CN1302373A - Method of correcting rotational unbalance of rotating mechanism and correcting device of the same - Google Patents
Method of correcting rotational unbalance of rotating mechanism and correcting device of the same Download PDFInfo
- Publication number
- CN1302373A CN1302373A CN00800635A CN00800635A CN1302373A CN 1302373 A CN1302373 A CN 1302373A CN 00800635 A CN00800635 A CN 00800635A CN 00800635 A CN00800635 A CN 00800635A CN 1302373 A CN1302373 A CN 1302373A
- Authority
- CN
- China
- Prior art keywords
- unbalance
- rotating mechanism
- projection
- rotation
- correcting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005452 bending Methods 0.000 claims description 12
- 230000005855 radiation Effects 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 4
- 238000011109 contamination Methods 0.000 abstract 1
- 230000005484 gravity Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 230000001915 proofreading effect Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 235000012489 doughnuts Nutrition 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/30—Compensating imbalance
- G01M1/36—Compensating imbalance by adjusting position of masses built-in the body to be tested
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacture Of Motors, Generators (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Testing Of Balance (AREA)
- Rotational Drive Of Disk (AREA)
Abstract
A method of correcting rotational unbalance of a rotating mechanism in, e.g. a hard-disc-driving apparatus, and a rotational unbalance correcting device. A disc-shaped plate has plural protrusions arranged equiangularly on the outer wall of the plate, and the protrusions radiate from the outer wall. The plate is mounted fixedly and coaxially to a rotating mechanism, i.e. a hub including hard discs having been fixed thereto. At least one of the protrusions is bent inward of the plate responsive to rotational unbalance of the rotating mechanism thereby achieving balance. This simple structure can correct unbalance of the rotating mechanism by simple work and free from contamination.
Description
The present invention relates to a kind of means for correcting of proofreading and correct the unbalance method of rotation in the rotating mechanism and this method of use.For example, be used for the spindle motor of hard disk drive, the generation rotation is unbalance when being installed to electric machine rotational axis at assembling motor or disk.Means for correcting is used to regulate this unbalance.
Fig. 8 is the skeleton view of the hard disk drive structure of routine.
Stacked and one or more dishes 311 are installed equally spacedly at central shaft 321 places that spindle motor drives.Magnetic head 319 is movably arranged on the one-sided or bilateral of dish 311.Magnetic head 319 is placed in the top of rotor actuator 318, and an element-coil 320 of voice coil motor is set on rotor actuator 318.Being rotated in of spindle motor produces one air-flow between dish 311 side and the magnetic head 319, magnetic head 319 is slightly floated from coiling 311 side.
Voice coil motor drives magnetic head 319 around pivot 322 rotations and at the dish 311 that radially moves up, and magnetic head 319 is read or record data.The distance that magnetic head 319 floats from dish is in the scope of tens nanometer～hundreds of nanometers.Magnetic head 319 and the dust that coils between 311 will damage magnetic head 319 and dish 311.Therefore, in the room of a cleaning, assemble hard disk drive, then with lid 317 these devices of sealing.The hard disk drive of Zhi Zaoing comprises that each size of component sum of errors installs the error that these elements bring thus.These errors make the center of gravity of the rotating element that comprises dish and the center misalignment of turning axle, produce unbalance in the rotation thus.The unbalance generation vibration of this rotation makes magnetic head follow the tracks of the lower and increase noise of fidelity of data-track on the disk.When this device being combined in the computer hardware, will produce adverse influence to other facility in the computer hardware by the unbalance problem that causes of rotation as a peripheral storage device.
Fig. 9 is a kind of conventional cross-sectional view when proofreading and correct the unbalance device of rotating mechanism rotation and being used for hard disk drive.
With reference to Fig. 9 the basic structure of the spindle motor that is installed to this hard disk drive is described.This spindle motor is a kind of stationary shaft type.Axle 304 rotation centers as motor are fixed to pedestal 301.Axle 304 extends through the inwall 3051 of bearing 305 annular inner portion, and the inwall 3062 of column central shaft 306 is assembled on the outer wall 3052 of bearing 305 outer ring portion.Central shaft 306 can rotate around axle 304 thus, and central shaft 306 itself is a turning axle of spindle motor.
