Magnetic recording disk file.

摘要

A linear motor actuator for a magnetic read/write head has its stator located between a pair of disks within a stack of magnetic recording disks. The stator comprises an array of reversed polarity magnets 42, 43 (preferably permanent) in a linear array, the two end magnets 42 min being half the width of the others. A pair of flat coils 24, 25 are the drive elements of the armature of the motor with the coils arranged in side-by-side relationship for bridging from magnet to magnet of the stator, so that the armature will not stall between magnets. The actuator is controlled by an external microprocessor electronic control system for selecting any position precisely, rather than in steps as in a stepping motor. The microprocessor effects servo control of the actuator and its direction of motion based upon feedback signals. The stator arrangement including plates 41, 42 and end magnets 42 min reduce fringing flux thereby allowing said stator location between the associated pair of disks.