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 0 0 0

Contents 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 1

１ ． HDD Spindle Motor Business - Current Prospect 2003 10,000Kpcs / Month 500K 1,500K 1,600K 1,400K 300K 1,000K 1,200K 1,000K 2001 CQ3 5,000Kpcs / Month 2000 CQ3 3,500Kpcs / Month 3.5-inch Lowend, Desktop PC/STB 65K 3.5-inch Highend, 450K 3K Desktop PC 1,958K 550K 2.5-inch Mobile 1999 CQ1 1,147K 2,022Kpcs / Month 3.5-inch Highend, 2000 April Enterprise/Host 2,150Kpcs / Month 2

１ ． HDD Spindle Motor Business - Current Prospect HDD Spindle Motor Forcast 400,000K Shipping Quantity [pcs] 330,000K 350,000K Others 272,000K 300,000K Minebea 240,000K 250,000K 189,000K 200,000K 140,400K 36% 150,000K 114,600K 117,600K 30% 25% 100,000K 21% 20% 14% 50,000K 13% 0K 1997 1998 1999 2000 2001 2002 2003 Annual production quantity K=1,000pcs Excluding Minebea, Other Manufacturers total, referenced from Pi xie Pinnacle Corporation 3

２ ． RO Bearing Motor – Performance and Advantage Stracture of RO Bearing Preload Floating inner ring Balls + Cage Motor hub Outer ring with two raceways Shaft with integrated raceway 4

２ ． RO Bearing Motor – Performance and Advantage Graph A Thermal ( 20°C ～ 60°C ) Resonance Shift 12.0 RO Bearing Motor Discrete Bearing Motor 10.0 10.0Hz discrete RO Resonance Shift [Hz] 8.0 6.0 6.1Hz 4.0 2.0 0.0 RO Bearing Motor Discrete Bearing Motor Graph C Graph B Thermal ( 20°C ～ 60°C ) Radial Runout Shift Resonance Range ( Max. ～ Min. ) at Different Rotational Speeds 0.30 20.0 Mean 3ó 18.0 @4,500rpm @5,400rpm 16.0 @7,200rpm Resonance Range @20°C [Hz] Radial Runout [ì m] 0.20 14.0 12.0 10.0 8.0 0.10 6.0 4.0 2.0 0.00 0.0 RO Bearing Discrete Bearing Discrete Bearing Discrete Bearing RO Bearing Discrete Bearing Discrete Bearing Discrete Bearing Motor Motor Motor, 10ì m- Motor, 20ì m- Motor Motor Motor, 10ì m- Motor, 20ì m- Misaligned Misaligned Misaligned Misaligned 5

２ ． RO Bearing Motor – Performance and Advantage Resonance Range ( @25 ° C ) 2.5 inch Spindle Motor Performance 25.0 Resonance Range [Hz] 20.0 15.0 23.2Hz 10.0 11.8Hz 5.0 0.0 RO-Bearing Motor Discrete Bearing Motor NRRO, Axial, With Disk, OverAll 0.6 NRRO, Axial [ì m] 0.5 0.4 0.3 0.40 μ m 0.55 μ m 0.2 0.1 ～ RO Bearing stiffness results in 0.0 smaller NRRO and narrower RO-Bearing Motor Discrete Bearing Motor Resonance range. ～ 6

２ ． RO Bearing Motor – Performance and Advantage Technical Problem of Ball Bearings with Ceramic Balls Loosing of Preload Ball Bearing with Steel Balls: Same Ball and Ring Materials => Same Thermal Expansion No Preload Loosing Problem in Temperature Variation Ball Bearing with Ceramic Balls: Different Ball and Ring Material => Different Thermal Expansion Preload Loosing Problem in Temperature Variation 7

２ ． RO Bearing Motor – Performance and Advantage Prevention of the Loosing Preload in RO Bearing with Ceramic Balls Room Temperature High Temperature 8

２ ． RO Bearing Motor – Performance and Advantage Principle of Compensating the Preload 9

２ ． RO Bearing Motor – Performance and Advantage Difficulty of Retaining the Preload in Discrete Ball Bearings with Ceramic Balls NO Compression of Spacer Compression of Outer Ring 10

２ ． RO Bearing Motor – Performance and Advantage Projection of RO Bearing Motor Production RO- Bearing Discrete Bearing 61% 2000 CQ3 3,500Kpcs / Month RO- Discrete Bearing Bearing 45% 2000 April 2,150Kpcs / Month 11

