CN204465232U - Brushless motor and optical disc apparatus - Google Patents
Brushless motor and optical disc apparatus Download PDFInfo
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- CN204465232U CN204465232U CN201520029484.2U CN201520029484U CN204465232U CN 204465232 U CN204465232 U CN 204465232U CN 201520029484 U CN201520029484 U CN 201520029484U CN 204465232 U CN204465232 U CN 204465232U
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Abstract
The utility model provides a kind of brushless motor and optical disc apparatus, and this brushless motor is outer-rotor type, and mounting panel has arc sections and the main part more outstanding to radial outside than the periphery of rotor retainer.Mounting panel comprises: main part is near portion, and it is formed at main part, and the upper surface of main part near portion is positioned at than the position of flat part by axial upside, and when top view, main part is positioned at the region overlapping with magnet near portion, and extends in the circumferential along magnet; And arc sections is near portion, it is formed at arc sections, and the upper surface of arc sections near portion is positioned at than the position of flat part by axial upside, and when top view, arc sections is positioned at the region overlapping with magnet near portion, and extends in the circumferential along magnet.Arc sections is configured at the radially outer edge of arc sections near portion, when top view, relative to central axis, near portion, point-symmetric region has the region overlapping near portion with main part with arc sections.
Description
Technical field
This technology relates to a kind of brushless motor, particularly relates to a kind of brushless motor of disc drives and has the optical disc apparatus of this brushless motor.
Background technology
In optical disc apparatus, optical take-up apparatus carries out near arc sections or the action away from arc sections, and this optical take-up apparatus becomes the recess with the form fit of the arc sections of the mounting panel of motor, and in circular shape.By this action, optical take-up apparatus can change the radial position relative to CD, and then can carry out the read-write of recorded data.
In order to make the spin stabilization of CD, the motor for this optical disc apparatus adopts the structure (precompressed) by magnetic force, rotor being attracted to stator usually.Such as, in Japanese Laid-Open Patent Publication 2009-100540 publication, be configured with circular magnet on the top of stator, by the magnetic action that puts on rotor retainer by the magnetic attachment of rotor retainer to stator side.But, under this magnet most cases, comprise neodymium or the such terres rares of dysprosium.Therefore, there is the high tendency of price in magnet, is the parts wishing to remove.Therefore, magnetic attraction is obtained in order to utilize additive method, disclosed in Japanese Laid-Open Patent Publication 2001-057755 publication, have employed following method: the protuberance that the ring-type of giving prominence to towards rotor magnet is set at the position opposed with magnet of mounting panel, thus make magnetic attraction act between rotor magnet and protuberance, apply precompressed relative to mounting panel to rotor.
But, in the motor of optical disc apparatus, make screw pass the first real machine installing hole, the second real machine installing hole and the 3rd real machine installing hole, thus motor is fixed on optical disc apparatus.Now, to give prominence to the imaginary line of the second real machine installing hole from connection first real machine installing hole in arc sections and be provided with in the edge of arc sections in axis opposed with rotor retainer and near close the portion of rotor retainer, the vibration of the circumferential magnetization number of poles composition of generation magnet.
Utility model content
The purpose of this utility model is to cut down components number, maintains the magnetic attraction of rotor relative to mounting panel of brushless motor, reduces the vibration of brushless motor.
The brushless motor of the execution mode that the application is exemplary comprises: axle, and its central axis along upper downward-extension configures; Rotor retainer, it in the cylindrical shape having lid, and is fixed on axle directly or indirectly; Magnet, it is tubular, and is fixed on the inner peripheral surface of rotor retainer; Stator, it is opposed with magnet in radial direction; Bearing cage part, its fixed stator; Parts of bearings, it is accommodated in bearing cage part, and axle supports as rotating by described parts of bearings; Mounting panel, it is formed by magnetic, and is fixed with bearing cage part; And circuit board, it is fixed on the upper surface of mounting panel, and circuit board is electrically connected with stator, mounting panel has: main part, it is more outstanding to radial outside than the periphery of rotor retainer, and main part has the first real machine installing hole, the second real machine installing hole and the 3rd real machine installing hole, bearing cage part is positioned on the imaginary line of connection first real machine installing hole and the second real machine installing hole; And arc sections, its region from the side contrary with the 3rd real machine installing hole relative to imaginary line of main part centered by central axis towards radial outside be arc-shaped give prominence to, the feature of described brushless motor is, mounting panel comprises: flat part, and it is configured with circuit board; Main part is near portion, and it is formed at main part, and the upper surface of main part near portion is positioned at than the position of flat part by axial upside, and when top view, main part is positioned at the region overlapping with magnet near portion, and main part extends along magnet in the circumferential near portion; And arc sections is near portion, it is formed at arc sections, the upper surface of arc sections near portion is positioned at than the position of flat part by axial upside, when top view, arc sections is positioned at the region overlapping with magnet near portion, and arc sections extends along magnet in the circumferential near portion, arc sections is configured at the radially outer edge of arc sections near portion, when top view, relative to central axis, near portion, point-symmetric region has the region overlapping near portion with main part with arc sections, when top view, circuit board extends from the outside of side direction rotor retainer in magnet.
Further, the circumferential lengths of main part near portion and the circumferential lengths sum of arc sections near portion are the over half of the circumferential length of magnet.
Further, main part is connected near portion with arc sections near portion.
Further, arc sections is positioned at the whole region of the outer rim of arc sections near portion.
Further, main part has the first main part near portion and the second main part near portion near portion, when top view, relative to central axis, near portion, point-symmetric region has the region overlapping near portion with the second main part with the first main part.
Further, when top view, relative to central axis and arc sections, near portion, point-symmetric region comprises the first main part near portion and the second main part near both portions.
Further, when top view, main part is configured in the side contrary with arc sections relative to imaginary line at least partially near portion.
Further, when top view, main part strides across imaginary line circumferentially near portion.
