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JPH0496600

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DESCRIPTION JPH0496600
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater transmitter using a high magnetostrictive rare earth alloy, and more particularly to a
structure for applying a magnetic bias. (Conventional art) Conventionally, as a technique in such
a field, for example, reference J, Acoust, Soc, Am, 72 [2] (1982-8> 'Rare-earthiron'5quare
ring'dip'. There is a technique described in le transducer Jp, 313-315. The configuration will be
described below with reference to FIGS. 2 and 3. FIG. 2 is a plan view showing a configuration
example of a conventional underwater wave transmitter using a rare earth alloy, and FIG. 3 is a
circuit diagram of a drive circuit of the underwater wave transmitter of FIG. is there. This
underwater wave transmitter (hereinafter referred to as a wave transmitter) 10 has a wave
transmitter body 11, and cylindrical bobbins 12a, 12b, 12c and 12d are square on the upper
surface of the wave transmitter body 11. Are arranged in a shape. ボビン12a〜12dには、
コイル13a、13b。 13c and 13d are wound, and the coils 13a to 13d are connected to the
terminals 14 and 15.16. Further, magnetostrictive rods 17a, 17b, 17c and 17d made of high
magnetostrictive rare earth alloys are inserted into the bobbins 12a to 12d, and masses 18a,
18b, 18c and 18d are inserted in the magnetostrictive rods 17a to 17d. It is attached. When
driving the transmitter 10, for example, a drive circuit as shown in FIG. 3 is configured. In the
drive circuit of FIG. 3, resonance systems 19a and 19b illustrate resonance systems constituted
isometrically by coils 13a to 13d, magnetostrictive rods 17a to 17d, masses 18a to 18d, etc. The
circuit includes an AC blocking choke coil 20, a DC power supply 21, an AC power supply
terminal 22.23, and a DC separation capacitor 24.25. Here, the choke coil 20 and the DC power
supply 21 are for applying a magnetic bias to the magnetostrictive rods 17a to 17d in order to
produce an effective magnetostrictive action on the magnetostrictive rods 17a to 17d and obtain
an optimal drive output. is there. The terminals 22 and 23 are for supplying AC power to the
coils 13a to 13d via a power amplifier or the like (not shown), and the capacitor 24.25 functions
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as a DC separation circuit. Next, the operation of the transmitter 10 will be described. After the
transmitter 10 is appropriately waterproofed, it is put in water, and when a direct current is
supplied from the DC power supply 21 to the coils 13a to 13d through the choke coil 20, a
magnetic bias is applied to the magnetostrictive rods 17a to 17d. Ru.
Furthermore, when an alternating current is superimposed on the coils 13a to 13d from the
terminal 22.23 through the capacitor 24.25, an alternating magnetic field is generated by the
coils 13a to 13d, and the magnetostrictive rods 17a to 17d cause expansion and contraction
vibrations. Then, the masses 18a to 18d vibrate in accordance with the vibrations of the
magnetostrictive rods 17a to 17d, whereby sound waves (such as ultrasonic waves) are
generated and the sound waves propagate in water. In this transmitter 10, since a high
magnetostrictive rare earth alloy is used for the magnetostrictive rods 17a to 17d, there is an
advantage that a high magnetostrictive effect can be obtained. (Problems to be Solved by the
Invention) However, the transmitter 10 having the above configuration has the following
problems. (2) In the wave transmitter 10, a rare earth alloy is used for the magnetostrictive rods
17a to 17d, and the magnetic bias of this kind of rare earth alloy usually requires about 200 to
500 elsteds (Oe). The amount of DC current increases, and heat is generated in the coils 13a to
13d. Therefore, in the conventional transmitter 10, it is necessary to provide a cooling device,
and there is a problem that the entire device becomes large and complicated. In addition, heat is
generated in the coils 13a to 13d, so that the electric energy of the DC power supply 21 is not
converted to the magnetic energy for the magnetic bias and is converted to thermal energy to
cause energy loss, and further, the coils 13a to 13d Heat generation at 13 d causes the
generation of an extra mode and the like, and an AC magnetic field is not efficiently applied to
the magnetostrictive rods 17 a to 17 d, which also causes energy loss. In the wave transmission
device 10, in order to apply a magnetic bias to the magnetostrictive rods 17a to 17d, it is
necessary to provide a DC separation circuit consisting of a capacitor 24.25, a choke coil 20, etc.
