CN103506297A - E-type electric eddy current vibration exciter - Google Patents
E-type electric eddy current vibration exciter Download PDFInfo
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- CN103506297A CN103506297A CN201210217338.3A CN201210217338A CN103506297A CN 103506297 A CN103506297 A CN 103506297A CN 201210217338 A CN201210217338 A CN 201210217338A CN 103506297 A CN103506297 A CN 103506297A
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Abstract
Provided is an E-type electric eddy current vibration exciter. According to the technical scheme, a magnetic sheet is used for providing a permanent magnetic field. The magnetic sheet covers an electric eddy current sensing head. The permanent magnetic field powerful enough can be provided, and influence on alternating flux is small. Tests show that a magnetic circuit can be successfully used for carrying out vibration excitation on a wide board. Under the situation of the same eddy current, vibration excitation force is much larger than electric eddy current magnetism push-pull vibration excitation force, and frequency is the same as the frequency of input signals.
Description
Technical field
The present invention relates to vibrator field, especially " E type " eddy-current exciter.
Background technology
Contactless exciting for conduction (non-magnetic) wide plate; generally to adopt " JCD-1 type " electric eddy-magnetic to recommend vibrator and carry out exciting; this vibrator has following several respects advantage: do not contact with test specimen, on test specimen, without additional mass and additional stiffness impact, the vibration measuring degree of accuracy is high; Wide frequency range; Noise is little; Simple in structure, working service is convenient." but JCD-1 type " electric eddy-magnetic is recommended vibrator and is adopted electric eddy-magnetic to recommend exciting force, according to galvanomagnetic-effect, the current vortex that alternating flux is responded in test specimen must produce magnetic field, and the variation of former alternating flux is always revolted in the magnetic field of current vortex generation, its phase lag 90 degree, the active force of this magnetic field and original alternating magnetic field is exactly that electric eddy-magnetic is recommended exciting force.Such exciting force has two shortcomings: the one, and the exciting force producing is little; The 2nd, the frequency of exciting force is the twice of frequency input signal.
Summary of the invention
Above-mentioned two shortcomings that exist in order to solve existing vibrator, the present invention proposes " E type " eddy-current exciter, it has exciting force in the situation that identical vortex flow (the permanent magnetic field of " E type " eddy-current exciter is 0. 2T) than electric eddy-magnetic, to recommend exciting force much bigger, and the frequency advantage consistent with the frequency of input signal.
The technical scheme that the present invention solves its technical problem employing is to adopt magnetic sheet that permanent magnetic field is provided, a magnetic sheet is covered on current vortex inductive head, enough great Heng magnetic field can be provided, again can be very not large on alternating flux impact, it is very successful that the such magnetic circuit of evidence is used for exciting wide plate.
In such scheme, the material that covers the magnetic sheet on current vortex inductive head is rubidium iron boron magnet steel.
In such scheme, on current vortex inductive head, the placement location of magnetic sheet is: the top of inductive head, both sides magnet steel is placed on the inner side on both sides.
In such scheme, the magnetic of magnetic sheet is that the magnet steel pole-face magnetic pole that exposes in both sides is identical, contrary with magnetic sheet magnetic pole on vortex induction head.
Above-mentioned " E type " eddy-current exciter is for the exciting of applicable different frequency, and winding adopts multitap form, in the number of turns, is 100,150,200,300, in the time of 500 toward outer lead.
The invention has the beneficial effects as follows in the situation that its exciting force of identical vortex flow than electric eddy-magnetic, to recommend exciting force much bigger, and frequency is consistent with the frequency of input signal.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated:
Fig. 1. magnetic sheet putting position schematic diagram;
Fig. 2. " E type " eddy-current exciter structure chart;
Fig. 3. exciting wide plate test figure;
1. magnet steel in figure, 2. sheet rubidium iron boron magnet steel, 3. vortex induction head, 4. lead-in wire.
The specific embodiment
the design of the permanent magnetic circuit of " E type " eddy-current exciter
Realize and the excitation principle of wide plate is recommended to exciting by electric eddy-magnetic change Eddy Current Excited into, will above eddy current head, add an enough large horizontal permanent magnetic field, and that the magnet that this horizontal permanent magnetic field is provided can not exceed vortex induction head is very large, because wide plate need to be put above it, if from vortex induction head too away from, alternating magnetic field will die down terribly, even if horizontal permanent magnetic field is relatively strong, exciting force also can be very little.Through constantly study experiment, find sheet rubidium iron boron magnet steel to be attached on vortex induction head and can to meet above-mentioned requirements.
