CN102829709B - Radial magnetic bearing electrical vortex sensor integrated structure for magnetic levitation high-speed electric machine - Google Patents
Radial magnetic bearing electrical vortex sensor integrated structure for magnetic levitation high-speed electric machine Download PDFInfo
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- CN102829709B CN102829709B CN201210272067.1A CN201210272067A CN102829709B CN 102829709 B CN102829709 B CN 102829709B CN 201210272067 A CN201210272067 A CN 201210272067A CN 102829709 B CN102829709 B CN 102829709B
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Abstract
The invention provides a radial magnetic bearing electrical vortex sensor integrated structure for a magnetic levitation high-speed electric machine, consisting of four radial displacement sensor probes for detecting radial displacement signals, a permanent magnet biased hybrid magnetic bearing controlling the levitation of a rotor and an external sensor signal processing circuit, wherein the sensor probes are integrated in the permanent magnet biased hybrid magnetic bearing, and sensor probe preamplifier circuits are integrated together to be put in a control box of a magnetic levitation electric machine to be separated from the sensor probes. According to the radial magnetic bearing electrical vortex sensor, the space of the magnetic levitation electric machine can be greatly saved, the work efficiency of the magnetic levitation electric machine can be improved, the influence of the temperature drift to the sensor can be reduced, the stability of the magnetic levitation electric machine can be improved, the applicable place of the magnetic levitation electric machine can be enlarged, and the whole performance of the magnetic levitation electric machine can be prominently improved.
Description
Technical field
The present invention relates to a kind of non-contact eddy current sensor, particularly, for the integrated current vortex sensor of magnetic suspension high speed motor and magnetic bearing, can be used as fan blower, compressor and vacuum pump etc. has the non-contact displacement sensor of strict demand to aspects such as the volume of system, weight and precision.
Background technology
Magnetic bearing has machinery-free friction and wear, do not need lubricated and safeguards, allows rotor high-speed rotation, life-span length, high reliability, therefore in many fields such as air compressor, molecular pump, aerogenerator, hydrogenerator, accumulated energy flywheels, obtained application, and application is still in continuous expansion.The use of magnetic bearing needs the cooperation of sensor to reach the object of stable suspersion conventionally, in magnetic suspension high speed motor, need to survey the displacement signal of five degree of freedom, existing structure is used current vortex sensor, each degree of freedom needs a non-contact displacement sensor, for improving the precision of sensor, conventionally take difference structure, at this moment each magnetic suspension system just needs a plurality of current vortex sensors, this pattern of taking sensor and magnetic bearing separate design, can greatly increase the length of rotor, under high-speed rotation state, be easy to cause the flexural vibrations of rotor, be unfavorable for the stable operation of magnetic suspension motor, reduced the maximum operation frequency of magnetic levitaion motor, in addition, existing current vortex sensor is integrated in motor internal together by preamplifier circuit and sensor probe mostly, and the performance that forms the electronic devices and components such as amplifier, resistance, electric capacity and diode of amplifying circuit is very easily subject to the impact of temperature, and in the environment of certain vibration or humidity, be very easy to burn, the fragility of this amplifying circuit makes motor be difficult to be operated under the rugged surroundings such as strong vibration, humidity.Therefore, existing current vortex sensor structure is not compact, and environmental suitability is poor, thereby has greatly limited magnetic suspension motor, environment for use and the frequency of operation of the magnetic levitation rotating mechanisms such as magnetic suspension compressor.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, radial direction magnetic bearing current vortex sensor integral structure for a kind of magnetic suspension high speed motor is provided, significantly reduced current vortex sensor and and the rotor length of system, the adaptive capacity to environment of sensor of greatly having improved, and then expanded the use occasion of magnetic suspension motor, improved magnetic suspension motor performance.
