CN205092754U - Linear vibrating motor - Google Patents

Abstract

The utility model provides a linear vibrating motor, including the oscillator and with oscillator parallel arrangement's stator, the oscillator includes the balancing weight and inlays establishes the vibrating mass who fixes in the balancing weight, and its characterized in that, vibrating mass include the permanent magnet of two piece at least adjacent settings, the stator includes the coil and sets up the guiding core in the coil that include two magnets, and, magnetize direction and the permanent magnet of two magnets of guiding core to magnetize the direction perpendicular, guiding core's two the magnet parallel placements and the opposite direction that magnetizes. The utility model discloses replace the guiding core among the motor coil with the help of two opposite direction's that magnetize magnet, avoided guiding core by the electrical coil magnetization and the influence to the produced magnetic line of force of stator that leads to, improved the stability of motor.

Description

Linear vibration motor

Technical field

The utility model relates to consumer electronics field, more specifically, relates to a kind of linear vibration motor being applied to portable consumer electronics product.

Background technology

Along with the development of the communication technology, portable type electronic product, as mobile phone, handheld device or palm multimedia entertainment equipment etc. enter the life of people.In these portable type electronic products, generally can do system feedback with vibrating motor, the incoming call prompting of such as mobile phone, the vibrational feedback etc. of game machine.But along with the lightening development trend of electronic product, the various components and parts of its inside also need to adapt to this trend, and vibrating motor is no exception.

Existing vibrating motor, generally comprise upper cover and with upper cover formed oscillation space lower cover, do in oscillation space linear vibration oscillator (comprising balancing weight and permanent magnet), be connected upper cover and make oscillator do the elastic supporting member for supporting optical member of double vibrations and be positioned at the stator of a segment distance below oscillator, stator is made up of the coil with magnetic conduction core.

In the vibrating motor of above-mentioned this structure, in the coil of composition stator, generally magnetic conduction core can be set, to increase the magnetic induction of coil, improve the magnetic field intensity of stator, thus give the traction thrust that oscillator is larger.But, because magnetic conduction core is in the magnetic field that hot-wire coil causes for a long time, magnetization phenomenon can be produced unavoidably, and the increase of time thereupon, the magnetization of magnetic conduction core can constantly strengthen, thus affect the magnetic field intensity of stator generation, make the stressed instability of oscillator, finally cause the instability of motor performance.

Utility model content

In view of the above problems, the purpose of this utility model is to provide a kind of linear vibration motor, the magnetic conduction core in original motor coil is substituted, the impact on the magnetic line of force that stator produces caused to avoid magnetic conduction core to be energized coil magnetizing by the magnet that two magnetizing directions are contrary.

The linear vibration motor that the utility model provides, the stator comprising oscillator and be arranged in parallel with oscillator; Oscillator comprises balancing weight and is embedded in the vibrating mass in balancing weight, and wherein, vibrating mass comprises the permanent magnet of at least two pieces of adjacent settings; Stator pack vinculum circle and the magnetic conduction core arranged in coil; Magnetic conduction core comprises two magnets; Further, the magnetizing direction of two magnets of magnetic conduction core is vertical with the magnetizing direction of permanent magnet; Two parallel placements of magnet of magnetic conduction core and magnetizing direction is contrary.

Wherein, preferred scheme is, between adjacent permanent magnet, be provided with conductive magnetic yoke, and the abutting end polarity of the permanent magnet of every two pieces of adjacent settings is identical.

Wherein, preferred scheme is, the magnetizing direction of permanent magnet is mutually vertical with the axis direction of coil.

Wherein, preferred scheme is, vibrating mass comprises three block permanent magnets, is respectively arranged with one piece of conductive magnetic yoke between two adjacent block permanent magnets; Two coils that stator comprises setting corresponding with oscillator and two the magnetic conduction cores be separately positioned in two coils.Wherein, preferred scheme is, be respectively arranged with at the two ends of balancing weight vibration the axis of guide, limit spring and guide vane end stop, limit spring be set in vibration the axis of guide on and spacing between balancing weight and guide vane end stop; Be provided with for the reciprocating pilot hole of the vibration axis of guide in guide vane end stop; One end that the vibration axis of guide gos deep into pilot hole is arranged with axle sleeve.

Wherein, preferred scheme is, is embedded with four the first balanceable magnets in the corner positions of balancing weight; Second balanceable magnet corresponding with the first balanceable magnet is respectively arranged with in the position that shell is corresponding with balancing weight bight; Further, the second balanceable magnet is contrary with the polarity of the abutting end of the first corresponding balanceable magnet; Attract each other between the first corresponding balanceable magnet and the second balanceable magnet.

