Abstract: A vibrating compressor having ferrite magnets formed into arc-shaped pieces the center angle of which includes 360.degree. and disposed along the internal circumference of a cup-shaped external iron core, a cylindrical magnetic pole facing with the ferrite magnets at a predetermined gap, and an electromagnetic coil vibratably supported by a mechanical vibration system in an annular magnetic gap defined by the ferrite magnets and the cylindrical magnetic pole, wherein magnetic flux density in the annular magnetic gap is maintained uniform by at least making the axial length of the ferrite magnets larger than the length of the cylindrical magnetic pole, and the relative position of the ferrite magnets and the electromagnetic coil is selected so as to ensure the precise switching of drive current flowing through the electromagnetic coil.

Abstract: A molded submersible well motor comprises a hollow cylindrical frame 5 formed of resinous molding material into which a stator assembly having stator cores 2 and coils 3 is molded. End brackets 8 also formed of resinous molding material are detachably secured to opposite ends of the frame to close the openings thereof. A starting switch 12 for the motor is molded into the upper end bracket, together with an interconnecting terminal 9 comprising upper and lower contact posts 91, 92 for connecting the power cable 10 to the stator coils via a connector 6 and an intermediate connector 11, and a sub-receptacle 901, 930 projecting outwardly perpendicular to the main terminal 9 for connection to the starting switch.

Abstract: A motor includes two reciprocating electromagnets. The magnets are energized at positions when the total repulsive forces of the electromagnets can be applied to a single crankshaft. The electromagnets are energized when the crankshaft is 90.degree. past top dead center, in a position to provide maximum torque. One of the electromagnets is positioned by a groove follower which rides in a cam groove cut in a face of a camshaft. The camshaft is connected by a connecting linkage to the crankshaft to follow it. The cam moves the second electromagnet such that the air gap between the two electromagnets is reduced to zero when the first electromagnet is 90.degree. past top dead center.

Abstract: A hermetic dynamoelectric device includes a hollow stepped shaft. Liquid refrigerant is introduced through a pipe into the shaft, where it flashes behind the step. Rotation of the shaft separates the liquid and gas phases. The liquid phase is sprayed outwardly for cooling, and the gas phase flows around the shaft into a refrigerant plenum, where it acts upon a bearing seal to prevent leakage of lubricating oil into the refrigerant circuit.