CN102829709A - 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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- CN102829709A CN102829709A CN2012102720671A CN201210272067A CN102829709A CN 102829709 A CN102829709 A CN 102829709A CN 2012102720671 A CN2012102720671 A CN 2012102720671A CN 201210272067 A CN201210272067 A CN 201210272067A CN 102829709 A CN102829709 A CN 102829709A
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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 a kind of magnetic suspension high speed motor and incorporate current vortex sensor of magnetic bearing of being used for can be used as fan blower, compressor and vacuum pump etc. have strict demand to the aspects such as volume, weight and precision of system non-contact displacement sensor.
Background technology
Magnetic bearing has no mechanical friction and wear, need not lubricate and safeguard, allow the rotor high-speed rotation, long, reliability advantages of higher of life-span; Therefore obtained application in many fields such as air compressor, molecular pump, aerogenerator, hydrogenerator, accumulated energy flywheels, and application is still in continuous expansion.The use of magnetic bearing needs the cooperation of sensor to reach the purpose of stable suspersion usually, and needs are surveyed the displacement signal of five degree of freedom in magnetic suspension high speed motor, and existing structure uses current vortex sensor; Each degree of freedom needs a non-contact displacement sensor; For improving the precision of sensor, take difference structure usually, 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 the high speed rotating 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 with preamplifier circuit and sensor probe mostly together; And the performance of forming the electronic devices and components such as amplifier, resistance, electric capacity and diode of amplifying circuit very easily receives Influence 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, the environment for use and the frequency of operation of magnetic levitation rotating mechanisms such as magnetic levitation compressor.
Summary of the invention
Technology of the present invention is dealt with problems and is: the deficiency that overcomes prior art; Provide a kind of magnetic suspension high speed motor with radial direction magnetic bearing current vortex sensor integral structure; Significantly reduced current vortex sensor with and the rotor length of system, greatly improved the adaptive capacity to environment of sensor; And then enlarged the use occasion of magnetic suspension motor, improved the magnetic suspension motor performance.
Technical solution of the present invention is: magnetic suspension high speed motor is with radial direction magnetic bearing current vortex sensor integral structure; Form to displacement sensor probe, the permanent magnet biased hybrid magnetic bearing of control rotor suspension and external sensor signal processing circuit by four paths of surveying the radial displacement signal; Sensor probe is integrated in the permanent magnet biased hybrid magnetic bearing; The sensor probe preamplifier circuit integrates in the control box that is placed on magnetic suspension motor, separates with sensor probe.Wherein permanent magnet biased hybrid magnetic bearing is by magnetic pole (A1～A8), excitation wire circle body (D1～D8) form with the discrete permanent magnet; The magnetic pole of permanent magnet biased hybrid magnetic bearing is a double-decker; 4 magnetic pole of the stator (A1～A4) is formed in 90 ° 4 stator cores of on same circumference, being separated by; Place along X, the positive and negative four direction of Y axle respectively; Same form place 4 stator cores form other 4 magnetic pole of the stator (A5～A8), totally two groups of stator cores constitute magnetic bearings about place double-deck 8 magnetic pole of the stator structures.Magnetic pole A1 on the circumference in the XY plane～A4 90 ° of placements at interval, wherein magnetic pole A1 is placed on X axle positive dirction, and magnetic pole A2 is placed on Y axle negative direction, and magnetic pole A3 is placed on X axle negative direction, and magnetic pole A4 is placed on Y axle positive dirction; For magnetic pole A5～A8 same 90 ° of placements at interval on the circumference that is parallel to the XY plane, wherein magnetic pole A5 is placed on X axle positive dirction, and magnetic pole A6 is placed on Y axle negative direction, and magnetic pole A7 is placed on X axle negative direction, and magnetic pole A8 is placed on Y axle 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 suspend; Magnetic pole A2 and magnetic pole A6 control Y-direction suspend; Magnetic pole A3 and magnetic pole A7 control X-direction suspends, and magnetic pole A4 and the suspension of magnetic pole A8 control Y+ direction, each magnetic pole of the stator are wound with magnetizing coil (D1～D8).
The annulus of forming by discrete permanent magnet and sensor holder between two groups of stator cores about magnetic bearing; Totally 4 of the discrete permanent magnets that the radially integrated magnetic bearing current vortex sensor of magnetic suspension high speed motor usefulness is adopted; Be placed on the annulus along X, positive and negative 4 directions of Y axle; Separate with the aluminum sensor holder between the discrete permanent magnet, and installation probe on the sensor holder (T1～T4).
