CN102163891B - Magnetization device, slewing device and manufacture method of slewing device - Google Patents
Magnetization device, slewing device and manufacture method of slewing device Download PDFInfo
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- CN102163891B CN102163891B CN 201110042940 CN201110042940A CN102163891B CN 102163891 B CN102163891 B CN 102163891B CN 201110042940 CN201110042940 CN 201110042940 CN 201110042940 A CN201110042940 A CN 201110042940A CN 102163891 B CN102163891 B CN 102163891B
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Abstract
The invention provides a magnetization device, a slewing device and a manufacture method of the slewing device. The magnetization device comprises a magnetization coil 302, four adjustable chips 304, a magnetic yoke, a magnetization substrate 308 and an installation part 310. Cylinder-shaped magnetic material is magnetized to form a cylindrical magnet by the magnetization device. The magnetic yoke is equipped with a connection part 306a and eight magnetization salient poles 306b. When the magnetic material is installed on the magnetization device 300, each of the magnetization salient poles 306b is arranged relative to the inner surface of the magnetic material. The connection part 306a is connected with eight magnetization salient poles 306b. The four adjustable chips 304 are arranged between the eight magnetization salient poles 306b and the inner surface of the magnetic material, so that the position relationship is adjusted. The magnetization device can reduce the eccentricity of the magnetic pole of magnets.
Description
Technical field
The present invention relates to magnetizing assembly, use manufacture method and the slewing of being made by this manufacture method, the particularly magnetization technology of magnetizing assembly of the slewing of this magnetizing assembly.
Background technology
As the media that are used for computer storage etc., hard disk drive is widely cognitive.In hard disk drive, made the magnetic recording disk High Rotation Speed that is formed with recording track by brushless electric machine.For read/write is included in magnetic data in recording track, on the surface of magnetic recording disk with small gap configuration magnetic head.
Usually, brushless electric machine has the iron core that is wound with coil on stator, has on rotor by the magnetized magnet cylindraceous of magnetizing assembly.Drive when use current flowing when having in coil, produce magnetic flux by iron core, the interaction of the magnetic pole by this magnetic flux and magnet, the torque (for example patent documentation 1) that generation is rotated brushless electric machine.
Will become the magnetizing assembly of the magnetic material of magnet as being used for magnetization, for example the magnetizing assembly of patent documentation 2 records is widely known.
Patent documentation 1: JP 2007-198555 communique
Patent documentation 2: JP 2006-340430 communique
Under this present situation, the inventor recognizes following problem.
As a gimmick that realizes the hard disk drive high capacity, it is the width stenosis that makes track recording., due to such as torque pulsation etc. and during the face direction vibration at magnetic recording disk, as narrow in the width of track recording when hard disk drive, the possibility of the trace turmoil of track recording is arranged.As the trace turmoil of track recording, may produce malfunction when the recording played of data.
As hard disk drive one of vibrative reason in rotation, can think the bias of the driving use magnetic pole of magnet.Can think as large in this bias, torque pulsation also becomes greatly, produces large vibration.At this, the departing from of the rotating shaft when " bias " refers to that the magnetic center of the magnetic pole of magnet for example and magnet are assembled into rotation after brushless electric machine.
Summary of the invention
The present invention proposes in view of this present situation, and its purpose is to provide a kind of technology of bias of the magnetic pole that reduces magnet.
Form of implementation of the present invention is about magnetizing assembly.This magnetizing assembly is that magnetic material cylindraceous is carried out magnetized magnetizing assembly, has: when on this magnetizing assembly, magnetic material being installed with a plurality of salient poles of the relative configuration of magnetization object face of magnetic material; The connecting portion that connects these a plurality of salient poles; Between a plurality of salient poles and magnetization object face, be used for to adjust the accent core element of the position relationship of these a plurality of salient poles and magnetic material.
According to this mode, can be by transferring core element to adjust the position relationship of a plurality of salient poles and magnetic material.
Another form of implementation of the present invention is the manufacture method of slewing.The method has uses above-mentioned magnetizing assembly, and magnetic material cylindraceous is carried out magnetized operation, and with the magnetic material that the is magnetized operation as the magnet assembling.
" slewing " can be also the device for the activation record disk, can be for example brushless electric machine.In addition, can be also to carry the also device of rotary actuation recording disc, can be for example hard disk drive.
In addition, above inscape combination in any, or with inscape of the present invention or show phase double replacement between method, device, system etc., also can be used as the invention process state.
According to the present invention, can reduce the bias of the magnetic pole of magnet.
Description of drawings
Fig. 1 means the vertical view of disk drive.
Fig. 2 is the A-A line cutaway view of Fig. 1.
Fig. 3 (a)～(c) is the key diagram for the explanation magnetizing assembly relevant to embodiment.
Fig. 4 represents magnetic material is installed to the state of the magnetizing assembly relevant to embodiment, is the cutaway view corresponding to Fig. 3 (b).
Fig. 5 represents magnetic material is installed to the state of the magnetizing assembly relevant to comparative example, is the cutaway view corresponding to Fig. 3 (b).
Fig. 6 represents the front view of the magnetizing assembly relevant to variation.
