Abstract: The present invention relates to a resonant piston compressor in which a double-sided piston reciprocates within a cylinder and defines a valved compression space on one side of the piston and a balance chamber on its other side. The invention further includes a movable head adjustable between first and second positions to effect a large change in the total volume of the balance chamber between the two positions. In one position, of the movable head an extended balance chamber volume is coupled to the balanced chamber while in the other position of the movable head, the extended balance chamber volume is decoupled from the balance chamber.

Abstract: An electrodynamic motor having a flat plunger core arrangement formed out of alternating layers of magnetic and insulating strips clamped together and maintained on respective bearing sleeves which reciprocate on guide members with the gap between stator members.

Abstract: A linear air compressor having a linear electrodynamic motor which is air cooled and has an increased stroke and accordingly increased output. The working piston is provided with and stroke parting on a push-pull spring provides for centering of the plunger of the motor.

Abstract: A method of making a laminated stator assembly for a dynamoelectric machine which comprises machining an inner stator member as a single detail having a plurality of winding retaining grooves and plurality of radial slots all of which terminate at or near a central core portion of the stator member. The material between the radial slots form spaced apart radially tapered sections which terminate in the central core portion and the stator member can serve as its own winding mandrel for winding coils in place in the grooves. After such winding an outer shell of magnetic material is fitted over the inner stator member. The coils, spaces between the radially tapered sections, and surfaces of the groove are provided with suitable, electrically insulating bonding material which after curing bonds such elements into a single unit. The central core portion is then machined away so that there is longer a direct connection between the interior ends of the tapered sections and the stator member.

Abstract: A generally cylindrical armature for a linear motor includes an outer diameter region of involute laminate construction. Restricting the laminate assembly to an outer diameter region of the armature, which region constitutes a high magnetic flux density region, minimizes an arc of involute .alpha.. Minimizing the arc of involute .alpha. approximates more closely a true radial disposition of the involute laminations, thereby increasing the ability of the laminations to reduce eddy current losses, therein providing the basis for a more efficient linear motor.

Abstract: A linear electric motor has an inner armature which is adapted to reciprocate axially and an outer stator which includes a plurality of axially extending laminations which have inner edges engaging each other and defining a cylindrical bore in which the armature is situated. These laminations respectively have axially extending outer edge regions which are oppositely inclined one with respect to the next with each lamination having an outer edge pressing against an outer edge of the next lamination and spaced from the outer edge of the preceding lamination, so that the outer edge regions of the laminations define between themselves axially extending spaces which alternately converge and diverge radially inwardly toward the common axis of the armature and stator.