CN205008212U - Inertial -type vibration exciter of twin coil single action magnet structure based on heat dissipation of magnetic current body - Google Patents

Abstract

The utility model provides an inertial -type vibration exciter of twin coil single action magnet structure based on heat dissipation of magnetic current body, include: move magnet (1), last coil (13), lower coil (14), leaf spring, shell (2) and the magnetic current body (20), it is the annular tubular structure that the symmetry set up to move magnet (1) both ends for move magnetic field along the pipe wall constitution return circuit that magnet (1) produced, last coil (13) and down coil (14) symmetry lie in two rings shape hole (23), when two coils let in reverse alternating current after, should go up coil (13), down coil (14) with move the electromagnetic excitation power that will produce the syntropy between magnet (1), make and move magnet (1) and shell (2) and produce the excitation that relative motion formation is vibrated within a definite time, the magnetic current body (20) fill in looping pit (23) for the heat conduction that will go up coil (13) and coil (14) production down dispels the heat on moving magnet (1), thereby strengthens the heat dispersion of inertial -type vibration exciter.

Description

Based on the inertial exciter of the twin coil single action magnet structure of magnetic fluid heat radiation

Technical field

The utility model relates to mechanical vibration technology field, particularly based on the inertial exciter of the twin coil single action magnet structure of magnetic fluid heat radiation.

Background technology

Vibration exciter (being called for short vibrator, also known as actuator) is a kind of is the vibration excitation device of mechanical energy by electric energy conversion, under the driving of input signal, produces the vibration of expection with the mode incentives target of power output.Along with technological progress, in every field such as scientific research, military affairs, automobile, amusements, along with the demand of people to vibration generation or control is day by day strong, the application of vibrator is also more and more extensive.

According to the difference of energy transducer, vibrator can be divided into the kinds such as electromagnetic type, piezoelectric type, magnetostriction type, fluid pressure type.Wherein piezoelectric type, self mechanical impedance of magnetostriction type vibrator are comparatively large, Admissible displacement is lower, is generally suitable for the exciting of high frequency; Fluid pressure type vibrator needs additional external hydraulic system, complex structure and Admissible displacement is lower, but force value is larger; And electromagnetic actuator additional impedance is little, Admissible displacement large, it is the general selection of demand low frequency exciting occasion.

According to the difference of structure and mounting means, vibrator can be divided into common vibrator and inertial exciter again.Common vibrator is generally made up of base and power output, respectively base and power output to be fixed during installation, its mounting structure is complicated and higher to installation accuracy requirement, but power output additional impedance is very little, and vibrator lower limit operating frequency is lower, is generally applied to the occasion of the demand precision measurements such as scientific research.Different from common vibrator, there is not power output in inertial exciter, only needs can normally work fixing for base, thus install simple and easy, application is more extensive, but its lower limit operating frequency is generally higher than common vibrator.

Along with the growth of vibrator application demand, people have higher requirement to its performance indications.The power fan-out capability how improving vibrator under the condition not increasing volume, weight is the main purpose of current vibrator design.Increasing coil current is the most direct method, but now coil thermal power increases equally, and this has higher requirement to the heat dispersion of vibrator.At present, in most vibrator, be connected by the material that the heat conductivilitys such as glue, bakelite shell fragment are not good between coil with shell, and contact area is little, the heat that coil produces is difficult to effectively conduct on shell, thus makes coil easy heat accumulation amount under big current produce high temperature.Therefore, the major issue how improving the heat dispersion of effective vibrator, suppress the temperature of coil to be vibrator design, can directly promote its fan-out capability.

Utility model content

The purpose of this utility model is, for solving the shortcoming that existing vibrator heat dispersion is poor, energy density is low, mounting structure is complicated, a kind of inertial exciter of the twin coil single action magnet structure adopting magnetic fluid to dispel the heat is provided, utilize this inertial exciter can strengthen the heat dispersion of vibrator, improve life-span of coil, improve that it is long-time, the reliability of high power work.

