CN102801358A - 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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- CN102801358A CN102801358A CN2012103189302A CN201210318930A CN102801358A CN 102801358 A CN102801358 A CN 102801358A CN 2012103189302 A CN2012103189302 A CN 2012103189302A CN 201210318930 A CN201210318930 A CN 201210318930A CN 102801358 A CN102801358 A CN 102801358A
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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 the piezo-electric generating field, be specifically related to a kind of bidirectional magnetic force coupling axial excitation and spacing rotary shaft piezoelectric generator, be used for the power supply of rotating machinery health monitoring systems.
Background technology
The research that utilizes the sheet type piezoelectric vibrator to construct the microminiature piezoelectric generator has become the focus of domestic and international lasting for years.To the difference of generator prime power source and application purpose, the beam type piezoelectric generator of multiple version has all been proposed at present, main involving vibrations formula and rotary two major types both at home and abroad.Wherein, rotary piezoelectric generator is to propose for the self-powered sensor monitoring that solves helicopter screw propeller, automotive tire pressure, aero-engine/bullet train/rotating machineries such as oil gas brill main shaft at first.With regard to generating/power supply capacity; The rotary electric magnetic generator is very ripe and be widely used; But, it does that relative motion and moving/stator dimensions is suitable because of needing mover and stator; So complex structure, volume are big, can't or inconvenience be used for the small and tele-control system that some need be mutually integrated with generator and rotary body.By comparison, the sheet type piezoelectric vibrator because of simple in structure, volume is little and can be integrated with rotary body, so be considered to construct the effective ways of microminiature rotary generator.
Difference according to energisation mode; The existing rotary shaft piezoelectric generator that rotates with rotary body can be divided into 3 big types: 1. inertia-powered formula; Utilize piezoelectric vibrator to make it along direction of rotation flexural deformation with the variation that receives force direction in the axle rotation process; This method is simple in structure, but only is suitable for low speed, at a high speed, can't produce double-deformation and rotary state cataclysm alternately because of centrifugal force is excessive during especially even high speed rotating piezoelectric vibrator will be damaged because of stressed/deformed is excessive; 2. dial type, the piezoelectric vibrator that utilizes fixing moving tooth to stir rotation makes it along direction of rotation flexural deformation, and this method is prone to produce bigger impact and noise when high speed bigger, and be prone to make piezoelectric vibrator to damage because of sex change is excessive; 3. impacting type, the steel ball bump piezoelectric vibrator that utilizes rotation to fall, this method also is only applicable to the lower occasion of rotating speed, and has bigger contact impact and noise, also piezoelectric vibrator is damaged because of contact impact.
Above-mentioned 3 types of common features with the rotary shaft piezoelectric generator of rotary body rotation are that piezoelectric vibrator all is out of shape along the direction of rotation of rotary body; Its deflection and energy output depend on the rotating speed and the rotary state of rotary body fully; The drawback of being brought thus is: 1. the piezoelectric vibrator deflection is uncontrollable; Excessive deformation can cause piezoelectric vibrator cracked, so reliability is low; 2. at a high speed, at the uniform velocity, especially even-during high speed, piezoelectric vibrator can be by effective excitation, adaptive capacity to environment and frequency bandwidth are limited.It is thus clear that existing rotary piezoelectric generator is not suitable for helicopter screw propeller, aero-engine/bullet train/oil gas and bores high rotating speed such as main shaft, at the uniform velocity or usage space/structure occasions with limited.Therefore, simple in structure, reliability is high, bandwidth, nothing impact/noise and be applicable at the uniform velocity/at a high speed, especially the novel rotary shaft piezoelectric generator of even-high speed rotating still is that a lot of field is badly in need of.
Summary of the invention
The present invention provides a kind of bidirectional magnetic force coupling axial excitation and spacing rotary shaft piezoelectric generator; For satisfying required real-time, the sufficient power requirement of rotating machinery health monitoring systems; Generator must possess following characteristic: 1. rotate with rotary body; 2. have enough generating capacities, all can generate electricity and have higher reliability when 3. at the uniform velocity reaching high speed.
