MINEBEA Technical Conference HDD Spindle Motor & Bearing M a - - PowerPoint PPT Presentation

MINEBEA

Technical Conference

～HDD Spindle Motor & Bearing～

M a r c h 2 4 , 2

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１ ． HDD Spindle Motor Business - Current Prospect ２ ． RO Bearing Motor - Performance and Advantage ３ ． Fluid Dynamic Bearing - Minebea Strategy ４ ． Fluid Dynamic Bearing - Impact to Ball Bearing Business ５ ． RO Bearing - Future Application ６ ． Minebea Production Support and It’s Organization ７ ． Summary Contents

2 2001 CQ3 5,000Kpcs / Month

1,500K 500K 1,600K 1,400K

1999 CQ1 2,022Kpcs / Month

65K 1,958K

2003 10,000Kpcs / Month

2000 April 2,150Kpcs / Month

550K 3K 1,147K 450K 2000 CQ3 3,500Kpcs / Month 1,000K 300K 1,200K 1,000K

１ ．HDD Spindle Motor Business - Current Prospect

3.5-inch Lowend, Desktop PC/STB 3.5-inch Highend, Desktop PC 2.5-inch Mobile 3.5-inch Highend, Enterprise/Host

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Annual production quantity K=1,000pcs Excluding Minebea, Other Manufacturers total, referenced from Pi xie Pinnacle Corporation

114,600K

20%

117,600K

13%

140,400K

14%

189,000K

21%

240,000K

25%

272,000K

30%

330,000K

36%

0K 50,000K 100,000K 150,000K 200,000K 250,000K 300,000K 350,000K 400,000K

Shipping Quantity [pcs]

1997 1998 1999 2000 2001 2002 2003

HDD Spindle Motor Forcast

Others Minebea

１ ． HDD Spindle Motor Business - Current Prospect

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Floating inner ring Motor hub Outer ring with two raceways Balls + Cage

Preload

Shaft with integrated raceway

２ ．RO Bearing Motor – Performance and Advantage

Stracture of RO Bearing

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RO discrete

Resonance Range ( Max. ～ Min. ) at Different Rotational Speeds

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 RO Bearing Motor Discrete Bearing Motor Discrete Bearing Motor, 10ì m- Misaligned Discrete Bearing Motor, 20ì m- Misaligned

Resonance Range @20°C [Hz]

@4,500rpm @5,400rpm @7,200rpm

Thermal ( 20°C ～ 60°C ) Radial Runout Shift

0.00 0.10 0.20 0.30 RO Bearing Motor Discrete Bearing Motor Discrete Bearing Motor, 10ì m- Misaligned Discrete Bearing Motor, 20ì m- Misaligned Radial Runout [ì m] Mean 3ó

Thermal ( 20°C ～ 60°C ) Resonance Shift 10.0Hz 6.1Hz

0.0 2.0 4.0 6.0 8.0 10.0 12.0 RO Bearing Motor Discrete Bearing Motor

Resonance Shift [Hz] RO Bearing Motor Discrete Bearing Motor

２ ．RO Bearing Motor – Performance and Advantage Graph A Graph C Graph B

6 Resonance Range ( @25°C )

23.2Hz 11.8Hz

0.0 5.0 10.0 15.0 20.0 25.0 RO-Bearing Motor Discrete Bearing Motor Resonance Range [Hz]

NRRO, Axial, With Disk, OverAll 0.55μm 0.40μm 0.0 0.1 0.2 0.3 0.4 0.5 0.6

RO-Bearing Motor Discrete Bearing Motor

NRRO, Axial [ì m]

2.5 inch Spindle Motor Performance ～RO Bearing stiffness results in smaller NRRO and narrower Resonance range. ～

２ ．RO Bearing Motor – Performance and Advantage

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Loosing of Preload Ball Bearing with Steel Balls: Same Ball and Ring Materials => Same Thermal Expansion Ball Bearing with Ceramic Balls: Different Ball and Ring Material => Different Thermal Expansion

No Preload Loosing Problem in Temperature Variation Preload Loosing Problem in Temperature Variation

Technical Problem of Ball Bearings with Ceramic Balls

２ ．RO Bearing Motor – Performance and Advantage

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Room Temperature High Temperature Prevention of the Loosing Preload in RO Bearing with Ceramic Balls

２ ．RO Bearing Motor – Performance and Advantage

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Principle of Compensating the Preload

２ ．RO Bearing Motor – Performance and Advantage

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Difficulty of Retaining the Preload in Discrete Ball Bearings with Ceramic Balls

Compression of Spacer

NO

２ ．RO Bearing Motor – Performance and Advantage

Compression of Outer Ring

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2000 CQ3 3,500Kpcs / Month

Discrete Bearing

RO- Bearing 61%

2000 April 2,150Kpcs / Month

Discrete Bearing

RO- Bearing 45%

Projection of RO Bearing Motor Production

２ ．RO Bearing Motor – Performance and Advantage

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Reality ・ High Cost ・ Questionable reliability

Burr/Contamination

Oil Leakage

Contradiction

Cost is a Key to the Success in FDB Business.

