CN1368727A - Antistatic technique for magnetically floating hard disk drive - Google Patents
Antistatic technique for magnetically floating hard disk drive Download PDFInfo
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- CN1368727A CN1368727A CN 02115474 CN02115474A CN1368727A CN 1368727 A CN1368727 A CN 1368727A CN 02115474 CN02115474 CN 02115474 CN 02115474 A CN02115474 A CN 02115474A CN 1368727 A CN1368727 A CN 1368727A
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Abstract
The invention relates to a technique for anti-static electricity of magnetic-suspension hard disk drive. The drive consists of magnetic-suspension rotor, displacement sensor, A/D, DSP, A/D and power amplifier. The rotor of hard disk drive is totally magnetic-suspended. magnetic bearing replaces the traditional bearing. There is a central hole on the principal axis, and there is an oil-wedge groove containing oil in the central hole. On end of needle for releasing static electricity is fixed on the magnetic-suspension rotor, and the other end is hung and immersed in a conduction liquid, forming a channel for releasing static electricity between the rotor and ground wire. The invention can safety release the static electricity caused by air friction, and the said needle does not affect the operation of the rotor and works stable so as to prevent the hard disk from interference of static electricity.
Description
Technical field
The present invention relates to the antistatic technique of a magnetically floating hard disk drive.
Background technology
Hard disk mainly is made up of hard disc, spindle motor, magnetic head driving mechanism and control circuit board etc.Drive the disc high speed rotating that is covered with recording medium by spindle motor, magnetic head drive mechanism magnetic head carries out data write simultaneously, and control circuit is then finished the control task of all machinery and data transmission.
In topmost several assembly CPU, video card, mainboard, internal memory and the hard disk, having only hard disk is to rely on mechanical system to carry out reading and writing data in the computer system, and the speed of mechanical system motion will be much more slowly than electronic system.Therefore, the read or write speed of hard disk becomes the bottleneck of further raising computer speed.Constantly double in hard-disk capacity, when cost constantly descended, its speed is not defeated by CPU or internal memory is the trend of hard disk development too much, and the rotating speed of therefore accelerating main shaft is necessary.
The effect of the height of hard disk speed in whole computer system is only second to CPU and internal memory.Improving the read or write speed of hard disk generally can set about from two aspects: the one, and the rotating speed of raising spindle motor; The 2nd, the buffer memory of increase hard disk.The applicant intends with magnetic levitation technology the hard disk rotor being suspended fully, replace traditional bearing with magnetic bearing, utilize displacement sensor to go out the displacement signal that rotor departs from reference point, convert control signal to, behind power amplifier, convert current signal again to, after the energising, magnetic bearing produces magnetic force, makes rotor be in the suspension equilibrium state at any time.After adopting the magnetically floating hard disk structure, the rotating speed of hard disk drive can improve significantly, but the disc of hard disk drive when high speed rotating with windage meeting generation static, the speed of electrostatic accumulation is proportional to the rotating speed of hard disc.If these static can not discharge quickly and effectively, static will discharge as positions such as magnetic head, sensors at the middle narrow and small position of system so.If static discharges by magnetic head, just might damage magnetic head or destroy data, reduce the correctness of reading and writing data; If static discharges by sensor, just might damage sensor and interferometry signal, and then the normal operation of EVAC (Evacuation Network Computer Model), reduce reliability of system operation.
Main shaft in the magnetically floating hard disk drive system and disc are to be suspended in fully in the air when work, without any the passage that can supply static to discharge.Therefore, work out release electrostatic safely and effectively, avoiding electrostatic interference is that the research and development magnetically floating hard disk drive at first will be dealt with problems.
Summary of the invention
The objective of the invention is at above-mentioned present situation, aim to provide a release electrostatic safely and effectively, avoid the antistatic technique of electrostatic interference magnetically floating hard disk drive.
Purpose implementation of the present invention is that the antistatic technique of magnetically floating hard disk drive includes magnetic head driving mechanism, control system, spindle motor 6, hard disc 1.Also include magnetic suspension rotor 2, displacement transducer 11, A/D, DSP, D/A and power amplifier.The magnetic bearing 5,7 that magnetic suspension rotor 2 is suspended is radial magnetic bearing, and magnetic bearing 9 is the axial magnetic bearing.There is center pit at the middle part of main shaft 10 or pedestal 8, and the oil film wedge groove is arranged in the center pit, and conductive liquid 4 is housed.Static discharges pin 3 one ends fixedlys connected with magnetic suspension rotor 2, and the other end then is immersed in the interior conductive liquid 4 of center pit vacantly, forms the static release channel between magnetic suspension rotor and ground wire.