Technical solution of the present invention is: radial direction magnetic bearing current vortex sensor integral structure for magnetic suspension high speed motor, by four paths of surveying radial displacement signal, to displacement sensor probe, the permanent magnet biased hybrid magnetic bearing of controlling rotor suspension and external sensor signal processing circuit, formed, sensor probe is integrated in permanent magnet biased hybrid magnetic bearing, sensor probe preamplifier circuit integrates in the control box that is placed on magnetic suspension motor, separated with sensor probe.Wherein permanent magnet biased hybrid magnetic bearing is comprised of magnetic pole (A1～A8), magnetizing coil (D1～D8) and discrete permanent magnet; The magnetic pole of permanent magnet biased hybrid magnetic bearing is double-decker, 4 stator cores of 90 ° of being separated by same circumference form 4 magnetic pole of the stator (A1～A4), along X, the positive and negative four direction of Y-axis, place respectively, same form is placed 4 stator cores and is formed other 4 magnetic pole of the stator (A5～A8), totally two groups of double-deck 8 magnetic pole of the stator structures of axial horizontal positioned that stator core forms magnetic bearing.Magnetic pole A1～A4 90 °, interval placement on circumference in XY plane, wherein magnetic pole A1 is placed on X-axis positive dirction, and magnetic pole A2 is placed on Y-axis negative direction, and magnetic pole A3 is placed on X-axis negative direction, and magnetic pole A4 is placed on Y-axis positive dirction; For magnetic pole A5～A8 same 90 °, interval placement on the circumference that is parallel to XY plane, wherein magnetic pole A5 is placed on X-axis positive dirction, and magnetic pole A6 is placed on Y-axis negative direction, and magnetic pole A7 is placed on X-axis negative direction, and magnetic pole A8 is placed on Y-axis positive dirction.Magnetic pole A1 and magnetic pole A5, magnetic pole A2 and magnetic pole A6, magnetic pole A3 and magnetic pole A7, magnetic pole A4 and magnetic pole A8 parallel placement respectively, magnetic pole A1 and magnetic pole A5 control X+ direction and suspend, magnetic pole A2 and magnetic pole A6 control Y-direction and suspend, magnetic pole A3 and magnetic pole A7 control X-direction and suspend, magnetic pole A4 and magnetic pole A8 control Y+ direction and suspend, and each magnetic pole of the stator is wound with magnetizing coil (D1～D8).
The annulus being formed by discrete permanent magnet and sensor holder between the magnetic bearing two groups of stator cores in left and right, totally 4 of the discrete permanent magnets that magnetic suspension high speed motor adopts with radial integrated magnetic bearing current vortex sensor, along X, positive and negative 4 directions of Y-axis, be placed on annulus, between discrete permanent magnet, with aluminum sensor holder, separate, probe (T1～T4) is installed on sensor holder.
The center T1o of sensor probe T1 is equal to the distance of magnetic pole (A1, A4, A5, A8) center A1o, A4o, A5o, A8o, and the cornerwise mid point of rectangle plane that probe axis and A1o, A4o, A5o, tetra-points of A8o form intersects; Sensor probe T2 can be placed on adjacent 4 magnetic pole A1, A2, A5, A6 axially between arbitrary position, but for reducing the impact of magnetic bearing magnetic field on sensor probe, preferred version is that the center T2o of probe T2 is equal to the distance of magnetic pole (A1, A2, A5, A6) center A1o, A2o, A5o, A6o, and the cornerwise mid point of rectangle plane that probe axis and A1o, A2o, A5o, tetra-points of A6o form intersects; Sensor probe T3 can be placed on adjacent 4 magnetic pole A2, A3, A6, A7 axially between arbitrary position, but for reducing the impact of magnetic bearing magnetic field on sensor probe, preferred version is that the center T3o of probe T3 is equal to the distance of magnetic pole (A2, A3, A6, A7) center A2o, A3o, A6o, A7o, and the cornerwise mid point of rectangle plane that probe axis and A2o, A3o, A6o, tetra-points of A7o form intersects; Sensor probe T4 can be placed on adjacent 4 magnetic pole A3, A4, A7, A8 axially between arbitrary position, but for reducing the impact of magnetic bearing magnetic field on sensor probe, preferred version is that the center T4o of probe T4 is equal to the distance of magnetic pole (A3, A4, A7, A8) center A3o, A4o, A7o, A8o, and the cornerwise mid point of rectangle plane that probe axis and A3o, A4o, A7o, tetra-points of A8o form intersects.Two relative sensor probe (T1, T3) the difference output probe that partners, with X-axis angle be 45 °, another two relative sensor probe (T2, T4) form another to difference output probe, with X-axis angle be-45 °, two displacement signals of every pair of probe output become a road differential output signal after external treatment circuit, survey the motion of magnetic suspension motor rotor, test surface is circle.
The present invention's advantage is compared with prior art: eddy current displacement sensor of the present invention and magnetic bearing, the sensor probe of surveying radial displacement signal is all concentrated on to a magnetic bearing sensor assembly with the magnetic bearing of controlling radial displacement, greatly saved the space of magnetic suspension motor, improved the frequency of operation of magnetic suspension motor, reduced the impact of temperature drift on sensor, improved the stability of magnetic suspension motor, expanded the applicable situation of magnetic suspension motor, the Integral lifting of magnetic suspension motor performance has been had to the effect of highly significant.
