Abstract: In a conventional screw compressor, two mating rotors which resemble screws are assembled in parallel with each other within a housing. These rotors are very costly to manufacture, and it is very difficult to extract all of the gas that has been compressed between the lobes of the rotor screws. This invention eliminates the twist of the lobes around the rotor of a conventional screw compressor. In this invention, the lobes are manufactured in line with the axis of the rotor (axially). As a result, the costs of manufacturing the rotors are reduced dramatically, and the natural tendency for the gas to be driven towards the center of the female rotor is taken advantage of, making it much easier to extract practically all of the gas that has been compressed between the lobes.

Abstract: A strip of laminating steel for electric motors or generators is rolled over a mandrel in order to create an electric motor rotor or stator. The outside diameter of the mandrel determines the inside diameter of the roll, while the length of the strip determines the outside diameter of the roll. Slots for the insertion of magnet wire are either precut into the sides of the strip, or cut into the sides of the roll with metal working machinery after the roll has been wound. The slots can be created on one or both sides of the roll. Inserting magnet wire coils in these slots creates a rotor or a stator for an electric machine. A rotor surrounded by two identical stators with their stator windings facing the two rotor sides, or a stator containing slots on both sides which share one winding in its stator slots surrounded by two identical rotors comprise the main components.