For achieving the above object, the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation that the utility model provides, comprising: dynamic magnet, shell, leaf spring, upper coil lower coil and magnetic fluid.Described leaf spring is annulus tabular elastic construction, for magnet support will be moved in shell, and limit the non axial displacement of braking magnet, the circular tube structure that the two ends of described dynamic magnet are symmetrical set, the magnetic field that dynamic magnet is produced annularly tubular structure tube wall form loop, the end face outside of each circular tube structure is equipped with a looping pit, for placing coil, described looping pit by the inner chamber of circular tube structure and the external world through, described upper coil and lower coil are all wrapped on a coil rack, the center be fixed on inside shell both ends of the surface of the other end symmetry of two coil racks, described upper coil and lower coil symmetry be positioned at two looping pits, after two coils pass into reverse alternating current, coil on this, electromagnetic excitation power in the same way will be produced between lower coil and dynamic magnet, make between magnet and shell, to produce the excitation that relative motion forms vibration, described magnetic fluid is poured in looping pit, heat conduction for upper coil and lower coil being produced dispels the heat to dynamic magnet.

As the further improvement of technique scheme, described shell comprises: upper cover plate, lower cover and housing, and described upper cover plate and lower cover are covered in upper port and the lower port of housing respectively; The middle part of this upper cover plate and lower cover is equipped with an annular flange flange, is respectively used to the fixing upper coil rack of coil, the coil rack of lower coil.

As the further improvement of technique scheme, described shell also comprises heat abstractor, this heat abstractor comprises: centrifugal blower, some upper fin and some lower fin, described upper fin and lower fin are individually fixed in the top of upper cover plate and the bottom of lower cover, the center of two annular flange flange of described upper cover plate and lower cover all offers the hole through with the inner chamber of iron core, as the entrance and exit of air flowing, described centrifugal blower is arranged at directly over upper cover plate, it flows into inertial exciter by electrical energy drive air-flow from lower fin, and through lower cover, the inner chamber of iron core, inertial exciter is flowed out from upper fin after upper cover plate.

As the further improvement of technique scheme, around the spiral hole being distributed in upper cover plate of described upper fin, around the described lower fin hole being distributed in lower cover radially.

As the further improvement of technique scheme, described dynamic magnet comprises: iron core, upper permanent magnet, lower permanent magnet, upper yoke, lower yoke; Described iron core is the tubular structure of hollow, the outer wall of its upper/lower terminal is equipped with a ring support, circumferentially offers annular groove between two ring supports; Described upper permanent magnet is installed between a ring support and upper yoke, forms a circular tube structure after making iron core upper end, upper permanent magnet and the combination of upper yoke; Described lower permanent magnet is fixed between another ring support and lower yoke, forms another circular tube structure after making iron core lower end, lower permanent magnet and lower yoke combination.

As the further improvement of technique scheme, the gap be provided with between the outer wall of described iron core upper end and upper yoke forms a looping pit, and the gap be provided with between the outer wall of this iron core lower end and lower yoke forms another looping pit.Now go up coil, the main body of lower coil lays respectively in the magnetic gap formed by upper yoke and iron core, lower yoke and iron core.

As the further improvement of technique scheme, the quantity of described leaf spring is two; Two described leaf springs are annulus tabular elastic construction, for the weight of a racking magnet, the outer rim of one of them leaf spring is fixed between upper cover plate and housing, its inner rim is then fixed on the outer wall of yoke, the outer rim of another leaf spring is fixed between lower cover and housing, and its inner rim is fixed on the outer wall of lower yoke.Two leaf springs are fixed on housing by the flange that described upper cover plate and lower cover are all arranged by its edge.

As the further improvement of technique scheme, described upper permanent magnet, lower permanent magnet polarize vertically, and utilize glue and iron core and upper yoke, lower yoke fixes, and be installed on its relative one side after on iron core there is identical polarity.

As the further improvement of technique scheme, described iron core, upper yoke, lower yoke all utilize soft magnetic materials overall processing shaping.

As the further improvement of technique scheme, described upper permanent magnet, lower permanent magnet all utilize permanent-magnet material overall processing to circularize structure, or adopt permanent-magnet material to be processed into some sector structures, and are spliced into annulus.

