Browse Prior Art Database

Low Mass Actuator

IP.com Disclosure Number: IPCOM000042410D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Watrous, RB: AUTHOR

Abstract

The actuator 10, shown in the Figs. 1, 2 and 3, is the type that fits between the disks 11 and has the head suspensions 13 attached directly to the voice coil motor. There are no arms. Also, the moving mass is supported on air bearings so that there is no friction, stiction or roughness of motion. The weight is low enough so that only a low pressure is required for the bearing. Thus, a small air pump can service many actuators simultaneously. The moving shuttle 14 consists of a horizontal member 15 and two vertical blades 16 arranged in the shape of an H. The horizontal member 15 consists of coils 17 sandwiched between two flat plates 18. The air bearing surfaces HS that support the shuttle 14 are on the upper and lower sides of the horizontal member 15 and on the inside surfaces VS of the vertical blades 16.

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Low Mass Actuator

The actuator 10, shown in the Figs. 1, 2 and 3, is the type that fits between the disks 11 and has the head suspensions 13 attached directly to the voice coil motor. There are no arms. Also, the moving mass is supported on air bearings so that there is no friction, stiction or roughness of motion. The weight is low enough so that only a low pressure is required for the bearing. Thus, a small air pump can service many actuators simultaneously. The moving shuttle 14 consists of a horizontal member 15 and two vertical blades 16 arranged in the shape of an H. The horizontal member 15 consists of coils 17 sandwiched between two flat plates 18. The air bearing surfaces HS that support the shuttle 14 are on the upper and lower sides of the horizontal member 15 and on the inside surfaces VS of the vertical blades 16. These surfaces mate with the outside surfaces of the stationary frame member 19 and also with upper and lower surfaces 22 of the horizontal slot 23 in the frame assembly 19. Shallow slots 24 in the shuttle distribute the air to the bearing surfaces for all positions of the shuttle along its full stroke travel. The shuttle 14 has two coils 17 which act with the flux from the rows of magnets 26 in the frame assembly 19 to produce the driving force on the shuttle. One coil is energized until it moves to a boundary between two magnets, and then the other is energized to continue the shuttle motion. An advantage of the H-shaped shuttle 15 is tha...