Wherein, preferred scheme is, the side of linear vibration electric motor is respectively arranged with electromagnet structure, comprises secondary coil and is placed in the secondary magnetic conduction core in secondary coil.

Wherein, preferred scheme is, coil and flexible circuit board are connected and fixed; Flexible circuit board is fixed on the bonnet of linear vibration motor by buckle structure, and is communicated with external circuit.

Wherein, preferred scheme is, the position of the corresponding stator of balancing weight is provided with the avoiding structure of dodging stator; Also be provided with the groove holding vibrating mass; Vibrating mass is fixing in a groove by gluing.

Wherein, preferred scheme is, balancing weight is tungsten steel block, nickel steel block or nickel tungsten block.

Accompanying drawing explanation

By reference to the content below in conjunction with the description of the drawings and claims, and understand more comprehensively along with to of the present utility model, other object of the present utility model and result will be understood and easy to understand more.In the accompanying drawings:

Fig. 1 is the overall detonation configuration schematic diagram of the linear vibration motor according to embodiment of the present utility model;

Fig. 2 is the combining structure schematic diagram of the linear vibration motor according to embodiment of the present utility model;

Fig. 3 is vibrating mass according to the utility model embodiment and stator combined structure schematic diagram;

Fig. 4 is the operation principle schematic diagram according to the utility model embodiment;

Fig. 5 be according to the coil electricity of the utility model embodiment after the magnetic line of force move towards schematic diagram;

Fig. 6 is vibrating mass according to another embodiment of the utility model and stator combined structure schematic diagram;

Fig. 7 a is the action principle schematic diagram of the magnetic balance guiding mechanism according to the utility model embodiment;

Fig. 7 b is the action principle schematic diagram of the magnetic balance guiding mechanism according to the utility model embodiment.

In figure: upper casing 1, bonnet 2, balancing weight 31, magnet 32a, 32b, 32c, conductive magnetic yoke 33a, 33b, coil 41a, 41b, 41 ', magnetic conduction core 42a, 42a ', 42b, 42b ', the vibration axis of guide 51a, 51b, limit spring 52a, 52b, guide vane end stop 53a, 53b, axle sleeve 54a, 54b, flexible circuit board 7.

Label identical in all of the figs indicates similar or corresponding feature or function.

Embodiment

In the following description, for purposes of illustration, in order to provide the complete understanding to one or more embodiment, many details have been set forth.But, clearly, also these embodiments can be realized when there is no these details.In other example, one or more embodiment for convenience of description, known structure and equipment illustrate in block form an.

Below with reference to accompanying drawing, specific embodiment of the utility model is described in detail.

Magnetization is produced in magnetic field that hot-wire coil causes and the instability problem of motor performance that causes because magnetic conduction core is in for a long time in order to solve in existing vibrating motor structure, the utility model employing magnetic core substitutes the magnetic conduction core in motor coil, to avoid the magnetization of magnetic conduction core in coil.

Particularly, Fig. 1 and Fig. 2 respectively illustrates overall detonation configuration according to the linear vibration motor of embodiment of the present utility model and combining structure.

As Fig. 1 and Fig. 2 jointly shown in, the linear vibration motor of the present embodiment mainly comprises shell, oscillator and stator, and wherein, shell comprises upper casing 1 and bonnet 2; Oscillator comprises balancing weight 31 and vibrating mass, and vibrating mass is made up of three block permanent magnet 32a, 32b, 32c of adjacent setting and conductive magnetic yoke 33a, the 33b be separately positioned between adjacent permanent magnet; Two coils 41a, 41b that stator comprises setting corresponding with oscillator and the magnetic conduction core be separately positioned in coil.

Magnetic conduction core is in each of the coils set and includes two be parallel to each other placement and the contrary magnets of magnetizing direction, in the embodiment shown in Fig. 1 and Fig. 2, magnetic conduction core in coil 41a comprises two be parallel to each other placement and contrary magnet 42a, 42a of magnetizing direction ', and the magnetic conduction core in coil 41b comprises two be parallel to each other placement and contrary magnet 42b, 42b of magnetizing direction '.

Because the magnetic conduction core in the coil in linear vibration motor of the present utility model is stable magnet, therefore its magnetic can not change because of the magnetic field of around coil, thus has ensured the stability in the magnetic field that stator produces.