The present invention does not change other mechanisms of former disc driver, just magnetic bearing is replaced traditional bearing.Having under the situation of electric current, magnetic bearing forms magnetic field, magnetic suspension rotor is in suspended state under the magnetic field force effect, and measure the displacement signal of magnetic suspension rotor with displacement transducer 11, by A/D, DSP, D/A and power amplifier, change, zoom into current signal, electric current produces electromagnetic force in magnetic bearing, make magnetic suspension rotor be in the suspension equilibrium state at any time.
Hard disk rotor and static discharge pin by the favorable conductive made, and outside dimension is less than 0.5mm.In the present invention, magnetic suspension rotor 2 and associated member thereof, destatic and discharge pin and outside conductive liquid contacts, miscellaneous part is all without any contact, again because static discharges the outside dimension of pin less than 0.5mm, so when rotating, even when the rotating speed of magnetic suspension rotor 2 reaches 40000r/min with magnetic suspension rotor 2, its linear velocity also only is 1m/s, therefore can not influence the suspended state of magnetically floating hard disk disc 1.And the electrostatic charge that hard disk when work produces can be discharged reliably by this channel security.
Conductive liquid can add the material with electric conductivity by lubricating oil to be formed, and its fundamental purpose is a conduct charges and lubricated.Requirement to conductive liquid is: electric conductivity is good, nontoxic, non-corrosiveness, not volatile, viscosity suitably are difficult for producing and splash or atomize.The material that is added should be easy to be dissolved in the lubricating oil, can not produce degraded and polyreaction with lubricating oil, can select polyglycol, polyoxy ethylenediamine, trimethylglycine, carbon black and graphite etc. for use.
Because it is very little that static discharges the external diameter of pin, for fear of produce additional stir oil or wearing and tearing because of its bending, in electric machine main shaft 10 center pits, designed a hydrodynamic bearing, its effect is when static discharges the pin rotation, form the pressure oil film and static is discharged the center that pin is pushed hydrodynamic bearing to, it is stable to guarantee that static discharges the center of pin, and its axle center drift amount is controlled at below the 1 μ m, and that avoids that static discharges pin additionally stirs oil and wearing and tearing.
Because the size of this hydrodynamic bearing is less, accuracy requirement is higher, so two kinds of method manufacturings of the general employing of bearing oil film wedge groove: a kind of is to discharge on the pin 3 at static to squeeze out the oil film wedge groove; Another kind is that the cylindrical of bearing holder (housing, cover) is worn into specific non-circular shape with special method for grinding, then bearing holder (housing, cover) is pressed in the electric machine main shaft center pit, relies on the distortion of bearing holder (housing, cover) to form the oil film wedge groove.
Motor of the present invention can adopt disc type electric machine 12 (seeing Fig. 3, Fig. 4) or radial motor 6 (seeing Fig. 2, Fig. 5), and magnetic suspension rotor can adopt wheel hub rotary (seeing Fig. 2, Fig. 3) or main axis rotation formula (seeing Fig. 4, Fig. 5).13 is that shell, 14 is ring flange among the figure.
The present invention can discharge the static in the magnetically floating hard disk drive system safely and effectively, avoids the reading and writing of electrostatic interference magnetically floating hard disk.
Description of drawings
Fig. 1 structural principle block diagram of the present invention
Fig. 2 the present invention adopts the structural representation of radial motor, the rotary magnetically floating hard disk drive of wheel hub
Fig. 3 the present invention adopts the structural representation of disc type electric machine, the rotary magnetically floating hard disk drive of wheel hub
Fig. 4 the present invention adopts the structural representation of disc type electric machine, main axis rotation formula magnetically floating hard disk drive
Fig. 5 the present invention adopts the structural representation of radial motor, main axis rotation formula magnetically floating hard disk drive
Claims (6)
1, the antistatic technique of magnetically floating hard disk drive, include the magnetic head driving mechanism, control system, spindle motor (6), hard disc (1), it is characterized in that also including magnetic suspension rotor (2), displacement transducer (11), A/D, DSP, D/A and power amplifier, the magnetic bearing (5 that magnetic suspension rotor (2) is suspended, 7) be radial magnetic bearing, magnetic bearing (9) is the axial magnetic bearing, there is center pit at the middle part of main shaft (10) or pedestal (8), the oil film wedge groove is arranged in the center pit, and conductive liquid (4) is housed, static discharges pin (3) one ends and fixedlys connected with magnetic suspension rotor (2), the other end then is immersed in the interior conductive liquid (4) of center pit vacantly, forms the static release channel between magnetic suspension rotor and ground wire.
2, antistatic technique according to claim 1 is characterized in that static discharges pin and made by the material with good electric conductivity, and its outside dimension is less than 0.5mm.
