CN102801358B - Bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator - Google Patents
Bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator Download PDFInfo
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- CN102801358B CN102801358B CN201210318930.2A CN201210318930A CN102801358B CN 102801358 B CN102801358 B CN 102801358B CN 201210318930 A CN201210318930 A CN 201210318930A CN 102801358 B CN102801358 B CN 102801358B
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 24
- 230000005284 excitation Effects 0.000 claims description 10
- 230000002457 bidirectional effect Effects 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract 2
- 238000000034 method Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention relates to a bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator and belongs to the field of piezoelectric generation. A cylinder is fixed between two bearing blocks by a bolt; multiple groups of static magnets I and static magnets II are alternately embedded on different cross sections of the internal wall of the cylinder; both the two bearing blocks are embedded with a bearing and a magnetic ring; a main shaft is arranged on the bearing block by the bearing; the spline of the main shaft is sleeved with multiple groups of piezoelectric transducers; and a pair of moving magnets are arranged at the free end of each of the piezoelectric transducers by bolts, and the opposite magnetic poles of the moving magnets are opposite. The piezoelectric generator has the advantages of no contact impact and noise, high reliability, convenience for providing electricity to a monitoring system rotating along with a rotating shaft, and capability of generating power at a constant or high speed.
Description
Technical field
The invention belongs to field of piezoelectric generation, be specifically related to a kind of bidirectional magnetic force coupling axial excitation and spacing rotary shaft piezoelectric generator, power for rotating machinery health monitoring systems.
Background technology
The research utilizing sheet type piezoelectric vibrator to construct microminiature piezoelectric generator has become the focus of domestic and international lasting for years.For generator prime power source and the difference of application purpose, cantilever beam type piezoelectric generator, main involving vibrations formula and the rotary two large types of various structures form are all proposed at present both at home and abroad.Wherein, rotary piezoelectric generator is for solution helicopter screw propeller, automotive tire pressure, aero-engine/bullet train/oil gas bore the self-powered sensor monitoring of the rotating machineries such as main shaft and proposes at first.With regard to generating/power supply capacity, rotary electric magnetic generator is very ripe and be widely used, but because of its need mover and stator to do relative motion and dynamic/stator dimensions is suitable, therefore complex structure, volume are large, cannot or inconvenience be used for some and need small and tele-control system mutually integrated to generator and rotary body.By comparison, sheet type piezoelectric vibrator because structure is simple, volume is little and can be integrated with rotary body, therefore is considered to the effective ways constructing microminiature rotary generator.
According to the difference of energisation mode, the existing rotary shaft piezoelectric generator rotated with rotary body can be divided into 3 large classes: 1. inertia-powered formula, piezoelectric vibrator is utilized to make it along direction of rotation flexural deformation with the change of Impact direction in axle rotation process, the method structure is simple, but be only suitable for low speed, at a high speed, especially even high speed rotating time cannot to produce double-deformation alternately because centrifugal force is excessive and rotary state cataclysm will make piezoelectric vibrator damage because stressed/deformed is excessive; 2. dial type, the piezoelectric vibrator utilizing fixing moving tooth to stir rotation makes it along direction of rotation flexural deformation, and the method easily produces larger impact when high speed and noise is comparatively large, and easily makes piezoelectric vibrator damage because sex change is excessive; 3. impacting type, utilize rotational fall steel ball clash into piezoelectric vibrator, the method is also only applicable to the lower occasion of rotating speed, and exist larger contact impact and noise, also piezoelectric vibrator can be made to damage because of contact impact.
The common feature of the rotary shaft piezoelectric generator that above-mentioned 3 classes are rotated with rotary body is that piezoelectric vibrator is all out of shape along the direction of rotation of rotary body, its deflection and energy output depend on rotating speed and the rotary state of rotary body completely, drawback brought thus is: 1. piezoelectric vibrator deflection is uncontrollable, excessive deformation can cause piezoelectric vibrator cracked, therefore reliability is low; 2. at a high speed, at the uniform velocity, especially even-high speed time, piezoelectric vibrator can not effectively be encouraged, adaptive capacity to environment and frequency bandwidth limited.Visible, existing rotary piezoelectric generator is not suitable for helicopter screw propeller, aero-engine/bullet train/oil gas bores the contour rotating speed of main shaft, at the uniform velocity or the occasion of usage space/structure constraint.Therefore, structure is simple, reliability is high, bandwidth, without impact/noise and be applicable at the uniform velocity/at a high speed, the trunnion piezoelectric generator of especially even-high speed rotating is still badly in need of in a lot of field.