Fig. 7 is the C-C line cutaway view of Fig. 6.
Description of reference numerals is as follows:
10 turntables, 20 axles, 22 flanges, 40 cylinder-shaped magnets, 40a inner surface, 50 base plates, 60 laminated cores, 70 coils, 100 disk drives, 200 magnetic recording disks, 300 magnetizing assemblys, 302 magnetizing coils, 304 are transferred chip, 306a connecting portion, 306b magnetization salient pole, 308 magnetization substrates, 310 installing components, 400 magnetic materials, R motor axis of rotation, O magnetic field center.
Embodiment
Below, so that more preferably example is as the basis, the present invention will be described with reference to accompanying drawing.Give identical symbol for the same or equal inscape, the element that represent in each accompanying drawing, suitably the repetitive description thereof will be omitted.In addition, for the ease of understanding, suitably enlarge or dwindle for the size of the element in each figure and represent.In each figure, omit the part of expression unessential element for the explanation example.
In the magnetizing assembly relevant to example, when as the magnetic material of magnetization object when being loaded into the mode of the relative configuration of salient pole of magnetizing assembly, between salient pole and magnetic material, across transferring core element, its gap is along circumferential even.The eccentric degree of the magnetic pole that is magnetized can be reduced thus, the vibration that causes due to this bias can be reduced.
At first, describe for disk drive.This disk drive is formed by the manufacture method manufacturing that comprises the operation of using the magnetizing assembly relevant to example to carry out magnetized operation to magnetic material cylindraceous and the magnetic material that is magnetized being packed into as cylinder-shaped magnet.
(disk drive)
Fig. 1 means the vertical view of disk drive 100.In Fig. 1, for the formation of the inside that represents disk drive 100, represented to have laid down the state of top cover.Disk drive 100 has base plate 50, turntable 10, magnetic recording disk 200, data read/write unit 8, top cover.
Below, with base plate 50 a, side that carry turntable 10 as above, base plate 50 is described.
Fig. 2 is the A-A line cutaway view of Fig. 1.It is the magnetic recording disk 200 of 3.5 feet of 95mm that disk drive 100 carries 2 diameters, and makes its rotation.The diameter in the hole of the central authorities separately of 2 magnetic recording disks 200 of imagination is 25mm, and thickness is 1.27mm.
Cylinder-shaped magnet 40, base plate 50, laminated core 60, coil 70, sleeve 80, flat-panel component 90, lubricant 92 that disk drive 100 has the turntable 10, axle 20, flange 22 of cup-shaped slightly, formed by the magnetized magnetic material cylindraceous of the magnetizing assembly relevant to example.
The convex that turntable 10 forms centered by motor axis of rotation R.The below considers the situation of 2 magnetic recording disks 200 of mounting on turntable 10.On the urceolus face 10b cylindraceous of the part of protruding upward of turntable 10, insert the medium pore of 2 magnetic recording disks 200.In addition, the magnetic recording disk of the below in 2 magnetic recording disks 200 is positioned in the lower end of the urceolus face 10b from the outer surface of turntable 10 on radially-protruding table top 10c.The diameter of urceolus face 10b is 25mm.More precisely, the diameter of urceolus face 10b is 24.978 ± 0.01mm.
The 1st circular adjustment element 202 folders are inserted between 2 magnetic recording disks 200.Buckling piece 206 is adjusted element 202 with 2 magnetic recording disks 200 and the 1st and is fixed by being pressed on turntable 10 by the 2nd circular adjustment element 204.Buckling piece 206 is fixed on the top 10a of turntable 10 by a plurality of screws 208.
Be adhesively fixed with cylinder-shaped magnet 40 on the inner surface 10d of turntable 10.Cylinder-shaped magnet 40 is formed by uncommon great soil group materials such as neodymium, iron, boron, radially opposite with 12 salient poles of laminated core 60.The circumferential of inner surface 40a at cylinder-shaped magnet 40 implemented the driving of 8 utmost points with magnetizing.Magnetizing assembly for the manufacture of cylinder-shaped magnet 40 will be narrated in the back.
One end of axle 20 is fixed on the peristome of the center of turntable 10 by being pressed into bonding.The other end of axle 20 is crimped with flange 22.
Be provided with the protuberance 52 centered by motor axis of rotation R on 50a on base plate 50.The outer surface of this protuberance 52 is the side 52a cylindraceous centered by motor axis of rotation R.Be adhesively fixed with sleeve 80 on the inner surface 52b of protuberance 52.In the interior folding and unfolding of sleeve 80, axle 20 is arranged.Be adhesively fixed with flat-panel component 90 on the face of the flange 22 of sleeve 80.
Be injected with lubricant 92 between axle 20 and flange 22, sleeve 80 and flat-panel component 90.Axle 20, flange 22, lubricant 92, sleeve 80 and flat-panel component 90 consist of can support the bearing of turntable 10 with rotating freely.
