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US 2019/0097516 A1Published application
Dual pole dual bucking magnet linear actuator
AssigneeOracle International Corporation
InventorsDarryl Yeakley, Frank Goodknight, Steven Suttle
Life of this patent
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Abstract
A linear actuator includes dual bucking magnets, dual pole pieces, and dual spacers. The linear actuator includes a coil-and-housing assembly disposed around a magnet assembly. The magnet assembly includes two bucking magnets sandwiched around a central magnet. The central magnet and the bucking magnets may be separated by spacers. A housing is disposed around the magnet assembly. Between the housing and the magnet assembly, a dual coil is wound in two opposing directions to generate additive forces on the magnet assembly.
Claims20
A recording head actuator assembly comprising:
- a recording head for reading data from and/or writing data to a tape;
- a head carriage supportably holding the recording head;
- a linear actuator that vertically moves the recording head via the head carriage to follow a data track on the tape, the linear actuator comprising:
- a magnet assembly, the magnet assembly comprising:
- a central magnet comprising a north pole and a south pole;
- a pair of bucking magnets disposed on opposite ends of the central magnet, the pair of bucking magnets comprising a first bucking magnet and a second bucking magnet;
- wherein the first bucking magnet is disposed adjacent to the central magnet such that a north pole of the first bucking magnet faces the north pole of the central magnet;
- wherein the second bucking magnet is disposed adjacent to the central magnet such that a south pole of the second bucking magnet faces the south pole of the central magnet;
- a coil-and-housing assembly, the coil-and-housing assembly comprising:
- first coil portion disposed around a first portion of the central magnet and at least a portion of the first bucking magnet;
- a second coil portion disposed around a second portion of the central magnet and at least a portion of the second bucking magnet;
- a housing disposed around both the first coil portion and the second coil portion, the housing comprising (a) an inner wall facing the first coil portion and the second coil portion and (b) an outer wall;
- wherein a current flowing in the first coil portion is in an opposite direction of a current flowing in the second coil portion.
10 more elements
A method for operating a recording head actuator assembly, wherein the recording head actuator assembly comprises a linear actuator that comprises:
- a magnet assembly, the magnet assembly comprising:
- a central magnet comprising a north pole and a south pole;
- a pair of bucking magnets disposed on opposite ends of the central magnet, the pair of bucking magnets comprising a first bucking magnet and a second bucking magnet;
- wherein the first bucking magnet is disposed adjacent to the central magnet such that a north pole of the first bucking magnet faces the north pole of the central magnet;
- wherein the second bucking magnet is disposed adjacent to the central magnet such that a south pole of the second bucking magnet faces the south pole of the central magnet;
- a coil-and-housing assembly, the coil-and-housing assembly comprising:
- a first coil portion disposed around a first portion of the central magnet and at least a portion of the first bucking magnet;
- a second coil portion disposed around a second portion of the central magnet and at least a portion of the second bucking magnet;
- a housing disposed around both the first coil portion and the second coil portion, the housing comprising (a) an inner wall facing the first coil portion and the second coil portion and (b) an outer wall;
- the method comprising:
- transmitting current through the first coil portion and the second coil portion such that:
- (a) the current flowing in the first coil portion is in an opposite direction of the current flowing in the second coil portion;
- (b) causing magnetic flux to flow, through the coil-and-housing assembly, from (a) in-between the north pole of the first bucking magnet and the north pole of the central magnet to (b) in-between the south pole of the second bucking magnet and the south pole of the central magnet;
- and
- (c) causing the magnet assembly to actuate;
- and
- vertically moving a recording head for reading data from and/or writing data to a tape, the vertical moving being to follow a data track on the tape via a head carriage that supportably holds the recording head, the moving being by the linear actuator.
14 more elements
Dependencies are inferred from the claim text.