Summary of the invention
The invention provides a kind of bidirectional magnetic force coupling axial excitation and spacing rotary shaft piezoelectric generator, for meeting real-time, the sufficient electrical energy demands needed for rotating machinery health monitoring systems, generator must possess following characteristic: 1. rotate with rotary body, 2. there is enough generating capacities, 3. at the uniform velocity and high speed time all can generate electricity and there is higher reliability.
The technical scheme that the present invention takes is: be screwed connection cylinder between two bearing pedestals one and bearing pedestal two, the varying cross-section of described cylinder inner wall is alternately inlayed many group fixed magnets one and fixed magnet two, and the magnetic pole of described fixed magnet one and fixed magnet two to be installed and pole orientation is contrary along the radial direction of described cylinder; Described bearing pedestal one and bearing pedestal two are inlaid with bearing and magnet ring respectively, and the pole polarity that described bearing pedestal one and the magnet ring on bearing pedestal two point in cylinder is identical with the pole polarity that the moving magnet one be adjacent or moving magnet two point in cylinder; Main shaft is arranged on two described bearing pedestals and upper by described two bearings, have PZT (piezoelectric transducer) at the spline upper sleeve of described main shaft, described PZT (piezoelectric transducer) of often organizing is crimped between two described bearings by a pair ladder back-up ring, short a pair back-up ring and each long back-up ring; Each group PZT (piezoelectric transducer) described is by the cantilever beam on metal substrate and piezoelectric chip is bonding forms, and is provided with splined hole in the center of the metal substrate of described PZT (piezoelectric transducer); A pair moving magnet one and moving magnet two opposite pole are relatively arranged on the free end of described PZT (piezoelectric transducer) by screw, the moving magnet one on described same group of PZT (piezoelectric transducer) is identical with the axial arrangement direction of moving magnet two magnetic pole, the axial arrangement direction of moving magnet one on two adjacent groups PZT (piezoelectric transducer) and moving magnet two magnetic pole is contrary; The polarity of the moving magnet one adjacent with magnet ring or the magnetic pole of moving magnet two is identical with the pole polarity that described magnet ring points to inside cylinder.
Rotary main shaft during bidirectional magnetic force of the present invention coupling axial excitation spacing rotary shaft piezoelectric generator can be used for moving or hard-wired rotary main shaft.Such as, the main shaft of aircraft and Steam Screw etc. is while rotating around its centre of gyration, also with aircraft or steamer motion, when aircraft and the motion of steamer acceleration or deceleration, PZT (piezoelectric transducer) also can produce the flexural deformation along main-shaft axis direction under the effect of himself and moving magnet inertia force; For the main shaft of the lathe fixed etc., in the process of transporting and assemble, also there is the possibility making PZT (piezoelectric transducer) produce moderate finite deformation.Therefore, the present invention inlays magnet ring on bearing pedestal, also make the like pole between the moving magnet on two groups of adjacent PZT (piezoelectric transducer)s be mounted opposite simultaneously, thus to make between magnet ring and the moving magnet be adjacent and to produce repulsive force between moving magnet on PZT (piezoelectric transducer) that two groups adjacent, avoid PZT (piezoelectric transducer) to damage because deflection is excessive.
In the present invention, be positioned at the magnet ring on bearing pedestal and the pivot of the fixed magnet one that is positioned on cylinder and fixed magnet two relative main is fixed, and PZT (piezoelectric transducer) and the moving magnet that is placed in PZT (piezoelectric transducer) free end rotate with main shaft.The effect being positioned at the magnet ring on bearing pedestal applies repulsive force to PZT (piezoelectric transducer) close with it, and this repulsive force is transmitted vertically by the repulsive interaction of the moving magnet like pole on two groups of adj acent piezoelectric transducers, thus PZT (piezoelectric transducer) is avoided to produce excessive axial deformation; Be positioned at moving magnet one on cylinder and moving magnet two effect applies thrust alternately to the moving magnet rotated, thus PZT (piezoelectric transducer) is vibrated along the axial bending of main shaft, and convert mechanical energy to electric energy; To be fixed on main shaft because of PZT (piezoelectric transducer) and to rotate with it, being convenient to generated electric energy directly be supplied the sensing and monitoring system rotated with main shaft.
Characteristic of the present invention is: adopt bidirectional magnetic force coupling to complete axial excitation and the deformation amount controlling of PZT (piezoelectric transducer), reliability is high simultaneously; The bending deformation quantity of piezoelectric vibrator and energy output determine primarily of the magnetic field intensity between magnetic pole, the state variation such as rotating shaft speedup, deceleration and rotating speed height directly affect its nothing, therefore adaptable to rotating speed, under various rotary state, there is stronger generating capacity.
