Reciprocating electric motor compressor

Abstract From the Canadian patent

The present invention provides an electromagnetic circuit of the type in which a magnetically permeable armature is disposed to axially reciprocate within an air-gap defined by a pair of spaced-apart, coaxial poles on a fixed magnetic core, said air-gap comprising means providing a first space between said poles, said space having a circular cross section perpendicular to the axis of reciprocation of said armature and, means providing opposing pairs of exposed coplanar gap surfaces the planes of said surfaces being displaced on opposite sides of said axis of reciprocation such that the maximum displacement between said pairs of surfaces is less than the maximum diameter of said first space, …