The inertial exciter advantage of the twin coil single action magnet structure based on magnetic fluid heat radiation of the present utility model is:

The utility model inertial exciter is by being poured in looping pit by magnetic fluid, the heat conduction that coil and lower coil are produced dispels the heat to dynamic magnet, the heat that coil is produced effectively can conduct to the external world, improve the heat dispersion of vibrator, reduce coil temperature, and due to magnetic fluid damping characteristic good, make the power curve of output of vibrator more level and smooth, improve that it is high-power, the reliability of long-term work; The two ends of dynamic magnet are arranged tubular structure ringwise, the magnetic field that dynamic magnet is produced annularly tubular structure tube wall form loop, the magnetic field overwhelming majority is made to be constrained in this loop inner, thus the magnetic field greatly strengthened in looping pit, hot-wire coil is made to produce stronger power, the two coil configuration be equipped with, makes vibrator under same volume, weight, have higher power fan-out capability, can encourage stronger vibration; This inertial exciter can work under any setting angle simultaneously, improves the scope of application.

Accompanying drawing explanation

Fig. 1 is the cross section view of the inertial exciter of a kind of twin coil single action magnet structure based on magnetic fluid heat radiation in the utility model embodiment.

Fig. 2 is the horizontal sectional views of the upper fin in the utility model embodiment.

Fig. 3 is the horizontal sectional views of the lower fin in the utility model embodiment.

Accompanying drawing identifies:

1, dynamic magnet 2, shell 3, iron core

4, upper permanent magnet 5, lower permanent magnet 6, upper yoke

7, lower yoke 8, upper leaf spring 9, lower leaf spring

10, upper cover plate 11, lower cover 12, housing

13, upper coil 14, lower coil 15, upper fin

16, lower fin 17, centrifugal blower 18, shield

19, base plate 20, magnetic fluid 21, coil rack

22, annular flange flange 23, looping pit 24, annular groove

25, ring support

Detailed description of the invention

Be described in detail below in conjunction with the inertial exciter of drawings and Examples to the twin coil single action magnet structure based on magnetic fluid heat radiation described in the utility model.

With reference to figure 1, the inertial exciter of a kind of twin coil single action magnet structure based on magnetic fluid heat radiation that the utility model provides comprises: dynamic magnet 1, shell 2, upper leaf spring 8, lower leaf spring 9, upper coil 13, lower coil 14 and magnetic fluid 20.Described upper leaf spring 8 and lower leaf spring 9 are all in annulus tabular elastic construction, for dynamic magnet 1 is supported in shell 2, and limit the non axial displacement of braking magnet 1, the circular tube structure that the two ends of described dynamic magnet 1 are symmetrical set, the magnetic field that dynamic magnet 1 is produced annularly tubular structure tube wall form loop, the end face outside of each circular tube structure is equipped with a looping pit 23, for placing coil, described looping pit 23 by the inner chamber of circular tube structure and the external world through, described upper coil 13 and lower coil 14 are all wrapped in one end of a coil rack 21, the center be fixed on inside shell 2 both ends of the surface of the other end symmetry of two coil racks 21, described upper coil 13 and lower coil 14 symmetry be positioned at two looping pits 23, after two coils pass into reverse alternating current, coil 13 on this, electromagnetic excitation power in the same way will be produced between lower coil 14 and dynamic magnet 1, make between magnet 1 and shell 2, to produce the excitation that relative motion forms vibration, described magnetic fluid 20 is poured in looping pit 23, heat conduction for upper coil 13 and lower coil 14 being produced dispels the heat to dynamic magnet 1.Described upper coil 13, lower coil 14 pass to reversing the current, and cascade or parallel way can be adopted to utilize circumferential work to put row cutting into.