At the inner surface of sleeve 80, be formed with the 1 group of lambdoid footpath dynamic pressure groove 82 that separates up and down.Lambdoid the 1st axle dynamic pressure groove 24 of formation on flange 22, lambdoid the 2nd axle dynamic pressure groove 26 of formation below flange 22.When disk drive 100 rotation, by the dynamic pressure that these dynamic pressure grooves generate, support turntable 10 and axle 20 at radial direction and direction of principal axis in lubricant 92.
In the open end of sleeve 80 side, be formed on the capillary seal section 98 that expands gradually towards the top in the gap between the outer surface of the inner surface of sleeve 80 and axle 20.Capillary seal section 98 prevents spilling of lubricant 92 according to capillarity.
12 salient poles that laminated core 60 has annulus section and extends to the radial direction outside thus.Laminated core 60 makes it integrated and form by 8 slim magnetic steel plates of lamination and moulding.The insulation coatings such as electrophoretic painting or powder coating have been implemented on the surface of laminated core 60.Be wound with coil 70 on each salient pole.By making the large slightly drive current of three-phase sine-wave shape flow through this coil 70, produce magnetic flux along salient pole.Laminated core 60 is pressed into the side 52a of protuberance 52 by the inner surface that makes its annulus section, or matched in clearance is adhesively fixed.
The below describes the action of disk drive 100 with above formation.Turntable 10 rotations in order to make disk drive 100 provide the three-phase drive electric current to disk drive 100.Flow through coil 70 by this drive current, produce magnetic flux along 12 salient poles.By this magnetic flux, give and cylinder-shaped magnet 40 torques turntable 10 rotations.
The torque pulsation of following analysis of magnetic disk drive device 100.At disk drive 100, the driving by the magnetic field that produces at coil 70 and cylinder-shaped magnet 40 generates driving torque with the interaction of magnetic pole.There is torque pulsation in this driving torque.The basic wave frequency of torque pulsation (hereinafter referred to as the torque pulsation centre frequency) is determined with quantity P (P is natural number) and the long-pending of rotation number N (Hz) of magnetic pole by the driving of the disk drive 100 of three-phase, is expressed as with following formula 1:
3PN (Hz) ... (formula 1)
In fact, existing and acting on epitrochanterian driving torque is unequal so interactional disparity in the rotor process in 1 week, so torque pulsation is subject to the modulation of the frequency that equates with rotation number N (Hz).Therefore, torque pulsation comprises sideband (Sideband) composition by the frequency of following formula 2 expressions.
3PN ± N=(3P ± 1) N (Hz) ... (formula 2)
For example, in the situation that three-phase, a P=8 utmost point, torque pulsation comprises that frequency is that basic wave composition and the frequency of 24N is the sideband composition of 24N ± N=(24 ± 1) N.Confirm according to the inventor's research, during with magnetic pole eccentric large, this sideband composition increases when the driving of cylinder-shaped magnet.
But, the cylinder-shaped magnet 40 that uses the magnetizing assembly relevant to this example 300 to generate, the bias that drives with magnetic pole is inhibited.Therefore, for the disk drive 100 that uses cylinder-shaped magnet 40, its sideband composition is little.Its result can realize vibrating little disk drive 100.
(magnetizing assembly)
Fig. 3 (a)～(c) is the key diagram for explanation magnetizing assembly 300.The front view of Fig. 3 (a) expression magnetizing assembly 300.Fig. 3 (b) is the B-B line cutaway view of Fig. 3 (a).Fig. 3 (c) means the front view that removes the state of transferring chip 304 and installing component 310 from magnetizing assembly 300.
Yoke comprises connecting portion 306a and magnetization salient pole 306b.This magnetization salient pole 306b to radial direction outside extension, has the corresponding number of poles of number of magnetic poles that should have with cylinder-shaped magnet 40 by connecting portion 306a, and for example going up in example is 8 utmost points.
Connecting portion 306a is located in magnetization substrate 308, for omiting spool-like (bobbin), is connected with 8 magnetization salient pole 306b at its metastomium.When the magnetic material as the magnetization object was installed on magnetizing assembly 300, the inner surface of 8 magnetization salient pole 306b and the magnetization object face that becomes magnetic material (below be accompanied by the symbol identical with the inner surface 40a of cylinder-shaped magnet 40) configured relatively.8 magnetization salient pole 306b configure symmetrically with respect to symmetry axis S.
Each transfers chip 304 to be made by nonmagnetic elastomeric material, for non magnetic, and has elasticity.As such elastomeric material, adopt with the magnetic material of the conduct magnetization object of imagining and compare soft material.Therefore, transfer chip 304 gentleer than the magnetic material of the conduct magnetization object of imagination.Such elastomeric material can be for example natural rubber or synthetic rubber or polyimide resin or mylar or these combination in any.
If transfer the coefficient of kinetic friction of chip and magnetic material large, the frictional resistance when inserting the magnetic material of conduct magnetization object becomes large, and operating efficiency can descend.
For this reason, each to transfer chip 304 be that more than 0.1, the material below 0.6 forms by the coefficient of kinetic friction that comprises with magnetic material.The coefficient of kinetic friction of above-mentioned polyimide resin and mylar and magnetic material is below 0.6, satisfies this condition.Its result, the frictional resistance when the magnetic material that inserts as the magnetization object are inhibited, and can increase work efficiency.Transfer chip 304 preferably to be formed at the material below 0.4 by the coefficient of kinetic friction with magnetic material.