I will. SUMMARY OF THE INVENTION The present invention solves the problems of the prior art
in that energy loss occurs due to heat generation of the coil, the device is enlarged, and the
electric circuit is complicated, and the size, weight and height are high. An underwater wave
transmitter using a rare earth alloy which can be output. (Means for Solving the Problems) In the
first invention, in order to solve the above-mentioned problems, a magnetostrictive rod formed
using a high magnetostrictive rare earth alloy, and an AC wire wound around the periphery of
the magnetostrictive rod and supplied with power. A magnetic bias is applied to a coil for
generating a magnetic field to cause distortion in the magnetostrictive rod, a permanent magnet
surrounding the side of the magnetostrictive rod and forming a magnetic circuit with the
magnetostrictive rod, and a yoke material An underwater wave transmitter is configured by using
a magnetic bias applying unit and a vibrator directly attached to the end face of the
magnetostrictive rod and vibrating according to the strain of the magnetostrictive rod.
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According to a second invention, in the first invention, the magnetic bias applying unit is
configured by a plurality of permanent magnets located near both ends of the magnetostrictive
rod and on the side of the magnetostrictive rod. According to a third invention, in the first
invention, the magnetic bias applying unit includes two permanent magnets respectively attached
to both end surfaces of the magnetostrictive rod, and the vibrator is attached to the permanent
magnet. Are constructed. According to a fourth invention, in the first invention, the permanent
magnet has a coercive force of 3 [KOe] or more according to the magnetic permeability of the
magnetostrictive rod, and the yoke material has a magnetic permeability of 20 (CGS non (Rimetic
system) or more, and has a configuration in which the resistivity is 1 [μΩ-cm] or more, and the
effective saturation magnetic flux density is 1 [KG] or more. According to the first aspect of the
present invention, since the underwater transmitter is constituted by the magnetostrictive rod,
the coil, the magnetic bias application unit, and the vibrator, the coil generates an alternating
magnetic field, for example, by the supply of an AC power supply. Work as it is. The
magnetostrictive rod causes distortion due to an alternating magnetic field generated by the coil,
and works to expand and contract (drive) in the axial direction. The magnetic bias application
unit comprising the permanent magnet and the yoke material forms a magnetic circuit together
with the magnetostrictive rod to apply a magnetic bias to the magnetostrictive rod, and further, a
return (return path of the AC magnetic field generated by the coil) Act as The vibrator vibrates
according to the strain of the magnetostrictive rod, but since the magnetic bias applying unit is
disposed on the side of the magnetostrictive rod, it is directly attached to the end face of the
magnetostrictive rod and the magnetostrictive rod is driven. It propagates directly and vibrates.
According to the second and third inventions, each of the magnetic bias applying units applies a
magnetic bias to the strain rod by a magnetic field generated between the plurality of permanent
magnets and the two permanent magnets. work. In particular, in the second invention, since the
plurality of permanent magnets are disposed on the side of the magnetostrictive rod, the vibrator
is directly attached to the magnetostrictive rod, and the drive of the magnetostrictive rod is
directly transmitted to the vibrator. Do. According to the fourth invention, it works to realize the
optimization of the design of the underwater wave transmitter in the first invention. Therefore,
the problem can be solved. (Embodiment) FIG. 1 is a schematic cross-sectional view schematically
showing the structure of an underwater wave transmitter using a rare earth alloy according to a
first embodiment of the present invention. The transmitter 30 includes a magnetostrictive rod 31
formed of, for example, a high magnetostrictive rare earth alloy made of terbium dysprosium
iron (TbDyFe).