３ ．Fluid Dynamic Bearing – Minebea Strategy

Sales talk ・Low Cost ・ Good Performance NRRO/Noise/ Speed

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FDB developed by Seagate

Capital expenditure ： 2 Ball Bearings + 1 Shaft > 1 FDB Reliability: Excellent Design and know-how

(Burr Free, less Contamination and No Oil Leakage)

３ ．Fluid Dynamic Bearing – Minebea Strategy

(Greater than)

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Capital expenditure for Additional HDD Spindle Motor Production Capacity

Existing capacity

• 4Mil. Units/Month

Additional Capacity

• 6Mil. Units/Month

at ¥7.5 Billion

• 10Mil. Units/Month

FDB Mass production starts within year 2000

３ ． Fluid Dynamic Bearing – Minebea Strategy

＋

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Spindle Motor Performance Comparison by Bearing Types

（ Note ）RO : Ceramic Ball Type

３ ． Fluid Dynamic Bearing – Minebea Strategy

NRRO Life, High Speed Rotation

Acoustic Noise Load Carrying Capacity Torque Shock Torrelance Thermal Characteristics Cost Advantage Rotating Direction Ease of Assembly

RO △ △ ○ ◎ ○ ○ ○ ◎ Both ○ ○ ○ ○ ◎ ○ ○ ◎ ◎ Both ◎ ◎ ◎ ◎ △ ？ ？ ？ ？ Specific ？ Discrete

Non Minebea’s

FDB

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Spindle Motor Performance Comparison by Bearing Types

（ Note ）RO : Ceramic Ball Type

３ ． Fluid Dynamic Bearing – Minebea Strategy

NRRO Life, High Speed Rotation

Acoustic Noise Load Carrying Capacity Torque Shock Torrelance Thermal Characteristics Cost Advantage Rotating Direction Ease of Assembly

RO △ △ ○ ◎ ○ ○ ○ ◎ Both ○ ○ ○ ○ ◎ ○ ○ ◎ ◎ Both ◎ Discrete

Minebea’s FDB

◎ ◎ ◎ △ ○ ○ ○ ◎ Specific ○

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Ball Bearing Sales Results & Forecast

November 1999 126,417Kpcs P/O received February 2000 121,264

90,000K 100,000K 110,000K 120,000K 130,000K 140,000K

Mar-98 Jun-98 Sep-98 Dec-98 Mar-99 Jun-99 Sep-99 Dec-99 Mar-00 Jun-00 Sep-00

Quantity / Month [ pcs ]

Results Forecast

• 4. Fluid Dynamic Bearing – Minebea Strategy

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RRO, Radial, OverAll

0.09μm, Average 4.52μm, Average 0.0 1.0 2.0 3.0 4.0 5.0 6.0

RO-Bearing Discrete Bearing

RRO, Radial [ì m]

Rotating accuracy comparison between RO bearing and Discrete Bearing for Pivot Assy.

Eg.１ ： Precision Pivot Assy. Though we now have a strong demand of RO Bearing for HDD Spindle Motors, we will explore new applications.

NRRO, Radial, OverAll

0.07μm, Average 0.21μm, Average 0.00 0.05 0.10 0.15 0.20 0.25

RO-Bearing Discrete Bearing

NRRO, Radial [ì m]

５. RO Bearing – Future Application

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Pivot Assy Sales Results & Forecast

February 2000 8,335Kpcs October 1999 9,480Kpcs P/O received

4,000K 6,000K 8,000K 10,000K 12,000K

Mar-98 Jun-98 Sep-98 Dec-98 Mar-99 Jun-99 Sep-99 Dec-99 Mar-00 Jun-00 Sep-00

Quantity / Month [ pcs ]

Results Forecast

５. RO Bearing – Future Application

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RO Bearing Fan Motor

• Ultra High Performance & High Reliability -

５. RO Bearing – Future Application

Impeller RO Bearing Yoke Casing Casing

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• Product Design
• Product Development
• Tool/Equipment Development
• Electrical/Software

Development.

• Production Engineering
• Quality Engineering
• Pilot Production
• Clean Technology
• Material Science
• Tribology
• Reliability
• Planning
• Product Design
• Product Development
• Tool/Equipment

Development

• Electrical/Software

Development

• Production Engineering
• Quality Engineering

Thailand

R & D Germany Japan

57 53 20 15

• Mass Production

６ ． Minebea Production Support and It’s Organization

Motor Engineer ： ９ ２ R&D Engineer ： ５ ３

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Planning Sample Production Design & Development Mass-Production

R&D

Japan Germany Thailand Singapore

Support

６ ． Minebea Production Support and It’s Organization

Thailand Germany Japan Japan Thailand Germany Japan

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１ ． Minebea HDD Spindle Motor expects Strong Demand and Steep Growth.

７ ． Summary

２ ． Minebea HDD Spindle Motor continues to use RO Bearing because of its Superior Performance. ３ ． Minebea FDB has Advantages in both Cost and Reliability. ４ ． FDB does not Affect has Minebea’s Current Ball Bearing Business. ５ ． RO Bearing will be used not only for HDD Spindle Motors but also for Other High Value Added Products. ６ ． Globalized R&D Production set up will enhance Minebea’s Further Growth.