3, antistatic technique according to claim 1 is characterized in that conductive liquid (4) can add the material with electric conductivity by lubricating oil and form, and adopts polyglycol, polyoxy ethylenediamine, trimethylglycine or carbon black and graphite.
4, antistatic technique according to claim 1, it is characterized in that guaranteeing that static discharges the stable oil film wedge groove in center of pin, two kinds of method manufacturings of the general employing of oil film wedge groove, a kind of is to discharge on the pin at static to squeeze out the oil film wedge groove, another kind is that the cylindrical of bearing holder (housing, cover) is worn into specific non-circular shape with method for grinding, then bearing holder (housing, cover) is pressed in the electric machine main shaft center pit, relies on the distortion of bearing holder (housing, cover) to form the oil film wedge groove.
5, antistatic technique according to claim 1, its feature adopts the rotary or main axis rotation formula of wheel hub at magnetic suspension rotor.
6, antistatic technique according to claim 1 is characterized in that motor adopts disc type electric machine or hard disk radial motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021154740A CN1159716C (en) | 2002-01-28 | 2002-01-28 | Antistatic technique for magnetically floating hard disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021154740A CN1159716C (en) | 2002-01-28 | 2002-01-28 | Antistatic technique for magnetically floating hard disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1368727A true CN1368727A (en) | 2002-09-11 |
| CN1159716C CN1159716C (en) | 2004-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021154740A Expired - Fee Related CN1159716C (en) | 2002-01-28 | 2002-01-28 | Antistatic technique for magnetically floating hard disk drive |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364001C (en) * | 2004-11-02 | 2008-01-23 | 武汉理工大学 | Combined type magnetic suspension hard disk driver |
| CN100392767C (en) * | 2003-01-21 | 2008-06-04 | 武汉理工大学 | Magnetic suspension hard disc single free degree multi-function experiment platform |
| CN100392768C (en) * | 2003-01-21 | 2008-06-04 | 武汉理工大学 | Magnetic suspension hard disk single free degree property experiment platform |
| CN100414831C (en) * | 2004-06-10 | 2008-08-27 | 武汉理工大学 | DPS based intellectual high speed magnetic suspension control and digital power amplifying device |
| CN100511959C (en) * | 2004-06-10 | 2009-07-08 | 武汉理工大学 | DPS based intellectual high speed magnetic suspension control and analog power amplifying device |
| CN103064038A (en) * | 2013-01-03 | 2013-04-24 | 武汉理工大学 | Unidirection mixing magnetic levitation testing device |
| CN105873343A (en) * | 2016-01-29 | 2016-08-17 | 钟志强 | Frictional wear-free release electrostatic elimination method of mobile object to ground |
| WO2017128897A1 (en) * | 2016-01-29 | 2017-08-03 | 钟志强 | Electrostatic discharge and elimination method for a moving object free from friction and abrasion caused by ground |
| CN110266168A (en) * | 2019-07-02 | 2019-09-20 | 山东天瑞重工有限公司 | A kind of outer rotor magnetic suspension motor |
-
2002
- 2002-01-28 CN CNB021154740A patent/CN1159716C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392767C (en) * | 2003-01-21 | 2008-06-04 | 武汉理工大学 | Magnetic suspension hard disc single free degree multi-function experiment platform |
| CN100392768C (en) * | 2003-01-21 | 2008-06-04 | 武汉理工大学 | Magnetic suspension hard disk single free degree property experiment platform |
| CN100414831C (en) * | 2004-06-10 | 2008-08-27 | 武汉理工大学 | DPS based intellectual high speed magnetic suspension control and digital power amplifying device |
| CN100511959C (en) * | 2004-06-10 | 2009-07-08 | 武汉理工大学 | DPS based intellectual high speed magnetic suspension control and analog power amplifying device |
| CN100364001C (en) * | 2004-11-02 | 2008-01-23 | 武汉理工大学 | Combined type magnetic suspension hard disk driver |
| CN103064038A (en) * | 2013-01-03 | 2013-04-24 | 武汉理工大学 | Unidirection mixing magnetic levitation testing device |
| CN103064038B (en) * | 2013-01-03 | 2015-04-08 | 武汉理工大学 | Unidirection mixing magnetic levitation testing device |
| CN105873343A (en) * | 2016-01-29 | 2016-08-17 | 钟志强 | Frictional wear-free release electrostatic elimination method of mobile object to ground |
| WO2017128897A1 (en) * | 2016-01-29 | 2017-08-03 | 钟志强 | Electrostatic discharge and elimination method for a moving object free from friction and abrasion caused by ground |
| CN110266168A (en) * | 2019-07-02 | 2019-09-20 | 山东天瑞重工有限公司 | A kind of outer rotor magnetic suspension motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1159716C (en) | 2004-07-28 |
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