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1.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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2.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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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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Patent Agency Ranking
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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5.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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公开(公告)号：US20200027479A1
公开(公告)日：2020-01-23
申请号：US16513611
申请日：2019-07-16
Applicant: Western Digital Technologies, Inc.
Inventor： David Myers , Diep Nguyen
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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7.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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公开(公告)号：US10902871B2
公开(公告)日：2021-01-26
申请号：US16513611
申请日：2019-07-16
Applicant: Western Digital Technologies, Inc.
Inventor： David Myers , Diep Nguyen
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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