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2010-12-01T20:36:36+01:00
2010-10-18T17:14:41+01:00
2010-12-01T20:36:36+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0501661-A3-19940427
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EP-0501661-A3-19940427
A linear actuator for e.g. a disk drive has a fixed member (19) and a movable member (101). One of those members (19,101) carries at least one track (3) of permanent magnets extending in the direction in which the movable member (3) is to move, with adjacent permanent magnets having alternate magnetic polarity. The other member (19,101) has first and second drive parts each having at least one pair of opposed sets of teeth (1,2). The or each track (3) passes between those teeth (1,2). Each pair of teeth (1,2) is associated with a corresponding drive coil (4,5) giving the teeth (1,2) a magnetic polarity so that there is a magnetic alignment between a polarity of the teeth (1,2) and the permanent magnets (3). The drive parts are arranged so that, for any given relative position of the first and second members (19,101), the magnetic alignment of the teeth (1,2) of one drive part is out of phase with the magnetic alignment of the teeth (1,2) of the other part. In order to ensure that the magnetic alignments are out of phase, there may be a physical displacement between the teeth (1,2) of the two drive parts. This displacement may be (m ± 1/2).Tp where m is an integer and Tp is the teeth pitch. This gives a phase displacement of 180°. Alternatively, the drive parts may be aligned, and two tracks (3) of permanent magnets be --> provided with the magnets thereof having opposite polarity for a given track position, or the drive current to the drive coils (4,5) may be controlled to be out of phase. Such arrangements permits smooth driving of the movable member (101).
A linear actuator for e.g. a disk drive has a fixed member (19) and a movable member (101). One of those members (19,101) carries at least one track (3) of permanent magnets extending in the direction in which the movable member (3) is to move, with adjacent permanent magnets having alternate magnetic polarity. The other member (19,101) has first and second drive parts each having at least one pair of opposed sets of teeth (1,2). The or each track (3) passes between those teeth (1,2). Each pair of teeth (1,2) is associated with a corresponding drive coil (4,5) giving the teeth (1,2) a magnetic polarity so that there is a magnetic alignment between a polarity of the teeth (1,2) and the permanent magnets (3). The drive parts are arranged so that, for any given relative position of the first and second members (19,101), the magnetic alignment of the teeth (1,2) of one drive part is out of phase with the magnetic alignment of the teeth (1,2) of the other part. In order to ensure that the magnetic alignments are out of phase, there may be a physical displacement between the teeth (1,2) of the two drive parts. This displacement may be (m ± 1/2).Tp where m is an integer and Tp is the teeth pitch. This gives a phase displacement of 180°. Alternatively, the drive parts may be aligned, and two tracks (3) of permanent magnets be --> provided with the magnets thereof having opposite polarity for a given track position, or the drive current to the drive coils (4,5) may be controlled to be out of phase. Such arrangements permits smooth driving of the movable member (101).
en
European Patent Office
EP0501661
EP 0501661
H02K 41/02
Linear actuator
Linear actuator - European Patent Office - EP 0501661 A3
Linear actuator - European Patent Office - EP 0501661 A3
Adobe PDF Library 8.0
"EP0501661"; "EP 0501661"; "H02K 41/02"; "Linear actuator"
1.4
1
B
2
EP
0501661
A3
1994-04-27
92301336
1992-02-19
JP
3607491
1991-03-01
H02K 41/02
HITACHI, LTD.
Nihei, Hideki
Kawamata, Syooichi
Horie, Hideaki
Morinaga, Shigeki
Mutoh, Nobuyoshi
Calderbank, Thomas Roger et al
Linear actuator
Linearer Antrieb
Linear actuator
Actionneur linéaire
A linear actuator for e.g. a disk drive has a fixed member (19) and a movable member (101). One of those members (19,101) carries at least one track (3) of permanent magnets extending in the direction in which the movable member (3) is to move, with adjacent permanent magnets having alternate magnetic polarity. The other member (19,101) has first and second drive parts each having at least one pair of opposed sets of teeth (1,2). The or each track (3) passes between those teeth (1,2). Each pair of teeth (1,2) is associated with a corresponding drive coil (4,5) giving the teeth (1,2) a magnetic polarity so that there is a magnetic alignment between a polarity of the teeth (1,2) and the permanent magnets (3). The drive parts are arranged so that, for any given relative position of the first and second members (19,101), the magnetic alignment of the teeth (1,2) of one drive part is out of phase with the magnetic alignment of the teeth (1,2) of the other part. In order to ensure that the magnetic alignments are out of phase, there may be a physical displacement between the teeth (1,2) of the two drive parts. This displacement may be (m ± 1/2).Tp where m is an integer and Tp is the teeth pitch. This gives a phase displacement of 180°. Alternatively, the drive parts may be aligned, and two tracks (3) of permanent magnets be --> provided with the magnets thereof having opposite polarity for a given track position, or the drive current to the drive coils (4,5) may be controlled to be out of phase. Such arrangements permits smooth driving of the movable member (101).
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