GB2266009B - Improvements in or relating to electric motors - Google Patents

Improvements in or relating to electric motors

Info

Publication number
GB2266009B
GB2266009B GB9207735A GB9207735A GB2266009B GB 2266009 B GB2266009 B GB 2266009B GB 9207735 A GB9207735 A GB 9207735A GB 9207735 A GB9207735 A GB 9207735A GB 2266009 B GB2266009 B GB 2266009B
Authority
GB
United Kingdom
Prior art keywords
rotor
stator
drive unit
arrow
axial movement
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.)
Expired - Fee Related
Application number
GB9207735A
Other versions
GB9207735D0 (en
GB2266009A (en
Inventor
Ronald William Woolley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FLUID FILM DEVICES Ltd
Original Assignee
FLUID FILM DEVICES Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FLUID FILM DEVICES Ltd filed Critical FLUID FILM DEVICES Ltd
Priority to GB9207735A priority Critical patent/GB2266009B/en
Publication of GB9207735D0 publication Critical patent/GB9207735D0/en
Publication of GB2266009A publication Critical patent/GB2266009A/en
Application granted granted Critical
Publication of GB2266009B publication Critical patent/GB2266009B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F16C17/026—Sliding-contact bearings for exclusively rotary movement for radial load only with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/045—Sliding-contact bearings for exclusively rotary movement for axial load only with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/107—Grooves for generating pressure
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/163—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at only one end of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2370/00—Apparatus relating to physics, e.g. instruments
    • F16C2370/12—Hard disk drives or the like

Abstract

A data storage disc drive unit 1 comprises a brushless d.c. electric motor 2 having a central stator structure 3 surrounded, in a concentric manner, by a co-operating rotor structure 4. The stator 3 and surrounding rotor 4 together define a small annular gap 5, which is used to establish a plain, sell-acting, air bearing film between the stator 2 and rotor 4. The drive unit 1 is also provided with rotor thrust bearing means 6 operable to restrain axial movement of the rotor 4 relative to the stator 2 and along the rotational axis 7 of the rotor. The magnets 29 and 18 are aligned with each other and are of opposite polarity, whereby they mutually attract to each other. This attraction urges the rotor 4 in the direction of arrow 30, pre-loading the ball bearing 20 and restraining axial movement of the stator 4 in a direction opposite to that indicated by arrow 30, so as to hold the rotor 4 in place, regardless of the attitude of the drive unit 1. <IMAGE>
GB9207735A 1992-04-08 1992-04-08 Improvements in or relating to electric motors Expired - Fee Related GB2266009B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9207735A GB2266009B (en) 1992-04-08 1992-04-08 Improvements in or relating to electric motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9207735A GB2266009B (en) 1992-04-08 1992-04-08 Improvements in or relating to electric motors

Publications (3)

Publication Number Publication Date
GB9207735D0 GB9207735D0 (en) 1992-05-27
GB2266009A GB2266009A (en) 1993-10-13
GB2266009B true GB2266009B (en) 1996-08-07

Family

ID=10713698

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9207735A Expired - Fee Related GB2266009B (en) 1992-04-08 1992-04-08 Improvements in or relating to electric motors

Country Status (1)

Country Link
GB (1) GB2266009B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2979375B2 (en) * 1994-12-27 1999-11-15 ミネベア株式会社 Flat brushless motor
IT1279208B1 (en) * 1995-05-16 1997-12-04 Bitron Spa COUPLING SYSTEM WITH MINIMUM AND CONTROLLED AXIAL CLEARANCE BETWEEN A SHAFT AND A SUPPORT IN RELATIVE ROTATION, AND RELATED PROCEDURES
KR100247356B1 (en) * 1996-11-09 2000-03-15 윤종용 Motor
EP1622252B1 (en) 1998-05-28 2012-04-18 Ibiden Co., Ltd. Motor-driving circuit
DE10361229B4 (en) * 2003-12-24 2012-01-26 Minebea Co., Ltd. Spindle motor with storage system
DE102007036692A1 (en) 2006-09-22 2008-03-27 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1438848A (en) * 1972-11-22 1976-06-09 Siemens Ag Electric motor
US4487514A (en) * 1981-09-29 1984-12-11 Tokyo Shibaura Denki Kabushiki Kaisha Motor
WO1988004787A1 (en) * 1986-12-16 1988-06-30 Eastman Kodak Company Rotary device
EP0410293A1 (en) * 1989-07-24 1991-01-30 Ebara Corporation Spindle motor
US5013947A (en) * 1990-03-16 1991-05-07 Russell Ide Low-profile disk drive motor
US5019738A (en) * 1990-07-16 1991-05-28 Lincoln Laser Company Self-pressurizing gas supported surface-roughness bearing
EP0558092A2 (en) * 1992-02-28 1993-09-01 Ebara Corporation Spindle motor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1438848A (en) * 1972-11-22 1976-06-09 Siemens Ag Electric motor
US4487514A (en) * 1981-09-29 1984-12-11 Tokyo Shibaura Denki Kabushiki Kaisha Motor
WO1988004787A1 (en) * 1986-12-16 1988-06-30 Eastman Kodak Company Rotary device
EP0410293A1 (en) * 1989-07-24 1991-01-30 Ebara Corporation Spindle motor
US5013947A (en) * 1990-03-16 1991-05-07 Russell Ide Low-profile disk drive motor
US5019738A (en) * 1990-07-16 1991-05-28 Lincoln Laser Company Self-pressurizing gas supported surface-roughness bearing
EP0558092A2 (en) * 1992-02-28 1993-09-01 Ebara Corporation Spindle motor

Also Published As

Publication number Publication date
GB9207735D0 (en) 1992-05-27
GB2266009A (en) 1993-10-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000408