Advantage of the present invention is: 1. PZT (piezoelectric transducer) realizes noncontact axial excitation and distortion protection with main axis by bidirectional magnetic force coupling, and contactless impact and noise, reliability is high and be convenient to electric energy is supplied to the monitoring system of rotating with rotating shaft; 2. PZT (piezoelectric transducer) along main shaft axial bending distortion, deflection and energy output do not affect by rotating shaft rotary state, at the uniform velocity and high speed time all can generate electricity.
Accompanying drawing explanation
Fig. 1 is the structural principle sketch of generator in a preferred embodiment of the present invention;
Fig. 2 is the A-A view of Fig. 1;
Fig. 3 is the structural representation of PZT (piezoelectric transducer) in a preferred embodiment of the present invention;
Fig. 4 is the B-B profile of Fig. 3;
Fig. 5 is the I portion enlarged drawing of Fig. 1;
Fig. 6 is the II portion enlarged drawing of Fig. 1;
Embodiment
Bidirectional magnetic force coupling axial excitation proposed by the invention spacing rotary shaft piezoelectric generator can be used for all kinds rotating member, as helicopter screw propeller, aero-engine, bullet train, oil gas bore main shaft etc.For different application scenarios, may there is certain difference in the concrete structure of rotating member, but do not affect novelty of the present invention and creativeness, is now applied as example with rotor shaft, illustrates embodiments of the present invention:
Two bearing pedestals 1 and bearing pedestal 21 ' between be screwed connect cylinder 2, the varying cross-section of described cylinder 2 inwall is alternately inlayed many group fixed magnets 1 and fixed magnet 24, and the magnetic pole of ', described fixed magnet 1 and fixed magnet 24 ' to be installed and pole orientation is contrary along the radial direction of described cylinder 2; Magnet ring 12 at described bearing pedestal 1 and bearing pedestal 21 on ' on be inlaid with bearing 5 and magnet ring 12 respectively, and described bearing pedestal 1 and bearing pedestal 21 ' points to pole polarity in cylinder 2 and the moving magnet 1 be adjacent or moving magnet 24 ' pole polarity pointed in cylinder 2 is identical; Main shaft 6 is arranged on described two bearing pedestals 1 and 1 ' by described two bearings 5, on the spline 601 of described main shaft 6, cover has PZT (piezoelectric transducer) 7, and described PZT (piezoelectric transducer) 7 of often organizing is crimped between two described bearings 5 by a pair ladder back-up ring 8, short a pair back-up ring 9 and each long back-up ring 10; Each group PZT (piezoelectric transducer) 7 described is by the cantilever beam 7011 on metal substrate 701 and piezoelectric chip 702 is bonding forms, and is provided with splined hole 703 in the center of the metal substrate of described PZT (piezoelectric transducer) 7; The axial arrangement direction of a pair moving magnet 1 and moving magnet 2 11 ' opposite pole be relatively arranged on the free end of described PZT (piezoelectric transducer) 7, the moving magnet 1 on described same group of PZT (piezoelectric transducer) 7 and moving magnet 2 11 by screw ' magnetic pole is identical, moving magnet 1 on two adjacent groups PZT (piezoelectric transducer) 7 and moving magnet 2 11 ' the axial arrangement direction of magnetic pole is contrary; The moving magnet one 11 adjacent with magnet ring 12 or moving magnet 2 11 ' the polarity of magnetic pole identical with the pole polarity that described magnet ring 12 points to inside cylinder 2.
Rotary main shaft during bidirectional magnetic force of the present invention coupling axial excitation spacing rotary shaft piezoelectric generator can be used for moving or hard-wired rotary main shaft.Such as, the main shaft 6 of aircraft and Steam Screw etc. is while rotating around its centre of gyration, also with aircraft or steamer motion, when aircraft and the motion of steamer acceleration or deceleration, PZT (piezoelectric transducer) 7 is at himself and moving magnet 1 and moving magnet 2 11 ' also can produce flexural deformation along main shaft 6 axis direction under the effect of inertia force; For the main shaft 6 of fixing lathe etc., in the process of transporting and assemble, also there is the possibility making PZT (piezoelectric transducer) 7 produce moderate finite deformation.Therefore, the present invention is at bearing pedestal 1 and bearing pedestal 21 ' on inlay magnet ring 12, also make the moving magnet 1 on two groups of adjacent PZT (piezoelectric transducer)s 7 and moving magnet 2 11 simultaneously ' between like pole be mounted opposite, thus make magnet ring 12 and the moving magnet 1 be adjacent or moving magnet 2 11 between ' between and moving magnet 1 on two groups of adjacent PZT (piezoelectric transducer)s 7 and moving magnet 2 11 ' and produce repulsive force, avoid PZT (piezoelectric transducer) 7 to damage because deflection is excessive.