The center T1o of sensor probe T1 equates to the distance of magnetic pole (A1, A4, A5, A8) center A1o, A4o, A5o, A8o, and promptly the cornerwise mid point of rectangle plane formed of probe axis and A1o, A4o, A5o, four points of A8o is crossing; Sensor probe T2 can be placed on 4 adjacent magnetic pole A1, A2, A5, A6 axially between arbitrary position; But for reducing of the influence of magnetic bearing magnetic field to sensor probe; Preferred version is that the center T2o of probe T2 equates to the distance of magnetic pole (A1, A2, A5, A6) center A1o, A2o, A5o, A6o, and promptly the cornerwise mid point of rectangle plane formed of probe axis and A1o, A2o, A5o, four points of A6o is crossing; Sensor probe T3 can be placed on 4 adjacent magnetic pole A2, A3, A6, A7 axially between arbitrary position; But for reducing of the influence of magnetic bearing magnetic field to sensor probe; Preferred version is that the center T3o of probe T3 equates to the distance of magnetic pole (A2, A3, A6, A7) center A2o, A3o, A6o, A7o, and promptly the cornerwise mid point of rectangle plane formed of probe axis and A2o, A3o, A6o, four points of A7o is crossing; Sensor probe T4 can be placed on 4 adjacent magnetic pole A3, A4, A7, A8 axially between arbitrary position; But for reducing of the influence of magnetic bearing magnetic field to sensor probe; Preferred version is that the center T4o of probe T4 equates to the distance of magnetic pole (A3, A4, A7, A8) center A3o, A4o, A7o, A8o, and promptly the cornerwise mid point of rectangle plane formed of probe axis and A3o, A4o, A7o, four points of A8o is crossing.Two relative sensor probes (T1, T3) the difference output probe that partners, with X axle clamp angle be 45 °; Other is two relative sensor probe (T2; T4) form another to difference output probe, with X axle clamp angle be-45 °, two displacement signals that the every pair of probe is exported become one tunnel differential output signal behind external treatment circuit; Survey the magnetic suspension motor rotor and rotatablely move, promptly test surface is circle.
The present invention's advantage compared with prior art is: eddy current displacement sensor of the present invention and magnetic bearing; The magnetic bearing of the sensor probe of surveying the radial displacement signal and control radial displacement is all concentrated on a magnetic bearing sensor assembly; Greatly saved the space of magnetic suspension motor; Improved the frequency of operation of magnetic suspension motor, reduced the influence of temperature drift, improved the stability of magnetic suspension motor sensor; Enlarged the applicable situation of magnetic suspension motor, the integral body lifting of magnetic suspension motor performance has been had the effect of highly significant.
Description of drawings
Radially integrated magnetic bearing current vortex sensor structural representation Fig. 1 a is front view to Fig. 1 for magnetic suspension high speed motor uses; Fig. 1 b is a rear view; Fig. 1 c is the A-A view; Fig. 1 d is the B-B view; Fig. 1 e is the C-C view; Fig. 1 f is the D-D view;
Fig. 2 is 3-D effect synoptic diagram of the present invention and explosive view;
Fig. 3 surveys the structural front view of body for band of the present invention;
Fig. 4 is the composition synoptic 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 made up 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 by magnetic pole (A1～A8), excitation wire circle body (D1～D8) form with discrete permanent magnet 9.The magnetic pole of permanent magnet biased hybrid magnetic bearing is a double-decker; 4 magnetic pole of the stator (A1～A4) is formed in 90 ° 4 stator cores of on same circumference, being separated by; Place along the positive and negative four direction of X, Y axle respectively, same form place 4 stator cores form other 4 magnetic pole of the stator (A5～A8), totally two groups of stator cores constitute magnetic bearings about place double-deck 8 magnetic pole of the stator structures; Two adjacent stator cores of the left and right sides are one group, form the magnetic pole of X, the positive and negative four direction of Y axle respectively.Shown in Fig. 1 a and Fig. 1 b, magnetic pole A1 on the circumference in the XY plane～A4 90 ° of placements at interval, wherein magnetic pole A1 is placed on X axle positive dirction; Magnetic pole A2 is placed on Y axle negative direction, and magnetic pole A3 is placed on X axle negative direction, and magnetic pole A4 is placed on Y axle positive dirction; For magnetic pole A5～A8 same 90 ° of placements at interval on the circumference that is parallel to the XY plane, wherein magnetic pole A5 is placed on X axle positive dirction, and magnetic pole A6 is placed on Y axle negative direction; Magnetic pole A7 is placed on X axle negative direction, and magnetic pole A8 is placed on Y axle 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 suspend; Magnetic pole A2 and magnetic pole A6 control Y-direction suspend; Magnetic pole A3 and magnetic pole A7 control X-direction suspends, and magnetic pole A4 and the suspension of magnetic pole A8 control Y+ direction, each magnetic pole of the stator are wound with magnetizing coil (D1～D8).