When transferring chip 304 to be formed by the material that comprises mylar, transfer the thermal endurance of chip 304 to increase, with the coefficient of kinetic friction step-down of magnetic material, bendability becomes well, easily obtains recuperability.In addition, when transferring chip 304 to be formed by the material that comprises polyimide resin, thermal endurance further improves, and with the coefficient of kinetic friction step-down of magnetic material, bendability becomes better, more easily produces restorability.
What each transferred chip 304 to form to have almost identical thickness t is essentially the laminar of rectangle.Transfer chips 304 to be arranged between 8 magnetization salient pole 306b and the inner surface 40a as the magnetic material of magnetization object for 4, adjust their position relationship, particularly magnetize gap between salient pole 306b and magnetic material.Each transfers top one end of chip 304 to be fixed on the top of connecting portion 306a by installing component 310, and the other end of below is the free end that can move freely.Installing component 310 transfers the mode of an end of chip 304 will transfer chip 304 to fix with clamping between the outer surface above itself and connecting portion 306a.Installing component 310 is to be formed by metals such as stainless steel or brass, is circular element.In addition, installing component 310 also can be formed by resin materials such as polyformaldehyde or polybutene.
When the magnetic material of conduct magnetization object was installed on magnetizing assembly 300, magnetic material inserted from stiff end one side of transferring chip 304, i.e. upside.Like this, the insertion of magnetic material becomes smoothly, transfers chip 304 to be not easy wrinkling.
The magnetic flux that produces when the electric current of magnetization use is flowed in magnetizing coil 302, (Fig. 3 (b)) when seeing from the top, with respect to the magnetic field center O on symmetry axis S becomes in fact 4 groups of forms symmetrically.Magnetic field center O herein can be described as magnetizing assembly 300 magnetic field center in design.Transfer chip 304 when seeing from the top for 4, the form of in fact symmetrically arranging with respect to magnetic field center O is arranged on yoke.In other words, transfer chip 304 along circumferentially equally spaced configuration for 4.
As the magnetic material of magnetization object when being arranged on magnetizing assembly 300, each magnetizes salient pole 306b and has end face 312 with the relative configuration of inner surface 40a of this magnetic material.When flowing into the electric current of magnetization use in magnetizing coil 302, the magnetic flux from end face 312 generations towards inner surface 40a.Each transfers chip 304 to cover at least a portion of the end face 312 of corresponding magnetization salient pole 306b.Such as, each transfers chip 304 to cover end face 312 over half of corresponding magnetization salient pole 306b.
Thus, when magnetic material is installed, can avoid magnetizing the contacting of inner surface 40a of the end face 312 of salient pole 306b and magnetic material, even perhaps contact also can reduce its contact area on magnetizing assembly 300.The surface dynamic friction coefficient of transferring chip 304 is for example below 0.6, is easy to slide.Therefore, the contact area of the magnetic material by reducing metal and the magnetization salient pole 306b of metal or be zero can more successfully be arranged on magnetic material on magnetizing assembly 300.
When large with the circle that joins of end face of magnetization salient pole, transfer the bending of chip to diminish., make the magnetization salient pole and also diminish as the uniform power in gap between the magnetic material of magnetization object with respect to the less thick of transferring chip as this bending, the effect that the inhibition of narrating later drives with the bias of magnetic pole might reduce.For this reason, in this example, when transferring the thickness t of chip 304 to be set in the scope of 0.025 (mm)～0.25 (mm), the diameter of a circle D0 that joins with the end face 312 of 8 magnetization salient pole 306b sets for below 30 (mm).Its result in the time will being installed on magnetizing assembly 300 as the magnetic material of magnetization object, transfers chip 304 fully crooked, can suppress to drive the bias with magnetic pole.
In addition, when the value of diameter D0 for setting, when being made as D1 (mm) as the diameter (internal diameter) of the inner surface 40a of the magnetic material of magnetization object, transfer the thickness t (mm) of chip 304 to satisfy following equation:
Thus, in the time will being installed to magnetizing assembly 300 as the magnetic material of magnetization object, transfer chip 304 fully crooked, can suppress to drive the bias with magnetic pole.
If the insertion resistance in the time of will inserting magnetizing assembly as the magnetic material of magnetization object is large, the time-consuming trouble that operates, poor operation efficiency.And then transfer the wearing and tearing of chip to increase, the frequency gets higher of its repairing, poor operation efficiency.Corresponding, in the magnetizing assembly relevant to example 300, end face 312 and the left and right, the setting interval little by 0.005 (mm) between inner surface 40a of the ratio magnetization salient pole 306b that the thickness t of accent chip 304 is set.Therefore, the insertion resistance force diminishes when magnetic material is inserted into magnetizing assembly 300 can be increased work efficiency.Can also reduce the wearing and tearing of transferring chip 304.
