magnetic bearing 32.In fact, elastic cable paper C couples between controller 30 and magnetic bearing 32, controller 30 in order to out-put supply to magnetic bearing 32.Its middle controller 30 such as comprises a magnetic bearing control circuit (not shown) of Fig. 1.Wherein DC power supplier 10, AC power supply module 12, handover module 14, a 1 first sensing cell Z1 of magnetic bearing control circuit 1, a sensing module 16 and a puocessing module 18 are such as arranged in controller 30, and the second sensing cell Z2 of magnetic bearing control circuit 1 is such as arranged in magnetic bearing 32.And the puocessing module 18 of magnetic bearing control circuit can, according to driving shaft to compensation rate and displacement signal, be floated high with the axis of control magnetic bearing 32 one axial radial active magnetic bearing 320.The present embodiment does not limit the form of magnetic suspension bearing system 3.
Specifically, magnetic bearing 32 comprises one first radial radial active magnetic bearing 321,1 second radial radial active magnetic bearing 322, rotating unit 324, axial radial active magnetic bearing 320, mandrel rod 326, magnetic bearing control circuit 1 and multiple position transducer 328,330.Wherein, rotating unit 324 is configured between the first radial radial active magnetic bearing 321 and the second radial radial active magnetic bearing 322.Axial radial active magnetic bearing 320 is configured at the bottom of the second radial radial active magnetic bearing 322.And mandrel rod 326 runs through the radial radial active magnetic bearing 322 of the first radial radial active magnetic bearing 321, second, rotating unit 324 and axial radial active magnetic bearing 320.
Wherein, the first radial radial active magnetic bearing 321 and the second radial radial active magnetic bearing 322 are such as respectively active for running shaft the active magnetic bearing of radial direction being controlled in the floating upper position of radial direction.In simple terms, the first radial radial active magnetic bearing 321 and the second radial radial active magnetic bearing 322 are such as respectively the magnetic bearing of X-axis and Y-axis axis.The present embodiment does not limit the form of the first radial radial active magnetic bearing 321 and the second radial radial active magnetic bearing 322.
In addition, the second sensing cell Z2 is such as the axis of axial radial active magnetic bearing 320 floats high inductive type shift sensor.And the first sensing cell Z1 corresponds to the second sensing cell Z2 and is disposed in controller 30.These position transducers 328,330 another corresponding first radial radial active magnetic bearing 321 and the second radial radial active magnetic bearing 322 and be configured in magnetic bearing 32 respectively.Then, rotating unit 324 is such as motor or rotor, and the present embodiment does not limit the form of rotating unit 324.Certainly, the magnetic suspension bearing system 3 of the present embodiment can control the floating height of axis of an axial radial active magnetic bearing 320 of magnetic bearing 32 accurately.
In sum, the present invention is a kind of magnetic bearing control circuit, when magnetic bearing is started shooting at every turn, DC power supplier first provides VDC to magnetic bearing, and sensing module can sense the line resistance value of elastic cable paper and the second sensing cell, and judge whether line resistance value meets default scoping by puocessing module.If the determination result is YES, then puocessing module controls handover module and switches to AC power supply module.Afterwards, there is provided alternating voltage to magnetic bearing by AC power supply module, sensing module can sense the sensing signal of the displacement point of first and second sensing cell, and the reference point signal of the second contact of sensing divider resistance, and exports a displacement signal to puocessing module.Again by puocessing module according to driving shaft to compensation rate and displacement signal to control the exciting curent (i.e. magnetic force) of electromagnet, to support to be floated upper body in target location, reach whereby axis from accurate Control Shaft to radial active magnetic bearing float height.In addition, puocessing module is digital processor, can avoid the variable resistor because of analog circut and the capacitance variations of prior art whereby, and the situation of the instability produced.In addition, the present invention can save and filter Alternating Component circuit, saves cost whereby and improves stability.The present invention can promote the connection state judgment mechanism of magnetic bearing, improves the degree of intelligent product whereby.
The foregoing is only embodiments of the invention, it is also not used to limit to the scope of the claims of the present invention.