The technical scheme that the present invention takes is: be screwed the connection cylinder between two bearing pedestals one and the bearing pedestal two; On the varying cross-section of said cylinder inner wall, alternately inlay many group fixed magnets one and fixed magnet two, the magnetic pole of said fixed magnet one and fixed magnet two is opposite along the radially installation and the pole orientation of said cylinder; On described bearing pedestal one and bearing pedestal two, be inlaid with bearing and magnet ring respectively, and said bearing pedestal one and magnet ring on the bearing pedestal two to point to the interior pole polarity of pole polarity and the moving magnet that is adjacent one or moving magnet two sensing cylinders in the cylinder identical; Main shaft through described two Bearing Installation described two bearing pedestals with on; Spline upper sleeve at said main shaft has PZT (piezoelectric transducer), and said every group of PZT (piezoelectric transducer) is crimped between described two bearings by a pair of ladder back-up ring, a pair of short back-up ring and each long back-up ring; Said each group PZT (piezoelectric transducer) is by the cantilever beam on the metal substrate and piezoelectric chip is bonding forms, and is provided with splined hole in the center of the metal substrate of said PZT (piezoelectric transducer); A pair of moving magnet one and moving magnet two opposite poles relatively are installed in the free end of said PZT (piezoelectric transducer) through screw, the moving magnet one on the said same group of PZT (piezoelectric transducer) is identical with the axial arrangement direction of moving magnet two magnetic poles, the axial arrangement of the moving magnet one on the two adjacent groups PZT (piezoelectric transducer) and moving magnet two magnetic poles is in the opposite direction; It is identical to point to the inboard pole polarity of cylinder on the polarity of the moving magnet one adjacent with magnet ring or the magnetic pole of moving magnet two and the said magnet ring.
Rotary main shaft or hard-wired rotary main shaft during bidirectional magnetic force coupling axial excitation of the present invention and spacing rotary shaft piezoelectric generator can be used for moving.For example; The main shaft of aircraft and Steam Screw etc. is when its centre of gyration rotates; Also with the motion of aircraft or steamer, when aircraft and steamer quickens or during retarded motion, PZT (piezoelectric transducer) also can produce along the flexural deformation of main-shaft axis direction under the effect of himself and moving magnet inertia force; For the main shaft of fixing lathe etc., in the process of transportation and assembling, also exist make that PZT (piezoelectric transducer) produces moderate finite deformation maybe.Therefore; The present invention inlays magnet ring on bearing pedestal; Two groups of like poles between the moving magnet on the adjacent PZT (piezoelectric transducer) are installed relatively; Thereby produce repulsive force between the moving magnet that makes magnet ring and be adjacent and between the moving magnet on two groups of adjacent PZT (piezoelectric transducer)s, avoid PZT (piezoelectric transducer) to damage because of deflection is excessive.
In the present invention, be positioned at the magnet ring on the bearing pedestal and the fixed magnet one and the pivot of fixed magnet two relative main shafts that are positioned on the cylinder are fixed, and PZT (piezoelectric transducer) and place the free-ended moving magnet of PZT (piezoelectric transducer) with main axis rotation.The effect that is positioned at the magnet ring on the bearing pedestal be to it near PZT (piezoelectric transducer) apply repulsive force; And this repulsive force transmits through the repulsive interaction of the moving magnet like pole on two groups of adjacent PZT (piezoelectric transducer)s vertically, thereby avoids PZT (piezoelectric transducer) to produce excessive axial deformation; The moving magnet one and moving magnet two effects that are positioned on the cylinder are that the moving magnet that rotates is applied thrust alternately, thereby make the axial bending vibration of PZT (piezoelectric transducer) along main shaft, and convert mechanical energy to electric energy; Rotate because of PZT (piezoelectric transducer) is fixed on the main shaft and with it, be convenient to the electric energy that is generated is directly supplied with the sensing and monitoring system with main axis rotation.
Characteristic of the present invention is: adopt the bidirectional magnetic force coupling to accomplish the axial excitation and the deflection control of PZT (piezoelectric transducer) simultaneously, reliability is high; The bending deformation quantity of piezoelectric vibrator and energy output are mainly determined by the magnetic field intensity between magnetic pole; Rotating shaft speedup, deceleration, and state variation such as rotating speed height it does not had directly influence; Therefore strong to the rotating speed adaptive capacity, stronger generating capacity is all arranged under various rotary states.