Based on the inertial exciter of said structure, as shown in Figure 1, in the present embodiment, described dynamic magnet 1 comprises: iron core 3, upper permanent magnet 4, lower permanent magnet 5, upper yoke 6, lower yoke 7; Described iron core 3 is the shaping special rotation body structures of time processing, it tubular structure comprising central authorities and two ring supports 25 arranged on the outer wall of this iron core upper/lower terminal; Described upper permanent magnet 4, lower permanent magnet 5 body all can be designed to circular ring structure, are installed on above-mentioned two ring supports 25 respectively; Described upper yoke 6 and lower yoke 7 are special circulus, are installed on respectively on permanent magnet 4 and lower permanent magnet 5.In the present embodiment, described dynamic magnet 1 can combine bonding forming by iron core 3, upper permanent magnet 4, lower permanent magnet 5, upper yoke 6, lower yoke 7, iron core 3 upper end, upper permanent magnet 4 and upper yoke 6 is made to combine rear formation circular tube structure, iron core 3 lower end, lower permanent magnet 5 and lower yoke 7 combine another circular tube structure of rear formation, and the magnetic field produced for dynamic magnet 1 provides magnetic circuit transmission medium.The one side that described upper permanent magnet 4, lower permanent magnet 5 are relative should have identical polarity, if opposite polarity, then originally two independently closed magnetic circuit can produce coupling, can the magnetic line of force be there is between upper and lower permanent magnet 5, affect the magnetic induction intensity at coil place.In addition, between two ring supports 25, circumferentially can offer annular groove 24, two annulus lines are separated, mutually disturb to avoid the magnetic field in two circular tube structure.The gap be provided with between the outer wall of described iron core 3 upper end and upper yoke 6 forms a looping pit 23, the gap be provided with between the outer wall of this iron core 3 lower end and lower yoke 7 forms another looping pit 23, now goes up coil 13, the main body of lower coil 14 lays respectively in the magnetic gap formed by upper yoke 6 and iron core 3 upper end, lower yoke 7 and iron core lower end.By on pour into magnetic fluid 20 in the magnetic gap that formed of yoke 6, lower yoke 7 and iron core 3, this magnetic fluid 20 will be tied in above-mentioned magnetic gap by magnetic fields.Now go up coil 13, lower coil 14 is contacted with dynamic magnet 1 by the magnetic fluid 20 with better heat conductivility, its heat produced will conduct on dynamic magnet 1 very soon, reduces coil temperature, and by the air of flowing, heat is passed to the external world.Therefore, described magnetic fluid 20 contributes to the heat dispersion significantly improving vibrator entirety, and the temperature of upper coil 13, lower coil 14 will be reduced.Meanwhile, the viscosity due to magnetic fluid 20 adds the damping of vibrator, makes its output characteristics more level and smooth.

In the present embodiment, described upper permanent magnet 4, lower permanent magnet 5 can utilize permanent-magnet material overall processing structure circlewise, in other embodiments, also may be partitioned into some scallop and divide and carry out processing and fabricating, and be spliced into overall annulus when mounted.Described iron core, upper yoke, lower yoke all utilize soft magnetic materials overall processing shaping.Because the two poles of the earth of permanent magnet all contact with soft magnetic materials, the magnetic field overwhelming majority that it is produced is constrained in the loop inner be made up of soft magnetic materials, thus greatly strengthens the magnetic field in looping pit, makes hot-wire coil produce stronger power.

Described shell 2 can comprise: upper cover plate 10, lower cover 11 and housing 12; Described upper cover plate 10, lower cover 11 all can be designed to circular plate-like shape structure, and this upper cover plate 10 and lower cover 11 are covered in upper port and the lower port of housing 12 respectively, are equipped with annular flange flange 22 in the middle part of it; Upper cover plate 10, lower cover 11 are positioned at the coil rack 21 that annular flange flange 22 is respectively used to fixing upper coil 13, lower coil 14 is wound around at middle part, and this coil rack 21 can utilize that glue is adhered to upper cover plate 10, lower cover 11 is positioned in the annular flange flange 22 at middle part.Each parts of shell 2 can be processed by lightweight metal material, to alleviate the overall weight of vibrator further.

Based on the inertial exciter of said structure, as shown in Figure 1, described shell also comprises heat abstractor, this heat abstractor comprises: centrifugal blower 17, some upper fin 15, some lower fin 16, fin 15 and lower fin 16 structure all in the form of sheets on this, this laminated structure is along the circumferential direction uniformly distributed in an annular region, and the external diameter of above-mentioned annular region can be identical with upper cover plate 10, lower cover 11, and internal diameter is then slightly larger than centrifugal blower 17.

In the present embodiment, described upper fin 15, its side of lower fin 16 are arranged on the outside of upper cover plate 10, lower cover 11 respectively, and opposite side is then installed on shield 18 and base plate 19 respectively.Described centrifugal blower 17 is installed on the center of shield 18, and its position corresponds in the border circular areas of upper fin 15 center, and is arranged at directly over upper cover plate 10.When after centrifugal blower work, outside air enters inertial exciter through lower fin 16, then centrifugal blower 17 is entered through the hole at the hole at lower cover 11 center, dynamic magnet 1, upper cover plate 10 center, the air of being discharged by centrifugal blower 17 again gets back to the external world through upper fin 15, completes wind-cooling heat dissipating operation.Gap bottom described centrifugal blower 17 and between upper cover plate 10 should be not excessive, otherwise will affect heat dispersion.