Claims (12)
1. a magnetic bearing control circuit, be applicable to one of an axial radial active magnetic bearing of control one magnetic bearing and axially float high, it is characterized in that, this magnetic bearing control circuit comprises:
One handover module;
One DC power supplier, couples this handover module;
One AC power supply module, couples this handover module;
One first sensing cell, couples the elastic cable paper that this handover module and connects this magnetic bearing;
One second sensing cell, couples this elastic cable paper, and this second sensing cell is arranged in this magnetic bearing;
One sensing module, couples this AC power supply module and this first sensing cell; And
One puocessing module, couples this sensing module;
Wherein, when this magnetic bearing starts, on state is between this handover module and this DC power supplier, this DC power supplier exports a VDC, and be supplied to this first sensing cell, this elastic cable paper and this second sensing cell, and make this sensing module detect a line resistance value of this elastic cable paper and this second sensing cell, and be supplied to this puocessing module, and this puocessing module judges that this line resistance value accords with a default scoping, this puocessing module controls this handover module and switches, to make to be on state between this handover module and this AC power supply module.
2. magnetic bearing control circuit as claimed in claim 1, it is characterized in that, this puocessing module is according to the VDC pressure drop of this elastic cable paper and this second sensing cell, to detect this line resistance value, this puocessing module is according to this line resistance value to calculate a driving shaft to compensation rate, and this driving shaft is the signal compensation amount of instruction because being lost in this elastic cable paper to compensation rate.
3. magnetic bearing control circuit as claimed in claim 1, it is characterized in that, judge that this line resistance value exceeds this default scoping in this puocessing module, and when being less than a default value, then this puocessing module is by output one first abnormal signal, and this first abnormal signal is the signal of bad connection between this magnetic bearing of instruction and a controller, or the length violation of this elastic cable paper is indicated to close the signal of measured lengths.
4. magnetic bearing control circuit as claimed in claim 3, it is characterized in that, when this puocessing module judges that this line resistance value exceeds this default value, this puocessing module is by output one second abnormal signal, and this second abnormal signal is be in the signal of open-circuit condition between this magnetic bearing of instruction and this controller, cannot the signal of output power state or indicate this controller to be in.
5. magnetic bearing control circuit as claimed in claim 1, it is characterized in that, this handover module has a first end, one second end and one the 3rd end, this first end couples this DC power supplier, this second end couples this AC power supply module, 3rd end couples this first sensing cell, and this puocessing module judges that this line resistance value does not meet in this default scoping, this puocessing module stops controlling this handover module and switches, and makes to be on state between this handover module and this DC power supplier to maintain.
6. magnetic bearing control circuit as claimed in claim 5, it is characterized in that, this DC power supplier comprises a DC electrical source and one first amplifier, this DC electrical source couples the first input end of this first amplifier, the output terminal of this first amplifier couples this first end of this handover module and the second input end of this first amplifier, this AC power supply module comprises an ac power supply, one second amplifier and a divider resistance, the first input end of this second amplifier of this AC power source, the output terminal of this second amplifier couples this second end of this handover module, second input end of this divider resistance and this second amplifier.
7. magnetic bearing control circuit as claimed in claim 6, it is characterized in that, this divider resistance has one first contact, one second contact and one the 3rd contact, this first contact couples this second end of this handover module and the output terminal of this second amplifier, this second contact couples this sensing module, and the 3rd contact couples a grounding end.
8. magnetic bearing control circuit as claimed in claim 7, it is characterized in that, when being on state between this handover module and this AC power supply module, this sensing module from the mid point of this first sensing cell and this second sensing cell to obtain a sensing signal, and from this second contact of this divider resistance to obtain a reference point signal, this sensing module is according to this sensing signal and this reference point signal, to export a displacement signal to this puocessing module, this puocessing module according to a driving shaft to compensation rate and this displacement signal, to control the exciting curent of an electromagnet of this axial radial active magnetic bearing.
9. magnetic bearing control circuit as claimed in claim 7, it is characterized in that, this divider resistance comprises one first resistance and one second resistance, and this first resistance is coupled to this first contact and this second contact, and this second resistance is coupled to this second contact and the 3rd contact.