The outer wall 3071 of annular rear magnetic yoke 307 is assembled in the inwall 3081, i.e. the bottom of central shaft 306, and the outer wall 3081 of ring-shaped rotor magnets is assembled in the inwall 3072 of rear magnetic yoke 307 regularly.Stator core 302 coaxially is fixed to pedestal 301 with axle 304, and right through the internal face of annular space and magnet 308.Stator core 302 winding arounds 303.When giving coil 303 power supplies, magnet 308, yoke 307 and stator core 302 produce magnetic field, drive motor.Yoke 307 can be cancelled, and the outer wall 3081 that is changed by ring-shaped rotor magnets 308 directly is fixed to the inwall 3063 of central shaft 306.In this case, central shaft 306 encourages the function of spindle motor also as a rear magnetic yoke.
The rotating mechanism of motor places its center of gravity on the turning axle in theory; But in fact because each size of component sum of errors error that these elements are installed, center of gravity is not always to overlap with turning axle.Consequently rotate unbalance.
Next with reference to Fig. 9 the unbalance bearing calibration of a kind of spindle motor rotation is described.
The rotor portion assembling of spindle motor is as follows: central shaft 306 rotations are installed to axle 30, and rotor magnet 307 grades are installed to central shaft 306.
The rotation of measuring rotor portion then is unbalance, and at least a counterweight 309 is inserted in a plurality of adjustment holes 3061 that are formed on the central shaft 306.The hole 3061 that is used to receive counterweight 309 distributes to unbalance position (being center of gravity) about turning axle or symmetrically near symmetric position.Axle 304 is fixed to pedestal 301 then.
In the method, adjustment hole 3061 is formed on the donut of turning axle with the interval of rule, therefore, can proofread and correct any unbalance position.Counterweight 309 has polytype and different weight, therefore can handle any unbalance.Counterweight 309 can be fixing by bonding, or be inserted in the elastically-deformable adjustment hole 3061, and can act on the friction force that hole 3061 produces by elastic force and fix.
The fixed shaft type spindle motor more than has been discussed; Also can be but proofread and correct unbalance conventional method by on rotor portion, forming the type that adjustment hole is applied to the axle rotation in advance.
Figure 10 is the cross-sectional view that is used for the unbalance means for correcting of rotation of hard disk drive.This is to be used for proofreading and correct the unbalance another kind of conventional equipment of rotation that the assembling at motor and dish produces.
Spindle motor has and structure identical shown in Fig. 9.More particularly, three dishes 311 are settled on regular intervals ground on central shaft 306, and spacer-disc is arranged therebetween.Make dish 313 clampings in the hole 3064 and dish 311 is fixed to central shaft 306 by screw 314 is screwed into.Then dish 311 is rotatably fixed to the central shaft 306 that also is used as the spindle motor turning axle, and with central shaft 306 rotations.
Be described proofreading and correct the unbalance conventional method of spindle motor rotation with reference to Figure 10.
The rotor portion assembling of spindle motor is as follows: central shaft 306 rotations are arranged to axle, and rotor magnet etc. are arranged to central shaft 306.Coil 311 then and be arranged to central shaft 306.
Measurement comprises that the rotor portion rotation of dish is unbalance, and inserts a counterweight 309 in a plurality of adjustment holes 3061 on being formed at central shaft 306 at least.The hole 3061 that is used to receive counterweight 309 is symmetrically located at unbalance position (being center of gravity) about turning axle or near symmetric position.
In the method, adjustment hole 3061 is formed on the donut of central shaft 306 in advance with the interval of rule, therefore, can proofread and correct any unbalance position.Counterweight 309 has polytype and different weight, therefore can handle any unbalance.Counterweight 309 can be fixing by bonding, or be inserted in the elastically-deformable adjustment hole 3061, and can be fixed by the friction force that elastic force promotes hole 3061 to produce.The mode of another kind of fixed weight is: make the counterweight 309 with a projection 3091 of being made by elastomer material such as rubber that elastic deformations take place and be inserted in the hole 3061, projection 3091 is placed between clamping disk(-sc) 313 and the central shaft 306, prevent counterweight 309 and from hole 3061, break away from owing to vibrate.
Figure 11 is the planimetric map that is used for the unbalance conventional equipment essential part of hard disk drive lieutenant colonel positive rotation.
Be described near the rotation center on the straight line that links rotation center 400 and rotating part center of gravity (unbalance position) 450 or near the method for this straight line reducing counterweight or mobile counterweight below.
In Figure 11, rotate unbalance means for correcting and comprise following elements:
Annulus part 310, have one therein the heart be assembled to the pilot hole 3103 of turning axle 316;
A plurality of support sections 3102 from annulus part 310 radiation profiles; With
Be formed on the counterweight part 3101 at each support section 3102 top.