Advantage of the present invention is: 1. PZT (piezoelectric transducer) rotates, and realizes noncontact axial excitation and distortion protection through the bidirectional magnetic force coupling with main shaft, and contactless impact and noise, reliability is high and be convenient to electric energy is offered the monitoring system with the rotating shaft rotation; 2. PZT (piezoelectric transducer) is along the distortion of main shaft axial bending, and deflection and energy output are not influenced by the rotating shaft rotary state, all can generate electricity when at the uniform velocity reaching high speed.
Description of drawings
Fig. 1 is a generator Structure principle sketch in 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 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 and spacing rotary shaft piezoelectric generator proposed by the invention can be used for all kinds rotating member, bore main shaft etc. like helicopter screw propeller, aero-engine, bullet train, oil gas.To different application scenarios, possibly there is certain difference in the concrete structure of rotating member, but does not influence novelty of the present invention and creativeness, is applied as example with rotor shaft, specifies execution mode of the present invention at present:
Two bearing pedestals 1 and bearing pedestal 21 ' between be screwed and connect cylinder 2; The magnetic pole of ', said fixed magnet 1 and fixed magnet 24 ' is opposite along the radially installation and the pole orientation of said cylinder 2 on the varying cross-section of said cylinder 2 inwalls, alternately to inlay many group fixed magnets 1 and fixed magnets 24; Pole polarity and moving magnet that is adjacent 1 or moving magnet 24 that 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 said bearing pedestal 1 and bearing pedestal 21 ' points in the cylinders 2 ' the interior pole polarity of sensing cylinder 2 is identical; Main shaft 6 is installed on described two bearing pedestals 1 and 1 ' through described two bearings 5; On the spline 601 of said main shaft 6, be with PZT (piezoelectric transducer) 7, said every group of PZT (piezoelectric transducer) 7 is crimped between described two bearings 5 by a pair of ladder back-up ring 8, a pair of short back-up ring 9 and each long back-up ring 10; Said each group PZT (piezoelectric transducer) 7 is by cantilever beam on the metal substrate 701 7011 and piezoelectric chip 702 bonding forming, and is provided with splined hole 703 in the center of the metal substrate of said PZT (piezoelectric transducer) 7; The axial arrangement direction of a pair of moving magnet 1 and moving magnet 2 11 ' opposite pole relatively be installed in the free end of said PZT (piezoelectric transducer) 7 through screw, moving magnet 1 and moving magnet 2 11 on the said same group of PZT (piezoelectric transducer) 7 ' magnetic pole is identical, moving magnet 1 and moving magnet 2 11 on the two adjacent groups PZT (piezoelectric transducer) 7 ' axial arrangement of magnetic pole is in the opposite direction; Moving magnet one 11 or the moving magnet two 11 adjacent with magnet ring 12 ' polarity and the said magnet ring 12 of magnetic pole on to point to the inboard pole polarity of cylinder 2 identical.
Rotary main shaft or hard-wired rotary main shaft during bidirectional magnetic force coupling axial excitation of the present invention and spacing rotary shaft piezoelectric generator can be used for moving.For example; The main shaft 6 of aircraft and Steam Screw etc. is when its centre of gyration rotates; Also with aircraft or steamer motion; When aircraft and steamer quicken or during retarded motion, PZT (piezoelectric transducer) 7 is at himself and moving magnet 1 and moving magnet 2 11 ' also can produce along the flexural deformation of main shaft 6 axis directions under the effect of inertia force; For the main shaft 6 of fixing lathe etc., in the process of transportation and assembling, also exist make that PZT (piezoelectric transducer) 7 produces moderate finite deformations maybe.Therefore; The present invention is at bearing pedestal 1 and bearing pedestal 21 ' on inlay magnet ring 12; Also make two groups of moving magnet 1 and moving magnets 2 11 on the adjacent PZT (piezoelectric transducer) 7 simultaneously ' between like pole install relatively; Produce repulsive force between thereby moving magnet 1 that makes magnet ring 12 and be adjacent or the moving magnet 2 11 ' between and moving magnet 1 and moving magnet 2 11 on two groups of adjacent PZT (piezoelectric transducer)s 7 ', avoid PZT (piezoelectric transducer) 7 to damage because of deflection is excessive.