The annulus of forming by discrete permanent magnet and sensor holder between two groups of stator cores about magnetic bearing as shown in Figure 2; Totally 4 of the discrete permanent magnets 9 that the radially integrated magnetic bearing current vortex sensor of magnetic suspension high speed motor usefulness is adopted; Be placed on the annulus along X, positive and negative 4 directions of Y axle; Separate with aluminum sensor holder 10 between the discrete permanent magnet, and installation probe on the sensor holder (T1～T4).Sensor probe is fixed on the sensor holder through 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 formed of probe axis and A1o, A4o, A5o, four points of A8o is crossing 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 formed of probe axis and A1o, A2o, A5o, four points of A6o is crossing shown in Fig. 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 formed of probe axis and A2o, A3o, A6o, four points of A7o is crossing 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 formed of probe axis and A3o, A4o, A7o, four points of A8o is crossing shown in Fig. 1 f.When practical application shown in Fig. 1 a relative two radial displacement transducers probe (differential output is expressed as u1 for T1, T3) the differential output probe that partners; With X axle clamp angle be 45 °, in addition (T2 T4) forms another differential output is popped one's head in two relative radial displacement transducers probes; Differential output is expressed as u3; With X axle clamp angle be-45 °, in subsequent treatment, u1 and u3 are carried out coordinate conversion, it is consistent to make displacement detecting result and magnetic bearing handle direction.
As shown in Figure 3; Magnetic pole (A1～A8) and form magnetic gap between the rotor R; (T1～T4) and form between the rotor R and survey the gap, magnetic gap m1 is generally 0.4mm～0.5mm to sensor probe, surveys gap m2 and generally is all 0.2mm～1.25mm mutually with magnetic gap.
As shown in Figure 4, the prime amplifier of probe T1～T4 mainly is made up 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; Be used for sensor probe coil resonance circuit is provided 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 handled, export to the subsequent control system and use.
As shown in Figure 5, form difference structure between the prime amplifier of displacement sensor probe T1 of the present invention and T3, promptly adopt identical and symmetrical circuit structure.Crystal oscillator is behind the AGC network; Join with the input end of probe T3 two-way sensor probe coil resonance circuit with probe T1 simultaneously; Through difference output behind identical multiplication of voltage detection and the filtering adjustment circuit, 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 in time to float as common-mode signal to suppress mutually, thereby improved the temperature and the time stability of sensor.In like manner, probe T2 also adopts identical structure with probe T4.
Carry out distance detecting through the eddy current mutual inductance effect between detection body among the present invention and the hot-wire coil in the sensor probe; The material of surveying body directly influences performances such as the sensitivity of sensor, precision; The material of surveying body on the 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. magnetic suspension high speed motor is with radial direction magnetic bearing current vortex sensor integral structure; It is characterized in that: form to displacement sensor probe, the permanent magnet biased hybrid magnetic bearing of control rotor suspension and external sensor signal processing circuit by four paths of surveying the radial displacement signal; Sensor probe is integrated in the permanent magnet biased hybrid magnetic bearing; The sensor probe preamplifier circuit integrates in the control box that is placed on magnetic suspension motor, separates with sensor probe; Wherein permanent magnet biased hybrid magnetic bearing is by magnetic pole (A1～A8), excitation wire circle body (D1～D8) form with discrete permanent magnet (9); The magnetic pole of permanent magnet biased hybrid magnetic bearing is a double-decker; 90 ° 4 stator cores of on same circumference, being separated by form 4 magnetic pole of the stator (A1～A4), place along X, the positive and negative four direction of Y axle 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 constitute magnetic bearings about place double-deck 8 magnetic pole of the stator structures; Wherein magnetic pole A1 and magnetic pole A5 control X+ direction suspends, and magnetic pole A2 and magnetic pole A6 control Y-direction suspend, and magnetic pole A3 and magnetic pole A7 control