Accompanying drawing explanation
Fig. 1 is that magnetic suspension high speed motor is front view with radial integrated magnetic bearing current vortex sensor structural representation Fig. 1 a; Fig. 1 b is rear view; Fig. 1 c is A-A view; Fig. 1 d is B-B view; Fig. 1 e is C-C view; Fig. 1 f is D-D view;
Fig. 2 is 3-D effect schematic diagram of the present invention and explosive view;
Fig. 3 is the structural front view that band of the present invention is surveyed body;
Fig. 4 is the composition schematic diagram of each prime amplifier of the present invention;
Fig. 5 is the compensating circuit schematic diagram of every pair of prime amplifier difference structure of the present invention.
Embodiment
Magnetic suspension high speed motor is comprised of 4 road displacement sensor probes, permanent magnet biased hybrid magnetic bearing and external sensor signal processing circuit with radial direction magnetic bearing current vortex sensor integral structure, and whole magnetic bearing sensor integral component is for surveying embedding structure.As depicted in figs. 1 and 2, permanent magnet biased hybrid magnetic bearing is comprised of magnetic pole (A1～A8), magnetizing coil (D1～D8) and discrete permanent magnet 9.The magnetic pole of permanent magnet biased hybrid magnetic bearing is double-decker, 4 stator cores of 90 ° of being separated by same circumference form 4 magnetic pole of the stator (A1～A4), along X, the positive and negative four direction of Y-axis, place respectively, same form is placed 4 stator cores and is formed other 4 magnetic pole of the stator (A5～A8), totally two groups of stator cores form the double-deck 8 magnetic pole of the stator structures of axial horizontal positioned of magnetic bearings, two adjacent stator cores of left and right are one group, form respectively the magnetic pole of X, the positive and negative four direction of Y-axis.As shown in Fig. 1 a and Fig. 1 b, magnetic pole A1～A4 90 °, interval placement on circumference in XY plane, wherein magnetic pole A1 is placed on X-axis positive dirction, and magnetic pole A2 is placed on Y-axis negative direction, and magnetic pole A3 is placed on X-axis negative direction, magnetic pole A4 is placed on Y-axis positive dirction, for magnetic pole A5～A8 same 90 °, interval placement on the circumference that is parallel to XY plane, wherein magnetic pole A5 is placed on X-axis positive dirction, and magnetic pole A6 is placed on Y-axis negative direction, magnetic pole A7 is placed on X-axis negative direction, and magnetic pole A8 is placed on Y-axis positive dirction.Magnetic pole A1 and magnetic pole A5, magnetic pole A2 and magnetic pole A6, magnetic pole A3 and magnetic pole A7, magnetic pole A4 and magnetic pole A8 parallel placement respectively, magnetic pole A1 and magnetic pole A5 control X+ direction and suspend, magnetic pole A2 and magnetic pole A6 control Y-direction and suspend, magnetic pole A3 and magnetic pole A7 control X-direction and suspend, magnetic pole A4 and magnetic pole A8 control Y+ direction and suspend, and each magnetic pole of the stator is wound with magnetizing coil (D1～D8).
The annulus being formed by discrete permanent magnet and sensor holder between the magnetic bearing two groups of stator cores in left and right as shown in Figure 2, totally 4 of the discrete permanent magnets 9 that magnetic suspension high speed motor adopts with radial integrated magnetic bearing current vortex sensor, along X, positive and negative 4 directions of Y-axis, be placed on annulus, between discrete permanent magnet, with aluminum sensor holder 10, separate, probe (T1～T4) is installed on sensor holder.Sensor probe is fixed on sensor holder by colloid.