On both end surfaces of the magnetostrictive rod 31, a mass 32 ° 33, which is a vibrating body
and made of, for example, brass etc., is directly attached. A cylindrical cylindrical bobbin 34 is
disposed on the outer periphery of the magnetostrictive rod 31, and a coil 35 such as a solenoid
coil is wound around the bobbin 34. Further, on the outside of the bobbin 34 between the
masses 32 and 33, for example, a magnetic bias applying unit 36 having a substantially
cylindrical structure centering on the magnetostrictive rod 31 is disposed. The magnetic bias
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application unit 36 is for forming a magnetic circuit and applying a magnetic bias to the
magnetostrictive rod 31, and, for example, two ring-shaped permanent magnets 37 appropriately
set in polarity, a yoke material, and a cylinder A plurality of soft and toroidal soft ferrites 38 are
stacked. Here, the permanent magnet 37 is formed of, for example, a strong magnet having a
coercive force of 3 [KOe] or more, and is configured such that the length viewed in the cross
section of FIG. The soft ferrite 38 has, for example, high permeability of 20 or more (CGS nonrational system), high resistivity of 1 [μΩ-cm] or more, and performance of effective saturation
magnetic flux density of 1 [KG] or more. I use the one. In the transmitter 30, for example, the coil
35 is connected to a drive circuit including a power amplifier (not shown) and the like, and is
configured to be supplied with AC power. Next, the operation of the transmitter 30 will be
described. In the wave transmitter 30, the magnetostrictive rod 31 is inserted at the center of the
magnetic circuit consisting of the permanent magnet 37 and the soft ferrite 38 of the magnetic
bias application unit 36, and thus the permanent magnet 37, the soft ferrite 38 and the
magnetostrictive rod 31 A closed magnetic circuit is formed. As a result, a strong magnetic flux
flows in the magnetostrictive rod 31, and a magnetic bias is applied to the magnetostrictive rod
31. Furthermore, when an alternating current flows through the coil 35, an alternating magnetic
field is generated around the coil 35, and the alternating magnetic field is efficiently applied to
the magnetostrictive rod 31 by passing through a magnetic circuit including the magnetic bias
application unit 36. . Then, distortion occurs in the magnetostrictive rod 31, and the distortion
changes according to the alternating magnetic field, thereby causing the magnetostrictive rod 31
to vibrate in extension and contraction in the axial direction (drive axis direction). When the
magnetostrictive rod 31 vibrates in the axial direction, the mass 32 ° 33 vibrates in the axial
direction accordingly. Therefore, if the transmitter 30 is waterproofed and the transmitter 30 is
put in water, sound waves (ultrasound etc.) can be generated in the water by the vibration of the
mass 32.33.
The first embodiment has the following advantages. (A) In the transmitter 30, in order to apply a
magnetic bias to the magnetostrictive rod 31, the magnetism of the permanent magnet 37 is
used. In general, there are various methods of using a magnet to apply a magnetic bias to the
magnetostrictive rod 31. For example, when the permeability of a high magnetostrictive rare
earth alloy is very low, a high magnetic field can be applied to the magnetostrictive rod 31-. Is
very difficult to obtain, and it is difficult to obtain a sufficient amount of magnetic bias. However,
in the present embodiment, a permanent magnet 37 surrounding the side surface side of the
magnetostrictive rod 31 and a magnetic bias application unit 36 formed of soft ferrite 38 are
provided, and the magnetostrictive rod 31 is inserted into the magnetic bias application unit 36.
