Low leakage actuator for high performance

Details Low leakage actuator for high performance Low leakage actuator for high performance

1995-05-17

1997-12-16

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Linear

360106, H02K 4102, G11B 3300

Patent

active

056989113

ABSTRACT:
An actuator, suited for rapidly and precisely locating the head of a disc drive, reduces variations in flux density and reluctance torque across the entire effective stroke width of the actuator. The actuator, cooperating with a voice coil motor, includes a central yoke, upper and lower yokes aligned above and below the central yoke, and side yokes all formed of magnetic permeable material, a coil movable over the central yoke, and magnets supported from the upper and lower yokes and aligned with the stroke width of the coil. The upper and lower yoke pieces are profiled to have an increased radius in the region near the ends of these yokes and near the end of the coil stroke arc. This maximizes the flux density passing through these yokes so that the flux density and torque applied to the actuator is made linear. The simple structure improves performance without any substantial increase in the design envelope and operates at high efficiency. Alternative configurations provide for portions of the central pole piece beyond the end of the stroke of the coil to become gradually wider or thicker so that the flux flow around the corners where the central pole piece meets the side pieces of the yoke does not saturate and reduce torque at the actuator, and a variation where the magnets are shaped in the vertical axis perpendicular to the plane of motion of the coil in order to promote the flux passage or distribution through the yoke.

REFERENCES:
patent: 5313124 (1994-05-01), Macpherson
patent: 5396338 (1995-03-01), Brown

Affiliated with

Also associated with

Rating

Low leakage actuator for high performance does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low leakage actuator for high performance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low leakage actuator for high performance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-209825