Linear actuator with multiple closed loop flux paths essentially

Details Linear actuator with multiple closed loop flux paths essentially Linear actuator with multiple closed loop flux paths essentially

1987-03-26

1989-03-07

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Linear

310 14, 310266, H02K 4100

Patent

active

048109142

ABSTRACT:
Alternately stacked radial-pole stator and spacer laminations provide a simple linear actuator, in which alternating layers form magnetic teeth in the axial direction. The spacer laminations are non-ferromagnetic or dimensionally spaced from the flux path. The stator laminations have radially extending pairs of poles, forming a central hole which may be filled and ground smooth along with the spacers, forming smooth pole faces upon which the armature may slide.
Flux paths are coplanar with stator laminations, thus making each lamination completely independent. Electromagnetic force increases linearly as stator laminations are added. The stacked stator laminations have pole faces each having a finite pole face flux capacity; related armature rings can be mounted on a nonmagnetic support tube and made as light as possible so long as each ring is of sufficient cross-sectional area to carry half the pole face flux capacity. Tubular armatures provide maximum rigidity as a function of mass and permit the use of a stationary rod armature support for the tube armature. The support rod may be ferromagnetic to carry some of the flux, thereby further reducing the cross-section and the mass required for each ring.

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