A closed magnetic circuit consisting of the magnet 37, the soft ferrite 38 and the
magnetostrictive rod 31 is not formed. The magnetic field generated by the permanent magnet
37 can be efficiently applied to the magnetostrictive rod 31 so that a strong magnetic flux can
flow through the magnetostrictive rod 31. Therefore, in the transmitter 30, a magnetic bias
amount sufficient to drive the magnetostrictive rod 31 can be obtained. (B> In the transmitter 30,
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the magnetic bias is applied to the magnetostrictive rod 31 by the magnetic bias application unit
36 including the permanent magnet 37 and the soft ferrite 38. Therefore, the magnetic bias is
applied to the coil 35 as in the conventional case. No heat generation occurs due to the
application of the above, energy loss due to heat generation is eliminated, and the necessary
amount of magnetic bias can be efficiently obtained. (C) In the transmitter 30, the magnetic bias
is applied by the magnetic bias application unit 36. Therefore, a cooling device is provided as in
the prior art, or a choke coil for AC power cutoff or DC isolation is used in the drive circuit. It is
not necessary to provide a capacitor or the like which is a circuit, and the size and weight of the
device can be reduced. (D> In the case of using a resonant system (Lange bang method) in which
the magnetostrictive rod 31 driven in the axial direction is used as a drive element and a mass
32. 33 is attached to both ends as in this embodiment, the end face of the magnetostrictive rod
31 is Large compressive and tensile loads occur. Therefore, if one such as a permanent magnet
or ferrite is sandwiched between the magnetostrictive rod 31 which is a drive element and the
mass 32.33, the loss of drive output increases and the efficiency of drive decreases, but the wave
transmitter At 30, since the magnetic bias application unit 36 applies the magnetic field to the
magnetostrictive rod 31 from the side of the magnetostrictive rod 31, the mass 32. 33 can be
attached directly to the end face of the magnetostrictive rod 31, and the driving of the
magnetostrictive rod 31 is performed. Can be efficiently transmitted as it is to the mass 32.33,
and the loss of drive output can be eliminated.
(E) In the wave transmitter 30, the strength of the magnetic field and magnetic flux by the
magnetic bias application unit 36 can be freely selected by setting the shape of the permanent
magnet 37 and the soft ferrite 38 by the area, length, etc. Can be (F) The magnetic bias
application unit 36 is configured using the soft ferrite 38, and since the soft ferrite 38 has a large
resistivity and permeability, the eddy current is generated by increasing the resistivity. Can be
prevented, and the magnetic field can be easily passed by increasing the permeability. (G) In the
present embodiment, since the permanent magnet 37 has a thinner shape by shortening the
length seen in the cross section of FIG. 1 as compared with the soft ferrite 38, the low magnetic
permeability portion in the magnetic bias applying section 36 is reduced. Can easily pass the
magnetic field. FIG. 4 is a schematic cross-sectional view schematically showing a configuration
of a submersible wave transmitter using a rare earth alloy according to a second embodiment of
the present invention. In the figure, elements common to those in FIG. 1 are given the same
reference numerals. The wave transmitter 40 includes a magnetostrictive rod 31 configured
similarly to the wave transmitter 30, masses 32, 33, a bobbin 34, and a coil 35, and also includes
a magnetic bias application unit 41. The magnetic bias application unit 41 has a doughnutshaped permanent magnet 42.43 disposed near both ends of the magnetostrictive rod 31 and on
the side of the magnetostrictive rod 31, and the permanent magnet 42.43 is, for example, a
cylinder. It is supported at a predetermined interval by a support member 44 such as a bar or
rod. In the second embodiment, by appropriately setting the polarity of the permanent magnet
42.43, a magnetic field is generated between the permanent magnets 42 and 43, and a magnetic
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flux flows through the magnetostrictive rod 31, so that a magnetic bias is applied. Further, in
substantially the same manner as in the first embodiment, when, for example, an alternating
current is supplied to the coil 35, the magnetostrictive rod 31 is driven to vibrate the mass 32.