And, the circumferential end of main part near portion is opposed with circuit board in the circumference centered by central axis, circuit board has substrate extension, substrate extension extends along the outer peripheral face of stator, and substrate extension comprises multiple spiral connecting portion, stator has to the outstanding multiple teeth of radial outside, and the radical of tooth is 12, and the circumferential lengths of substrate extension is centered by central axis more than 90 degree and in the scope of less than 180 degree.
Further, substrate extension and main part near portion in the circumferential across gap configuration.
Further, main part is near profile opposed across gap in radial direction at least partially of portion and substrate extension.
Further, when top view, the circumferential angle in the region that circuit board is overlapping with magnet is centered by central axis more than 20 degree and in the scope of less than 45 degree.
Further, arc sections is consistent with the radial position of the radial outer end of rotor retainer near the radial position of the radial outer end in portion.
Further, when top view, main part is arc-shaped near portion.
Further, arc sections is opposed across gap in the circumferential near portion with main part near portion.
Further, arc sections is formed by bending near portion, and main part is die-cut and formed by half near portion.
Further, main part has near portion: the first main part is near portion, and it is opposed near the circumferential end side end in portion with arc sections in circumference; And second main part near portion, it is opposed with the circumferential other end side end of arc sections near portion in circumference, when top view, circuit board extends towards the 3rd real machine installing hole side from the inner side of magnet in the circular gap between portion near portion and the second main part at the first main part and configures.
Further, main part is consistent near the radial position of the radial outer end in portion with arc sections near the radial position of the radial outer end in portion.
Further, mounting panel has and connects the connecting portion of main part near portion and flat part, and connecting portion has: inner side connecting portion, and it is positioned at the position leaning on radially inner side than main part near portion; And outside connecting portion, it is positioned at the position leaning on radial outside than main part near portion, and outside connecting portion leans on the position of radial outside in the outer rim than arc sections.
Further, mounting panel has and connects the connecting portion of main part near portion and flat part, and connecting portion has: inner side connecting portion, and it is positioned at the position leaning on radially inner side than main part near portion; And outside connecting portion, it to be positioned at than main part near portion by the position of radial outside, and the radial position of the inner of inner side connecting portion is consistent with the radial position of the inner of magnet, or the inner of inner side connecting portion is positioned at and leans on radially inner side position than the inner of magnet.
Further, main part is near thickness of slab one medium-sized of the axial distance between the upper surface and the upper surface of flat part in portion than mounting panel.
Further, the axial centre of the magnetic pole strength of stator is positioned at the position leaning on axially downside than the axial centre of magnet.
Further, rotor retainer has plectane portion, and plectane portion extends towards radially inner side in the upside of cylindrical portion, and rotor retainer also has disc placement section, and disc placement section is positioned at the upside in plectane portion.
The optical disc apparatus of another execution mode that the application is exemplary has: brushless motor; Access portion; And shell, it holds brushless motor and access portion in inside.
By the execution mode that the application is exemplary, can components number be cut down, and maintain the magnetic attraction of rotor relative to mounting panel of brushless motor, and the vibration of brushless motor can be reduced.
By the detailed description of following the utility model preferred implementation, with reference to accompanying drawing, above-mentioned and other feature of the present utility model, key element, step, feature and advantage more clearly can be understood.
Accompanying drawing explanation
Fig. 1 is the longitudinal section of optical disc apparatus.
Fig. 2 is the longitudinal section of brushless motor.
Fig. 3 is the vertical view of the mounting panel of brushless motor.
Fig. 4 is the stereogram of the mounting panel of brushless motor.
Fig. 5 is the vertical view of the mounting panel of brushless motor involved by variation.
Embodiment
Below, with reference to accompanying drawing, exemplary execution mode of the present utility model is described.In addition, scope of the present utility model is not limited to following execution mode, can change arbitrarily in the scope of technological thought of the present utility model.
And, as long as no special note, then in the following description, the direction with centrally axis J is set to above-below direction, by the radial direction centered by central axis J referred to as " radial direction ", by around the axle of the circumference centered by central axis J and central axis J referred to as " circumference ".
In addition, in this manual, extending along the vertical direction except comprising situation about strictly extending along the vertical direction, also comprising the situation along extending with the direction that the scope being less than 45 ° tilts relative to above-below direction.Further, in this manual, radially extending except comprising strictly radially namely except the situation of the direction vertical with above-below direction extension, also comprising situation about extending with the direction that the scope being less than 45 ° tilts relative to radial direction.
Fig. 1 is the longitudinal section of the optical disc apparatus 1 of the brushless motor had involved by an execution mode of the present utility model.Optical disc apparatus 1 CD 15 is rotated centered by central axis J and carries out the device of " reading of information " and " write of information ".As shown in Figure 1, optical disc apparatus 1 comprises shell 11, pan arrest 12, brushless motor 13 and access portion 14.
Shell 11 is the housings holding pan arrest 12, brushless motor 13 and access portion 14 in inside.CD 15 can be configured at pan arrest 12, by making CD 15 in the inside and outside slippage of shell 11, CD 15 can be moved into relative to shell 11 and take out of.Brushless motor 13 is fixed on pan arrest 12 indirectly.CD 15 has through hole in central authorities, and CD 15 is fixed on brushless motor 13 by through hole and rotates centered by central axis J.In addition, describe tray type optical disk drive device 1 in the present embodiment, but range of application of the present utility model is not limited to tray type optical disk drive device 1, such as, also can be applied to suction type CD driver driving.
Access portion 14 comprises the bare headed portion 14A with light hit detect function.By this structure, access portion 14 can make bare headed portion 14A move along the recording surface of the CD 15 rotated by brushless motor 13, carries out the side in " reading of information " and " write of information " or two sides.