Be used to rotate unbalance means for correcting coaxial and be fixed to rotatably the axle 316, be the rotary middle spindle of rotating part 311.Support section 3102 is made by the thermoplastic material of thermal shrinkage.Measurement comprises that the rotation of whole rotating part 311 of this means for correcting is unbalance, link on the straight line of rotation center 400 and unbalance position 450 with laser radiation then or near straight line support section 3102, make support section be heated and shrink.Consequently counterweight 3101 is to moving near rotation center.
Repeat this operation and be reduced to less than set-point, like this, proofreaied and correct unbalance up to unbalance.If not so, it is unbalance to proofread and correct to clip one section support section 3102 with laser beam, and in this case, support section 3102 needn't be made by the thermoplastic material of thermal shrinkage.
Means for correcting discussed above also has following point:
In that counterweight is inserted under the situation of adjustment hole, should on central shaft, form several holes so that handle any unbalance position.Mechanical rigid in the central shaft reduces thus, so that central shaft is subject to deformation, causes coiling excessive prying or fluctuating.In addition, it is any unbalance to deal with to prepare various types of counterweights, has improved the cost of device like this, has prolonged the time of selecting suitable counterweight, and owing to misplacing of counterweight rides for a fall.
Under the situation of fixed weight, the bonding agent that is used for fixing counterweight produces gas, and this gas will corrode magnetic head and disk.
Under the situation that elastically-deformable counterweight is inserted in the hole, need to operate meticulously, be held in a given shape as a counterweight of distortion, and be inserted in the given hole.So need spended time to regulate production equipment, and when inserting, cause error.
Alleviating counterweight or counterweight is being shifted under the situation of rotation center, following point can take place: made by special material by the support section of laser emission, improved cost like this, and be not easy to control the amount of contraction that produces by the heating support section.And clipping under the situation of support section at incision generation dust and gas.
The present invention has considered problem discussed above and will address these problems.
The present invention proofreaies and correct the unbalance method of rotating mechanism rotation and comprises the following steps:
Dished plate with a plurality of projectioies from its outer wall equal angles radiation profiles is arranged to regularly the rotary middle spindle of coaxial rotating mechanism; With
Unbalance corresponding to the rotating mechanism that comprises dished plate obtains the spin balancing of rotating mechanism by a projection of the dished plate that curves inwardly at least.
The unbalance means for correcting of a kind of rotation of rotating mechanism comprises following elements:
A fixing and coaxial dished plate that is installed to the rotary middle spindle of rotating mechanism; With
A plurality of equal angles settings and from the projection of the outer wall radiation profiles of described dish, described projection can bending in dish independently.
Above-mentioned bearing calibration of the present invention and means for correcting can be by any amount of following arrangement corrects and any position unbalance: when the assembling means for correcting, lobed dished plate is arranged to rotating mechanism, and in dished plate bend relief.The method and device do not have conventional method or device as boning and clipping the material produced pollution.Therefore, can proofread and correct unbalance by simple structure and operation.
Fig. 1 is the unbalance means for correcting cross-sectional view of rotation that is used in the rotating mechanism in the hard disk drive according to first embodiment of the invention;
Fig. 2 proofreaies and correct unbalance Weight plate skeleton view among first embodiment;
Fig. 3 is the planimetric map of Weight plate shown in Figure 2;
Fig. 4 A and 4B are that the projection of Weight plate in the hard disk drive of first embodiment and the position between the magnetic head concern cross-sectional view;
Fig. 5 is the unbalance means for correcting cross-sectional view of rotation that is used in the rotating mechanism in the hard disk drive according to second embodiment of the invention;
Fig. 6 is the Weight plate planimetric map that is used in the third embodiment of the invention;
Fig. 7 A is the unbalance means for correcting cross-sectional view of rotation that is used in the rotating mechanism in the hard disk drive according to fourth embodiment of the invention;
Fig. 7 B is used for proofreading and correct the sunk part enlarged drawing that unbalance Weight plate projection forms in the fourth embodiment of the invention;
Fig. 8 is the skeleton view of the hard disk drive of routine;
Fig. 9 is the conventional unbalance means for correcting sectional view of the rotation that is used for the hard disk drive rotating mechanism;
Figure 10 is the unbalance means for correcting sectional view of the rotation that is used for the hard disk drive rotating mechanism of another routine;
Figure 11 is the conventional essential part planimetric map that is used for the unbalance means for correcting of hard disk drive rotation.
Below with reference to accompanying drawing embodiments of the invention are illustrated.