In addition, in the present embodiment, the center of two annular flange flange 22 of described upper cover plate 10 and lower cover 11 all offers the hole through with the inner chamber of iron core 3, as the entrance and exit of air flowing.Described upper fin 15, the laminated structure of lower fin 16 all have 16, and as shown in Figure 2, upper fin 15 can spirally be distributed in around the hole of upper cover plate 10, its length direction is the tangential direction along centrifugal blower 17 cylindrical; As shown in Figure 3, lower fin 16 can be distributed in around the hole of lower cover 11 radially, its length direction is the radial direction along centrifugal blower 17.In other embodiments, the laminated structure of fin also can have different numbers, and its distribution also can have different forms.

In the present embodiment, upper fin 15, lower fin 16 combine and integrated machine-shaping with upper cover plate 10, lower cover 11 respectively.And in other embodiments, also by heat conductive silica gel, upper fin 15, lower fin 16 are adhered on upper cover plate 10, lower cover 11 respectively.

Described upper leaf spring 8, lower leaf spring 9 are annulus tabular elastic construction, the outer rim of upper leaf spring 8 is fixed between upper cover plate 10 and housing 12, its inner rim is then fixed on the outer wall of yoke 6, the outer rim of lower leaf spring 9 is fixed between lower cover 11 and housing 12, its inner rim is fixed on the outer wall of lower yoke 7, for the weight of a racking magnet 1, simultaneously because upper leaf spring 8, lower leaf spring 9 have the advantages that axial rigidity is low, radial rigidity is high, greatly can retrain the non axial displacement of dynamic magnet 1, ensure that vibrator can along arbitrarily angled work.

In addition, there is resonant frequency in the vibrational system be made up of leaf spring and dynamic magnet in inertial exciter, and in the frequency band only more than this frequency, inertial exciter can effective power output excited vibration.Therefore, in order to expand the working band of vibrator, above-mentioned resonant frequency should be more low better.But this frequency is lower, and spring is softer, under the Action of Gravity Field of quality, static displacement is also larger.After static displacement exceedes certain limit, not only coil can jump out the sphere of action of high-intensity magnetic field, and leaf spring is also easy to be damaged due to excessive displacement.Therefore, intrinsic frequency can not infinitely reduce, and its minimum is relevant to the maximum static displacement that can tolerate.In general, the size of vibrator entirety is larger, and the dynamic amplitude peak vibrated between magnet and shell is larger, and the patient maximum static displacement of institute is also larger, and intrinsic frequency is corresponding lower.In the present embodiment, inertial exciter overall height is designed to 100mm, dynamic magnet 1 is 5mm relative to the amplitude peak that shell 2 vibrates, the simple harmonic oscillator intrinsic frequency be made up of dynamic magnet 1 and upper leaf spring 8, lower leaf spring 9 is 20Hz, now the static displacement of dynamic magnet 1 is about 0.6mm, and the inertial exciter with above-mentioned parameter can meet the application demand of most audio frequency.In other embodiments, the size of inertial exciter can expand or reduce, and maximum vibration amplitude and intrinsic frequency also can carry out expanding or reducing according to the actual requirements.

In other embodiments, described dynamic magnet 1 and each part thereof also can be column structures that are square or other shapes, now go up coil 13, lower coil 14 and upper leaf spring 8, lower leaf spring 9 also can have corresponding shape.Described shell 2 and each part thereof also can be column structures that are square or other shapes, and the heat dispersion of vibrator is also improved on its surface further by modes such as perforation, cutting, stickup radiators.

It should be noted last that, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted.Although be described in detail the utility model with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is modified or equivalent replacement, do not depart from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.