In addition, if transfer chip too thin, the uniform power in gap of magnetization salient pole and magnetic material is died down.For this reason, in this example, more than the thickness t of accent chip 304 is set in 0.025 (mm).Like this, can fully guarantee to make the uniform power in gap.If but transfer chip too thick, and transfer chip to be not easy bending, the insertion resistance when inserting magnetic material can become large.For this reason, in this example, make the thickness t of transferring chip 304 below 0.25 (mm).Like this, can be suppressed at practical degree with inserting resistance.
The below describes the action of magnetizing assembly 300 with above formation.
Consider to use 300 pairs of magnetic materials cylindraceous of magnetizing assembly to carry out magnetized situation.
At the magnetic material installation procedure, from stiff end one side of transferring chip 304, cylindric magnetic material is inserted magnetizing assembly 300.State when Fig. 4 represents magnetic material 400 is installed to magnetizing assembly 300 is the cutaway view corresponding to Fig. 3 (b).As shown in Figure 4, the center U of the magnetic field center O of magnetizing assembly 300 and magnetic material 400 is consistent due to the effect of transferring chip 304.
In the magnetization operation, make magnetizing coil 302 inflow currents, magnetic material 400 is magnetized.When in magnetizing coil 302 during inflow current, produce magnetic field around magnetization salient pole 306b, the inner surface 40a of magnetic material 400 is magnetized to form to drive and uses magnetic pole.Because the center U of the magnetic field center O of magnetizing assembly 300 and magnetic material 400 is consistent well, therefore, the driving that is magnetized does not have in fact bias with magnetic pole, even or have very little yet.
According to the magnetizing assembly 300 of this example, transfer chip 304 by arranging, can improve the consistent degree of magnetic field center O of center U and the magnetizing assembly 300 of magnetic material 400.The driving that therefore, can suppress the to be magnetized bias of magnetic pole.Its result, can reduce that bias due to cylinder-shaped magnet 40 causes, at the lift-launch magnetized magnetic material of device 300 that is magnetized, i.e. vibration the during disk drive 100 of cylinder-shaped magnet 40.
In order to investigate the eccentric inhibition of transferring chip 304 to produce, consider taking off the upper situation that magnetic material 400 is installed of the magnetizing assembly (hereinafter referred to as the magnetizing assembly relevant to comparative example) of transferring chip 304.State when Fig. 5 represents magnetic material 400 is arranged on the magnetizing assembly relevant to comparative example is the cutaway view that corresponds to Fig. 3 (b).
For corresponding to guarantee to be easy to installation property and make inhomogeneous, in comparative example, be designed to be installed at magnetic material 400 state of magnetizing assembly, form the gap between magnetization salient pole and magnetic material 400.At this, as shown in Figure 5, magnetic material 400 might be inserted into setting with the state of the amount that departs from this gap.At this moment, the center U of the magnetic field center O of magnetizing assembly 300 and magnetic material 400 departs from.In this case, when inflow current magnetized in magnetizing coil 302, the driving that is magnetized became eccentric with magnetic pole.Carry with the cylinder-shaped magnet of magnetic pole and be set up at disk cartridge drive as having eccentric driving, as mentioned above, for example, the increase of the sideband composition of torque pulsation might increase vibration.
Use the bias of magnetic pole in order to suppress such driving, can consider that the outer circumference diameter of magnetizing salient pole by increasing subtracts closely spaced method, still, when the internal diameter of magnetic material 400 is prescribed a time limit for the lower of the error on making, make and insert the difficulty that becomes, might damage workability.In addition, when inserting magnetic material 400, the periphery of salient pole might pruning by magnetic material 400 in interior week.At this moment, when carrying out the magnetization of magnetic material 400 in a large number, the outer periderm of magnetization salient pole gradually weares and teares and diminishes, and might damage the circularity of the circle of salient pole end face formation.The driving of its result, cylinder-shaped magnet further becomes large with the eccentric of magnetic pole, makes the sideband composition of the torque pulsation of disk drive increase, and then might encumber the high capacity of hard disk drive.Therefore, be difficult to adopt the outer circumference diameter of magnetizing salient pole by increasing to subtract closely spaced method.
Therefore, in the magnetizing assembly 300 of this example, transfer chip 304 by arranging between magnetization salient pole 306b and magnetic material 400, suppress to drive the bias with magnetic pole.
In addition, transfer an end of chip 304 free by making, compare with the situation that the two ends of transferring chip 304 are fixed, transfer more freely bending of chip 304, can further alleviate the gap secund between the magnetic material 400 that magnetizes salient pole 306b and conduct magnetization object.
When transferring chip to be formed as the high material of magnetic material that magnetizes object by hardness ratio, its inner surface 40a is produced scratch.If on the cylinder-shaped magnet 40 after magnetization, scuffing is arranged, even little impact also might produce cracking.
For this reason, in this example, transfer chip 304 to be made by the more soft material of magnetic material that magnetizes object than the conduct of imagination, more soft than this magnetic material.Such as, can be made by uncommon great soil group materials such as neodymium, iron, boron as the magnetic material of magnetization object, and transfer chip 304 to be consisted of by the material that comprises polyimide resin or mylar.Its result can reduce the cylinder-shaped magnet 40 that scratches after magnetizing.