(embodiment 1)
Fig. 1 is the unbalance means for correcting cross-sectional view of rotation that is used in the rotating mechanism in the hard disk drive according to first embodiment of the invention.Fig. 2 proofreaies and correct unbalance Weight plate skeleton view among first embodiment.Fig. 3 is the planimetric map of Weight plate shown in Figure 2.Fig. 4 A and 4B are that the projection of Weight plate in the hard disk drive of first embodiment and the position between the magnetic head concern cross-sectional view.
In Fig. 1, spindle motor has roughly similar structure to the conventional spindle motor shown in Figure 10, except these points: in first embodiment, clamping disk(-sc) 13 is set, three dishes 11 are clamped in central shaft 6, between each dish two spacer-discs 12 are arranged.
Place at the top of clamping disk(-sc) 13 and to be used to proofread and correct unbalance plate-like Weight plate 15, and the screw 14 that is used to tighten clamping disk(-sc) is fixed to central shaft 6 to this Weight plate 15 with clamping disk(-sc) 13.Weight plate 15 coaxially is fixed to central shaft 6, is the turning axle of spindle motor thus, and dish 15 can be rotated around axle 4.
After dish was assembled into motor, the rotation of measuring this assembling was unbalance.Inwardly curved at least one projection 151 then, and make it at the straight-line segment that links rotation center and center of gravity or around this line segment elastic deformation, unbalance to proofread and correct.
Describe Weight plate 15 in detail below with reference to Fig. 2 and Fig. 3.
Next, illustrate the unbalance method of rotation of proofreading and correct.
About the planimetric position of Weight plate 15 when assembling, dish 15 is by being inserted into conjugate foramen 156 to axle 4 and the coaxial subassembly that is installed to motor and dish.Therefore, because the error due to the difference of the distance between the rotation center and any protruding 151 is a negligible very little amount, and any lobe 151 all will draw identical correcting value.As in the location of sense of rotation of when assembling Weight plate 15, as shown in Figure 3, the straight-line segment 250 between two pilot holes 155 is as a datum line, and determines the angle 200 that datum line 250 is thus become with each projection 151.Therefore, unbalance correction not by the defective due to the leakage choosing of bend relief and error and since on projection the defective due to the misplacing of bending fixture.The result be can accurately proofread and correct unbalance.Simultaneously, Weight plate 15 is finalized the design about axial symmetry, and itself does not have unbalance.
About the projection 151 of Weight plate 15, from the rotation center larger distance or when being raised with bigger quality unbalance recoverable amount increase.On the contrary, from the short distance of rotation center or when being raised with less quality unbalance recoverable amount reduce, so unbalance can meticulously the adjusting.Projection 151 quality according to design and the aspect of assembling and unbalance specific amount etc. can cause maximum unbalance come definite best.
Fig. 4 A and 4B represent according to the projection 151 of first embodiment and the relation of the position between the magnetic head 19.About coiling the space between 11 and protruding 151, if projection 151 is because limitation in height influences magnetic head 19, then at the top 153 of radially shortening projection, feasible projection 151 does not influence magnetic head 19, shown in the arrow among Fig. 4 A.Each projection 151 can be bent upwards a given length, shown in Fig. 4 B so that widen top 153 and the dish between the space.
Like this, Weight plate 15 has certain dirigibility in Machine Design, maximum unbalance position and the quality of coming regulation projection 151 that it can cause according to design and assembling aspect and unbalance specific amount etc.In first embodiment, adopt the spindle motor of fixed shaft type; But the rotary-type spindle motor of axle has same effect.
(embodiment 2)
Fig. 5 is the unbalance means for correcting cross-sectional view of rotation that is used in the rotating mechanism in the hard disk drive according to second embodiment of the invention.
In according to the unbalance means for correcting of the rotation of aforesaid first embodiment, if the sweep of projection 151 disperses, then correcting value also disperses, and can not proofread and correct unbalance as guaranteeing.Usually, BENDING PROCESS is used for determining by anchor clamps are attached to where part should be implemented on the crooked element.
In Fig. 5, projection 151 root 152 has the thickness that is thinner than top 153, and the thickness of root 152 is the thinnest in the middle of other position, makes root 152 have minimum bending stiffness.Therefore, the amount of bow that is implemented into protruding 151 any parts causes root 152 bendings, and need not to utilize the anchor clamps that are attached to projection.As a result, can proofread and correct unbalance with stable manner error freely.
(embodiment 3)
Fig. 6 is the Weight plate planimetric map that is used in the third embodiment of the invention.