Wherein, the combining structure of vibrating mass and stator as shown in Figure 3.In three block permanent magnets of adjacent setting, each permanent magnet is identical with the polarity of the abutting end of adjacent permanent magnet, the i.e. order arrangement in S-N, N-S, S-N, conductive magnetic yoke is arranged between adjacent permanent magnet, and the direction at the place, N-S pole of permanent magnet is parallel with the direction of winding of the coil of stator, namely the magnetizing direction of permanent magnet and the axis direction of coil mutually vertical, wherein, the axis direction of coil refers to the direction, axis of the column that coil is formed.The correspondence stator be arranged on below vibrating mass comprise two coils and and be separately positioned on two magnetic conduction cores in two coils, each magnetic conduction core is by two be parallel to each other placement and the contrary magnet compositions of magnetizing direction.The strength of repelling each other can be produced due between the two ends that two permanent magnet polarity is identical, therefore, the magnetic line of force of permanent magnet can to concentrate by adjacent two permanent magnets between conductive magnetic yoke and the coil that is arranged on below vibrating mass, thus increase the magnetic flux through coil as far as possible.

Below by for the operation principle of Fig. 4 simple declaration the utility model linear vibration motor.According to the left hand rule judging electrical conductor Impact direction in magnetic field, stretch out left hand, make thumb and all the other four finger vertical, and all with palm in same plane; Allow magnetic induction line enter from the centre of the palm, and make four fingers point to sense of current, at this moment the direction of thumb indication is exactly the direction of electrified wire suffered Ampere force in magnetic field.Suppose the sense of current in coil, be denoted as in figure the sense of current be vertical view towards inner, be denoted as the sense of current be vertical view towards outward, suppose that first coil is second coil must also be such coil just can all stressed F left, because coil maintains static, based on the relation of active force and reaction force, then and the stressed F ' to the right of permanent magnet.So, the permanent magnet being subject to motive force to the right just drives balancing weight to do translational motion to the right together, thus the spring on the right side of extruding balancing weight, the spring on the left of stretching balancing weight.In like manner, when the current direction changes, according to left hand rule, the direction of the magnetic field force F that coil is subject to is for the right.But because coil maintains static, then permanent magnet is subject to active force that is contrary with F direction and the F ' that size is identical, the permanent magnet being subject to motive force left just drives balancing weight to do translational motion left together, makes the spring at balancing weight two ends continue to be stretched/to extrude after the reinstatement of extruding/extended state simultaneously.Above-mentioned motion hockets, and makes the vibrating mass of permanent magnet and conductive magnetic yoke composition and balancing weight form the vibration reciprocating motion being parallel to stator.

According to above-mentioned operation principle, after coil electricity, the trend of the magnetic line of force influencing each other produced due to magnetic field between stator and vibrating mass as shown in Figure 5.

In the above-described embodiments, vibrating mass comprises three block permanent magnets, but is also not limited to said structure in concrete application process, also suitably can select the quantity of the permanent magnet forming vibrating mass according to the size of vibration force needed for application product.The vibrating mass be made up of two block permanent magnets as shown in more permanent magnet or Fig. 6 and the combining structure of stator.

As shown in Figure 6, vibrating mass comprises two block permanent magnets of the identical adjacent setting of abutting end polarity, between this two block permanent magnet, be provided with conductive magnetic yoke, by coil be arranged on the below that stator that the magnetic conduction core in coil forms is arranged on vibrating mass.

In the embodiment shown in Fig. 1 and Fig. 2, vibrating mass is embedded in balancing weight, to drive balancing weight horizontal vibration.Particularly, be provided with the avoiding structure of dodging stator at the middle part of balancing weight, the center that balancing weight is provided with avoiding structure is provided with the groove holding vibrating mass.In concrete assembling process, first the permanent magnet of composition vibrating mass and conductive magnetic yoke can be fixed together, then in modes such as gluing or laser electric welding, vibrating mass entirety be fixed in a groove.Balancing weight 31 can adopt tungsten steel block or nickel steel block or the contour density-metal material of nickel tungsten to make, and to strengthen vibration force, makes the vibration of electronic product stronger.