In the present invention; Be positioned at bearing pedestal 1 and bearing pedestal 21 ' on magnet ring 12 and be positioned at the fixed magnet 1 and fixed magnet 24 on the cylinder 2 ' relatively the pivot of main shaft 6 fix, and PZT (piezoelectric transducer) 7 and place PZT (piezoelectric transducer) 7 free-ended moving magnets 1 and moving magnets 2 11 ' with main shaft 6 rotations.Be positioned at bearing pedestal 1 and bearing pedestal 21 ' on the effect of magnet ring 12 be to it near PZT (piezoelectric transducer) 7 apply repulsive force; And this repulsive force is through moving magnet on two groups of adjacent PZT (piezoelectric transducer)s 71 and moving magnet 2 11 ' repulsive interaction of like pole transmits vertically, thereby avoids PZT (piezoelectric transducer) 7 to produce excessive axial deformation; Being positioned at moving magnet 1 and moving magnet 24 on the cylinder 2 ' effect is that the moving magnet 11 of rotation or moving magnet 11 ' are applied thrust alternately, thus make the axial bending vibration of PZT (piezoelectric transducer) 7 along main shaft 6, and convert mechanical energy to electric energy; Rotate because of PZT (piezoelectric transducer) 7 is fixed on the main shaft 6 and with it, be convenient to the electric energy that is generated is directly supplied with the sensing and monitoring system with main shaft 6 rotations.
Magnetic field force excitation PZT (piezoelectric transducer) axial bending distortion and to limit the process of its deflection following among the present invention:
When main shaft 6 rotation makes moving magnet 1 and moving magnet 2 11 ' go to the below and with moving magnet 1 near the time; The first, the 3rd, the 5th PZT (piezoelectric transducer) 7 from left to right is crooked to the right, the second, the 4th, the 6th PZT (piezoelectric transducer) 7 is crooked left; Therefore moving magnet 1 and moving magnet 2 11 on adjacent first and second, the 3rd and the 4th, the 5th and the 6th PZT (piezoelectric transducer) 7 ' N extremely each other near; Produce the repulsive force that increases gradually, thereby suppress the deflection of PZT (piezoelectric transducer) 7 because of produced by fixed magnet one 4 effects; When main shaft 6 rotation makes moving magnet 1 and moving magnet 2 11 ' go to top and with moving magnet 24 ' near the time; The first, the 3rd, the 5th piezoelectric ring ability 7 from left to right is crooked left, the second, the 4th, the 6th piezoelectric ring ability 7 is crooked to the right; The S utmost point of moving magnet 1 on the second and the 3rd, the 4th and the 5th then adjacent PZT (piezoelectric transducer) 7 and moving magnet 2 11 ' S extremely each other near moving magnet 1 or moving magnet 2 11 on, the first and the 6th piezoelectric vibrator ' and the S utmost point that is adjacent magnet ring 12 near; Produce the repulsive force that increases gradually, thereby suppress PZT (piezoelectric transducer) 7 because of receiving fixed magnet 24 ' act on the deflection that is 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 the time repulsive force excitation piezoelectric vibrator axial deformation that produces; Simultaneously; Also utilize moving magnet 1 and moving magnet 2 11 on adjacent two PZT (piezoelectric transducer)s 7 ' between repulsive force and and magnet ring 12 adjacent PZT (piezoelectric transducer)s 7 on moving magnet 1 or moving magnet 2 11 ' and the like pole of said magnet ring 12 between the deflection of repulsive force restriction PZT (piezoelectric transducer), thereby avoid damaging because of deflection is excessive.
Claims (1)
1. bidirectional magnetic force coupling axial excitation and spacing rotary shaft piezoelectric generator; It is characterized in that: be screwed the connection cylinder between two bearing pedestals one and the bearing pedestal two; On the varying cross-section of said cylinder inner wall, alternately inlay many group fixed magnets one and fixed magnet two, the magnetic pole of said fixed magnet one and fixed magnet two is opposite along the radially installation and the pole orientation of said cylinder; On described bearing pedestal one and bearing pedestal two, be inlaid with bearing and magnet ring respectively, and said bearing pedestal one and magnet ring on the bearing pedestal two to point to the interior pole polarity of pole polarity and the moving magnet that is adjacent one or moving magnet two sensing cylinders in the cylinder identical; Main shaft through described two Bearing Installation described two bearing pedestals with on; Spline upper sleeve at said main shaft has PZT (piezoelectric transducer), and said every group of PZT (piezoelectric transducer) is crimped between described two bearings by a pair of ladder back-up ring, a pair of short back-up ring and each long back-up ring; Said each group PZT (piezoelectric transducer) is by the cantilever beam on the metal substrate and piezoelectric chip is bonding forms, and is provided with splined hole in the center of the metal substrate of said PZT (piezoelectric transducer); A pair of moving magnet one and moving magnet two opposite poles relatively are installed in the free end of said PZT (piezoelectric transducer) through screw, the moving magnet one on the said same group of PZT (piezoelectric transducer) is identical with the axial arrangement direction of moving magnet two magnetic poles, the axial arrangement of the moving magnet one on the two adjacent groups PZT (piezoelectric transducer) and moving magnet two magnetic poles is in the opposite direction; It is identical to point to the inboard pole polarity of cylinder on the polarity of the moving magnet one adjacent with magnet ring or the magnetic pole of moving magnet two and the said magnet ring.