Fig. 2 is the longitudinal section of the brushless motor 13 involved by an execution mode of the present utility model.Fig. 3 is the vertical view of the mounting panel 4 of brushless motor 13, circuit board 5 and bearing cage part 6.Fig. 4 is the stereogram of mounting panel 4.As shown in Figure 2, brushless motor 13 comprises stator 2, rotor retainer 3, mounting panel 4 and circuit board 5.
Stator 2 is fixed on mounting panel 4 by bearing cage part 6.Stator 2 has through hole through vertically at central part, is pressed in the through hole of stator 2 by bearing cage part 6, thus stator 2 and bearing cage part 6 are fixed.Stator 2 has the multiple teeth 21 extended towards radial outside, forms multiple coil 23 by coiled electrical conductor (not shown) on multiple tooth 21.In the present embodiment, stator 2 has 12 rooted teeth 21.In addition, stator 2 is fixed on bearing cage part 6 by the method also can fixed etc. except press-in by bonding or screw.Further, also stator 2 can be fixed on the upside of mounting panel 4, replace being fixed on bearing cage part 6 with this.
Rotor retainer 3 in the cylindrical shape having lid, and comprises axle 31 and magnet 32.Rotor retainer 3 has: the roughly cylindric cylindrical portion 33 extended vertically and in the upside of cylindrical portion 33 towards the plectane portion 34 that radially inner side extends.Further, rotor retainer 3 also has the disc placement section 35 of the upside being positioned at plectane portion 34.By this structure, in optical disc apparatus 1, CD 15 can be fixed on disc placement section 35.The central axis J that axle 31 vertically extends configures, and is fixed on rotor retainer 3 directly or indirectly.The parts of bearings 61 that axle 31 is accommodated in bearing cage part 6 supports, and axle 31 is retained and can rotates relative to stator 2.In the present embodiment, parts of bearings 61 is oil-impregnated sintered bearings of substantially cylindrical shape.The magnet 32 of tubular is fixed with at the inner peripheral surface of cylindrical portion 33.Magnet 32 is opposed with the multiple coils 23 being formed at stator 2 in radial direction, and when top view, magnet 32 is in the circular configuration centered by central axis J.Magnet 32 both can be the parts being formed as tubular, also can be by curling for flat parts and be formed as cylindric parts.
In the present embodiment, the axial centre of the magnetic pole strength of preferred stator 2 is positioned at the position leaning on axially downside than the axial centre of magnet 32.By this structure, stator 2 and magnet 32 magnetic center position is in the axial direction different.Therefore, the lower end of magnet 32 by axial underdrag, the vibration of rotor retainer 3 when reducing rotation, thus can noise be reduced.Further, can also compensating action in aftermentioned main part near portion 42A or arc sections near the magnetic attraction between portion 43A and magnet 32.But, the axial centre of the magnetic pole strength of stator 2 is not necessarily positioned at the position leaning on axially downside than the axial centre of magnet 32, also both axial centre can be made consistent, or make the axial centre of the magnetic pole strength of stator 2 be positioned at the position leaning on axially upside than the axial centre of magnet 32.
With reference to figure 2 and Fig. 3, mounting panel 4 is formed by magnetic, and mounting panel 4 has through hole 41 through vertically.In addition, in figure 3, the outer peripheral face of bearing cage part 6 is corresponding with the inner peripheral surface of through hole 41.Bearing cage part 6 is pressed in through hole 41, and mounting panel 4 and bearing cage part 6 fix.In addition, except press-in, such as also can by rivet mounting panel 4 and bearing cage part 6 to carry out fixing of mounting panel 4 and bearing cage part 6.Further, also can by bonding and rigid bearing holding member 6 and mounting panel 4.Further, mounting panel 4 is without the need to having through hole, and the recess that the lower surface that mounting panel 4 also can be made to have a mounting panel 4 is outstanding to axially downside, bearing cage part 6 is fixed in this recess.
Circuit board 5 is fixed on the axially surface of mounting panel 4.As mounting panel 4 fixing means with circuit board 5, have that flange is riveted, screw is fixed and gluing etc.Circuit board 5 has spiral connecting portion 51, substrate extension 52 and outside extension 53.When top view, circuit board 5 extends from the outside of side direction rotor retainer 3 in magnet 32.Circuit board 5 is by being connected the one end of the wire being wound in multiple tooth 21 with the spiral connecting portion 51 of the upper surface being positioned at circuit board 5 and being electrically connected with stator 2.Circuit board 5 has substrate extension 52, and this substrate extension 52 extends along the outer peripheral face of stator 2 in the circumferential at the upper surface of mounting panel 4, and this substrate extension 52 has multiple spiral connecting portion 51.When top view, the radial inner end of substrate extension 52 is positioned at the position leaning on the position of radially inner side than the inner of magnet 32.The circumferential lengths of substrate extension 52 is centered by central axis J more than 90 degree and in the region of less than 180 degree.By this structure, even if when circuit board 5 is configured in the upper surface of mounting panel 4, also can guarantee the space of placement substrate extension 52, and the vibration of rotor retainer 3 can be reduced further.When top view, outside extension 53 is the positions extended from the inner of magnet 32 towards radial outside in circuit board 5.The external connecting (not shown) be connected with outside is configured with near the radial outer end of outside extension 53.
Mounting panel 4 has main part 42 and arc sections 43.Main part 42 has the position more outstanding to radial outside than the periphery of rotor retainer 3, and main part 42 has the first real machine installing hole 44, second real machine installing hole 45 and the 3rd real machine installing hole 46.When top view, bearing cage part 6 is positioned on the imaginary line L of connection first real machine installing hole 44 and the second real machine installing hole 45.In other words, when top view, the imaginary line L and the bearing cage part 6 that connect the first real machine installing hole 44 and the second real machine installing hole 45 have overlapping region.