In the present invention, the pivot of ' on magnet ring 12 and the fixed magnet 1 be positioned on cylinder 2 and the fixed magnet 24 ' relative main 6 that is positioned at bearing pedestal 1 and bearing pedestal 21 is fixed, and PZT (piezoelectric transducer) 7 and be placed in moving magnet 1 and the moving magnet 2 11 of PZT (piezoelectric transducer) 7 free end ' rotate with main shaft 6.Be positioned at bearing pedestal 1 and bearing pedestal 21 ' on the effect of magnet ring 12 be apply repulsive force to PZT (piezoelectric transducer) 7 close with it, and this repulsive force is by the moving magnet 1 on two groups of adj acent piezoelectric transducers 7 and moving magnet 2 11 ' repulsive interaction of like pole transmits vertically, thus avoids PZT (piezoelectric transducer) 7 to produce excessive axial deformation; Being positioned at the moving magnet 1 on cylinder 2 and moving magnet 24 ' effect is the thrust applying alternately to the moving magnet 11 rotated or moving magnet 11 ', thus PZT (piezoelectric transducer) 7 vibrated along the axial bending of main shaft 6, and convert mechanical energy to electric energy; To be fixed on main shaft 6 because of PZT (piezoelectric transducer) 7 and to rotate with it, being convenient to generated electric energy directly to supply the sensing and monitoring system rotated with main shaft 6.
In the present invention, magnetic field force excitation PZT (piezoelectric transducer) axial bending is out of shape and to limit the process of its deflection as follows:
When main shaft 6 rotate make moving magnet 1 and moving magnet 2 11 ' go to below and with moving magnet 1 near time, from left to right first, the 3rd, the 5th PZT (piezoelectric transducer) 7 to the right bending, second, the 4th, the 6th PZT (piezoelectric transducer) 7 bends left, therefore adjacent first and second, the 3rd and the 4th, moving magnet 1 on the 5th and the 6th PZT (piezoelectric transducer) 7 and moving magnet 2 11 ' N extremely close to each other, produce the repulsive force increased gradually, thus suppress PZT (piezoelectric transducer) 7 because acting on by fixed magnet 1 deflection produced, when main shaft 6 rotate make moving magnet 1 and moving magnet 2 11 ' go to top and with moving magnet 24 ' near time, from left to right first, 3rd, 5th piezoelectric ring energy 7 bends left, second, 4th, 6th piezoelectric ring energy 7 bends to the right, then adjacent second and the 3rd, moving magnet on 4th and the 5th PZT (piezoelectric transducer) 71 and moving magnet 2 11 ' S extremely close to each other, first and the 6th moving magnet 1 on piezoelectric vibrator or moving magnet 2 11 ' S pole extremely close with the S being adjacent magnet ring 12, produce the repulsive force increased gradually, thus suppress PZT (piezoelectric transducer) 7 because being subject to fixed magnet 24 ' act on the deflection produced.
The like pole that in the piezoelectric generator course of work of the present invention, utilizes moving magnet 1 and moving magnet 2 11 between ' and fixed magnet 1 or moving magnet 24 ' near time the repulsive force that produces encourage piezoelectric vibrator axial deformation; Simultaneously, also utilize the moving magnet 1 on adjacent two PZT (piezoelectric transducer)s 7 and moving magnet 2 11 ' between repulsive force and and magnet ring 12 adj acent piezoelectric transducer 7 on moving magnet 1 or moving magnet 2 11 ' and the like pole of described magnet ring 12 between repulsive force limit the deflection of PZT (piezoelectric transducer), thus avoid damaging because deflection is excessive.