The center T1o of sensor probe T1 equates to the distance of magnetic pole (A1, A4, A5, A8) center A1o, A4o, A5o, A8o, is that the cornerwise mid point of rectangle plane that formed of probe axis and A1o, A4o, A5o, tetra-points of A8o is crossing as shown in Fig. 1 c; The center T2o of sensor probe T2 equates to the distance of magnetic pole (A1, A2, A5, A6) center A1o, A2o, A5o, A6o, is that the cornerwise mid point of rectangle plane that forms of probe axis and A1o, A2o, A5o, tetra-points of A6o is crossing as shown in Figure 1 d; The center T3o of sensor probe T3 equates to the distance of magnetic pole (A2, A3, A6, A7) center A2o, A3o, A6o, A7o, is that the cornerwise mid point of rectangle plane that formed of probe axis and A2o, A3o, A6o, tetra-points of A7o is crossing as shown in Fig. 1 e; The center T4o of sensor probe T4 equates to the distance of magnetic pole (A3, A4, A7, A8) center A3o, A4o, A7o, A8o, is that the cornerwise mid point of rectangle plane that forms of probe axis and A3o, A4o, A7o, tetra-points of A8o is crossing as shown in Figure 1 f.Relative two radial displacement transducers probe (T1 as shown in Figure 1a when practical application, T3) partner differential output probe, differential output is expressed as u1, with X-axis angle be 45 °, another two relative radial displacement transducers probes (T2, T4) form another differential output are popped one's head in, differential output is expressed as u3, with X-axis angle be-45 °, in subsequent treatment, u1 and u3 are carried out to coordinate conversion, make displacement detecting result and magnetic bearing process direction consistent.
As shown in Figure 3, between magnetic pole (A1～A8) and rotor R, form magnetic gap, between sensor probe (T1～T4) and rotor R, form and survey gap, magnetic gap m1 is generally 0.4mm～0.5mm, surveys gap m2 and is generally all mutually 0.2mm～1.25mm with magnetic gap.
As shown in Figure 4, the prime amplifier of probe T1～T4 is mainly comprised of crystal oscillator, AGC network, sensor probe coil resonance circuit, position pressure detecting circuit, filtering adjustment and power amplifier output circuit.Crystal oscillator joins through the input end of AGC network and sensor probe coil resonance circuit, for sensor probe coil resonance circuit being provided to the pumping signal of a frequency stabilization, fixed ampllitude, sensor probe coil resonance electric circuit inspection to displacement signal after multiplication of voltage detection, filtering adjustment and power amplifier are processed, export to subsequent control system and use.
As shown in Figure 5, between displacement sensor probe T1 of the present invention and the prime amplifier of T3, form difference structure, adopt identical and symmetrical circuit structure.Crystal oscillator is after AGC network, join with the input end of probe T1 and probe T3 two-way sensor probe coil resonance circuit simultaneously, difference output after identical multiplication of voltage detection and filtering Circuit tuning, the T1 that wherein pops one's head in is identical with the coil resonance circuit of probe T3.Difference structure makes the temperature in two loops float to float as common-mode signal and suppress mutually in time, thereby has improved temperature and the time stability of sensor.In like manner, probe T2 and probe T4 also adopt identical structure.
Between detection body in the present invention and the hot-wire coil in sensor probe, by eddy current mutual inductance effect, carrying out distance detects, the material of surveying body directly affects the performances such as the sensitivity of sensor, precision, the material of surveying body in principle can be all electrically conductive materials, but for improving the stability of sensor, it is surveyed body material and is up to and not only conducts electricity but also the material of magnetic conduction, as 45
#steel or 40Cr etc.
Claims (1)
1. radial direction magnetic bearing current vortex sensor integral structure for magnetic suspension high speed motor, it is characterized in that: by four paths of surveying radial displacement signal, to displacement sensor probe, the permanent magnet biased hybrid magnetic bearing of controlling rotor suspension and external sensor signal processing circuit, formed, sensor probe is integrated in permanent magnet biased hybrid magnetic bearing, sensor probe preamplifier circuit integrates in the control box that is placed on magnetic suspension motor, separated with sensor probe, wherein permanent magnet biased hybrid magnetic bearing is comprised of magnetic pole (A1～A8), magnetizing coil (D1～D8) and discrete permanent magnet (9), the magnetic pole of permanent magnet biased hybrid magnetic bearing is double-decker, 4 stator cores of 90 ° of being