Claims (9)

1. based on the inertial exciter of the twin coil single action magnet structure of magnetic fluid heat radiation, it is characterized in that, comprising: dynamic magnet (1), upper coil (13), lower coil (14), leaf spring, shell (2) and magnetic fluid (20), described leaf spring is annulus tabular elastic construction, be supported in shell (2) for magnet (1) will be moved, and limit the non axial displacement of braking magnet (1), the circular tube structure that the two ends of described dynamic magnet (1) are symmetrical set, the magnetic field that dynamic magnet (1) is produced annularly tubular structure tube wall form loop, the end face outside of each circular tube structure is equipped with a looping pit (23), for placing coil, described looping pit (23) by the inner chamber of circular tube structure and the external world through, described upper coil (13) and lower coil (14) are all wrapped in one end of a coil rack (21), the center be fixed on inside shell (2) both ends of the surface of the other end symmetry of two coil racks (21), what described upper coil (13) and lower coil (14) were symmetrical is positioned at two looping pits (23), after two coils pass into reverse alternating current, coil (13) on this, electromagnetic excitation power in the same way will be produced between lower coil (14) and dynamic magnet (1), make between magnet (1) and shell (2), to produce the excitation that relative motion forms vibration, described magnetic fluid (20) is poured in looping pit (23), heat conduction for upper coil (13) and lower coil (14) being produced dispels the heat to dynamic magnet (1).

2. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 1, it is characterized in that, described shell (2) comprising: upper cover plate (10), lower cover (11) and housing (12); Described upper cover plate (10) and lower cover (11) are covered in upper port and the lower port of housing (12) respectively, the center of this upper cover plate (10) and the center of lower cover (11) are equipped with an annular flange flange (22), are respectively used to the fixing upper coil rack of coil (13) and the coil rack of lower coil (14).

3. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 2, it is characterized in that, described shell (2) also comprises heat abstractor, this heat abstractor comprises: centrifugal blower (17), some upper fin (15) and some lower fin (16), described upper fin (15) and lower fin (16) are individually fixed in the top of upper cover plate (10) and the bottom of lower cover (11), the center of two annular flange flange (22) of described upper cover plate (10) and lower cover (11) all offers the hole through with the inner chamber of iron core (3), as the entrance and exit of air flowing, described centrifugal blower (17) is arranged at directly over upper cover plate (10), it flows into inertial exciter by electrical energy drive air-flow from lower fin (16), and through lower cover (11), the inner chamber of iron core (3), inertial exciter is flowed out from upper fin (15) after upper cover plate (10).

4. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 3, it is characterized in that, around the described spiral hole being distributed in upper cover plate (10) of upper fin (15), around described lower fin (16) hole being distributed in lower cover (11) radially.

5. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 1 and 2, it is characterized in that, described dynamic magnet (1) comprising: iron core (3), upper permanent magnet (4), lower permanent magnet (5), upper yoke (6) and lower yoke (7); Described iron core (3) tubular structure in hollow, the outer wall of its top and bottom is equipped with a ring support (25), circumferentially offers annular groove (24) between two ring supports (25); Described upper permanent magnet (4) is fixed between a ring support (25) and upper yoke (6), forms a circular tube structure after making iron core (3) upper end, upper permanent magnet (4) and upper yoke (6) combination; Described lower permanent magnet (5) is fixed between another ring support (25) and lower yoke (7), form another circular tube structure after making iron core (3) lower end, lower permanent magnet (5) and lower yoke (7) combination, upper permanent magnet (4), the one side that lower permanent magnet (5) is relative should have identical polarity.

6. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 5, it is characterized in that, the gap be provided with between the outer wall of described iron core (3) upper end and upper yoke (6) forms a looping pit (23), and the gap be provided with between the outer wall of this iron core (3) lower end and lower yoke (7) forms another looping pit (23).

7. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 5, it is characterized in that, described upper permanent magnet (4) and lower permanent magnet (5) adopt permanent-magnet material to be processed into circulus, or adopt permanent-magnet material to be processed into some sector structures, and be spliced into ring-type.

8. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 5, it is characterized in that, described iron core (3), upper yoke (6) and lower yoke (7) all adopt soft magnetic materials to make.

9. the inertial exciter of the twin coil single action magnet structure based on magnetic fluid heat radiation according to claim 5, it is characterized in that, the quantity of described leaf spring is two; The outer rim of one of them leaf spring is fixed between upper cover plate (10) and housing (12), and its inner rim is fixed on the outer wall of yoke (6); The outer rim of another leaf spring is fixed between lower cover (11) and housing (12), and its inner rim is fixed on the outer wall of lower yoke (7).