Claims (1)
1. bidirectional magnetic force coupling axial excitation spacing rotary shaft piezoelectric generator, it is characterized in that: between two bearing pedestals one and bearing pedestal two, be screwed connection cylinder, the varying cross-section of described cylinder inner wall is alternately inlayed many group fixed magnets one and fixed magnet two, and the magnetic pole of described fixed magnet one and fixed magnet two to be installed and pole orientation is contrary along the radial direction of described cylinder; Described bearing pedestal one and bearing pedestal two are inlaid with bearing and magnet ring respectively, and the pole polarity that described bearing pedestal one and the magnet ring on bearing pedestal two point in cylinder is identical with the pole polarity that the moving magnet one be adjacent or moving magnet two point in cylinder; Main shaft is arranged on two described bearing pedestals by described two bearings, has PZT (piezoelectric transducer) at the spline upper sleeve of described main shaft, and described PZT (piezoelectric transducer) is crimped between two described bearings by a pair ladder back-up ring, short a pair back-up ring and each long back-up ring; Described PZT (piezoelectric transducer) is by the cantilever beam on metal substrate and piezoelectric chip is bonding forms, and is provided with splined hole in the center of the metal substrate of described PZT (piezoelectric transducer); A pair moving magnet one and moving magnet two opposite pole are relatively arranged on the free end of described PZT (piezoelectric transducer) by screw, the moving magnet one on described PZT (piezoelectric transducer) is identical with the axial arrangement direction of moving magnet two magnetic pole, the axial arrangement direction of moving magnet one on two adjacent groups PZT (piezoelectric transducer) and moving magnet two magnetic pole is contrary; The polarity of the moving magnet one adjacent with magnet ring or the magnetic pole of moving magnet two is identical with the pole polarity that described magnet ring points to inside cylinder.
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| CN201210318930.2A CN102801358B (en) | 2012-09-01 | 2012-09-01 | Bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator |
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| CN201210318930.2A CN102801358B (en) | 2012-09-01 | 2012-09-01 | Bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator |
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| CN102801358A CN102801358A (en) | 2012-11-28 |
| CN102801358B true CN102801358B (en) | 2015-06-10 |
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Families Citing this family (7)
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| CN103973161A (en) * | 2014-04-25 | 2014-08-06 | 天津大学 | Rotation piezoelectric energy collecting device |
| CN107395051B (en) * | 2017-08-17 | 2023-05-16 | 浙江师范大学 | Generator for railway train bearing monitoring system |
| CN107395047B (en) * | 2017-08-17 | 2023-05-16 | 浙江师范大学 | Gyromagnetic radial tension-compression excited piezoelectric generator |
| CN107332463B (en) * | 2017-08-17 | 2023-05-26 | 浙江师范大学 | Novel generator for train bearing monitoring system |
| CN107482868B (en) * | 2017-08-17 | 2023-05-26 | 浙江师范大学 | Magnetic coupling step-by-step excitation water flow generator |
| CN107359815B (en) * | 2017-08-17 | 2023-05-16 | 浙江师范大学 | Radial tension-compression excited rotary piezoelectric generator |
| CN112187100B (en) * | 2020-11-15 | 2021-09-24 | 浙江师范大学 | Rotary self-excitation energy harvester with shaft end suspended |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510740A (en) * | 2009-04-02 | 2009-08-19 | 吴速 | System for driving piezoelectric material to generate electricity by utilizing wind energy |
| CN102025289A (en) * | 2010-11-18 | 2011-04-20 | 中兴通讯股份有限公司 | Portable generating set and intelligent terminal |
| CN102223106A (en) * | 2010-04-18 | 2011-10-19 | 周耀瑜 | Permanent-magnet pressure electronic power generator technology |
| CN202721624U (en) * | 2012-09-01 | 2013-02-06 | 浙江师范大学 | Bidirectional magnetic force coupling axial excitation and limit type rotating shaft type piezoelectric generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002369554A (en) * | 2001-06-06 | 2002-12-20 | Nec Tokin Corp | Indicator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101510740A (en) * | 2009-04-02 | 2009-08-19 | 吴速 | System for driving piezoelectric material to generate electricity by utilizing wind energy |
| CN102223106A (en) * | 2010-04-18 | 2011-10-19 | 周耀瑜 | Permanent-magnet pressure electronic power generator technology |
| CN102025289A (en) * | 2010-11-18 | 2011-04-20 | 中兴通讯股份有限公司 | Portable generating set and intelligent terminal |
| CN202721624U (en) * | 2012-09-01 | 2013-02-06 | 浙江师范大学 | Bidirectional magnetic force coupling axial excitation and limit type rotating shaft type piezoelectric generator |
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Inventor after: Wang Bin Inventor after: Wang Shuyun Inventor after: Han Junwu Inventor after: Cai Jiancheng Inventor after: Yin Xiaohong Inventor after: Zhang Zhonghua Inventor after: Zeng Ping Inventor before: Wang Shuyun Inventor before: Han Junwu Inventor before: Xu Hailong Inventor before: Cai Jiancheng Inventor before: Yin Xiaohong Inventor before: Zeng Ping |
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