Patent ID: 8704411
Filing Date: 2014-04-22
Classification: F04B,H02K

Abstract:
1. A motor, comprising: a buried magnet system comprising washer-shaped magnets that are axially-magnetized and positioned between washer-shaped iron pieces; at least one stator comprising stator teeth and a coil operable to produce an alternating magnetic field exerting alternating axial forces on the buried magnet system that has a self-centering force and a required stiffness to reciprocate at a frequency near an alternating current (AC) supply frequency; and a piston assembly placed through a hole of the buried magnet system and operatively connected to the buried magnet system, wherein the reciprocating of the buried magnet system causes reciprocation of the piston assembly within a cylinder to create oscillating pressure within the cylinder, wherein a surface length of each of the stator teeth is greater than a sum of a stroke length of the motor and an axial thickness of one of the magnets in the buried magnet system, and the buried magnet system is placed at a position with respect to the at least one stator such that the magnets are fully utilized, the magnets leave ends of stator teeth of the at least one stator at a same time, the buried magnet system is fully-aligned with the at least one stator, and each of magnets of the buried magnet system is at a same distance away from ends of the stator teeth of the at least one stator.