Arc sections 43 and main part 42 are the integrated component be linked into one be made up of the magnetic material as parts.Arc sections 43, in main part 42, with imaginary line L for benchmark position, is given prominence to from the region being positioned at the side contrary with the 3rd real machine installing hole 46 towards radial outside.Arc sections 43 is positions of the arc-shaped centered by central axis J.Further, arc sections radially outer edge 43C configures along rotor retainer radial outer end 3A.That is, preferably when top view, arc sections radially outer edge 43C is roughly consistent with rotor retainer radial outer end 3A.Therefore, the curvature of preferred arc sections radially outer edge 43C is roughly the same with the curvature of rotor retainer radial outer end 3A.
Mounting panel 4 has flat part 47, main part near portion 42A and arc sections near portion 43A.Flat part upper surface 47A to be positioned at than main part near portion upper surface 42D and arc sections near both upper surfaces of portion 43A by the position of axial downside.Therefore, main part is positioned at than the position of flat part 47 by axial upside near portion upper surface 42D.Further, when top view, main part is positioned at the region overlapping with magnet 32 near portion 42A, and extends in the circumferential centered by central axis J along magnet 32.Circuit board 5 is configured at flat part upper surface 47A.In the present embodiment, main part is the face be connected near portion upper surface 42D and arc sections near the upper surface of portion 43A, is in same plane.By this structure, the rigid of mounting panel 4 can be improved.
When top view, arc sections is positioned at than the position of magnet outer peripheral face 32A by radial outside near portion radial outer end 43B.By this structure, arc sections can be made more outstanding to radial outside than magnet outer peripheral face 32A near portion 43A.Therefore, as described in detail, between portion 43A, magnetic attraction can be obtained at magnet 32 and arc sections efficiently below.
Arc sections is configured at arc sections radially outer edge 43C near portion 43A.Arc sections is positioned at than the position of flat part upper surface 47A by axial upside near the upper surface of portion 43A.Further, when top view, arc sections is positioned at the region overlapping with magnet 32 near portion 43A, and extends in the circumferential centered by central axis J along magnet 32.That is, when top view, arc sections is near portion 43A in roughly circular shape, and arc sections is opposed with magnet 32 in axis near the upper surface of portion 43A.Arc sections is connected with flat part 47 by connecting portion inside arc sections 49 near the radial inner end of portion 43A.In the present embodiment, arc sections near portion 43A by the radial outside position of arc sections 43 is formed towards axially lateral bend.In addition, form the processing of arc sections when portion 43A and be not limited to bend, such as also can be die-cut and formed by half.
In the present embodiment, arc sections is positioned at the whole region of arc sections radially outer edge 43C near portion 43A.By this structure, can increase further and act on arc sections near the magnetic attraction between portion 43A and magnet 32.
With reference to figure 4, in the present embodiment, arc sections is roughly consistent with the radial position of rotor retainer radial outer end 3A near the radial position of portion radial outer end 43B.By this structure, without the need to making arc sections lean out from rotor retainer radial outer end 3A near portion radial outer end 43B, just arc sections can be extended to radial outside as far as possible near the radial outside of portion 43A.Therefore, without the need to making arc sections radially outer edge 43C lean out from rotor retainer radial outer end 3A, just can increase further and acting on arc sections near the magnetic attraction between portion 43A and magnet 32.
Near portion, radial inner edge 42C is positioned at than the position of magnet inner peripheral surface 32B by radial outside main part.This is that connecting portion 48A and stator 2 interfere inside aftermentioned main part.When making brushless motor 13 slimming, want to make stator 2 near mounting panel 4 as far as possible, but connecting portion 48A is configured at when the position that axis is overlapping with stator 2 inside main part, preferably by main part, near portion, radial inner edge 42C is configured in outside as far as possible.But when not requiring brushless motor 13 slimming, near portion, radial inner edge 42C is positioned at than the position of magnet inner peripheral surface 32B by radially inner side preferred main part.Main part is positioned at than the position of flat part upper surface 47A by axial upside near portion upper surface 42D.In the present embodiment, main part is formed by carrying out bending machining to the main part 42 of mounting panel 4 near portion 42A.In addition, form the processing method of main part when portion 42A and be not limited to bending machining, such as, also can be formed by half Punching Technology or crimping processing.
In the present embodiment, preferable substrate extension 52 and main part near portion 42A in the circumferential across gap configuration.By this structure, the radial width of substrate extension 52 can be formed significantly, therefore, it is possible to guarantee the configuration degree of freedom of Wiring pattern in substrate extension 52.
When top view, main part near portion 42A in roughly arc-shaped.Near portion, radial inner edge 42C and main part are configured on the periphery centered by central axis J near portion radial outer end 42B main part respectively.But main part is not necessarily positioned on the periphery centered by central axis J near portion radial outer end 42B, as long as be positioned at than the position of magnet outer peripheral face 32A by radial outside, just do not limit shape.That is, as long as main part is arc-shaped near portion radial outer end 42B.By this structure, main part can be set as shape along magnet 32 near portion 42A, and between portion 42A, magnetic attraction can be obtained at magnet 32 and main part efficiently as described in detail later.
In the present embodiment, main part is consistent near the radial position of portion radial outer end 43B with arc sections near the radial position of portion radial outer end 42B.By this structure, compared to main part near radial position and the arc sections of portion radial outer end 42B near the different situation of the radial position of portion radial outer end 43B, can not reducing effect in main part near the magnetic attraction between portion 42A and magnet 32, just can effectively to apply flexibly than main part near portion radial outer end 42B by the space of radial outside.