In addition, linear vibration motor of the present utility model also comprises two the vibration axis of guides 51a, 51b being arranged on balancing weight 31 two ends, and limit spring 52a, 52b, and guide vane end stop 53a, 53b, limit spring is set on the vibration axis of guide 51a, 51b.In the embodiment shown in Fig. 1, Fig. 2, guide vane end stop 53a, 53b are separately fixed on upper casing 1, two the vibration axis of guides 51a, 51b are separately fixed at the two ends of balancing weight 31, guide vane end stop 53a, 53b are also provided with for the reciprocating pilot hole of the vibration axis of guide.Like this, under the effect in the magnetic field that vibrating mass produces after stator energising, drive balancing weight 31 and be fixed on the vibration axis of guide 51a, 51b limited range internal vibration at pilot hole at balancing weight 31 two ends.

Wherein, be set in the vibration axis of guide 51a, 51b upper limit spring 52a, 52b respectively and be limited between guide vane end stop 53a, 53b of balancing weight 31 and correspondence respectively, for the vibration of oscillator provides elastic restoring force.

In addition, in order to reduce the frictional force between the vibration axis of guide and pilot hole, improve the quality of products as far as possible, can also on one end that the vibration axis of guide gos deep into pilot hole sheathed axle sleeve 54a, 54b, the contact-making surface smooth abrasion-proof of axle sleeve and pilot hole.The increase of axle sleeve reduces the contact area of the vibration axis of guide and pilot hole, and the material that density is high, smooth surface is wear-resisting can be adopted to make axle sleeve, on the basis not increasing cost, the frictional force between the vibration axis of guide and pilot hole can be reduced as far as possible, improve degree of lubrication.

As another execution mode of the present utility model, also guide vane end stop can be separately fixed at the two ends of balancing weight, or balancing weight and guide vane end stop are designed to integrative-structure, guide vane end stop is arranged for the reciprocating pilot hole of the vibration axis of guide, and two vibration axis of guides are separately fixed on upper casing, axle sleeve is set in one end (in this case near one end of balancing weight) with pilot hole effect on the axis of guide.Like this, under the effect in the magnetic field that vibrating mass produces after stator energising, drive balancing weight and be fixed on guide vane end stop edge vibration axis of guide vibration in the limited range of pilot hole at balancing weight two ends.

Obviously, the amplitude of oscillator vibration determines that the vibration axis of guide gos deep into the degree of depth of pilot hole, the vibration axis of guide gos deep into the degree of depth of end-to-end distance from the bottom of pilot hole and the outer peripheral width of Edge Distance stator of avoiding structure of pilot hole.In the embodiment shown in Fig. 1, Fig. 2 and Fig. 3, the horizontal range of the center line of the magnetic conduction core of distance between center line corresponding (the also namely nearest) stator of conductive magnetic yoke is 0.1 ~ 0.3mm, so, the corresponding vibration axis of guide go deep into pilot hole the degree of depth, the dark end-to-end distance as pilot hole of the vibration axis of guide all should slightly larger than 0.2mm from the degree of depth of the bottom of pilot hole and the outer peripheral width of Edge Distance stator of avoiding structure.

In order to provide stable magnetic balance guiding to motor, be also provided with magnetic balance guiding mechanism in the utility model, particularly, Fig. 7 a and Fig. 7 b shows the action principle of the magnetic balance guiding mechanism according to the utility model embodiment respectively from different perspectives.

As Fig. 7 a and Fig. 7 b jointly shown in, the magnetic balance guiding mechanism of the utility model embodiment, be included in a pair first balanceable magnets 61a, 61b that the two ends upright side walls of balancing weight 31 is arranged respectively, accordingly, and a pair second balanceable magnet 62a, the 62bs corresponding with first balanceable magnet 61a, 61b that on shell, the position corresponding with the end of balancing weight 31 is also arranged respectively, and second balanceable magnet 62a, 62b attracts each other with first corresponding balanceable magnet 61a, 61b.

In other words, four first balanceable magnets 61a, 61b are embedded with in the corner positions of balancing weight 31, position corresponding with the bight of balancing weight 31 on shell is provided with second balanceable magnet 62a, 62b corresponding with first balanceable magnet 61a, 61b, and second balanceable magnet 62a, 62b is contrary with the polarity of the abutting end of first corresponding balanceable magnet 61a, 61b.

Due to two two ends first balanceable magnet 61a, 61b being separately fixed to balancing weight 31, and be separately fixed on outer casing inner wall with two to two couple second balanceable magnet 62a, 62b that first balanceable magnet 61a, 61b attracts each other, namely on shell, the two ends of oscillation space are fixedly installed two pairs of magnet of location, the oscillator two ends attraction that can give to vibrate in space, so, in oscillator vibration process, oscillator four bights will be subject to the directed attraction in four bights corresponding to oscillation space, thus provide magnetic balance to lead for the vibration of oscillator in oscillation space.Can not there is deformation in this magnetic balance guiding, also can not produce wearing and tearing, have higher accuracy and stability relative to existing mechanical balance guiding means.

