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Linear electromagnetic actuators used for positioning magnetic heads to a selected track in a disk file generally involve high mass, are quite bulky, and must be manufactured to close tolerances.
English (United States)
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Small Modular Linear Voice Coil Actuator
Linear electromagnetic actuators used for positioning magnetic heads to a
selected track in a disk file generally involve high mass, are quite bulky, and must
be manufactured to close tolerances.
Fig. 1 is a cross-sectional view of a small linear voice coil actuator which has
a low profile and is modular to the extent that one or more of the units can be
stacked on each other. Fig. 2 is a top view of the actuator shown in Fig. 1 with
a portion of the upper flux return path broken away to show the internal structure.
Fig. 3 is a crosssectional view which shows an alternate arrangement for guiding
The actuator shown in Fig. 1 comprises a center pole 14, and upper and
lower flux return members 15 and 16, respectively. Members 14, 15 and 16 have
rectangular cross-sections, as shown in Fig. 1, and are connected together at
one end. A pair of rectangular magnets 17 and 18 are attached to the distal
ends of members 15 and 16, respectively, and define first and second flux gaps
20 and 21. Two parallel flux paths are, therefore, established from the magnets
through the center pole piece 14 to the members 15 and 16 back to the magnets
17 and 18.
A coil 22 having a rectangular cross-section corresponding to the center pole
14 is arranged to slide over center pole 14 so that the flat portions of the coil
disposed in flux gaps 20 and 21 are subjected to the flux passing from magnets
17 and 18 to members 15 and 16.
Coil 22 is attached to a carriage assembly to guide the movement of coil 22
along the axis of center pole 14 when coil 22 is suitably energized. The
carriage assembly comprise...