Axially focused radial magnet voice coil actuator

Details Axially focused radial magnet voice coil actuator Axially focused radial magnet voice coil actuator

1994-08-03

1996-07-23

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Linear

310 12, H02K 4100

Patent

active

055392628

ABSTRACT:
A novel voice coil actuator is disclosed having a magnetic flux conductive material core, an axially focused, radially oriented magnet structure, and an electrical current conductive coil. The core has a first surface and a continuous channel disposed in the first surface. The channel has a first wall and a second opposing wall, the first wall defining a recess. The magnet structure is disposed in the recess of the first wall and spaced from the second wall so that a gap remains between the magnet structure and the second wall. The magnet structure includes a first radially polarized magnet having an axially extending surface defining an upper edge and a lower edge, a second axially polarized magnet having a second magnet radially extending surface extending radially inward from the first magnet upper edge, and a third axially polarized magnet having a third magnet radially extending surface extending radially inward from the first magnet lower edge. The electrical current conductive coil is moveably suspended in the gap such that an electrical current in the coil develops a magnetic force on the coil in a direction substantially normal to the magnetic flux to displace the coil in response to the magnetic force.

REFERENCES:
patent: 5402021 (1995-05-01), Johnson
patent: 5434458 (1995-07-01), Stuart et al.

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