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN102801358A (en) | 2012-11-28 |
| CN102801358B CN102801358B (en) | 2015-06-10 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973161A (en) * | 2014-04-25 | 2014-08-06 | 天津大学 | Rotation piezoelectric energy collecting device |
| CN107332463A (en) * | 2017-08-17 | 2017-11-07 | 浙江师范大学 | A kind of new type train bearing monitor system generator |
| CN107359815A (en) * | 2017-08-17 | 2017-11-17 | 浙江师范大学 | A kind of rotary piezoelectric generator of radial direction tension and compression excitation |
| CN107395051A (en) * | 2017-08-17 | 2017-11-24 | 浙江师范大学 | A kind of railroad train bearing monitor system generator |
| CN107395047A (en) * | 2017-08-17 | 2017-11-24 | 浙江师范大学 | A kind of piezoelectric generator of gyromagnet radial direction tension and compression excitation |
| CN107482868A (en) * | 2017-08-17 | 2017-12-15 | 浙江师范大学 | A kind of water flow generator of magnetic coupling step-by-step excitation |
| CN112187100A (en) * | 2020-11-15 | 2021-01-05 | 浙江师范大学 | Rotary self-excitation energy harvester with shaft end suspended |
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| 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 |
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| CN101510740A (en) * | 2009-04-02 | 2009-08-19 | 吴速 | System for driving piezoelectric material to generate electricity by utilizing wind energy |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN107359815A (en) * | 2017-08-17 | 2017-11-17 | 浙江师范大学 | A kind of rotary piezoelectric generator of radial direction tension and compression excitation |
| CN107395051A (en) * | 2017-08-17 | 2017-11-24 | 浙江师范大学 | A kind of railroad train bearing monitor system generator |
| CN107395047A (en) * | 2017-08-17 | 2017-11-24 | 浙江师范大学 | A kind of piezoelectric generator of gyromagnet radial direction tension and compression excitation |
| CN107482868A (en) * | 2017-08-17 | 2017-12-15 | 浙江师范大学 | A kind of water flow generator of magnetic coupling step-by-step excitation |
| CN107359815B (en) * | 2017-08-17 | 2023-05-16 | 浙江师范大学 | Radial tension-compression excited rotary piezoelectric generator |
| CN107332463A (en) * | 2017-08-17 | 2017-11-07 | 浙江师范大学 | A kind of new type train bearing monitor system generator |
| CN107395047B (en) * | 2017-08-17 | 2023-05-16 | 浙江师范大学 | Gyromagnetic radial tension-compression excited piezoelectric generator |
| CN107482868B (en) * | 2017-08-17 | 2023-05-26 | 浙江师范大学 | Magnetic coupling step-by-step excitation water flow generator |
| CN107332463B (en) * | 2017-08-17 | 2023-05-26 | 浙江师范大学 | Novel generator for train bearing monitoring system |
| CN112187100A (en) * | 2020-11-15 | 2021-01-05 | 浙江师范大学 | Rotary self-excitation energy harvester with shaft end suspended |
| CN112187100B (en) * | 2020-11-15 | 2021-09-24 | 浙江师范大学 | Rotary self-excitation energy harvester with shaft end suspended |
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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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Free format text: CORRECT: INVENTOR; FROM: WANG SHUYUN KAN JUNWU XU HAILONG CAI JIANCHENG YIN XIAOHONG CENG PING TO: WANG BIN WANG SHUYUN KAN JUNWU CAI JIANCHENG YIN XIAOHONG ZHANG ZHONGHUA CENG PING |
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