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1.发明申请公开(公告)号：US20210012797A1
公开(公告)日：2021-01-14
申请号：US17037308
申请日：2020-09-29
Applicant: Western Digital Technologies, Inc.
Inventor： Diep Nguyen , David K. Myers , Bikash Sukla
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator subsystem that includes a ball screw cam assembly with a hybrid permanent magnet (PM)-variable reluctance (VR) stepper motor disposed therein, to rotate the cam screw, which vertically translates an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack. A suitably configured hybrid stepper motor can provide 200 full steps/rev for a 3.8 mm translation. Thus, to meet or surpass a step resolution of 6 μm/μstep or 0.5625°/μstep, the hybrid stepper motor would only need to be operated at 4 micro-step mode in order to achieve a 0.45°/μstep or 0.00475 mm/μstep, which enables a smoother motion since the available holding torque at the 4th micro-step provides sufficient torque margin to overcome load torque, frictional torque, and detent torque.
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2.发明授权公开(公告)号：US10811044B2
公开(公告)日：2020-10-20
申请号：US16513585
申请日：2019-07-16
Applicant: Western Digital Technologies, Inc.
Inventor： David Myers , Diep Nguyen , Bikash Sukla
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator subsystem that includes a ball screw cam assembly wherein the number of starts of a multi-start screw equals the number of balls riding in a corresponding start. A stepper motor may be disposed within the screw, to drive rotation of the screw, which drives translation of an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack. The actuator subsystem may further include a cam locking mechanism for coupling and decoupling the actuator arm with a coil support structure and corresponding voice coil, so that the cam mechanism is able to move under the control of a voice coil motor when input/output operations are performed and is able to move the actuator arm assembly during translation operations.
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3.发明授权公开(公告)号：US10930307B2
公开(公告)日：2021-02-23
申请号：US16731740
申请日：2019-12-31
Applicant: Western Digital Technologies, Inc.
Inventor： Bikash Sukla , David K. Myers , Jon M. Garbarino , Garold W. Plonczak
IPC: G11B5/48
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator assembly for moving an actuator assembly along at least one support feature to provide a head slider access to at least two different disk media of a disk stack. The HDD includes a piezoelectric-based locking mechanism, including at least one piezoelectric actuator, movably coupled with the support feature, such that actuation of the actuator either locks or unlocks the locking mechanism relative to the support feature. When unlocked, the actuator assembly can be translated along the length of the disk stack via the actuator elevator assembly.
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Patent Agency Ranking
4.发明授权公开(公告)号：US11037590B2
公开(公告)日：2021-06-15
申请号：US17037308
申请日：2020-09-29
Applicant: Western Digital Technologies, Inc.
Inventor： Diep Nguyen , David K. Myers , Bikash Sukla
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator subsystem that includes a ball screw cam assembly with a hybrid permanent magnet (PM)-variable reluctance (VR) stepper motor disposed therein, to rotate the cam screw, which vertically translates an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack. A suitably configured hybrid stepper motor can provide 200 full steps/rev for a 3.8 mm translation. Thus, to meet or surpass a step resolution of 6 μm/μstep or 0.5625°/μstep, the hybrid stepper motor would only need to be operated at 4 micro-step mode in order to achieve a 0.45°/μstep or 0.00475 mm/μstep, which enables a smoother motion since the available holding torque at the 4th micro-step provides sufficient torque margin to overcome load torque, frictional torque, and detent torque.
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5.发明申请公开(公告)号：US20200227077A1
公开(公告)日：2020-07-16
申请号：US16731740
申请日：2019-12-31
Applicant: Western Digital Technologies, Inc.
Inventor： Bikash Sukla , David K. Myers , Jon M. Garbarino , Garold W. Plonczak
IPC: G11B5/48
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator assembly for moving an actuator assembly along at least one support feature to provide a head slider access to at least two different disk media of a disk stack. The HDD includes a piezoelectric-based locking mechanism, including at least one piezoelectric actuator, movably coupled with the support feature, such that actuation of the actuator either locks or unlocks the locking mechanism relative to the support feature. When unlocked, the actuator assembly can be translated along the length of the disk stack via the actuator elevator assembly.
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公开(公告)号：US11410694B2
公开(公告)日：2022-08-09
申请号：US17064415
申请日：2020-10-06
Applicant: Western Digital Technologies, Inc.
Inventor： Diep Nguyen , David K. Myers , Bikash Sukla
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator subsystem that includes a ball screw cam assembly with an axial flux permanent magnet (AFPM) motor affixed to a cam screw to drive rotation of the screw, which drives translation of an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack.
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公开(公告)号：US20210020194A1
公开(公告)日：2021-01-21
申请号：US17064415
申请日：2020-10-06
Applicant: Western Digital Technologies, Inc.
Inventor： Diep Nguyen , David K. Myers , Bikash Sukla
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator elevator subsystem that includes a ball screw cam assembly with an axial flux permanent magnet (AFPM) motor affixed to a cam screw to drive rotation of the screw, which drives translation of an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack.
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8.发明申请公开(公告)号：US20200027480A1
公开(公告)日：2020-01-23
申请号：US16513585
申请日：2019-07-16
Applicant: Western Digital Technologies, Inc.
Inventor： David Myers , Diep Nguyen , Bikash Sukla
Abstract: An approach to a reduced-head hard disk drive (HDD) involves an actuator subsystem that includes a ball screw cam assembly wherein the number of starts of a multi-start screw equals the number of balls riding in a corresponding start. A stepper motor may be disposed within the screw, to drive rotation of the screw, which drives translation of an actuator arm assembly so that a corresponding pair of read-write heads can access different magnetic-recording disks of a multiple-disk stack. The actuator subsystem may further include a cam locking mechanism for coupling and decoupling the actuator arm with a coil support structure and corresponding voice coil, so that the cam mechanism is able to move under the control of a voice coil motor when input/output operations are performed and is able to move the actuator arm assembly during translation operations.
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