Patent ID: 8047813

Claim:
A method comprising: providing a pump, a motor driving the pump, an inner housing assembly comprising an inner housing and outer housing, the inner housing having an end plate, sealing the inner housing relative to the outer housing, and containing the pump and an armature of the motor therewithin; separating a coil and core of the motor away from the armature of the motor by embedding in the material of the end plate the coil and core as part of the inner housing assembly; containing completely the inner housing within the outer housing; supporting the outer housing on a substantially planar surface defining radial directions contained therein and an axial direction perpendicular thereto; supporting the inner housing on elastomeric feet each having a thickness effective to isolate radial transmission of motion between the armature and the outer housing; operating the armature to move substantially exclusively in an arc substantially parallel to the planar surface; and damping axial motion of the inner housing assembly against transmission of axial motion between the inner housing and the outer housing.