X-direction suspend; Magnetic pole A4 and magnetic pole A8 control Y+ direction suspend, and are wound with magnetizing coil on each magnetic pole of the stator; The annulus of forming by discrete permanent magnet (9) and sensor holder (10) between two groups of stator cores about magnetic bearing; Totally 4 of discrete permanent magnets (9); Place on the annulus along X, positive and negative 4 directions of Y axle; Separate with aluminum sensor holder (10) between the discrete permanent magnet; Sensor probe (T1, T2, T3, T4) is installed on the sensor holder (10), and the distance of the center A1o of T1o to 4 magnetic pole in the center of sensor probe T1 (A1, A4, A5, A8), A4o, A5o, A8o equates that the cornerwise mid point of rectangle plane that the axis of the T1 that promptly pops one's head in and A1o, A4o, A5o, four points of A8o are formed intersects; The distance of the center A1o of T2o to 4 magnetic pole in the center of sensor probe T2 (A1, A2, A5, A6), A2o, A5o, A6o equates that the cornerwise mid point of rectangle plane that the axis of the T2 that promptly pops one's head in and A1o, A2o, A5o, four points of A6o are formed intersects; The distance of the center A2o of T3o to 4 magnetic pole in the center of sensor probe T3 (A2, A3, A6, A7), A3o, A6o, A7o equates that the cornerwise mid point of rectangle plane that the axis of the T3 that promptly pops one's head in and A2o, A3o, A6o, four points of A7o are formed intersects; The distance of the center A3o of T4o to 4 magnetic pole in the center of sensor probe T4 (A3, A4, A7, A8), A4o, A7o, A8o equates that the cornerwise mid point of rectangle plane that the axis of the T4 that promptly pops one's head in and A3o, A4o, A7o, four points of A8o are formed intersects; Two relative sensor probes (T1, T3) the difference output probe that partners, with X axle clamp angle be 45 °, in addition two relative sensor probes (T2 T4) forms another to difference output probe, with X axle clamp angle be-45 °.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103715945A (en) * | 2013-12-20 | 2014-04-09 | 北京航空航天大学 | 12/14 bearingless permanent magnet biased switched reluctance motor |
| CN104038134A (en) * | 2014-06-24 | 2014-09-10 | 北京航空航天大学 | Method for correcting position error of permanent magnet synchronous motor rotor based on linear hall |
| CN104236909A (en) * | 2014-09-25 | 2014-12-24 | 北京航空航天大学 | Static characteristic test device for radial magnetic bearings |
| WO2016086662A1 (en) * | 2014-12-04 | 2016-06-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Eddy current sensor |
| CN107014406A (en) * | 2017-03-16 | 2017-08-04 | 北京航空航天大学 | A kind of autodyne fraction eddy current displacement sensor for magnetic levitation bearing system |
| CN107181359A (en) * | 2017-06-15 | 2017-09-19 | 深圳麦格动力技术有限公司 | Multilayer permanent magnetism off-set magnetic suspension unit, magnetic suspension motor and domestic air conditioning |
| CN107448475A (en) * | 2017-07-31 | 2017-12-08 | 北京航空航天大学 | A kind of Three Degree Of Freedom magnetic bearing and current vortex sensor integral structure |
| CN111023957A (en) * | 2019-12-20 | 2020-04-17 | 北京航空航天大学 | High-temperature-resistant radial displacement sensor device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715945A (en) * | 2013-12-20 | 2014-04-09 | 北京航空航天大学 | 12/14 bearingless permanent magnet biased switched reluctance motor |
| CN104038134A (en) * | 2014-06-24 | 2014-09-10 | 北京航空航天大学 | Method for correcting position error of permanent magnet synchronous motor rotor based on linear hall |
| 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 |
| CN104236909A (en) * | 2014-09-25 | 2014-12-24 | 北京航空航天大学 | Static characteristic test device for radial magnetic bearings |
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| WO2016086662A1 (en) * | 2014-12-04 | 2016-06-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Eddy current sensor |
| CN107014406A (en) * | 2017-03-16 | 2017-08-04 | 北京航空航天大学 | A kind of autodyne fraction eddy current displacement sensor for magnetic levitation bearing system |
| 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 |
| CN107181359A (en) * | 2017-06-15 | 2017-09-19 | 深圳麦格动力技术有限公司 | Multilayer permanent magnetism off-set magnetic suspension unit, magnetic suspension motor and domestic air conditioning |
| 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 |
| CN107448475A (en) * | 2017-07-31 | 2017-12-08 | 北京航空航天大学 | A kind of Three Degree Of Freedom magnetic bearing and current vortex sensor integral structure |
| CN111023957A (en) * | 2019-12-20 | 2020-04-17 | 北京航空航天大学 | High-temperature-resistant radial displacement sensor device |
| 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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