Mounting panel 4 has and connects the main part connecting portion 48 of main part near portion 42A and flat part 47.Main part connecting portion 48 have be positioned at than main part near portion 42A by radially inner side position main part inside connecting portion 48A and be positioned at than main part near portion 42A by radial outside position main part outside connecting portion 48B.Outside main part, connecting portion 48B is positioned at than the position of arc sections radially outer edge 43C by radial outside.Therefore, outside main part, connecting portion 48B to be positioned at than arc sections near the outer rim of portion 43A by the position of radial outside.By this structure, when being driven CD 15 by optical disc apparatus 1, optical take-up apparatus can be made near near arc sections 43.If consider the reading of CD 15, then wish to make optical take-up apparatus near rotor retainer radial outer end 3A as far as possible.That is, preferred arc sections 43 is not given prominence to from rotor retainer radial outer end 3A.Even if arc sections 43 is given prominence to from rotor retainer radial outer end 3A, if consider the close configuration of optical take-up apparatus, then preferably overhang is little as far as possible.Further, the arc sections that is formed at arc sections 43 is preferably strengthened near portion 43A at the axis area opposed with magnet 32.In addition, in the present embodiment, the first real machine installing hole 44, second real machine installing hole 45 and the 3rd real machine installing hole 46 are all formed at flat part 47, but are not necessarily formed at flat part 47.Namely, also main part can be made to extend to radial outside than rotor retainer radial outer end 3A near portion 42A, leaning on the position of radial outside to form the first real machine installing hole 44, second real machine installing hole 45 or the 3rd real machine installing hole 46 than rotor retainer radial outer end 3A.Now, at least one in the first real machine installing hole 44, second real machine installing hole 45 and the 3rd real machine installing hole 46 is formed at than the position of flat part 47 by axial upside.
In the present embodiment, main part is made up of the face be connected with the upper surface of arc sections near portion 43A near portion upper surface 42D, and arc sections is positioned at the position leaning on radially inner side than the outer end of main part connecting portion 48B outside portion near portion radial outer end 43B.By this structure, main part can be increased near portion 42A and magnet 32 at axially opposed area, and the structure that arc sections 43 do not give prominence to from the outer peripheral face of rotor retainer 3 can be realized.
When top view, main part strides across imaginary line L circumferentially near portion 42A.Owing to leaning on the region of the 3rd real machine installing hole 46 side to utilize three installation screws etc. to be fixed on real machine than imaginary line L, therefore there is high rigidity.That is, by this structure, the rigid of mounting panel 4 can be improved.Further, this structure is the effective structure of the effect of vibration for obtaining aftermentioned reduction brushless motor 13.In addition, in the present embodiment, main part near portion 42A circumferentially, but is not limited thereto.Such as, both can linearlyly extend, also can at branched halfway.As long as main part obtains the structure of magnetic attraction near the opposed with magnet 32 at least partially of portion 42A when top view.
In the present embodiment, main part is the over half of the circumferential length of magnet 32 near the circumferential lengths centered by central axis J of portion 42A and arc sections near the circumferential lengths sum centered by central axis J of portion 43A.By this structure, can increase further and act on magnet 32 and main part between portion 42A and magnet 32 and the magnetic attraction of arc sections between portion 43A.
Fig. 4 is the stereogram of mounting panel 4.As shown in Figure 4, main part is connected near portion 43A with arc sections near portion 42A.By this structure, the rigid of mounting panel 4 becomes higher.Further, in the present embodiment, inside main part, the surface of connecting portion 48A is connected with the surface of connecting portion inside arc sections 49, is in same plane.
At this, main part near portion 42A and arc sections all opposed with magnet 32 in axis near portion 43A.Therefore, magnetic attraction act on main part near between portion 42A and magnet 32 and arc sections near between portion 43A and magnet 32, rotor retainer 3 is attracted by axial downside.Thus, even if when rotated, also can prevent rotor retainer 3 from floating, make spin stabilization.
In the present embodiment, when top view, to have near the point-symmetric region of portion 43A with main part near the overlapping region of portion 42A relative to central axis J and arc sections.By this structure, the vibration of rotor retainer 3 can be reduced according to aftermentioned reason, and the impact that the vibration that can reduce arc sections 43 is exaggerated.
At this, in the present embodiment, the mechanism reducing the vibration of rotor retainer 3 is as follows.First, the situation that have employed the structure different from present embodiment is considered.Such as, suppose to form arc sections near portion 43A in arc sections 43, and arc sections is equal with the circumferential lengths of be magnetized three poles of magnet 32 near the circumferential lengths of portion 43A.Now, if arc sections is positioned at the junction of magnetic pole and magnetic pole near the circumferential end side end 431C in portion, then arc sections is also positioned at the junction of magnetic pole and magnetic pole near the circumferential other end side end 431D in portion.When rotor retainer 3 rotates a half of the pole be magnetized, arc sections is positioned at the central authorities of magnetic pole near the circumferential end side end 431C in portion, and arc sections is also positioned at the central authorities of magnetic pole near the circumferential other end side end 431D in portion.Because magnet 32 changes relative to the circumferential position of arc sections near portion 43A, the magnetic loop be therefore made up of near portion 43A magnet 32 and arc sections changes.That is, the size of magnetic attraction changes along with the rotation of rotor retainer 3 time dependent.Further, during rotor retainer 3 revolves and turns around, the magnitude relationship of magnetic attraction is exchanged rotor number of poles m time, and the change of these magnetic attractions shows as the vibration of rotor retainer 3 and arc sections 43.Such as, when rotor number of poles m being set to ten sextupoles, the rotating speed of motor being set to 5000rpm, the composition that motor revolves vibration when turning around is 83Hz.Therefore vibration component when the vibration number produced due to the change along with above-mentioned magnetic attraction is rotation 16 times is 1333Hz.