10. magnetic bearing control circuit as claimed in claim 7, it is characterized in that, this sensing module comprises one the 3rd amplifier, one bandpass filtering unit and a synchronous detection unit, the first input end of the 3rd amplifier couples this second contact of this divider resistance, second input end of the 3rd amplifier couples this first sensing cell and this elastic cable paper, the output terminal of the 3rd amplifier couples one first channel and this bandpass filtering unit of this puocessing module, this synchronous detection unit couples a second channel of this bandpass filtering unit and this puocessing module, one arithmetic element of this puocessing module couples this first channel and this second channel.
11. 1 kinds of magnetic suspension bearing systems, is characterized in that, this magnetic suspension bearing system comprises:
One controller, comprises a magnetic bearing control circuit as claimed in claim 1;
One elastic cable paper, couples this controller;
One magnetic bearing, couples this elastic cable paper, and this magnetic bearing comprises an axial radial active magnetic bearing; And wherein, this magnetic bearing control circuit is axially floating high in order to control this axial radial active magnetic bearing one.
12. magnetic suspension bearing systems as claimed in claim 11, it is characterized in that, this magnetic bearing more comprises:
One first radial radial active magnetic bearing;
One second radial radial active magnetic bearing;
One rotating unit, is configured between this first radial radial active magnetic bearing and this second radial radial active magnetic bearing;
One mandrel rod, this mandrel rod runs through this first radial radial active magnetic bearing, this second radial radial active magnetic bearing, this rotating unit and this axial radial active magnetic bearing; And
Multiple position transducer, those position transducers are respectively to should the first radial radial active magnetic bearing and this second radial radial active magnetic bearing and configure;
Wherein, this axial radial active magnetic bearing, is configured at the bottom of this second radial radial active magnetic bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410287386.9A CN105317837B (en) | 2014-06-24 | 2014-06-24 | Magnetic suspension bearing system and its control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410287386.9A CN105317837B (en) | 2014-06-24 | 2014-06-24 | Magnetic suspension bearing system and its control circuit |
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| CN105317837A true CN105317837A (en) | 2016-02-10 |
| CN105317837B CN105317837B (en) | 2017-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410287386.9A Active CN105317837B (en) | 2014-06-24 | 2014-06-24 | Magnetic suspension bearing system and its control circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066493A (en) * | 1991-05-04 | 1992-11-25 | 莱鲍尔德股份公司 | Start the circuit of method and this method of realization of the machine that the magnetic bearing rotor is housed |
| CN202550933U (en) * | 2012-05-12 | 2012-11-21 | 济南大学 | Magnetic suspension system based on force control using quasi suspension motor and axial magnetic bearing |
| CN103174746A (en) * | 2013-03-28 | 2013-06-26 | 南京工业大学 | Active magnetic bearing system and control circuit |
| KR101289159B1 (en) * | 2011-06-28 | 2013-07-23 | 주식회사 포스코 | Apparatus for protecting magnetic bearing and apparatus for motor having the same |
| JP2013148140A (en) * | 2012-01-18 | 2013-08-01 | Shimadzu Corp | Magnetic bearing control device |
-
2014
- 2014-06-24 CN CN201410287386.9A patent/CN105317837B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066493A (en) * | 1991-05-04 | 1992-11-25 | 莱鲍尔德股份公司 | Start the circuit of method and this method of realization of the machine that the magnetic bearing rotor is housed |
| KR101289159B1 (en) * | 2011-06-28 | 2013-07-23 | 주식회사 포스코 | Apparatus for protecting magnetic bearing and apparatus for motor having the same |
| JP2013148140A (en) * | 2012-01-18 | 2013-08-01 | Shimadzu Corp | Magnetic bearing control device |
| CN202550933U (en) * | 2012-05-12 | 2012-11-21 | 济南大学 | Magnetic suspension system based on force control using quasi suspension motor and axial magnetic bearing |
| CN103174746A (en) * | 2013-03-28 | 2013-06-26 | 南京工业大学 | Active magnetic bearing system and control circuit |
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|---|---|
| CN105317837B (en) | 2017-10-10 |
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