33 to generate a sound wave (ultrasonic wave or the like). it can. In this second embodiment, the
same advantages (B), (C) and (D) as the first embodiment can be obtained. Furthermore, in the
present embodiment, the following advantages can be obtained. That is, when the drive
displacement by the magnetostrictive rod 31 is increased, it is necessary to increase the length in
the drive axis direction of the magnetostrictive rod 31. However, in the present embodiment, the
length of the magnetostrictive rod 31 is increased to increase the length in the drive axis
direction. If the coercivity of the permanent magnet 42.43 is appropriately set and the
permanent magnet 42.degree. 43 has a thickness, a strong magnetic force can be obtained even
if the distance between the permanent magnets 42 and 43 is increased. A sufficient amount of
magnetic bias can be obtained.
Therefore, in the wave transmitter 40, the magnetostrictive rod 31 can be easily made longer
without deteriorating the amount of magnetic bias, and the drive displacement can be obtained,
and the output of the drive output can be increased. Moreover, in the second embodiment, the
cost is increased as compared with the case where the axial length of the permanent magnet 37
and the soft ferrite 38 is increased in order to lengthen the magnetostrictive rod 31 in the first
embodiment. It can be kept low. FIG. 5 is a schematic cross-sectional view schematically showing
the structure of an underwater wave transmitter using a rare earth alloy according to a third
embodiment of the present invention. In FIG. 5, the same elements as in FIG. The same symbol is
attached. The transmitter 50 includes a magnetostrictive rod 31 similar to the transmitter 30, a
mass 32.33, a bobbin 34, and a coil 35, and also includes a magnetic bias application unit 51.
The magnetic bias application unit 51 is configured of a cylindrical permanent magnet 52.53
directly attached to both end surfaces of the magnetostrictive rod 31 and appropriately set in
polarity. Further, unlike the case of the transmitter 30, the masses 32. 33 in the transmitter 50
are respectively attached to the permanent magnets 52 ° 53. In the third embodiment, a
magnetic flux flows in the magnetostrictive rod 31 by the magnetic field between the permanent
magnets 52 and 53 in substantially the same manner as in the second embodiment, so that
application of a magnetic bias is performed, and an alternating current is caused to flow in the
coil 35. As a result, the magnetostrictive rod 31 is driven to vibrate the mass 32.33 through the
permanent magnet 52.53 so that a sound wave (such as an ultrasonic wave) can be generated. In
the third embodiment, the same advantages (B) and (C) as in the first embodiment can be
obtained, and a transmitter is used when loss of drive output by the permanent magnet 52.53
causes no problem. The advantage is obtained that the 50 structures can be simplified. The
present invention is not limited to the illustrated embodiment, and various modifications are
possible. For example, the following may be mentioned as a modification. (I) The structure of the
transmitters 30 and 40.50 can be variously modified. {Circle over (3)} For example, the
magnetostrictive rod 31 may be formed using a high magnetostrictive rare earth alloy other than
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TaDyFe, and its shape can also be deformed. Also, the magnetostrictive rod 31 is made of-but, for
example, two, and accordingly the shape of the bobbin 34 and the solenoid coil 35 is made to be,
for example, a figure of eight in cross section. Modifications such as inserting two
magnetostrictive rods into each inner part are also possible. {Circle over (2)} The magnetic bias
applying section 36 can be modified in shape, number, etc. of the permanent magnet 37 and the
soft ferrite 38, for example, and the entire structure does not necessarily have to be a cylindrical
structure.
Furthermore, the characteristics of the permanent magnet 37 and the soft ferrite 38 can be
changed. For example, when a high permeability magnetostrictive material is used as the
magnetostrictive rod 31, the coercive force of the permanent magnet 37 is smaller than 3 [KOe].