And, arc sections 43 is in the cantilever support state supported by the first real machine installing hole 44 and the second real machine installing hole 45, therefore being easily subject to the time dependent change of the magnetic attraction because producing near portion 43A in arc sections and the impact of vibration that causes, becoming large with the amplitude connecting the vibration that the imaginary line L of the first real machine installing hole 44 and the second real machine installing hole 45 is benchmark.Further, the vibration that the above-mentioned time dependent because of magnetic attraction changes and causes not only produces at mounting panel 4, and also produces at rotor retainer 3.When magnetic attraction is large, rotor retainer 3 significantly tilts in the mode of arc sections 43 side step-down, and when magnetic attraction hour, this inclination diminishes.And, when rotor retainer 3 vibrates as above, such as in the lower axial end of rotor retainer 3 and arc sections near the gap turn narrow of the upper surface of portion 43A, act on rotor retainer 3 and the magnetic attraction of arc sections between portion 43A strengthens further, when gap broadens, magnetic attraction weakens further.Because this action is carried out repeatedly, therefore rotor retainer 3 is subject to the impact of the cantilever support state that arc sections 43 is supported by the first real machine installing hole 44 and the second real machine installing hole 45, strengthens the impact of vibration on arc sections 43 further.That is, only will be arranged in the magnetic attachment structure of arc sections 43 near portion, the vibration of arc sections 43 becomes large.
Therefore, according to the structure of the application's utility model, consider with central axis J for benchmark and arc sections form the situation of main part near portion 42A near the point-symmetric region of portion 43A.Form if so, although then magnetic attraction acts on arc sections near portion 43A, magnetic attraction also acts on main part near portion 42A.And, because main part is formed at central axis J as benchmark and arc sections are near the point-symmetric region of portion 43A near portion 42A, therefore by above-mentioned mechanism, and act on the magnetic attraction of arc sections near the identical frequency of the magnetic attraction of portion 43A and same phase and act on main part near portion 42A at least partially.Thus, in rotor retainer 3, the magnetic attraction carrying out feature association with the vibration number corresponding with rotor number of poles m is also had to act on arc sections 43 side of rotor retainer 3 and a part for main part 42 side.Consequently, a part for the moment that the magnetic attraction because of arc sections 43 side and main part 42 side that act on rotor retainer 3 for benchmark with central axis J produces is cancelled out each other, and reduces the vibration that rotor retainer 3 produces along with this moment.
Such as, when arc sections is formed at 120 degree of regions centered by central axis J near portion 43A, by central axis J for benchmark and arc sections to become 120 degree of regions centered by central axis J near the point-symmetric region of portion 43A.Further, consider that 30 degree of regions in above-mentioned point-symmetric region define the situation of main part near portion 42A.Now, because of by central axis J for benchmark act on moment that this main part produces near the magnetic attraction between portion 42A and magnet 32 with because of act on arc sections in portion 43A centered by central axis J and the moment that produces near the magnetic attraction between the point-symmetric 30 degree of regions of portion 42A and magnet 32 of aforementioned body portion cancel out each other.Therefore, reduce the magnetic attraction of arc sections 43 side because acting on rotor retainer 3 centered by central axis J and the time dependent change of the moment that produces, thus reduce the vibration of rotor retainer 3.Further, by reducing the vibration of rotor retainer 3, can reducing effect change in the time dependent of arc sections near the magnetic attraction of portion 43A, therefore, it is possible to the vibration of the reduction arc sections 43 that is benchmark with imaginary line L further.
In the present embodiment, when top view, main part being configured at least partially relative to the imaginary line L side contrary with arc sections 43 near portion 42A.By this structure, with imaginary line J for benchmark time, the moment produced near the magnetic attraction of portion 43A because acting on arc sections is cancelled out each other at least partially with the moment produced near the magnetic attraction of portion 42A because acting on main part, reduce further the vibration of arc sections 43.
Inside main part, the radial position of the inner of connecting portion 48A is consistent with the radial position of the inner of magnet 32, or inside main part, the inner of connecting portion 48A is positioned at the position leaning on radially inner side than the radial inner end of magnet 32.By this structure, the interference that stator 2 occurs with mounting panel 4 can be reduced, and with the inner of connecting portion 48A inside main part be positioned at than magnet 32 the inner by radial outside position situation compared with, can increasing action in main part near the magnetic attraction between portion 42A and magnet 32.
Main part is near thickness of slab one medium-sized of the axial distance between portion upper surface 42D and flat part upper surface 47A than mounting panel 4.By this structure, main part can be made near portion 42A near magnet 32 by bending machining etc., thus powerful magnetic attraction can be obtained.
Main part is opposed with circuit board 5 in the circumference centered by central axis J near portion circumferential end 42E.That is, substrate extension 52 and main part near portion 42A in the circumferential across gap configuration.Further, in the present embodiment, the circumferential lengths of substrate extension 52 is centered by central axis J more than 90 degree and in the scope of less than 180 degree.More particularly, the circumferential lengths of substrate extension 52 is 120 degree.By this structure, even if when circuit board 5 is configured in the upper surface of mounting panel 4, also can guarantee the space of placement substrate extension 52, and the vibration of rotor retainer 3 can be reduced further.
Below, be described with reference to the variation of accompanying drawing to the brushless motor 13 involved by an execution mode of the present utility model.In addition, in the variation of following record, the scope of utility model is also not limited to following execution mode, can change arbitrarily in the scope of technological thought of the present utility model.Further, for by comparing with an above-mentioned execution mode, the obvious position of corresponding relation omits the description, also omit about diagram.
Fig. 5 is the vertical view of the mounting panel 40 of the brushless motor 13 of the variation of brushless motor 13 involved by an execution mode of the present utility model, circuit board 50 and bearing cage part 6.
As Fig. 5 records, arc sections is opposed across gap in the circumferential near portion 420A with main part near portion 430A.By this structure, arc sections is split shaping near portion 430A and main part near portion 420A in the circumferential.Therefore, easily accuracy control is carried out to mould, and easily shaping.Further, due to easy by main part near portion 420A be configured to offset because of with imaginary line L for benchmark acts on the part of the moment that arc sections produces near the magnetic attraction of portion 430A, therefore, it is possible to reduce the vibration of arc sections 430 efficiently.
