Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Disk Storage Device with a Direct Power Output Motor Controller

IP.com Disclosure Number: IPCOM000014872D
Original Publication Date: 2001-Mar-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 54K

Publishing Venue

IBM

Abstract

Disclosed is a disk storage device, such as a hard disk drive (HDD) or CD-ROM, incorporating an application specific integrated circuit (ASIC) which drives the motors (disk spindle motor or actuator voice coil motor) without additional analog amplification. On current HDDs, the motor controller ASIC output must be amplified to drive the voice coil motor (VCM) and/or spindle motor. Typically a MOSFET circuit, external to the ASIC, is used for amplification, as shown in Fig. 1. V Motor Driver ASIC

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 81% of the total text.

Page 1 of 1

Disk Storage Device with a Direct Power Output Motor Controller

   Disclosed is a disk storage device, such as a hard disk drive (HDD) or CD-ROM, incorporating an application specific integrated circuit (ASIC) which drives the motors (disk spindle motor or actuator voice coil motor) without additional analog amplification. On current HDDs, the motor controller ASIC output must be amplified to drive the voice coil motor (VCM) and/or spindle motor. Typically a MOSFET circuit, external to the ASIC, is used for amplification, as shown in Fig. 1.

V

Motor Driver

ASIC

Power MOSFET

Figure 1. Conventional HDD motor controller circuit

We disclose here an HDD, CD-ROM, or other storage device in which the motor controller provides sufficient power to drive the motor, without utilizing external analog amplification. Figure 2 shows the motor driving circuit using the disclosed direct power motor controller.

Figure 2. Circuit using the disclosed Direct Power Output Motor Controller

     There are a number of advantages of the disclosed device. First, cost is reduced by eliminating the analog amplifier. Also, the motor driver circuit has fewer components, thus simplifying the circuit and improving reliability. Finally a direct digital motor driver provides a higher quality signal to the motors. Capacitive coupling and other interactions between the ASIC, amplifier and motor coils are no longer possible. Output linearity is improved, group delay distortion reduced, and dependence on lead...