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Hollow Arm, Low Inertia Actuator With Damper And Self Sustained Air Bearing

IP.com Disclosure Number: IPCOM000048675D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Nayak, JH: AUTHOR

Abstract

This actuator is designed to move the read/write transducer on magnetic recording disks. The motion is obtained by the force generated in a moving coil 10 wound on a hollow cylindrical aluminum arm 11 which moves in an air gap between the housing and a cylindrical permanent magnet 12, and which has an orifice lla at one end thereof. The design is thus basically the conventional moving-coil type. However, the following features are new. 1. Arm 11 is hollow. This provides the most efficient mass distribution and permits high rigidity with low inertia. The lowering of the moving mass permits a compact design of the actuator. 2. Arm 11 slides on the magnet 12, requiring no additional guidance. 3.

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Hollow Arm, Low Inertia Actuator With Damper And Self Sustained Air Bearing

This actuator is designed to move the read/write transducer on magnetic recording disks. The motion is obtained by the force generated in a moving coil 10 wound on a hollow cylindrical aluminum arm 11 which moves in an air gap between the housing and a cylindrical permanent magnet 12, and which has an orifice lla at one end thereof. The design is thus basically the conventional moving-coil type. However, the following features are new.
1. Arm 11 is hollow. This provides the most efficient mass

distribution and permits high rigidity with low inertia.

The lowering of the moving mass permits a compact design

of the actuator.
2. Arm 11 slides on the magnet 12, requiring no additional

guidance.
3. The self-contained air-chamber with orifice lla is designed

to provide the optimum damping necessary to minimize the

settling time at the end of a seek operation.
4. The air escaping or entering the chamber passes via the

clearance the arm dimension and geometry are controlled to

obtain a self sustaining air-bearing between the two.
5. Moving coil 10 is made from aluminum wire to maximize the

acceleration.

An alternative design of the hollow arm can consist of aluminum/ polymer conductors molded into a cylindrical shell of polymer, such as TEFLON*.

An alternative to the self-sustained air-bearing could consist of a rolling element bearing for linear motion incorporated in front of the permanent magne...