In addition, 4 accent chips 304 are seen on the whole can be described as and are divided into 4 OBL parts.By forming oblong-shaped, transfer chip 304 to be not easy in the end face 312 of magnetization salient pole 306b and the gap as the inner surface 40a of the magnetic material of magnetization object wrinkling.Because if produce so wrinklingly, be difficult to magnetic material is installed to magnetizing assembly 300.
If be equal to or greater than along circumferential radius of curvature of end face of each magnetization salient pole the radius of a circle that the end face with a plurality of magnetization salient poles joins, it is large that the insertion resistance when magnetic material being inserted magnetizing assembly becomes, and workability might descend.For this reason, in this example, it is less than the radius of a circle (D0/2) that the end face 312 with 8 magnetization salient pole 306b joins along the circumferential radius of curvature R of its end face 312 that each magnetizes salient pole 306b.Thus, the contact area that can reduce magnetization salient pole 306b and transfer chip 304 can reduce the insertion resistance.Its result makes operation become easier.
When the magnetization of repeatedly carrying out continuously by magnetizing assembly 300, due to the copper loss of magnetizing coil 302 and the iron loss of magnetization salient pole 306b, the temperature of magnetizing assembly 300 rises.If the temperature of magnetizing assembly 300 rises, transfer chip 304 softening, flexibility decrease.Further rise as temperature, transfer chip 304 to melt.
For this reason, in this example, transfer chip 304 to be designed to have elasticity when the maximum operation (service) temperature of predefined magnetizing assembly 300.For example, when the maximum operation (service) temperature of setting magnetizing assembly 300 is 80 ℃, transfer chip 304 to form by also having flexible material at 80 ℃.For example, polyimide resin or mylar satisfy this condition.Its result even the temperature of magnetizing assembly 300 rises, transfers chip 304 also can keep necessary elasticity.
In addition, in the magnetization operation, electric current that also can be when setting the time interval respectively magnetize operation or magnetization makes the temperature of magnetizing assembly 300 below predefined maximum operation (service) temperature.For example, when the maximum operation (service) temperature of setting magnetizing assembly 300 is 80 ℃, can adjust the time interval of respectively magnetizing operation, make it be no more than this temperature.As setting the time interval of each magnetization operation long, be conducive to keep the temperature of magnetizing assembly 300 lower, as setting the time interval of each magnetization operation short, be conducive to increase work efficiency.In addition, the electric current in when magnetization is diminished, the temperature of magnetizing assembly 300 can be remained lower, and if the electric current when increasing magnetization is conducive to increase the magnetic flux that drives with magnetic pole.In order to ensure the serviceability temperature of desirable magnetizing assembly 300 and the desirable driving condition with the magnetic flux of magnetic pole, the electric current in the time of each can being magnetized time interval of operation and magnetization is tried to achieve by test as parameter.
In addition, in the magnetization operation, one side also can by cooling magnetization the in one side, the temperature of magnetizing assembly 300 be remained on below maximum operation (service) temperature.For example, can be on one side 300 blow air and magnetize on one side from air-supply arrangement not shown in the figures to magnetizing assembly.At this moment, be inhibited because the temperature of magnetizing assembly 300 rises, the time interval of respectively magnetizing operation shortened, thereby can increase work efficiency.In addition, it is large that the electric current in the time of can making magnetization becomes, thereby increase the magnetic flux that drives with magnetic pole.
Formation and the action of above magnetizing assembly 300 to example are illustrated.These examples are example, and the combination of these each inscapes can produce various variation, such variation also within the scope of the invention, this point is understandable for a person skilled in the art.
In example, as transferring core element, be illustrated for the laminar accent chip 304 of rectangle, but be not limited to this.For example, as the sub of transferring chip 304, magnetizing assembly can have is formed by the material same with transferring chip 304, the cross section is to justify or the rod type element of elliptical shape.This rod type element can be configured between adjacent magnetization salient pole 306b.In addition, this rod type element can be also hollow component.At this moment, at thickness direction, can easily adjust to desirable spring rate.
Fig. 6 means the front view of the magnetizing assembly 500 of variation.Fig. 7 is the cutaway view of the C-C line of Fig. 6.Magnetizing assembly 500 has magnetizing coil 302,4 rod type elements 504, yoke, magnetization substrate 308, installing component 510.
The shape of each rod type element 504 is, is that flat ratio is the elliptical shape of 20% left and right in the cross section (cross section shown in Figure 7) of the direction vertical with length direction.The long axis that each rod type element 504 is arranged to its cross section is circumferential.Installing component 510 is configured in mode between adjacent magnetization salient pole 306b with the 504a of Central Line of the short-axis direction of each rod type element 504, an end of each rod type element 504 is fixedly connected with the top of the 306a of section.The other end of each rod type element 504 becomes free end.
Along the major axis D2 in the cross section of each rod type element 504, namely the circumferential width of rod type element 504 is larger than the interval D 3 between adjacent magnetization salient pole 306b.Therefore, when on magnetizing assembly 500, magnetic material 400 being installed, 4 rod type elements 504 are arranged between 8 magnetization salient pole 306b and the inner surface 40a as the magnetic material 400 that magnetizes object.Each rod type element 504 covers at least a portion of the end face 312 of corresponding magnetization salient pole 306b.
