Abstract: A squirrel-cage rotor of an asynchronous machine, in particular a die-cast rotor, includes a rotatable shaft, a laminated core being rotation-locked on the shaft and having grooves and opposing end faces. A squirrel-cage winding has rotor rods disposed in the grooves and a cage ring disposed on each of the end faces and electrically connecting the rotor rods. A pair of retaining elements is disposed on the shaft, wherein each retaining element extends in a radial direction in form of a disk or a spoke and has in an axial direction a wall and/or an axially extending finger. The wall overlaps on a radial periphery in the axial direction both the cage ring and a predefined axial section of the rotor rods that terminate in the cage ring, without increasing an external diameter of the laminated core.

Abstract: A variable speed isosychronized motor includes two annular stators conformed for variable angular alignment relative to each other and a common rotor extending a plurality of isolated loops to cross-induce power between stators once such are angularly displaced. In this form of losses, attendant to speed variation through stator phasing are reduced. Electrical compensation may be inserted between each terminal pair. Potentiometers in parallel with capacitors and may be inserted between the respective terminals to expand the operating range of the device.

Abstract: An apparatus includes a first motor and a second motor. The first motor includes a first rotor configured to provide mechanical power to a vehicle, and a first plurality of stator coils having a core and coupled to the first rotor. The second motor includes a second rotor configured to provide mechanical power to the vehicle, and a second plurality of stator coils sharing the same core as the first plurality of stator coils and coupled to the second rotor.

Abstract: Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “line current” (called the “quality” or “Q” of the tank) is (1) greater than one, (2) large enough to allow the percent efficiency of the electric motor to be equal to or greater than 95%, and (3) removes enough back emf or enough of the influence thereof so that criteria (1) and (2) can be realized throughout the entire operating range of the motor. Only one PIPRC is needed for a DC motor. Recontrolling and/or redesigning is done for two reasons.

Abstract: The present invention provides a fluid injection and recovery device capable of spraying a fluid over an object, recovering at least, the sprayed fluid, as well as filtering and recycling the recovered fluid. This fluid injection and recovery device comprises: a main tank capable of containing fluid; a filter unit capable of filtering the fluid contained in the main tank; a fluid sprayer for spraying the fluid filtered with the filter unit over an object; and a recovery unit capable of recovering, into the main tank, the fluid sprayed over the object and the matter removed by the fluid.

Abstract: An electromagnetic retarder apparatus with a built-in exciter having a retarder exciter inside thereof for generating braking torque by an eddy current produced in an eddy-current cylinder as a plurality of magnetic poles that are alternately magnetized to N and S poles by a field current caused to flow by a voltage generated in the exciter are caused to rotate in a relation to the eddy-current cylinder disposed at a location facing the magnetic poles; the eddy-current cylinder comprises a core formed by laminating a magnetic material, and short-circuiting method provided on the laminated core in the axial direction thereof for causing the generated eddy current to flow therein.

Abstract: A rotor assembly for an induction motor has cast end rings located at each axial end of a magnetically permeable core. The end rings electrically connect conductor bars extending through conductor channels in the core to provide a squirrel cage arrangement. The end rings are configured to define an annular peak along which a plurality of mounting sprews are located. Preferably, the mounting sprews are positioned between adjacent pairs of radial fan blades. The annular peak may be formed by a tapered structure which advantageously provides a narrower end ring width near the rotor's outer diameter surface. The reduced width at this location presents a higher resistance in the lock rotor condition, thus yielding an improved lock rotor specification in many cases. Due to the "deep bar effect," current will flow through the thicker portion of the end rings at higher operating speeds (i.e., lower slip frequency). As a result, a lower resistance will be realized as the motor is brought up to speed.

Abstract: A squirrel cage type electric motor rotor assembly includes first and sec end plates of circular configuration, rigid tubes extending from the first plate to the second plate, the tubes being closed at either end thereof to define enclosed chambers therein, and granules of magnetic material disposed in the chambers, the granules being packed therein with a density leaving them readily movable to align with magnetic fields.

Abstract: An induction synchronous motor includes a unitary rotor having first and second pole type rotor cores, first and second stators, a voltage phase shifting means, and DC magnetic excitation circuits. Both of the rotor cores are mounted on a common rotor axis with a predetermined space between them. The first and second rotor windings are wound on the first and second rotor cores, respectively. A plurality of diodes is each connected in parallel between series-connection nodes of the first and second rotor windings. A plurality of rotor conductors is provided on the peripheries of and extend through the first and second rotor cores. A pair of short-circuit rings short-circuits both ends of the plurality of rotor conductors. The first and second stators surround the first and second salient pole type rotor cores, respectively, and have the same number of poles as the first and second rotor cores. The voltage phase shifting means selectively produces a phase difference of 0.degree.

Abstract: A two-stator induction synchronous motor includes a unitary rotor having a first rotor assembly and a second rotor assembly each of which is formed by a permanent magnet and a rotor core. The first rotor assembly and the second rotor assembly respectively have a first pair of and a second pair of magnetic poles of the permanent magnets disposed in such a relative relation that the former and the latter are displaced by 180.degree. or 0.degree. with each other. The motor also includes a phase shifting means which produces a phase difference of 0.degree. or 180.degree. between a voltage induced in rotor conductive members by a rotating magnetic field generated around the first rotor assembly and a voltage induced in rotor conductive members by a rotating magnetic field generated around the second rotor assembly.