In the present embodiment, main part has the first main part near portion 422A and the second main part near portion 423A near portion 420A.When top view, to have near the point-symmetric region of portion 422A with the second main part near the overlapping region of portion 423A relative to central axis J and the first main part.By this structure, about act on the first main part near portion 422A magnetic attraction and act on the magnetic attraction of the second main part near portion 423A, the frequency of the change of time dependent at least partially of each magnetic attraction is identical with phase place, thus reduce further the vibration of rotor retainer 3.
In Figure 5, when top view, region Z be relative to central axis J and arc sections near the point-symmetric region of portion 430A, utilize arrow to show the angular distribution about central axis J residing for the Z of region in figure.In the present embodiment, first main part is comprised near portion 422A and second main part near portion 423A both relative to central axis J and arc sections near the point-symmetric region Z of portion 430A when top view.By this structure, when rotor retainer 3 rotates, a part for the magnetic attraction produced near portion 430A in arc sections is identical with the phase place of the large minor cycle of a part for the magnetic attraction produced near portion 422A at the first main part.Further, a part for the magnetic attraction produced near portion 430A in arc sections is identical with the phase place of the large minor cycle of a part for the magnetic attraction produced near portion 423A at the second main part.Thus, about the first main part magnetic attachment rotor retainer 3 in portion 422A power and in portion 430A, attract the power of rotor retainer 3 in arc sections, because wanting to make rotor retainer 3 with imaginary line L for a part for the moment that benchmark rolls oblique magnetic attraction towards arc sections 430 and produce is cancelled out each other.And, about the second main part magnetic attachment rotor retainer 3 in portion 423A power and in portion 430A, attract the power of rotor retainer 3 in arc sections, because wanting to make rotor retainer 3 with imaginary line L for a part for the moment that benchmark rolls oblique magnetic attraction towards arc sections 430 and produce is cancelled out each other.Thus, reduce the vibration of rotor retainer 3, and reduce the vibration of arc sections 430.
Main part near portion 420A have circumference and arc sections near opposed the first main part of portion circumference end side end 431C near portion 422A and in circumference with arc sections the second main part that circumferential other end side end 431D is opposed near portion near portion 423A.When top view, circuit board 50 extends towards the 3rd real machine installing hole 46 side from the inner side of magnet 32 in the circular gap between portion 423A near portion 422A and the second main part at the first main part and configures.By this structure, can from the first main part near portion 422A and the second main part the circular gap between portion 423A draw outside extension 530 towards than mounting panel 40 by the position of radial outside.
When top view, the circumferential angle in the region that circuit board 50 is overlapping with magnet 32 is centered by central axis J more than 20 degree and in the scope of less than 45 degree.By this structure, the circumferential width of main part near portion 420A can be increased, increase magnetic attraction, and outside extension 530 can be drawn to the radial outside of mounting panel 40.
Main part is near profile opposed across gap in radial direction at least partially of portion 420A and substrate extension 520.By this structure, by making main part near portion 420A and circuit board 50 at diametrically contraposition, can enlarged body portion near the circumferential lengths of portion 420A.
As modified embodiment of the present embodiment, such as also can by bending and form arc sections near portion 430A, and die-cut and form main part near portion 420A by half.By this structure, can by easily shaping bending machining and form arc sections near portion 430A in arc sections 430, and can by can half economical space saving shaping Punching Technology and form main part near portion 420A in main part 420.
Above, according to execution mode, the utility model is illustrated, but only otherwise damage aim of the present utility model, just can carries out various change.
The utility model such as can be used in motor and the optical disc apparatus 1 of optical disc apparatus.
Claims (24)
1. a brushless motor, it comprises:
Axle, its central axis along upper downward-extension configures;
Rotor retainer, it is in the cylindrical shape having lid, and is fixed on described axle directly or indirectly;
Magnet, it is tubular, and is fixed on the inner peripheral surface of described rotor retainer;
Stator, it is opposed with described magnet in radial direction;
Bearing cage part, its fixing described stator;
Parts of bearings, it is accommodated in described bearing cage part, and described axle supports as rotating by described parts of bearings;
Mounting panel, it is formed by magnetic, and is fixed with described bearing cage part; And
Circuit board, it is fixed on the upper surface of described mounting panel, and described circuit board is electrically connected with described stator,
Described mounting panel has:
Main part, it is more outstanding to radial outside than the periphery of described rotor retainer, and described main part has the first real machine installing hole, the second real machine installing hole and the 3rd real machine installing hole, described bearing cage part is positioned on the imaginary line of the described first real machine installing hole of connection and described second real machine installing hole; And
Arc sections, its region from the side contrary with described 3rd real machine installing hole relative to described imaginary line of described main part centered by described central axis towards radial outside be arc-shaped give prominence to,
The feature of described brushless motor is,
Described mounting panel comprises:
Flat part, it is configured with described circuit board;
Main part is near portion, it is formed at described main part, the upper surface of described main part near portion is positioned at than the position of described flat part by axial upside, when top view, described main part is positioned at the region overlapping with described magnet near portion, and described main part extends along described magnet in the circumferential near portion; And
Arc sections is near portion, it is formed at described arc sections, the upper surface of described arc sections near portion is positioned at than the position of described flat part by axial upside, when top view, described arc sections is positioned at the region overlapping with described magnet near portion, and described arc sections extends along described magnet in the circumferential near portion
Described arc sections is configured at the radially outer edge of described arc sections near portion,
When top view, relative to described central axis, near portion, point-symmetric region has the region overlapping near portion with described main part with described arc sections,
When top view, described circuit board extends from the outside of rotor retainer described in side direction in described magnet.
2. brushless motor according to claim 1, is characterized in that,
The circumferential lengths of described main part near portion and the circumferential lengths sum of described arc sections near portion are the over half of the circumferential length of described magnet.
3. brushless motor according to claim 2, is characterized in that,
Described main part is connected near portion with described arc sections near portion.
4. brushless motor according to claim 3, is characterized in that,
Described arc sections is positioned at the whole region of the outer rim of described arc sections near portion.