In addition, when inserting magnetic material 400, compare with the accent chip 304 of example, be shaped as rod type element 504 be not easy wrinkling.The maximum curvature radius in the cross section of each rod type element 504 is less than the radius of a circle (D0/2) that the end face 312 with 8 magnetization salient pole 306b joins, thereby can reduce the contact area of rod type element 504 and magnetic material 400.
In example, when seeing from the top 4 to transfer chips 304 be that situation about being arranged on symmetrically on yoke is illustrated with respect to magnetic field center O, but be not limited thereto.For example, also at least one pair of can be transferred chip to be arranged to symmetrical with respect to the magnetic field center in the design of magnetizing assembly.For example, the accent chip of H (H is the integer more than 2) piece can be arranged to become symmetrically form with respect to magnetic field center, or transfer chip to be arranged to become with respect to the plane that comprises symmetry axis S the form of face symmetry polylith.Thus, with example similarly, can make the interval between magnetization salient pole and magnetic material impartial, can reduce magnetic pole bias.
In addition, the accent chip more than 3 along the state that circumferentially equally spaced configures, is compared with states of unequal interval installation with these being transferred chips, can be alleviated the biasing of magnetic material.
The disk drive 100 of the cylinder-shaped magnet 40 of making as the magnetizing assembly 300 that carry to use example, the one-piece type disk drive that can support turntable to base plate is illustrated with rotating freely, but is not limited thereto.For example, can make the brushless electric machine of the cylinder-shaped magnet that carries magnetizing assembly 300 formation of using example, this brushless electric machine is installed to the chassis of hard disk drive.
The disk drive 100 of the cylinder-shaped magnet 40 that forms as the magnetizing assembly 300 that carry to use example, to magnet be positioned at laminated core the outside, be that the disk drive of outer-rotor type is illustrated, but be not limited to this.Such as, when making magnet and be positioned at the magnet of the inboard, disk drive so-called inner-rotor type of laminated core, also can be suitable for the technological thought of example.
The disk drive 100 of the cylinder-shaped magnet 40 that forms is fixed on base plate, axle to sleeve to be illustrated with respect to the disk drive of sleeve rotating, but is not limited to this as carrying the magnetizing assembly 300 that uses example.Such as, for the fixed shaft type disk drive that axle is fixed on base plate, sleeve rotates with respect to axle, also can carry the cylinder-shaped magnet 40 of magnetizing assembly 300 formation of using example together with turntable.
In example, be illustrated for the situation of using magnetizing assembly 300 in the manufacture process of the cylinder-shaped magnet that is mainly used in hard disk drive, but be not limited thereto.For example, also can make the brushless electric machine with the cylinder-shaped magnet that uses magnetizing assembly 300 manufacturings, this brushless electric machine is carried on the optical disk recording/playing devices such as CD (ComPact Disc) device, DVD (Digital Versatile Disc) device.
Abovely describe the present invention based on example, but example only means principle of the present invention and application thereof, for example, in the scope of the thought of the present invention that does not break away from the claim regulation, various deformation example or configuration change can be arranged.
Claims (16)
1. a magnetizing assembly, be used for magnetizing magnetic material cylindraceous, it is characterized in that having:
When described magnetic material is installed on this magnetizing assembly, with a plurality of salient poles of the relative configuration of magnetization object face of described magnetic material;
The connecting portion that connects described a plurality of salient poles;
Be arranged between described a plurality of salient pole and described magnetization object face, for the accent core element of the position relationship of adjusting described a plurality of salient pole and described magnetic material,
Described accent core element comprises the accent chip of being made by elastomeric material;
If be D0(mm with described a plurality of salient poles, diameter of a circle that join with the end of the relative configuration of described magnetization object face), the diameter of described magnetization object face is D1(mm) time, the thickness t of described accent chip (mm) satisfies following equation
2. magnetizing assembly as claimed in claim 1, it is characterized in that: described accent core element is formed by elastomeric material;
Described accent core element covers at least a portion of at least one salient pole, relative with the described magnetization object face face in described a plurality of salient poles.
3. magnetizing assembly as claimed in claim 1, it is characterized in that: described accent core element comprises a plurality of rectangle parts, described a plurality of rectangle parts are along the circumferential arranged spaced to set.
4. magnetizing assembly as claimed in claim 2, it is characterized in that: described accent core element comprises a plurality of rectangle parts, described a plurality of rectangle parts are along the circumferential arranged spaced to set.
5. magnetizing assembly as claimed in claim 1, it is characterized in that: an end of described accent core element is free end.
6. magnetizing assembly as claimed in claim 2, it is characterized in that: an end of described accent core element is free end.
7. magnetizing assembly as claimed in claim 3, it is characterized in that: an end of described accent core element is free end.
8. magnetizing assembly as claimed in claim 4, it is characterized in that: an end of described accent core element is free end.
9. magnetizing assembly as described in any one in claim 1 to 8, it is characterized in that: described accent core element is made by the material gentleer than described magnetic material.