３ ． Fluid Dynamic Bearing – Minebea Strategy Reality Sales talk ・ Contradiction High Cost ・ Low Cost ・ Questionable ・ Good Performance reliability NRRO/Noise/ Burr/Contamination Oil Leakage Speed Cost is a Key to the Success in FDB Business. 12

３ ． Fluid Dynamic Bearing – Minebea Strategy FDB developed by Seagate ： Capital expenditure 2 Ball Bearings + 1 Shaft > 1 FDB (Greater than) Reliability: Excellent Design and know-how (Burr Free, less Contamination and No Oil Leakage) 13

３ ． Fluid Dynamic Bearing – Minebea Strategy Capital expenditure for Additional HDD Spindle Motor Production Capacity Additional Capacity Existing capacity ＋ 6Mil. Units/Month 4Mil. Units/Month at ¥7.5 Billion 10Mil. Units/Month FDB Mass production starts within year 2000 14

３ ． Fluid Dynamic Bearing – Minebea Strategy Spindle Motor Performance Comparison by Bearing Types Non Minebea’s Discrete RO FDB △ ○ ◎ NRRO △ ○ ◎ Life, High Speed Rotation ○ ○ ◎ Acoustic Noise ◎ ◎ △ Load Carrying Capacity ○ ○ ？ Torque ○ ○ ？ Shock Torrelance ○ ◎ ？ Thermal Characteristics ◎ ◎ ？ Cost Advantage Both Both Specific Rotating Direction ○ ◎ ？ Ease of Assembly （ ） RO : Ceramic Ball Type Note 15

３ ． Fluid Dynamic Bearing – Minebea Strategy Spindle Motor Performance Comparison by Bearing Types Minebea’s FDB Discrete RO △ ○ ◎ NRRO △ ○ ◎ Life, High Speed Rotation ○ ○ ◎ Acoustic Noise ◎ ◎ △ Load Carrying Capacity ○ ○ ○ Torque ○ ○ ○ Shock Torrelance ○ ◎ ○ Thermal Characteristics ◎ ◎ ◎ Cost Advantage Both Both Specific Rotating Direction ○ ◎ ○ Ease of Assembly （ ） RO : Ceramic Ball Type Note 16

4. Fluid Dynamic Bearing – Minebea Strategy Ball Bearing Sales Results & Forecast 140,000K Forecast Results P/O received November 1999 130,000K 126,417Kpcs Quantity / Month [ pcs ] 120,000K February 2000 121,264 110,000K 100,000K 90,000K Mar-98 Jun-98 Sep-98 Dec-98 Mar-99 Jun-99 Sep-99 Dec-99 Mar-00 Jun-00 Sep-00 17

５ . RO Bearing – Future Application 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 RRO, Radial, OverAll 0.25 6.0 NRRO, Radial [ì m] RRO, Radial [ì m] 5.0 0.20 4.0 0.15 3.0 4.52 μ m, 0.21 μ m, 0.10 2.0 Average 0.09 μ m, Average 0.07 μ m, 0.05 1.0 Average Average 0.00 0.0 RO-Bearing Discrete RO-Bearing Discrete Bearing Bearing Rotating accuracy comparison between RO bearing and Discrete Bearing for Pivot Assy. 18

５ . RO Bearing – Future Application Pivot Assy Sales Results & Forecast 12,000K Results Forecast P/O received October 1999 Quantity / Month [ pcs ] 10,000K 9,480Kpcs 8,000K February 2000 8,335Kpcs 6,000K 4,000K Mar-98 Jun-98 Sep-98 Dec-98 Mar-99 Jun-99 Sep-99 Dec-99 Mar-00 Jun-00 Sep-00 19

５ . RO Bearing – Future Application RO Bearing Fan Motor - Ultra High Performance & High Reliability - Impeller Casing RO Bearing Casing Yoke 20

６ ． Minebea Production Support and It’s Organization ： ９ ２ Motor Engineer Thailand R&D Engineer ： ５ ３ 15 •Mass Production Japan R & D Germany •Planning •Product Design •Clean Technology •Product Design 57 53 20 •Product Development •Material Science •Product Development •Tool/Equipment Development •Tribology •Tool/Equipment •Electrical/Software •Reliability Development Development. •Electrical/Software •Production Engineering Development •Quality Engineering •Production Engineering •Pilot Production •Quality Engineering 21

６ ． Minebea Production Support and It’s Organization R&D Mass-Production Japan Support Thailand Germany Sample Production Thailand Thailand Germany Japan Singapore Design & Development Germany Japan Planning Japan 22

７ ． Summary １ ． Minebea HDD Spindle Motor expects Strong Demand and Steep Growth. 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. 23