It should be noted that, second balanceable magnet 62a, 62b also can use electromagnet structure, such as, arranges electromagnet structure respectively in the side of linear vibration motor, and electromagnet structure comprises secondary coil and is placed in the secondary magnetic conduction core in secondary coil.By to electromagnet structure energizing magnetic, coordinate with first balanceable magnet 61a, 61b the magnetic balance guiding mechanism forming linear vibration motor.

In addition, the linear vibration motor that the utility model provides also comprises flexible circuit board (PFCB) 7, stator is fixed on FPCB7, the coil lead of stator is communicated with external circuit by the circuit on FPCB7, FPCB7 and upper casing 1 are fixed, and bonnet 2 can be fixed by the mode of buckle and FPCB7.

Describe in an illustrative manner according to linear vibration motor of the present utility model above with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that the linear vibration motor that above-mentioned the utility model is proposed, various improvement can also be made on the basis not departing from the utility model content.Therefore, protection range of the present utility model should be determined by the content of appending claims.

Claims (10)

1. a linear vibration motor, the stator comprising oscillator and be arranged in parallel with described oscillator; Described oscillator comprises balancing weight and is embedded in the vibrating mass in described balancing weight, it is characterized in that,

Described vibrating mass comprises the permanent magnet of at least two pieces of adjacent settings;

Described stator pack vinculum circle and the magnetic conduction core be arranged in described coil;

Described magnetic conduction core comprises two magnets; Further,

The magnetizing direction of two magnets of described magnetic conduction core is vertical with the magnetizing direction of described permanent magnet;

Two parallel placements of magnet of described magnetic conduction core and magnetizing direction is contrary.

2. linear vibration motor as claimed in claim 1, is characterized in that,

Between adjacent described permanent magnet, be provided with conductive magnetic yoke, the abutting end polarity of the permanent magnet of every two pieces of adjacent settings is identical.

3. linear vibration motor as claimed in claim 1, is characterized in that,

The magnetizing direction of described permanent magnet is mutually vertical with the axis direction of described coil.

4. linear vibration motor as claimed in claim 1, is characterized in that,

Described vibrating mass comprises three block permanent magnets, is respectively arranged with one piece of conductive magnetic yoke between two adjacent block permanent magnets;

Two coils that described stator comprises setting corresponding with described vibrating mass and two the magnetic conduction cores be separately positioned in described two coils.

5. linear vibration motor as claimed in claim 1, is characterized in that,

Be respectively arranged with the vibration axis of guide, limit spring and guide vane end stop at the two ends of described balancing weight, described limit spring to be set on the described vibration axis of guide and spacing between described balancing weight and described guide vane end stop;

Be provided with for the reciprocating pilot hole of the described vibration axis of guide in described guide vane end stop; One end that the described vibration axis of guide gos deep into described pilot hole is arranged with axle sleeve.

6. linear vibration motor as claimed in claim 1, is characterized in that,

Four the first balanceable magnets are embedded with in the corner positions of described balancing weight;

Second balanceable magnet corresponding with described first balanceable magnet is respectively arranged with in the position that shell is corresponding with described balancing weight bight; Further,

Described second balanceable magnet is contrary with the polarity of the abutting end of corresponding described first balanceable magnet; Attract each other between corresponding described first balanceable magnet and described second balanceable magnet.

7. linear vibration motor as claimed in claim 1, is characterized in that:

The side of described linear vibration electric motor is respectively arranged with electromagnet structure, comprises secondary coil and is placed in the secondary magnetic conduction core in described secondary coil.

8. linear vibration motor as claimed in claim 1, is characterized in that,

Described coil and flexible circuit board are connected and fixed; Described flexible circuit board is fixed on the bonnet of described linear vibration motor by buckle structure, and is communicated with external circuit.

9. linear vibration motor as claimed in claim 1, is characterized in that,

The position of the corresponding described stator of described balancing weight is provided with the avoiding structure of dodging described stator;

Also be provided with the groove holding described vibrating mass;

Described vibrating mass is fixed in described groove by gluing.

10. linear vibration motor as claimed in claim 1, is characterized in that,

Described balancing weight is tungsten steel block, nickel steel block or nickel tungsten block.