separated by same circumference form 4 magnetic pole of the stator (A1～A4), respectively along X, the positive and negative four direction of Y-axis is placed, same form is placed 4 stator cores and is formed other 4 magnetic pole of the stator (A5～A8), totally two groups of stator cores form the double-deck 8 magnetic pole of the stator structures of axial horizontal positioned of magnetic bearings, wherein magnetic pole A1 and magnetic pole A5 control the suspension of X+ direction, magnetic pole A2 and magnetic pole A6 control Y-direction and suspend, magnetic pole A3 and magnetic pole A7 control X-direction and suspend, magnetic pole A4 and magnetic pole A8 control Y+ direction and suspend, on each magnetic pole of the stator, be wound with magnetizing coil, the annulus being formed by discrete permanent magnet (9) and sensor holder (10) between the magnetic bearing two groups of stator cores in left and right, totally 4 of discrete permanent magnets (9), along X, positive and negative 4 directions of Y-axis are placed on annulus, between discrete permanent magnet, with aluminum sensor holder (10), separate, sensor probe (T1, T2, T3, T4) be installed on sensor holder (10), T1o to 4 of the center magnetic pole (A1 of sensor probe T1, A4, A5, A8) center A1o, A4o, A5o, the distance of A8o equates, axis and the A1o of T1 pop one's head in, A4o, A5o, the cornerwise mid point of rectangle plane that tetra-points of A8o form intersects, center A1o, the A2o of T2o to 4 of center magnetic pole (A1, A2, A5, A6) of sensor probe T2 is, the distance of A5o, A6o is equal, and the cornerwise mid point of rectangle plane that the axis of the T2 that pops one's head in and A1o, A2o, A5o, tetra-points of A6o form intersects, center A2o, the A3o of T3o to 4 of center magnetic pole (A2, A3, A6, A7) of sensor probe T3 is, the distance of A6o, A7o is equal, and the cornerwise mid point of rectangle plane that the axis of the T3 that pops one's head in and A2o, A3o, A6o, tetra-points of A7o form intersects, center A3o, the A4o of T4o to 4 of center magnetic pole (A3, A4, A7, A8) of sensor probe T4 is, the distance of A7o, A8o is equal, and the cornerwise mid point of rectangle plane that the axis of the T4 that pops one's head in and A3o, A4o, A7o, tetra-points of A8o form intersects, relative two sensor probes (T1, T3) difference output probe that partners, with X-axis angle be 45 °, another two relative sensor probes (T2, T4) form another to difference output probe, with X-axis angle be-45 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210272067.1A CN102829709B (en) | 2012-08-01 | 2012-08-01 | Radial magnetic bearing electrical vortex sensor integrated structure for magnetic levitation high-speed electric machine |
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| CN201210272067.1A CN102829709B (en) | 2012-08-01 | 2012-08-01 | Radial magnetic bearing electrical vortex sensor integrated structure for magnetic levitation high-speed electric machine |
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| CN102829709B true CN102829709B (en) | 2014-10-15 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103715945B (en) * | 2013-12-20 | 2016-04-20 | 北京航空航天大学 | A kind of 12/14 bearing-free permanent magnet biased witch reluctance motor |
| CN104038134B (en) * | 2014-06-24 | 2016-05-25 | 北京航空航天大学 | A kind of permanent-magnet synchronous motor rotor position error calibration method based on linear Hall |
| CN104236909B (en) * | 2014-09-25 | 2017-01-25 | 北京航空航天大学 | Static characteristic test device for radial magnetic bearings |
| CN105716515A (en) | 2014-12-04 | 2016-06-29 | 珠海格力节能环保制冷技术研究中心有限公司 | Current vortex sensor |
| CN107014406B (en) * | 2017-03-16 | 2020-06-12 | 北京航空航天大学 | Self-differential eddy current displacement sensor for magnetic suspension bearing system |
| CN107181359B (en) * | 2017-06-15 | 2023-07-25 | 北京昆腾迈格技术有限公司 | Multilayer permanent magnet bias magnetic suspension unit, magnetic suspension motor and household air conditioner |
| CN107448475B (en) * | 2017-07-31 | 2019-06-11 | 北京航空航天大学 | A kind of Three Degree Of Freedom magnetic bearing and current vortex sensor integral structure |
| CN111023957B (en) * | 2019-12-20 | 2021-05-28 | 北京航空航天大学 | High-temperature-resistant radial displacement sensor device |
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| JP2005282647A (en) * | 2004-03-29 | 2005-10-13 | Ishikawajima Harima Heavy Ind Co Ltd | Magnetic bearing device |
| JP4138735B2 (en) * | 2004-11-29 | 2008-08-27 | 株式会社イワキ | Magnetic bearing |
| CN100398996C (en) * | 2006-12-14 | 2008-07-02 | 北京航空航天大学 | Integrated five freedom electric eddy sensor |
| CN101922511A (en) * | 2010-08-25 | 2010-12-22 | 江苏大学 | Permanent-magnet bias outer rotor radial AC hybrid magnetic bearing |
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