Patent ID: 6979920

Claim:
A mover for use with a circulation system that provides a source of pressurized fluid, the mover comprising: a magnet array; a conductor array that interacts with the magnet array when electrically excited; and a circulation housing that is secured to one of the arrays and cooperates with at least one of the arrays to define a fluid passageway near the conductor array, the circulation housing including a first wall having a wall thickness, wherein the wall thickness at a first position of the first wall is different than the wall thickness at a second position of the first wall, wherein the size of the fluid passageway at the first position is different than the size of the fluid passageway at the second position while no fluid is being directed through the fluid passageway, and wherein the size of the fluid passageway at the first position is approximately egual to the size of the passageway at the second position while fluid is being directed through the fluid passageway.