Because permanent magnetic field directly affects the size of exciting force, so should obtain larger ， both sides, horizontal permanent magnetic field as far as possible, add again magnetic sheet or magnetic patch, transverse magnetic can increase.
the design of " E type " eddy-current exciter winding
The design of winding has directly determined the size of the alternating flux that vortex induction head can produce, and has indirectly determined the size of the vortex flow that wide plate can produce, and affects the size of exciting force.Therefore, adopt rational interchange winding, produce maximum alternating flux.
From electromagnetism, the size that interchange winding can produce alternating flux is directly proportional to its institute's making alive, is inversely proportional to frequency and wire circle.According to this conclusion, can show that on vortex induction head, around a turn coil, adding high voltage just can obtain very large alternating flux; in fact it is impossible that yes; this is because there are two constraintss in reality: the restriction of (1) power amplifier, and alternating voltage can not be excessive; (2) wire restriction, alternating current virtual value can not surpass a particular value.
In the situation that meeting above-mentioned condition, the winding coil number of turns is fewer, and the alternating flux that can produce on vortex induction head is larger.Under the maximum voltage that can provide at power amplifier, under different frequencies, winding current virtual value reach limits value used the number of turns be different, frequency is higher, the number of turns is fewer.For the exciting of applicable different frequency, winding adopts multitap form, in the number of turns, is 100,150,200,300, in the time of 500 toward outer lead.The structure of " E type " eddy-current exciter is as accompanying drawing 2.
Long 20 cm of aluminium sheet that are excited, wide 10 cm, thick 0. 1 cm.Yi Chang fixes with fixture on limit, and vibrator vortex induction head is put in the centre position of aluminium sheet, and vortex induction end surface is apart from aluminium sheet 0. 6 mm.Acceleration transducer is fixed on apart from 5 cm positions, minor face 5 cm，Chang limit.
Use respectively " E type " eddy-current exciter and " J CD-1 type " electric eddy-magnetic to recommend vibrator and carry out exciting, the same in order to guarantee the alternating flux that in twice exciting, vibrator vortex induction head produces, remove to replace " JCD-1 type " electric eddy-magnetic to recommend vibrator the magnet steel on the magnetic sheet on " E type " eddy-current exciter vortex induction head and both sides, vibrator through transformation, the excitation principle of recommending vibrator with " J CD-1 type " electric eddy-magnetic on excitation principle is the same, the data that record of test are as table 1, and 2.
table 1 " JCD-1 type " electric eddy-magnetic is recommended the exciting effect of vibrator
A is that 35670 dynamic signal analyzers are analyzed the numerical value that acceleration transducer signals obtains, the acceleration of corresponding 1 g of 100 mV, 1mV=1 000 μ V.
the exciting effect of table 2 " E type " eddy-current exciter
conclusion
It is effective at the exciting of double frequency that experimental result shows that " E type " eddy-current exciter is recommended vibrator in the exciting effect of an overtones band than " J CD-1 type " electric eddy-magnetic, and it is better that " E type " eddy-current exciter is recommended vibrator than " JCD-1 type " electric eddy-magnetic in to the exciting of conduction (non-magnetic) wide plate.
Claims (5)
1. " E type " eddy-current exciter, is characterized in that a magnetic sheet to cover on current vortex inductive head, and enough great Heng magnetic field can be provided, again can be very not large on alternating flux impact.
2. " E type " according to claim 1 eddy-current exciter, the material that it is characterized in that covering the magnetic sheet on current vortex inductive head is rubidium iron boron magnet steel.
3. " E type " according to claim 1 eddy-current exciter, is characterized in that the placement location of magnetic sheet on current vortex inductive head is: the top of inductive head, both sides magnet steel is placed on the inner side on both sides.
4. according to profit, require " E type " eddy-current exciter described in 1, the magnetic that it is characterized in that magnetic sheet is that the magnet steel pole-face magnetic pole that exposes in both sides is identical, contrary with magnetic sheet magnetic pole on vortex induction head.
5. " E type " according to claim 1 eddy-current exciter, is characterized in that winding adopts multitap form, in the number of turns, is 100,150,200,300 for the exciting of applicable different frequency, in the time of 500 toward outer lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210217338.3A CN103506297A (en) | 2012-06-28 | 2012-06-28 | E-type electric eddy current vibration exciter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210217338.3A CN103506297A (en) | 2012-06-28 | 2012-06-28 | E-type electric eddy current vibration exciter |
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| CN103506297A true CN103506297A (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210217338.3A Pending CN103506297A (en) | 2012-06-28 | 2012-06-28 | E-type electric eddy current vibration exciter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237617A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test device considering internal flow field and pressure influence thereof |
| CN113237618A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test method considering internal flow field and pressure influence thereof |
-
2012
- 2012-06-28 CN CN201210217338.3A patent/CN103506297A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113237617A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test device considering internal flow field and pressure influence thereof |
| CN113237618A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test method considering internal flow field and pressure influence thereof |
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Application publication date: 20140115 |