10. magnetizing assembly as described in any one in claim 1 to 8, it is characterized in that: described accent core element is that more than 0.1, the material below 0.6 is made by the coefficient of kinetic friction of described accent core element and described magnetic material.
11. magnetizing assembly as claimed in claim 9 is characterized in that: described accent core element is that more than 0.1, the material below 0.6 is made by the coefficient of kinetic friction of described accent core element and described magnetic material.
12. magnetizing assembly as described in any one in claim 1 to 8, it is characterized in that: along each salient pole, with the circumferential radius of curvature of the end of the relative configuration of described magnetization object face, than with described a plurality of salient poles, radius of a circle that join with the end of the relative configuration of described magnetization object face is little.
13. magnetizing assembly as claimed in claim 9, it is characterized in that: along each salient pole, with the circumferential radius of curvature of the end of the relative configuration of described magnetization object face, than with described a plurality of salient poles, radius of a circle that join with the end of the relative configuration of described magnetization object face is little.
14. magnetizing assembly as claimed in claim 10, it is characterized in that: along each salient pole, with the circumferential radius of curvature of the end of the relative configuration of described magnetization object face, than with described a plurality of salient poles, radius of a circle that join with the end of the relative configuration of described magnetization object face is little.
15. magnetizing assembly as claimed in claim 11, it is characterized in that: along each salient pole, with the circumferential radius of curvature of the end of the relative configuration of described magnetization object face, than with described a plurality of salient poles, radius of a circle that join with the end of the relative configuration of described magnetization object face is little.
16. the manufacture method of a slewing comprises:
Right to use requires the described magnetizing assembly of any one in 1 to 15, and magnetic material cylindraceous is carried out magnetized operation;
The operation that the magnetic material that is magnetized is assembled as magnet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-037709 | 2010-02-23 | ||
| JP2010037709A JP5553641B2 (en) | 2010-02-23 | 2010-02-23 | Magnetizing apparatus and method for manufacturing rotating device |
Publications (2)
| Publication Number | Publication Date |
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| CN102163891A CN102163891A (en) | 2011-08-24 |
| CN102163891B true CN102163891B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110042940 Expired - Fee Related CN102163891B (en) | 2010-02-23 | 2011-02-22 | Magnetization device, slewing device and manufacture method of slewing device |
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| Country | Link |
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| JP (1) | JP5553641B2 (en) |
| CN (1) | CN102163891B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101556214B1 (en) | 2014-03-28 | 2015-09-30 | (주)대한특수금속 | Magnetizing yoke device with cooling system |
| BR102015020792A2 (en) * | 2015-08-27 | 2017-03-01 | Whirlpool Sa | device and process for electric motor rotor magnetization |
| CN107393679B (en) * | 2017-07-28 | 2020-04-28 | 始兴县标准微型马达有限公司 | Miniature direct current motor subassembly that magnetizes |
| CN115662730A (en) * | 2022-11-11 | 2023-01-31 | 广东光速动力设备制造有限公司 | Single-peak multi-pole magnetizing method in ring and hub motor rotor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200729A (en) * | 1989-08-29 | 1993-04-06 | Yamamoto Electric Corporation | Permanent magnet and magnetization apparatus for producing the permanent magnet |
| CN1209675A (en) * | 1997-06-27 | 1999-03-03 | 松下电器产业株式会社 | Magnitizing method for permanent-magnet machine |
| US6080352A (en) * | 1994-07-11 | 2000-06-27 | Seagate Technologies, Inc. | Method of magnetizing a ring-shaped magnet |
| CN101086914A (en) * | 2006-04-26 | 2007-12-12 | 日本胜利株式会社 | Magnetization method for magnet, motor and manufacturing method for motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63202007A (en) * | 1987-02-18 | 1988-08-22 | Fanuc Ltd | Magnetizing apparatus |
| JP2003017323A (en) * | 2001-06-29 | 2003-01-17 | Matsushita Electric Ind Co Ltd | Magnetization yoke |
| JP2006340430A (en) * | 2005-05-31 | 2006-12-14 | Matsushita Electric Ind Co Ltd | Device and method for magnetizing brushless motor |
-
2010
- 2010-02-23 JP JP2010037709A patent/JP5553641B2/en not_active Expired - Fee Related
-
2011
- 2011-02-22 CN CN 201110042940 patent/CN102163891B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5200729A (en) * | 1989-08-29 | 1993-04-06 | Yamamoto Electric Corporation | Permanent magnet and magnetization apparatus for producing the permanent magnet |
| US6080352A (en) * | 1994-07-11 | 2000-06-27 | Seagate Technologies, Inc. | Method of magnetizing a ring-shaped magnet |
| CN1209675A (en) * | 1997-06-27 | 1999-03-03 | 松下电器产业株式会社 | Magnitizing method for permanent-magnet machine |
| CN101086914A (en) * | 2006-04-26 | 2007-12-12 | 日本胜利株式会社 | Magnetization method for magnet, motor and manufacturing method for motor |
Non-Patent Citations (1)
| Title |
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| JP特开2006-340430A 2006.12.14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011176916A (en) | 2011-09-08 |
| JP5553641B2 (en) | 2014-07-16 |
| CN102163891A (en) | 2011-08-24 |
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