In Fig. 6, in order to disperse the position at bend relief 151 places that alleviate Weight plate 15, the root 152 of projection 151 has a width narrower than top 153, and the width of root 152 is the narrowest in other position of projection 151.Therefore, root 152 has minimum bending stiffness, and the amount of bow that is implemented into projection 151 any positions causes root 152 bendings.As a result, can proofread and correct unbalance with stable manner error freely.The shape of projection 151 can be made at least and form a depression in a side of root 152.
(embodiment 4)
Fig. 7 A is the unbalance means for correcting cross-sectional view of rotation that is used in the rotating mechanism in the hard disk drive according to fourth embodiment of the invention.Fig. 7 B is the sunk part enlarged drawing that is used to form in the fourth embodiment of the invention in proofreading and correct unbalance Weight plate projection.
Usually, BENDING PROCESS limit to expand and shrinks, and the two all determines the border by the neutral line, and the thin metal powder of material production that ruptures because of extension.In hard disk drive, this powder can damage magnetic head and disk.Therefore, Weight plate 15 must be with a kind of metal that very big extension can be arranged before fracture; But the shape permission dish 15 shown in Fig. 7 A and 7B stands to break, thus broadening the range of choice of material.
In other words, be preferably in depression that the cross section is an arc or an oval-shaped part of back side formation of protruding 151 sweeps.Root 152 elongations that this structure allows original length 271 to be bent, so and projection 151 very little extension is arranged.Owing to form this depression, can select the material that is easier to damage, and when projection is made by identical materials, there is the projection of this depression more to be difficult for breaking also thereby produces less metal powder.As a result, the projection with depression reaches higher reliability.
The unbalance means for correcting of the rotation of aforesaid rotating mechanism of the present invention can be unbalance by the rotation of any position of following configuration process and any amount: when the assembling means for correcting, lobed invention dish is arranged to rotating mechanism, and corresponding to the unbalance projection that curves inwardly of rotation.This simple structure is not owing to bonding and clip the material produced pollution, and can realize unbalance correction by operating simply.
Industrial applicibility
The inventive example is as can be used for the spin balancing of hard disk drive and implement device rotating mechanism. Tool Have a plurality of equal angles settings and from the dished plate of its outer wall projection radially regularly with the revolving of mechanism Turn to central shaft and coaxially be installed to rotating mechanism, such as central shaft. Corresponding to the rotating mechanism that comprises dished plate Unbalance, at least one projection is crooked in the dished plate, thus it is unbalance to regulate rotation. This simple structure Can be by simply, contamination-freely the operation adjustment rotating mechanism be unbalance.
Claims (9)
1. proofread and correct the unbalance method of rotating mechanism rotation for one kind, comprising:
On coaxial dished plate, as to be fixedly secured to this rotating mechanism rotary middle spindle, the projection that described dished plate has a plurality of equal angles settings and disperses from its outer wall; With
Unbalance corresponding to the rotating mechanism that comprises dished plate realized the spin balancing of rotating mechanism by a projection of the dished plate that curves inwardly at least.
2. the unbalance method of correction rotating mechanism rotation as claimed in claim 1 is characterized in that bending step comprises a position that is bent to form on projection, and this position is compared with other position on the projection and is easy to bending.
3. the unbalance method of correction rotating mechanism rotation as claimed in claim 1 is characterized in that bending step comprises a crooked sunk part that is formed on the back side, flexible position of projection.
4. the unbalance means for correcting of the rotation of a rotating mechanism comprises:
A fixing and coaxial dished plate that is installed to the rotary middle spindle of rotating mechanism; With
A plurality of equal angles settings and from the projection of the outer wall radiation profiles of described dish, described projection can bending in dish independently.
5. the unbalance means for correcting of rotation as claimed in claim 4 is characterized in that, is formed with to be easy to crooked position on described projection.
6. the unbalance means for correcting of rotation as claimed in claim 4 is characterized in that, is formed with a depression at the back side at the flexible position of projection.
7. the unbalance means for correcting of rotation as claimed in claim 4 is characterized in that described rotating mechanism comprises:
One by motor-driven central shaft; With
A dish that is fixedly installed to central shaft by described dished plate.
8. the unbalance means for correcting of rotation as claimed in claim 7 is characterized in that, forms to be easy to crooked position on described projection.