5. brushless motor according to claim 1, is characterized in that,
Described main part has the first main part near portion and the second main part near portion near portion,
When top view, relative to described central axis, near portion, point-symmetric region has the region overlapping near portion with described second main part with described first main part.
6. brushless motor according to claim 5, is characterized in that,
When top view, relative to described central axis and described arc sections, near portion, point-symmetric region comprises described first main part near portion and described second main part near both portions.
7. brushless motor according to claim 6, is characterized in that,
When top view, described main part is configured in the side contrary with described arc sections relative to described imaginary line at least partially near portion.
8. brushless motor according to claim 7, is characterized in that,
When top view, described main part strides across described imaginary line circumferentially near portion.
9. brushless motor according to claim 8, is characterized in that,
The circumferential end of described main part near portion is opposed with described circuit board in the circumference centered by described central axis,
Described circuit board has substrate extension, and described substrate extension extends along the outer peripheral face of described stator, and described substrate extension comprises multiple spiral connecting portion,
Described stator has to the outstanding multiple teeth of radial outside,
The radical of described tooth is 12,
The circumferential lengths of described substrate extension is centered by described central axis more than 90 degree and in the scope of less than 180 degree.
10. brushless motor according to claim 9, is characterized in that,
Described substrate extension and described main part near portion in the circumferential across gap configuration.
11. brushless motors according to claim 9, is characterized in that,
Described main part is near profile opposed across gap in radial direction at least partially of portion and described substrate extension.
12. brushless motors according to claim 9, is characterized in that,
When top view, the circumferential angle in the region that described circuit board is overlapping with described magnet is centered by described central axis more than 20 degree and in the scope of less than 45 degree.
13. brushless motors according to claim 1, is characterized in that,
Described arc sections is consistent with the radial position of the radial outer end of described rotor retainer near the radial position of the radial outer end in portion.
14. brushless motors according to claim 13, is characterized in that,
When top view, described main part is arc-shaped near portion.
15. brushless motors according to claim 14, is characterized in that,
Described arc sections is opposed across gap in the circumferential near portion with described main part near portion.
16. brushless motors according to claim 15, is characterized in that,
Described arc sections is formed by bending near portion,
Described main part is die-cut and formed by half near portion.
17. brushless motors according to claim 16, is characterized in that,
Described main part has near portion:
First main part is near portion, and it is opposed near the circumferential end side end in portion with described arc sections in circumference; And
Second main part is near portion, and it is opposed with the circumferential other end side end of described arc sections near portion in circumference,
When top view, described circuit board extends towards described 3rd real machine installing hole side from the inner side of described magnet in the circular gap between portion near portion and described second main part at described first main part and configures.
18. brushless motors according to claim 17, is characterized in that,
Described main part is consistent near the radial position of the radial outer end in portion with described arc sections near the radial position of the radial outer end in portion.
19. brushless motors according to claim 18, is characterized in that,
Described mounting panel has and connects the connecting portion of described main part near portion and described flat part,
Described connecting portion has: inner side connecting portion, and it is positioned at the position leaning on radially inner side than described main part near portion; And outside connecting portion, it is positioned at the position leaning on radial outside than described main part near portion,
Described outside connecting portion leans on the position of radial outside in the outer rim than described arc sections.
20. brushless motors according to claim 18, is characterized in that,
Described mounting panel has and connects the connecting portion of described main part near portion and described flat part,
Described connecting portion has: inner side connecting portion, and it is positioned at the position leaning on radially inner side than described main part near portion; And outside connecting portion, it is positioned at the position leaning on radial outside than described main part near portion,
The radial position of the inner of described inner side connecting portion is consistent with the radial position of the inner of described magnet, or the inner of described inner side connecting portion is positioned at the inner than described magnet by radially inner side position.
21. brushless motors according to claim 19 or 20, is characterized in that,
Axial distance between the upper surface of described main part near portion and the upper surface of described flat part is than thickness of slab one medium-sized of described mounting panel.
22. brushless motors according to any one of claim 1 to 20, is characterized in that,
The axial centre of the magnetic pole strength of described stator is positioned at the position leaning on axially downside than the axial centre of described magnet.
23. brushless motors according to any one of claim 1 to 20, is characterized in that,
Described rotor retainer has plectane portion, and described plectane portion extends towards radially inner side in the upside of cylindrical portion,
Described rotor retainer also has disc placement section, and described disc placement section is positioned at the upside in described plectane portion.
24. 1 kinds of optical disc apparatus, is characterized in that having:
Brushless motor according to any one of claim 1 to 23;
Access portion; And
Shell, it holds described brushless motor and described access portion in inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520029484.2U CN204465232U (en) | 2014-08-28 | 2015-01-16 | Brushless motor and optical disc apparatus |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420491357X | 2014-08-28 | ||
| CN201420491357 | 2014-08-28 | ||
| JP2014227623A JP2016093042A (en) | 2014-11-08 | 2014-11-08 | Brushless motor |
| JP2014-227623 | 2014-11-08 | ||
| CN201520029484.2U CN204465232U (en) | 2014-08-28 | 2015-01-16 | Brushless motor and optical disc apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204465232U true CN204465232U (en) | 2015-07-08 |
Family
ID=53672059
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520032093.6U Expired - Fee Related CN204465233U (en) | 2014-08-28 | 2015-01-16 | Brushless motor and optical disc apparatus |
| CN201520029484.2U Expired - Fee Related CN204465232U (en) | 2014-08-28 | 2015-01-16 | Brushless motor and optical disc apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520032093.6U Expired - Fee Related CN204465233U (en) | 2014-08-28 | 2015-01-16 | Brushless motor and optical disc apparatus |
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| Country | Link |
|---|---|
| CN (2) | CN204465233U (en) |
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2015
- 2015-01-16 CN CN201520032093.6U patent/CN204465233U/en not_active Expired - Fee Related
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| CN204465233U (en) | 2015-07-08 |
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