Also, substantially the same action and effect as the first embodiment can be obtained. Although
the soft bias 38 is used as the yoke material for the magnetic bias application section 36, it may
be made of another material. {Circle over (2)} The magnetic bias applying section 41.51 can be
modified in shape, arrangement, number and the like of the permanent magnets 42.43 and
52.53. Further, the support member 44 can be modified in its configuration, and is not
necessarily provided if fixation of the permanent magnet 42.43 can be achieved by other means.
{Circle over (3)} The shape, number, and mounting of the mass 32.33 can be changed, such as
the position. (II) The structures of the transmitters 30 and 40.50 are schematically and
conceptually illustrated in FIGS. 1, 4 and 5, but the mounting structure of the transmitters 30 and
40.50 is Various modifications are possible. For example, the transmitter may be configured by
combining a plurality of transmitters 30.40.50 like the transmitter 10, and the transmitter body,
the structure for waterproofing, the drive circuit, etc. are illustrated. Although not included, it is
added appropriately according to the design. (Effects of the Invention) As described above in
detail, according to the first invention, the magnetic bias is applied to the magnetostrictive rod by
the magnetic bias applying unit, so that the energy resulting from the application of the magnetic
bias is obtained. The loss can be eliminated, the energy efficiency of the underwater wave
transmitter can be improved, and the size and weight of the whole underwater wave transmitter
can be reduced. Furthermore, the magnetic bias application unit forms a closed magnetic circuit
together with the magnetostrictive rod and functions as a return of an alternating magnetic field
so that an alternating magnetic field generated in the coil can be efficiently applied to the
magnetostrictive rod, which is efficient Magnetic bias can be applied, and the magnetostrictive
rod can be effectively driven. Further, since the vibrator is directly attached to the
magnetostrictive rod, the drive of the magnetostrictive rod can be efficiently transmitted as it is
to the vibrator, and the loss of the drive output of the underwater wave transmitter can be
eliminated. Therefore, it is possible to realize an underwater wave transmission device which is
excellent in energy efficiency, can be reduced in size and weight, and can increase the drive
output. According to the second invention, substantially the same effect as in the first invention is
obtained, and the magnetic bias applying unit is provided with a plurality of permanent magnets
located near both ends of the magnetostrictive rod and on the side of the magnetostrictive rod.
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Since the thickness, the coercive force, and the like of the plurality of permanent magnets are
appropriately set, it is possible to make the magnetostrictive rod longer and to apply a sufficient
magnetic bias even in that case.
Therefore, the drive displacement of the magnetostrictive rod can be easily obtained at low cost,
and the output of the drive output of the underwater wave transmitter can be increased.
According to the third invention, the energy loss due to the application of the magnetic bias can
be removed as in the first invention, and the energy efficiency of the underwater transmitter can
be improved, and the whole underwater transmitter can be obtained. Miniaturization and weight
reduction can be achieved. Further, by appropriately setting the thickness, the coercivity and the
like of the two permanent magnets, it is possible to make the magnetostrictive rod longer in
length, and in this case, sufficient magnetic bias can be applied. Furthermore, the structure of the
underwater wave transmitter can be simplified when the loss of drive power due to the two
permanent magnets is not a problem. According to the fourth invention, the effects of the first
invention can be optimized.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic cross-sectional view of a submersible wave transmitter using a rare earth
alloy according to a first embodiment of the present invention, and FIG. 2 is a schematic plan
view of a submersible wave transmitter using a conventional rare earth alloy. FIG. 3 is a circuit
diagram of the drive circuit of the underwater wave transmitter shown in FIG. 2. FIG. 4 is a
schematic diagram of a water wave transmitter using a rare earth alloy according to a second
embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of an underwater
wave transmitter using a rare earth alloy according to a third embodiment of the present
invention.
30.40.50 · · · Underwater wave transmitter, 31 · · · Magnetostrictive rod, 32. 33 · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · 34, 41. 51 ... magnetic Bias application unit, 37, 42.43, 52.53 ... permanent
magnet, 38 ... soft ferrite.
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