9. the unbalance means for correcting of rotation as claimed in claim 7 is characterized in that, forms a depression at the back side at the flexible position of projection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11119458A JP2000310290A (en) | 1999-04-27 | 1999-04-27 | Rotation balance correction method of rotator and correction device |
| JP119458/1999 | 1999-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1302373A true CN1302373A (en) | 2001-07-04 |
Family
ID=14761875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00800635A Pending CN1302373A (en) | 1999-04-27 | 2000-04-18 | Method of correcting rotational unbalance of rotating mechanism and correcting device of the same |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2000310290A (en) |
| KR (1) | KR20010053214A (en) |
| CN (1) | CN1302373A (en) |
| ID (1) | ID27090A (en) |
| TW (1) | TW522378B (en) |
| WO (1) | WO2000065323A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043069A (en) * | 2010-11-26 | 2011-05-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Angular impact table |
| CN104137693A (en) * | 2013-05-10 | 2014-11-12 | 宝时得机械（张家港）有限公司 | Grass trimmer wire spool and winding method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6189021B2 (en) | 2012-07-17 | 2017-08-30 | 株式会社浅野歯車工作所 | Impeller rotating body and rotating body |
| DE102016214722A1 (en) * | 2016-08-09 | 2018-02-15 | Bayerische Motoren Werke Aktiengesellschaft | body of revolution |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU438895A1 (en) * | 1972-03-16 | 1974-08-05 | Каунасский Политехнический Институт | Load balancing |
| FR2562248B1 (en) * | 1984-04-02 | 1988-04-22 | Sfim | METHOD AND DEVICE FOR BALANCING THE SHAFT LINE OF A GYROSCOPE |
-
1999
- 1999-04-27 JP JP11119458A patent/JP2000310290A/en active Pending
-
2000
- 2000-04-18 ID IDW20002700A patent/ID27090A/en unknown
- 2000-04-18 KR KR1020007014819A patent/KR20010053214A/en not_active Application Discontinuation
- 2000-04-18 CN CN00800635A patent/CN1302373A/en active Pending
- 2000-04-18 WO PCT/JP2000/002501 patent/WO2000065323A1/en not_active Application Discontinuation
- 2000-04-26 TW TW089107883A patent/TW522378B/en active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043069A (en) * | 2010-11-26 | 2011-05-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Angular impact table |
| CN102043069B (en) * | 2010-11-26 | 2012-05-09 | 中国航空工业集团公司北京长城计量测试技术研究所 | Angular impact table |
| CN104137693A (en) * | 2013-05-10 | 2014-11-12 | 宝时得机械（张家港）有限公司 | Grass trimmer wire spool and winding method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000065323A1 (en) | 2000-11-02 |
| ID27090A (en) | 2001-03-01 |
| JP2000310290A (en) | 2000-11-07 |
| KR20010053214A (en) | 2001-06-25 |
| TW522378B (en) | 2003-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0185946B1 (en) | Alternately centered disk pack assembly and method | |
| CN1783651A (en) | Rotor iron core of motor and small motor | |
| US5724718A (en) | Process for assembling a clamp ring to a disk stack assembly | |
| US20130033123A1 (en) | Theta z drive apparatus and stage apparatus | |
| KR20040043923A (en) | Disk balancing apparatus and method of hard disk drive | |
| US5572382A (en) | Magnetic disk drive having balanced magnetic disk mounted on rotor of motor | |
| US6554476B2 (en) | Dynamic pressure bearing device and method of manufacturing the same | |
| CN1302373A (en) | Method of correcting rotational unbalance of rotating mechanism and correcting device of the same | |
| JPH03283071A (en) | Disk recorder and method for using support member of the disk recorder | |
| CN1166049C (en) | Vibrating type driving device | |
| JPH08223858A (en) | Inner rotor motor | |
| CN1905316A (en) | Positioning structure between parts of different materials, and assembly structure of motor | |
| CN1684341A (en) | Electric motor | |
| CN1656551A (en) | Spindle motor | |
| JP5190792B2 (en) | Unbalance correction method and motor | |
| JPH06342578A (en) | Magnetic disk device and assembling method thereof | |
| CN1833346A (en) | Reluctance motor | |
| JP2009171725A (en) | Brushless motor | |
| CN1831992A (en) | Disk drive device | |
| US20110163639A1 (en) | Bearing holder and spindle motor having the same | |
| JP2008312337A (en) | Brushless motor | |
| JPH0637378Y2 (en) | Optical deflector | |
| CN1262546A (en) | Spindle motor | |
| KR100228177B1 (en) | Motor for driving disc having an advanced precision | |
| JPS59165282A (en) | Magnetic disc fixing mechanism |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |