Data Storage Institute

Marvell International Limited

Qide Zhang

Shixin Chen

Teck Seng Low

Zhejie Liu

Yuen Ann Mah

Zhimin Yuan

Bo Liu

Li Wang

Chun Lian Ong

Siang Huei Leong

Weiya Xi

Khai Leong Yong

Jianzhong Shi

Kui Cai

Pantelis Sophoclis Alexopoulos

Chao Bi

Quan Jiang

Kheong Sann Chan

Zhi Yong Ching

Budi Santoso

Jing Zhang

Moulay Rachid Elidrissi

Chiew Leong Wong

Zhimin He

Guchang Han

Mengjun Liu

Tiejun Zhou

Jiang Feng Hu

Leonard Gonzaga

Ke Gan

Wuzhong Lin

Wee Kiat Lim

Mohammed Abdul Jabbar

Sufui Sophia Tan

Yansheng Ma

Kannan Sundaravadivelu

Ningyu Liu

Jianqiang Mou

Boon Long Ibrahim See

Venkataramanan Venkatakrishnan

Cheng Peng Tan

Chong Wee Lee

Ma Jabbar

Phyu Hla Nu

Wei Hua

Cheng Su Soh

Shengkai Yu

Yin Quan Yu

According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Data storage device

A high precision spindle suitable for hard disk drives, optical disk drives, such as DVDs, CD drives, and other applications includes a hub, a hybrid hydrodynamic an aerodynamic bearing system, a brushless motor, a starting/stopping assistant device and a base. The hybrid fluid film bearing system ensures that the spindle works at high precision, low acoustic noise and low power consumption. The starting/stopping assistant device lifts the rotating portion of the spindle and its load by means of magnetic force, hence, reduces the friction between the contacted surfaces of thrust air bearing. It reduces the starting/stopping time and lessens the wear of bearing, therefore, effectively suppresses the contamination caused by wear particles. Magnetic seals are also provide to prevent journal bearing fluid from leaking.

Electric spindle motor and method having magnetic starting/stopping device

A spindle motor ( ) including a stator component ( ), a rotor component ( ), including a hub ( ) for supporting one or more discs, and a bearing assembly between tHe components, formed of a journal bearing ( ) and a thrust bearing ( ), wherein the journal bearing ( ) is an aerodynamic bearing and the thrust bearing is adapted to function in a bi-directional manner and includes an annular member ( ) projecting radially from one of the components into an associated recess ( ) formed in the other of the components. Preferably, the annular member has two opposed bearing faces ( ) arranged adjacent corresponding bearing surfaces of the recess, and a hydrodynamic bearing is formed between the respective bearing faces and surfaces.

Spindle motor with an aerodynamic and hydrodynamic bearing assembly

An electric spindle motor for use in precision instruments such as hard disk drives comprises a stationary sub-assembly and a rotary sub-assembly movable relative to the stationary sub-assembly for carrying magnetic disks. The electric spindle motor has an integrated bearing system including a hydrodynamic journal bearing for providing desired radial load and a magnetic bearing for reducing friction resistance during staring/stopping and running of the electric spindle motor. The rotary sub-assembly is suspended from the stationary sub-assembly by the activation of the magnetic bearing during the rotating of the electric spindle motor. The electric spindle motor having integrated hydrodynamic journal bearing and magnetic bearing of the present invention is capable of high speed and high accuracy running, providing increased radial load and stiffness, and reduces the friction resistance therefore improves the performance and power saving.

Electric spindle motor with magnetic bearing and hydrodynamic bearing

An electric spindle motor has a base assembly (19) and a hollow notatable hub (16) housing a motor. The hub (16) is mounted for rotation about an axis and a stator (12) is mounted on the base assembly (19) inside the hub (16). A liquid filled journal bearing (11, 21) acts between the base assembly (19) and the hub (16) to provide radial support of the hub (16). A gas filled thrust bearing (26, 27, 35) also acts between the hub (16) and base assembly (19) to provide at least axial support of the hub (16).

Electric spindle motor

An electric spindle motor has a base assembly (19) and a hollow notatable hub (16) housing a motor. The hub (16) is mounted for rotation about an axis and a stator (12) is mounted on the base assembly (19) inside the hub (16). A liquid filled journal bearing (11,21) acts between the base assembly (19) and the hub (16) to provide radial support of the hub (16). A gas filled thrust bearing (26, 27, 35) also acts between the hub (16) and base assembly (19) to provide at least axial support of the hub (16).

Growing community of inventors

Singapore, Singapore

Qide Zhang